摘要
以麻柳林滑坡为例,选取了内摩擦角、粘聚力、渗透系数、浸没率、库水位下降速率及降雨量等6个因素进行了正交试验,采用极差分析法进行了稳定性敏感分析.结果表明,滑坡稳定性及其变化率主要由内因决定,库水和降雨对其影响较小.滑坡稳定性对内摩擦角最敏感,其次依次为渗透系数、粘聚力和浸没率.滑坡初始稳定性主要由内摩擦角和粘聚力决定.滑坡稳定性随浸没率的降低而逐步增加,但增幅较小;渗透系数对滑坡稳定系数变化率的影响最大,并存在临界值K_0,渗透系数大于K_0时,滑坡稳定性随渗透系数的增加而增加,渗透系数小于K_0时,滑坡稳定性随渗透系数的降低而降低.
Taken Maliulin landslide as a case,the friction angle,cohesive strength,hydraulic conductivity,immersion ratio,reservoir drawdown rate and rainfall are chosen as influential factors and orthogonal experiment was carried out.Sensitivity analysis was performed using range analysis.Results show that the stability of Maliulin landslide is mainly influenced by its self-factors,and the reservoir and rainfall have limited impact on landslide stability.Landslide stability is most sensitive to friction angle,followed by hydraulic conductivity,cohesive strength and immersion ratio.The initial landslide stability is mainly influenced by friction angle and cohesive strength.As the decreasing of immersion ratio,the landslide stability has limited increase.The changed ratio of factor of safety is mainly influenced by hydraulic conductivity in which a critical value K0 existed.When hydraulic conductivity is greater than K0,the landslide stability increases with the increasing of permeability coefficient.On the contrary,the landslide stability decreases with the decreasing of hydraulic conductivity when hydraulic conductivity is less than K0.
作者
刘毅
赵斌滨
殷坤龙
陈丽霞
桂蕾
梁鑫
Liu Yi;Zhao Binbin;Yin Kunlong;Chen Lixia;Gui Lei;Liang Xin(China Electric Power Research Institute Co. Ltd., Beijing 100055, China;Faculty of Engineering China University of Geosciences,Wuhan 430074,China;Institute of Geophysics & Geomatics,China University of Geosciences,Wuhan 430074,China)
出处
《地球科学》
EI
CAS
CSCD
北大核心
2019年第2期677-684,共8页
Earth Science
基金
国家自然科学基金资助项目(Nos.41572292
41601563
41641012
41572278)
国家重点研发计划(No.2018YFC0809400)
国家电网公司科技项目(No.GCB17201700121)
关键词
敏感性分析
正交设计
麻柳林滑坡
三峡库区
稳定性
sensitivity analysis
orthogonal design
Maliulin landslide
Three Gorges Reservoir
stability
