基于加速加载试验的沥青混合料刚度衰变规律研究
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摘要
为了较真实地揭示沥青混合料的刚度衰变规律,首先通过加速加载试验系统MMLS1/3对成型的沥青混合料标准试件进行了加速加载试验,然后利用材料试验系统MTS测试了不同加速加载次数下沥青混合料的回弹模量。进而提出了基于模量衰变的疲劳损伤变量,据此建立了基于加速加载试验的沥青混合料的刚度衰减模型与非线性疲劳损伤演化模型,并获得了相应的模型参数。由于试件周边的约束作用,加速加载试验条件下的刚度衰变规律与其他常见疲劳加载方式下的衰变规律在第三阶段略有不同,衰变速率呈现先增大后减小的现象。
In order to truthfully reveal the stiffness decay regularity of asphalt mixture,first,the accelerated loading test is conducted on the formed standard asphalt mixture specimens by accelerated loading test system MMLS1 /3,and the moduli of resilience of the asphalt mixture under different loading times are tested by materials testing system. Then,the fatigue damage variable based on modulus decay is proposed,the stiffness decay model and the nonlinear fatigue damage evolution model of asphalt mixture based on accelerated loading test are established accordingly,and the relative model parameters are obtained. Because of the effect of surrounding constraints on the specimens,the stiffness decay regularity under the condition of accelerated loading test is different from that of the common fatigue loading methods in the third stage during fatigue failure process,the decay rate increases at first,and then decreases.
In order to truthfully reveal the stiffness decay regularity of asphalt mixture,first,the accelerated loading test is conducted on the formed standard asphalt mixture specimens by accelerated loading test system MMLS1 /3,and the moduli of resilience of the asphalt mixture under different loading times are tested by materials testing system. Then,the fatigue damage variable based on modulus decay is proposed,the stiffness decay model and the nonlinear fatigue damage evolution model of asphalt mixture based on accelerated loading test are established accordingly,and the relative model parameters are obtained. Because of the effect of surrounding constraints on the specimens,the stiffness decay regularity under the condition of accelerated loading test is different from that of the common fatigue loading methods in the third stage during fatigue failure process,the decay rate increases at first,and then decreases.
引文
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[12]吕松涛.用真实应力比表征的老化沥青混合料疲劳性能[J].公路交通科技,2012,29(10):1-6.LSong-tao.Fatigue Performance of Aged Asphalt Mixture Characterized By Real Stress Ratio[J].Journal of Highway and Transportation Research and Development,2012,29(10):1-6.
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[14]钱国平,刘宏富,郑健龙,等.沥青混合料拉压疲劳损伤试验[J].公路交通科技,2012,29(3):1-6.QIAN Guo-ping,LIU Hong-fu,ZHENG Jian-long,et al.Experiment of Tension-compression Fatigue and Damage for Asphalt Mixture[J].Journal of Highway and Transportation Research and Development,2012,29(3):1-6.
[2]高爽.沥青混合料疲劳损伤机理研究[D].重庆:重庆交通大学,2008.GAO Shuang.Research on Fatigue Damage Mechanism of Asphalt Mixture[D].Chongqing:Chongqing Jiaotong University,2008.
[3]苑苗苗,张肖宁,陈伟强,等.沥青混合料疲劳失效判据探讨及验证[J].华南理工大学学报:自然科学版,2013,41(4):96-101.YUAN Miao-miao,ZHANG Xiao-ning,CHEN Weiqiang,et al.Investigation and Verification of Fatigue Failure Criterion of Asphalt Mixtures[J].Journal of South China University of Technology:Natural Science Edition,2013,41(4):96-101.
[4]朱洪洲,黄晓明.一种新的沥青混合料疲劳性能评价方法[J].公路交通科技,2005,22(2):4-6.ZHU Hong-zhou,HUANG Xiao-ming.Fatigue Model of Asphalt Mixtures Based on Damage Theory[J].Journal of Highway and Transportation Research and Development,2005,22(2):4-6.
[5]陈少幸,张肖宁,孟书涛,等.基于ALF加速加载试验的沥青层疲劳损伤[J].公路交通科技,2012,29(1):18-22.CHEN Shao-xing,ZHANG Xiao-ning,MENG Shu-tao,et al.Fatigue Damage in Asphalt Layer Based on ALF Accelerated Loading Test[J].Journal of Highway and Transportation Research and Development,2012,29(1):18-22.
[6]KUMAR T,CHEHAB G R.Methodology for Relating Accelerated Trafficking to Field Trafficking for Pavement Evaluation[J].KSCE Journal of Civil Engineering,2014,18(2):505-513.
[7]孙晓立,张肖宁,蔡旭.基于加速加载试验的微表处长期路用性能[J].同济大学学报:自然科学版,2012,40(5):691-695.SUN Xiao-li,ZHANG Xiao-ning,CAI Xu.Accelerated Test-based Study of Long-term Pavement Performance of Micro-surfacing[J].Journal of Tongji University:Natural Science Edition,2012,40(5):691-695.
[8]董忠红,徐全亮,吕彭民.基于加速加载试验的半刚性基层沥青路面动力响应[J].中国公路学报,2011,24(2):1-5,11.DONG Zhong-hong,XU Quan-liang,LPeng-min.Dynamic Response of Semi-rigid Base Asphalt Pavement Based on Accelerated Pavement Test[J].China Journal of Highway and Transport,2011,24(2):1-5,11.
[9]JTG E20—2011,公路工程沥青及沥青混合料试验规程[S].JTG E20—2011,Standard Test Methods of Bitumen and Bituminous Mixtures for Highway Engineering[S].
[10]吕松涛.老化沥青混合料粘弹性疲劳损伤特性研究[D].长沙:长沙理工大学,2008.LSong-tao.Research on Viscoelastic Fatigue Damage Characteristics of Aged Asphalt Mixture[D].Changsha:Changsha University of Science and Technology,2008.
[11]吕松涛.基于非线性疲劳损伤的沥青路面轴载换算[J].工程力学,2012,29(10):268-274.LSong-tao.Axle Load Conversion of Asphalt Pavement Based on Nonlinear Fatigue Damage[J].Engineering Mechanics,2012,29(10):268-274.
[12]吕松涛.用真实应力比表征的老化沥青混合料疲劳性能[J].公路交通科技,2012,29(10):1-6.LSong-tao.Fatigue Performance of Aged Asphalt Mixture Characterized By Real Stress Ratio[J].Journal of Highway and Transportation Research and Development,2012,29(10):1-6.
[13]郑健龙,吕松涛,田小革.基于损伤力学的沥青混合料疲劳寿命预估[J].中外公路,2005,25(3):94-98.ZHENG Jian-long,LSong-tao,TIAN Xiao-ge.Fatigue Life Forecast of Asphalt Mixture Based on Damage Mechanics[J].Journal of China&Foreign Highway,2005,25(3):94-98.
[14]钱国平,刘宏富,郑健龙,等.沥青混合料拉压疲劳损伤试验[J].公路交通科技,2012,29(3):1-6.QIAN Guo-ping,LIU Hong-fu,ZHENG Jian-long,et al.Experiment of Tension-compression Fatigue and Damage for Asphalt Mixture[J].Journal of Highway and Transportation Research and Development,2012,29(3):1-6.