橡胶颗粒-砂混合物动剪切模量的试验研究

Study of dynamic shear modulus of granulated rubber-sand mixture

橡胶与土的混合物已经广泛用于边坡、挡土墙以及路基回填中,将其当作一种隔震材料用于基础隔震中去,从基础隔震的角度来研究橡胶颗粒-砂混合物的动力性能。利用循环单剪仪测出不同固结压力下不同配比的橡胶颗粒-砂混合物的动剪模量,绘出动剪模量随动剪应变的变化曲线,并对其进行比较,研究表明:橡胶颗粒的存在可以有效地降低橡胶颗粒-砂混合物的动剪模量,橡胶颗粒-砂混合物的动剪模量随固结压力增大而增大。

Rubber mixed with soil are applicable in lightweight fills for slopes, retaining walls, and embankments, utilizing it as a kind of seismic isolation material in base isolation, and see if it can produce fine seismic isolation effect. This paper researches on the dynamic properties of granulated rubber-sand mixtures from the angle of base seismic isolation. The dynamic shear modulus of the different proportions of the mixtures under different consolidation pressures were measured using cyclic simple shear test. And the curves of G-γ（where G is shear modulus, yis shear strain） were obtained and compared. Results show that the granulated rubber can efficiently reduce the dynamic shear modulus of the rubber-sand mixture, which increases with the increase of the consolidation pressure.