为探讨沥青道路反射裂缝疲劳扩展对邻近裂纹的影响,本文基于ABAQUS软件构建了含多个初始裂纹的道路结构二维模型,借助软件中的扩展有限元法(extended finite element method,XFEM)对模型施加车辆-温缩耦合荷载,分析在不同长度、不同间...为探讨沥青道路反射裂缝疲劳扩展对邻近裂纹的影响,本文基于ABAQUS软件构建了含多个初始裂纹的道路结构二维模型,借助软件中的扩展有限元法(extended finite element method,XFEM)对模型施加车辆-温缩耦合荷载,分析在不同长度、不同间距下裂纹在疲劳扩展过程中的动态响应,同时探讨车辆荷载在耦合荷载中的作用.结果表明:道路中预设裂纹长度越长,与疲劳扩展裂缝的间距越小,疲劳扩展对裂纹开裂的促进作用越显著;车辆荷载促进疲劳裂缝的扩展,并促使裂缝的动态疲劳开裂模式由张开型向剪切型转变.展开更多
The identification of rock mass hazard sources is fundamental for preventing rockfall and landslide disasters in mountainous regions,with rock mass structural characteristics playing a vital role in hazard assessment....The identification of rock mass hazard sources is fundamental for preventing rockfall and landslide disasters in mountainous regions,with rock mass structural characteristics playing a vital role in hazard assessment.In this study,terrestrial laser scanning(TLS)and unmanned aerial vehicle(UAV)technologies were integrated to enhance the evaluation methodology for rock mass hazard sources,focusing on the Sichuan Yanjiang Expressway project in China.The findings demonstrate that TLS-UAV technology enhanced both spatial coverage and data density in slope modeling.Through integrated algorithmic analysis,rock discontinuities within heterogeneous datasets were systematically identified,enabling quantitative extraction and statistical analysis of key geometric parameters,including orientation,trace length,spacing,and roughness.Furthermore,quantitative models were developed for cohesion,friction angle and the morphology parameter M of in situ discontinuities,respectively,facilitating efficient mechanical parameter acquisition.A novel rock mass hazard index(RHI)was developed incorporating discontinuity geometric rating(DGR),discontinuity mechanical rating(DMR),and slope mass rating(SMR).Field validation confirmed the methodology's effectiveness in evaluating risk levels and spatial heterogeneity of rock mass hazard sources,revealing the contribution of different discontinuity sets to the rock mass hazard and identifying the primary discontinuity sets controlling instability mechanisms.This study is of great significance for evaluating discontinuity-controlled rock mass hazard sources and preventing rockfall disasters.展开更多
摘要为探讨沥青道路反射裂缝疲劳扩展对邻近裂纹的影响,本文基于ABAQUS软件构建了含多个初始裂纹的道路结构二维模型,借助软件中的扩展有限元法(extended finite element method,XFEM)对模型施加车辆-温缩耦合荷载,分析在不同长度、不同间距下裂纹在疲劳扩展过程中的动态响应,同时探讨车辆荷载在耦合荷载中的作用.结果表明:道路中预设裂纹长度越长,与疲劳扩展裂缝的间距越小,疲劳扩展对裂纹开裂的促进作用越显著;车辆荷载促进疲劳裂缝的扩展,并促使裂缝的动态疲劳开裂模式由张开型向剪切型转变.
基金support from the National Natural Science Foundation of China(Grant Nos.42177142 and 52378477)the Key Research and Development Program of Shaanxi(Grant No.2023-YBSF-486).
摘要The identification of rock mass hazard sources is fundamental for preventing rockfall and landslide disasters in mountainous regions,with rock mass structural characteristics playing a vital role in hazard assessment.In this study,terrestrial laser scanning(TLS)and unmanned aerial vehicle(UAV)technologies were integrated to enhance the evaluation methodology for rock mass hazard sources,focusing on the Sichuan Yanjiang Expressway project in China.The findings demonstrate that TLS-UAV technology enhanced both spatial coverage and data density in slope modeling.Through integrated algorithmic analysis,rock discontinuities within heterogeneous datasets were systematically identified,enabling quantitative extraction and statistical analysis of key geometric parameters,including orientation,trace length,spacing,and roughness.Furthermore,quantitative models were developed for cohesion,friction angle and the morphology parameter M of in situ discontinuities,respectively,facilitating efficient mechanical parameter acquisition.A novel rock mass hazard index(RHI)was developed incorporating discontinuity geometric rating(DGR),discontinuity mechanical rating(DMR),and slope mass rating(SMR).Field validation confirmed the methodology's effectiveness in evaluating risk levels and spatial heterogeneity of rock mass hazard sources,revealing the contribution of different discontinuity sets to the rock mass hazard and identifying the primary discontinuity sets controlling instability mechanisms.This study is of great significance for evaluating discontinuity-controlled rock mass hazard sources and preventing rockfall disasters.