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Work package 6:
Colorado School of Mines. C. Frenzel

Mining Engineering Department

1. Subject:

This workpackage deals with mechanical rock excavation in several applications. That includes tunnel boring machines (TBM), shaft boring system (SBS), and undercutting method.

  • Fundamental understanding of mechanical fragmentation processes
  • Fundamental understanding of wear processes
  • Analysis of fracture initiation and propagation
  • Numerical modeling of fragmentation process
  • Devlopment of empirical models
  • Probabalistic approaches for prediction models
  • Hierarchical input parameters for prediction models

2. Methods

  • Linear cutting tests (LCM)
  • Rotary cutting tests
  • High-speed imaging
  • Fracture mapping
  • Numerical Modeling (PFC - Particle Flow Code, Itasca)

3. Objectives:

  • Development of a fundamental understanding of cutting process
  • Modelling
  • Verification of existing disc cutting models (Gehring, CSM)
  • Establish structured approach for model input data

4. Approach

  • Cutting process
    • Perform linear cutting tests
    • Monitor chip creation and velocities using high-speed imaging
    • Obtain core samples for fracture mapping below cutting kerf
    • Collect cuttings for size analysis
  • Modelling
    • Complex 3D-PFC model for cutting process
    • Validate numerical model
    • Derive simple approximation
  • Verification of existing disc cutting models (Gehring, CSM)
    • Check existing and new cutting data against Gehring's and CSM's models
    • Compare mathematical approaches and simply models
  • Model input data
    • Develop hierarchy of input data reflecting knowledge at different project stages
    • Gather emipircal data to substitute actual input by assumptions
    • Verify model with field data

5. Dissertations:

To be defined

6. Publications:

C. FRENZEL: Werkzeugverschleiss bei Tunnelvortriebsmaschinen (Wear of cutting tools for tunnel boring machines), In: DGGT - Deutsche Gesellschaft für Geotechnik e.V. (ed.): Taschenbuch für den Tunnelbau 2011, Essen (Glückauf), 2010

C. FRENZEL, W. BURGER & F. DELABBIO: Shaft Boring Systems for Mechanical Excavation of deep shafts, In: Y. Potvin (ed.): Caving 2010, Perth, Australia, 2010

W. BURGER, F. DELABBIO & C. FRENZEL: Accessing deep ore bodies using mechanical excavation systems, In: SME Annual Meeting, Phoenix, USA, 2010

KÖPPL, F., FRENZEL, CH. & THURO, K.: Statistische Modellierung von Gesteinsparametern für die Leistungs- und Verschleißprognose bei TBM-Vortrieben. - In: Schwerter, R. (ed.): Tagungsband der 17. Tagung für Ingenieurgeologie mit Forum für junge Ingenieurgeologen, Hochschule Zittau-Görlitz, Fachsektion Ingenieurgeologie, Deutsche Gesellschaft für Geotechnik, 415-418, 2008

C. FRENZEL & C. HOWARTH: Tunnel Boring Machines and Their Application in Roadway Development, In: ACARP Roadway Development Workshop, Polkobin/Penrith/Mackay, Australia, March 3-6, 2009

C. FRENZEL & R. RANDAXHE: Development of Block Caving Mines with Mechanized Excavation, In: P. N. Martens (ed.): 5th Aachen International Mining Symposium, "High Performance Mining", RWTH Aachen, Germany, 2009

M. VILLENEUVE, M. DIEDERICHS, P. KAISER AND C. FRENZEL: Geomechanical characterisation of massive rock for deep TBM tunneling, In: Proceedings of the 3rd Canada-US Rock Mechanics Symposium, Toronto, Canada, May 10-13, 2009

C. FRENZEL: Cutting Tools, In: Wissenschaftsstiftung Deutsch-Tschechisches Institut (ed.): Schildvortrieb mit Tübbingausbau, 2008

FRENZEL, CH., KäSLING, H. & THURO, K.: Factors Influencing Disc Cutter Wear. - Geomechanik & Tunnelbau 1 (1): 55-60, 2008

C. FRENZEL & J. GRUSECK: Höchste Anforderungen an Werkstoffe - Schneidringe im maschinellen Tunnelbau (Extraordinary Challenges for Materials - Cutter Rings for Mechanized Tunnelling), In: Stahltag 2007 Stahlforum "Stahl - Höchstleistungen im Schwermaschinen" on November 7, 2007

M. VILLENEUVE, M. DIEDERICHS, P. KAISER AND C. FRENZEL: Geomechanical characterisation of massive rock for deep TBM tunneling, In: Proceedings of Canada-US Rock Mechanics Symposium, Vancouver, Canada, May 27-30, 2007

M. VILLENEUVE, M. DIEDERICHS, P. KAISER, C. FRENZEL AND U. REHM: Effects of Mineralogy and Tectonic Deformation History on TBM Advance in Deep Tunnelling, In: Proceedings of Alptransit Geological Symposium, Zürich, Switzerland, September 26-30, 2005

M. HERRENKNECHT & C. FRENZEL: Lange TBM-Vortriebe im Hartgestein - Eine Zwischenbilanz (Long TBM tunnels in hard rock - an intermediate review), - Bauingenieur, Nr. 80, 2005