Effect of the pressurized duration on improving dredged slurry with air booster vacuum preloading. Issue 8 (13th September 2020)

• Record Type: Journal Article
• Authors: Ke, Shanwei; Wang, Peng; Hu, Xiuqing; Geng, Xueyue; Hai, Jun; Jin, Jinqiang; Jiang, Ziwu; Ye, Qiang; Chen, Zhijian
• Is Part Of: Marine georesources & geotechnology. Volume 38:Issue 8(2020)
• Page Start: 970
• Page End: 979
• Publication Date: 2020-09-13
• Subjects: Air booster -- pressurized duration -- vacuum preloading -- dredged slurry -- consolidation; Marine mineral resources -- Periodicals; 551.46
• DOI: 10.1080/1064119X.2019.1645250
• Languages: English
• ISSNs: 1064-119X

Abstract

Abstract: Compared with traditional vacuum preloading, air booster vacuum preloading is more effective at strengthening dredged slurry and improving the consolidation process. Although many engineering practices have shown that the pressurized duration has a significant effect on the reinforcement effect, there is no standard available for determining the pressurized duration. In this study, five dredged slurry samples were tested to examine the effect of different pressurized durations on the consolidation. An extensive monitoring system was used to measure the vacuum pressure, pore water pressure, settlement, and water discharge during the test, while the water content and shear strength were measured after the test. The collected monitoring data were comprehensively analyzed to evaluate the reinforcement effect. The results revealed that the pressurization system can be used to reinforce deep dredged slurry and make the whole soil layer more homogeneous. If the pressurized duration is too short, the dissipation of pore water pressure is too little to achieve the pressurization effect. If the pressurized duration is too long, too much gas will be in the soil and enter the vacuum system, which will significantly reduce the vacuum pressure and thus the reinforcement effect. Based on these findings, the optimal pressurized duration was obtained.