黑方台台缘剖面土体的物理力学性质分析

黑方台台缘频繁发生的黄土滑坡,作为农业引水灌溉诱发的地质环境破坏问题备受关注。台缘剖面的地质结构及土体的物理力学性质是决定斜坡变形破坏的基本条件。通过野外调查,选择典型的台缘边坡剖面,系统采集样品,进行土体的基本物理力学性质试验,获得了土体物理力学指标随深度的变化规律,探讨了剖面上土体性质差异对滑坡形成发育的影响。结果表明：垂向上各土层性质差异及其耦合作用决定了滑坡剪出口及泉水的出露位置,进而影响到斜坡的变形破坏过程和滑坡的有关特征。

Analysis of the physico-mechanical properties of the soil in Heifang platform margin profile

Loess landslides disasters are serious in Heifang platform margin,and it causes great concerns as a geological environment problem induced by agricultural irrigation. It is the basic conditions that the geological structure of the platform margin profile and the physico-mechanical properties of the soil determine the slope deformation and failure. In consideration of that,typical platform margin slope profile is selected through field investigation,and samples are collected systematically. The acknowledgement of the change rule of the physicomechanical properties of the slope soil with depth is gained based on a series of basic soil tests. The effects of the differences of soil properties on the formation and development of the loess landslides are explored. The results shows that the vertical differences in soil properties and their interaction determine the locations of shear outlet of landslide and spring head,and thus affect the deformation and failure processes of the slope and other characteristics of the loess landslides.