解析法和有限元法在高边坡稳定性分析中的应用

摘要

Because of the complexity of the soil deformation and internal stress,the traditional limit equilibrium method failed to introduce the relationship between stress and strain has its own limitation.In order to solve the problem of slope instability of high-filled subgrade caused by the slope weight and external conditions,the high slope of subgrade on Binjiang East Road in Nanping City of Fujian Province is taken as the example to calculate the stability coefficient of high-filled slope by the numerical model of the analytical method and the nonlinear finite element method.The result shows that two methods are close,which can both make more accurate prediction and judgement on high slope stability.Finally,the stability of the high slope is comprehensively evaluated by the soil horizontal displacement of theory value and the measured value,which can provide an effective method for the design and construction of the same project.%由于土体内部应力与变形的复杂性,传统极限平衡法未能引入应力与应变关系而存在一定的局限性.为解决高填方路基边坡在自重及外界条件作用下,边坡失稳破坏的技术难题.以福建省南平市滨江东路路基高边坡为工程背景,分别采用解析法与数值非线性有限元法建立模型对高填方边坡的稳定系数进行计算,结果表明两种方法计算结果接近,都能较为准确地对高边坡稳定性做出预测和判定,最后结合土体水平位移理论值与实测值综合对该高边坡的稳定性进行了评价,这可为同类型项目的设计与施工提供一种行之有效的计算方法.