Nonlinear Finite Element Analysis of Pavement Structural Stress

This paper suggests a finite element analysis method of the multilayer pavement with materials of nonlinearity. The triaxial test has been adopted to determine the nonlinear parameters. In the methods of nonlinear analysis, along with the normal variable stiffness methods, the improved BFGS method is used. Through calculations it is found that this method is more applicable than the variable stiffness method.In order to verify the correctness of the result of the nonlinear analysis, we have compared them with the measuring deflection value of the experimental pavement in full scale and at the same time with the results gained by solution of linear elastic theory.