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A platform for research: civil engineering, architecture and urbanism
Challenges of Earthen Cofferdam in Deep Excavations for Waterfront Structures, a Case Study
This paper is a case study of an earthen cofferdam, constructed for a deep excavation at intake location in River Aaundha, Maharashtra, India. A 12 m (39 ft) deep excavation was made to construct the intake well. The natural soil profile at this location is clay followed by rock. An earthen Cofferdam of a maximum height of 7 m (23 ft) was made around the periphery of the excavation. Cofferdam embankment and excavation slopes were analysed using the finite element software PLAXIS-2D. Clayey sand was proposed as a filling material during design, but clayey soil was used for the embankment formation during execution. The embankment was built up to 5 m in height in July 2017 and completely submerged due to monsoon. In February 2018, the embankment height was raised to 7 m (23 ft) by filling the soil over the existing submerged embankment. After a few days of completion of the Cofferdam, the inside slope of the embankment had started sliding due to continuous dewatering. The design and execution of deep excavation with earthen Cofferdam for waterfront structures are challenging. The selection of filling material for embankment formation and dewatering techniques plays a vital role in the safety and stability of the embankments. Although all the safety measures were taken during the design, execution challenges are unpredictable.
Challenges of Earthen Cofferdam in Deep Excavations for Waterfront Structures, a Case Study
This paper is a case study of an earthen cofferdam, constructed for a deep excavation at intake location in River Aaundha, Maharashtra, India. A 12 m (39 ft) deep excavation was made to construct the intake well. The natural soil profile at this location is clay followed by rock. An earthen Cofferdam of a maximum height of 7 m (23 ft) was made around the periphery of the excavation. Cofferdam embankment and excavation slopes were analysed using the finite element software PLAXIS-2D. Clayey sand was proposed as a filling material during design, but clayey soil was used for the embankment formation during execution. The embankment was built up to 5 m in height in July 2017 and completely submerged due to monsoon. In February 2018, the embankment height was raised to 7 m (23 ft) by filling the soil over the existing submerged embankment. After a few days of completion of the Cofferdam, the inside slope of the embankment had started sliding due to continuous dewatering. The design and execution of deep excavation with earthen Cofferdam for waterfront structures are challenging. The selection of filling material for embankment formation and dewatering techniques plays a vital role in the safety and stability of the embankments. Although all the safety measures were taken during the design, execution challenges are unpredictable.
Challenges of Earthen Cofferdam in Deep Excavations for Waterfront Structures, a Case Study
Lecture Notes in Civil Engineering
Adimoolam, Boominathan (editor) / I. V., Anirudhan (editor) / Basarkar, Sunil S. (editor) / Prashant, Amit (editor) / Ramana, P. V. (author) / Balasubramani, M. (author) / Bairagi, K. (author)
DFI-India Annual Conference ; 2021
2023-04-11
10 pages
Article/Chapter (Book)
Electronic Resource
English
Earthen Materials and Earthen Structures
| Springer Verlag | 2022
TEMPORARY COFFERDAM METHOD, TEMPORARY COFFERDAM STRUCTURE
| European Patent Office | 2022