Project Description

The Broadway Subway Project consists of a proposed 5.7 km extension of the SkyTrain Millennium Line, a route beginning from the existing VCC-Clark Station in East Vancouver, and terminating at Broadway and Arbutus Streets in the city’s West Side.

Our Role

RAM has been been providing geotechnical services for the Broadway subway line. To date, our services have included the following:

Arbutus Station and Crossover

• Design of the temporary excavation shoring system for 380 metres-long excavations, with heights ranging from 10 to 18 metres. Various temporary shoring systems have been considered that that would suit the site conditions and restrictions within different areas. These systems include the design of soil anchors, pipe piles, secant piles, and struts;
• Design of support for two water mains with diameters of 1200 mm and 1800 mm;
• Design of traffic decks supports in order to allow for safe traffic flow on Broadway during construction of this station;
• Design of robust dewatering system during construction;
• Preparation of a Construction Risk and Impact Assessment Report (CRIAR) outlining any potential impacts of construction on the nearby existing buildings, utilities, and roads, as well as recommendations for instrumentation and monitoring that should be carried out during construction of this station.

Other Stations

• Design of temporary excavation shoring system for the Muck Pit area that would be used to temporarily store site excavated materials from the Tunnel Boring Machine (TBM);
• Engineering analysis and providing recommendations for bearing capacity, settlement, and subgrade preparation for the storage silos that would store materials, used during TBM operation and construction;
• Engineering analysis and providing subgrade preparation recommendations for the scaffolding that supports the elevated guideway during construction;
• Engineering analysis and providing subgrade preparation recommendations for the girder support;
• Engineering analysis and providing subgrade preparation recommendations for the girder installation crawler cranes;
• Preparation of dewatering design drawings and review construction for five other Skytrain stations;
• Field reviews during construction for subgrades of pad footings for temporary deck bridge for four stations.