离散元模拟中颗粒材料剪切波速的剪切振动确定方法

砂土等颗粒材料的剪切波速是反映其工程性质的重要参数，离散元模拟中实现剪切波速实时测试对研究砂土材料力学性质变化的细观机理具有重要意义。本文基于软件 PFC^3D ，在试样模型中设置激发源和接收源，通过对激发源施加产生剪切振动的速度脉冲、在接收源监测扰动信号，实现了剪切波在颗粒材料中的传播模拟和信号监测，提出了利用激发和接收信号的互相关系数确定剪切波传播时间和评价剪切波传播质量的方法。系统分析了激发频率、激发幅值、激发源和接收源尺寸、阻尼等因素对剪切波速测定的影响，给出了合理的参数取值范围。研究结果得到了均匀颗粒试样理论解的验证。

Determination of shear wave velocity in granular materials by shear vibration within discrete element simulation

Shear wave velocity is an important parameter to reflect the engineering properties of granular materials like sand.The measurement of shear wave velocity throughout the discrete element simulation is of great significance to understand the microscopic mechanism of variation of the mechanical properties.Numerical simulation of shear wave propagation using DEM is implemented by applying a velocity pulse to the transmitter in a certain direction and monitoring the corresponding average velocity of the receive...