The Geological Society – 17 th October 2014 Use of the 3D Geological model with SCL Tunnelling in Crossrail Farringdon Station 1 Dr. Sauer & Partners The Geological Society – 17 th October 2014 Use of the 3D Geological model with SCL Tunnelling in Crossrail Farringdon Station 1 Paula Cabrero - Geotechnical Eng C435 Dr Angelos Gakis - Chief Geotechnical Eng C435 Use of the 3D Geological model with SCL Tunnelling in Crossrail Farringdon Station
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The Geological Society – 17th October 2014 Use of the 3D Geological model with SCL Tunnelling in Crossrail Farringdon Station 1
Dr. Sauer & Partners
The Geological Society – 17th October 2014 Use of the 3D Geological model with SCL Tunnelling in Crossrail Farringdon Station 1
Paula Cabrero - Geotechnical Eng C435 Dr Angelos Gakis - Chief Geotechnical Eng C435
Use of the 3D Geological model with SCL Tunnelling in Crossrail Farringdon Station
The Geological Society – 17th October 2014 Use of the 3D Geological model with SCL Tunnelling in Crossrail Farringdon Station 2
AGENDA
• Farringdon Station overview.
• The Geology of Farringdon Station.
• Evolution of Farringdon 3D Geological Model.
• Integration of tunnel excavation data in the 3D Model.
• Faults in Farringdon Station.
• Case Study: Wraparound PL2RC.
• Conclusions.
The Geological Society – 17th October 2014 Use of the 3D Geological model with SCL Tunnelling in Crossrail Farringdon Station 3
• In the heart of Crossrail
• Connecting 3 Networks
• Receiving 4 TBMs
• Constructed using Sprayed Concrete Lining (SCL) techniques
Farringdon Station
The Geological Society – 17th October 2014 Use of the 3D Geological model with SCL Tunnelling in Crossrail Farringdon Station 4
Farringdon Station
The Geological Society – 17th October 2014 Use of the 3D Geological model with SCL Tunnelling in Crossrail Farringdon Station 5
CH1 Pilot Tunnel PTW Enlargement
The Geology of Farringdon Station.
PL2RC
LC
UMB
UMB
UMB
UMB
LTB
LTB
LSB
LSB
LSB
LMB
LMB
LMB
GRAVEL
GRAVEL
GRAVEL
UF
UF
The Geological Society – 17th October 2014 Use of the 3D Geological model with SCL Tunnelling in Crossrail Farringdon Station 6
Evolution Farringdon 3D Geological Model
• 2009: Initial 3D geological model for Farringdon Station by BGS.
• March 2013: DSP join the GSI3D consortium.
• April 2013: DSP/BFK receive the original Farringdon model from BGS.
• April – May 2013: 3D model updated with additional GI data.
• May 2013 – Today: Tunnel excavation data is being incorporated.
The Geological Society – 17th October 2014 Use of the 3D Geological model with SCL Tunnelling in Crossrail Farringdon Station 7
Integrating tunnel excavation data
• Ground observation.
• Geological sketch.
• Geotechnical log.
• Data input in GSI3D.
UMB
LTB LSB
LMB SAND
LMB CLAY
The Geological Society – 17th October 2014 Use of the 3D Geological model with SCL Tunnelling in Crossrail Farringdon Station 8
Integrating tunnel excavation data
The Geological Society – 17th October 2014 Use of the 3D Geological model with SCL Tunnelling in Crossrail Farringdon Station 9
Integrating tunnel excavation data
The Geological Society – 17th October 2014 Use of the 3D Geological model with SCL Tunnelling in Crossrail Farringdon Station 10
Faults
• Farringdon Fault.
• Smithfield Fault.
• St. John Street Fault.
• Chaterhouse Fault.
The Geological Society – 17th October 2014 Use of the 3D Geological model with SCL Tunnelling in Crossrail Farringdon Station 11
Faults
• Farringdon Fault.
• Smithfield Fault.
• St. John Street Fault.
• Chaterhouse Fault.
The Geological Society – 17th October 2014 Use of the 3D Geological model with SCL Tunnelling in Crossrail Farringdon Station 12
Faults
• Farringdon Fault.
• Smithfield Fault.
• St. John Street Fault.
• Chaterhouse Fault.
The Geological Society – 17th October 2014 Use of the 3D Geological model with SCL Tunnelling in Crossrail Farringdon Station 13
Faults
• Farringdon Fault.
• Smithfield Fault.
• St. John Street Fault.
• Chaterhouse Fault.
The Geological Society – 17th October 2014 Use of the 3D Geological model with SCL Tunnelling in Crossrail Farringdon Station 14
Faults
Farringdon F.
Farringdon F.
St. John’s Street F.
Smithfield F. PTE Invert
The Geological Society – 17th October 2014 Use of the 3D Geological model with SCL Tunnelling in Crossrail Farringdon Station 15
Faults
St. John’s Street Fault
The Geological Society – 17th October 2014 Use of the 3D Geological model with SCL Tunnelling in Crossrail Farringdon Station 16
Sand Lenses and Faults
The Geological Society – 17th October 2014 Use of the 3D Geological model with SCL Tunnelling in Crossrail Farringdon Station 17
Case Study: Wraparound PL2RC
Target:
To design & Construct a Wraparound without any rebar or thickening to connect SCL and TBM works
SCL Risks:
Sand Lenses and Farringdon Fault
The Geological Society – 17th October 2014 Use of the 3D Geological model with SCL Tunnelling in Crossrail Farringdon Station 18
Case Study: Wraparound PL2RC
• Integral Part of Site Supervision
• Constantly updated with additional excavation data
• Enables predictions of increasing accuracy
The Geological Society – 17th October 2014 Use of the 3D Geological model with SCL Tunnelling in Crossrail Farringdon Station 19
Case Study: Wraparound PL2RC
The Geological Society – 17th October 2014 Use of the 3D Geological model with SCL Tunnelling in Crossrail Farringdon Station 20
Case Study: Wraparound PL2RC
The Geological Society – 17th October 2014 Use of the 3D Geological model with SCL Tunnelling in Crossrail Farringdon Station 21