沥青路面级配碎石层应力消散的细观研究

发布时间：2018-05-10 16:14

本文选题：道路工程 + 应力消散　；参考：《公路交通科技》2014年09期

【摘要】：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。
[Abstract]:In order to explain the mechanism of graded crushed stone as stress dissipating layer acting on reflection crack of semi-rigid base, a mesoscopic model of asphalt pavement structure with unset and set gradation gravel layer was built by discrete element method. The response process of the above two pavement structures under the action of standard axial load is simulated. The distribution of contact force, the maximum contact force, the Y-direction average stress and the average strain in the area of stress concentration are obtained. And the displacement vector of aggregate particles. The numerical simulation results show that the contact force generated in the pavement structure is mainly transmitted down the load position. The maximum contact force produced by pavement structure 2 after setting graded crushed stone layer dissipates is 6.1 less than that of pavement structure without graded crushed stone, and the average stress at the bottom of the surface layer is decreased. The average strain was reduced by 11.79 and 65.43, respectively. The displacement of the aggregate was the largest near the surface of the pavement and gradually decreased along the depth direction. The displacement of the same particles at the bottom of the two layers is 0.205 cm / m 0.126 cm respectively. The above results show the effect of graded crushed stone on stress dissipation.
【作者单位】：山西建筑职业技术学院;北京华路祥交通技术有限公司;
【分类号】：U416.217

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