微生物诱导碳酸钙沉淀加固黄土影响因素试验研究
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1.甘肃省交通规划勘察设计院股份有限公司;2.兰州大学资源与环境学院;3.1

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TU433

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甘肃省科技揭榜挂帅项目“甘肃省黄河流域公路低环境影响建设关键技术研究”(No.21ZD8JA003)第一作者:赵天宇(1985-),男,汉族,甘肃庆阳人,博士,正高级工程师,注册岩土工程师,研究方向:岩土工程勘察与特殊性岩土测试研究。E-mail:zhaoty03@163.com。通讯作者:安亮(1993-),男,汉族,甘肃定西人,工程师,在读博士,研究方向:岩土工程勘察与特殊性岩土测试研究。E-mail:1596955860@qq.com。 ,王迎春1,李论基1,2,席银霞1,刘万明1


Experimental study on the influencing factors of microbial-induced calcium carbonate precipitation for consolidation of loess
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1.Gansu Province Transportation Planning,Survey Design Institute Co Ltd;2.College of Earth and Environmental Sciences, Lanzhou University;3.1

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    摘要:

    微生物诱导碳酸钙沉淀(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。本文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,开展了不同钙源、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,胶结液浓度为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,粘聚力和内摩擦角分别提高了4.95和1.34倍。研究结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。

    Abstract:

    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. This paper takes loess in Longxi area as the research object, adopts Bacillus subtilis-induced calcium carbonate precipitation technology to consolidate loess, and carries out 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. 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 were increased by 4.95 and 1.34 times, respectively, compared with the vegetal loess soil. The results are useful for the consolidation of loess in the Loess Plateau region. The results of the study have certain reference value for the roadbed reinforcement and slope management in the Loess Plateau area.

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赵天宇,安亮,谌文武,等. 微生物诱导碳酸钙沉淀加固黄土影响因素试验研究[J]. 科学技术与工程, , ():

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  • 收稿日期:2024-03-11
  • 最后修改日期:2024-05-29
  • 录用日期:2024-06-05
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