岩土工程学报2011，Vol.33Issue(9)：1462-1468,7.
离散元模拟中颗粒材料剪切波速的剪切振动确定方法
Determination of shear wave velocity in granular materials by shear vibration within discrete element simulation
摘要
Abstract
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 receiver.The cross-correlation analysis is adopted due to its superiority of both determining the travel time and identifying similarities between two signals.The shear wave velocity is calculated using the wave travel time and the distance of the travel path,in exactly the same way as in laboratory tests.The influencing factors including excitation frequency,excitation amplitude,size of transmitter and receiver as well as damp are carefully analyzed,and reasonable values of the parameters for shear wave modeling are proposed.It is found that the appropriate excitation amplitude should be chosen on the basis of avoiding the generation of frictional work.It is also indicated that fruitful results will be obtained if both the radius of transmitter and receiver are chosen as one half of that of DEM specimen＇s.The research results are verified through the outcomes of even-particle assemblies.关键词
颗粒材料/剪切波速/离散单元法/剪切振动/互相关函数法Key words
granular material/shear wave velocity/discrete element method/shear vibration/cross-correlation analysis分类
建筑与水利引用本文复制引用
徐小敏,凌道盛,黄博,陈云敏..离散元模拟中颗粒材料剪切波速的剪切振动确定方法[J].岩土工程学报,2011,33(9):1462-1468,7.基金项目
国家自然科学基金项目 （）
国家“973”重点基础研究课题 （）
地震行业专项基金项目 （）
