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路面脱层主要由剪切破坏引起，为了分析路面层间剪应力的影响因素，结合北京市气候和交通条件，建立了北京市高速公路典型路面结构的力学模型。利用ABAQUS软件对不同温度、竖向荷载、水平力系数、面层厚度、层间黏结状态等因素综合作用条件下层间剪应力的变化进行了正交仿真分析，确定了层间黏结状态为影响层间剪应力的最显著影响因素，并计算得到常温条件下的代表性剪应力。为了确定北京市高速公路沥青路面的最佳层间处置措施，利用课题组开发的基于上、中面层复合结构的剪切疲劳试验方法，制作典型上面层(SMA-13)、中面层(AC-20)及层间黏结材料(SBS改性沥青、橡胶改性沥青、SBS橡胶复合改性沥青、改性乳化沥青)的复合结构模型，以常温下的代表性剪应力作为控制应力进行了剪切疲劳试验，确定了上述黏层材料的最佳用量，并对各黏层材料进行了对比评价。相关结论对于上、中面层层间脱层和上面层网裂的进一步治理具有重要的理论意义和实际参考价值。
Abstract：Pavement delamination is usually caused by shear failure. In order to analyze the influence factors of pavement interlayer shear stress,the mechanical model of typical pavement structure of Beijing Expressway is established combined with the climate and traffic conditions in Beijing. The variation of shear stress between layers under the comprehensive action of different temperature,vertical load,sideway force coefficient,surface thickness and interlayer bonding conditions is analyzed by orthogonal simulation using ABAQUS software. It is found that the interlayer bonding state is the most significant factor affecting the interlaminar shear stress. The representative shear stress at normal temperature is calculated. In order to determine the best interlayer treatment measures for Beijing Expressway asphalt pavement,the composite structure models of typical upper layer( SMA-13),middle surface layer( AC-20) and interlayer bonding materials( SBS modified asphalt,rubber modified asphalt,SBS rubber composite modified asphalt,modified emulsified asphalt) were made based on the shear fatigue test method developed by the research group. The representative shear stress at normal temperature was taken as the control stress. The optimum amount of the above-mentioned tack coat materials was determined and the comparison and evaluation of each material was carried out by fatigue test with the representative shear stress at normal temperature as the control stress. The relevant conclusions have important theoretical significance and practical reference value for the further treatment of layer delamination and upper layer network crack.
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基本信息:
DOI：10.19740/j.2096-9872.2022.04.01
中图分类号:U416.217
引用信息:
[1]徐世法,刘钟达,房聪等.沥青路面层间剪应力仿真分析及黏结效果评价[J].北京建筑大学学报,2022,38(04):1-8.DOI:10.19740/j.2096-9872.2022.04.01.
基金信息:
国家自然科学基金项目(51978034); 北京学者基金项目(NO.067); 北京建筑大学研究生创新项目(PG2021036)