行车荷载下半刚性基层沥青路面结构响应及参数分析  

Research on Structural Response and Parameter Analysis of Semi-rigid Base Asphalt Pavement Under Driving Load

作　　者：王胜难 WANG Shengnan(School of Highuay,Chang'an University,Xi'an 710064,China)

机构地区：[1]长安大学公路学院,西安710064

出　　处：《交通科技》2019年第1期7-10,共4页Transportation Science & Technology

摘　　要：文中将车辆荷载分为正向荷载和偏向荷载2种,并利用ABAQUS有限元软件建立基层含裂缝的沥青路面结构,重点对行车荷载下基层反射裂缝受力特性及其对参数敏感性进行分析,得到以下结论:正荷载和偏荷载作用下在路基面层裂缝位置处拉剪应力均发生突变,正荷载作用下基层反射裂缝因受压而不会扩展,而偏荷载是影响基层裂缝扩展的主要因素;正荷载下裂缝尖端的正应力及偏荷载下的裂缝尖端的正剪应力随着面层厚度和面层模量的增加而增大,随着基层模量的增加其应力减小;正偏荷载下的裂缝尖端张开型应力强度因子随面层厚度和面层模量的增加而增大,而随基层模量的增加而减小;偏荷载下的裂缝尖端剪切型应力强度因子随面层厚度和基层模量的增加而减小,随面层模量的增加而缓慢增加。In this paper,the vehicle load is divided into two types:forward load and bias load.The ABAQUS finite element software is used to establish the asphalt pavement structure with cracks in the base layer.The stress characteristics of the reflective cracks in the base layer under driving load and the sensitivity of the parameters are analyzed.The conclusions are as follows:under the action of positive load and partial load,the tensile shear stress at the crack location of the subgrade is abrupt.Under the normal load,the base crack will not expand due to the pressure,and the partial load will affect the crack propagation of the base,which is the main factors.It is also showed that the normal stress at the crack tip under positive load and the normal shear stress at the crack tip under partial load show a tendency to increase with the increase of the thickness of the surface layer and the modulus of the surface layer,and with the increase of the modulus of the base layer,otherwise the stress decreases.The crack-intensity stress intensity factor of the crack tip under positive partial load increases with the increase of the thickness of the surface layer and the modulus of the surface layer,and decreases with the increase of the modulus of the base layer.The crack-type stress intensity factor of the crack tip decreases as the thickness of the facing layer and the modulus of the base layer increase,and increases slowly as the modulus of the facing layer increases.

关 键 词：行车荷载 半刚性基层 沥青路面 结构响应 参数分析 

分 类 号：U416.217[交通运输工程—道路与铁道工程]