三峡水库年周期调度内降雨模式对白水河滑坡稳定性影响研究

Study of Impact of Rainfall Modes in Annual Cycle of Three Gorges Reservoir on Stability of Baishuihe Landslide

通过将三峡库区水位年调度周期概化为6个阶段,以白水河滑坡为研究对象,选取对滑坡最不利的3个阶段,开展了不同降雨开始时间及不同降雨形式对滑坡稳定性的影响研究.结果表明:在AB和DE阶段,降雨发生时间越晚,即相应库水位越低时,对于滑坡稳定性越不利;在AB、BC和DE阶段,白水河滑坡稳定性整体处于较低水平,滑坡稳定性系数在递增型和中间小型的降雨时较小,在递减型和中间大型的降雨时较大.研究结果可以为白水河及类似滑坡稳定分析及预测提供一些依据.

By generalizing the water level annual dispatching period into six stages in the Three Gorges reservoir area and taking Baishuihe landslide as the research object,the study of the effects of different rainfall start times and different rainfall patterns on the stability of the landslide are carried out with the selected three most unfavorable stages for the landslide.The results show that in the AB and DE stages,the later the rainfall occurs,that is,the lower the water level of the corresponding reservoir,the more unfavorable the stability of the landslide;In the AB,BC and DE stages,the stability of the Baishuihe landslide is generally at a low level,the stability coefficient of the landslide is smaller in the incremental and intermediate small rainfall,and larger in the decreasing type and the middle large rainfall.The research results can provide some basis for the stability analysis and prediction of Baishuihe and similar landslides.