基于现场湿度和损伤密度的固化土基层疲劳性能仿真

Simulation of Fatigue Performance of Stabilized Soil Road Based on Field Humidity and Damage Density

摘要:

为了有效分析固化土基层在现场湿度分布下的疲劳性能，构建了考虑现场湿度的固化土路面结构数值仿真计算框架。首先基于平衡基质吸力的求解和回弹模量的预估，实现了固化土路面结构内部由于应力依赖和湿敏性引起的材料非线性力学性能的表征；然后基于能量力学法和损伤力学理论构建了非饱和固化土基层疲劳性能仿真理论建模方法；最后利用Comsol Multiphysics软件分析程序中的PDE-FE方法实现了在湿度场和应力场耦合作用下的非饱和固化土基层疲劳性能仿真计算。结果表明，该数值仿真计算框架可以较好地实现固化土路面结构的疲劳仿真分析，能够考虑现场湿度分布的影响，从而得到固化土路面结构内部真实力学响应。

Abstract:

To effectively investigate the fatigue performance of stabilized soil base， a framework combining analytical models and numerical simulations that considers field humidity distribution was proposed in this paper. First， based on the solution of equilibrium matric suction and the estimation of the resilient modulus， the nonlinear mechanical properties of the material caused by stress dependence and moisture sensitivity inside stabilized soil roads were characterized. Subsequently， based on the energy-based mechanistic（EBM） approach and the damage mechanics theory， the fatigue performance simulation of unsaturated stabilized soil was constructed. Finally， the PDE-FE method in Comsol Multiphysics was used to conduct the multi-field coupling simulation analysis of the fatigue performance of unsaturated stabilized soil base. The results show that the framework proposed could effectively simulate the fatigue damage analysis of stabilized soil base under field humidity distribution.