MLS66重载-高频加载下沥青路面应变行为分析
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摘要
为考察半刚性基层沥青路面在超重高频动载及环境温度交互作用下的力学响应状况,采用MLS66在高温及常温条件下进行半轴超载50%的足尺加速加载试验。结合加载次数、温度、模量等参数,分析了可控荷载条件下路面结构层底部三向瞬时及累积应变响应的空间分布及时程变化,并对实测值与计算值进行了对比分析。结果表明:面层底部瞬时应变实测值大于计算值,基层中两者较吻合;纵向瞬时应变比为1/5~1/2,且温度越高,应变比越小;高温下瞬时应变幅值为常温下的2~6倍;面层纵向应变温度系数约为横向的2倍,基层(底基层)的三向应变温度系数大致相同;瞬时应变幅值和应变温度系数与路面深度分别呈幂指数、负线性关系;加载次数与累积应变、地震波模量呈双对数线性关系,可用于沥青面层疲劳预估。
In order to investigate the mechanical response of semi-rigid base asphalt pavement under overweight and mobile high-frequency load along with temperature impact,a full-scale accelerated pavement testing(APT)with mobile load simulator 66(MLS66)was conducted.The test simulated a half-axle load,50% higher than the standard,at high and normal air temperature.Considering the parameters of loading applications,temperature,modulus and so on,analysis of the spatial distribution and time-history change of three-dimensional instantaneous and cumulative strains at the bottom of each layer was made.Moreover,calculated and measured strains were compared.The results show that the instantaneous strains measured at each surface layer bottom are greater than the calculated values,while generally good agreement is found between the calculated and measured strains of base or subbase.The longitudinal instantaneous strain ratios are 1/5-1/2,and the higher the temperature,the smaller the strain ratio.The instantaneous strain amplitudes under high temperature are 2-6times of those under ambient temperature.The longitudinal strain-temperature coefficient is twice of transverse one at bottomof asphalt layer,while the temperature coefficients of three-dimensional strains in base or subbase are equal roughly.The amplitude of instantaneous strain and strain-temperature coefficient decrease with the depth following power and linear function respectively.There is a double logarithmic relationship among the loading applications,cumulative strain and seismic modulus,which can be used to estimate the pavement fatigue.
In order to investigate the mechanical response of semi-rigid base asphalt pavement under overweight and mobile high-frequency load along with temperature impact,a full-scale accelerated pavement testing(APT)with mobile load simulator 66(MLS66)was conducted.The test simulated a half-axle load,50% higher than the standard,at high and normal air temperature.Considering the parameters of loading applications,temperature,modulus and so on,analysis of the spatial distribution and time-history change of three-dimensional instantaneous and cumulative strains at the bottom of each layer was made.Moreover,calculated and measured strains were compared.The results show that the instantaneous strains measured at each surface layer bottom are greater than the calculated values,while generally good agreement is found between the calculated and measured strains of base or subbase.The longitudinal instantaneous strain ratios are 1/5-1/2,and the higher the temperature,the smaller the strain ratio.The instantaneous strain amplitudes under high temperature are 2-6times of those under ambient temperature.The longitudinal strain-temperature coefficient is twice of transverse one at bottomof asphalt layer,while the temperature coefficients of three-dimensional strains in base or subbase are equal roughly.The amplitude of instantaneous strain and strain-temperature coefficient decrease with the depth following power and linear function respectively.There is a double logarithmic relationship among the loading applications,cumulative strain and seismic modulus,which can be used to estimate the pavement fatigue.
引文
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[16]董泽蛟,柳浩,谭忆秋,等.沥青路面三向应变响应现场实测研究[J].华南理工大学学报:自然科学版,2009,37(7):46-51.DONG Ze-jiao,LIU Hao,TAN Yi-qiu,et al.Field Measurement of Three-direction Strain Response of Asphalt Pavement[J].Journal of South China University of Technology:Natural Science Edition,2009,37(7):46-51.
[17]马国存.竖向移动荷载作用下沥青路面结构体系响应研究[D].长沙:中南大学,2009.MA Guo-cun.Response Research of Pavement Under Vertical Dynamic Load[D].Changsha:Central South University,2009.
[18]管志光,庄传仪,林明星.足尺沥青混凝土路面加速加载动力响应[J].交通运输工程学报,2012,12(2):24-31.GUAN Zhi-guang,ZHUANG Chuan-yi,LIN Mingxing.Accelerated Loading Dynamic Response of Fullscale Asphalt Concrete Pavement[J].Journal of Traffic and Transportation Engineering,2012,12(2):24-31.
[19]田泽峰,范兴华,刘云全.足尺沥青路面加速加载试验实践导论[M].沈阳:东北大学出版社,2012.TIAN Ze-feng,FAN Xing-hua,LIU Yun-quan.Introduction of Full Scale Accelerated Pavement Test on Asphalt Pavement Practice[M].Shenyang:Northeastern University Press,2012.
[20]NAZARIAN S,BAKER M R,CRAIN K.Development and Testing of a Seismic Pavement Analyzer[R].Washington DC:National Research Council,1993.
[2]AL-QADI I L,LOULIZI A,ELSEIFI M,et al.The Virginia Smart Road:The Impact of Pavement Instrument on Understanding Pavement Performance[C]//AAPT.Proceedings of Technical Sessions of the Journal of the Association of Asphalt Paving Technologists.Lino Lakes:AAPT,2004:427-465.
[3]STOFFELS S M,SOLAIMANIAN M,MORIAN D,et al.Field Instrumentation and Testing Data from Pennsylvania's Superpave In-situ Stress/Strain Investigation[C]//AL-QADI I L.Proceedings of the 2006Airfield and Highway Pavement Specialty Conference.Reston:ASCE,2006:107-118.
[4]DESSOUKY S H,AL-QADI I L,YOO P J.Fulldepth Flexible Pavement Response to Different Truck Tire Loadings[C]//TRB.Proceedings of the Transportation Research Board 86th Annual Meeting.Washington DC:TRB,2007:1-10.
[5]BHATTACHARFEE S,MALLICK R B.Effect of Temperature on Fatigue Performance of Hot Mix Asphalt Tested Under Model Mobile Load Simulator[J].International Journal of Pavement Engineering,2012,13(2):166-180.
[6]MAGGIORE C,AIREY G,MARSAC P.A Dissipated Energy Comparison to Evaluate Fatigue Resistance Using 2-point Bending[J].Journal of Traffic and Transportation Engineering:English Edition,2014,1(1):49-54.
[7]ULLIDTZ P,HARVEY J,TSAI B W,et al.Calibration of Mechanistic-empirical Models for Flexible Pavements Using California Heavy Vehicle Simulators[J].Transportation Research Record,2008,2087:20-28.
[8]GREENE J,CHOUBANE B,UPSHAW P.Evaluation of a Heavy Polymer Modified Asphalt Binder Using Accelerated Pavement Testing[C]//JONES D,HARVEY J,AL-QADI I L.Advances in Pavement Design Through Full-scale Accelerated Pavement Testing.London:CRC Press,2012:209-214.
[9]SAEVARSDOTTIR T,ERLINGSSON S.Evaluation of a Flexible Pavement Structure in an Accelerated Pavement Test[C]//JONES D,HARVEY J,ALQADI I L.Advances in Pavement Design Through Full-scale Accelerated Pavement Testing.London:CRC Press,2012:237-247.
[10]ARRAIGADA M,PARTL M N,PUGLIESSI A.Initial Tests Results from the MLS10Mobile Load Simulator in Switzerland[C]//JONES D,HARVEY J,AL-QADI I L.Advances in Pavement Design Through Full-scale Accelerated Pavement Testing.London:CRC Press,2012:277-285.
[11]TIMM D H,PRIEST A L.Flexible Pavement Fatigue Cracking and Measured Strain Response at the NCAT Test Track[C]//TRB.Proceedings of the Transportation Research Board 86th Annual Meeting.Washington DC:TRB,2008:20-30.
[12]查旭东,张起森.沥青路面结构室内直槽试验验证的研究[J].土木工程学报,2000,33(5):92-96.ZHA Xu-dong,ZHANG Qi-sen.Laboratory Study on the Asphalt Pavement Structure[J].China Civil Engineering Journal,2000,33(5):92-96.
[13]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 Shutao,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.
[14]孟书涛,徐全亮,刘浩,等.沥青路面设计指标和参数研究报告:加速加载试验验证[R].北京:交通运输部公路科学研究院,2008.MENG Shu-tao,XU Quan-liang,LIU Hao,et al.Research on Design Indexes and Parameters of Asphalt Pavement:Experimental Verification by Accelerated Loading Test[R].Beijing:Research Institute of Highway,Ministry of Transport,2008.
[15]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.DONG Zhong-hong,XU Quan-liang,LU Peng-min.Dynamic Response of Semi-rigid Asphalt Pavement Based on Accelerated Pavement Testing[J].China Journal of Highway and Transport,2011,24(2):1-5.
[16]董泽蛟,柳浩,谭忆秋,等.沥青路面三向应变响应现场实测研究[J].华南理工大学学报:自然科学版,2009,37(7):46-51.DONG Ze-jiao,LIU Hao,TAN Yi-qiu,et al.Field Measurement of Three-direction Strain Response of Asphalt Pavement[J].Journal of South China University of Technology:Natural Science Edition,2009,37(7):46-51.
[17]马国存.竖向移动荷载作用下沥青路面结构体系响应研究[D].长沙:中南大学,2009.MA Guo-cun.Response Research of Pavement Under Vertical Dynamic Load[D].Changsha:Central South University,2009.
[18]管志光,庄传仪,林明星.足尺沥青混凝土路面加速加载动力响应[J].交通运输工程学报,2012,12(2):24-31.GUAN Zhi-guang,ZHUANG Chuan-yi,LIN Mingxing.Accelerated Loading Dynamic Response of Fullscale Asphalt Concrete Pavement[J].Journal of Traffic and Transportation Engineering,2012,12(2):24-31.
[19]田泽峰,范兴华,刘云全.足尺沥青路面加速加载试验实践导论[M].沈阳:东北大学出版社,2012.TIAN Ze-feng,FAN Xing-hua,LIU Yun-quan.Introduction of Full Scale Accelerated Pavement Test on Asphalt Pavement Practice[M].Shenyang:Northeastern University Press,2012.
[20]NAZARIAN S,BAKER M R,CRAIN K.Development and Testing of a Seismic Pavement Analyzer[R].Washington DC:National Research Council,1993.
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