Abstract
The artificial island of the western anchorage of Lingdingyang Bridge in Shenzhen-Zhongshan Link adopts a flexible geotextile cofferdam for temporary island construction, which is relatively rare in offshore land reclamation projects. Therefore, it is urgent to carry out on-site monitoring tests to analyze the stability of this approach. The artificial island employs waterborne cement mixing piles and geotextile to construct a cofferdam, the foundation is treated by preloading and plastic drainage plates, and the island foundation is treated with waterborne cement mixing piles for soft foundation. In the artificial island of the western anchorage, the on-site monitoring results of the sedimentation and deep horizontal displacement of the cofferdam in the foundation treatment area treated by plastic drainage plates show that after adopting the plastic drainage plates for foundation treatment, the sedimentation and sedimentation rate in this area significantly increase. The monitoring time is 265 d in total and the maximum sedimentation of the foundation during this period is 2194 mm. In the area treated by waterborne cement mixing piles where the maximum foundation sedimentation is about 195 mm, the sedimentation rate is significantly lower than that of the area treated by plastic drainage plates. The horizontal displacement of the deep cofferdam and the cumulative horizontal displacement of the original mud surface at the front end both remain stable. The cofferdam shifts outward in all directions, with maximum cumulative horizontal displacement of 330 mm. During the construction process, the artificial island of the western anchorage is basically in a stable state, indicating that the utilization of flexible geotextile cofferdams can help effectively carry out offshore artificial island filling and ensure the stability.
Publication Date
1-18-2024
DOI
10.14048/j.issn.1671-2579.2023.06.004
First Page
21
Last Page
26
Submission Date
March 2025
Recommended Citation
Yicheng, KUANG; Kaibo, YANG; Pingbao, YIN; and Jie, WANG
(2024)
"Cofferdam deformation monitoring and soft foundation treatment for hydraulic reclamation artificial island,"
Journal of China & Foreign Highway: Vol. 43:
Iss.
6, Article 114.
DOI: 10.14048/j.issn.1671-2579.2023.06.004
Available at:
https://zwgl1980.csust.edu.cn/journal/vol43/iss6/114
Reference
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