四川省雷-马-屏监狱通木溪滑坡形成机制分析与稳定性评价

通木溪滑坡为一老滑坡。其前缘为滑坡强变形区；中部为弱变形区；上部为老滑坡区。滑坡复活始于1998年。2001年滑坡发生。造成5400m^2的建筑变形破坏，直接经济损失300多万元。老滑坡的形成是滑坡复活的基础条件之一。中部生活用水入渗滑体滑带，大量建筑物加载，修筑公路局部开挖坡脚，前缘通木溪河常年掏蚀坡脚及降雨冲刷坡体和入渗补给滑体滑带成为滑坡前部复活的重要诱因。目前，老滑坡处于稳定状态。弱变形区和强变形区处于欠稳定一基本稳定状态。滑体饱水及地震工况下，强、弱变形区均处于欠一不稳定状态，且强变形区稳定性最差。横向上，中部稳定性较两侧差；纵向上，滑坡中前部稳定性比后部差。因此，开展对该滑坡的形成机制研究，将具有十分重要的现实意义。

The formation mechanism analysis and stability evaluation of Tongmuxi landslide in Leimaping prison in Sichuan Province

Tongmuxi landslide is an old landslide. Intense distortion occurred in its foreside and weak distortion in the middle part. There is no deformation in the upside of the landslide. Tongmuxi landslide reactivated in 1998 and slid in 2001. About 5400m 2 buildings were damaged during the local slide. The direct economic loss is more than three million Yuan. The old landslide is one of basic condition for the slide. The other factors influencing the slide are as follows: the infiltration of daily water into the slip plane, the load of buildings, the excavation of the foot of slope in the course of reconstructing road, the undercutting of the Tongmuxi River along the landslide edge, and the erosion and penetration of rainfall.;As a whole, the old landslide is under a stability state. But the intense and weak distortion parts are under an instability state. It will befell deformation or failure when the slope is in the water-saturated condition and/or in earthquake condition. The stabilization of the midland is lower than that of both sides in transverse direction and the stabilization of foreside and middle part is lower than that of upside. It is very important to study the Tongmuxi landslide formation mechanism.