排水沥青混合料单轴静态蠕变试验的离散元仿真
|
摘要
为揭示排水沥青混合料单轴静态蠕变试验的细观力学机制,综合室内试验和数值模拟相结合的方法,采用图像识别技术获取车辙板粗集料及孔隙细观信息,并基于离散元建立单轴静态蠕变试验模型,围绕沥青模量、粘结强度和混合料孔隙率等3个因素对排水沥青混合料高温性能的影响开展了研究。结果表明:在相同的外荷载作用时间下,模量对永久变形的降幅影响略大于蠕变柔量,模量由1倍提升至5倍,蠕变柔量约降低3.7倍,永久变形降低约4.7倍;模量增大至4倍后,永久变形量和蠕变柔量的降幅趋于平缓;空隙率由18%提升至22%,蠕变柔量和永久变形量均增大约40%,混合料耐久性明显降低,空隙率18%-19%阶段对永久变形和蠕变柔量的增幅较为平缓,19%-22%阶段永久变形和蠕变柔量的增幅增大,且接近线性关系;混合料承载力随粘结强度提高而增大,不同粘结强度(280、300、500 N)对永久变形量和蠕变柔量的影响基本一致,且低粘结强度(250～300 N)对永久变形量和蠕变柔量的影响远大于高粘结强度(300～700 N)。在影响蠕变柔量与永久变形计算值可靠度的3个因素中,按可靠度高低排序依次为:粘结强度、空隙率、模量。
In order to reveal the meso-mechanics mechanism of uniaxial static creep test of porous asphalt mixture,image recognition technology was used to obtain the coarse aggregate and the pore mesoscopic information of rutting slab,through combining laboratory test and numerical simulation. Based on the discrete element,a uniaxial static creep test model was set up and the influence of three factors such as asphalt modulus,bond strength and mixture porosity on the high temperature performance of asphalt mixture was studied. The results show that,under the same external load and acting time,the modulus has a slightly greater effect on the decrease of permanent deformation than creep compliance. The modulus increases from 1 to 5 times,the creep compliance decreases by 3. 7 times and the permanent deformation decreases by about 4. 7 times. When modulus increases to 4 times,the decrease amplitude of permanent deformation and creep compliance tends to be gentle. The porosity increases from 18% to 22%,and creep compliance and permanent deformation increase by about40%. The durability of the mixture is obviously reduced. The increase of permanent deformation and creep compliance is gentle in the stage of porosity ranging from 18% to 19%; the amplification of permanent deformation and creep compliance increases and approaches linear relationship in the stage of porosity ranging from 19% to 22%. The bearing capacity of the mixture increases with the increase of bond strength. The effect of different bond strengths( 280,300,500 N) on the permanent deformation and creep compliance is basically the same,and the effect of low bond strength( 250-300 N) on the permanent deformation and creep compliance is much greater than that of high bond strength( 300-700 N). Among the three factors affecting the reliability of creep compliance and permanent deformation,bond strength,porosity and modulus are in turn.
In order to reveal the meso-mechanics mechanism of uniaxial static creep test of porous asphalt mixture,image recognition technology was used to obtain the coarse aggregate and the pore mesoscopic information of rutting slab,through combining laboratory test and numerical simulation. Based on the discrete element,a uniaxial static creep test model was set up and the influence of three factors such as asphalt modulus,bond strength and mixture porosity on the high temperature performance of asphalt mixture was studied. The results show that,under the same external load and acting time,the modulus has a slightly greater effect on the decrease of permanent deformation than creep compliance. The modulus increases from 1 to 5 times,the creep compliance decreases by 3. 7 times and the permanent deformation decreases by about 4. 7 times. When modulus increases to 4 times,the decrease amplitude of permanent deformation and creep compliance tends to be gentle. The porosity increases from 18% to 22%,and creep compliance and permanent deformation increase by about40%. The durability of the mixture is obviously reduced. The increase of permanent deformation and creep compliance is gentle in the stage of porosity ranging from 18% to 19%; the amplification of permanent deformation and creep compliance increases and approaches linear relationship in the stage of porosity ranging from 19% to 22%. The bearing capacity of the mixture increases with the increase of bond strength. The effect of different bond strengths( 280,300,500 N) on the permanent deformation and creep compliance is basically the same,and the effect of low bond strength( 250-300 N) on the permanent deformation and creep compliance is much greater than that of high bond strength( 300-700 N). Among the three factors affecting the reliability of creep compliance and permanent deformation,bond strength,porosity and modulus are in turn.
引文
[1]曹庭维.掺高粘度沥青添加剂排水性沥青混合料的性能研究[D].武汉:武汉理工大学,2008.CAO Weiting. Research on the Properties of Porous Asphalt Mixture Containing High Viscosity Additive[D]. Wuhan:Wuhan University of Technology,2008.
[2]冯新军,郝培文,查旭东.开级配沥青稳定碎石基层混合料设计方法研究[J].武汉理工大学学报,2009,31(17):57-61.FENG Xinjun,HAO Peiwen,ZHA Xudong. Study on determination method of the optimal oil-stone rate of open-graded asphalt treated base[J]. Journal of Wuhan University of Technology,2009,31(17):57-61.
[3]李立寒,王浩仰,耿韩.排水性沥青混合料抗车辙能力及其敏感性分析[J].建筑材料学报,2013,16(4):603-607.LI Lihan, WANG Haoyang, GENG Han. Analysis on rutting resistance of drainage asphalt mixture and its sensitivity[J]. Journal of Building Materials,2013,16(4):603-607.
[4]黎晓,程志豪,郑少鹏.排水沥青混合料永久变形性能试验研究[J].公路工程,2017,42(1):185-189.LI Xiao, CHEN Zhihao, ZHENG Shaopeng. Research on the permanent deformation for porous asphalt mixes[J]. Highway Engineering,2017,42(1):185-189.
[5]肖鑫,张肖宁.排水沥青路面排水能力分析及目标空隙率确定[J].中外公路,2016,36(1):49-53.XIAO Xin, ZHANG Xiaoning. Analysis of drainage capacity of drainage asphalt pavement and determination of target voidage[J]. Journal of China&Foreign Highway,2016,36(1):49-53.
[6]李晓军,冯樊.沥青混凝土单轴蠕变虚拟仿真[J].武汉理工大学学报,2010,32(14):97-101.LI Xiaojun,FENG Fan. Virtual test of uniaxial compression creep test of asphalt concrete with micromechanical finite element method[J].Journal of Wuhan University of Technology,2010,32(14):97-101.
[7]张良.基于离散单元法的沥青混凝土路面车辙研究[D].重庆:重庆交通大学,2013.ZHANG Liang. Asphalt Concrete Pavement Rutting Research Based on Discrete Element Method[D]. Chongqing:Chongqing Jiaotong University,2013.
[8] YOU Zhanping, LIU Yu, DAI Qingli. Three-dimensional microstructural-based discrete element viscoelastic modeling of creep compliance tests for asphalt mixtures[J]. Journal of Materials in Civil Engineering,2011,23(1):79-87.
[9]LIU Yu,DAI Qingli,YOU Zhanping. Viscoelastic model for discrete element simulation of asphalt mixtures[J]. Journal of Engineering Mechanics,2009,135(4):324-333.
[10] LIU Yu,YOU Zhanping. Discrete-element modeling:impacts of aggregate sphericity,orientation,and angularity on creep stiffness of idealized asphalt mixtures[J]. Journal of Engineering Mechanics,2011,137(4):294-303.
[11]ZELELEWH M. Simulation of the Permanent Deformation of Asphalt Concrete Mixtures Using Discrete Element Method[D]. Washington:Washington State University,2008.
[12]周志刚,李利略,袁秀湘.再生沥青混合料单轴静态蠕变试验的离散元仿真[J].交通科学与工程,2013,29(3):1-7.ZHOU Zhigang, LI Lilve, YUAN Xiuxiang. Discrete element simulation on uniaxial static creep test of recycled asphalt mixtures[J]. Journal of Transport Science and Engineering,2013,29(3):1-7.
[13]张育德.基于离散元方法的沥青混合料虚拟永久变形试验研究[D].南京:东南大学,2013.ZHANG Yude. Virtual Permanent Deformation Tests of Asphalt Mixture Using Discrete Element Method[D]. Nanjing:Southeast University,2013.
[14]陈俊.基于离散元方法的沥青混合料虚拟疲劳试验研究[D].南京:东南大学,2010.CHEN Jun. Virtual Fatigue Test of Asphalt Mixture Based on Discrete Element Method[D]. Nanjing:Southeast University,2010.
[15]DOZ·YCKI B,JUDYCKI J. Behavior of asphalt concrete in cyclic and static compression creep test with and without lateral confinement[J]. Road Materials and Pavement Design,2008,9(2):207-225.
[16]李辉,张久鹏,黄晓明.沥青混合料高温稳定性的单轴静载蠕变试验[J].河南科技大学学报:自然科学版,2006,27(3):48-51.LI Hui,ZHANG Jiupeng,HUANG Xiaoming. Uniaxial static creep test of the high temperature stability of asphalt mixture[J].Journal of Henan University of Science and Technology:Natural Science,2006,27(3):48-51.
[2]冯新军,郝培文,查旭东.开级配沥青稳定碎石基层混合料设计方法研究[J].武汉理工大学学报,2009,31(17):57-61.FENG Xinjun,HAO Peiwen,ZHA Xudong. Study on determination method of the optimal oil-stone rate of open-graded asphalt treated base[J]. Journal of Wuhan University of Technology,2009,31(17):57-61.
[3]李立寒,王浩仰,耿韩.排水性沥青混合料抗车辙能力及其敏感性分析[J].建筑材料学报,2013,16(4):603-607.LI Lihan, WANG Haoyang, GENG Han. Analysis on rutting resistance of drainage asphalt mixture and its sensitivity[J]. Journal of Building Materials,2013,16(4):603-607.
[4]黎晓,程志豪,郑少鹏.排水沥青混合料永久变形性能试验研究[J].公路工程,2017,42(1):185-189.LI Xiao, CHEN Zhihao, ZHENG Shaopeng. Research on the permanent deformation for porous asphalt mixes[J]. Highway Engineering,2017,42(1):185-189.
[5]肖鑫,张肖宁.排水沥青路面排水能力分析及目标空隙率确定[J].中外公路,2016,36(1):49-53.XIAO Xin, ZHANG Xiaoning. Analysis of drainage capacity of drainage asphalt pavement and determination of target voidage[J]. Journal of China&Foreign Highway,2016,36(1):49-53.
[6]李晓军,冯樊.沥青混凝土单轴蠕变虚拟仿真[J].武汉理工大学学报,2010,32(14):97-101.LI Xiaojun,FENG Fan. Virtual test of uniaxial compression creep test of asphalt concrete with micromechanical finite element method[J].Journal of Wuhan University of Technology,2010,32(14):97-101.
[7]张良.基于离散单元法的沥青混凝土路面车辙研究[D].重庆:重庆交通大学,2013.ZHANG Liang. Asphalt Concrete Pavement Rutting Research Based on Discrete Element Method[D]. Chongqing:Chongqing Jiaotong University,2013.
[8] YOU Zhanping, LIU Yu, DAI Qingli. Three-dimensional microstructural-based discrete element viscoelastic modeling of creep compliance tests for asphalt mixtures[J]. Journal of Materials in Civil Engineering,2011,23(1):79-87.
[9]LIU Yu,DAI Qingli,YOU Zhanping. Viscoelastic model for discrete element simulation of asphalt mixtures[J]. Journal of Engineering Mechanics,2009,135(4):324-333.
[10] LIU Yu,YOU Zhanping. Discrete-element modeling:impacts of aggregate sphericity,orientation,and angularity on creep stiffness of idealized asphalt mixtures[J]. Journal of Engineering Mechanics,2011,137(4):294-303.
[11]ZELELEWH M. Simulation of the Permanent Deformation of Asphalt Concrete Mixtures Using Discrete Element Method[D]. Washington:Washington State University,2008.
[12]周志刚,李利略,袁秀湘.再生沥青混合料单轴静态蠕变试验的离散元仿真[J].交通科学与工程,2013,29(3):1-7.ZHOU Zhigang, LI Lilve, YUAN Xiuxiang. Discrete element simulation on uniaxial static creep test of recycled asphalt mixtures[J]. Journal of Transport Science and Engineering,2013,29(3):1-7.
[13]张育德.基于离散元方法的沥青混合料虚拟永久变形试验研究[D].南京:东南大学,2013.ZHANG Yude. Virtual Permanent Deformation Tests of Asphalt Mixture Using Discrete Element Method[D]. Nanjing:Southeast University,2013.
[14]陈俊.基于离散元方法的沥青混合料虚拟疲劳试验研究[D].南京:东南大学,2010.CHEN Jun. Virtual Fatigue Test of Asphalt Mixture Based on Discrete Element Method[D]. Nanjing:Southeast University,2010.
[15]DOZ·YCKI B,JUDYCKI J. Behavior of asphalt concrete in cyclic and static compression creep test with and without lateral confinement[J]. Road Materials and Pavement Design,2008,9(2):207-225.
[16]李辉,张久鹏,黄晓明.沥青混合料高温稳定性的单轴静载蠕变试验[J].河南科技大学学报:自然科学版,2006,27(3):48-51.LI Hui,ZHANG Jiupeng,HUANG Xiaoming. Uniaxial static creep test of the high temperature stability of asphalt mixture[J].Journal of Henan University of Science and Technology:Natural Science,2006,27(3):48-51.