纳米石墨粉改良红黏土试验  

Experiment of Modified Red Clay by Graphite Nanoparticles

作　　者：李佳明 陈学军[1,2] 杨越 黄翔[1,2] 宋宇[1,2] LI Jiaming;CHEN Xuejun;YANG Yue;HUANG Xiang;SONG Yu(College of Civil Engineering & Architecture,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of Mechanics & Geotechnical Engineering,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]桂林理工大学土木与建筑工程学院,广西桂林541004 [2]桂林理工大学广西岩土力学与工程重点实验室,广西桂林541004

出　　处：《河南科技大学学报（自然科学版）》2019年第5期69-73,80,M0006,共7页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家自然科学基金项目(41762022,41262011);桂林市科技开发项目(20170222);广西中青年教师基础能力提升项目(2018KY0239)

摘　　要：为了研究纳米石墨粉对桂林红黏土的改良效果,通过室内试验,分析了改良土的物质组成、力学性质及微观结构。研究结果表明:掺入纳米石墨粉后,红黏土矿物中高岭石的质量分数增加,石英的质量分数减少,且大部分氧化物的质量分数增加。随着垂直压力的增加,重塑红黏土的抗剪强度逐渐增加。纳米石墨粉使红黏土的抗剪强度、黏聚力、内摩擦角均得到了提高,抗剪强度增大程度为3.4%~16.6%。改良后,红黏土表面成层叠状,凹凸程度降低。纳米石墨粉将独立、相邻的土颗粒粒团联结在一起,使红黏土内部孔隙变小,结构骨架更稳定。In order to study the improvement effect of graphite nanoparticles on Guilin red clay,the material composition,mechanical properties and microstructure of the improved soil were analyzed through laboratory tests.The results indicate that graphite nanoparticles increase the mass fraction of kaolinite in modified red clay,while decrease the mass fraction of quartz.The mass fraction of most oxides increases.With the increase of vertical pressure,the shear strength of the remolded red clay gradually increases.Graphite nanoparticles improve the shear strength,cohesion and internal friction angle,and the shear strength increases by 3.4%~16.6%.The surface of modified red clay is laminated with the concave-convex degree decreasing.Graphite nanoparticles powder binds independent and adjacent soil particles,which decreases the internal pores and stabilizes the structural framework.

关 键 词：红黏土 纳米石墨粉 矿物成分 力学性质 微观结构 

分 类 号：TU411[建筑科学—岩土工程]