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本文提出了一个考虑材料非线性的多层路面应力分析的有限单元法。材料的非线性参数采用三轴试验确定。非线性分析的方法,除采用一般的变刚度法之外,还采用了改进的BFGS法。实际计算表明,这个方法比变刚度法有更大的适用性。为验证非线性分析结果的正确性,我们将分析结果与利用足尺试验路面的实测位移值进行了比较,并同时与线性弹性理沦解作了对比。
In this paper, a finite element method for multi-layer pavement stress analysis considering material nonlinearity is proposed. The nonlinear parameters of the material were determined using triaxial tests. In addition to the general variable stiffness method, the nonlinear analysis method also uses an improved BFGS method. The actual calculation shows that this method has greater applicability than the variable stiffness method. In order to verify the correctness of the nonlinear analysis results, we compared the analytical results with the measured displacement values of the full-scale test road surface and compared it with the linear elastic solution.