| 砂-聚苯乙烯颗粒轻质混合填料的剪切强度特性 |
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| 引用本文： | 施文明,廖军,刘丹,王冰.砂-聚苯乙烯颗粒轻质混合填料的剪切强度特性[J].防灾减灾工程学报,2013(3):295-299. |
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| 作者姓名： | 施文明 廖军 刘丹 王冰 |
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| 作者单位： | 云南城投置业股份有限公司;西南交通大学土木工程学院;中国建筑科学研究院;江苏省建筑科学研究院有限公司岩土工程研究所 |
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| 基金项目： | 中央高校基本科研业务费专项(2010B15014);江苏省普通高校研究生科研创新计划项目(CX10B-207Z)资助 |
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| 摘 要： | 砂-聚苯乙烯颗粒填料是一种以砂土和聚苯乙烯颗粒组成的轻质混合填料。通过轻质填料的直剪试验,研究其剪切强度的特性、强度影响因素及其机制。研究发现,轻质填料的剪切强度具有最优含水率(本文为10%),若大于或者小于最优含水率,剪切强度都将减小;轻质填料的剪切强度主要由4个分量构成:颗粒滑动、剪胀、挤碎和重新排列,以及因聚苯乙烯收缩而引起的颗粒移动和重排分量;轻质填料的剪切强度还受聚苯乙烯含量及法向应力(或围压)的影响,其剪切强度随聚苯乙烯含量的增加而减小,随法向应力的增加而增加;轻质填料的内摩擦角随着配比的增加而减小,凝聚力随配比的增加而增大。
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| 关 键 词： | 砂-聚苯乙烯颗粒 轻质填料 剪切强度 内摩擦角 强度机理 |
Shear Strength Behavior of Sand-EPS Beads Lightweight Fill |
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| SHI Wen-ming,LIAO Jun,LIU Dan,WANG Bing.Shear Strength Behavior of Sand-EPS Beads Lightweight Fill[J].Journal of Disaster Prevent and Mitigation Eng,2013(3):295-299. |
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| Authors: | SHI Wen-ming LIAO Jun LIU Dan WANG Bing |
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| Institution: | 1.Yunnan Metropolitan Real Estate Development Co.,Ltd,Kunming 650200,China; 2.School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China; 3.China Academy of Building Research,Beijing 100013,China; 4.Research Institute of Geotechnical Engineering,Jiangsu Research Institute of Building Science Co.,Ltd,Nanjing 210008,China) |
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| Abstract: | Sand-EPS beads lightweight fill is composed of sand and EPS beads.Based on direct shear tests,the shear strength behavior and influence factors are presented in this paper.The best water content corresponding with the highest shear strength is 10% for this lightweight fill.The shear strength is composed of the following parts:(a) particle sliding;(b) dilatancy;(c) particle breakage;(d) particle rearrangement;and(e) contraction of EPS beads.Shear strength of the lightweight fill decreases with the increasing of the EPS ratio and increases with the increasing of the normal stress.Besides,the internal friction angle of the lightweight fill decreases with the increasing of the EPS ratio,and the cohesion increases with the increasing of the EPS ratio. |
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| Keywords: | sand-EPS-beads lightweight fills shear strength internal friction angle strength mechanism |
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