边坡变形破坏是水利水电工程中多发的地质灾害之一,通过三维数值模拟开展边坡稳定性评价对防灾减灾及滑坡预报具有重要的意义和价值.本文对云南腊寨水电站坝址右岸边坡进行了数值计算.经过调查边坡工程地质条件,本文试图通过分析边坡岩体结构类型、结构面与坡面的产状关系以及诱导因素研究边坡变形成因机制,在此基础上,利用FLAC3D三维数值模拟分析方法,分别计算了原始边坡、开挖未支护和支护后的边坡应力场、位移场和塑性区分布,结合工程地质条件分析,对其变形机制进行了深入探讨.研究结果表明,边坡处于压致拉裂的初始阶段,边坡变形受开挖作用影响明显.根据边坡变形研究结果提出相应的支护方法,包括预应力锚索、网格梁和挂网喷锚等方法,使边坡变形得到有效控制.%Slope failure is one of the geological disasters frequently occurring in water resources and hydropower engineering.The evaluation on slope stability with three dimensional numerical simulation is of great significance and value for the disaster prevention and mitigation and landslide forecast.This paper mainly studies the slope stability at the right bank of Lazhai hydropower station.The station is located in Yunnan Province,China.The paper presents a systematic investigation of the site engineering geological conditions the type of rock mass structure,and the mechanism of deformation.It examines the occurrence relations between structural plane and slope and the potential induction factor of the failure of the slope in detail.Meanwhile,the stress filed,the displacement field and the distribution of the plastic zones of the original slope,the non-supporting and supporting slopes after excavation are respectively obtained with true-three-dimensional numerical simulation (FLAC3D).The mechanism of the deformation is analyzed,combining the analysis of the engineering geologic condition.The results shown the slope is in the initial stage of tension and its deformation is affected by the excavation obviously.According to the research results of the slope deformation mechanism,some corresponding reinforcement measures are taken to control the deformation of the slope.These measures mainly include the prestressed anchor cable,grid beam and suspended net shotcrete.
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