基于颗粒流理论的颗粒材料振动流化特性研究  

Study on Vibrational Fluidization Characteristics of Granular Material Based on Particle Flow Theory

作　　者：孙仕 张谢东[1] 张志华[1,2] SUN Shi;ZHANG Xiedong;ZHANG Zhihua(School of Transportation, Wuhan University of Technology, Wuhan 430063, China;Changjiang River Scientific Research Institute of Changjiang Water Resources Commission, Wuhan 430010, China)

机构地区：[1]武汉理工大学交通学院,武汉430063 [2]长江水利委员会长江科学院,武汉430010

出　　处：《武汉理工大学学报（交通科学与工程版）》2020年第2期383-387,共5页Journal of Wuhan University of Technology（Transportation Science & Engineering）

摘　　要：为分析颗粒材料的振动流化特性,基于室内试验结果得到材料的峰值强度、振动前残余强度以及振动后残余强度,采用颗粒流模型模拟材料在剪切振动过程中的流化现象,细观分析试样在振动过程中的流化特性和振动后的力学特性.研究表明,室内试验与数值试验结果吻合度较好;在剪切振动之前,根据测量模型内的局部体应变将上部剪切模型分割成三个区域,并确定了其厚度;在振动过程中,颗粒材料发生流化现象,伴有剪切强度、竖向位移以及局部体应变均减小的特性,表现出显著的应变局部化现象,颗粒体密实度增大,导致振动后抗剪强度增大.In order to analyze the vibration fluidization characteristics of granular materials,the peak strength,residual strength before vibration and residual strength after vibration of the materials were obtained based on laboratory test results.The particle flow model was used to simulate the fluidization of materials during shear vibration.The fluidization characteristics of samples during vibration and the mechanical characteristics after vibration were analyzed in a microscopic way.The research shows that the results of laboratory tests and numerical tests are in good agreement.Before shear vibration,the upper shear model is divided into three regions according to the local volume strain in the measurement model,and its thickness is determined.During the vibration process,the particle material fluidizes,accompanied by the reduction of shear strength,vertical displacement and local body strain,showing a significant strain localization phenomenon.The particle density increases,resulting in an increase in shear strength after vibration.

关 键 词：颗粒流模型 剪切振动流化试验 应变局部化 

分 类 号：TU43[建筑科学—岩土工程]