Experimental study on electricity resistivity of MICP-treated calcareous sand foundation

SHI Jinquan; WANG Lei; ZHANG Xuanming; ZHAO Hang; WU Bingyang; ZHAO Hanghang; LIU Hanlong; XIAO Yang

doi:10.11779/CJGE20221281

Volume 46 Issue 2

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Chinese Journal of Geotechnical Engineering > 2024 > 46(2): 244-253. > DOI: 10.11779/CJGE20221281

SHI Jinquan, WANG Lei, ZHANG Xuanming, ZHAO Hang, WU Bingyang, ZHAO Hanghang, LIU Hanlong, XIAO Yang. Experimental study on electricity resistivity of MICP-treated calcareous sand foundation[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(2): 244-253. DOI: 10.11779/CJGE20221281

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Experimental study on electricity resistivity of MICP-treated calcareous sand foundation

SHI Jinquan^{1, 2, 3,},
WANG Lei^{1, 4},
ZHANG Xuanming¹,
ZHAO Hang¹,
WU Bingyang¹,
ZHAO Hanghang¹,
LIU Hanlong^{1, 2, 3},
XIAO Yang^{1, 2, 3, ,}

1.
School of Civil Engineering, Chongqing University, Chongqing 400045, China
2.
Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing 400045, China
3.
National Joint Engineering Research Center of Geohazards Prevention in the Reservoir Areas (Chongqing), Chongqing 400045, China
4.
Audit Office of Quanzhou, Quanzhou 362000, China

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Received Date: October 16, 2022
Available Online: June 05, 2023

Graphical Abstract

Abstract

Abstract

The heterogeneity is a technical problem for MICP-reinforced foundation. The electricity resistivity of a MICP-treated calcareous sand foundation is experimentally studied using the selft-developed multichannel measurement equipments. The effects of bacterial solution and cementation solution on the amplitude and variation law of electricity resistivity are investigated. The spatial differences of the MICP treatment effects in the calcareous foundation and the feasibility of using the electricity resistivity to monitor the MICP reaction process are discussed. The test results show that the electricity resistivity of the calcareous foundation is affected by the density, bacterial solution and cementation solution, among which the effects of cementation solution are the most significant. The electricity resistivity firstly increases, then decreases with the increase of MICP treatment times. The deeper soil has lower electricity resistivity than the upper soil. The electricity resistivity increases after the seventh or the eighth treatment. The reason for this phenomenon may be that the pores in the soil are gradually filled by the generated calcium carbonate after the repeated reinforcement, and the ion exchange channels in the soil are reduced, leading to an increase in the resistivity. The influences of calcium carbonate-filled pores on the resistivity are dominant at this time.
- MICP,
- electricity resistivity,
- calcareous sand,
- bacterial solution,
- cementation solution

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References (29)

References

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