Tunnel Advance Rates (m/day)
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Tunnel In London Clay
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ID < 7.0 m
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2.5 - 3.0 m/day
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ID 7.0 - 10.0 m
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1.5 - 2.5 m/day
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ID > 10.0 m
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1.0 - 1.5 m/day
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Tunnel In Woolwich & Reading Beds
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ID < 7.0 m
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1.5 - 2.0 m/day
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ID 7.0 - 10.0 m
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1.5 m/day
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ID > 10.0 m
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1.0 m/day
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Inclined Tunnels
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ID < 7.0 m
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2.0 m/day
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ID 7.0 - 10.0 m
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1.0 m/day
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Vertical Shafts
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ID < 9.0 m
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1.5 m/day
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ID 9.0 - 15.0 m
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1.0 m/day
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Circulation Halls
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1 m of hall circumference/day.
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Excavation Of Junctions
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1 junction in 6 days = 0.17 m/day
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Secondary Tunnel Lining Rates
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Tunnels
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ID < 6.5 m
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2.5 m/day
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ID > 6.5 m
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2.0 m/day
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Inclined Tunnels
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ID < 6.0 m
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2.0 m/day
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ID > 6.0 m
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1.5 m/day
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Vertical Shafts
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ID < 9.0 m
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2.0 m/day
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ID > 9.0 m
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2.5 m/day
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Circulation Halls
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ID 11.0 m
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2.0 m/day
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Intermediate Landings
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With Columns
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2.0 m/day and individual tunnel
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Without Columns
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2.0 m/day
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Junctions
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1 junction in 4 days = 0.25 m/day
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