双向循环荷载作用下长寿命沥青路面的剪应力分析  

Shear Stress Analysis of Long Life Asphalt Pavement under Biaxial Cyclic Loading

作　　者：王志刚[1] 

机构地区：[1]广东石油化工学院,广东茂名525000

出　　处：《公路工程》2017年第3期77-81,共5页Highway Engineering

基　　金：国家自然科学基金(11272124);广东省科技计划项目(2012B031000023);广东省自然科学基金项目(2014A030307026);茂名市科技计划项目(201334)

摘　　要：以长寿命沥青路面为对象,在双向循环荷载作用下,对其路面所受剪应力进行分析研究,结果表明,工况滞回曲线均呈近似椭圆形,沥青路面应变值在对应循环位移幅值处,随循环次数增加而增大。在循环加载结束后,工况C2、C3、C4沥青路面应变值增长率分别为86%、80%、52%,循环位移幅值越大,沥青路面应变值增长率越小。汽车在减速和加速行驶时,水平力施加明显改变了沥青路面上面层顶部和上面层层底的最大应变值,路面结构内部交变应力场造成路面发生疲劳破坏。路面下面层层底在竖直方向应变值所受影响最大。车辆在减速和加速过程中,下面层层底横向的应变随着水平荷载的增加而增加,在面层里,随着深度的增加,横向应变也随之增加。随着水平荷载的增加,下面层层底的纵向拉应变的最大值变化不明显,横向应变不断增加,在面层里,横向应变随着深度的增加而不断增加,在下面层底部达到了最大值。In this paper,long-life asphalt pavement as the object,in the two-way cyclic loading,the pavement shear stress were analyzed. The results show that the condition of hysteretic curves are approximately elliptic,asphalt pavement strain values in the corresponding cyclic displacement amplitude,and increases with the increase of number of cycles. After the cyclic loading,the strain rate of C2,C3 and C4 asphalt pavement is 86%,80% and 52% respectively,the larger the cyclic displacement amplitude is,the smaller the strain rate of asphalt pavement is. The horizontal force exerted on the top layer of asphalt pavement and the maximum strain value at the top layer and the bottom layer were changed obviously when the vehicle was slowing down and speeding up,and the internal alternating stress field of pavement structure was the result of fatigue damage. The bottom layer of the pavement is affected by the vertical strain value. In the process of deceleration and acceleration,the lateral strain of the bottom layer increases with the increase of the horizontal load. In the surface layer,with the increase of the depth,the transverse strain increases with the increase of the horizontal load. With the increase of horizontal load,the bottom layers of the longitudinal tensile strain of the maximum does not change significantly,the transverse strain increasing in the surface layer,the transverse strain increased with increasing depth,reached a maximum in the bottom layer.

关 键 词：双向循环荷载 沥青路面 剪应力 路面结构 

分 类 号：U414.1[交通运输工程—道路与铁道工程]