摘要
本文结合有限单元法和数学规划法提出一固结问题的反分析方法。该法可用于根据地基固结过程中测得的位移值和孔隙水压力值反算地基土的非线性模型的参数和渗透系数。论文中采用一个具有四参数的非线性弹性方程。然后,通过一些算例对该方法进行了验证。最后,采用该法对联邦德国一个土堤工程进行了反分析。根据土堤建设阶段的沉降观测资料确定了堤基土层的变形参数和渗透系数。
Firstly, combining the finite element method and the mathematical programming technique, a procedure of back analysis for consolidation problem is developed.The procedure can be used to estimate roughly parameters of nonlinear soil models and permeability of soil from some known displacements and porewater pressures during consolidation. A nonlinear elastic model with four parameters is advised in the paper. The validity of the procedure to determine the parameters of nonlinear elastic model and the permeability of soil has been verified by a hypothetical case studies. Finally, the material parameters of the subsoil of a dam in West Germany are estimated from the settlement of the dam during the construction with the developed procedure.
关键词
土
固结过程
力学参数
反分析法
Back analysis method,Nonlinear equation with four parameters,Normalized initial modulus, Permeability coefficient, The parametere of nonlinear elastic model.
