Experimental research on MICP-treated organic clay

被引：0
|
作者：
Peng J. [1 ,2 ]
Wen Z.-L. [1 ,2 ]
Liu Z.-M. [1 ,2 ]
Sun Y.-C. [1 ,2 ]
Feng Q.-P. [1 ,2 ]
He J. [1 ,2 ]
机构：
[1] Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing
[2] Jiangsu Research Center for Geotechnical Engineering Technology, Hohai University, Nanjing
来源：
Yantu Gongcheng Xuebao/Chinese Journal of Geotechnical Engineering | 2019年 / 41卷 / 04期
关键词：
Concentration of cementation reagent; MICP; Organic clay; Pressure grouting;
D O I：
10.11779/CJGE201904017
中图分类号：
学科分类号：
摘要：
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. © 2019, Editorial Office of Chinese Journal of Geotechnical Engineering. All right reserved.
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页码：733 / 740
页数：7
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