Contract 904 was a civil engineering project that is part of the South Island Line in Hong Kong.

In December 2016, MTR Corporation’s South Island Line (East) (SIL(E)) project in Hong Kong completed construction and began operations, giving the people of Hong Kong a public transport option from the Southern District of Hong Kong to the existing MTR network at Admiralty Station. The expectation is this new line will transport approximately 170,000 passengers per day.

Contract 904 involved the construction of tunnels and underground stations located on Ap Lei Chau. The tunnels measured approximately 1.2 km from the connection with the bridge over Aberdeen Channel, to South Horizons Station. The tunnel spans varied from 7 m to 17 m, and a station cavern at Lei Tung was constructed 25 m wide by 22 m high at its largest section.

The section of tunnels was constructed by a combination of drill and blast, mechanical excavation, and cut and cover tunnelling techniques. Apart from the main line tunnels, Contract 904 also included Lei Tung and South Horizons Stations, ancillary buildings, and many access and ventilation adits.

Aurecon acted as the contractor’s designer, performing a review of geotechnical, temporary rock support design for cavern, mainline tunnels and station entrance adits. The design of temporary rock support for the mixed ground tunnels accommodated a station span approaching 25 m. Optimisation of the permanent lining design was also a key requirement.

Aurecon developed the blasting assessment reports, through governmental department approval processes, and predicted grouting quantities and volumes in the design for project planning purposes.

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