橡胶-砂轻质填料压缩特性及颗粒破碎研究  

Investigation on compression and particle breakage characteristics of rubber-sand lightweight filler

作　　者：刘路路 蔡国军[1] 刘晓燕[1] LIU Lulu;CAI Guojun;LIU Xiaoyan(Institute of Geotechnical Engineering,Southeast University,Nanjing,Jiangsu 211189,China)

机构地区：[1]东南大学岩土工程研究所,江苏南京211189

出　　处：《中国矿业大学学报》2020年第5期882-888,共7页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(41672294,41877231);江苏省研究生科研创新计划(KYCX19-0098);东南大学优秀博士学位论文培育基金项目(YBPY1926)。

摘　　要：为了研究橡胶-砂轻质填料的压缩与颗粒破碎特性,采用一维压缩试验、颗粒破碎试验和电镜扫描技术,分析了橡胶颗粒占比和竖向应力对橡胶-砂轻质填料的孔隙比、压缩系数、回弹模量和颗粒破碎的影响.结果表明:当橡胶颗粒占比超过50%(或低于50%)时,孔隙比曲线呈加速降低、减速降低和缓慢降低(或加速降低、缓慢降低和稳定阶段)3阶段变化.根据压缩系数的变化规律,将橡胶-砂轻质填料划分为3类,即低压缩,中压缩和高压缩材料.此外,橡胶-砂轻质填料的塑性应变大于弹性应变,弹性应变和塑性应变之间的差距随橡胶颗粒占比的增加而逐渐增加.颗粒破碎值与橡胶颗粒占比呈现出良好的线性关系.不同橡胶颗粒占比下橡胶-砂轻质填料在压缩过程中存在不同的力链形式.橡胶-砂轻质填料压缩特性及颗粒破碎的研究能够为基础工程轻质土的设计与施工提供理论支撑.To study the compression and particle breakage characteristics of rubber-sand lightweight filler, the effects of rubber particle content and vertical stress on void ratio, compression coefficient, resilient modulus and particle breakage of rubber-sand lightweight filler were analyzed using one-dimensional compression test, particle breakage test and scanning electron microscope. The results show that when the rubber particle content is more than 50%(or less than 50%), the void ratio curve changes in three stages: accelerated decrease, decelerated decrease and slow decrease(or accelerated reduction, slow reduction and stable stage).According to the change law of compression coefficient, the rubber-sand lightweight filler is divided into three categories, that is low compression, medium compression and high compression materials. In addition, the plastic strain of the rubber-sand lightweight filler is greater than the elastic strain, and the gap between the elastic strain and the plastic strain increases gradually with the increase of the rubber particle content. A good linear relationship between particle breakage value and rubber particle content can be observed. There are different force chains in the compression process of rubber-sand lightweight fillers with different rubber contents. Investigation on compression and particle breakage characteristics of rubber-sand lightweight filler can provide theoretical support for the design and construction of light soil in foundation engineering.

关 键 词：废旧轮胎 橡胶-砂轻质填料 压缩特性 微观机理 颗粒破碎 

分 类 号：TU411[建筑科学—岩土工程]