橡胶-粉土混合土动力特性试验研究  

Experimental study on dynamic characteristics ofrubber-silt mixed soil

作　　者：何顺锋 曹宇春 金泽平 HE Shunfeng;CAO Yuchun;JIN Zeping(School of Civil Engineering and Architecture,Zhejiang University of Science and Technology,Hangzhou 310023,Zhejiang,China)

机构地区：[1]浙江科技大学土木与建筑工程学院,杭州310023

出　　处：《浙江科技学院学报》2024年第3期239-248,共10页Journal of Zhejiang University of Science and Technology

基　　金：国家自然科学基金项目(40406019);浙江省公益性技术应用研究计划项目(2014C33037)。

摘　　要：【目的】为了解橡胶颗粒掺入粉土中对其动力特性的影响,对橡胶粉土混合土进行动力特性研究。【方法】将不同体积分数(0%、5%、10%、20%)的橡胶颗粒掺入粉土试样中,在不同竖向应力作用下,采用GDS动态循环单剪试验系统,对混合土的动剪切模量和阻尼比进行研究。【结果】混合土的动剪切模量随竖向应力的增大而增大,随橡胶颗粒体积分数和动剪应变的增大而减小;阻尼比随竖向应力的增大而减小,随动剪应变的增大而增大;橡胶颗粒体积分数对阻尼比的影响分为两个阶段,在动剪应变小于0.1%时,阻尼比随着橡胶颗粒体积分数的增大而增大,而在动剪应变大于0.1%时,阻尼比随着橡胶颗粒体积分数的增大而减小。【结论】本研究结果可为废旧轮胎橡胶颗粒在实际工程中的应用提供参考。[Objective]In order to understand the effect of mixing rubber with silt on its dynamic characteristics,the dynamic characteristics of rubber-silt mixed soil were studied.[Method]Rubber particles with different volume fractions(0%,5%,10%,20%)were mixed into the silt sample,and under different vertical stresses,the dynamic shear modulus and the damping ratio of the mixed soil were studied by applying the GDS dynamic cyclic simple shear test system.[Result]The dynamic shear modulus of the mixed soil increases with the increase of vertical stress,and decreases with the increase of rubber volume fraction and dynamic shear strain;the damping ratio decreases with the increase of vertical stress and increases with the increase of dynamic shear strain.The influence of rubber particle volume fraction on the damping ratio is divided into two stages:when the shear strain is less than 10-3,the damping ratio increases with the increase of rubber volume fraction,and when the shear strain is greater than 10-3,the damping ratio decreases with the increase of rubber volume fraction.[Conclusion]The results of this study can provide reference for the application of waste tire rubber particles in practical engineering.

关 键 词：橡胶粉土混合土 循环单剪试验 动剪切模量 阻尼比 

分 类 号：TU435[建筑科学—岩土工程]