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为了从细观角度阐释级配碎石作为应力消散层对半刚性基层反射裂缝的作用机理,利用离散元方法生成未设置和设置级配碎石层沥青路面结构的细观模型,模拟了上述两种路面结构在标准轴载作用下的响应过程,得到了两种路面结构的接触力分布、最大接触力、应力集中区域的Y向平均应力和平均应变,以及集料颗粒的位移矢量。数值模拟结果表明:路面结构中产生的接触力主要沿荷载作用位置向下传递,设置级配碎石应力消散层后路面结构二中产生最大接触力比未设置级配碎石的路面结构一减小了6.1%,面层层底的平均应力、平均应变分别降低了11.79%,65.43%,集料的位移在路面表面附近最大,沿深度方向逐渐减小,路面结构一、二面层层底相同颗粒的位移分别为0.205 cm,0.126 cm,上述结果均体现了级配碎石对应力消散的效果。
In order to explain the action mechanism of the graded broken stone as the stress dissipation layer on the reflective crack of the semi-rigid basement from the microscopic point of view, the meso-scale model of the asphalt pavement structure without the graded broken stone layer is set up by the discrete element method. The contact force distribution, the maximum contact force, the Y-direction average stress and the average strain of the stress concentration area and the displacement vector of the aggregate particles are obtained through the response process of the pavement structures under the standard axial load. The numerical simulation results show that the contact force generated in the pavement structure is mainly transmitted downward along the load acting position. The maximum contact force in the pavement structure II after the grading of the graded-stone stress dissipation layer is set is smaller than that of the pavement structure without the grading broken stone The average stress and the average strain of the surface layer are reduced by 11.79% and 65.43% respectively. The displacement of the aggregate is the maximum near the surface of the pavement and gradually decreases along the depth. The pavement structure of the first and second layers The displacements of the same particles are 0.205 cm and 0.126 cm, respectively. The above results show the effect of graded gravel on stress dissipation.