多层复杂滑坡的稳定性分析与支护选择

 工程中常见发育多层滑面的大型复杂滑坡，受工程边坡的改造和工程结构的作用其坡体结构与应力状态都发生改变，原有的滑面可能不再是最危险滑面，而会在原滑面的基础上形成新的最危险滑面，目前工程中对此关注不多。提出指定剪出点的稳定性核算方法，假定工后滑坡中的最危险滑面为新生滑面与原滑面的组合滑面，采用一种新的搜索方法确定坡面各点的安全系数，据此对多层复杂滑坡进行稳定性分析，在此基础上进行滑坡的支护选型并确定合理的支护设置位置，以实际工程为例详细论述该方法的应用步骤，并提出大型滑坡的支护设置原则，研究结果对大型复杂滑坡的支护选型和设计有一定指导意义。

STABILITY ANALYSIS AND SUPPORTING SELECTION OF MULTI-LAYER COMPLEX LANDSLIDE

There are some complicated landslides with several layers of slipping plane in the geotechnical engineering. Because of the alteration of engineering slope and the action of engineering structure，the slope structure and stress state will be changed. The original slide surface is not the most critical one，but the new critical slide surface will form based on it. Now little attention is paid to it. In this paper，a stability calculation method with the specified shear-out point is proposed，and a new search procedure is adopted to calculate factor of safety of each point on the slope surface. This method assumes that the most critical slide surfaces after construction is the combined sliding surfaces of the new and the original. Based on the method，the stability analysis is conducted for the multi-layer complex landslide. And the result is adopted to design supporting structure form and to determine the appropriate supporting position. Taking a practical engineering slope as an example，the application procedure of this method is described in details；and the design principle of supporting for large scale slide is suggested. The research result is meaningful for supporting design of complicated landslide.