降雨入渗下残积土坡失稳因素的敏感程度分析  

Sensitive degree of instable factors of residual soil slope under rainfall infiltration

作　　者：阙云[1] 胡昌斌[1] 姚晓琴[1] 

机构地区：[1]福州大学土木工程学院,福建福州350108

出　　处：《广西大学学报（自然科学版）》2009年第4期469-473,共5页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(50778045);福建省教育厅科研资助项目(JA08016);福州大学人才基金资助项目(XRC-0814)

摘　　要：以福州地区典型残积土为例,基于饱和—非饱和渗流理论,分析了降雨条件、土质物理力学参数、边坡几何形态等11种因素与边坡稳定性的关系,然后采用灰色关联法分析以上因素对于边坡稳定性的敏感程度与权重。结果表明:降雨条件下影响边坡稳定性的影响因素中,土体有效粘聚力和有效内摩擦角对边坡稳定性影响权重最大且相当;降雨强度是诱发残积土边坡失稳的重要因素,建议加强排水功能,减少降雨对边坡整体稳定性的影响;其余因素均对残积土边坡稳定性有较大影响,权重值大小相差不大。The relationship between eleven factors including precipitation condition, physical and mechanical parameters, geometry shape of slope and stability of residual soil slope are analyzed based on saturated-unsaturated flow theory. Then, the sensitive degree and weight of the instable factors on stability of residual soil slope were studied with grey correlation method. The calculation results show that the weight of effective cohesion and effective angle of internal friction are the largest. The rainfall intensity is an important inducing factor which leads to slope failure. So, it is necessary to strengthene drainage in slope treament. And other instable factors have large influence on stability of residual soil slope, and the weight of these factors were close.

关 键 词：降雨入渗 残积土坡 失稳因素 灰色关联法 

分 类 号：TU45[建筑科学—岩土工程]