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Chinatown Station

Owner:
Client:
Service:
Conceptual, preliminary and detailed design of underground caverns, egress tunnels and mined shafts; scheduling and cost estimating; risk management; specifications and tender. Also onsite support during construction.
Estimated cost:
$1,600,000,000
Commencement:
March 01, 2016
Completion date:
Ongoing
Location:
425 Market Street Suite 1700
San Francisco, CA 94105
United States
Technical data:
Geology description:

The geology ranges from soft clay (Bay Clay) to stiff sands (Colma Sands) and competent to highly fractured rock (Franciscan Formation). The groundwater table is generally above the cavern springline.

Geology types:
Activity:
Categories:
Bid cost: Final cost:
$1.6 billion USD
Service areas:
Construction methods:
Tunneling under:
Groundwater control:
Tunnel length:
2.7km
Description

Chinatown Station is the Northern Terminus of the Third Street Light Rail Project, which is located in a dense urban neighbourhood, underneath a busy street and directly adjacent to numerous old buildings, as well as one high-rise building. The station encompasses a Cut-and-Cover headhouse for passenger entry, three large station caverns and an emergency egress shaft. In order to minimise excavation volume and optimise cost and schedule, the ventilation ducts are located below the platform level, and routed into the headhouse.

Excavation and support sequence of large urban cavern
Large urban cavern under construction
Excavation and support sequence - longitudinal section
Chinatown, San Francisco Dense Urban Neighborhood
Overall Station Layout, Headhouse and Caverns (Rendering by JV)
Station Cavern with Center Platform, Mezzanine and Ventilation Ducts
Proposed Mitigation Measures for adjacent Buildings
Complex 3D Finite Element Analyses