【摘要】 基于Merchant粘弹性模型和简化双曲线模型,建立软土地基沉降的二维非线性粘弹性Biot固结有限元计算公式;根据最小二乘法建立目标函数,采用Simplex直接优化算法反演确定参数;为反演能获得在物理意义上合理且数学上唯一的参数,提出从简单模型到复杂模型的分步反演分析方法。实例分析表明,该方法是可行的。更多还原

【Abstract】 Two -dimensional formulas of nonlinear viscoelastic Biot’s consolidation FEM based on Merchant’s model and simplified hyperbolic model are presented to calculate settlement of saturated soft clay ground.Parameters in formulas may reasonably be determined by direct optimal method such as Simplex so that it minimizes the sum of squares of differences between calculated and measured quantities(objective function).The back-analysis step by step method is proposed to solve the well -posed problem of parameters’ back -analysis.In fact,it is a procedure of model identification from simplified to complicated,and it is a new idea to study nonlinear back-analysis.更多还原