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Compensation Grouting Program to Mitigate Settlement of Utilities from Tunneling
Construction of the Anacostia River Tunnel in Washington, DC required the tunnel boring machine to pass beneath several utilities that were sensitive to movement as well as critical to the regional infrastructure. The utilities included a 1.2-m (48-in.) diameter water line, a 2.7-m (108-in.) diameter force main, a 0.8-m (30-in.) diameter water line and a 1.1-m (42-in.) diameter water line, all with varying degrees of redundancy. A compensation grouting program was designed, tested and implemented to reduce the risk of settlement of these utilities during tunneling. Challenges with this scope of work included site locations with access constraints, complex subsurface conditions, and very sensitive utilities with varying foundation systems. Compensation grouting parameters were established through an effective trial program and the grouting was then implemented in conjunction with an extensive monitoring program. Potential settlements of the utilities during tunneling of up to 13 mm (0.5 in.) were successfully mitigated by the compensation grouting program. This paper will discuss details of the trial and production grouting programs implemented during this critical portion of the Anacostia River Tunnel construction.
Compensation Grouting Program to Mitigate Settlement of Utilities from Tunneling
Construction of the Anacostia River Tunnel in Washington, DC required the tunnel boring machine to pass beneath several utilities that were sensitive to movement as well as critical to the regional infrastructure. The utilities included a 1.2-m (48-in.) diameter water line, a 2.7-m (108-in.) diameter force main, a 0.8-m (30-in.) diameter water line and a 1.1-m (42-in.) diameter water line, all with varying degrees of redundancy. A compensation grouting program was designed, tested and implemented to reduce the risk of settlement of these utilities during tunneling. Challenges with this scope of work included site locations with access constraints, complex subsurface conditions, and very sensitive utilities with varying foundation systems. Compensation grouting parameters were established through an effective trial program and the grouting was then implemented in conjunction with an extensive monitoring program. Potential settlements of the utilities during tunneling of up to 13 mm (0.5 in.) were successfully mitigated by the compensation grouting program. This paper will discuss details of the trial and production grouting programs implemented during this critical portion of the Anacostia River Tunnel construction.
Compensation Grouting Program to Mitigate Settlement of Utilities from Tunneling
Myers, James C. (author) / Taylor, Jonathan (author) / Spiteri, Lucian P. (author)
IFCEE 2018 ; 2018 ; Orlando, Florida
IFCEE 2018 ; 189-200
2018-06-06
Conference paper
Electronic Resource
English
Compensation Grouting Program to Mitigate Settlement of Utilities from Tunneling
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