基于FLAC^(3D)与强度折减法的大岗山右岸边坡稳定性分析

Stability Analysis of Dagangshan Right Bank Slope,Based on FLAC^(3D) and Strength Reduction Method

大岗山水电站右岸边坡为高地应力区高陡边坡,破体内部存在多处顺倾断层与软弱辉绿岩岩脉,地质条件较差。边坡开挖过程中,坡体内部卸荷裂隙带受影响,导致坡体稳定性急剧下降,坡面出现若干宏观裂缝,对边坡的安全造成严重威胁,为准确获取坡体安全状态与可能的破坏模式,本文采用FLAC^(3D)与强度折减法对右岸边坡典型剖面进行稳定性分析计算,给出安全系数及潜在滑面位置,为边坡的加固治理提供参考。

The right bank slope of Dagangshan hydropower station is high and cliff with high in-situstress,and lots of dip faults and weak diabase dikes are generated inside the slope,which result in a poor geological conditions.During slope excavation process,the unloading fissures inside the slope is influenced,which leads to a sharp decrease in the stability of the slope. Besides,lots of macroscopic cracks are generated on the surface of the slope,which causes the decrease in the safety index of the slope.In this piece of work,in order to find out the safety state and possible failure modes of the slope accurately,FLAC^3D and strength reduction method were used to analysis the stability of the typical profile of the right bank slope. The aim is to understand the safety index and the positions of potential slippage,and to provide advice of reinforcing the slope.