[1]江祥林,钱振东,宋鑫.基于离散单元法的环氧沥青混凝土虚拟断裂试验研究[J].东南大学学报(自然科学版),2014,44(1):173-177.[doi:10.3969/j.issn.1001-0505.2014.01.031]
 Jiang Xianglin,Qian Zhendong,Song Xin.Experimental study on virtual fracture of epoxy asphalt concrete based on discrete element method[J].Journal of Southeast University (Natural Science Edition),2014,44(1):173-177.[doi:10.3969/j.issn.1001-0505.2014.01.031]
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基于离散单元法的环氧沥青混凝土虚拟断裂试验研究()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
44
期数:
2014年第1期
页码:
173-177
栏目:
交通运输工程
出版日期:
2014-01-18

文章信息/Info

Title:
Experimental study on virtual fracture of epoxy asphalt concrete based on discrete element method
作者:
江祥林12钱振东3宋鑫3
1长安大学公路学院, 西安610100; 2江西省桥梁检(监)测及加固重点实验室, 南昌330038; 3东南大学教育部智能运输系统工程研究中心, 南京210096
Author(s):
Jiang Xianglin12 Qian Zhendong3 Song Xin3
1 School of Highway, Chang’an University, Xi’an 610100, China
2 Jiangxi Key Laboratory of Bridge Test and Reinforcement, Nanchang 330038, China
3 Intelligent Transportation System Institute, Southeast University, Nanjing 210096, China
关键词:
环氧沥青混凝土 离散单元法 断裂模型 虚拟试验
Keywords:
epoxy asphalt concrete discrete element method fracture model virtual test
分类号:
U416.2
DOI:
10.3969/j.issn.1001-0505.2014.01.031
摘要:
为明晰环氧沥青混凝土的断裂力学行为特征,基于数字图像处理技术,采用离散元方法建立了切口小梁二维模型,开展了环氧沥青混凝土的虚拟弯曲断裂试验.从细观角度分析了环氧沥青混凝土断裂过程中的力学响应,探讨了其断裂机理及裂纹扩展路径,并与室内试验结果进行了对比.结果表明,采用离散元方法可较好地反映环氧沥青混凝土的断裂力学特性,数值模拟过程中虚拟试件的力学响应与理论结果相符.虚拟试验获取的材料强度参数与室内试验的测试结果接近,误差仅为0.25%,但前者所得的劲度模量因破坏挠度偏大,较后者低16.56%.在裂纹扩展过程中,破坏易产生于黏结较为薄弱的集料-砂浆界面.虚拟试验与室内试验的对比分析结果验证了离散元模型以及参数取值的正确性.
Abstract:
In order to clarify the fracture mechanical behaviors of epoxy asphalt concrete(EAC), a single-notched beam two-dimensional model was established by the discrete element method based on digital image processing technology. The virtual bending fracture tests of EAC were performed to study the mechanical response in the fracture process of EAC under meso-scale. The fracture mechanism and cracks propagation paths were analyzed and compared with the laboratory test results. The results show that the discrete element method can be used to exhibit the fracture characteristics of EAC excellently. The mechanical responses of the virtual tests obtained by numerical simulation are coincident with the theoretical results. The material strength parameters acquired by the virtual test are close to those of the indoor tests, with an error of 0.25%. However, the stiffness modulus obtained by the virtual test is 16.56% lower than the test results due to the large deflection. The damage tends to occur in the interface with inferior adhesive performance between the aggregate and asphalt mastic during the cracks propagation. The comparison between the virtual test results and the experimental results verify the availability of the discrete element model and the relevant material parameters.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期: 2013-07-12.
作者简介: 江祥林(1975—),男,博士生;钱振东(联系人),女,博士,教授,博士生导师,qianzd@seu.edu.cn.
基金项目: 国家自然科学基金资助项目(51178114)、江西省交通运输厅科技资助项目(2010C00005).
引用本文: 江祥林,钱振东,宋鑫.基于离散单元法的环氧沥青混凝土虚拟断裂试验研究[J].东南大学学报:自然科学版,2014,44(1):173-177. [doi:10.3969/j.issn.1001-0505.2014.01.031]
更新日期/Last Update: 2014-01-20