某水电站雾化区古崩滑坡体稳定性分析

摘要

The stability of atomized slope at hydropower station has become one of the important problems of hydropower construction.Based on the investigation of the engineering geological conditions of the ancient collapse sliding mass,the deformation and failure phenomena and influence factors of the slope stability are analyzed.It is considered that the accumulation slope may generate deformation and failure mode of creepcracking.In this paper,the numerical simulation is used to analyze the deformation and failure mode of slopes under natural and flood discharge atomized conditions.Numerical simulation results show that the deformation and failure of the slope is mainly controlled by the maximum shear stress of the accumulation body.The ancient collapse sliding is likely to be resurrected under the condition of flood discharge atomization.Finally,the paper analyses the slope stability by limit equilibrium theory of rigid body.The results show that due to the possibility of overall unstability of the accumulation body during the operation of hydropower station,the accumulation body needs to be treated so as to ensure the safety of the station.%水电站雾化边坡的稳定性已成水电建设的重要问题之一.通过对雾化区古崩滑坡体工程地质条件的调查,已有变形破坏现象和边坡稳定影响因素的综合分析,认为堆积体边坡可能发生蠕滑-拉裂的变形破坏模式.采用数值计算分析了在天然和泄洪雾化条件下的变形破碎模式,分析表明:边坡变形破坏主要受控于堆积体内部的最大剪应力,在泄洪雾化条件下古滑坡极可能出现复活.最后,通过刚体极限平衡理论对边坡进行了稳定性分析.