西藏某古滑坡库岸边坡稳定性分析及防治工程评价

Stability analysis on reservoir bank slope of an ancient landslide in Tibet and evaluation of its control project

水库库岸边坡的稳定性分析对水库运营安全的评估以及工程防治措施的选取具有指导意义。为此,选取西藏某典型的库岸边坡,通过现场调查、钻孔监测数据以及数值模拟方法进行边坡稳定性分析,并对工程治理效果进行定量评价。结果表明:库岸边坡的主变形区分布在坡体的中、下部,库水位的下降导致坡体内部的水压力变化是边坡失稳的主要诱发因素,失稳方式以牵引式为主。同时,采用双排桩加固方案可以有效地控制边坡在水位下降及暴雨工况下的变形失稳。

A typical reservoir bank slope in Tibet is selected as the study case herein for analyzing the slope stability and making the quantitative evaluation on the effect of the relevant engineering treatment through the methods of in-situ investigation,drill-hole monitoring data and numerical simulation.The results show that the main deformation zone of the reservoir bank slope distributes in the mid-lower part of the slope,while the water pressure change inside the slope caused by the drop of the reservoir water level is the main inducing factor and the instability mode is dominated by a kind of pulling.Meanwhile,the deformation instability of the slope under the conditions of the water level drop and rainstorm can be effectively controlled with the scheme of double-row pile strengthening.