胶结液浓度对改良膨胀土强度及微观结构的影响  

The influence of cemented fluid concentration on strength and microstructure of improved expansive soil

作　　者：黄莹 李珍玉[1] 郭晓东 罗深平 屈星 HUANG Ying;LI Zhenyu;GUO Xiaodong;LUO Shenping;QU Xing(School of Civil Engineering,Central South University of Forestry and Technology,Changsha,Hunan 410004,China;Guangdong Hualu Transportation Technology Co.,Ltd,Guangzhou,Guangdong 510420,China)

机构地区：[1]中南林业科技大学土木工程学院,湖南长沙410004 [2]广东华路交通科技有限公司,广东广州510420

出　　处：《湖南城市学院学报（自然科学版）》2024年第3期1-6,共6页Journal of Hunan City University:Natural Science

基　　金：国家自然科学基金项目(50978097)。

摘　　要：为研究胶结液浓度对微生物诱导碳酸钙沉淀(Microbial Induced Calcite Precipitation,MICP)技术改良膨胀土的强度特性和微观结构特征的影响规律,本文对未改良及改良后的膨胀土进行了直接剪切、无侧限抗压、扫描电子显微镜成像(SEM)等试验研究。研究结果表明:1)随着胶结液浓度的增大,改良膨胀土的抗剪强度和无侧限抗压强度均得到了明显提高,且呈先增后减趋势;2)微生物的矿化明显改变了膨胀土的微观结构特征,使其强度特性和亲水性得到了有效改善;3)当胶结液浓度为1 mol/L时,改良膨胀土无侧限抗压强度达到最大值。In order to study the influence of cementing solution concentration on the strength characteristics and microstructure characteristics of expansive soil improved by MICP technology,direct shear test,unconfined compression test and scanning electron microscope imaging(SEM)test were carried out on unimproved and improved expansive soil.The results show that:1)with the increase of the concentration of cementing solution,the shear strength and unconfined compressive strength of the improved expansive soil have been significantly improved,showing a trend of“first increase and then decrease”;2)The mineralization of microorganisms significantly alters the microstructure characteristics of expansive soil,resulting in the effective improvement of its strength and hydrophilicity;3)The unconfined compressive strength reaches its maximum value when the concentration of cementing solution is 1 mol/L.

关 键 词：胶结液 MICP技术 膨胀土 强度特性 微观结构 

分 类 号：TU411[建筑科学—岩土工程]