Construction Stage Analysis for Tunnelling
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Transcript of Construction Stage Analysis for Tunnelling
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10thMIDAS International Technical Seminar
JaeSeok Yang MIDAS Information Technology
2013. 11. 05
Construction Stage Analysis forTunnelling
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Part 1. Introduction
Part 2. Tunnel construction
Part 3. Simulation of the construction process
Part 4. Project Applications
Part 5. Conclusion
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Construction Stage Analysis forTunnelling
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Geotechnical & Tunnel analysis SystemIntroduction
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Why use numerical methods to analyse tunnel construction?
Simulate the construction sequence
Deal with complex ground conditions
Model realistic soil behaviour
Handle complex hydraulic conditions
Deal with ground treatment (e.g. compensation grouting)
Account for adjacent services and structures
Simulate intermediate and long term conditions
Deal with multiple tunnels
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Geotechnical & Tunnel analysis SystemIntroduction
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Can unconventional Tunnel Intersections be modeled?
Yes, tunnels with unconventional connection galleries can be modeled with the esse
ntial tools provided.
All types of T-type/Y-type intercon
nections, curved tunnels, shaft-lat
eral-main tunnel connections, tunnel entrances, even subway station
s can be easily modeled in detail.
Why midas GTS?
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Geotechnical & Tunnel analysis SystemIntroduction
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Can Shield TBM be modeled?
Yes, TBM modeling, considering excavation sequences, is available.
Automated and realistic construction st
age definition for sequential activation
and deactivation of excavation segmen
ts, structural parts, loads and boundary
conditions.
Why midas GTS?
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Geotechnical & Tunnel analysis SystemIntroduction
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Tunnel Section
B-Spline
Polyline
TunnelSection
Line
3C 3C+I
5C 5C+I
LineArcCircleEllipseParabola
Hyperbola
B-SplinePoylineRectanglePolygonProfile
Tunnel Section
Curve Types
Curve Modeling
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Geotechnical & Tunnel analysis SystemIntroduction
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Data Exchange
Import (Geometry)
Export (Geometry) Standards for Data Exchange STEP (STandardfor theExchange ofProduct Model Data)
IGES(InitialGraphicsExchangeSpecification)
STL (STereoLithography)De facto standard for RP
Neutral Format FileASCII (American Standard Code for
Information Interchange)
IGES Geometry
Generated Mesh
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Geotechnical & Tunnel analysis SystemIntroduction
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Advanced Geometry Modeling
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Geotechnical & Tunnel analysis SystemIntroduction
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Tunnel Modeling Wizard
GTS provides Tunnel Modeling Wizard for simple and regular-type 3D tunnel models.
Tunnel Modeling Wizard automatically generates full analysis data, mesh, loads,
boundary conditionsand construction stages, from the user-defined parameters.
Tunnel Modeling Wizard also provides its own file I/O service to help users
accelerate modeling works for similar models and build their own tunnel templates.
Tunnel modeling Wizard Generated Analysis Model (Mesh, LBC, CS, etc.)
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Geotechnical & Tunnel analysis SystemIntroduction
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Tunnel Modeling Wizard
Complete Model Generated by Tunnel Wizard
Front View
Iso View
Core + S/C + R/B
Analysis Data
Result Summary
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Part 1. Introduction
Part 2. Tunnel construction
Part 3. Simulation of the construction process
Part 4. Project Applications
Part 5. Conclusion
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Construction Stage Analysis forTunnelling
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Geotechnical & Tunnel analysis SystemTunnel construction
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Open faced shield tunnelling
Schematic view of shielding during tunnel excavation
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Geotechnical & Tunnel analysis SystemTunnel construction
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Tunnel Boring Machines (TBM)
Schematic view of the TBM
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Geotechnical & Tunnel analysis SystemTunnel construction
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The sprayed concrete lining (SCL) method
Schematic view of SCL method
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Geotechnical & Tunnel analysis SystemTunnel construction
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Ground response to tunnel construction
Sources of volume loss (example of the TBM)
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Part 1. Introduction
Part 2. Tunnel construction
Part 3. Simulation of the construction process
Part 4. Project Applications
Part 5. Conclusion
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Construction Stage Analysis forTunnelling
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Geotechnical & Tunnel analysis System
Simulation of theconstruction process
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Introduction
Plane strain geometry
Axi-symmetric geometry
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Geotechnical & Tunnel analysis System
Simulation of theconstruction process
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Setting up the initial conditions
If it is known:
Modelling the complete geological history of the site
If it is not known:
Input the conditions appropriate to a greenfield site
(by means of the material unit weight, the pore water pressure
profile and the coefficient of earth pressure at rest, K0)
Simulating any previous construction activities that have occurred
at the site
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Geotechnical & Tunnel analysis System
Simulation of theconstruction process
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Important boundary conditions
The boundary displacement conditions, required to represent the
far field conditions or any symmetry of the problem
Any surface traction
The excavation of solid soil elements
The construction of structural shell elements
The hydraulic conditions at the far field boundaries, the soil strata
interfaces (if an interface is between consolidating and
non-consolidating elements) and the tunnel lining itself
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Geotechnical & Tunnel analysis System
Simulation of theconstruction process
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The 'gap' method
Modelling tunnel excavation
The gap method for modelling tunnel excavation
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Geotechnical & Tunnel analysis System
Simulation of theconstruction process
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The 'convergence-confinement' method
Modelling tunnel excavation
Convergence-confinement method
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Geotechnical & Tunnel analysis System
Simulation of theconstruction process
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ExcavationInitial & Embanking
Drag & Drop
Transient Seepage
Analysis Control
Load Distribution Factors
Tree Structure
Modelling tunnel excavation
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Geotechnical & Tunnel analysis System
Simulation of theconstruction process
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The 'volume loss control' method
Modelling tunnel excavation
Volume loss method
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Geotechnical & Tunnel analysis System
Simulation of theconstruction process
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The use of solid elements
Allows the analyst a very wide range of constitutive models
Maintain an acceptable element shape (defined by the aspect
ratio of length to width)
The use of shell elements
Removes the problem of aspect ratio control
Allows more flexibility in the mesh definition
A structural nature (i.e. shear force, hoop force, and bending
moment)
Modelling the tunnel lining
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Geotechnical & Tunnel analysis System
Simulation of theconstruction process
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Modelling the tunnel lining
Gauging Element Generation
Gauging Element Results
Gauging element
l f h
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Geotechnical & Tunnel analysis System
Simulation of theconstruction process
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Modelling the connections between lining segments
Modelling segment connectionas a moment-free joint
Modelling the tunnel lining
Unrolled and rolled tunnel lining
Si l i f h
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Geotechnical & Tunnel analysis System
Simulation of theconstruction process
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Shell interface element
Input properties of the shell interface element
Modelling the tunnel lining
Input dialog foruser-defined shell interface behavior
Si l i f h
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Geotechnical & Tunnel analysis System
Simulation of theconstruction process
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Shell interface element
Modelling the tunnel lining
Example of shell interface element creation
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Part 1. Introduction
Part 2. Tunnel construction
Part 3. Simulation of the construction process
Part 4. Project Applications
Part 5. Conclusion
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Construction Stage Analysis forTunnelling
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Geotechnical & Tunnel analysis SystemProject Applications
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Geotechnical & Tunnel analysis SystemProject Applications
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Kings Cross Station
(UK)
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Geotechnical & Tunnel analysis SystemProject Applications
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Trans-Hudson
Express & StationCavern(USA)
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Geotechnical & Tunnel analysis SystemProject Applications
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Trans-Hudson
Express Dyer AvenueFan Plant (USA)
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Geotechnical & Tunnel analysis SystemProject Applications
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Helsinki Subway
Western Expansion(Finland)
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Geotechnical & Tunnel analysis SystemProject Applications
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Final Disposal
Facility PosivasONKALO (Finland)
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Part 1. Introduction
Part 2. Tunnel construction
Part 3. Simulation of the construction process
Part 4. Project Applications
Part 5. Conclusion
......... 02
......... 11
......... 17
......... 31
......... 38
Construction Stage Analysis forTunnelling
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Geotechnical & Tunnel analysis SystemConclusion
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Summary
A three dimensional engineering processMethods of simulating tunnel construction in plane strain:
the volume loss to be expected; the percentage of load removal
prior to lining construction; or the actual displacement of the
tunnel boundarySegmental linings to open or rotate at their joints, or
sprayed concrete linings to crack
View any prediction of intermediate and long term behaviour
Select constitutive models capable of reproducing field behaviour
FEM can be used to quickly assess the impact of different
influences on tunnelling-induced ground movements
Numerical analysis can incorporate adjacent influences
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Thank you!