基于离散元法的空隙特征对沥青混合料虚拟剪切疲劳寿命的影响

doi:10.13229/j.cnki.jdxbgxb20200154

摘要/Abstract

摘要：

基于图像技术和三维离散元法，建立了具有真实空隙大小和分布以及随机空隙大小和分布的沥青混合料剪切疲劳微观力学模型，通过模拟不同集料粒径、用油量以及温度下的沥青混合料剪切疲劳寿命，研究了空隙分布特征对沥青混合料虚拟剪切疲劳寿命的影响，并将部分模拟结果与试验结果进行对比。结果表明：基于三维离散元法可以模拟沥青混合料剪切疲劳寿命，空隙特征对沥青混合料虚拟剪切疲劳寿命有较大影响。在相同模型参数条件下，具有真实空隙大小和分布的沥青混合料剪切疲劳寿命小于具有随机空隙大小和分布的沥青混合料剪切疲劳寿命，但与试验结果更为接近。此外，集料粒径和用油量也对沥青混合料剪切疲劳寿命有着显著影响。沥青混合料剪切疲劳寿命随集料粒径的增大而提高；在相同集料级配和试验温度时，在最佳用油量条件下的沥青混合料剪切疲劳寿命最大；在相同的集料级配和用油量时，沥青混合料剪切疲劳寿命随温度的升高而降低。

关键词: 道路工程, 沥青混合料, 剪切疲劳寿命, 空隙特征, 离散法

Abstract:

This paper aims to investigate the effect of void characteristics on the virtual shear fatigue life of asphalt mixtures. Using image techniques and three-dimensional （3D） Discrete Element Method （DEM）， the micromechanical models for the shear fatigue life of asphalt mixtures were established considering the real void size and distribution and random void size and distribution. The shear fatigue lives of asphalt mixtures with different aggregate sizes， binder contents， and temperatures were simulated based on these models. Some simulation results were compared with the experimental results. Research results show that the shear fatigue life of asphalt mixtures can be simulated using 3D DEM， and void characteristics significantly affect the virtual shear fatigue life. With the same model parameters， the shear fatigue life considering the real void size and distribution is less than that considering the random void size and distribution， but is closer to the experimental results. Furthermore， aggregate size and binder content also remarkably affect the shear fatigue life of asphalt mixtures. The shear fatigue life increases with the nominal maximum aggregate size （NMAS）. Under the same conditions of NMAS and temperature， the shear fatigue life is the lonest with the optimal binder content. Under the same conditions of NMAS and binder content， the shear fatigue life decreases as the temperature increases.

Key words: road engineering, asphalt mixture, shear fatigue life, void characteristics, discrete element method

中图分类号:

U414

彭勇,杨汉铎,陆学元,李彦伟. 基于离散元法的空隙特征对沥青混合料虚拟剪切疲劳寿命的影响[J]. 吉林大学学报(工学版), 2021, 51(3): 956-964.

Yong PENG,Han-duo YANG,Xue-yuan LU,Yan-wei LI. Effect of void characteristics on virtual shear fatigue life of asphalt mixtures using discrete element method[J]. Journal of Jilin University(Engineering and Technology Edition), 2021, 51(3): 956-964.

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参考文献 30

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级配类型	通过方筛孔(mm)的质量分数/%
级配类型	26.5	19.0	16.0	13.2	9.5	4.75	2.36	1.18	0.6	0.3	0.15	0.075
AC13	100	100	100	94.0	84.7	58.6	25.6	22.4	17.5	12.6	9.2	7.0
AC16	100	100	93.9	84.2	64.9	40.9	25.8	18.5	15.5	10.1	7.8	6.2
AC20	100	95.3	82.9	70.3	60.6	39.0	18.2	15.9	12.3	8.9	6.5	4.9

混合料类型	沥青含量/%	温度/℃	麦克斯韦尔模型		开尔文模型
混合料类型	沥青含量/%	温度/℃	E₁/MPa	η₁/(MPa·s)	E₂/MPa	η₂/(MPa·s)
AC13	4.4	60	0.60	83.13	0.05	0.81
	4.7	60	0.87	109.40	0.10	1.54
	4.9	60	0.39	70.30	0.04	0.60
	4.7	40	2.89	294.65	0.36	9.74
AC16	4.4	60	0.43	112.08	0.05	1.18
AC20	4.2	60	0.54	115.88	0.12	1.72

混合料类型	沥青含量/%	温度/℃	模型中空隙	剪切疲劳寿命/次		平均值 /次
混合料类型	沥青含量/%	温度/℃	模型中空隙	1#	2#	平均值 /次
AC13	4.4	60	真实	6 471	5 944	6 208
	4.4	60	随机	7 615	6 623	7 119
	4.7	60	真实	7 943	7 338	7 641
	4.7	60	随机	8 177	7 741	7 959
	4.9	60	真实	5 531	4 477	5 004
	4.9	60	随机	6 112	4 533	5 323
	4.7	40	真实	157 731	138 642	148 187
	4.7	40	随机	162 684	143 679	153 182
AC16	4.4	60	真实	12 757	12 971	12 864
AC16	4.4	60	随机	13 024	13 417	13 221
AC20	4.2	60	真实	15 478	16 544	16 011
AC20	4.2	60	随机	18 173	20 254	19 224

混合料类型	沥青含量%	温度/℃	剪切疲劳寿命/次					平均值/次
混合料类型	沥青含量%	温度/℃	1#	2#	3#	4#	5#	平均值/次
AC13	4.4	60	5 994	5 757	5 233	5 065	4 796	5 369
	4.7	60	8 018	6 556	9 226	8 278	8 236	8 063
	4.9	60	4 798	4 424	3 758	4 078	4 131	4 238
	4.7	40	140 022	146 148	150 876	157 284	151 920	149 250
AC16	4.4	60	12 998	13 122	11 218	12 199	15 038	12 915
AC20	4.2	60	15 562	16 614	14 154	15 957	15 996	15 657

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