Numerical modeling for the coupled thermo-mechanical processes and spalling phenomena in äspö pillar stability experiment (APSE)

T. Koyama, M. Chijimatsu, H. Shimizu, S. Nakama, T. Fujita, A. Kobayashi, Y. Ohnishi

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

In this paper, the coupled thermo-mechanical (TM) processes in the Äspö Pillar Stability Experiment (APSE) carried out by the Swedish Nuclear Fuel and Waste Management Company (SKB) were simulated using both continuum and discontinuum based numerical methods. Two-dimensional (2D) and three-dimensional (3D) finite element method (FEM) and 2D distinct element method (DEM) with particles were used. The main objective for the large scale in situ experiment is to investigate the yielding strength of crystalline rock and the formation of the excavation disturbed/damaged zone (EDZ) during excavation of two boreholes, pressurizing of one of the boreholes and heating. For the DEM simulations, the heat flow algorithm was newly introduced into the original code. The calculated stress, displacement and temperature distributions were compared with the ones obtained from in situ measurements and FEM simulations. A parametric study for initial microcracks was also performed to reproduce the spalling phenomena observed in the APSE.

Original languageEnglish
Pages (from-to)58-72
Number of pages15
JournalJournal of Rock Mechanics and Geotechnical Engineering
Volume5
Issue number1
DOIs
Publication statusPublished - 2013 Feb

Keywords

  • Coupled thermo-mechanical (TM) processes
  • Distinct element method (DEM)
  • Excavation disturbed/damaged zone (EDZ)
  • Finite element method (FEM)
  • Äspö Pillar Stability Experiment (APSE)

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

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