STC加筋砂水平循环剪切与竖向激振特性试验研究

Experimental Study on Horizontal Cyclic Shear and Vertical Excitation Behavior of STC Reinforced Sand

随着中国汽车工业的发展,大量废旧轮胎带来的＂黑色污染＂问题日益显著。提出一种采用废旧轮胎柱（Scrap tire columns,STC）的加筋土结构,并初步探究其作为基础减隔振材料的可行性。通过室内水平循环剪切试验和竖向激振试验研究STC加筋砂（STCRS）的水平循环剪切和竖向激振特性。结果表明,最大剪应变为1%时STCRS的等效阻尼比未加筋前增加约10%,等效动剪切模量减小20%~25%,水平向减振性能得以提高;STCRS的竖向加速度衰减呈现出速度快、幅值大的特点,竖向减振效果较未加筋砂显著提高。STC加筋砂作为基础减振材料是可行的,且为原形废旧轮胎的资源化利用提供新思路。

With the rapid development of the automotive industry in China,＂black pollution＂caused by scrap tires has become increasingly significant.A reinforcing earth structure using scrap tire columns（STC）is presented in the current research.Horizontal cyclic shear tests and vertical excitation tests were conducted to validate the effectiveness of scrap tire columns reinforced sand（STCRS）on horizontal and vertical damping.The results of the horizontal shear tests show that when the maximum shear strain is 1%,the equivalent damping ratio of STCRS increased by about10% more than the sand itself,and the shear modulus decreased by 20% ~25%,improving the horizontal damping performance.In the vertical vibration tests,the acceleration attenuation showed characteristics of fast speed and large amplitude,indicating that STCRS had a significant damping effect compared to unreinforced sand.STC reinforced sand as a material for seismic isolation is feasible,and is also a new use for scrap tire resources.