非饱和土边坡抗剪强度的力学参数影响及灵敏度分析

摘要

运用非饱和土的双应力变量理论,采用强度折减法详细分析土体各参数对边坡安全系数的影响,并通过灵敏度分析各参数对安全系数的影响.工程算例结果表明:各参数的变化对边坡安全系数的影响基本呈线性规律,其中土体含水率对安全系数影响线最显著;含水率、黏聚力和内摩擦角是非饱和土边坡稳定性分析的重要物理力学参数,为降雨条件下非饱和土边坡加固设计参数选取提供了依据.%On the basis of the double-stress invariant theory of unsaturated soil, the influence of soil parameters on safety factor was analyzed with strength reduction methods. Then the impact of soil parameters on safety factor was analyzed by calculating sensitivity. The calculation results show that the linear relationship can be obtained between safety factor and soil parameters. And the most significant factor of influence on safety factor is the moisture content. Moisture content, cohesion and angle of friction are designated as some important physical and mechanical parameters of unsaturated soil slope. The result can provide the basis for selecting parameters of slope reinforcement during rainfall infiltration.