土基模量的非线性反演分析

Analysis on backcalculation of subgrade modulus non linearity properties

在进行路面结构层模量反演时 ,如果忽略土基模量的非线性反应特性 ,而按线性特性反演 ,将使得土基模量偏大 .因此采用一简单的非线性土基模型 ,基于系统识别原理对土基模量进行反演、分析 .正问题采用轴对称四边形剖分有限元方法计算 ,并同BISAR计算结果进行比较 ;反问题针对蓝派冲击压实的工程实际 ,采用非线性模型进行模量反算 ,对其压实效果进行分析、评估 。

At present, most of backanalysis theries are based on multi layered linear elastic hypothesis, whose nonlinear characteristic is ignored. This often makes the moduli of the subgrade bigger than the actual value. So a nonlinear model of subgrade is given. Based on finite element method (FEM) and system identification method, some data are analyzed. The effect is satisfactory.