粗颗粒质量分数对石英砂动力变形特性影响的试验  

Dynamic characteristics tests of quartz sand with considering coarse particle content

作　　者：杨鹏 金丹丹[1] 赵俣 王炳辉[2] YANG Peng;JIN Dandan;ZHAO Yu;WANG Binghui(Faculty of Civil Engineering and Mechanics,Jiangsu University,Zhenjiang,Jiangsu 212013,China;School of Architecture and Civil Engineering,Jiangsu University of Science and Technology,Zhenjiang,Jiangsu 212005,China)

机构地区：[1]江苏大学土木工程与力学学院,江苏镇江212013 [2]江苏科技大学土木工程与建筑学院,江苏镇江212005

出　　处：《江苏大学学报（自然科学版）》2022年第2期242-248,共7页Journal of Jiangsu University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51708256)。

摘　　要：利用能同步测试动剪切模量和动弹性模量的共振柱试验系统,采用由粗颗粒(1.0~2.0 mm)和细颗粒(0.1~0.5 mm)组成的砂土粒组,研究了粗颗粒质量分数变化对石英砂动力变形特性的影响.同时,基于不同应变下的动剪切模量和动弹性模量试验结果,建立了不同应变下动泊松比的迭代计算公式,求取了小应变范围内的动泊松比.研究结果表明:随着粗颗粒质量分数的增加,在应变较小时,动剪切模量和动弹性模量均呈现出先增加后减小的变化趋势,且当粗颗粒质量分数约为50%时,由于两种粒径的砂粒接触状态达到最佳状态,动剪切模量和动弹性模量均达到最大值;在小应变由10^(-6)增大到10^(-4)过程中,动泊松比范围从0.1~0.2增大到0.2~0.3,增大效果显著.The influence of coarse-grain content on the dynamic deformation characteristics of quartz sand was investigated by resonance column test system to simultaneously test dynamic shear modulus and dynamic elastic modulus for particle group of 1.0-2.0 mm coarse grain and 0.1-0.5 mm fine grain.Based on the test results of dynamic shear modulus and dynamic elastic modulus under different strains,the iterative calculation method for dynamic Poisson′s ratio under different strains was established,and the dynamic Poisson′s ratio in a small strain range was calculated.The results show that with the increasing of coarse particle content,the dynamic shear modulus and the dynamic elastic modulus are increased first with latter decreasing when the strain is small.When the coarse particle content is about 50%,the dynamic shear modulus and the dynamic elastic modulus reach the maximum values because the contact states of the two grains of sand reach the best states.In the process of small strains from 10^(-6) to 10^(-4),the dynamic Poisson′s ratio is increased from 0.1-0.2 to 0.2-0.3 with significant increasing.

关 键 词：石英砂 动弹性模量 动剪切模量 动泊松比 共振柱试验 

分 类 号：TU435[建筑科学—岩土工程]