TUNNELLING - NATM

 Tunnel Advance Rates (m/day)

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

NATM Tunnels

Task / Description Slow   Ave   Fast    Units
 Standard Advance Method, used on tunnels with max diameter -   7.0  -    m
 Half Face Advance Method, used on tunnels with max diameter -   10.0  -    m
 Double side Drift Advance Method, used on tunnels with diameter over -   10.0  -    m
 Double side Drift Advance Method, used on tunnels with diameter over -   10.0  -    m
 Excavation, London Clay, internal diameter under 7.0m 2.5  2.9  3.2   m/day
 Excavation, London Clay, internal diameter 7.0-10.0m 1.5  2.0  2.5   m/day
 Excavation, London Clay, internal diameter over 10.0m 1.0  1.3  1.5   m/day
 Excavation, Woolwich/Reading Beds, internal diameter 2.0-7.0m 1.5  1.8  2.0   m/day
 Excavation, Woolwich/Reading Beds, internal diameter 7.0-10.0m -   1.5  -    m/day
 Excavation, Woolwich/Reading Beds, internal diameter over 10.0m -   1.0  1.5   m/day
 Excavation, London Clay, Inclined Tunnels, diameter 2.0-7.0m 1.5  2.0  3.2   m/day
 Excavation, London Clay, Inclined Tunnels, diameter 7.0-10.0m 0.5  1.0  2.2   m/day
 Excavation, London Clay, Vertical Shafts, diameter 2.0-9.0m 1.0  1.5  2.2   m/day
 Excavation, London Clay, Vertical Shafts, diameter 9.0-15.0m 0.5  1.0  2.6   m/day
 Excavation, London Clay, Circulation Halls 0.8  1.0  1.2   m of circumf/day
 Excavation, London Clay, Junction Excavation -   0.2  -    m/day
 Mucking Capacity, 1 access with 2 crews 190.0  225.0  279.0   m3/day
 Mucking Capacity, 1 access with 4 crews 255.0  300.0  366.0   m3/day
 Mucking Capacity, 2 access with 4 crews 382.0  450.0  549.0   m3/day
 Sprayed Secondary Lining, Tunnels, diameter under 6.5m 2.1  2.5  2.8   m/day
 Sprayed Secondary Lining, Tunnels, diameter over 6.5m 1.5  2.0  2.4   m/day
 Sprayed Secondary Lining, Inclined Tunnels, diameter under 6.5m 1.5  2.0  2.3   m/day
 Sprayed Secondary Lining, Inclined Tunnels, diameter over 6.5m 1.0  1.5  1.9   m/day
 Sprayed Secondary Lining, Vertical Shafts, diameter under 6.5m 1.8  2.0  2.5   m/day
 Sprayed Secondary Lining, Vertical Shafts, diameter over 6.5m 2.2  2.5  3.1   m/day
 Sprayed Secondary Lining, Circulation Halls, diameter under 11.0m -   2.0  2.3   m/day
 Sprayed Secondary Lining, Intermediate Landing Tunnels with columns 1.7  2.0  2.1   m/day
 Sprayed Secondary Lining, Intermediate Landing Tunnels without columns 1.6  2.1  2.3   m/day
 Sprayed Secondary Lining, Tunnel Junctions -   0.2  0.3   m/day
 Insitu Permanent Lining, 12m bays, 350-400mm reinforced with PCV backing -   8.4  12.0   m/day
 Insitu Permanent Lining, extra over excavate/lining time to allow for permanent lining -   25.0  -    %
 Excavate and Line Cycle Time , Running Tunnels 3.2  4.0  4.9   m/day
 Excavate and Line Cycle Time, Station Access Adits 3.3  3.9  4.2   m/day
 Excavate and Line Cycle Time, Concourse Tunnels 2.2  2.5  2.7   m/day
 Excavate and Line Cycle Time, Escalator Tunnels 1.2  1.5  1.7   m/day

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