Ground Stabilization | Geotechnical Construction
Brushy Creek Interceptor
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Project Description
The Brushy Creek Tunnel is a 3,000-foot long, 9.8-foot diameter sewer tunnel built in Round Rock, Texas for the Lower Colorado River Authority (LCRA). The population of surrounding areas expects to see continued growth in coming years, and the wastewater project will help to accommodate this growth. The Tunnel was built by KM&M Joint Venture utilizing Tunnel Boring Machine (TBM) methods. LCRA specified ground modification along the river crossings prior to mining with the TBM.
Team Members
Lower Colorado River Authority, KM&M Joint Venture, Crux Subsurface Inc.
Crux’s Role
Crux provided drilling and grouting services to the contractor, introducing a new method of tunnel stabilization called “Pre-Tunnel Excavation Exploration and Stabilization.” This method involves the stabilization of a tunnel alignment prior to excavation with a TBM.
Crux drilled continuous, long-range, horizontal boreholes from an intermediate shaft using a wire line coring system. This was done in lieu of completing radial probe borings from the TBM. Crux’s specialty drilling techniques enabled little to no deviation of the drill string. In combination with downhole surveys, this allowed for continuous core while maintaining a set elevation and target zone. Once drilling was completed, Crux performed water pressure tests and permeation grouting in the borings. After grouting, the TBM completed the river crossing with nearly zero water infiltration.
The drill was placed in a 50-foot deep, 14-foot diameter shaft using a boom truck. Crew access was by man basket.
To request additional information, please use our Contact Page or call 866-CRUXSUB (866-278-9782).
