路堑边坡位移与失稳反分析应用与问题

反分析方法为岩体力学参数的获取提供了较为有效的途径,本文对岩体参数的反分析方法进行了一些研究,从动态设计和信息施工的角度出发,以现场量测信息为基础,建立了有限元位移反分析的方法,并把反分析与正分析结合来进行预测预报。本构模型是岩体参数反分析的一个重要方面,合适的模型可使参数确定变得容易。对具体边坡工程的实例,本文采用Duncan-Chang本构模型,以位移为反演依据,反分析了边坡模型中的粘聚力和内摩擦角两个参数,并把反演的参数带入正分析模型,计算下一阶段的位移,为工程的预测预报提供理论依据。

Application and Problem of FEM Back Analysis from Displacement and Instability in Cutting Slope

Back-analysis is a good method to get parameter of rocks and soils.A research on the method of back analysis parameter for rock is made.From the angle of dynamic design and information construction,a FEM displacement back analysis method which is based on the monitor information is found in this paper.Back analysis and normal analysis is combined for prediction.A constitutive model is very important part for parameter back analysis.A fitting constitutive model can make it easily ascertain the parameter.The Duncan-Chang constitutive model is used in cutting slope engineering in this paper.Based on the displacement,the cohesion and the angle of friction of the model are back analyzed,and then the result is inputted to the normal model to predict the displacement of next stage.These provided base for the engineering prediction.