Dynamic behavior study of saturated rubber-sand mixture under torsional shear loading
To study the dynamic characteristics of the rubber-sand mixture,a new type of civil engineering material,a series of hollow torsional shear tests are conducted on the rubber-sand mixture which is mixed with rubber particles from wasted tire and sand.The results show that the dynamic pore water pressure development pattern of rubber-sand mixture with low rubber content(Rf=5％～10％)is similar to pure sand,with a development pattern of"fast growth to linear growth to rapid growth".The dynamic pore water pressure of rubber-sand mixture with high rubber content(Rf=20％～30％)presents a"rapid growth to stable growth"development pattern.The liquefaction cycles of the rubber-sand mixture increase with the rubber content,and the rubber-sand mixture does not liquefy when Rf=30％.The effective stress path of rubber-sand mixture develops in three stages under cyclic torsional shear load,and the state of mixture changes constantly in shear shrinkage and shear dilatancy during the liquefaction process.The stress-strain hysteresis loop of the mixture is centrosymmetric,and the slope of hysteresis loop decreases gradually with the rubber content,which shows that the stiffness of mixture decreases.The generalized shear strain decreases with the rubber content,and the rubber-sand mixture with the 30％rubber content has the strongest resistance to deformation.The mixture with higher rubber content has a smaller hysteresis circle area,and the mixture tends to be elastic materials,with better deformation recovery ability,longer liquefaction period,and greater accumulated dissipated energy.
rubber-sand mixturehollow torsional shear testliquefaction characteristiccumulative energy dissipationgranular rubber content
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