Effects of pressurizing timing on air booster vacuum consolidation of dredged slurry |
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| Affiliation: | 1. Emeritus Professor and Project Consultant, Asian Institute of Technology, Bangkok, Thailand;2. Soil Engineering Research Center Director, Department of Civil Engineering, King Mongkut''s University of Technology North Bangkok, Bangkok, Thailand;3. Construction Innovations and Future Infrastructures Research Center, Department of Civil Engineering, Faculty of Engineering, King Mongkut''s University of Technology Thonburi, Bangkok 10140, Thailand;4. Centre of Excellence in Geotechnical and Geoenvironmental Engineering, Department of Civil Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330, Thailand;5. Thai Obayashi Co. Ltd., Bangkok, Thailand;6. Ceteau (Thailand) Co. Ltd., Bangkok, Thailand;7. Ground Improvement Designer, Ceteau BV, Makkum, the Netherlands;1. College of Architecture and Civil Engineering, Wenzhou University, Chashan University Town, Wenzhou, 325035, China;2. Key Laboratory of Engineering and Technology for Soft Soil Foundation and Tideland Reclamation, Wenzhou University, Zhejiang, Wenzhou, China;3. Innovation Center of Tideland Reclamation and Ecological Protection, Wenzhou University, Wenzhou, China;4. College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou, 310014, China;5. Key Laboratory of Soft Soils and Geoenvironmental Engineering, Ministry of Education, Zhejiang University, Hangzhou, China;6. School of Engineering, University of Warwick, Coventry, CV4 7AL, United Kingdom;7. Architectural, Surveying & Mapping Engineering, Jiangxi University of Science and Technology, No. 99, Hongqi Road, Ganzhou, China;1. Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Macau, China;2. UMacau Research Institute, Zhuhai, Guangdong, China;3. Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, College of Civil Engineering and Architecture, Guangxi University, Nanning, China |
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| Abstract: | Air booster vacuum preloading is a newly improved method applied in land reclamation projects. Highly pressurized air can provide an additional pressure difference between the prefabricated vertical drain (PVD) and injection point, thereby increasing the hydraulic gradient and generating small fractures that can improve the soil permeability and the transmission efficiency of the vacuum pressure. However, with a premature activation time, the pressurized air can create air channels connected to the PVD, which may drastically decrease the vacuum pressure. With a delayed activation time, the strength of the dredged clay may be too high to permit fractures, thus limiting the permeability improvement. In this study, soils with degrees of consolidation (DOCs) of 0%, 40%, 60%, and 80% were selected for testing the efficacy of initial booster activation times in four tests. The results show that the pressurizing groups were more effective in improving the consolidation of soils, and the best effect of the use of air booster is obtained when soil has been consolidated to a DOC of 60%. The lower soils of the pressurized groups showed greater increase rates than those demonstrated by conventional vacuum preloading. |
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| Keywords: | Geosynthetics Vacuum preloading Dredged slurry Air booster Pressurizing timing Prefabricated vertical drain |
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