19th WORLD CONFERENCE OF THE ASSOCIATED RESEARCH CENTRES FOR THE URBAN UNDERGROUND SPACE, Belgrade, Serbia, November 4-7, 2025. (Paper No: 2.11.31, pp. 361-368)
AUTOR(I) / AUTHOR(S): Edward, Lim; Seng Hou, Lim; Hooi Leng, Phua; Teck Siew, Chin; Shi Hui, Tan
Download Full Pdf 
DOI: 10.46793/ACUUS2025.2.11.31
SAŽETAK / ABSTRACT:
The Thomson East-Coast Line Contract T202 Woodlands North Station was constructed beneath a secondary forest in hilly terrain. The 800-metre-long cut-and-cover underground structures comprise three main components: the northern overrun tunnel, the station structure, and southern crossover tunnels. The site’s geology features hard granite bedrock overlaid by undulating residual soil of highly weathered granite.
The selection of an appropriate earth retaining support system for deep excavation required careful consideration of multiple factors: site constraints, groundwater movement, economic viability, programme requirements, permanent structure configuration, and the availability and competency of domestic specialist contractors. The implementation complexity was further heightened by the varied ground conditions.
A hybrid system was adopted for the cut-and-cover construction, incorporating,Contiguous Bored Pile Walls, Soldier Pile-Timber lagging and open-cut excavation with perimeter soil drains.
The design complexity was further increased by the need to accommodate future integrated underground development adjacent to Woodlands North station, requiring specific temporary earth retaining systems to protect the constructed station from unbalanced movement during future excavation works.
This paper examines the considerations, experiences and challenges encountered throughout the design and construction phases of this hybrid earth retaining system.
KLJUČNE REČI / KEYWORDS:
Hybrid-Earth Retaining System, Contiguous Bored Pie Wall, Soldier pile-timber, open-cut excavation, highly weathered granite
PROJEKAT / ACKNOWLEDGEMENT:
LITERATURA / REFERENCES:
- K.H. Lim, I. Yogarajah, T.G. Ng., S.H. Lim, K. Uchida, “Design and Construction of a Three-Sided ERSS Wall for Launch Shaft, Underground Singapore 2018.