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Abstract: The Singapore North-South Cable Tunnel contract NS2 is approximately 5.5km long located between Ang Mo Kio and Mandai and is in close proximity to two man-made reservoirs with an elevated water table. Tunnel excavation was split into two drives, using slurry Tunnel Boring Machines (TBM), excavating through the Bukit Timah Granite rock containing fractures and major fault zones. It also passes...