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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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