双向循环荷载作用下长寿命沥青路面的剪应力分析

发布时间：2019-07-30 22:11

【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。
[Abstract]:Taking the long life asphalt pavement as the object, the shear stress of the long life asphalt pavement is analyzed and studied under the action of bidirectional cyclic load. the results show that the hysteretic curve of the working condition is approximately elliptical, and the strain value of the asphalt pavement increases with the increase of the cyclic displacement amplitude at the corresponding cyclic displacement amplitude. After cyclic loading, the strain value growth rate of C _ 2, C _ 3 and C _ 4 asphalt pavement is 86%, 80% and 52%, respectively. the larger the cyclic displacement value is, the smaller the strain value growth rate of asphalt pavement is. When the automobile slows down and accelerates the driving, the horizontal force obviously changes the maximum strain value of the top layer and the bottom of the upper layer of the asphalt pavement, and the alternating stress field in the pavement structure causes the fatigue failure of the pavement. The strain value of the bottom layer under the pavement in the vertical direction is the most affected. In the process of deceleration and acceleration, the transverse strain at the bottom of the lower layer increases with the increase of horizontal load, and in the surface layer, with the increase of depth, the transverse strain also increases. With the increase of horizontal load, the maximum value of longitudinal tensile strain at the bottom of the lower layer does not change obviously, but the transverse strain increases continuously. In the surface layer, the transverse strain increases with the increase of depth, and reaches the maximum at the bottom of the lower layer.
【作者单位】：广东石油化工学院;
【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)
【分类号】：U416.217

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