降雨入渗的边坡稳定评价方法  

Evaluation method of slope instability under rain infiltration

作　　者：胡立雄[1] 白会人[1] 

机构地区：[1]大连大学建筑工程学院,辽宁大连116622

出　　处：《辽宁工程技术大学学报（自然科学版）》2007年第2期235-237,共3页Journal of Liaoning Technical University (Natural Science)

基　　金：国家自然科学基金资助项目(60371035)

摘　　要：针对热带与亚热带地区由于降雨引起的边坡失稳,采用数值模拟方法,基于Mein-Larson降雨入渗模型,提出了均质无限长非饱和土边坡在均匀降雨强度下,由于基质吸力的变化,导致土体强度指标的变化,从而发生边坡破坏的条件。结论表明,在降雨强度大于土壤的饱和渗透系数并且降雨持时满足一定的时间下,降雨才可能土坡失稳。In view of the slope instability due to rainfall in tropical and subtropical regions, the paper proposes a simple model to estimate slope stability under rain infiltration. In this paper, numerical simulation method is adopted. Based on Mein-Larson rain infiltration model, the essential conditions to homogeneous and infinite slope failure in unsaturated soils under uniform rainfall intensity are proposed. The change of matric sunction lead to the intensity index of soil changing, therefore resulting in slope slides. The research results show that if rain intensity surpasses the saturated coefficient of permeability of soil and the prolonged period of rainfall satisfies an essential time,the rain infiltration will lead to instability.

关 键 词：非饱和土 降雨入渗 Mein—Larson入渗模型 边坡稳定 

分 类 号：O357.3[理学—流体力学] P642.22[理学—力学]