库区水位变动对花莲树滑坡局部与整体稳定性影响分析  

Comprehensive Analysis on the Influence of Water Level Variation on Local and Overall Stability of Hualianshu Landslide Area

作　　者：覃茂森 程圣国[1] 刘朝[1] 陈勇[1] 

机构地区：[1]三峡库区地质灾害教育部重点实验室,湖北宜昌443002

出　　处：《水力发电》2017年第12期20-24,共5页Water Power

基　　金：三峡库区地质灾害教育部重点实验室开放基金项目(2015KDZ01);三峡大学研究生创新基金(SDYC2016022)

摘　　要：利用Geo-Studio软件,在6种库水位升降工况下,对花莲树滑坡的渗流场与稳定性进行计算。结果表明,滑坡前缘在库水位变动期呈现出阶跃式变形特征,局部稳定性受库水位变化影响显著;库水位下降工况下,滑坡前缘地下水位线呈现出内凹现象,稳定性系数先下降后上升,库水位下降速率越大,稳定性系数下降越快,当库水位下降速率达到1.5 m/d,滑坡整体稳定性较好,但此时滑坡前缘的稳定性系数已经低于临界值1,将会发生失稳破坏;滑坡变形程度从滑体后部至前部逐渐增大,前缘局部的不稳定特征使得滑动模式向牵引式滑坡演变。The Geo-Studio software is used to calculate the seepage field and the stability of Hualianshu landslide under the conditions of six rise and fall operations of reservoir. The results show that the frontier of landslide shows stepwise deformation characteristics in reservoir water level fluctuation period and the local stability of landslide is significantly affected by the change of reservoir water level. Under the condition of water level fall, the groundwater level line in the front of landslide shows a concave phenomenon, the stability coefficient decreased first and then decreased, the stability coefficient will fast decrease when the reservoir water level is rapidly decreased. The stability of landslide is better when the drop rate of reservoir water level reaches 1.5 m/d, but the stability coefficient of landslide will lower than the critical value of 1, that means the failure of landslide will occur. The deformation degree from the back to the front of landslide body will gradually increase and the localized unstable characteristics of the front edge will make the sliding mode evolving to traction landslide.

关 键 词：库水位升降 滑坡 稳定性分析 数值模拟 

分 类 号：TU457[建筑科学—岩土工程] TU271.9[建筑科学—土工工程]