基于应力相关回弹模量模型的路面设计研究

Study on Pavement Design Based on the Stress-dependent Resilient Modulus Model

基于路基路面协调变形,建立三维有限元分析模型。在土基层采用具有应力相关的动态回弹模量Uzan模型,对典型水泥混凝土路面结构的荷载应力进行计算,并根据Uzan模型的参数对路基变形计算的影响进行了讨论,通过与静态回弹模量的对比,揭示不同路基回弹模量模型对路基土应力应变行为的影响。有限元分析结果显示,随着轴重和轴型的增加,路基工作区深度不断扩展,多轴荷载应力的叠加效应在路基深层愈加显著;采用应力相关的回弹模量与线弹性回弹模量相比,路基的竖向位移更大,承担的载荷压应力略小,工作区深度有所增加。

Based on the principle of coordinate deformation,the 3D finite element model was established and Uzan model was used to simulate the resilience modulus of the typical subgrade layer. Then the subgrade deformation affected by changing the parameter of the Uzan model and the different stressstrain behavior compared to the use of static resilience. The result of calculation shows that the depth of subgrade workspace expand rapidly with the gear weight and the number of axis getting larger,the stress induced by multi-axis load always exceeds the single one,and the overlap effect in deep subgrade is more significant.