三峡库区猴子石滑坡地下水动力场分析

三峡库区的猴子石滑坡位于奉节县新城核心地段,滑坡体上有奉节县汽车客运中心、综合广场等近20个迁建单位与大量居民住宅楼,保证边坡稳定性有重要的意义。三峡水库蓄水后在猴子石滑坡部位将会形成较大的地下水压力,特别是在库水位骤降情况下,坡体内将产生较大的动水压力,这对边坡稳定非常不利。通过数值模拟不同工况边坡地下水渗流场可知,库水位从175m骤降至145m时,猴子石滑坡所受动水压力为正常蓄水位时的13倍,进行稳定计算时必须考虑动水压力的影响。最后对降低地下水位工程措施实施后的渗流场也进行模拟,为治理工程设计提供科学依据。

GROUNDWATER ANALYSES OF HOUZISHI LANDSLIDE IN THE THREE GORGES RESERVOIR

The Houzishi landslide lies in the center area of new Fengjie County Town.On the landslide bodyt,here are a great deal of resident houses and almost 20 relocated organizations including Fengjie passenger transport center,colligation square and so on.It is important to ensure the stability of slope.After the storage of the Three Gorges Reservoir,the landslide body will be subjected to bigger groundwater pressure,and especially,under the circumstance of sudden lowering of water level,dynamic water pressure will be induced in the landslide body,which is negative to the stability of the slope.According to the simulation of the seepage field in many cases,when the water level is suddenly lowered from 175 to 145 m,the dynamic water pressure on the landslide body is 13 times as that of normal water level,so the effect of dynamic water pressure must be considered in the stability calculation.At last,the seepage field under the engineering measures of lowering groundwater table is also simulated to provide theoretical basis for the design of treatment.