成型方法对沥青混凝土力学性质影响的细观研究

Influence of Compaction Method on Mechanical Property of Asphalt Concrete

基于离散元原理(DEM),利用二维颗粒流程序(PFC2D)模拟了沥青混凝土三轴试验静压法和振动法成型制样方法,从细观层面分析了不同制样方法引起沥青混凝土应力应变行为差异的原因。结果表明,制样方法不同,沥青混凝土的细观结构也不同,主要表现为配位数和粘结数不同,从而影响宏观的应力—应变行为。

Based on the principle of DEM,the PFC2D is applied to simulate compaction methods of static pressure and vibration for asphalt concrete under the conditions of trixial tests.In the view point of micromechanics,the difference reason of stress-strain behavior caused by different compaction methods is analyzed.The results show that the micromechanism of asphalt concrete is different with different compaction methods;it represents the different of coordination number and contact-bond number,which affects the macro behaviors of the stress-strain.