The updated NTNU TBM prediction model (PDF Download Available)
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The updated NTNU TBM prediction model (PDF Download Available)
Update and enlarge TBM specifications. New classification of the rock mass. Fracture classes for low degree of fracturing. Recommended RPM based on ...
The updated NTNU TBM prediction model Javier Macias NTNU/SINTEF
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Common prediction models for hard rock TBMs
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Timeline: NTNU prediction model
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The NTNU prediction model
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Philosophy: rock properties versus machine parameters
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Estimate penetration rate, cutter life, advance rate and excavation costs
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Project site detailed studies in more than 40 tunnelling projects (Norway and abroad) involving more than 300 kilometres of tunnel
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Systematised and normalised data
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Representative of well-organised tunnelling projects
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The last update is going to be published included in the PhD Thesis at NTNU: Hard Rock Tunnel Boring: Performance predictions and cutter life assessments (Macias, 2016).
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Parameters of the NTNU prediction model
Penetration Rate Model: Rock Parameters Intact Rock Properties
Rock Mass Parameter
Drilling Rate Index, DRI
Rock Mass Fracturing Factor, ks
Porosity
Cutter Life Model:
Machine Parameters
Rock Parameters
Machine Parameters
TBM diameter
Cutter Life Index, CLI
TBM diameter
Abrasive mineral content (%)
Cutterhead RPM
Number of cutters Cutter diameter Average cutter spacing
Number of cutters
Cutterhead RPM
Cutter diameter
Average cutter thrust Average cutter thrust
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Flow chart - NTNU advance rate model methodology
Cutter life
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Highlights: Update NTNU prediction model Update and enlarge TBM specifications New classification of the rock mass Fracture classes for low degree of fracturing Recommended RPM based on analysis of RPM influence in the penetration rate New: RPM factor on net penetration rate Cutter life: Update basic cutter ring life New: cutter thrust influence on cutter consumption Utilization: New: tunnel length factor
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Update and enlarge TBM specifications
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Revised classification of rock mass
Fissure
Joint
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Fracture classes
Fissure class (St) (Bruland, 1998)
Fracture Class (Sf)
0 0+ 0-I II II III IV
0 1 2 3 4 5 6 7
Average spacing between fractures af (cm) ∞ 320 160 80 40 20 10 5
Non fracture Extremely low Very low Low Medium High Very high Extremely high
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RPM influence on TBM penetration rate
Maximum NPR (m/h)
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RPM influence on penetration rate
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RPM influence on TBM penetration rate
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RPM factor on net penetration rate
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Basic cutter ring life
21%
20%
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Basic cutter ring life
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Cutter thrust influence on cutter consumption
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Cutter thrust influence on cutter consumption
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Tunnel length factor
Low skill level and tunnel system quality
High skill level and tunnel system quality
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Tunnel length factor
Transport system Supply delays Tunnel installation
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Summary: Update NTNU model: Update and enlarge TBM specifications New classification of the rock mass Fracture classes for low degree of fracturing New: RPM factor on net penetration rate Update basic cutter ring life New: cutter thrust influence on cutter consumption New: tunnel length factor New edition NTNU model included in PhD Thesis: "Hard Rock Tunnel Boring: Performance predictions and cutter life assessments" (Macias, 2016) •
