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级配碎石动三轴试验离散元模拟

Keywords: 道路工程,级配碎石,离散元方法,动三轴试验,回弹模量

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Abstract:

为了研究级配碎石的力学性能,使用离散元方法模拟了级配碎石的动三轴试验.针对级配碎石材料的组成特点,提出了生成级配碎石离散元试件的方法,将粒径小于1.18mm的碎石颗粒简化为黏结力来等效替代.使用一种数值伺服机制通过不断调整墙体径向速度的方法实现了恒定虚拟围压的施加,并通过离散元软件PFC2D中的FISH语言编写用户子程序,实现了正弦波荷载的模拟以及加载和卸载的模拟.通过室内试验测量了8组级配碎石的回弹模量,并使用离散元方法模拟了这8组级配碎石的动三轴试验.对比了这8组级配碎石回弹模量的离散元模拟结果和实验室实测结果.比较结果表明,利用离散元模拟得到的回弹模量和实测结果非常吻合.

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