降雨及地下水位对三峡库区非饱和土边坡稳定性的影响  

Impacts from rainfall and groundwater table on stability of unsaturated soil slope within Three Gorges Reservoir Area

作　　者：刘东燕[1,2] 辜文杰[1,3] 侯龙[1] 

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045 [3]解放军后勤工程学院,重庆401311

出　　处：《水利水电技术》2013年第7期111-115,共5页Water Resources and Hydropower Engineering

基　　金：交通部西部交通建设科技项目(2009318000001)

摘　　要：选取三峡库区内的某处非饱和土边坡进行研究,分别在初始地下水位、降雨强度以及降雨持时不同的工况条件下分析边坡的稳定性能。研究结果表明:降雨强度是对边坡稳定性产生重要不利影响的因素之一,但不是决定性的因素;处于雨季的边坡稳定性能还要受到前期降雨持时和初始地下水位的控制。另外,在整个长持时降雨周期内,用于评判边坡稳定性能的安全系数值并不是单调变化的,而是先较快减少后逐渐趋于常数值。因此,可将对应于最低安全系数值的降雨持时称为临界降雨持时。The unsaturated soil slope at a location of Three Gorges Reservoir Area is selected for study, and then the slope stabil- ities under the operation conditions of the various initial groundwater tables, rainfall intensities and rainfall durations are respec- tively analyzed herein. The study results show that the rainfall intensity is one of the factors of the important unfavorable impacts on the slope stability, but it is not a determinate factor; nevertheless, the stability of the slope during rain-season is also domina- ted by the duration of the prophase rainfall and the initial groundwater table. Additionally, during the whole period of a long rain- fall duration, the safety factor for evaluating the slope stability is not monotonously changed, but is initially faster and then gradu- ally goes to be constant. Therefore, the rainfall duration corresponded to the minimum safety factor can be called as the critical rainfall duration.

关 键 词：降雨强度 降雨持时 非饱和土 地下水位 边坡稳定性 

分 类 号：X43[环境科学与工程—灾害防治]