非饱和土边坡稳定的安全分析及进展

笔者基于基质吸力和土抗剪强度之间的关系和非饱和土力学理论 ,以基质吸力问题为中心 ,通过工程实例对影响非饱和土边坡滑动的各种内在及外界因素进行了参数分析 ,尤其对降雨入渗和裂隙影响的定量分析新进展进行了研究。研究结果表明 :非饱和土边坡稳定分析应加强考虑基质吸力对抗剪强度的折减影响 ,修正极限平衡方法对考虑降雨入渗 ,裂隙影响及暂态渗流的非饱和土边坡稳定性研究具有工程意义和实用价值。

Stability Analysis of Unsaturated Soil Slope and Its Progress

Based on the relationship between the suction and shear strength of soils and the theory of unsaturated soils, the safety analysis of the fundamental behavior of slope stability of unsaturated soil is conducted. Some important properties of unsaturated soil associated with slope stability are discussed emphasizing on the rainfall infiltration and the influence of crack. The major internal and external factors affecting the slope stability in unsaturated soil are discussed with the utmost concern to suction. Special discussion is put forward on the recent development in the quantitative analysis for the effect of cracks on rainfall infiltration and shear strength of soils. Comprehensive search study on the behavior of rainfall infiltration into unsaturated soil slope and some new finding for the mechanism of rain-induced landslides in unsaturated soils are presented. On the basis of the case study obtained from field-tests, the influence of suction on shear strength of unsaturated soils should be considered during the slope safety analysis and the slope stability analysis considering the influence of crack and rainfall infiltration is studied.