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Data Acquisition in TBM tunnelling
Tim and Lars Babendererde, Frank Stahl, Philipp Elsner
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Documentation and quality control via written documents
THE 90‘S
TBM operation the 90‘s
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TBM operators were the source for what happened during tunnel excavations.
THE 90‘S
Transfer of information
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THE 90‘S
Transfer of information
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THE 90‘S VS TODAY
Significant technology jumps since the 90‘s
So did the TBMs!
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Live link to site and other offices worldwide
Even remote control possible
Documentation with specialised computer programs
TODAY
TBM control today
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TODAY
Transfer of information
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Increasing use of mobile applications
TODAY
TBM control today
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General setup of modern data monitoring
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Data points by TPB type
Any outside monitoring comes on top!
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Assumption: 2000 data points (1 TBM plus outside monitoring)
TODAY
Project data volume
Sampling rate 1/10 sec 1/1 sec
Data per day 60 MB 600 MB
Data per year 21 GB 213 GB
Avg. server size 600 GB – 1 TB
Usability on Multi-TBM or long term projects
Possible with standard
equipment Might require additional
storage capacities !
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Human being incapable of overseeing the information
Filtering and sorting required by
Graphical processing for better overview
Automatic reporting
Automatic monitoring and alarming based on pre-set levels
Saving of all data for later back-analysis as required
TODAY
Flood of information
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Subway tunnel project in Germany
Gear damage
10 sec data sampling showed torque within permissible limit
Reset of sampling rate to 1/1 sec showed torque peaks above permissible limit
CASE 1
Machine damage by torque peaks
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Subway tunnel project in Germany
Cause of damage: safety devise was loosing pre-stress level over time
CASE 1
Machine damage by torque peaks
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CASE 2
Metro Cairo
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Eyewitness reported collapsed ring
CASE 2
Metro Cairo
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TBM data confirmed eyewitness reports
TBM data also revealed possible cause
CASE 2
Metro Cairo
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CASE 2
Metro Cairo
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CASE 2
Metro Cairo
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Crossing the Thames with vertically curved alignment and low cover under constantly changing tidal influence
CASE 3
London, C310 – Thames Tunnel Construction
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Problem:
Face support pressure control with tidal range of 0,5 bar
High tide pressure exceeded blowout safety during low tide
CASE 3
London, C310 – Thames Tunnel Construction
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Solution:
Direct face support pressure control via tidal reading and monitoring system
CASE 3
London, C310 – Thames Tunnel Construction
Real-time calculation
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Crossing of the Serra do Mar State Park with tunnel and shafts
CASE 4
Tunnel GASTAU
Tunnel
Shaft
Refinery
Pipeline
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5 km straight line tunnel with 3% inclination
~ 550m deep shafts
Practically no boring logs for 90% of the tunnel
CASE 4
Tunnel GASTAU
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Excavation with double-shield TBM
Geological mapping via face mapping (one every one or two days)
TBM data used for geotechnical evaluation between face mappings
CASE 4
Tunnel GASTAU
Drilling speed
Advance force
Torque
Penetration rate
RPM
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TBM data acquisition has changed significantly in the last 20 years
Remote live access to thousands of data points is possible
Adequate software support is necessary to manage the flood of information
High data rates and many data points are recommended for possibility of back analysis
Summary
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Thank you for your attention!
Tim and Lars Babendererde, Frank Stahl, Philipp Elsner
