兰州市某边坡治理设计有限元法计算分析

Calculation and Analysis on Design of a Slope Treatment in Lanzhou City by Finite Element Method(FEM)

结合兰州市某边坡地质灾害治理工程,通过对两个典型剖面进行有限元反分析计算,获得该边坡土体的抗剪强度指标。经过坡面修整后建立有限元模型进行3种工况的稳定性分析,根据未加固边坡塑性区应变大小和贯通变形区域面积,确定锚杆穿过塑性区的长度,通过加固后数值计算分析验证,判断其稳定性和加固效果满足工程要求。算例分析结果表明,该法使用简便,结果可靠,从而为边坡治理提供依据。

Combining with a slope geological hazard treatment project of Lanzhou city,the finite element inverse analysis calculation is carried out for two typical sections to achieve the shear strength indexes of this slope soil.The FEM model is established to analyze the stabilities of three conditions after the slope surface is treated.Based on the size of strain in the unreinforced slope plastic zone and the area through the deformation zone,the length passing through the plastic zone is determined.The calculation,analysis and validation of numerical numbers after reinforcement can judge its stability and reinforcing effect to satisfy the engineering requirements.The calculation and analysis results show that this method is easy to use and its result is reliable so as to provide the basis for the slope treatment.