INSIGHTS INTO THE DYNAMIC RESPONSE OF TUNNELS IN JOINTED ROCKS

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Tunnels in jointed rocks can be subjected to severe dynamic loads because of rock bursts, coal bumps, and large earthquakes. A series of 3-dimensional simulations was performed, based on discrete element analysis to gain insights into the parameters that influence the response of such tunnels. The simulations looked at the effect of joint set orientation, the effect of joint spacing, the effect of peak displacement for a given peak velocity, the effect of pulse peak velocity for a given displacement, the influence of using rigid versus deformable blocks in the analyses, and the effect of repeated loading. The results of ... continued below

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Heuze, F E & Morris, J P February 17, 2005.

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Tunnels in jointed rocks can be subjected to severe dynamic loads because of rock bursts, coal bumps, and large earthquakes. A series of 3-dimensional simulations was performed, based on discrete element analysis to gain insights into the parameters that influence the response of such tunnels. The simulations looked at the effect of joint set orientation, the effect of joint spacing, the effect of peak displacement for a given peak velocity, the effect of pulse peak velocity for a given displacement, the influence of using rigid versus deformable blocks in the analyses, and the effect of repeated loading. The results of this modeling were also compared to field evidence of dynamic tunnel failures. This comparison reinforced the notion that 3-dimensional discrete element analysis can capture very well the kinematics of structures in jointed rocks under dynamic loading. The paper concludes with a glimpse into the future. Results are shown for a 3-dimensional discrete element massively parallel simulation with 100 million contact elements, performed with the LLNL LDEC code.

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PDF-file: 27 pages; size: 56.1 Mbytes

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  • Presented at: 40th U.S. Rock Mechanics Symposium, Anchorage, AK, United States, Jun 25 - Jun 29, 2005

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  • Report No.: UCRL-CONF-207723-REV-1
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 917906
  • Archival Resource Key: ark:/67531/metadc889433

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  • February 17, 2005

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  • Sept. 22, 2016, 2:13 a.m.

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  • Nov. 29, 2016, 3:58 p.m.

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Heuze, F E & Morris, J P. INSIGHTS INTO THE DYNAMIC RESPONSE OF TUNNELS IN JOINTED ROCKS, article, February 17, 2005; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc889433/: accessed October 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.