不同库水消落方式下动水压力型滑坡变形与稳定性响应研究

水库滑坡灾害是大型水库运行调度工作中备受关注的问题.为了科学指导汛期水库运行调度中的滑坡灾害风险防控,基于库水动力作用效应及类型分析,通过大型离心模型试验和数值模拟研究了库水下降诱发滑坡变形破坏机理,重点分析了库水持续性下降、不同间歇期下降、相同间歇期多阶段下降三种消落方式下的滑坡稳定性响应规律.研究表明:在库水下降末...

Study on deformation and stability of hydrodynamic landslide under different reservoir water fluctuation modes

Ｒeservoir landslide disaster is a problem of great concern in the operation of large reservoirs． In this paper，in order to guide the operation of reservoir in flood season and control the risk of reservoir landslide，the research on the deformation and stability response of hydrodynamic landslide under different reservoir water fluctuation modes is carried out． Base on analysis on the effect and type of reservoir hydrodynamic action，through numerical simulation and large-scale centrifugal model test，the stability response law and deformation mechanism of landslide induced by reservoir water falling is revealed． The stability response law of landslide under three kinds of fluctuation modes，namely，the continuous decline of reservoir water，the decline of different intermittent periods and the multi-stage decline of the same intermittent period，are analyzed． The results are as follows: At the end of reservoir water decline，with the rapid decline of slope hydrostatic pressure，the groundwater level in the landslide body seriously lags behind the reservoir water level change，which easily leads to high hydrodynamic pressure and landslide deformation and damage． In the process of continuous decline of water level，the greater the decline rate of reservoir water，the greater the head difference，and the greater the underground hydraulic gradient，the stability will continue to decline． Compared with the continuous decline in different intermittent periods，the groundwater gradient ratio decreases，which can alleviate the influence of groundwater lag and hydrodynamic pressure caused by the continuous and rapid decline of reservoir water level，and the stability decline rate will slow down． However，the multi-stage decline in the same intermission period can further reduce the impact，and the decrease range of stability is significantly reduced．