Tunnel boring and pipe jacking

Bore diameter

m
Material strength

MPa
Rock – Unconfined uniaxial compressive strength qu (MPa)
Engine

kw
Tunnel boring machine (TBM) drilling producivity*
Drilling producivity only 0.00 m/shift 10hr shift
** As a rule of thamb 1/3 of the drilling production rate, equates to the total installation production rate
Indicative boring cycle times References
Excavation 33.3 % Howarth, 1981
Pipe installation 10 % Bruland, 1998
Jacking speed 20 % Cheema, 1999
Locomotive Travel Time 6.7 % Gong and Zhao, 2009
Drill repairs and maintenance 30 %
Production rates relative to TBM selection m/shift m/day m/week m/month
Total MTBM productivity per shift (Pipe jacking) 0.00 0.00 0.00 0.00
Gripper TBM for hard rock 0.00 0.00 0.00 0.00
Slurry TBM (Earth Pressure Balance) SPT N-value(blows/300mm) to determin Density Index (Relative Density) i.e. kPa = N-value x 2 0.00 0.00 0.00 0.00
It has been well recognized that joints or fractures have an important effect on the TBM performance (Howarth, 1981, Bruland, 1998, Cheema, 1999, Gong and Zhao, 2009). The discontinuities can facilitate rock breakage, because cracks induced by TBM cutters easily develop with the existing discontinuities. On the basis of a large number of case studies, Bruland (1998) concluded that with the decrease of joint spacing, the TBM penetration increases distinctly.
Hard rock cutter disk abrasivity.
Granite 180MPa with high quartz content 55% to 70% 30 m3/disk
Granite 120MPa with high quartz content 55% to 70% 37.3 m3/disk
Granite 120MPa 100 m3/disk
Granite 230MPa with high quartz content 55% to 70% 10 m3/disk
References:

Tunneling NATM

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