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 Back to Projects
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Project:
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Frozen Earth Support for Crown Pillar Excavation
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Location:
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Rouyn-Noranda, Quebec
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Client:
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Noranda
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Description:
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This project is the largest structural excavation using ground freezing as a method of earth
support. The completed excavation had a diameter of 220 feet and extended 125 feet deep into
the crown pillar of an existing zinc and nickel mine.
A unique aspect of this project was the very high water content clay. This clay not only had
a very low unfrozen strength, but was also classified as a “sensitive” clay. A comprehensive
series of laboratory tests and finite element modeling was used to design a system of three
rows of freeze pipes. Prior to excavation, a 35-foot thick frozen earth wall was formed,
permitting excavation to the crown pillar.
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