摘要
对颗粒材料动力特性的研究发现,颗粒材料具有明显色散特性,因而确定不同激励频率下颗粒材料介质中波速的变化对研究颗粒材料动力特性具有重要意义。设计了教学实验,将使用GDS三轴系统结合弯曲元测试系统,测定一定围压下颗粒材料(以玻璃珠为例)剪切波速随激励频率的变化规律。该实验目的明确,通过该实验学生能够掌握GDS三轴试验中颗粒材料的制样、弯曲元系统的操作及确定颗粒材料中波速随频率变化的测定方法。有利于培养学生的动手能力、科研意识及团队协作的能力,为以后的学习和工作打下坚实的基础。
According to previous studies,it is known that granular materials have obvious dispersion characteristics,and it is important to determine the variation of wave velocity in granular media at different excitation frequencies to study the dynamic properties of granular materials.This experiment uses the GDS hollow torsional shear system combined with the bending element test system to determine the variation of shear wave velocity with excitation frequency within the granular material(glass beads as an example)under a certain surrounding pressure.The experiment is purposeful,through which students can master the method of preparation of granular materials specimen for GDS triaxial test,the operation of the bending element system and determine the determination of wave velocity variation with frequency in granular materials.It cultivates the students’hands-on ability,research consciousness and teamwork ability,and lays a solid theoretical foundation for their future study and work.
作者
童立红
胡椿华
徐长节
TONG Lihong;HU Chunhua;XU Changjie(School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China)
出处
《实验室研究与探索》
CAS
北大核心
2022年第4期211-213,253,共4页
Research and Exploration In Laboratory
基金
江西省自然科学基金项目(20202BAB204025)
江西省高等学校教学改革研究课题(JXJG-20-5-1)。
关键词
GDS三轴试验
教学实验
弯曲元
玻璃珠
频率
色散关系
GDS triaxial test
teaching experiment
bending element
glass beads
frequency
dispersion relationship
