环氧树脂-水泥复合改良加固膨胀土试验研究  

Experimental study on expansive soil reinforced with cement and epoxy resin

作　　者：王建立 张家铭[2] 米敏 周峙[2] 罗易 袁超 WANG Jianli;ZHANG Jiaming;MI Min;ZHOU Zhi;LUO Yi;YUAN Chao(Anhui Transportation Holding Group Co.,Ltd,Hefei 230088,China;Faculty of Engineering,China University of Geosciences,Wuhan 430074,China)

机构地区：[1]安徽省交通控股集团有限公司,安徽合肥230088 [2]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《人民长江》2019年第10期209-215,共7页Yangtze River

基　　金：安徽交通控股集团交通科技攻关项目(JKKJ-2017-20);安徽省2018年度交通运输科技进步计划(2018030);中央高校基本科研业务费专项资金资助(CUG160203)

摘　　要：传统的单因子改良膨胀土方法虽可改善其胀缩性能,但对土体胶结性和力学性质等方面贡献不大。利用环氧树脂和水泥对安徽沿江地区膨胀土进行复合改良加固,并对改良后土样进行了力学性质试验和微观结构观察。结果表明:复合加固样中,在固定聚灰比为0.6时,10%是较优的水泥配比,在此配比下改良土样的抗压强度、破坏应变及弹性模量均达到峰值。结合电镜扫描结果可知,在水泥配比为10%时,聚合物和水泥各自的网络结构相互贯穿,相互依托,组成空间的三维立体交叉结构,增强了土样的复合效应,宏观上则表现为土样力学性能得到显著改善。在强度和低标号混凝土相当甚至更优的同时,复合加固土样具有密度更小、延展性更好的优点。相关成果可推广到类似工程膨胀土加固中。Although the traditional method of improving expansive soil with single-factor can improve its expansion and contraction performance, it has little contribution to the cementation and mechanical properties of the soil. Epoxy resin and cement were employed to improve and reinforce the expansive soil in the area along the Yangtze River in Anhui Province, the mechanical properties and microstructure of the improved soil samples were then tested. The results showed that in the epoxy resin-cement stabilized samples, 10% is an optimal cement ratio when the polymer-cement ratio is 0.6. Under this ratio, the compressive strength, failure strain and elastic modulus of the samples reached maximum. Through the microstructure scanning, it can be concluded that when the cement ratio is 10%, the network structures of the polymer and the cement linked with each other, forming a three-dimensional cross structure in the space, which enhanced the composite effect of the soil samples. Macroscopically, the mechanical properties of improved soil samples have been significantly improved. Not only the strength of epoxy resin-cement stabilized samples is equal to or even better than that of normal concrete, but also they have the advantages of lighter density and better ductility. The research results could be extended to the practical application of engineering.

关 键 词：膨胀土 环氧树脂 水泥 复合加固 无侧限抗压强度 弹性模量 微观结构 

分 类 号：TU443[建筑科学—岩土工程]