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旧水泥混凝土路面加铺改造后主要破坏来自于旧水泥混凝土路面的反射裂缝,如何防止反射裂缝的发生也是旧水泥混凝土路面加铺改造的难点。为此,研究采用大碎石沥青混合料作为裂缝缓解层,对比分析了大碎石沥青混合料、密级配AC-20混合料、级配碎石与水泥稳定碎石4种不同加铺层的结构应力,采用有限元分析方法分析了在最不利荷载作用下,温度应力、荷载与温度应力耦合作用下以及加铺材料中的孔洞对加铺层底应力的影响,发现大碎石沥青混合料裂缝缓解层对防止反射裂缝的发生具有良好的作用。
After the renovation of the old cement concrete pavement, it mainly destroys the reflection cracks from the old cement concrete pavement. How to prevent the occurrence of the reflection cracks is also the difficulty in rebuilding the old cement concrete pavement. To this end, the study uses a large gravel asphalt mixture as a crack mitigation layer, comparative analysis of the large gravel asphalt mixture, dense graded AC-20 mixture, graded gravel and cement stabilized macadam 4 different overlay The influence of temperature stress, load and temperature stress on the stress of overlay at overburden was analyzed by finite element analysis method under the most unfavorable load. It was found that the effect of large gravel asphalt mixture Crack mitigation layer to prevent the occurrence of reflection cracks have a good effect.