基于弹性理论的沥青路面Top-Down开裂机理研究

发布时间：2018-05-28 00:41

本文选题：道路工程 + 沥青混凝土路面　；参考：《公路交通科技》2014年04期

【摘要】：为了分析沥青混凝土路面Top-Down开裂机理,基于ABAQUS有限元分析方法,综合考虑老化和温度梯度造成的沥青路面内部模量梯度、突然降温、轮胎边缘的应力集中等因素,选取春季、夏季和冬季3个季节,及未老化缓慢降温、老化后忽然降温和老化后缓慢降温3种情况,建立了9个沥青混凝土路面结构有限元模型。对不同工况下沥青混凝土路面最大拉应力和剪应力的大小及位置进行了分析。结果表明:对于未老化缓慢降温和老化后缓慢降温的沥青混凝土路面,剪应力过大是沥青混凝土路面开裂的主要原因;对于老化后忽然降温的沥青混凝土路面,由于剪应力无明显变化,拉应力增加较多,拉应力过大是沥青混凝土路面开裂的主要原因。
[Abstract]:In order to analyze the Top-Down cracking mechanism of asphalt concrete pavement, based on ABAQUS finite element analysis method, considering the internal modulus gradient of asphalt pavement caused by aging and temperature gradient, sudden cooling and stress concentration on the edge of tire, spring is selected. In summer and winter, 9 finite element models of asphalt concrete pavement structure were established. The maximum tensile stress and shear stress of asphalt concrete pavement under different working conditions are analyzed. The results show that the main reason of cracking of asphalt concrete pavement is that the shear stress is too large for the asphalt concrete pavement which is not aging slowly and slowly cooling down after aging, and for the asphalt concrete pavement with sudden cooling after aging, the main reason for cracking of asphalt concrete pavement is excessive shear stress. Because the shear stress has no obvious change, the tensile stress increases more, and the excessive tensile stress is the main reason for the cracking of asphalt concrete pavement.
【作者单位】：杭州市公路管理局;长安大学公路学院;山东凯文科技职业学院;
【基金】：浙江省交运运输厅科技项目(2010H55) 陕西省交通运输厅科技项目(12-13K)
【分类号】：U416.217

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