多重势面模型在低弹模混凝土防渗墙应力变形分析中的应用

采用应力型多重势面模型模拟低弹模混凝土的本构关系，模型参数选择邓肯E-B模型的参数，将土石坝混凝土防渗墙施工过程中槽孔开挖、泥浆固壁和混凝土回填作为一级荷载简化处理。利用自行开发的三维有限元程序对某土石坝工程进行计算，计算结果表明：简化处理结果能反应墙体施工影响，低弹模混凝土墙体采用多重势面模型的计算结果与邓肯E-B、线弹性计算结果具有一致的变化规律，在墙体与基岩交接处应力范围处于邓肯E-B模型与线弹性之间,应力曲线在墙体中下部更平滑。

Application of Multi-potential Surface Model to the Stress-deformation Analysis of Cut-off Wall with Low Elastic Modulus Concrete

A stress-type multi-potential surface model with the same model parameters as those of Duncan E-B model is adopted to simulate the constitutive relation of low elastic modulus concrete. Slot excavation, mud of firm wall and concrete backfill are simply taken as one grad of loads in the numerical simulation of construction process. A 3-D FEM code is used to compute stresses and deformation of a dam reinforcement engineering. The results show that the Stress and deformation change of construction process can be reflected by the simplified process and the same general trend of principal stress as Duncan E-B and linear elastic model is gotten by the stress computed by multi-potential surface model. The stress computed by multi-potential surface model is between the results of Duncan E-B model and the line elasticity model and the stress curve is more smooth more smooth in the mid-lower of wall.