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DART Segment NC1 - A1/A2

NATM alternative design, FEM design computations for NATM and TBM driven tunnels, ground classification and ground stabilization measures
Estimated cost: Commencement:
December 28, 1989
Completion date:
December 28, 1994
Dallas, TX
United States
Technical data:

4 single-track light rail tunnels, total length 11,500 ft (3505 m).

Geology description:

Shale, clay, terrace sands and gravels (below groundwater level). Weathered and unweathered Limestone (Austin Chalk).

Geology types:
Bid cost: Final cost:
Service areas:
Escalator Shaft
Twin Portal
Assembly of Robbins TBM
TBM before Start of Excavation
TBM Breakthrough
Shotcrete Application
Finished Tunnel
Shotcreting robot
TBM assembled
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