路基压实粉质黏土动态回弹模量的四参数预估模型及有限元实现

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Abstract The factors affecting dynamic resilient modulus of subgrade compacted silty clay were investigated with dynamic tri-axis tests to analyze the dependency of dynamic resilient modulus on deviator stress and body stress. Through the two-factor regression analysis, an improved prediction model with four parameters was proposed by introducing k4 on the basis of AASHTO-N37A dynamic resilient modulus prediction model. In order to apply the improved model in finite element calculation, the accurate consistent tangent stiffness matrix of this model was derived based on the general Hooke law. The improved model was transplanted into the FE software ABAQUS by compiling the user material subroutine (UMAT), the computation validation was made under conditions of a single soil element and a subgrade-pavement structure. The results showed that the four-parameter improved model can better predict the dynamic resilient modulus of silty clay under different compaction levels; the soil body element’s stress-strain relation calculated with the improved model developed secondarily agreed well with the analytical solution; the improved model being applied in the analysis of subgrade-pavement structure can reflect differences of the dynamic resilient modulus at different locations of subgrade due to different stresses, and also reflect evolution of the dynamic resilient modulus under vehicle loading to realize the dynamic coupling between stress states and dynamic resilient modulus. The study provided a more actual numerical simulation method for design of subgrade-pavement structures.

Key words： subgrade silty clay dynamic resilient modulus prediction model consistent tangent stiffness matrix finite element (FE) realization

Received: 15 December 2016 Published: 28 April 2018

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2018/V37/I9/61

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