降雨与水位波动作用下的水库边坡稳定性影响研究

Influence of Reservoir Slope Stability Under the Action of Rainfall and Water Level Fluctuation

以某水库边坡为研究背景,通过大型模型箱试验来分析降雨强度、库区水位波动及其组合作用等因素对库岸滑坡的诱发机制。结果表明:受库区水位波动影响,库岸坡体变形主要集中在前缘,期间库区水位下降速率与库岸坡体变形速率呈正相关关系,水位下降越大,变形趋势越显著;降雨作用下库岸边坡变形存在显著时空差异性现象。空间上,变形主要集中在库岸坡体的前缘和后缘,时间上,短时的强降雨对库岸坡体变形影响不大,当库岸坡体浅层土壤饱和之后,随降雨发生其变形逐渐显现出来;在降雨和库区水位下降两因素联合作用下,库岸坡体呈现显著的牵引式破坏。

Taking a reservoir slope as the research background,a large-scale model box test was used to analyze the inducing mechanism of factors such as rainfall intensity,water level fluctuation in the reservoir area and their combined effects on reservoir bank landslides.The results show that due to the fluctuation of the water level in the reservoir area,the deformation of the bank slope is mainly concentrated in the front edge.During the period,the water level drop rate in the reservoir area was positively correlated with the deformation rate of the bank slope.The greater the water level drop,the more significant the deformation trend.There are significant spatial and temporal differences in the slope deformation of the reservoir bank under the action of rainfall.Spatially,the deformation is mainly concentrated in the front and rear edges of the reservoir bank slope.In terms of time,the short-term heavy rainfall has little effect on the deformation of the reservoir bank slope.When the shallow soil of the reservoir bank slope is saturated,its deformation gradually emerges with rainfall;under the combined action of rainfall and the water level drop in the reservoir area,the reservoir bank slope presents significant traction damage.