Projects

DC Water - Northeast Boundary Tunnel

Maxwell GeoSystems provides high level data management for several key aspects to DC Water's largest component of the Clean Rivers Project in Washington DC, USA.

Image Courtesy of TunnelingOnline.com

Image Courtesy of TunnelingOnline.com

The NEBT is the largest component of the Clean Rivers Project in Washington DC (USA) and will be built using the TBM “Chris” (92m in length).

The tunnel project faces a number of challenges including heavy clay and water bearing clayey sands at water pressures up to 3bar, a challenging alignment with 15 curves, and a complex work environment for shaft construction with small shaft sites combined with urban residential neighbourhoods and a high traffic corridor.

Parties afiliated with the Project: Designer: Brierley Associates; TBM Supplier: Herrenknecht; Slurry Walls, Jet Grout, Secant Piles, Solider Piles: Treviicos; Segmental Tunnel Liner Supplier: ConSeg JV; Muck Hauling: Bulldog; Construction; Instrumentation: Entech; Traffic Engineering & Instrumentation Installation: EBA; Construction Manager: EPC Consultants; DC Clean Rivers Program Manager: McMillan Jacobs and Greeley & Hansen.

The Northeast Boundary Tunnel (NEBT) is a reinforced concrete sewer tunnel (7m diameter, 15-48m deep), that will increase the capacity of the existing sewer system in Washington DC’s North East District.

Maxwell GeoSystems is providing its industry leading MisssionOS cloud-data platform, to meet the client’s needs for real-time feedback of ground deformation in conjunction with shaft construction & key TBM operation parameters.

Due to the sensitivity of surrounding infrastructure, the client relies on MissionOS ’s real-time alarm notification system to alert key parties of potential unwanted settlements.

Addtional key features implemented on this job include proximity functions to relate ground deformation to TBM operations, prediction models to estimate final settlement, and TBM parameter alarms.

Sector
Tunnels
Location
Washington, DC USA
Client
DC Water
Budget
USD$580 Million
Technical
Summary
Instruments
TBM Drives
Shafts
Instrument Records
Users
Status
408~ Installed & Operating
1
7
10,000 per day
69
Ongoing (Tunnelling started)
463 TBM Sensors    13 Types