强降雨条件下浙江武义平头村山体高边坡稳定性分析  

STABILITY ANALYSIS OF HIGH SLOPE SUBJECTED TO HEAVY RAINFALL IN PINGTOU VILLAGE OF WUYI COUNTY,ZHEJIANG PROVINCE

作　　者：吴李泉[1] 张锋[2] 凌贤长[2] 朱占元[2,3] 王立娜[2] 高霞[2] 

机构地区：[1]浙江科技学院建筑工程学院,浙江杭州310023 [2]哈尔滨工业大学路基与防护工程研究所,黑龙江哈尔滨150090 [3]四川农业大学信息与工程技术学院,四川都江堰625014

出　　处：《岩石力学与工程学报》2009年第6期1193-1199,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：浙江省科技支撑与引导计划项目(2008C23019)

摘　　要：基于饱和–非饱和渗流理论,综合考虑降雨入渗引起土体重量增加、渗透力增大以及抗剪强度降低等因素的影响,建立降雨条件下边坡稳定性分析有限元数值模拟模型,并开发出相应的计算程序USLOPE-FEM。以浙江武义平头村山体高边坡为例,研究强降雨入渗条件下边坡的瞬态渗流场与稳定性,根据获得任意时刻各节点的压力水头、应力和位移等,并分析强降雨中边坡的稳定性。研究结果表明,未降雨时,该边坡基本处于稳定状态;连续强降雨24 h,坡体浅层含水量显著增加,表层出现饱和区且零压面逐渐向内部推移,从而诱发局部滑塌,与实际发生的局部滑塌部位一致,由此验证了有限元分析模型和计算程序的可靠性。上述研究结果为强降雨条件下边坡稳定性分析与安全性评价提供了一般的技术思路和参考经验,也为该边坡的失稳预警与滑坡防治准备了必要的基础资料。Based on the theorem of saturated-unsaturated infiltration, the numerical model of slope stability subjected to rainfall is developed; and the codes named USLOPE-FEM are programmed to consider the influence of increase of gravity and infiltration forces and the decrease of shear strength. Taking a high slope in Pingtou Village of Wuyi County in Zhejiang Province for example, the transient seepage and stability of this slope subjected to heavy rainfall infiltration are simulated~ and the slope stability is quantitatively evaluated according to the transient pore water pressure, the stress and displacement. Numerical results show that the slope is stable in normal conditions; but after the heavy rainfall（magnitude of 20 mm/h） for 24 h, the increase of water content and the moving of zero pressure surface into slope will result in local collapsing. The results are in good agreement with the actual collapse, which verifies the reliability and rationality of the numerical model and program USLOPE-FEM. All above-achieved results are acceptable for evaluating the stability of slope subjected to heavy rainfall; and a general technique idea and references for slope treatment are also provided.

关 键 词：边坡工程 强降雨 高边坡 稳定性分析 饱和-非饱和渗流 

分 类 号：P642.22[天文地球—工程地质学]