The Hemphill Pump Station, part of the City of Atlanta Raw Water Supply Program, consists of five shafts each equipped with a deep submersible pump. The shafts are approximately 420 feet deep, 9.5 feet in excavated diameter, and will be constructed from the ground surface using blind bore drilling techniques primarily in hard and abrasive metamorphic rocks. Welded steel liners will be lowered into the shafts and grouted in place. A grouting program is implemented before commencing shaft excavations to reduce the rock mass permeability and to prevent potential drilling fluid losses during shaft development. Plaxis3D is used to model the junctions between the shafts and adjacent tunnel to ensure the stability of the pillars between the shafts.
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