土钉支护边坡极限平衡法与有限元法对比分析

Comparative Analysis of Ultimate Equilibrium and Finite Element Method for Soil Nail Support Slope

极限平衡法(LEM)与有限元法(FEM)是边坡稳定性分析中最常用的两种方法,通过加固边坡稳定性分析,对比分析极限平衡法和有限元法之间存在的不同点,对45°及60°这两种坡度进行分析,分别在0°,15°和30°三种不同坡度下用钉子加固,坡度和所有的钉子倾斜都是从水平面上取的。本案例对安全系数、临界滑动面和钉轴力等稳定性参数进行了对比,研究了有限元分析中的极限平衡键长、土钉相互作用和抗弯刚度等参数的影响。采用极限平衡法,在45°斜坡和所有土钉倾斜时,土钉轴力较大;而对于60°斜坡,有限元法显示土钉轴力增加。分析结果表明,两种方法的破坏面差异很大,与有限元法相比,极限平衡法安全系数更高。

Limit equilibrium method(LEM)and finite element method(FEM)are the two most commonly used methods in slope stability analysis.The differences between limit equilibrium method and finite element method in the stability analysis of reinforced slopes are revealed.Two slopes of 45°and 60°were analyzed and reinforced with nails at three different slopes of 0°,15°,and 30°respectively.The slopes and inclinations of all nails were taken from a horizontal plane.A comparative study was conducted on stability parameters such as safety factor,critical sliding surface and nail axis force,and the effects of parameters such as limit equilibrium bond length,soil nail interaction and bending stiffness in finite element analysis were also studied.Using the limit equilibrium method,significant axial force of soil nails was observed on a 45°slope and all soil nails tilted,while for a 60°slope,the finite element method showed an increase in axial force of soil nails.The analysis results show that the failure surfaces of the two methods differ greatly,compared with the finite element method,the limit equilibrium method has a higher safety factor.