摘要
降雨入渗是导致边坡失稳的重要因素,以某露天铁矿高陡边坡为研究对象,基于饱和-非饱和渗流理论和固-液耦合原理,采用有限元方法研究了正常水位和降雨入渗情况下边坡渗流场、孔隙水压、应力场和位移场的变化特点;采用修正的Mohr-Coulomb准则和二维通用条分法对边坡的稳定性进行了分析,研究表明,降雨入渗时,尽管边坡的安全系数降低不多,但坡体内最大剪应力增大到正常情况下的10倍,水平位移增大到正常情况下的4~5倍,临界滑面滑条上的最大孔隙水压增大到正常水位时的2倍,该研究可以为露天矿的边坡稳定性评价及其排水加固设计提供参考。
Rainfall infiltration is an important factor affecting slope stability.Based on saturated-unsaturated seepage theory of rock-soil medium and coupled analysis of solid-liquid,the features of seepage、pore-water pressure、stress field and displacement field of a high-steep slope in an iron open-pit mine is analyzed using the finite element method under two conditions-normal water level and rainfall infiltration;At the same time,modified Mohr-Coulomb strength criterion and 2-D limit equilibrium method are used to evaluate the stability of the slope.The results show that under rainfall infiltration,although the factor of safety decreased very little,the value of the maximum shear stress is about 10 times greater than that under normal water level condition,the displacement in x direction is about 4 to 5 times greater than that under normal water level condition,the maximum pore-water pressure on slices in slip surface is twice than that under normal water level condition.The research can provide theoretical evidence for evaluation of slope stability,drainage and reinforcement design of slopes.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2010年第15期39-43,共5页
Journal of Wuhan University of Technology
基金
国家重点基础研究发展计划(973计划)(2010CB731501)
关键词
边坡
降雨入渗
固液耦合
稳定性
slope
rainfall infiltration
coupled analysis
stability
