单向拉伸应力状态下沥青混合料强度和刚度特性
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摘要
为了解单向拉伸应力状态下沥青混合料的强度、刚度特性及破坏原因,进行不同加载速度的直接拉伸动回弹模量、静回弹模量及强度试验,揭示沥青混合料强度、回弹模量、破坏应变、应变能等参数随加载速度的变化规律。建立初始开裂对应的各个力学参数与加载速度之间的幂函数关系,并从破坏机理上将材料设计与结构层的设计相统一。研究结果表明:在单轴拉伸试验中,沥青混合料的动、静回弹模量随加载速度的增大而呈幂函数增大,且动回弹模量随着温度的升高而降低;进行不同加载速度的破坏试验时,试件的初始开裂应变基本保持稳定,且表现为拉应变破坏特征,故拉应变是导致沥青混合料发生破坏的原因,用第二强度理论作为直接拉伸条件下的破坏准则较合适。
In order to study stress and stiffness properties, as well as failure reason of asphalt mixture under uniaxial tensile stress state, static resilient modulus tests, dynamic resilient modulus tests and strength tests with various loading rates were carried out. Based on the tests, the change law of mechanics parameters such as strength, modulus, failure strain and strain energy of asphalt mixture with loading rates were revealed. The power function relations among various mechanics parameters corresponding to initial crack and loading rates were established. Material design and structural layer design were unified in failure mechanism. The results show that the dynamic and static resilient modulus increase with the increase of loading rate as power function. Besides, the dynamic modulus decreases with the increase of temperature. The initial cracking strain of specimen almost keeps stable at various loading rates, and presents tensile strain failure. So, tensile strain is the main factor leading to failure, and the second strength theory can be used as failure criterion for direct tensile condition.
In order to study stress and stiffness properties, as well as failure reason of asphalt mixture under uniaxial tensile stress state, static resilient modulus tests, dynamic resilient modulus tests and strength tests with various loading rates were carried out. Based on the tests, the change law of mechanics parameters such as strength, modulus, failure strain and strain energy of asphalt mixture with loading rates were revealed. The power function relations among various mechanics parameters corresponding to initial crack and loading rates were established. Material design and structural layer design were unified in failure mechanism. The results show that the dynamic and static resilient modulus increase with the increase of loading rate as power function. Besides, the dynamic modulus decreases with the increase of temperature. The initial cracking strain of specimen almost keeps stable at various loading rates, and presents tensile strain failure. So, tensile strain is the main factor leading to failure, and the second strength theory can be used as failure criterion for direct tensile condition.
引文
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[13]李亦鹏.不同应力状态下沥青混合料强度与刚度特性研究[D].长沙:长沙理工大学交通运输工程学院,2017:10-15.LI Yipeng.Research on strength and stiffness features of asphalt mixture under different stress states[D].Changsha:Changsha University of Science and Technology.School of Traffic and Transportation Engineering,2017:10-15.
[14]吕松涛.考虑加载速度影响的沥青混合料疲劳方程[J].工程力学,2012,29(8):276-281.LüSongtao.Fatigue equation of asphalt mixture considering the influence of loading rate[J].Engineering Mechanics,2012,29(8):276-281.
[15]HUANG Tuo,QI Shuai,YANG Ming,et al.Strength criterion of asphalt mixtures in three-dimensional stress states under freeze-thaw conditions[J].Applied Sciences,2018,8(8):1302-1316.
[16]HUANG Tuo,ZHENG Jianlong,LüSongtao,et al.Failure criterion of an asphalt mixture under three-dimensional stress state[J].Construction and Building Materials,2018,170,708-715.
[17]黄拓,郑健龙.不同试验方法的沥青混合料强度特性[J].中南大学学报(自然科学版),2016,47(8):2820-2827.HUANG Tuo,ZHENG Jianlong.Strength characteristics of asphalt mixture with various loading modes[J].Journal of Central South University(Science and Technology),2016,47(8):2820-2827.
[2]罗增杰.三向独立加载条件下沥青混合料强度特性[D].长沙:长沙理工大学交通运输工程学院,2012:21-30.LUO Zengjie.Strength characteristics of asphalt mixture under three-direction independent load[D].Changsha:Changsha University of Science and Technology.School of Traffic and Transportation Engineering,2012:21-30.
[3]黄拓.沥青混合料三轴试验方法及破坏准则研究[D].长沙:长沙理工大学交通运输工程学院,2013:2-11.HUANG Tuo.Study on triaxial test method and failure criterion of asphalt mixture[D].Changsha:Changsha University of Science and Technology.School of Traffic and Transportation Engineering,2013:2-11.
[4]ZHENG Jianlong,HUANG Tuo.Study on triaxial test method and failure criterion of asphalt mixture[J].Journal of Traffic and Transportation Engineering(English Edition),2015,2(2):93-106.
[5]WANG L B,HOYOS L R,WANG J,et al.Anisotropic properties of asphalt concrete:characterization and implications for pavement design and analysis[J].Journal of Materials in Civil Engineering,2015,17(5):535-543.
[6]延西利,吕嵩巍,陶家朴.沥青混合料内在参数的实验研究[J].西安公路交通大学学报,1997,17(3):9-13.YAN Xili,LüSongwei,TAO Jiapu.Experimental study on the intrinsic parameters of bituminous mixtures[J].Journal of Xi'an Highway University,1997,17(3):9-13.
[7]HUANG Tuo,PAN Qinxue,JIN Jiao,et al.Continuous constitutive model for bimodulus materials with meshless approach[J].Applied Mathematical Modelling,2019(66):41-58.
[8]黄拓,郑健龙,钱国平.沥青混合料实测拉应变的试验研究[J].中外公路,2013,33(1):209-211.HUANG Tuo,ZHENG Jianlong,QIAN Guoping.Experimental study for the measured tensile strain of asphalt mixture[J].Chinese and Foreign Highway,2013,33(1):209-211.
[9]钱国平,刘宏富,郑健龙,等.不同受力模式下沥青混合料强度的速度特性试验研究[J].中南大学学报(自然科学版),2012,43(2):681-687.QIAN Guoping,LIU Hongfu,ZHENG Jianlong,et al.Strength experiment of speed characteristic of asphalt mixtures in different force modes[J].Journal of Central South University(Science and Technology),2012,43(2):681-687.
[10]李帅.不同受力模式下沥青混合料变形与破坏特征研究[D].长沙:长沙理工大学交通运输工程学院,2011:1-2.LI Shuai.Research on deformation characteristics and damage characteristics of asphalt mixture under different stress patterns[D].Changsha:Changsha University of Science&Technology.School of Traffic and Transportation Engineering,2011:1-2.
[11]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].
[12]JTG D50-2017,公路沥青路面设计规范[S].JTG D50-2017,Specifications for design of highway asphalt pavement[S].
[13]李亦鹏.不同应力状态下沥青混合料强度与刚度特性研究[D].长沙:长沙理工大学交通运输工程学院,2017:10-15.LI Yipeng.Research on strength and stiffness features of asphalt mixture under different stress states[D].Changsha:Changsha University of Science and Technology.School of Traffic and Transportation Engineering,2017:10-15.
[14]吕松涛.考虑加载速度影响的沥青混合料疲劳方程[J].工程力学,2012,29(8):276-281.LüSongtao.Fatigue equation of asphalt mixture considering the influence of loading rate[J].Engineering Mechanics,2012,29(8):276-281.
[15]HUANG Tuo,QI Shuai,YANG Ming,et al.Strength criterion of asphalt mixtures in three-dimensional stress states under freeze-thaw conditions[J].Applied Sciences,2018,8(8):1302-1316.
[16]HUANG Tuo,ZHENG Jianlong,LüSongtao,et al.Failure criterion of an asphalt mixture under three-dimensional stress state[J].Construction and Building Materials,2018,170,708-715.
[17]黄拓,郑健龙.不同试验方法的沥青混合料强度特性[J].中南大学学报(自然科学版),2016,47(8):2820-2827.HUANG Tuo,ZHENG Jianlong.Strength characteristics of asphalt mixture with various loading modes[J].Journal of Central South University(Science and Technology),2016,47(8):2820-2827.