the definitive ground freezing resource
Ground freezing was selected to provide ground stabilization and water cut-off for the 2nd Avenue Subway expansion project. The use of ground freezing permitted safe mining operations with the TBM.
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Forty, 4-inch diameter, steel closed-end freeze pipes, plus a comprehensive array of piezometers and temperature monitors, installed through the overburden soils and extending 15 feet into the underlying sound rock.
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The overall project involved the freezing of four shafts excavated by conventional methods, plus an additional two shafts which were raise bored through frozen ground.
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Ground freezing was the owner’s method of choice to stabilize more than 135 feet of sand and unstable mudstone overburden to ensure completely dry and stable elevator shaft excavation.
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Moretrench used artificial ground freezing toprovide ground support and groundwater controlprotection at five shaft locations in midtown Manhattan.
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The South Tail Tunnel of the No. 7 Subway Line in NYC recently required ground freezing and permeation grouting to provide ground stabilization and groundwater cutoff.
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