降雨条件下滴水崖Ⅰ号滑坡瞬态稳定性分析  

Transient stability analysis of dishuiya landslide No.1 under rainfall condition

作　　者：尹小涛[1] 冉昌国[2] 王水林[1] 

机构地区：[1]中国科学院武汉岩土力学研究所岩土力学与工程国家重点试验室 [2]中交第二公路勘察设计研究院,武汉430056

出　　处：《岩土力学》2008年第2期501-506,共6页Rock and Soil Mechanics

基　　金：冻土工程国家重点实验室开放课题资助(No.SKLFSE200602)

摘　　要：根据选定的实测月降雨资料,利用径流渗流耦合理论,对滴水崖Ⅰ号滑坡进行了降雨入渗坡体渗流场数值计算。利用非饱和土强度理论,基于GLE通用条分法,分别利用天然状态强度参数和饱和状态强度参数计算了其安全系数,并对其稳定性进行了评价,为瞬态稳定性分析提供了基准。然后调用不同降雨时段的径流渗流计算结果对滑坡瞬态稳定性进行了计算和分析,研究了水分在坡体内的运移对滑坡稳定性的时间空间影响,同时分析了降雨入渗对坡体岩土渗透特性造成的影响和对坡面径流的影响。Utilizing seepage coupled slope surface runoff theory, the seepage field of Dishuiya Landslide No. 1 affected by the infiltrating process of rainfall is simulated according to the monitoring daily rainfall data in May. Based on generalized limit equilibrium method （ abbreviated. GLE）, the safety factor of the landslide is computed by means of unsaturated soil strength theory, respectively utilizing strength parameters under raw or saturated conditions. Simultaneously, its stability is evaluated, which offers a reference for transient stability analysis, Then, transient stability of the landslide is calculated and analyzed by metals of calling seepage and runoff results at different rainfall step. Moreover, the time and space effect of the landslide＇s stability caused by rainfall infiltrating into the slope body is explored. Meanwhile, soil hydraulic property and slope surface runoff affected by rainfall are presented.

关 键 词：滑坡 降雨 渗流 瞬态稳定性 

分 类 号：TU443[建筑科学—岩土工程]