Owner
Washington Metropolitan Area Transit Authority [WMATA]
Client
Kiewit Infrastructure West
Cost
$200 - $250 million USD
Timeframe
September 2021
— December 2023
Services performed
Review of contract documents and rehabilitation designs, provide value engineering proposals and inspection services.
Description
WMATA’s L-Line includes sections of fabricated steel tunnel liners located in twin separate circular tunnels totalling approximately 3,050 ft in length, located between the Pentagon and L’Enfant Plaza Metro. The work included rehabilitating the steel-lined structure to provide redundant structural support of the existing tunnel, thereby restoring the structural integrity of the tunnel and extending its useful life for a minimum of fifty additional years.
Geology
Predominately clayey sand & sandy clay, overlain by sand & gravel. Groundwater table approximately 30 ft above tunnel crown.
Location
Washington, DC, USA
Highlights
- Value Engineering of rehabilitation designs.
- Inspection and assessment of fabricated steel tunnel liners.
- Assessment of feasible grouting procedures.
Shaft/Tunnel Interface
Fabricated Steel Tunnel Liner