非饱和黄土微观结构与黄土滑坡

原状黄土属于非饱和黄土,对非饱和黄土的微观结构研究对于研究黄土地区边坡的稳定性具有重要意义。通过研究区黄土的SEM图像的微观结构分析和利用Janbu法对典型黄土滑坡进行边坡稳定性的计算分析,认为该地区黄土的内部微观结构以架空结构和镶嵌结构为主,在大颗粒上附着的胶结物较少;随着深度的增加,土体上覆压力增大,土体具有明显的挤压变形现象;黄土体在天然状态下处于极限稳定状态,随着含水量增加,边坡稳定性下降,达到饱和状态时,处于不稳定状态;随着黄土地区经济的快速发展,人类水事活动和工程性经济活动广泛开展,人为因素逐渐成为诱发滑坡发生的主导因素。

Microstructure of Unsaturated Loess and Loess Landslide

The original loess belongs to unsaturated loess,the research of unsaturated loess has an important meaning to the slope stability of loess region.The microscopic structure of loess is analyzed using SEM image and the stability of a typical loess landslide is evaluated using Janbu method.The study result shows that cementation is less on the big particles.With the increase of the depth,the overburden increa-ses.Soil mass has obvious extrusion deformation.The loess body in the natural state is stable,but the stability of the slope decreases with water content.The slope becomes unstable when the loess is saturated.With the rapid economic development,human water matter activity and extensively development of economic activities of engineering continually expand in the loess area.Human activities gradually become the main factors of landslide causing.