三合土表面微生物诱导碳酸钙沉淀耐水性试验研究

doi:10.13722/j.cnki.jrme.2018.0734

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Abstract Water is one of the most important factors causing surface erosion of earthen sites. In this study，microbially induced carbonate precipitation(MICP) technique was used to form a water-resistant layer on the surface of tabia，and the applicability of MICP for tabia surface erosion control was examined by the static contact angle test，capillary water absorption test，Karsten tube test，durability test，acid resistance test，water vapor permeability test and surface color change test in the laboratory. The effect of the concentration of bacteria and cementation solution on the surface erosion control was analyzed. The test results show that MICP can significantly improve the water resistance of soil samples by changing the microstructure of the surface. A higher concentration of bacteria and cementation solution can make the sediment layer play a better protection in a non-linear form. There is a suitable concentration value of the bacterial solution. When the bacterial concentration is less than the value，the change of the concentration has a great influence on the water resistance of the treated samples. However，the change of the bacterial concentration greater than the value has no obvious effect. The discovery of suitable concentration value can improve the economics of MICP technology on the premise of successful application of MICP in practice. The MICP protection layer not only has good durability，but also has little negative impact on the air permeability and color of the samples. MICP can be used as an effective method to relieve surface erosion of earthen sites.

Key words： soil mechanics earthen sites surface erosion microorganism calcium carbonate protective layer water resistance

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	Articles by authors
	LIU Shiyu1
	2
	YU Jin1
	2
	HAN Liang1
	2
	CAI Yanyan1
	2
	TU Bingxiong1
	2
	ZHOU Jianfeng1
	2

Cite this article:

LIU Shiyu1,2,YU Jin1, et al. Experimental study on water resistance of tabia surface with microbially induced carbonate precipitation[J]. , 2019, 38(8): 1718-1728.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.0734 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/I8/1718

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