承压水孔压的时空变化对边坡稳定性影响  

Effect of temporal and spatial variation of pore water pressure induced by confined groundwater on slope stability

作　　者：赵权利[1,2] 孙红月[3] 尚岳全[1] 王智磊[1] 

机构地区：[1]浙江大学建筑工程学院,浙江杭州310058 [2]长安大学地质工程与测绘学院,陕西西安710054 [3]浙江大学海洋科学与工程学系,浙江杭州310058

出　　处：《浙江大学学报（工学版）》2013年第8期1366-1372,共7页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(40972187);高等学校博士学科点专项科研基金资助项目(20100101110026);浙江省重点创新团队支持计划项目资助项目(2009R50050)

摘　　要：针对目前边坡稳定性分析中对承压水作用的模拟过于简化,导致分析方式不当的问题,提出用滑面附近孔隙水压力指示承压水的作用,分析承压水孔压的时空变化规律及其对坡体稳定性的影响.根据不同渗透条件下边坡稳定性计算结果分析,提出渗透系数比的概念,分析随渗透系数比的变化,枯水期孔压在空间维度上的具体分布及其所对应的边坡稳定性变化规律.分析在丰水期前缘有无堵塞的2种情况下,随降雨时间持续期的变化,滑面附近孔压的时空变化规律,以及其对边坡稳定系数的影响.对工程实例进行分析研究,结果表明丰水期边坡变形滞后于降雨及其产生的承压水作用.The present simulation of confined groundwater effect in slope stability analysis was too simplified to guarantee an appropriate analysis mode.Considering the problems above,this thesis proposed a concept of using pore water pressure near the slip surface to indicate this effect,and then analyzing the temporal and spatial variation laws of pore water pressure induced by confined groundwater and the consequent influence on slope stability caused by this variation.According to the analysis of slope stability results under different permeability conditions,the concept of seepage coefficient ratio was proposed,and the spatial distribution of pore water pressure in dry season with various seepage coefficient ratios was analyzed,and then the variation laws of slope stability corresponding to different seepage coefficient ratio was obtained.Under two conditions including the permeable layer blockage condition and non-block condition at front edge in wet season,the temporal and spatial variation laws of pore water pressure and effect on the slop stability factor caused by the variation with different rainfall duration were analyzed.Engineering practice was analyzed,the results show that the displacement of slope in wet season lags behind the rainfall and the variation of confined groundwater.

关 键 词：承压水 边坡稳定性分析 渗透系数比 孔隙水压力 工程实例 

分 类 号：P642.22[天文地球—工程地质学]