有限元强度折减法在边坡稳定性分析中的应用

运用有限元软件和强度折减法，对某水电站右岸工程区边坡稳定性进行分析。结果表明:右岸泄洪排沙洞进口边坡总体为横向坡，根据边坡走向倾向与结构面发育特征之间的关系判断，该工程区边坡发生平面滑动的概率很小；在设计开挖坡比条件下，虽然存在发生楔形滑动的可能性，但由于随机结构面本身发育稀疏而使组合的分布点位有限，其组合交线倾角过缓或过陡均使滑出的可能性减小；右岸泄洪排沙洞进口边坡基本呈弹性状态，稳定性好，其稳定性相对薄弱的部位位于边坡中上部高程805.0 m的马道，破坏深度在1.5 m以内。

Application of Finite Element Strength Reduction Method in Slope Stability Analysis

the stability of the slope in the right bank project area of a hydropower station is analyzed by using the finite element software and strength reduction method. The results show that the right bank spillway sediment discharge tunnel inlet slope is generally transverse slope, from the judgment according to the relationship between the slope direction and tendency and structural surface development characteristics, the probability to occur plane sliding of the slope in this engineering area is very small; In the design of excavation slope ratio conditions, although the possibility of wedge sliding is existing, due to sparse development of random structure face itself which makes the distribution point location of combination is limited, the dip angle of combined intersection line is too slow or too steep to reduce the possibility of slipping out. The right bank spillway sediment discharge tunnel inlet slope is in elastic state with good stability, the stability is relatively weak in 805 m elevation packway of the middle-upper part of the slope, the failure depth is only within 1.5 m.