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利用格形模型预测沥青混合料的等效弹性性质

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Keywords: 道路工程,等效弹性性质,格形模型,沥青混合料,统计分析

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Abstract:

通过建立沥青混合料的三维随机格形模型,加载适当载荷和边界条件求解后,采用体积平均法得出混合料等效弹性性质。大量重复随机投放过程可获得沥青混合料等效弹性参量的分布,卡方检验结果表明等效弹性模量服从正态分布,期望值处于Paul上下限之间,并且接近上限值。同时,由于骨料分布的随机性,沥青混合料不同方向等效泊松比的期望值和标准差存在很小的差异,体现出很弱的各向异性性质。随着骨料体积分数的增加,沥青混合料等效弹性模量的期望值增大,而标准差减小。骨料和沥青砂的弹性模量越接近,等效弹性模量的的标准差越小。沥青砂弹性模量的变化对沥青混合料等效弹性模量的影响最大。

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