透水性沥青混凝土路面力学响应分析

Analysis on Mechanical Response of Permeable Asphalt Concrete Pavement

针对典型透水性沥青路面结构,该文采用ABAQUS有限元方法,分别改变路面结构面层厚度、底基层厚度以及土基模量,分析路面力学响应,并对所研究的透水性沥青路面结构进行工程试验段应用。结果表明:透水性路面竖向位移随路面含水量的增加而减小;随着面层厚度的增加,路表弯沉和土基顶面压应变随之减小;增加透水性沥青路面底基层厚度可以有效改善路面力学状况;路表弯沉和土基顶面压应变受土基模量影响较大。因此,推荐透水性沥青混凝土路面的面层厚度应大于12cm,底基层厚度取20～40cm,在有条件的地方优先采用土基模量高的砂性土。

For the typical permeable asphalt pavement structure, this paper uses ABAQUS finite element method to change the surface layer thickness, subbase thickness and soil modulus of the pavement structure, analyzes the mechanical response of the pavement, and conducts engineering tests on the permeability of the asphalt pavement structure. The results show that the vertical displacement of the permeable pavement decreases with the increase of the water content of the pavement;with the increase of the thickness of the surface layer, the road surface deflection and the compressive strain of the top surface of the soil foundation decrease;the increase of the pavement base thickness can effectively improve the mechanical condition of the road surface;the deflection of the road surface and the compressive strain of the top surface of the soil are greatly affected by the soil modulus. Therefore, it is recommended that the thickness of the surface layer of the permeable asphalt concrete pavement should be greater than 12 cm, and the thickness of the base layer should be 20 cm to 40 cm. Sandy soil with high soil modulus is preferred in places where conditions permit.