长安地裂缝带黄土的微观结构特征研究  

Research on the Micro-texture Characteristics of Loess Located in the Ground Fissure Zone of Chang'an Area

作　　者：宋彦辉[1] 李忠生[1] 

机构地区：[1]长安大学地质工程与测绘学院,西安710054

出　　处：《安全与环境工程》2012年第6期17-21,共5页Safety and Environmental Engineering

基　　金：国家自然科学基金项目(40972215);陕西省自然科学基础研究计划项目(SJ08D04)

摘　　要：以长安地裂缝带黄土为研究对象,通过采取裂缝面上的黄土及未受裂缝影响的原状黄土进行电镜扫描试验,对两者的微观结构特征进行了对比研究,并分析了裂缝带附近黄土物理力学性质变异的原因。结果表明:裂缝面黄土与原状黄土在微观结构上存在显著差别,主要表现为裂缝面黄土颗粒接触类型为面-面接触,具有定向排列现象,颗粒之间孔隙较小、结构致密,并可见明显的擦痕,原状黄土颗粒接触类型则表现为棱-面接触或面-面接触,并发育缝隙状孔隙,总体为镶嵌孔隙结构;两者微观结构的差异表明地裂缝的活动具有剪切滑移特征。Taking the ground fissure in Chang＇an area as study object, this paper analyzes the micro-textures of ground fissure loess and undisturbed loess through the SEM test. The results show that there are some obvious differences between them. For ground fissure loess, the contact of loess particles is surfacesurface contact, the pore size of particles is very small ,particles have directional arrangement and scratches are highlighted due to ground fissure activities. For undisturbed loess, edge-surface contact and surfacesurface contact exist simultaneously, crevice-like pores of particles are common and generally the mosaic structure can he named for this sort of sample. Based on the above results, the paper deduces that ground fissure activities have the characteristics of shear slip, and explains the variation of physical and mechanical properties of loess near the ground fissure.

关 键 词：地裂缝 黄土 微观结构特征 电镜扫描 

分 类 号：X43[环境科学与工程—灾害防治] P642.131[天文地球—工程地质学]