Abstract: In order to determine the stability of deformation mass No. 1 of Wuqiangxi hydropower station, FLAC-3D was used to carry out three-dimensional numerical simulation analysis. The displacement and stability safety coefficient of the slope, the maximum shear strain increment of the slope and the slope sliding surface position were obtained. The analysis results showed that the safety coefficient of 3-3' section was relatively small, which was the main potential sliding direction of the slope, and the maximum deformation of the slope also appeared in the 3-3' section. The slope deformation was mainly in the vertical direction, followed by the horizontal deformation in the direction of riverbed. The study showed that the deformation mass may be unstable, so the monitoring of deformation mass should be strengthened and necessary engineering measures should be taken to prevent the occurrence of instability.

Key words: deformation mass, stability analysis, FLAC-3D, strength reduction method

摘要： 为了确定五强溪电站1号变形体的稳定性, 采用FLAC-3D进行三维数值模拟分析，得到边坡位移和稳定安全系数、边坡最大剪应变增量以及边坡滑动面位置。分析结果表明：3-3′剖面的安全系数相对较小，是该边坡的主要潜在滑动方向，且最大变形也出现在3-3′剖面，边坡的变形以垂直向为主，水平向偏河床方向的变形次之。研究表明，该变形体存在失稳可能，应加强监测并采取必要的工程措施来防止失稳的发生。

关键词: 变形体, 稳定性分析, FLAC-3D, 强度折减法