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车路相互作用下沥青路面材料弯曲破坏研究
Bending Failure of Asphalt Pavement Materials under Vehicle Road Interaction
投稿时间:2019-02-18  修订日期:2019-05-23
DOI:103969/j.issn.1007 9629202004025
中文关键词:  车路相互作用  沥青材料  离散元  弯曲破坏  裂缝扩展
英文关键词:vehicle road interaction  asphalt material  discrete element  flexural failure  crack propagation
基金项目:国家自然科学基金资助项目(11172183)
              
作者单位
高鹏永
GAO Pengyong
石家庄铁道大学机械工程学院,河北石家庄050043
School of Mechanical Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
陈恩利
CHEN Enli
石家庄铁道大学机械工程学院,河北石家庄050043
School of Mechanical Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
常伟锋
CHANG Weifeng
河北省曲港高速公路开发有限公司,河北定州050021
Hebei Qugang Expressway Development Co., Ltd., Dingzhou 050021, China
司春棣
SI Chundi
石家庄铁道大学交通工程结构力学行为与系统安全国家重点实验室,河北石家庄050043
State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
严战友
YAN Zhanyou
石家庄铁道大学交通工程结构力学行为与系统安全国家重点实验室,河北石家庄050043
State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures, Shijiazhuang Tiedao University, Shijiazhuang 050043, China
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中文摘要:
      为分析车辆荷载作用下沥青路面面层底部材料产生的弯拉破坏,构建了路面与二自由度1/4车辆的离散元相互作用模型,以计算在路面不平顺激励下的车路相互作用力和路面沥青材料的宏细观动态响应.另外,选取面层沥青材料进行弯曲破坏试验,得到了沥青材料在加载过程中裂缝产生和开裂时的应变场分布.在此基础上,应用PFC2D软件构建沥青材料离散元模型来模拟其加载破坏过程,以探究车路相互作用下沥青面层的弯曲细观破坏机理.研究发现:弹性阶段后,沥青材料内部开始出现微裂纹,随着车辆荷载增加,材料最薄弱区域的微裂纹汇集成宏观裂纹直至破坏;在一定数值范围内,沥青材料空隙率对其抗开裂性能影响较大.试验结果证实了数值模拟的准确性.
英文摘要:
      The bending damage of asphalt pavement bottom material under vehicle load was analyzed and the interaction discrete element model(DEM) of pavement and two degree of freedom quarter vehicle was constructed. The vehicle road interaction force under road irregular excitation was calculated and DEM model was used to calculate the dynamic response of asphalt pavement material at macro and micro scales. Bending failure experiments of surface asphalt material were carried out, and the strain field distribution of crack generation during asphalt loading was measured. The discrete element model of asphalt material was constructed by PFC2D, and the loading and failure process was simulated. The bending mesoscopic damage of the asphalt surface layer under the interaction of the vehicle and road was explored. It was found that after the elastic stage, micro cracks begin to appear in the asphalt material. As the vehicle load increase, the macro cracks converge in the weakest area of the material until failure. The numerical simulation was consistent with the experimental change trend. Results show that the voidage has a great influence on the cracking resistance of asphalt materials in a certain range of values.
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