Three tunnel sections, three different methods
The 3.6 kilometre-long Kwai Tsing Tunnels, over three individual sections, were part of the West Rail project. Each of the sections presented engineers with varying tunnelling conditions. As such, Dragages opted for different construction methods: drill-and-blast, Tunnel Boring Machine (TBM) and cut-and-cover.
The second section ran below a MTR line and highway roundabout. To cater for the mixed ground conditions, Dragages brought a dual mode Earth Pressure Balanced TBM, for the first time, to Hong Kong. Unlike traditional TBMs, the machine is capable of excavating both soft ground and rock.
Attaining the highest civil engineering and environmental standards, the tunnel was completed on time without causing disturbances or major disruptions to residents or road traffic.