摘要
探讨降雨入渗作用对人工填土斜坡稳定性的影响,能为避免降雨诱发滑坡提供一定的理论依据。本文以贵州省定东小学填土-坡积土斜坡为例,在分析人工斜坡体工程地质特征的基础上,利用有限元Geostudio软件多模块的耦合,分析了不同降雨条件斜坡的渗透场、应变场特征和稳定性,同时分析了前期与后期降雨和填土前后的稳定性。结果表明:人工填土斜坡体的地下水流速和最大剪应变均集中于填土与坡积土界面附近,且随降雨强度增加而增加;降雨强度和降雨持续时间与斜坡稳定性呈反比;填土因素一定程度上增强了降雨渗透对斜坡稳定性的影响,填土-坡积土界面为人工填土斜坡失稳的最大潜在滑动面;降雨前期对斜坡稳定性影响大于后期,且该效应随降雨强度降低而增强;降雨渗透是通过增加孔压、降低基质吸力、地下水流速增加引起剪应变增加等方式降低人工填土斜坡的稳定性。
The influence of rainfall infiltration on the stability of artificial fill-slope was discussed,which can provide a theoretical basis for avoiding geological disasters such as landslides caused by rainfall infiltration.Taking the fill-eluvium soil slope of Dingdong Primary School in Guizhou as an example,this paper analyzes the engineering geological characteristics of the slope.The various module coupling of the finite element software Geostudio is used to analyze the seepage field,strain field and stability of the slope under different rainfall conditions,and to analyze the slope stability of before-after filling and early-late stage of rainfall.The results show that:The groundwater flow velocity and maximum shear strain of artificial fill slope are concentrated near the interface between the filling soil and eluvium soil,and they increase with the increase of rainfall intensity;Rainfall intensity and rainfall duration are inversely proportional to the slope stability;The influence of rainfall seepage on slope stability is partly enhanced by filling factors,and the interface between filling and alluvial soil is the maximum potential slip surface for the instability of artificial filling slope;The effect of early-stage rainfall on slope stability is greater than late-stage rainfall,and this effect increases with the decrease of rainfall intensity;Rainfall seepage reduces slope stability of artificial fill by increasing pore water pressure,reducing matrix suction and increasing shear strain caused by increasing groundwater flow velocity.
作者
李华
史文兵
张华湘
LI Hua;SHI Wenbing;ZHANG Huaxiang(College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, China;Key Laboratory of Karst Environment and Geological Hazards of Ministry of Natural Resources, Guizhou University, Guiyang 550025, China;NO.104 Geological Team, Bureau of Geology and Mineral Resources of Guizhou Province,Duyun 558000, China)
出处
《贵州大学学报（自然科学版）》
2020年第3期30-35,共6页
Journal of Guizhou University:Natural Sciences
基金
贵州省科技厅科技平台及人才团队计划项目资助(黔科合平台人才[2017]5402号)
贵州省教育厅青年科技人才成长项目资助(黔教合KY字[2018]117号)资助
贵州大学引进人才科研项目资助(贵大人基合字[2017]77号)
贵州大学培育项目资助(黔科合平台人才[2018]5781号)。
