废弃轮胎胶粉改良膨胀土的抗剪强度研究  

RESEARCH ON SHEAR STRENGTH OF EXPANSIVE SOILS REINFORCED WITH WASTE TIRE POWDERS

作　　者：孙树林[1,2] 魏永耀[2] 张鑫[2] 

机构地区：[1]河海大学水文水资源与水利工程科学国家重点实验室,江苏南京210098 [2]河海大学地球科学与工程系,江苏南京210098

出　　处：《岩石力学与工程学报》2009年第A01期3070-3075,共6页Chinese Journal of Rock Mechanics and Engineering

基　　金：河海大学水文水资源与水利工程科学国家重点实验室开放研究基金项目(2005408911);留学回国人员科研基金资助项目(20071108)

摘　　要：为了提高资源的循环利用,减少废弃轮胎对环境的潜在影响,对废弃轮胎胶粉改良膨胀土的强度特性进行研究。在不同含水量15%,18%,21%下,以不同比例废弃轮胎胶粉10%,20%,30%与膨胀土混合后进行固结快剪实验。在试验过程中综合考虑法向应力,胶粉含量对膨胀土抗剪强度的影响,以及剪切位移与对应的剪应力的关系,总结出膨胀土改良后的抗剪强度变化特征。结果表明内摩擦角和膨胀土的抗剪强度随废弃轮胎胶粉含量的增加而增大,内摩擦角的变化不大,黏聚力的变化较为显著。同时证实了废弃轮胎胶粉改良膨胀土效果较为显著,为膨胀土改良提供了一个新的改良方法。In order to increase the use of the recycled resources and reduce potential impact of the wasted tires on the environment, the strength of expansive soil improved by wasted tire rubber powder was studied. The expansive soil is mixed with wasted tire rubber powder in a different proportions of 10, 20, and 30%, and a different water proportions, which are about 15%, 18% and 21%. Then consolidation fast shear tests were conducted. During the tests, impact of normal stress and the amount of rubber powder on the shear strength of the expensive soil are considered. The relationship between shear displacement and the corresponding shear stress relationship are also taken into account. Tests present the characteristics of the improved expansive soil shear strength. It was shown that the internal friction angle and the shear strength of the expansive soil increases as the amount of the wasted tire rubber powder increases; and the internal friction does not have a remarkable change, while the cohesion changes obviously. It confirms the assumption that wasted tire rubber powder can improve the expansive soil greatly. It provides a new improving method to reduce the engineering disaster caused by the expansive soil.

关 键 词：土力学 废弃轮胎胶粉 膨胀土 抗剪强度 黏聚力 内摩擦角 

分 类 号：TU43[建筑科学—岩土工程]