库水位涨落耦合降雨条件下的滑坡稳定性分析

Stability Analysis of Landslide under the Fluctuation of Reservoir Water Level Coupled with Rainfall

为研究三峡库区库水位涨落与强降雨条件下沿岸滑坡的稳定性,以野猫面滑坡为研究对象,利用Morgenstern-Prince法对滑坡在库水位调度过程中的稳定性进行研究,并分析水位调度速度与降雨情况对滑坡稳定性的影响。结果表明:滑坡在库水位由162 m以2.0 m/d的速度降至145 m过程中叠加汛期50年一遇的暴雨时滑坡最为危险,此时稳定系数为1.053。在仅有库水位变化的过程中,水位下降越快,滑坡越危险,在仅有降雨控制时,降雨强度越大或者降雨历时越长都会使滑坡稳定性降低,所以对于三峡沿岸滑坡要重点关注水位快速下降与强降雨期间的变形,提前做好预测预警。

In order to study the landslide stability of landslides along the bank of the Three Gorges reservoir area at the rise and fall of reservoir water levels and heavy rainfall,the Morgenstern-Prince method was used to study the stability of Yemaomian landslide during reservoir water level scheduling,and to analyse the effects of the water level scheduling speed and the amount of rainfall on the stability of landslides.The results show that the landslide is most dangerous when the water level drops from 162 m to 145 m at a rate of2.0 m/d coupled with a 50-year rainstorm during the flood season,and the stability coefficient of 1.053.When there are only changes in reservoir level,the faster the water level drops,the more dangerous the landslide is,and when rainfall only,the stability of the landslide decrease with the rise of rainfall intensity or the rainfall duration,For landslides along the Three Gorges,we should pay special attention to the deformation during the rapid drop of water level and heavy rainfall,and make predictions and warnings in advance.