土质高边坡在饱和状态下的稳定性分析

土质高边坡在重力式挡土墙作为支护条件下处于稳定状态,然而,一旦经历长时间强降水作用,高边坡土体便处于饱和状态,安全系数必然降低,严重时发生滑坡事故1].为了防止事故的发生,提前预知边坡的稳定性状况,研究土体内某一点应力变化,推导出应变值和稳定性系数.利用ANSYS模型与理论计算对比,得出最小稳定系数即安全系数,结合现场实测水平位移数据对边坡稳定性进行判定.结果表明,在饱和作用下,土体内部抗剪强度指标减小,稳定性降低,水平位移变大.

Stability Analysis of High Soil Slope under Saturation

The high soil slope is in stable state under the supporting of gravity retaining wall,how-ever,once during a long time heavy rainfall,the high slope soil is so saturated that safety factor must decrease and the landslide accident may occur in severe case.In order to prevent the occur-rence of accidents and predict the stability conditions of slope,this paper studies stress change of a point of soil,and introduces strain value and stability coefficient.Compared with ANSYS model and theoretical calculation,the theory can acquire the minimum stablility coefficient that is called the safety coefficient.the field measured data of horizontal displacement is used to determine the slope stability.The results show that in saturation effects,shear strength index inside a soil-mass decreases,the stability decreases and the horizontal displacement becomes larger.