降雨入渗条件下路堑边坡稳定性  

Stability of cutting slope under condition of rainfall infiltration

作　　者：王惠芸[1,2] 杨和礼[2] 刘磊[3] 赵颖[3] 

机构地区：[1]武汉工业学院电气信息工程系,湖北武汉430023 [2]武汉大学土木建筑工程学院,湖北武汉430072 [3]中国科学院武汉岩土力学研究所,湖北武汉430071

出　　处：《辽宁工程技术大学学报（自然科学版）》2008年第6期847-849,共3页Journal of Liaoning Technical University (Natural Science)

基　　金：国家自然科学基金资助项目(50874102);湖北省自然科学基金青年杰出人才资助项目(2007ABB039);地质灾害防治与地质环境保护国家重点实验室资助项目(GZ2006-03)

摘　　要：分析了降雨入渗对路堑边坡稳定性的影响机理和特性,以非饱和渗流理论为基础,建立了入渗条件下的流-固耦合数学模型及SWCC模型模型,并根据现场土质特性对广东某环城高速公路堑边坡在不同降雨强度下的坡内水压力和流速分布进行了预测,并计算得到了降雨入渗后的安全系数。结果表明:随着土体含水率增加,内摩擦角和粘聚力下降导致抗剪强度急剧下降,是边坡失稳的根本原因:随着降雨强度的增大,最小安全系数不断减小。The mechanism and characteristics of soil cutting slope of expressway under rainfall infiltration are presented. Based on the unsaturated seepage theory, the fluid-matrix model and SWCC model are built. The distribution of water pressure and fluid velocity, of cutting slope of GuangDong Expressway in different rainfall strength was evaluated and safety coefficient after rainfall is given. The results show as the moisture increased, the internal friction angle and cohesive strength decrease with shearing strength reduced, which is the prime reason of the slope. The safety coefficient decreases with rainfall strength increasing.

关 键 词：饱和-非饱和土 路堑 降雨入渗 边坡稳定性 

分 类 号：S152.7[农业科学—土壤学]