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enzyme-induced carbonate precipitation for the Protection of Earthen Dikes and Embankments Under Surface Runoff: Laboratory Investigations

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Journal of Ocean University of China 2022年第2期21卷 306-314页

作者： HE Jia FANG Changhang MAO Xunyu QI Yongshuai ZHOU Yundong KOU Hailei XIAO Liang Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai UniversityNanjing 210098China College of Engineering Ocean University of ChinaQingdao 266100China Department of Finance and Audit Army Logistics UniversityChongqing 401331China

Earthen structures such as shore protection dikes and river embankments easily suffer from erosion under surface water *** study made experimental efforts to explore the enzyme-induced carbonate precipitation(EICP)method for slope erosion control under surface runoff for earthen *** sandy soils were treated by the EICP method for various *** characteristics were evaluated by the surface penetration resistance,calcium carbonate content,and surface hard crust thickness of EICP-treated *** runoff erosion experiments were carried out to evaluate the erosion control performances of the EICP *** surface penetration resistance,calcium carbonate content,and surface hard crust thickness were found to significantly increase with the treatment *** the erosion experiments,it was observed that the level of damages decreased and the water flow volume required to trigger the damage increased with more *** increase in the soil slope angle led to more serious surface *** amount and rate that the soil particles were eroded from the slope surfaces declined with more EICP treatments,which was consistent with those of visual *** preliminary investigations presented in this study have shown the potential of the EICP method for slope erosion control under surface runoff for earthen structures.

关键词： enzyme-induced carbonate precipitation urease erosion soil slope

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Field implementation of enzyme-induced carbonate precipitation technology for reinforcing a bedding layer beneath an underground cable duct

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第4期15卷 1011-1022页

作者： Kai Xu Ming Huang Jiajie Zhen Chaoshui Xu Mingjuan Cui College of Civil Engineering Fuzhou UniversityFuzhou350108China School of Civil Environment and Mining EngineeringUniversity of AdelaideAdelaide5005Australia

A suitable bearing capacity of foundation is critical for the safety of civil *** foundation reinforcement is necessary and an effective and environmentally friendly method would be the preferred *** this study,the potential application of enzyme-induced carbonate precipitation(EICP)was investigated for reinforcing a 0.6 m bedding layer on top of clay to improve the bearing capacity of the foundation underneath an underground cable *** experiments were conducted to determine the optimal operational parameters for the extraction of crude urease liquid and optimal grain size range of sea sands to be used to construct the bedding *** tests were planned based on orthogonal experimental design to study the factors that would significantly affect the biocementation effect on *** dynamic deformation modulus,calcium carbonate content and longterm ground stress variations were used to evaluate the bio-cementation effect and the long-term performance of the EICP-treated bedding *** laboratory test results showed that the optimal duration for the extraction of crude urease liquid is 1 h and the optimal usage of soybean husk powder in urease extraction solution is 100 g/*** calcium carbonate production rate decreases significantly when the concentration of cementation solution exceeds 0.5 mol/*** results of site trial showed that the number of EICP treatments has the most significant impact on the effectiveness of EICP treatment and the highest dynamic deformation modulus(Evd)of EICP-treated bedding layer reached 50.55 *** area with better bio-cementation effect was found to take higher ground stress which validates that the EICP treatment could improve the bearing capacity of foundation by reinforcing the bedding *** field trial described and the analysis introduced in this paper can provide a practical basis for applying EICP technology to the reinforcement of bedding layer in poor ground conditions.

关键词： enzyme-induced carbonate precipitation (EICP) Plant-based urease Underground cable duct Foundation reinforcement

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Unconfined compressive strength of MICP and EICP treated sands subjected to cycles of wetting-drying,freezing-thawing and elevated temperature:Experimental and EPR modelling

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第5期15卷 1226-1247页

作者： Isaac Ahenkorah Mizanur Rahman Rajibul Karim Simon Beecham WSP Golder WA6003Australia UniSA STEM University of South AustraliaMawson LakesSA5095Australia

Microbial-induced carbonate precipitation(MICP)and enzyme-induced carbonate precipitation(EICP)are two bio-cementation techniques,which are relatively new methods of ground *** both techniques share some similarities,they can exhibit different overall behaviours due to the differences in urease enzyme sources and treatment *** paper presented 40 unconfined compressive strength(UCS)tests of MICP and EICP treated sand specimens with similar average calcium carbonate(CaCO3)content subjected to cycles of wetting-drying(WD),freezing-thawing(FT)and elevated temperature(fire resistance test e FR and thermogravimetric analysis e TG).The average CaCO3 content after a certain number of WD or FT cycles(ACn)and their corresponding UCS(qn)reduced while the mass loss *** EICP treated sand specimens appeared to exhibit a lower resistance to WD and FT cycles than MICP treated specimens possibly due to the presence of unbonded or loosely bonded CaCO3 within the soil matrix,which was subsequently removed during the wetting(during WD)or thawing(during FT)*** test and TG analysis showed a significant loss of mass and reduction in CaCO3 content with increased temperatures,possibly due to the thermal decomposition of CaCO3.A complete deterioration of the MICP and EICP treated sand specimens was observed for temperatures above 600*** observed behaviours are complex and theoretical understanding is far behind to develop a constitutive model to predict ***,a multi-objective evolutionary genetic algorithm(GA)that deals with pseudo-polynomial structures,known as evolutionary polynomial regression(EPR),was used to seek three choices from millions of polynomial *** best EPR model produced an excellent prediction of qn with a minimum sum of squares error(SSE)of 2.392,mean squared error(MSE)of 0.075,root mean square error(RMSE)of 0.273 and a maximum coefficient of determination of 0.939.

关键词： Bio-cementation enzyme-induced carbonate precipitation (EICP) Microbial-induced carbonate precipitation (MICP) Calcium carbonate Urease enzyme

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