沥青混合料断裂数值模拟进展

发布时间：2018-12-31 17:01

【摘要】：以沥青混合料为建筑材料的沥青路面是我国高等级公路的主要铺面形式,裂缝是造成沥青路面破坏的主要原因之一。研究沥青混合料的开裂机理有助于优化沥青混合料的设计,提高其抗裂性能。数值模拟是研究沥青混合料断裂的有效手段。但是,由于沥青混合料组成材料的多相性和细观结构的不均匀性,沥青混合料的断裂模式非常复杂。尽管目前断裂力学理论和数值模拟手段取得了很大进步,沥青混合料的断裂模拟问题还处于探索阶段。本研究总结了基于经典断裂力学理论的有限元方法、内聚力模型的有限元方法、细观结构模型的有限元方法和细观结构模型的离散元方法在沥青混合料断裂模拟中的应用和取得的成果。在分析各种数值模拟方法优劣的基础上,展望了今后的研究重点。在有限元方面,建议进一步研究基于沥青混合料三维细观结构的有限元方法,重点解决三维细观结构构建、计算收敛性和单元畸变问题。在离散元方面,建议进一步研究基于沥青混合料三维细观结构的离散元方法,重点解决计算效率和细观断裂本构模型问题。
[Abstract]:Asphalt pavement with asphalt mixture as building material is the main pavement form of high grade highway in our country. Crack is one of the main causes of asphalt pavement damage. Studying the cracking mechanism of asphalt mixture is helpful to optimize the design of asphalt mixture and improve its crack resistance. Numerical simulation is an effective method to study the fracture of asphalt mixture. However, the fracture mode of asphalt mixture is very complex due to the heterogeneity of the composition of asphalt mixture and the heterogeneity of meso structure. Although great progress has been made in the theory of fracture mechanics and numerical simulation, the problem of asphalt mixture fracture simulation is still in the exploration stage. In this paper, the finite element method based on classical fracture mechanics and the finite element method of cohesive force model are summarized. The application and achievement of finite element method and discrete element method of meso-structure model in asphalt mixture fracture simulation. On the basis of analyzing the merits and demerits of various numerical simulation methods, the future research emphases are prospected. In the aspect of finite element, it is suggested that the finite element method based on the three-dimensional mesoscopic structure of asphalt mixture should be further studied to solve the problems of the construction of three-dimensional mesoscopic structure, the calculation of convergence and element distortion. In the aspect of discrete element, it is suggested to further study the discrete element method based on three-dimensional mesoscopic structure of asphalt mixture, with emphasis on solving the problems of computational efficiency and mesoscopic fracture constitutive model.
【作者单位】：重庆交通大学交通土建工程材料国家地方联合工程实验室;南京工业大学道路工程研究所;
【基金】：国家自然科学基金项目(51608266) 中国博士后科学基金项目(2016M590448) 重庆交通大学交通土建工程材料国家地方联合工程实验室开放基金项目(LHSYS-2014-011)
【分类号】：U414

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