级配碎石动三轴试验离散元模拟

发布时间：2018-04-27 06:32

本文选题：道路工程 + 级配碎石　；参考：《公路交通科技》2014年12期

【摘要】：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1.18 mm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。
[Abstract]:In order to study the mechanical properties of graded macadam, the dynamic triaxial test of graded crushed stone was simulated by discrete element method. According to the composition characteristics of graded crushed stone, a method of producing discrete element test pieces of graded crushed stone is proposed, in which the aggregate particle with diameter less than 1.18 mm is reduced to an equivalent bond force to replace it. Using a numerical servo mechanism, the constant virtual confining pressure is applied by constantly adjusting the radial velocity of the wall, and the user subprogram is written by the FISH language in the discrete element software PFC2D. The simulation of sinusoidal wave load and loading and unloading are realized. The elastic modulus of 8 groups of graded macadam was measured by laboratory test, and the dynamic triaxial test of 8 groups of graded crushed stones was simulated by discrete element method. The simulation results of the elastic modulus of the eight groups of graded macadam were compared with the experimental results. The results show that the elastic modulus obtained by discrete element simulation is in good agreement with the measured results.
【作者单位】：南京工业大学交通学院;东南大学交通学院;
【基金】：国家自然科学基金项目(51178112)
【分类号】：U414;U416.214

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