微生物诱导碳酸钙沉淀加固黄土影响因素试验研究  

Experimental Study on the Influencing Factors of Microbial-induced Calcium Carbonate Precipitation for Consolidation of Loess

作　　者：赵天宇 安亮 谌文武[2] 王迎春 李论基 ZHAO Tian-yu;AN Liang;CHEN Wen-wu;WANG Ying-chun;LI Lun-ji(Gansu Province Transportation Planning,Survey&Design Institute Co.,Ltd.,Lanzhou 730030,China;College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]甘肃省交通规划勘察设计院股份有限公司,兰州730030 [2]兰州大学资源与环境学院,兰州730000

出　　处：《科学技术与工程》2025年第4期1620-1627,共8页Science Technology and Engineering

基　　金：甘肃省科技揭榜挂帅项目(21ZD8JA003);甘肃省交通运输厅科技项目(2024-38)。

摘　　要：微生物诱导碳酸钙沉淀(microbial induced calcium carbonate precipitation, MICP)技术是新兴的岩土工程绿色加固技术,在黄土边坡加固方面具有良好的应用前景。MICP加固黄土受多种因素影响,除了外界环境、材料特性和加固方式等因素外,钙源、胶结液浓度、养护龄期和养护方式等对微生物加固黄土也起着决定性作用。以陇西地区黄土为研究对象,采用巴氏芽孢杆菌诱导碳酸钙沉淀技术固化黄土试样,开展不同钙源、胶结液浓度、养护龄期和养护方式条件下MICP固化黄土试样抗剪强度对比试验研究。结果表明:钙源为氯化钙,胶结液浓度1.0 mol/L且试样养护7 d条件下,MICP技术对黄土试样的加固效果更好,与素黄土相比,黏聚力和内摩擦角分别提高了4.95和1.34倍。研究成果对黄土高原地区的路基加固和边坡治理等具有一定的参考价值。Microbial induced calcium carbonate precipitation(MICP)technology is an emerging green reinforcement technology for geotechnical engineering,which has a good application prospect in the reinforcement of loess slopes.The reinforcement of loess by MICP is affected by a variety of factors,in addition to the external environment,material properties and reinforcement methods and other factors,the calcium source,the concentration of binder,the age of the maintenance and the maintenance methods also play a decisive role in the microbial reinforcement of loess.The loess in Longxi area was taken as the research object,bacillus subtilis-induced calcium carbonate precipitation technology was adopted to consolidate loess,and a comparative experimental study on the shear strength of MICP-consolidated loess under the conditions of different calcium sources,binder concentration,age of maintenance and maintenance methods was carried out.The results show that the MICP technology is more effective in consolidating loess specimens when the calcium source is calcium chloride,the binder concentration is 1.0 mol/L and the specimens are cured for 7 d.The cohesion and internal friction are increased by 4.95 and 1.34 times,respectively,compared with the vegetal loess soil.The research results have certain reference value for the roadbed reinforcement and slope management in the Loess Plateau area.

关 键 词：微生物诱导碳酸钙沉淀(MICP) 微生物 黄土加固 钙源 胶结液浓度 养护龄期 

分 类 号：TU433[建筑科学—岩土工程]