东南大学学报（自然科学版）Issue(5)：1057-1061,5.DOI:10.3969/j.issn.1001-0505.2014.05.032
基于离散元方法的沥青混合料虚拟三轴剪切试验三维模拟
Three dimensional simulation of virtual triaxial shear test for asphalt mixture based on discrete element method
摘要
Abstract
A mesoscopic mechanic structure model of asphalt mixture is established based on the dis-crete element method and validated by using the virtual triaxial shear tests.First,a coarse aggregate generation algorithm is developed based on the working mechanism of the square sieve system,ag-gregates with irregular shapes are generated,making the shape control of coarse aggregate diversified and precise.Then,the air void phase with actual longitudinal distribution scenario is introduced into the mesoscopic structure model of asphalt mixture,which substitutes the random distribution in tradi-tional methods.The contact constitutive parameters of asphalt mastic at medium and high tempera-tures are obtained by combing laboratory tests and virtual tests.The simulation results of virtual tri-axial shear tests and the predictive results for anti-shear strengths of asphalt mixture verify the reason-ableness of the proposed mesoscopic mechanic structure model.The shear damage modes from the laboratory tests and those of the actual specimens are similar,and the shear strengths of laboratory tests generally agree with the actual results.关键词
沥青混合料/细观结构/离散元方法/三轴剪切试验/粗集料相Key words
asphalt mixture/microscopic structure/discrete element method/triaxial shear test/coarse aggregate phase分类
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杨军,焦丽亚,王克利,张建同..基于离散元方法的沥青混合料虚拟三轴剪切试验三维模拟[J].东南大学学报（自然科学版）,2014,(5):1057-1061,5.基金项目
国家自然科学基金资助项目（51078089）． （）
