水工沥青混凝土三轴试验的三维细观模拟

基于颗粒离散元理论,利用沥青混凝土三轴试验进行三维数值模拟,对水工沥青混凝土的细观性能研究具有重要意义。通过数值模拟发现:根据沥青混凝土的材料组成及特性,选择合适的材料单元间的接触本构模型以及合理的细观力学参数,使用颗粒流PFC3D软件可近似模拟沥青混凝土的室内三轴试验,并可再现试件剪切破坏的发展过程;数值模拟试验所得到的应力-应变曲线及体积应变-轴向应变曲线与室内三轴试验结果基本一致。

Three Dimensional Mesoscopic Simulation of Hydraulic Asphalt Concrete Triaxial Test

Based on the particle discrete element theory ,three dimensional numerical simulation of the asphalt concrete is of great significance to the meso-performance of hydraulic asphalt concrete research .Through numerical simulation ,the results show that the laboratory triaxial test of asphalt concrete can be simulated by particle flow software (PFC3D ) if we select the appropriate contact constitutive model and mesoscopic parameters between elements according to the material composition and properties of asphalt concrete ,and the development process of shear failure can be reproduced .The stress-strain curves and the volumetric strain-axial strain curves obtained by numerical simulation are basically consistent with the results of laboratory triaxial test .