摘要
废弃橡胶可以较好地改良膨胀土的力学性能及胀缩特性,本试验考虑不同初始条件对橡胶加筋膨胀土(Expansion Soil-Rubber,ESR)动剪切模量影响,采用NGZ-20共振柱试验机开展不同含水率、橡胶掺量和颗粒粒径的系列研究,得到了不同初始条件下ESR的最大动剪切模量、动剪切模量与剪应变的变化规律。试验结果表明:随橡胶掺量和含水率的增加,加筋土的最大动剪切模量降低;在1×10^(-6)<γ<1×10^(-4)剪应变范围内,动剪切模量衰退明显,橡胶掺量变化较含水率改变对动剪切模量衰减影响更为显著;橡胶粒径对最大动剪切模量影响明显,但对动剪切模量衰减曲线影响不大。试验所得动力参数可以为橡胶改良膨胀土工程应用提供参考。
Waste rubber can better improve the mechanical properties and expansion and contraction characteristics of expansive soil.In this experiment,considering the influence of different initial conditions on the dynamic shear modulus of Expansion Soil-Rubber(ESR),the NGZ-20 resonance column testing machine was used to carry out a series of studies on different moisture content,rubber content and particle size.The maximum dynamic shear modulus,dynamic shear modulus and shear strain of ESR under different initial conditions were obtained.The test results show that the maximum dynamic shear modulus of reinforced soil decreases with the increase of rubber content and water content.In the strain range of 1×10^(-6)<γ<1×10^(-4),the dynamic shear modulus declines obviously,and the change of rubber content has more significant effect on the dynamic shear modulus than the change of water content.The influence of rubber particle size on the maximum dynamic shear modulus is obvious,but has little effect on the attenuation curve of dynamic shear modulus.The dynamic parameters obtained from the test can provide reference for the engineering application of rubber modified expansive soil.
作者
王勇
时伟
张瑾
WANG Yong;SHI Wei;ZHANG Jin(School of Civil Engineering,Qingdao University of Technology,Qingdao 266525,China)
出处
《青岛理工大学学报》
CAS
2024年第2期20-27,42,共9页
Journal of Qingdao University of Technology
基金
国家自然科学基金资助项目(41702320)。
关键词
膨胀土
橡胶加筋
共振柱试验
动剪切模量
剪应变
expansive soil
rubber reinforcement
resonance column test
dynamic shear modulus
shear strain
