环氧树脂-玻璃纤维对水泥改性膨胀土的加固机理试验研究  

Experimental study on strengthening mechanism of adding epoxy resin and glass fiber to cement modified expansive soil

作　　者：袁超 周峙[1,2] 张家铭 王少锋[3,4] 许魁 YUAN Chao;ZHOU Zhi;ZHANG Jiaming;WANG Shaofeng;XU Kui(Faculty of Engineering,China University of Geosciences,Wuhan 430074,China;China University Of Geosciences,Academic Innovation Base of Engineering Geology and Geotechnical Protection&Engineering Research Center of Rock-Soil Drilling&Excavation and Protection,Ministry of Education,Wuhan 430074,China;Anhui Transportation Holding Group Co.,Ltd.,Hefei 230088,China;Anhui Transportation Consulting&Design Institute Co.,Ltd.,Hefei 230088,China)

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074 [2]中国地质大学(武汉)工程地质与岩土防护学术创新基地&岩土钻掘与防护教育部工程研究中心,湖北武汉430074 [3]安徽省交通控股集团有限公司,安徽合肥230088 [4]安徽省交通规划设计研究总院股份有限公司,安徽合肥230088

出　　处：《武汉大学学报（工学版）》2021年第8期709-716,724,共9页Engineering Journal of Wuhan University

基　　金：中央高校基本科研业务费专项资金资助项目(编号:1810491A24);中国地质大学(武汉)岩土钻掘与防护教育部工程研究中心开放基金(编号:201803);安徽交通控股集团交通科技攻关项目(编号:JKKJ-2017-20);安徽省2018年度交通运输科技进步计划(编号:2018030)。

摘　　要：以膨胀土与水泥的重量比为指标,研究环氧树脂、玻璃纤维和水泥对膨胀土力学性质和微观结构的影响。结果表明,环氧树脂与水泥改性膨胀土的最小配比为0.3,最佳配比为0.6。在此范围内,试样的抗压强度为水泥改性膨胀土的17.01倍,抗弯强度为水泥改性膨胀土的3.09倍。在最佳树脂/固体质量比条件下(玻璃纤维和玻璃纤维粉含量分别为2%和3%),玻璃纤维通过基体间桥接作用延缓微裂纹发展,提高复合材料的延性和能量吸收的能力,显著提高试样的抗弯强度,使脆性破坏转变为塑性破坏,提高了试样的力学性能。The effect of adding epoxy resin, glass fibres and cement on the mechanical parameters and microstructure properties of expansive soils are studied with the weight ratio of expansive soil and cement as the index. The results show that the minimum ratio of epoxy resin to cement modified expansive soil should be 0.3,and the optimal ratio should be 0.6. In this range, the compressive strength and flexural strength of the specimens reinforced by epoxy resin, glass fiber and cement are 17.01 times and 3.09 times as those of expansive soils only reinforced by cement, respectively. At the optimum resin/solid mass ratio( the contents of glass fibre and glass fibre powder are 2% and 3%, respectively), glass fibre can significantly improve the ductility and energy absorption ability of composite materials by effect of matrix bridging and delaying the development of micro-cracks. The brittle failure of the specimens is changed into ductile failure, and the mechanical properties of the sample are improved.

关 键 词：膨胀土 环氧树脂 玻璃纤维 力学性能 

分 类 号：TU443[建筑科学—岩土工程]