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 Back to Projects
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Project:
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Shaft Support for Coal Mine Ventilation
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Location:
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Williamsville, Illinois
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Client:
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Gunther Nash Mining Construction Company
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Description:
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Ground freezing was used for shaft excavation support for two adjacent ventilation shafts. Each
shaft measured approximately 25 feet in diameter and extended through 100 feet of water bearing
sands. The freeze pipes were then drilled an additional 35 feet into the highly weathered bedrock
to ensure a water-tight barrier during excavation.
The groundwater table was approximately 12 feet below the existing ground surface. The contractor
constructed a template of ring beams and wooden lagging to not only support the unsaturated soil,
but to also establish vertical control of the excavation. The shaft was excavated using
conventional air hammers, but also blasting of the frozen soil near the bedrock. Excavation
proceeded ten feet into the bedrock, where the final concrete lining was constructed using
bottom-up forming methods.
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