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采用离散元方法构建了沥青混合料马歇尔数字试件,模拟了间接拉伸试验,研究了粘结强度比、颗粒摩擦因数和加载速率对微裂缝扩展过程的影响,分析了试件内部颗粒的细观响应。模拟结果表明:粘结强度比越大,沥青的粘结特性越明显,使得微裂缝的类型由法向渐变为切向,当粘结强度比由0.500增大到4.000时,接触力减小了78.05%,位移减小了78.57%;摩擦因数的增大,提高了集料的粗糙度,当摩擦因数由0.3增大到0.7时,接触力增大了31.21%,位移减小了21.45%,但其对微裂缝的分布影响不大,主要为法向微裂缝;当加载速率由0.03mm.s-1增大到0.07mm.s-1时,接触力增大了3.50%,微裂缝的类型、数量与位移大小基本不变,相比沥青和集料,加载条件对微裂缝扩展的影响很小。
The discrete element method was used to construct the Marshall digital specimen of asphalt mixture. The indirect tensile test was simulated. The influence of bond strength ratio, particle friction coefficient and loading rate on microcrack expansion process was studied. View response. The simulation results show that the greater the bond strength ratio is, the more obvious the bitumen adhesion is. The type of microcracks changes from normal to tangential direction. When the bond strength increases from 0.500 to 4.000, the contact force decreases 78.05% and 78.57% respectively. When the friction coefficient increases, the aggregate roughness increases. When the friction coefficient increases from 0.3 to 0.7, the contact force increases by 31.21% and the displacement decreases by 21.45% However, it has little effect on the distribution of micro-cracks, which is mainly the normal micro-cracks. When the loading rate increases from 0.03mm.s-1 to 0.07mm.s-1, the contact force increases by 3.50% The types, quantities and displacements are basically the same, and the loading conditions have little effect on the propagation of micro-cracks compared to asphalt and aggregates.