Engineering Joint Venture Gotthard Base Tunnel South NFF – Norsk Forening for Fjellsprengningsteknikk 2016 „TBM Applications“ St. Gotthard Railway Tunnel Experience versus planning, lessons learned M.Sc. Thomas Jesel Amberg Engineering Ltd., Regensdorf, Switzerland
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Engineering Joint Venture Gotthard Base Tunnel South
NFF – Norsk Forening for Fjellsprengningsteknikk 2016 „TBM Applications“
St. Gotthard Railway TunnelExperience versus planning, lessons learned
M.Sc. Thomas JeselAmberg Engineering Ltd., Regensdorf, Switzerland
Engineering Joint Venture Gotthard Base Tunnel South
Engineering Joint Venture Gotthard Base Tunnel South
Tunnel SystemNFF, Bergen, Norway, June 6-7 2016
STC (Swiss Tunnel Congress) www.alptransit.ch
Engineering Joint Venture Gotthard Base Tunnel South
Geological Longitudinal Section
Aar Massife CZ
TZM
UG
Z Gotthard-Massife
Penninic gneiss zoneP
ioraGeolog.
formation
Portal Erstfeld Amsteg Sedrun Faido Portal Bodio
NFF, Bergen, Norway, June 6-7 2016
Engineering Joint Venture Gotthard Base Tunnel South
Excavation MethodNFF, Bergen, Norway, June 6-7 2016
Engineering Joint Venture Gotthard Base Tunnel South
TBMNFF, Bergen, Norway, June 6-7 2016
4 Herrenknecht TBM Open gripper shield Length
TBM: 26 mBack-up: 450 m
Cutter headDiameter: 9.43 mShifted, max: 9.53 mWeight: 240 t
Discs: Number: 66Diameter: 17’’
Engineering Joint Venture Gotthard Base Tunnel South
Experience, FaidoNFF, Bergen, Norway, June 6-7 2016
Requirements Cutter head wear Water inflow Rock burst Squeezing rock Blocked TBM
Engineering Joint Venture Gotthard Base Tunnel South
Requirements INFF, Bergen, Norway, June 6-7 2016
Reduced flexibility Small areas where support
can be applied Requirements sometimes
contra dictionary Set right focus to get right TBM! Wrong focus - wrong TBM
Engineering Joint Venture Gotthard Base Tunnel South
Requirements IINFF, Bergen, Norway, June 6-7 2016
Detailed description of geology Most probable geology Hazard scenarios Set right focus Optimize TBM for project
Worst case geology Hazard scenarios Feasibility check Action plan Must be feasible
Engineering Joint Venture Gotthard Base Tunnel South
Cutter head wear INFF, Bergen, Norway, June 6-7 2016
Abrasivity with Cherchar index Tender design: CAI 2.8 Medelser Granite CAI 4.4 Lucomagno Gneiss CAI 3.4
Medelser granite
Lucomagno Gneiss
Engineering Joint Venture Gotthard Base Tunnel South
Cutter head wear IINFF, Bergen, Norway, June 6-7 2016
Instable face Not all discs at face Reduced face pressure Reduced cutting speed Blocks at the face Cutter head as crusher Rolling blocks hits the disks
Engineering Joint Venture Gotthard Base Tunnel South
NFF, Bergen, Norway, June 6-7 2016
Cutter head wear III
CAI much higher than prognosis Damaged Disks due to blocks Often longer maintenance shifts
(less time to excavate) Reduced pressure due to instable face Determinating for advance rate
Engineering Joint Venture Gotthard Base Tunnel South
Water inflow INFF, Bergen, Norway, June 6-7 2016
Water pressure up to 200 bar Probe drillings require preventer
(in sensitive areas) Needs detailed specification in
tender docs 1:1 tests on site recommended
before entering critical zone Works well for both percussion
and core drillings
Engineering Joint Venture Gotthard Base Tunnel South
Water inflow IINFF, Bergen, Norway, June 6-7 2016
Water inflow initial max 100 l/s Ascending tunnel 600 mm drainage pipe No problem But 48°C! Cooling system limited Reduced working hours Frequent pauses required Reduced advance rate
Engineering Joint Venture Gotthard Base Tunnel South
Water inflow IIINFF, Bergen, Norway, June 6-7 2016
Drained tunnels cause settlements at surface Even in rock! Valleys open or close – depending where they
are situated on the settlement curve Can be critical for Hydropower dams (opening) Simulation and prediction very demanding Expert panel very helpful No measures from the tunnel Monitor the dam, lower the water, repair
Engineering Joint Venture Gotthard Base Tunnel South
Rock burst INFF, Bergen, Norway, June 6-7 2016
Difficult to predict Without warning – suddenly! Rock support cannot prevent
rock burst But must protect staff
TBM helps! Absorbe kinetic energy Not easy to classify,
subjective Code of classification Potential measures
Engineering Joint Venture Gotthard Base Tunnel South
Rock burst IINFF, Bergen, Norway, June 6-7 2016
Engineering Joint Venture Gotthard Base Tunnel South
NFF, Bergen, Norway, June 6-7 2016
Squeezing rock I
Started with Steel arches androck bolts and shotcrete