摘要
为探索夹层位置在加筋沥青混凝土加铺层中的抗开裂工作机理,首先分析沥青混凝土加铺层常见开裂形式及其产生机理,然后建立有限元模型,将夹层位置分为5种情况,同时考虑旧路有、无裂缝,研究了夹层位置对夹层上下沥青混凝土加铺层结构荷载内力及温度内力影响的规律。结果表明:在交通荷载作用下,随着格栅位置的上移,格栅之上加铺层的竖向剪应力存在一最小值,在此处对防治TDC开裂最佳,从抗反射裂缝及BUC开裂的角度来看,格栅夹层越靠近加铺层层底越有利;在温度荷载作用下,格栅设于加铺层层底,加铺层层底拉应力、拉应变及竖向剪应力最小,格栅设置与否并不影响格栅之上加铺层的拉应力、拉应变,从抗温度作用下的弯拉反射裂缝及BUC开裂的角度来看,建议将格栅设于加铺层层底。
In order to explore the anti-cracking work mechanism of interlayer position in the reinforced asphalt concrete overlay, the common cracking pattern and mechanism are firstly analyzed. Then the finite element model is established including 5 kinds of interlayer position. Simultaneously considering the old road with or without cracking, the effect of interlayer position on internal load stress and temperature stress of asphalt concrete overlay is studied. The results indicate that, under the traffic load, there is a minimum value of vertical shearing stress existing in the asphalt overlay above the grid with the moving up of the grid position, which is the best interlayer position to prevent and control TDC cracking. From the aspects of anti-reflective cracking and the BUC cracking, it is better to lay the grid near the bottom of asphalt overlay. Under the temperature load, the tensile stress, tension strain and vertical shearing stress are the smallest when the grid is laid at the bottom of asphalt concrete overlay. The grid doesn＇t affect the tensile stress and tensile strain of asphalt overlay above the grid. From the aspects of anti-temperature reflective cracking and the BUC cracking, it is suggested that the interlayer should be laid at the bottom of asphalt concrete overlay.
出处
《公路》
北大核心
2009年第4期109-113,共5页
Highway
基金
西部交通建设科技项目
项目编号200531881213
关键词
道路工程
沥青混凝土加铺层
有限元
开裂
夹层
road engineering
asphalt concrete overlay
finite element
cracking
interlayer
