基于承载板试验的粒料层非线性弹性参数反算方法

提出了一种基于现场承载板试验的粒料层非线性弹性参数的反算方法,即根据路面粒料层表面上承载板试验时逐级加载测试的弯沉,应用非线弹性有限元方法和改进的非线性最小二乘法反算粒料层的非线性弹性模型参数,并针对反算过程中的缺陷提出了修正方法.在此基础上研制了粒料层非线性弹性参数反算软件,并将粒料层非线性计算的理论弯沉与现场承载板试验的实测弯沉进行对比,论证了所提反算方法的合理可行性.

Back-calculation method of nonlinear elastical parameters of granular layer based on the bearing-plate test

A back calculation method of nonlinear elastical parameters of granular layer is proposed based on the bearing-plate test. Based on the deflection obtained with progressive- ly loading during bearing plate test, we use nonlinear finite element method and the im- proved nonlinear least squares method to back calculate nonlinear elastical model parameters of granular layer,and propose a correction method for the defect of back-calculation. On this basis we develop a software to back calculate the nonlinear elastical parameters of granular layer. At the same time,comparing deflection of the granular layer calculaed by nonlinear theory with the measured deflection on the bearing-plate test, we demonstrate reasonable feasibility of the back-calculation method.