Effect of tamping interval on consolidation of dredged slurry using vacuum preloading combined with dynamic consolidatio
- PDF / 2,152,547 Bytes
- 13 Pages / 595.276 x 790.866 pts Page_size
- 63 Downloads / 168 Views
(0123456789().,-volV)(0123456789(). ,- volV)
RESEARCH PAPER
Effect of tamping interval on consolidation of dredged slurry using vacuum preloading combined with dynamic consolidation You Zhou1 • Yuanqiang Cai2,3 • Guohui Yuan1 • Jun Wang1 Xueyu Geng4 • Mingfeng Li5 • Jingyun Liu1 • Haisheng Jin6
•
Hongtao Fu1 • Xiuqing Hu1
•
Received: 4 March 2020 / Accepted: 12 September 2020 Ó Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The effect of combining vacuum preloading and low-energy dynamic consolidation is predominantly controlled by the tamping interval time. It is, therefore, imperative to identify a suitable parameter and optimise the tamping interval time. In this study, the effect of the tamping interval time on the consolidation of slurries was investigated by conducting laboratory model tests. Consequently, various tamping interval times were obtained by controlling the dissipation of pore water pressure at different levels of 20%, 40%, 60%, 80%, and 100% to determine the optimal interval time. In terms of surface settlement variation, dissipation of pore water pressure, and distributions of the water content and shear strength variation profile, it was shown that a rubber soil state was reached at a dissipation rate of 20% pore water pressure. When the tamping interval time was set to a dissipation rate of 80% pore water pressure, the consolidation effect was optimal. Keywords Dredged slurry Low-energy dynamic consolidation Model tests Tamping interval time Vacuum preloading
1 Introduction In China, many land reclamation projects have been recently conducted using slurry dredged from the seabed of nearby areas. The dredged slurry deposits exhibit an extremely low bearing pressure capacity and excessive settlement characteristics [3, 15, 16, 21, 35, 39, 40]. Consequently, it is vital to apply a ground reinforcement & Jun Wang [email protected] 1
College of Civil Engineering and Architecture, Wenzhou University, Chashan University Town, Wenzhou 325035, China
2
Innovation Center of Tideland Reclamation and Ecological Protection, Wenzhou University, Wenzhou, China
3
College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, China
4
School of Engineering, University of Warwick, Coventry CV4 7AL, UK
5
Ruian Economic Development Zone Development Co., Wenzhou Zhejiang, China
6
Wenzhou Oufei Economic Development and Investment Co., Ltd, Wenzhou, Zhejiang, China
technique on the slurry before structures are erected on it to prevent unacceptable differential settlement of the structures. Vacuum preloading, which has been well developed through intensive in-depth research [2, 11, 14, 17, 30–33, 37], is an extremely feasible slurry improvement technique. Vacuum pressure is distributed through the prefabricated vertical drains (PVDs) that are used to apply vacuum loading [5, 7, 8, 10, 12, 26]. However, PVDs are subject to clogging, which reduces the treatment effect in a later stage of vacuum preloading. As vacuum consolidation pro
Data Loading...
