Effect of element configuration on Brazilian tensile failure by DEM

S. Nakashima, K. Taguchi, N. Shimizu, T. Funatsu

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

1 Citation (Scopus)

Abstract

The Particle Flow Code (PFC), a numerical simulation code based on the distinct element method, is a useful tool for simulating the failure behavior of hard rocks. The introduction of clump logic (Cho et al., 2007) into the PFC modeling has made it possible for us to better reproduce the brittleness characteristic of hard rocks, namely, the large difference between compressive strength and tensile strength. However, there is a problem in the PFC simulation with the clumped particle model, namely, when we simulate Brazilian tensile tests on hard rocks, the results do not fully express the rapid decrease in tensile stress after the peak stress. One reason for this problem is the existence of clumps that block the rapid propagation and the connection of the micro-cracks in the model by their interlocking effect. Focusing on the effect of clump configuration on the Brazilian tensile failure behavior of hard rocks, this paper carried out simulations by varying clump size and ball size. The experimental mechanical properties of Lac du Bonnet granite (Potyondy and Cundall, 2004) were targeted in the simulations. From the simulation results, we confirmed that brittleness can be controlled by changing the ratio of clump size to minimum ball size and that under a constant ratio of clump size to minimum ball size, the local peak stress does not change with the minimum ball size.

Original languageEnglish
Title of host publicationISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014
Editors Kaneko, Kodama, Shimizu
PublisherInternational Society for Rock Mechanics
Pages582-590
Number of pages9
ISBN (Electronic)9784907430030
Publication statusPublished - Jan 1 2014
Event8th Asian Rock Mechanics Symposium, ARMS 2014 - Sapporo, Japan
Duration: Oct 14 2014Oct 16 2014

Publication series

NameISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014

Other

Other8th Asian Rock Mechanics Symposium, ARMS 2014
CountryJapan
CitySapporo
Period10/14/1410/16/14

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All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

Cite this

Nakashima, S., Taguchi, K., Shimizu, N., & Funatsu, T. (2014). Effect of element configuration on Brazilian tensile failure by DEM. In Kaneko, Kodama, & Shimizu (Eds.), ISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014 (pp. 582-590). (ISRM International Symposium - 8th Asian Rock Mechanics Symposium, ARMS 2014). International Society for Rock Mechanics.