1. Shaanxi College of Communication Technology, Xi'an Shaanxi 710018, China;
2. School of Highway, Chang'an University, Xi'an Shaanxi 710064, China;
3. School of Materials Science and Engineering, Chang'an University, Xi'an Shaanxi 710064, China
Numerical Analysis on the Splitting Test of Open-graded Large Stone Asphalt Mixture Based on Discrete Element Method
GUO Hong-bing1,2, CHEN Shuan-fa3
1. Shaanxi College of Communication Technology, Xi'an Shaanxi 710018, China;
2. School of Highway, Chang'an University, Xi'an Shaanxi 710064, China;
3. School of Materials Science and Engineering, Chang'an University, Xi'an Shaanxi 710064, China
摘要The deficiencies of analyzing and calculating asphalt mixture as a perfectly elastic body in the existing structural design theory of asphalt pavement were amended by numerically simulating the splitting (indirect tensile) test of AC-16, AC-20, and OLSM-25 (open-graded large stone asphalt mixture) from the microscopic view based on the discrete element method and 2D particle flow code. The aggregate particle contact forces, displacement vectors, numbers of micro-cracks as well as the distribution laws of the cylindrical specimens of AC-16, AC-20, and OLSM-25 were also analyzed and compared by numerically simulating the splitting test. Results indicated that under the influence of peak axial force, the distribution form of the contact force between the aggregate particles in the specimens changed from being basically uniform into being relatively discrete. When the cylindrical specimen of asphalt mixture cracked, the displacement vector greatly varied from one another with the increase of the nominal maximum size and porosity of asphalt mixture as well as with the decrease of asphalt-aggregate ratio of such mixture. Moreover, the number of micro-cracks was determined to gradually reduce. Compared with AC-16 and AC-20, the anti-cracking effect of OLSM-25 in the indirect tensile test was more significant and remarkable.
Abstract：The deficiencies of analyzing and calculating asphalt mixture as a perfectly elastic body in the existing structural design theory of asphalt pavement were amended by numerically simulating the splitting (indirect tensile) test of AC-16, AC-20, and OLSM-25 (open-graded large stone asphalt mixture) from the microscopic view based on the discrete element method and 2D particle flow code. The aggregate particle contact forces, displacement vectors, numbers of micro-cracks as well as the distribution laws of the cylindrical specimens of AC-16, AC-20, and OLSM-25 were also analyzed and compared by numerically simulating the splitting test. Results indicated that under the influence of peak axial force, the distribution form of the contact force between the aggregate particles in the specimens changed from being basically uniform into being relatively discrete. When the cylindrical specimen of asphalt mixture cracked, the displacement vector greatly varied from one another with the increase of the nominal maximum size and porosity of asphalt mixture as well as with the decrease of asphalt-aggregate ratio of such mixture. Moreover, the number of micro-cracks was determined to gradually reduce. Compared with AC-16 and AC-20, the anti-cracking effect of OLSM-25 in the indirect tensile test was more significant and remarkable.
基金资助:Supported by the Road and Transport R&D Project for Western Regions of China Commissioned by Ministry of Transport (No.200831881210);the Fundamental Research Funds for the Central Universities (No.CHD2010JC011);the Special Scientific Research Plan of Education Department of Shaanxi Provincial Government (No.14JK1067)
郭红兵, 陈拴发. 开级配大粒径沥青碎石混合料劈裂试验的离散元数值分析[J]. Journal of Highway and Transportation Research and Development, 2015, 9(2): 7-12.
GUO Hong-bing, CHEN Shuan-fa. Numerical Analysis on the Splitting Test of Open-graded Large Stone Asphalt Mixture Based on Discrete Element Method. Journal of Highway and Transportation Research and Development, 2015, 9(2): 7-12.
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2015, Vol. 9 
