基于低pH一相注浆法的微生物固化土体试验研究  

Experimental study on microbial solidification of soil based on low pH one-phase grouting method

作　　者：崔广芹 张航 朱巩硕 张成志 公衍德 CUI Guangqin;ZHANG Hang;ZHU Gongshuo;ZHANG Chengzhi;GONG Yande(College of Civil Engineering,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China)

机构地区：[1]内蒙古科技大学土木工程学院,内蒙古包头014010

出　　处：《山东大学学报(工学版)》2025年第1期117-124,137,共9页Journal of Shandong University(Engineering Science)

基　　金：内蒙古科技大学建筑科学研究所开放基金资助项目(JYSJJ-2021Q03)。

摘　　要：针对微生物诱导碳酸钙沉淀(microbial induced calcite precipitation,MICP)技术在固化土体的过程中存在碳酸钙分布不均匀的问题,采用低pH一相注浆法对微生物固化土体试样过程中碳酸钙的分布情况开展试验研究。通过正交试验,确定最优培养方案为:pH=3.0、OD600=4.0、胶结液浓度cs=2.00 mol/L。基于最优注浆方案研究微生物固化土体试样中碳酸钙的分布情况和试样强度变化特性,并通过扫描电镜测试,观察固化试样的微观结构特征。结果表明:低pH一相注浆法有助于促进微生物反应过程中碳酸钙的均匀性分布,相较于两相注浆法,低pH一相注浆法固化试样的内摩擦角增大17.9%,黏聚力增大46.3%,压缩模量增大22.4%。In order to solve the problem of uneven distribution of calcium carbonate in the process of soil solidification by microbial induced calcite precipitation(MICP),low pH one-phase grouting method was used to study the distribution of calcium carbonate in soil samples solidified by microorganisms.The optimal culture conditions were determined as pH=3.0,OD600=4.0 and cs=2.00 mol/L by orthogonal test.Based on the optimal grouting scheme,the distribution of calcium carbonate and the strength of soil samples were studied,and the microstructure of soil samples was observed by SEM.The results indicated that the low pH single-phase grouting method helped promote the uniform distribution of calcium carbonate during microbial reaction processes.Compared to the two-phase grouting method,the low pH single-phase grouting method resulted in a 17.9%increase in the internal friction angle,a 46.3%increase in cohesion,and a 22.4%increase in compressive modulus of the solidified specimens.

关 键 词：微生物诱导碳酸钙沉淀 注浆方法 低PH 土工试验 微观结构 

分 类 号：TU144.3[建筑科学—建筑理论]