Study on the effect of shear properties of mixed soil with tyre chips
[Objective]To solve the problem of poor engineering properties of clay and low utilisation of waste tyres,[Methods]tyre chips are added to clay and direct shear tests are carried out on the tyre chip-clay interface to investigate the effect of tyre chip content on the shear properties of clay.A series of cyclic shear tests are carried out to analyse the effects of different tyre chip contents,vertical stresses and shear amplitudes on the shear stiffness and damping ratio of the tyre chip-clay interface.[Results]The results show that the incorporation of tyre chips can increase the shear strength,internal friction angle,damping ratio and shear stiffness of the clay,but reduce the cohesion.Among them,the 5％tyre chip content mix has the best shear strength,better shear stiffness and damping ratio.The vertical stress and shear amplitude have a greater effect on the shear stiff-ness and damping ratio at the shear interface.An increase in vertical stress and shear amplitude leads to an increase in shear stiffness and a decrease in damping ratio at the shear interface.[Conclusion]The results demonstrate that the incorporation of tyre chips can make the clay present certain seismic isolation and damping properties,but what tyre chips incorporation can make the clay have relatively better shear strength and damping properties,and the mechanism of reinforcement effect of tyre chips needs further study.
tyre chipsshear strengthshear amplitudeshear stiffnessdamping ratioinfluence factor
万方数据
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