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沥青混合料裂缝扩展过程细观力学模拟(英文)

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Keywords: 路面材料,沥青混合料,离散元方法,裂缝扩展,细观力学模拟

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Abstract:

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。

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