Mechanized Tunnelling in Urban AreasDesign methodology and construction control Edited By Vittorio Guglielmetti

Table of Contents

Introduction: tunnels in urban areas and the related challenges
The opportunities
The particular challenges of urban tunnelling
The correct approach to success
A brief history of mechanized tunnelling
The scope of this book

Initial risks: definition, analysis and management
Basic definitions
Sources of initial risk in mechanized urban tunneling
Analysis and management of risks: the risk management plan
Designing for the identified risk scenario
Quantifying the risk of time and cost overruns at the design stage with the use of DAT
Use of Plan for Advance of Tunnel (PAT) for controlling the residual risks 

Selection of tunnel alignment with low-level risks
Introduction
The general layout of an urban tunnel
Alignment constraints and specific functional requirements
Constraints and peculiar characteristics of the urban environment relevant to the selection of a tunnel route
Starting and arrival points, shield launching and receiving shafts, logistic work sites
The relationship between the excavation of running tunnel by TBM and the construction of the stations
Conclusions

The primary responses to the initial risks: a "city machine" and its essential characteristics
Principles for making the macro choices
The common solution: a "city machine"
Essential components of a "city machine"
Slurry and earth pressure balance shields: functioning principles and review of the state of the art
Some considerations for the choice between HS and EPBS

Tunnel design
Prediction and control of tunnelling-induced settlements and assessment of their impacts
The design of face-support pressure
The design of precast concrete segmental lining
Backfilling of the tail void

The control of tunnel construction
Updating and implementation of PAT
Excavation control: the case of slurry/hydro shield (SS/HS)
Excavation control: the case of earth pressure balance shield (EPBS)
Integrated real-time monitoring system

Health and safety
General considerations
TBM working environment
Critical processes
Additional critical elements
Emergencies

Case histories
EOLE project - Paris
St. Petersburg metro
Porto light metro
Turin metro line 1
SMART solution of Kuala Lumpur (Malaysia)
High speed railway line of Nodo di Bologna

References

Appendices
Appendix 1 Type and characteristics of TBMs
Appendix 2 TBM manufacturers from the new millennium
Appendix 3 Geotechnical investigations for tunnelling in urban areas
Appendix 4 Description of the principal elements of the 12 analytical methods for defining face-support pressure
Appendix 5 An example of risk management plan for a job using slurry shield
Appendix 6 Typical excavation procedures for EPB shield
Appendix 7 The Italian experiences

Annex
Contract and construction aspects

Glossary of terms
Index