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Volume 41 Issue 4
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PENG Jie, WEN Zhi-li, LIU Zhi-ming, SUN Yi-cheng, FENG Qing-peng, HE Jia. Experimental research on MICP-treated organic clay[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(4): 733-740. DOI: 10.11779/CJGE201904017
Citation: PENG Jie, WEN Zhi-li, LIU Zhi-ming, SUN Yi-cheng, FENG Qing-peng, HE Jia. Experimental research on MICP-treated organic clay[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(4): 733-740. DOI: 10.11779/CJGE201904017
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Experimental research on MICP-treated organic clay

  • 1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China;
    2. Jiangsu Research Center for Geotechnical Engineering Technology, Hohai University, Nanjing 210098, China

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  • Received Date: March 19, 2018
  • Published Date: April 24, 2019
    Graphical Abstract
    • Abstract
  • A series of tests using ureolytic bacteria ATCC 11859 are conducted to reinforce the organic clay, with cementation reagent with different concentrations flowing to the soil under pressures. The reinforcement effect is comprehensively evaluated by comparing the changes of unconfined compressive strength, content of calcium carbonate, permeability, content of organic matter and concentration of ammonia and Ca2+ in the effluent. The results show that it is effective to treat the organic clay using pressure grouting. After treatment, the content of organic matter can be reduced by 1%~4%, the unconfined compression strength can increase by up to 370%, and the permeability coefficient can be reduced by about one order of magnitude. Under this bacteria condition (activity with 9.68 m M-urea hydrolysed•min-1 and concentration with about 108 cell/mL), the concentration of cementation reagent has a significant influence on the treatment effect. The unconfined compressive strength of the soil can be improved significantly by increasing the concentration of urea in 0.25 M-cementation reagent.
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    • References (30)
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