基于有限元ANSYS的半刚性基层沥青路面力学响应分析

Mechanical Response Analysis of Semi-rigid Asphalt Pavement Based on Finite Element ANSYS

为解决乌鲁木齐市城市道路半刚性基层沥青路面横、纵向裂缝和车辙病害严重的问题,选取乌鲁木齐市城市道路典型的半刚性基层沥青路面结构,对面层厚度、基层模量以及基层厚度进行规律性的变化,研究沥青路面结构在不同行车荷载作用下的力学分布及变化规律。利用ANSYS有限元软件对不同行车荷载作用下的半刚性基层沥青路面结构进行仿真计算,并对提取的数据进行分析。结果表明:随着沥青路面厚度的增加,沥青层拉应力和剪应力均逐渐减小,但减小幅度却各有不同;随着半刚性基层厚度的增加,沥青层拉应力和剪应力均逐渐减小,且减小幅度均较小;随着半刚性基层模量的增加,竖向位移和沥青层剪应力均逐渐减小。因此,建议沥青面层在18~20 cm取值,半刚性基层厚度在35~40 cm取值,半刚性基层模量在1500~1600 MPa取值。

The research aims to solve the serious problems of transverse and longitudinal cracks and rutting on semi-rigid base asphalt pavement of urban roads in Urumqi,Xinjiang Province.Firstly,the typical semi-rigid base asphalt pavement structure of urban roads in Urumqi was selected to make regular changes in surface layer thickness,base modulus and base layer thickness.Then,the mechanical distribution and change rules of asphalt pavement structure under different driving loads were analyzed.Moreover,ANSYS finite element software was used to simulate the semi-rigid base asphalt pavement structure under different driving loads,and the extracted data were analyzed.The following results are got from the research.With the increase of the asphalt surface thickness,the tensile stress and shear stress of the asphalt layer are gradually reduced,but the reduction amplitude is different.With the increase of the thickness of the semi-rigid base layer,the tensile stress and shear stress of the asphalt layer gradually decrease,and the reduction range is small.With the increase of the modulus of semi-rigid base,the vertical displacement and shear stress of asphalt layer decrease gradually.Therefore,it is suggested that the value of asphalt surface layer should be between 18~20 cm,the thickness of semi-rigid base layer should be between 35~40 cm,and the modulus of semi-rigid base layer should be between 1500~1600 MPa.