边坡稳定性分析中的有限元极限平衡法

Finite Element and Limit Equilibrium Method Applied on the Stability Analysis of Road Slope

从边坡稳定性有限元分析方法和极限平衡法基本原理入手,提出了适合于边坡稳定性分析的有限元极限平衡法.以浅变质岩边坡潜在滑动面上的切向和法向弹簧模拟滑坡体和滑床之间的接触摩擦问题,对某高速公路路堑边坡进行了数值模拟,分析了边坡内应力和变形特征,以及渐进破坏的发展过程,对传递系数法和有限元极限平衡法用于浅变质岩风化层边坡稳定性分析的计算结果进行了对比分析.结果表明,采用边坡潜在滑动面上的法向和切向弹簧单元模拟滑坡体和滑床之间的接触摩擦问题能够真实反映边坡潜在滑动面上应力重分配过程和特点,得到边坡失稳破坏的真实稳定安全系数,有限元极限平衡法分析边坡稳定性是一种有效可行的方法.

From the finite element analysis of slope stability and the basic principles of limit equilibrium method ,an appropriate method combined the finite element method with the traditional limit equilibri-um for the analysis of the slope was gained .The normal and tangitial spring element was first adopted to simulate the contacting problem between the slide body and bed ,the numerical simulation for a cer-tain slope was carried out ,the progressive failure process of the slope was analyzed according to the calculating results .The stability coefficient calculated by the transferring coefficient method for the slope was compared .From the researching results ,the following conclusion can be gained ：the normal and tangitial spring between the slide body and bed can authentically simulate the process of the stress reallocation on the potential sliding surface the slope ,and the true stability coefficient of the slope can be gained too ,the finite element method based on the limit equilibrium is an an effective and feasible method for the stability analysis of the slope .