小湾高拱坝拱座稳定三维极限分析

小湾岩体存在两组垂直结构面和一组倾向河道的卸荷裂隙。拱座稳定存在着沿拱推力方向的重力方向组合的空间滑动模式。本文首先介绍了一个建立在塑性力学上限定理基础上的边坡稳定分析三维极限分析方法，并使用这一方法计算小湾拱座的稳定安全系数，获得比较符合的稳定分析成果。

Xiaowan High Arch Dam Abutment Stability 3－ D Limit Analysis

There are two sets of vertical shearing planes and one set of relaxed fissures dipping towards the river course in the rock mass at the Xiaowan dam site. In terms of the arch abutment stability the spatial sliding patterns created by their combination along the arch thrust and gravity directions should be considered. This paper gives a presentation of the 3-D limit analysis method developed on the basis of the plasticity mechanics upper limit theorem for slope stability analysis, and of the stability safety factor of the Xiaowan arch abutment calculated using this method which could give stability analysis results conforming to the actual conditions.