| 沥青路面多裂纹断裂分析 |
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| 引用本文： | 徐文胜,朱宏平,罗辉.沥青路面多裂纹断裂分析[J].华中科技大学学报(城市科学版),2008,25(4). |
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| 作者姓名： | 徐文胜 朱宏平 罗辉 |
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| 作者单位： | 1. 华中科技大学土木工程与力学学院,湖北,武汉,430074
2. 华中科技大学控制结构湖北省重点实验室,湖北,武汉,430074 |
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| 基金项目： | 国家自然科学基金(10672063):武汉市建设科研计划资助项目 |
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| 摘 要： | 沥青路面通常在表面裂纹和基础裂纹共存状况下服务。基于断裂力学理论,采用无网格伽辽金/有限元耦合法,对同时含有面层表面裂纹和基层底面裂纹的沥青路面进行了断裂分析,研究了行车荷载行驶过程中裂纹尖端应力强度因子的变化规律。结果显示,在车轮荷载行驶通过基层底面裂纹上方的过程中,基层底面裂纹的复合型应力强度因子K＊存在一个最大极值,且这个最大值不是出现在车轮荷载位于基层正上方的时候;表面裂纹的应力强度因子K1和K2随着交通荷载驶近表面裂纹而逐渐增大,而且增大的速率也逐渐上升;相对于基层底面裂纹,表面裂纹受荷载位置影响更显著。
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| 关 键 词： | 沥青路面 断裂分析 无网格伽辽金/有限元耦合方法 应力强度因子 |
Fracture Analysis of Asphalt Pavements with Multiple Cracks Based on the Coupled EFG and FE Method |
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| XU Wen-sheng,ZHU Hong-ping,LUO Hui.Fracture Analysis of Asphalt Pavements with Multiple Cracks Based on the Coupled EFG and FE Method[J].Journal of Huazhong University of Science and Technology,2008,25(4). |
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| Authors: | XU Wen-sheng ZHU Hong-ping LUO Hui |
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| Abstract: | Asphalt pavements usually serve with both asphalt overlay crack and base crack.The fracture analysis of asphalt pavements with both cracks is done to investigate the rule of the stress intensity factor(SIF) at crack tips based on fracture mechanics by using the coupled element free Galerkin(EFG) and finite element(FE) method.The results show that mixed-mode SIF at the base crack tip exits an maximal extremum at the process that wheel loads moving over across the base crack,futhermore,this extremum is not produced when the load is right over the base crack;the mode I and mode II of SIFs at the overlay crack ascend in an increscent rate with wheel load moving close the overlay crack;the SIF at the overlay crack is more sensitive to the position of wheel load than that at the base crack. |
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| Keywords: | asphalt pavement fracture analysis coupled element free Galerkin(EFG) and finite element(FE) method stress intensity factor(SIF) |
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