瓜尔胶处理铝土矿矿泥强度特性及微观机制  

Strength Characteristics and Microscopic Mechanism of Bauxite Slime Treated by Guar Gum

作　　者：施航向 蒙剑坪[1,2] 纪静茹 颜荣涛 SHI Hangxiang;MENG Jianping;JI Jingru;YAN Rongtao(School of Civil Engineering and Architecture,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering,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]广西岩土力学与工程重点实验室,广西桂林541004

出　　处：《金属矿山》2024年第4期236-243,共8页Metal Mine

基　　金：广西科技基地和人才专项项目(编号:桂科AD20325010);广西岩土力学与工程重点实验室主任基金项目(编号:桂科岩21-XT-02)。

摘　　要：生物聚合物作为一种新型环境友好的土壤处理及改良材料,即使使用量很小,也能对土体具有显著的强化作用,因此近年来得到了广泛的运用。本文对不同胶土比(0%、1%、1.5%和2%)瓜尔胶处理的铝土矿矿泥试样进行了界限含水率测试、快剪试验、核磁共振试验(NMR)和扫描电镜(SEM)等室内试验。试验结果表明,随着生物聚合物的增加,铝土矿矿泥的液塑限及抗剪强度均有所提高,其中2%瓜尔胶含量的铝土矿泥液限提升了26%,黏聚力提升了182%。NMR试验表明了瓜尔胶能够使铝土矿矿泥试样的含水量增大,且其内部会出现大孔隙。而SEM图证实了瓜尔胶和铝土矿矿泥颗粒形成瓜尔胶—铝土矿矿泥基质,从而提高了液塑限及抗剪强度。Biopolymers,as a novel environmentally friendly soil treatment and improvement material,have gained exten-sive applications in recent years,even in small quantities,due to their significant strengthening effect on soil.In this study,la-boratory experiments were conducted on bauxite slime samples treated with different concentrations(0%,1%,1.5%,and 2%)of guar gum.These experiments included testing for Atterberg limits,quick shear tests,nuclear magnetic resonance(NMR)ex-periments,and scanning electron microscopy(SEM).The experimental results indicate that with the increase in biopolymer content,both the liquid limit and shear strength of bauxite slime improved significantly.Specifically,the bauxite slime treated with 2%guar gum exhibited a 26%increase in liquid limit and a remarkable 182%increase in cohesion.NMR experiments re-vealed that guar gum could increase the moisture content of bauxite slime samples and create large internal pores within them.Additionally,SEM images confirmed the formation of a guar gum-bauxite slime matrix,thereby enhancing both the liquid limit and shear strength.

关 键 词：抗剪强度 液塑限 瓜尔胶 微观机制 铝土矿矿泥 

分 类 号：TD313[矿业工程—矿井建设]