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Micro-CT characterization and fractal study on the fracture structure of coal under the liquid nitrogen cold soaking 认领 引用
1
作者 LIU Shu-min WANG Shuai-lin +4 位作者 LI Xue-long SUN Hai-tao WAN Ni ZHANG Dong-ming WANG Deng-ke 《Journal of Central South University》 SCIE EI CAS CSCD 2026年第4期1815-1837,共23页
The development of coalbed methane in China is constrained by complex geological conditions characterized by low permeability,low saturation,low reservoir pressure,and high adsorption("three lows and one high&quo... The development of coalbed methane in China is constrained by complex geological conditions characterized by low permeability,low saturation,low reservoir pressure,and high adsorption("three lows and one high"),posing significant challenges to its efficient development.The liquid nitrogen-induced fracturing and permeability enhancement technology can effectively promote the expansion and connection of macroscopic and microscopic fractures,thereby improving the permeability of coal seams.In this study,industrial micro-CT scanning technology,the VRA-UNet method,and fractal dimension calculation methods are employed to conduct an in-depth analysis of the action mechanism of liquid nitrogen cold soaking on the fracture structure of coal bodies with different metamorphism degrees.The results indicate that liquid nitrogen cold soaking promotes the generation,expansion,and connection of new fractures inside coal bodies to form fracture networks.Via Matlab programming and VG Studio MAX image analysis software,fracture extraction and calculation are performed on CT-scanned coal samples;it is statistically found that the quantitative fracture indices of coal increase after liquid nitrogen cold soaking.Compared with the fracture spectrum peak proportions of raw coal samples,the fracture spectrum peak proportions of anthracite,bituminous coal,and lignite increase by 8.375%,12.680%,and 79.939%,respectively after liquid nitrogen cold soaking.By combining the VRA UNet method for coal fracture identification,the box-counting method is used to calculate that the fractal dimension of coal fractures after liquid nitrogen cold soaking is larger than that of raw coal samples.The research findings of this paper will provide theoretical and technical support for the efficient development of coalbed methane and the improvement of coal seam gas extraction rates. 展开更多
关键词 liquid nitrogen cold soaking crack morphology micro-CT fractal measurement
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Quantitative calibration method for the evolution of mechanical properties of gas-containing coal under mining-induced stress and microscopic failure evaluation 认领 引用
2
作者 Zeqi Wang Liang Yuan +2 位作者 Bin Hu Bo Li Laisheng Huang 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2026年第3期475-497,共23页
Current quantitative characterization methods for the mechanical response and damage evolution of coal seams at different burial depths under mining-induced stress remains insufficient.To address this,this study estab... Current quantitative characterization methods for the mechanical response and damage evolution of coal seams at different burial depths under mining-induced stress remains insufficient.To address this,this study establishes a quantitative characterization model for the evolution of mechanical properties in gas-bearing coal masses at varying burial depths.It innovatively introduces a dual damage quantification technique and develops a coupled damage evolution model that comprehensively considers energy evolution,effective mining-induced stress,permeability,and a damage sensitivity coefficient,followed by extensive analysis.Key findings include:coal damage exhibits heterogeneous evolutionary characteristics under mining-induced stress;based on the theory of irreversible deformation,the proposed damage characterization equation can effectively determine the critical damage threshold of coal;the three-parameter EXP function model is more suitable for characterizing the time-dependent damage process of coal under mining-induced stress;a new characterization method for the coal brittleness evaluation index is proposed,revealing an 800 m burial depth boundary for the coal brittleness index;at the microscopic level,achieving quantitative characterization of the correlation between peak stress and the average reduction in functional groups during mining-induced failure of coal at different burial depths.Finally,the mapping relationship between laboratory experimental parameters and field monitoring indicators for early warning of coal mine dynamic disasters is established. 展开更多
关键词 Mining-induced stress Coupled damage Quantitative characterization Energy evolution
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Life cycle dynamic formation temperature response and thermal energy extraction of mine geothermal system considering groundwater flow 认领 引用 被引量：8
3
作者 Xibing Li Zhiying Chen +4 位作者 Linqi Huang Botao Li Jingyi Yan Peilei Zhang Zhixiang Liu 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2025年第1期1-17,共17页
As mining activities expand deeper,deep high-temperature formations seriously threaten the future safe exploitation,while deep geothermal energy has great potential for development.Combining the formation cooling and ... As mining activities expand deeper,deep high-temperature formations seriously threaten the future safe exploitation,while deep geothermal energy has great potential for development.Combining the formation cooling and geothermal mining in mines to establish a thermos-hydraulic coupling numerical model for fractured formation.The study investigates the formation heat transfer behaviour,heat recovery performance and thermal economic benefits influenced during the life cycle.The results show that the accumulation of cold energy during the cold storage phase induces a decline in formation temperature.The heat recovery phase is determined by the extent of the initial cold domain,which contracts inward from the edge and decelerates the heat recovery rate gradually.With groundwater velocity increases,the thermal regulation efficiency gradually increases,the production temperature decreases,while the effective radius and thermal power increase first and then decrease.The injected volume and temperature significantly affect,with higher injection temperatures slowing thermal recovery,and the thermal regulation efficiency is more sensitive to changes in formation permeability and thermal conductivity.The heat extraction performance is positively correlated with all factors.The levelized cost of electricity is estimated at 0.1203$/(kW·h)during the cold storage.During the heat recovery,annual profit is primarily driven by cooling benefits. 展开更多
关键词 Mine geothermal energy Formation heat transfer behavior Groundwater flow Life cycle assessment Thermal economic analysis
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Hydraulic fracture propagation in soft coal composite reservoirs:Mechanical responses and energy dissipation mechanisms 认领 引用 被引量：4
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作者 Aitao Zhou Yizheng He +3 位作者 Kai Wang Bo Li Yida Wang Yuexin Yang 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2025年第4期573-588,共16页
The hydraulic fractures induced in soft coal composite reservoirs have complex extension and energy evolution characteristics.In this study,the mechanism whereby gas outbursts can be eliminated by hydraulic fracturing... The hydraulic fractures induced in soft coal composite reservoirs have complex extension and energy evolution characteristics.In this study,the mechanism whereby gas outbursts can be eliminated by hydraulic fracturing was revealed.The combined fracturing process of a coal seam and its roof under different in situ stress and fracture spacing conditions was analysed through true triaxial physical tests and numerical simulations.The results showed that the pre-fracturing of the roof had a pressure relief effect on the coal seam,and the secondary pressure relief of the coal seam could be completed at a lower fracture initiation pressure.To ensure the continued presence of the stress shadow effect in actual projects,the fracture spacing should be maintained within the critical range influencing the fracture extension.If the vertical stress is high,a call on increasing the fracture spacing can be taken;otherwise,it must be reduced.In the early phase of fracturing,energy is mostly concentrated at the tip and surface of the fracture;however,the proportion of surface energy for subsequent fracturing is gradually reduced,and the energy is mostly used to open the formation and work on the surrounding matrix.Hydraulic fracturing creates new fractures to interconnect originally heterogeneously distributed gas zones,enabling the entire coal seam to first establish interconnected pressure equilibration,then undergo gradientcontrolled depressurization.Hydraulic fracturing can homogenize the stress field and gas pressure field in the original coal seam via communication pressure equalization and reduction decompression,reduce the elastic and extension energies,increase the minimum failure energy required for instability;and realize the elimination of gas outbursts.Our findings provide some theoretical support for the efficient development of coalbed methane and the prevention and control of dynamic gas disasters in coal mines. 展开更多
关键词 Coal-rock complex Soft coal seams Hydraulic fracturing Energy evolution Eliminating gas outburst
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Investigation on coal damage and fracture extension law of liquid nitrogen injection pre-cooling and fracturing under true triaxial stress 认领 引用 被引量：4
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作者 Botao Li Haifei Lin +7 位作者 Jianping Wei Hongtu Zhang Shugang Li Zongyong Wei Lei Qin Pei Wang Rongwei Luo Zeran Liu 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2025年第2期213-229,共17页
To more accurately describe the coal damage and fracture evolution law during liquid nitrogen(LN2)fracturing under true triaxial stress,a thermal-hydraulic-mechanical-damage(THMD)coupling model for LN2 fracturin... To more accurately describe the coal damage and fracture evolution law during liquid nitrogen(LN2)fracturing under true triaxial stress,a thermal-hydraulic-mechanical-damage(THMD)coupling model for LN2 fracturing coal was developed,considering the coal heterogeneity and thermophysical parameters of nitrogen.The accuracy and applicability of model were verified by comparing with LN2 injection pre-cooling and fracturing experimental data.The effects of different pre-cooling times and horizontal stress ratios on coal damage evolution,permeability,temperature distribution,and fracture characteristics were analyzed.The results show that the permeability and damage of the coal increase exponentially,while the temperature decreases exponentially during the fracturing process.As the pre-cooling time increases,the damage range of the coal expands,and the fracture propagation becomes more pronounced.The initiation pressure and rupture pressure decrease and tend to stabilize with longer precooling times.As the horizontal stress ratio increases,fractures preferentially extend along the direction of maximum horizontal principal stress,leading to a significant decrease in both initiation and rupture pressures.At a horizontal stress ratio of 3,the initiation pressure drops by 48.07%,and the rupture pressure decreases by 41.36%.The results provide a theoretical basis for optimizing LN2 fracturing techniques and improving coal seam modification. 展开更多
关键词 Liquid nitrogen fracturing Thermal–hydraulic-mechanical-damage coupling Heterogeneous coal True triaxial stress Fracture morphology
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Evolution law of pulsating seepage and thermal deformation by injecting high-temperature steam into coal for thermal coalbed methane recovery 认领 引用
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作者 Zhiqiang Li Junliang Li +7 位作者 Jinsheng Chen Ali Karrech Ningchao Zhang Ju Chang Kaiqi Jin Yangyang Yu Hongbin Wang Aijie Wang 《Deep Underground Science and Engineering》 EI CAS CSCD 2025年第1期119-131,共13页
Chinese coal reservoirs are characterized by low pressure and low permeability,which need to be enhanced so as to increase production.However,conventional methods for permeability enhancement can only increase the per... Chinese coal reservoirs are characterized by low pressure and low permeability,which need to be enhanced so as to increase production.However,conventional methods for permeability enhancement can only increase the permeability in fractures,but not the ultra-low permeability in coal matrices.Attempts to enhance such impermeable structures lead to rapid attenuation of gas production,especially in the late stage of gas extraction.Thermal stimulation by injecting high-temperature steam is a promising method to increase gas production.The critical scientific challenges that still hinder its widespread application are related to the evolution law of permeability of high-temperature steam in coal and the thermal deformation of coal.In this study,an experimental approach is developed to explore the high-temperature steam seepage coupled with the thermal deformation in coal under triaxial stress.The tests were conducted using cylindrical coal specimens of?50 mm×100 mm.The permeability and thermal strain in coal were investigated when high-temperature steam was injected at151.11,183.20,213.65,and 239.76°C.The experimental results reveal for the first time that as the amount of injected fluid increases,the steam permeability shows periodic pulsation changes.This paper introduces and explains the main traits of this discovery that may shed more light on the seepage phenomenon.When the injected steam temperature increases,the amplitude of pulsating permeability decreases,whereas the frequency increases;meanwhile,the period becomes shorter,the pulsation peak appears earlier,and the stabilization time becomes longer.The average peak permeability shows a“U-shaped”trend,decreasing first and then increasing as the steam temperature increases.Meanwhile,with the extension of steam injection time,the axial,radial,and volumetric strains of coal show a stage-wise expansion characteristic at different temperatures of steam injection,except for the radial strains at 151.11°C.A two-phase flow theory of gas–liquid is adopted to elucidate the mechanism of pulsating seepage of steam.Moreover,the influencing mechanism of inward and outward thermal expansion on the permeability of coal is interpreted.The results presented in this paper provide new insight into the feasibility of thermal gas recovery by steam injection. 展开更多
关键词 coalbed methane permeability pulsation steam thermal deformation two-phase flow
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Hotspots,trends,and regional focus on oil or gas exploration:A bibliometric comparative study 认领 引用
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作者 Jihong Wang Zhongkai Li +1 位作者 Jianguo Wang Zhiqiang Li 《Deep Underground Science and Engineering》 EI CAS CSCD 2026年第1期296-311,共16页
Oil and gas resources serve as the driving force for economic and social development.This rapid development of science and technology has accelerated the exploration,development,and utilization of oil and gas resource... Oil and gas resources serve as the driving force for economic and social development.This rapid development of science and technology has accelerated the exploration,development,and utilization of oil and gas resources,and thus led to spurts in related research.However,the research trends in global oil and gas exploration vary with the progress of science and technology as well as social demands.Accordingly,they are not easily captured.This study explores the research trends in global oil and gas exploration through the bibliometric analysis of 3460 articles on oil and gas exploration collected from the Web of Science database and published from 2013 to 2023.The research hotspots,objects,regional distribution,methods,and evaluation methods in oil and gas exploration are analyzed,and the direction of development of oil and gas exploration is presented on this basis.The research characteristics of four major countries or regions related to oil and gas exploration were further investigated and compared.The results show that the number of publications on oil and gas exploration research has been continuously increasing in the past decade,with China ranking the top in terms of publications.Given the continuously evolving global energy demand,exploration of unconventional oil and gas,application of digital technology,deep and emerging regional resource exploration,and environmentally friendly and low-carbon source exploration will be future research hotspots. 展开更多
关键词 bibliometric analysis oil or gas exploration resources shale gas unconventional energy
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GA-SVC model and application of comprehensive evaluation of coal mine essential safety management 认领 引用
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作者 Zhi-Jun WANG Rui-Lin ZHANG Wen-Ting SONG 《Journal of Coal Science & Engineering(China)》 2013年第2期226-230,共5页
In order to evaluate the level of the coal mine essential safety management, the comprehensive index system was designed base on the connotation principle of the mine essential safety management. Due to the disadvanta... In order to evaluate the level of the coal mine essential safety management, the comprehensive index system was designed base on the connotation principle of the mine essential safety management. Due to the disadvantage of index weight setting by subjective idea in the former method, support vector classification algorithm was used to assess the level of coal mine essential safety management. According to the advantages of the global search capability of the genetic algorithm, support vector classification parameters optimization method was proposed based on genetic algorithm, and genetic algorithm-support vector classification model of coal mine essential safety management assessment was established. Learning samples were constructed on the basis of former data of mine essential safety management evaluation. The test results show that the genetic algorithm-support vector classification model has higher evaluation accuracy and good generalization ability, and the advantage of no need for artificial setting of index weight and absence of the subjective factors influence to evaluation results. 展开更多
关键词 mine safety essential safety management comprehensive assessment support vector classification genetic algorithm
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Coal and gas outburst mechanism of the “Three Soft” coal seam in western Henan 认领 引用 被引量：14
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作者 LEI DongJi LI Chengwu +1 位作者 ZHANG Zimin ZHANG Yugui 《Mining Science and Technology》 2010年第5期712-717,共6页
Based on the particularities of gas outbursts,i.e.,low gas bearing capacity and low gas pressure in the "Three Soft" coal seam in western Henan,we applied the theories of plate tectonics and regional structu... Based on the particularities of gas outbursts,i.e.,low gas bearing capacity and low gas pressure in the "Three Soft" coal seam in western Henan,we applied the theories of plate tectonics and regional structural evolution to investigate the mechanism of this seam and its impact on the coal seam gas formation.Our investigation revealed that coal and gas outbursts are distributed in a strip in a NW direction,with a number of high-penetration mines scattered towards the south side and low-gas mines largely located on the north side.We analyzed the statistics of 38 gas explosions and the rock-coal sturdiness number coefficient f of 167 sampling sites in the region and found the gas outburst mechanism that features a "low indicator outburst phenomenon".The mechanism is characterized by structural coal as its core,a low gas bearing capacity,low gas pressure and sturdiness coefficient f mostly less than 0.3.Our research results provide a theoretical foundation for effective control of gas disasters. 展开更多
关键词 coal and gas outburst mechanism investigation threshold sliding structure
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Constitutive model for methane desorption and diffusion based on pore structure differences between soft and hard coal 认领 引用 被引量：9
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作者 Liu Yanwei Wang Dandan +2 位作者 Hao Fuchang Liu Mingju Mitri Hani S. 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2017年第6期937-944,共8页
This paper aims to improve the accuracy and applicability of gas diffusion mathematical models from coal particles. Firstly, a new constitutive model for gas diffusion from coal particles with tri-disperse pore struct... This paper aims to improve the accuracy and applicability of gas diffusion mathematical models from coal particles. Firstly, a new constitutive model for gas diffusion from coal particles with tri-disperse pore structure is constructed by considering the difference in characteristics between soft coal and hard coal.The analytical solution is then derived, that is, the quantitative relationship between gas diffusion rate(Qt/Q_∞) and diffusion time(t), The pore structure parameters of soft coal and hard coal from Juji coal mine are determined. Gas diffusion rules are numerically calculated and investigated by physical simulation methods. Lastly, the applicability of this model is verified. The results show that the homogeneous model only applies to the gas diffusion process of hard coal during the initial 10 min. The calculation results from this model and the physical experimental results of soft coal and hard coal are nearly identical during the initial 30 min. 展开更多
关键词 Soft and hard coal Gas diffusion Pore structure Constitutive models Physical simulation
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Effect of protective coal seam mining and gas extraction on gas transport in a coal seam 认领 引用 被引量：14
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作者 Yao Banghua Ma Qingqing +2 位作者 Wei Jianping Ma Jianhong Cai Donglin 《International Journal of Mining Science and Technology》 EI CAS CSCD 2016年第4期637-643,共7页
A gas–solid coupling model involving coal seam deformation,gas diffusion and seepage,gas adsorption and desorption was built to study the gas transport rule under the effect of protective coal seam mining.The researc... A gas–solid coupling model involving coal seam deformation,gas diffusion and seepage,gas adsorption and desorption was built to study the gas transport rule under the effect of protective coal seam mining.The research results indicate:(1)The depressurization effect changes the stress state of an overlying coal seam and causes its permeability to increase,thus gas in the protected coal seam will be desorbed and transported under the effect of a gas pressure gradient,which will cause a decrease in gas pressure.(2)Gas pressure can be further decreased by setting out gas extraction boreholes in the overlying coal seam,which can effectively reduce the coal and gas outburst risk.The research is of important engineering significance for studying the gas transport rule in protected coal seam and providing important reference for controlling coal and gas outbursts in deep mining in China. 展开更多
关键词 Protective coal seam mining Seepage characteristic Coal and gas outburst Numerical simulation
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Rockburst mechanism and the law of energy accumulation and release in mining roadway: a case study 认领 引用 被引量：10
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作者 Feng Du Ji Ma +5 位作者 Xiaofei Guo Tianfeng Wang Xiaohang Dong Jiashuo Li Shulei He Dilinaer Nuerjuma 《International Journal of Coal Science & Technology》 EI CAS CSCD 2022年第5期96-112,共17页
The rockburst dynamic disasters in the process of deep coal mining become more and more serious.Taking the rockburst occurred in the 23130 working face of Yuejin Coal Mine as the engineering background,we study the ch... The rockburst dynamic disasters in the process of deep coal mining become more and more serious.Taking the rockburst occurred in the 23130 working face of Yuejin Coal Mine as the engineering background,we study the characteristics of mining stress feld around roadway,the plastic failure morphological characteristics of surrounding rock and the accumulationelease law of elastic energy before and after burst.An analysis model quantitatively describing the physical process of rockburst in the mining roadway is established,and the calculation method of dynamic release of elastic energy in the physical process of rockburst is educed.The mechanism of rockburst in mining roadway is revealed.The results show that an“L-shaped”stress concentration zone is formed within 100 m of the 23130 working face,and the principal stress ratio of the surrounding rock of the transportation roadway is 2.59–4.26.The change of the direction of the maximum principal stress has a signifcant efect on the burst appearance characteristics.The failure strength of diferent sections of the mining roadway is characterized by the elastic energy release value.With the increase of the working face distance,the elastic energy released by burst failure and the expansion variation of failure boundary radius show a nonlinear variation law that tends to decrease steadily after sharp fuctuation.The closer to the working face,the higher the burst risk.At a distance of 10 m from the working surface,the maximum principal stress reaches its maximum value.The butterfy-shaped failure system generated by the surrounding rock of the roadway has energy self-sustainability,and the elastic energy released by the sudden expansion of the butterfy leaf is enough to cause a burst damage of 1.9 magnitude.This work could provide theoretical support for the prediction and prevention of rockburst. 展开更多
关键词 Coal Rockburst Mining roadway Plastic failure Dynamic and static load Elastic energy
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Risk assessment of gas control and spontaneous combustion of coal under gas drainage of an upper tunnel 认领 引用 被引量：14
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作者 Tingxiang Chu Pin Li Yuexia Chen 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2019年第3期491-498,共8页
The adjustment of the gas drainage rate has an immediate impact on air leakage in gob,thus resulting in the change of self-heating of coal.While regulating the gas drainage parameters,the risk of spontaneous combustio... The adjustment of the gas drainage rate has an immediate impact on air leakage in gob,thus resulting in the change of self-heating of coal.While regulating the gas drainage parameters,the risk of spontaneous combustion of coal should be considered.The risk assessment of gas control and spontaneous combustion of coal under gas drainage in a tunnel was investigated at different gas drainage rates.The distributions of the air volume along the working face,the gas management effects and the width of the oxidation zone were subjected to risk analysis.As the simulation results showed,with increasing gas drainage rate,although the safety of gas dilution by ventilation was assured,the intensifying air leakage caused the oxidation zone to move into the deeper gob and led to an increase in the width of the oxidation zone.A risk assessment method was proposed to determine a suitable gas drainage rate for the upper tunnel.The correctness of the risk assessment and the validity of the numerical modelling were confirmed by the field measurements. 展开更多
关键词 Gas drainage Risk assessment Air leakage Oxidation zone Spontaneous combustion
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Seepage law and permeability calculation of coal gas based on Klinkenberg effect 认领 引用 被引量：7
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作者 王登科 魏建平 +2 位作者 付启超 刘勇 夏玉玲 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第5期1973-1978,共6页
Focused on the Klinkenberg effect on gas seepage, the independently developed triaxial experimental system of gas seepage was applied to conduct research on the seepage characteristics of coal seam gas. By means of ex... Focused on the Klinkenberg effect on gas seepage, the independently developed triaxial experimental system of gas seepage was applied to conduct research on the seepage characteristics of coal seam gas. By means of experimental data analysis and theoretical derivation, a calculation method of coal seam gas permeability was proposed, which synthesized the respective influences of gas dynamic viscosity, compressibility factor and Klinkenberg effect. The study results show that the Klinkenberg effect has a significant influence on the coal seam gas seepage, the permeability estimated with the method considering the Klinkenberg effect is correct, and this permeability can fully reflect the true seepage state of the gas. For the gas around the standard conditions, the influences of dynamic viscosity and compressibility factor on the permeability may be ignored. For the gas deviating far away from the standard conditions, the influences of dynamic viscosity and compressibility factor on the permeability must be considered. The research results have certain guiding significance in forming a correct understanding of the Klinkenberg effect and selecting a more accurate calculation method for the permeability of coal containing gas. 展开更多
关键词 coalbed gas seepage law Klinkenberg effect gas adsorption-desorption permeability
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A rapid and accurate direct measurement method of underground coal seam gas content based on dynamic diffusion theory 认领 引用 被引量：8
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作者 Yanwei Liu Yang Du +4 位作者 Zhiqiang Li Fajun Zhao Weiqin Zuo Jianping Wei Hani Mitri 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2020年第6期799-810,共12页
Coal seam gas content is frequently measured in quantity during underground coal mining operation and coalbed methane(CBM)exploration as a significant basic parameter.Due to the calculation error of lost gas and resid... Coal seam gas content is frequently measured in quantity during underground coal mining operation and coalbed methane(CBM)exploration as a significant basic parameter.Due to the calculation error of lost gas and residual gas in the direct method,the efficiency and accuracy of the current methods are not inadequate to the large area multi-point measurement of coal seam gas content.This paper firstly deduces a simplified theoretical dynamic model for calculating lost gas based on gas dynamic diffusion theory.Secondly,the effects of various factors on gas dynamic diffusion from coal particle are experimentally studied.And sampling procedure of representative coal particle is improved.Thirdly,a new estimation method of residual gas content based on excess adsorption and competitive adsorption theory is proposed.The results showed that the maximum error of calculating the losing gas content by using the new simplified model is only 4%.Considering the influence of particle size on gas diffusion law,the particle size of the collected coal sample is below 0.25 mm,which improves the measurement speed and reflects the safety representativeness of the sample.The determination time of gas content reduced from 36 to 3 h/piece.Moreover,the absolute error is 0.15–0.50 m^3,and the relative error is within 5%.A new engineering method for determining the coal seam gas content is developed according to the above research. 展开更多
关键词 Coal seam gas content Dynamic diffusion model Determination method Lost gas content Desorption characteristics
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Mechanism study of organic antioxidant and inorganic salt on suppressing coal oxidation 认领 引用 被引量：5
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作者 于水军 余明高 +1 位作者 贾海林 左秋玲 《Journal of Coal Science & Engineering(China)》 2007年第1期65-68,共4页
The advantages and disadvantages of organic antioxidant and inorganic salt on suppressing coal oxidation were analyzed on the basis of the theory that coal oxidation mechanisms can be attributed to the free radical ch... The advantages and disadvantages of organic antioxidant and inorganic salt on suppressing coal oxidation were analyzed on the basis of the theory that coal oxidation mechanisms can be attributed to the free radical chain-type reaction mechanism. The inhibition curves on suppressing coal oxidation of the different type and different concentration of organic antioxidant and inorganic salt were given through experimental study and data processing. Then some conclusions can be gained from the experimental study combining with theoretical analysis. First the inhibition mechanism of the organic antioxidant and inorganic salt is different. The former is that the chemical action is the dominant position. It can be called as the chain termination theory because the free radical is captured during coal oxidation. And the later is that the physical effect is the dominant position. It can be called as the decreasing-temperature theory because the liquid membrane which was formed by the inorganic salt can make coal body be the state of wetness and prevent oxygen from coal surface. Second the inhibition effect of the organic antioxidant is higher than the inorganic salt in the later period. But it is lower in the early period. 展开更多
关键词 coal oxidation organic antioxidant inorganic salt inhibition mechanism
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Study on the propagation law of shock wave resulting from coal and gas outburst 认领 引用 被引量：2
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作者 WANG Kai ZHOU Ai-tao +2 位作者 ZHANG Pin LI Chuan GUO Yan-wei 《Journal of Coal Science & Engineering(China)》 2011年第2期142-146,共5页
According to the formation of shock wave resulting from coal and gas outburst, the gas flow of coal and gas outburst was transformed from an unsteady flow to a steady one based on selected appropriate reference coordi... According to the formation of shock wave resulting from coal and gas outburst, the gas flow of coal and gas outburst was transformed from an unsteady flow to a steady one based on selected appropriate reference coordinates, and the mathematical expressions were then established by applying mass conservation, momentum conservation equation, and energy conservation equation. On this basis, analyzed gas flow mitigation of variable cross-section area and the outburst intensity, and the relations between cross-section area, velocity, and density; the relations between overpressures and outburst intensity were deduced. Furthermore, shock waves resulting from coal and gas outburst and outburst intensity were measured by experimental setup, the overpressure and outburst intensity of different gas pressures were obtained, and the similar conditions of the experiment were numerically simulated. The averaged overpressure and gas flow velocity of variable cross-section under different gas pressures were numerically derived. The results show that the averaged overpressure and outburst intensity obtained from simulation are in good agreement with the experimental results. Moreover, the gas flow velocity of variable cross-sections approximates to the theoretical analysis. 展开更多
关键词 coal and gas outburst shock wave overpressure gas flow velocity outburst intensity
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Development and Application of Nested PCR Assay for Detection of Dairy Cattle-Derived Cyclospora sp. 认领 引用 被引量：2
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作者 XIAO Shu-min LI Guo-qing +2 位作者 LI Wei-hua ZHOU Rong-qiong YANG Jian-wei 《Agricultural Sciences in China》 2007年第12期1511-1516,共6页
To develop a nested PCR assay for the detection of cattle-derived Cyclospora sp., two pairs of primers were designed on the basis of the cattle-derived Cyclospora sp. sequences. These primers selectively amplified a 1... To develop a nested PCR assay for the detection of cattle-derived Cyclospora sp., two pairs of primers were designed on the basis of the cattle-derived Cyclospora sp. sequences. These primers selectively amplified a 168-bp DNA fragment of the 18S rRNA gene of cattle-derived Cyclospora sp. With these primers, a nested PCR assay for the detection of cattlederived Cyclospora sp. was developed. The nested PCR assay was specific and there is no cross-reaction with other parasites, such as Eimeria spp., Cryptosporidium spp., Giardia sp., Toxoplasma sp., Trichuris sp. and cattle ciliate. The assay was able to detect as low as 2.85 × 10^-2 fg of the control positive DNA. The results of the detection of clinical samples indicated that the assay coincided with microscopic examination. The results show that the nested PCR assay will be an effective tool for the detection of Cyclospora sp. in cattle feces. 展开更多
关键词 Cyclospora sp. dairy cattle nested PCR detection
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Numerical Simulation Study of Goaf Methane Drainage and Spontaneous Combustion Coupling 认领 引用 被引量：17
19
作者 LI Zong-xiang LU Zhong-liang +1 位作者 WU Qiang ZHANG Ai-ran 《Journal of China University of Mining and Technology》 2007年第4期503-507,共5页
In order to study the coupling problem between methane drainage and spontaneous combustion of residual coal in the collapsed zone after mining ignitable coal seams with high methane,we have analyzed the effects of dif... In order to study the coupling problem between methane drainage and spontaneous combustion of residual coal in the collapsed zone after mining ignitable coal seams with high methane,we have analyzed the effects of differ-ent methane drainage modes on spontaneous combustion of residual coal through numerical simulation. The results show that deep and large flux methane drainage modes increases the air leakage from work faces to the goaf and formed new spontaneous combustion zones induced by drainage near vents,which increases the risk of self-ignition of coal—reducing the self-ignition period and enlarging the scale of self-ignition. The spontaneous upstream combustion oxidation of the main fire zone can be suppressed when both drainage and nitrogen injection were adopted. Our research results provide an effective technical measure and theoretical basis to determine the best methane drainage scheme and drainage parameters. 展开更多
关键词 goal methane drainage spontaneous combustion multiphase gas flow field finite element
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Discussion of the indexes of nonoutburst coal seam upgrade and its corresponding critical values 认领 引用 被引量：1
20
作者 WEI Jian-ping LIU Yan-wei +1 位作者 LIU Ming-ju MENG Lei 《Journal of Coal Science & Engineering(China)》 2009年第4期382-388,共7页
In view of the measurement difficulties of indexes recommended by the 50Items Experience of Coal Mine Gas Prevention in the process of the nonoutburst coalseam upgrade, this paper took the No.8 coal seam of Huainan Mi... In view of the measurement difficulties of indexes recommended by the 50Items Experience of Coal Mine Gas Prevention in the process of the nonoutburst coalseam upgrade, this paper took the No.8 coal seam of Huainan Mining Group as research object. Discussed the suitability of indexes and corresponding critical values, putforward method in determining the indexes and its critical values by analysis and investigation of the gas geological condition and the-spot tracking near position where anoutburst occurred combined with laboratory experiment, and established the indexesand its critical values of nonoutburst coal seam upgrade in No.8 coal seam of HuainanMining Group. The results show that it is suitable to take gas content and tectonic softcoal thickness easily to gain in routine production as primary upgrade indexes that itscritical values are 7.5 m^3 and 0.8 m, respectively. In addition, takefvalue and Ap valueas auxiliary indexes. 展开更多
关键词 nonoutburst coal seam upgrade methods and indexes system gas geology tectonic soft coal thickness gas content
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