断裂控制的滑坡机理研究以柳家坡滑坡为例

本文针对受红椿坝-曾家坝断裂控制的陕西省安康市岚皋县柳家坡滑坡,在现场调查分析的基础上,采用Midas/GTS软件对其形成机理进行了三维数值模拟研究。模拟结果表明,断裂对该滑坡的发生起着控制性的作用,岩土体的性质决定了该滑坡的类型,而水和人类工程活动触发了该滑坡的发生。得到柳家坡滑坡的变形破坏模式为:坡体前缘向前运动,西侧断层强烈破碎带通过处侧壁剪切破坏,坡体后缘产生张拉裂缝,从而带动东侧坡体的变形破坏。由于坡体前缘为修建公路开挖的临空面,坡脚处缺失支撑,诱发了滑坡的发生。柳家坡滑坡形成机理的模拟结果可为日后相似条件下滑坡的防治提供一定的借鉴。

NUMERICAL SIMULATION ON MECHANISM OF FAULT-CONTROLLED LIUJIAPO LANDSLIDE

The Liujiapo landslide is controlled by Hongchunba-Zengjiaba fault. In order to study the formation mechanism of the landslide, based on the field investigation, a three-dimensional finite element numerical simulation model is established. The simulation results with Midas/GTS software show that the fault plays a controlling role of the landslide and the water triggers the occurrence of the landslide. The deformation mode of Liujiapo landslide is summarized as follows. The slope occurs shear failure on the west side where the fault crosses and the frontal zone moves forward to drive the deformation of the east side. As the free face lies in front of the slope, the landslide occurs when a through plane is formed. The results have certain reference function to prevent landslides under similar conditions in the future.