玻璃纤维加筋砂土剪切强度特性研究  

Shear strength characteristics of glass fiber reinforced sandy soil

作　　者：李丽华[1] 万畅[1] 刘永莉[1] 崔飞龙[1] 陈艳君[1] 高萌[1] LI Lihua WAN Chang LIU Yongli CUI Feilong CHEN Yanjun GAO Meng(School of Civil Engineering and Architecture, Hubei University of Technology, Wuhan 430068, Chin)

机构地区：[1]湖北工业大学土木工程与建筑学院,湖北武汉430068

出　　处：《武汉大学学报（工学版）》2017年第1期102-106,共5页Engineering Journal of Wuhan University

基　　金：岩土力学与工程国家重点实验室开放基金(编号:Z014011);国家自然科学基金项目(编号:51308197;51678224);湖北省桥梁安全监控技术及装备工程技术研究中心基金(编号:QLZX2014016);校优秀博士基金(编号:BSQD12055)

摘　　要：纤维作为一种土体加筋材料,在土体中所表现出的力学特性有别于一般的土工合成材料.为了深入了解纤维加筋土的剪切强度特性,通过土工合成材料直剪仪,以砂土为研究对象、玻璃纤维为加筋材料,在控制含水量、纤维掺量和相对密实度条件下开展一系列的直剪试验.试验结果表明:纤维加筋砂土的内摩擦角随含水量的增大而减小,黏聚力没太大变化;玻璃纤维能有效提高砂土的剪切强度和破坏韧性,临界纤维掺量为0.4%;纤维加筋砂土的剪切强度和剪切强度参数(黏聚力和内摩擦角)随相对密实度的增加而增加.总体而言,低含水量、0.4%纤维掺量和高相对密实度能有效改善玻璃纤维加筋砂土的剪切强度特性.Fiber, as a reinforcement material of soil, its mechanical properties is different with the common geosyntheties in the soil. In order to have a thorough understanding of shear strength characteristics of fi- ber reinforced soil, in this paper, through geosynthetics direct shear apparatus, soil and glass fiber were used as research object and reinforcement material, respectively. A series of direct tests were performed at controlled water content, fiber content and relative density conditions. The test results show that internal friction angle of reinforced soil decreases with increasing water content; and the variation of cohesion is small. The inclusion of fiber in soil can significantly enhance the shear strength and fracture toughness of soil; and the critical fiber content is 0.4%. The shear strength and shear strength paramaters increase with in creasing the relative density. In general, the shear strength characteristics of glass fiber reinforced soil can be im- proved effectively at low water content, fiber content 0.4% and high relative density conditions.

关 键 词：玻璃纤维 加筋土 砂土 抗剪强度 

分 类 号：TU411.7[建筑科学—岩土工程]