TBM Tunnelling in Jointed and Faulted Rock: 1st Edition (Hardback) book cover

TBM Tunnelling in Jointed and Faulted Rock

1st Edition

By Nick R. Barton

CRC Press

184 pages

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Hardback: 9789058093417
pub: 2000-01-01
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This practical guide describes the stage-by-stage development of a method for predicting the penetration rate (PR) and the advance rate (AR) for tunnel boring machines based on an expanded version of the Q-value, QTBM. The author analyzes 145 TBM tunnels that total 1,000km in length. He then develops simple formulae to estimate PR and AR from the QTBM value and to back-calculate QTBM from performance data. The book quantitatively explains actual advance rates as high as five m/hr for one day or as low as 0.005 m/hr for several months. It also covers logging methods, empirical TBM tunnel support design, and numerical verification of support.

Table of Contents



Part 1: Basic interactions between the rock mass and the TBM

1. Introduction

2. Some basic TBM designs

3. Summary of common geotechnical problems

4. The TBM excavation disturbed zone

5. Basic factors affecting penetration rate

6. Penetration rate and thrust per cutter

7. The possible influence of stress and strength ratios

8. Basic mechanism of chip formation with roller cutters

9. Tensile strength and its anisotropy

10. Penetration rate and fabric anisotropy

11. Penetration rate, joint spacing and joint character

Part 2: Q, QTBM and rock mass variability

12. TBM performance and rock mass classification

13. TBM performance and Q-system parameters

14. TBM performance and the initial requirements for 'QTBM'

15. The law of decelerating advance rates

16. Utilisation and its decay with time

17. Unexpected events and their Q-values

18. Water inflows in TBM driven tunnels

19. Consequences of limited stand-up time in TBM tunnels

20. The relationship between PR, AR and QTBM

21. Rock mass variability and its effect on predicted performance

22. Fine-tuning QTBM for anisotropy

23. Cutter wear and its effect on PR and AR

24. Effect of porosity and quartz content on gradient m and PR

25. Tunnel size effects

26. Boring in exceptionally tough, high-stress conditions

27. Revisiting cutter force effects

28. Predicting advance rates in faulted rock

Part 3: Logging, tunnel support, probing and design verification

29. TBM Q-logging and tunnel scale effects

30. Rock support methods commonly used in TBM tunnels

31. Some support design details for TBM tunnels

32. Probing and convergence measurement

33. Probing and seismic or sonic logging

34. Verifying support classes with numerical models

35. Logging rock quality and support needs

36. TBM or drill-and-blast excavations

37. Conclusions


A1 Q-method of rock mass classification

A2 QTBM - the final version of Figure 44

A3 Input data summary for estimating PR and AR using QTBM

A4 Worked example



About the Author

Nick Barton has over 40 years of international experience in rock engineering, and has been involved in numerous important and iconic tunnel, cavern and rock slope projects. He has developed many tools and methods, such as the widely used Q-system, for rock classification and support selection and the Barton-Bandis constitutive laws for rock joint computer modeling. He currently teaches at the University of São Paulo and manages an international consultancy (Nick Barton & Associates, São Paulo – Oslo).

Dr. Nick Barton was the 2011 recipient of the distinguished Müller Award, an award that honours the memory of Professor Leopold Müller, the founder of the ISRM (International Society of Rock Mechanics), and awarded in recognition of distinguished contributions to the profession of rock mechanics and rock engineering.

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