Geological controls on the breakthrough of tunnel boring machines in hard rock crystalline terrains

S. Yagiz, C. Merguerian, T. Kim

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

Abstract

Geological factors including the orientation, condition and frequency of discontinuities in rock mass, and also intact rock properties such as strength and brittleness are crucial parameters for performance analysis of hard rock TBMs. These data along with machine specifications such as thrust and power allow the appraisal and prediction of machine penetration rates. Recently completed projects include the Queens freshwater, Manapouri Second tailrace hydropower and the Milyang hydropower tunnels are assessed to investigate the effect of geological and rock mass conditions on the penetrability of utilized full face tunneling machines. Compilation of the experiences and datasets obtained from these projects indicates that even though intact rock properties including mineralogy, texture, metamorphic grade, hardness, strength and brittleness have an effect on the breakthrough of the machines, the most significant and controlling geological parameters are the orientation, condition and frequency of discontinuities in rock mass encountered along the tunnel. Thus, the geological conditions of the site should be investigated in early stage of the constructed tunnel and continuously updated until projects are completed.

Original languageEnglish
Title of host publicationRock Mechanics in Civil and Environmental Engineering - Proceedings of the European Rock Mechanics Symposium, EUROCK 2010
Pages401-404
Number of pages4
Publication statusPublished - Jun 15 2010
Externally publishedYes
EventEuropean Rock Mechanics Symposium, EUROCK 2010 - Lausanne, Switzerland
Duration: Jun 15 2010Jun 18 2010

Publication series

NameRock Mechanics in Civil and Environmental Engineering - Proceedings of the European Rock Mechanics Symposium, EUROCK 2010

Conference

ConferenceEuropean Rock Mechanics Symposium, EUROCK 2010
CountrySwitzerland
CityLausanne
Period6/15/106/18/10

ASJC Scopus subject areas

  • Geology
  • Geotechnical Engineering and Engineering Geology

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