地下水位变化对边坡稳定性影响的上限分析  

Analysis of Upper Bound of Slope Stability Considering Ground Water Level Fluctuations

作　　者：赵炼恒[1] 罗强[1] 李亮[1] 刘项[1] 张迎宾[1] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410075

出　　处：《公路交通科技》2010年第7期1-7,共7页Journal of Highway and Transportation Research and Development

基　　金：交通部西部交通建设科技项目(2006318802111);中南大学优秀博士学位论文扶植项目(2008yb004);铁道部科技研究开发计划重点资助项目(2008G0323);湖南省交通厅科技项目(200729)

摘　　要：坡体地下水水位变化引起坡内水力梯度的变化是导致边坡失稳的重要因素。通过将强度折减技术与极限上限定理结合,利用安全系数指标对地下水位变化影响下的均质边坡进行了稳定性分析,并进行了对比计算和参数分析。分析中将孔隙水压力当作外力,水位变化对边坡的影响作用通过虚功方程表现出来。对比计算表明:与已有结果的对比可以证明表明本文方法的正确性,且本文是较同类方法略好的上限解答;参数分析表明:坡内地下水位升降对边坡稳定性和潜在破坏面影响较大,地下水位上升引起孔隙水压力增大是坡体发生失稳的重要原因。The varying of hydraulic gradient in slope caused by ground water level fluctuations may result in slope failure. Based on the shear strength reduction technique and the limit analysis theory, the safety factor was used to assess slope stability for a given homogeneous slope under the condition of groundwater water level fluctuations, and the comparative calculation and parameter analysis were performed. The pore water pressure were considered as external force, and the presence of water can be considered through work terms in the energy-work balance equation. The case study and comparative analysis show that the solutions presented in this paper are better upper bound solutions and the validity of present method could be illuminated; （2） ground water level fluctuations have significant effect on the safety factor and the potential sliding surfaces of the slope, and large pore water pressures cause by elevation of groundwater level is the major cause of slope failure.

关 键 词：道路工程 边坡稳定性 地下水位变化 极限分析上限法 强度折减法 

分 类 号：U416.1[交通运输工程—道路与铁道工程]