梨园水电站下咱日堆积体稳定性分析

以梨园水电站坝前左岸分布的大规模下咱日堆积体为例,通过分析堆积体物质组成及堆积体与基岩接触面的物理力学特性,确定堆积体的边界条件,并初步判定其可能的变形及破坏模式。以此为基础,采用三维极限平衡方法对沿堆积体与基岩接触面的假设滑面及由二维极限平衡分析出的最危险滑弧拟合出的三维空间滑面进行了分析,确定了不同滑面的安全系数。根据有限元三维分析成果,基于位移梯度理论提出了堆积体三维滑面确定方法,分析方法能够搜索任意形式滑面,同时兼顾考虑堆积体的三维效应。分析表明各工况下堆积体稳定性均能满足要求,计算成果为工程设计提供了重要参考。

3D Stability Analysis on Xiazanri Deposit of Liyuan Hydropower Station

This paper is a case study of Xiazanri deposit which is of large scale and located at the left bank of Yilyuan hydropower station upstream the dam.The deposit boundaries as well as possible deformation and failure modes were determined according to deposit components and characteristics of contact surface between bedrock and deposit.Then slope stability analysis was conducted under two occasions by using 3D limit equilibrium method:sliding along the contact surface between bedrock and deposit;sliding along the surface determined by fitting curves obtained from 2D limit equilibrium analysis.Based on slope 3D finite element analysis and displacement gradient theory,3D sliding surface of the deposit was determined.Various types of sliding surfaces can be obtained and three dimensional form of deposit can be taken into account by using this method.Result shows that the deposit is stable under various working conditions and it provides important reference to project design.