西藏某滑坡成因机制分析及治理工程设计初探

Preliminary study on the analysis of formation mechanism and the design of control project for a landslide in Tibet

某滑坡位于西藏昌都镇境内,总体积52 6×104m3,复活部分体积仅14 7×104m3。因其位置特殊、危害严重、社会影响强烈而倍受各方重视。该滑坡诱发机制为在异常的气候条件下,人类工程活动———不合理开挖坡脚可能导致古滑坡体的中、前部复活。文章结合滑坡的形态、结构特征,采用地质历史分析法,剖析滑坡形成机制,探讨滑坡复活变形影响因素,评价滑坡稳定性及其演化趋势;在此基础上,结合该滑坡前缘一带建有高挡墙的这一特殊情况,进行了滑坡治理工程的初步设计。

The landslide is located in Changdu Town,Tibet. Its total volume is up to 526×104m3,while its revival part is only 147×104m3. The landslide has received much attention because of its special location, serious damage and social effect. The formation mechanism of the landslide is caused by the unreasonable excavation of its slope under the abnormal weather condition of the area. Based on the shape and the structure characteristics of the landslide, the genetic mechanism has been analyzed by using geological history method, the influential factor for the revival and deformation of the landslide has been discussed, and the stability and evolution trend of the landslide have been evaluated.Considering a high retaining wall built in the front of the landslide,preliminary design of the control project has been carried out.