微生物诱导碳酸钙沉淀修复三合土裂缝效果研究

doi:10.13722/j.cnki.jrme.2019.0421

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Abstract Cracks as a damage type of earthen sites not only destroy tabia structure integrity but also degrade mechanical properties due to providing preferential paths for rainfall infiltration. Therefore，the repair of tabia cracks is an important part of protection and reinforcement of earthen sites. Due to that calcium carbonate is one of the main components of the tabia，the use of microbially induced carbonate precipitation(MICP) technical to repair and protect the tabia is not only environmentally friendly but also compatible with the substrate. In this paper，a crack repair method dominated by MICP was proposed to repair the cracks of the tabia，and the repair effect was evaluated by experimental test. First，the influencing factors of MICP test and the reinforced soil column test were carried out to determine the suitable parameters for repairing cracks，including the concentrations of bacteria and cementation reagent，filled soil particles and the number of grouting cycles. Then，the pre-damaged tabia samples were repaired using MICP with the suitable parameters，and the repair effect was verified. The results show that，when the crack width is 5 mm，the recovery ratios of the average flexural strength and shear strength of the specimens repaired by MICP are respectively 79.92% and 88.54%，showing a very satisfactory repairing ability，while that the recovery ratio tends to decrease as the crack width increases. In addition，the static contact angle test results show that the MICP not only repairs the crack but also enhances the hydrophobicity of the crack. MICP technology can be used as an effective method to repair cracks in the tabia.

Key words： soil mechanics microbially induced carbonate precipitation tabia crack repair grouting recovery ratio

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	Articles by authors
	LIU Shiyu1
	2
	YU Jin1
	ZENG Weilong1
	PENG Xingqian1
	3
	CAI Yanyan1
	TU Bingxiong1

Cite this article:

LIU Shiyu1,2,YU Jin1, et al.

Repair effect of tabia cracks with microbially induced carbonate precipitation

[J]. , 2020, 39(1): 191-204.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2019.0421 OR http://www.rockmech.org/EN/Y2020/V39/I1/191

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