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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

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【作者】 徐小敏凌道盛黄博陈云敏

【Author】 XU Xiao-min,LING Dao-sheng,HUANG Bo,CHEN Yun-min(Key Laboratory of Soft Soils and Geoenvironmental Engineering of Ministry of Education,Zhejiang University,Hangzhou 310058,China)

【机构】 浙江大学软弱土与环境土工教育部重点实验室

【摘要】 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PFC3D,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。

【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.

【基金】 国家自然科学基金项目(50778163,50708095);国家“973”重点基础研究课题(2007CB714200);地震行业专项基金项目(200808022)
  • 【文献出处】 岩土工程学报 ,Chinese Journal of Geotechnical Engineering , 编辑部邮箱 ,2011年09期
  • 【分类号】TU521
  • 【被引频次】2
  • 【下载频次】330
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