降雨模式对滑坡稳定性的影响  

Impact of Rainfall Pattern on Landslide Stability

作　　者：陈婷[1] 程圣国[1] 潘飞[1] 

机构地区：[1]三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌443002

出　　处：《水力发电》2014年第4期25-27,72,共4页Water Power

基　　金：国家重点基础研究发展计划(973计划)资助项目(2011CB013505)

摘　　要：结合三峡库区的降雨特征,利用有限元法模拟库区某滑坡在不同降雨模式下的暂态渗流场,利用极限平衡法研究降雨模式对该滑坡稳定性的影响。研究结果表明,降雨模式对滑坡土体的孔隙水压变化规律影响显著,递增型降雨模式下的滑坡的安全系数下降幅度最大,为最不利降雨模式;降雨对滑坡稳定性的影响有滞后性,降雨结束后滑坡安全系数仍持续下降,且与后期降雨强度有密切关系。Combined with Ihe eharacleristies of raintall in Three Gorges Reservoir area, the transient seepage fields of a landslide in this area in different rainfall patterns are simulated by using finite element method, and the impact of rainfall on slope stability is analyzedbyusinglimiteqnilibriummethod.The results show that： （a） the rainfall pattern has a significant impact on water migration of landslide body, and the safety factor of landslide continues to decline and had the largest decline under increasing rainfall pallern which is the most unfavorable rainfall pattern; and （b） the impact of rainfall on landslide stability is lagged behind the rainfall, and the landslide safety factor is still declining after the rainfall and the lag degree is closely related to later rainfall intensity.

关 键 词：降雨模式 入渗 孔隙水压 滑坡 稳定性分析 

分 类 号：P642.22[天文地球—工程地质学]