Dredged Clay Treatment Consolidation Theory by Air-Booster Vacuum Preloading

Air-booster vacuum preloading (AVP) without sand blanket and surcharge vacuum preloading (SVP) methods were used to treat two adjacent areas in a foundation reinforcement project on Donghai Island, Zhanjiang City, Guangdong Province, China. In this study, engineering characteristics of the AVP found...

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Bibliographic Details
Published in:Journal of geotechnical and geoenvironmental engineering 2024-05, Vol.150 (5)
Main Authors: Liu, Jingjin, Luo, Xuesi, Lei, Huayang, Zheng, Gang, Luo, Haopeng, Jin, Yawei
Format: Article
Language:English
Subjects:
Air
Compression
Compression index
Consolidation
Dredging
Exact solutions
Mathematical models
Permeability
Vacuum
Vertical drains
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Summary:Air-booster vacuum preloading (AVP) without sand blanket and surcharge vacuum preloading (SVP) methods were used to treat two adjacent areas in a foundation reinforcement project on Donghai Island, Zhanjiang City, Guangdong Province, China. In this study, engineering characteristics of the AVP foundation were obtained through analyzing monitoring data. Results showed that the AVP method obtained superior foundation consolidation results compared to SVP method. This study proposed a new simplified mechanical model for AVP, with a single PVD (prefabricated vertical drain) centered and the air-booster pipes symmetrically distributed around the PVD, applied equivalent air-booster pressure to the drainage boundary. Furthermore, this study established a mathematical analytical model for predicting consolidation settlement based on the proposed simplified model. By comparing the theoretical settlement value with the measured value, this paper verifies the rationality of the analytical solution. Finally, this study analyzed the effects of well resistance, smearing effect, compression index, and permeability index ratio on consolidation characteristics.
ISSN:1090-0241
1943-5606
DOI:10.1061/JGGEFK.GTENG-11918