Rock-burst simulations with 2D-DDA: Preliminary results

Ravit Zelig, Yossef H. Hatzor, Xia Ting Feng

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

1 Scopus citations

Abstract

We investigate the mechanisms for rock-burst using the numerical Discontinuous Deformation Analysis (DDA) method. Using recently developed non reflective boundary and excavation sequence modeling capabilities we are now able to model dynamic deformation in high in-situ stress environments more accurately than before. First we perform verifications of P-wave propagation through a one-dimensional elastic bar and confirm DDA accuracy provided that the block length with respect to wave length is properly conditioned. We then test a newly developed radial P-wave propagation module to emulate an underground blast. We study two possible rock burst generation mechanisms: 1) due to strain relaxation as response to opening in high in situ stress environment, and 2) due to nearby blasting. A very strong relation between the initial stress and the velocity and acceleration of the ejected key blocks following the removal of the tunnel section is reported. We also find that the influence of blasting on rock burst phenomena is strongly related to the initial in situ stress level. We conclude that under relatively low in situ stress environments nearby blasting may indeed ejection of originally stable key blocks. However, under high in situ stress conditions strain relaxation poses a much greater rock-burst risk.

Original languageEnglish
Title of host publication49th US Rock Mechanics / Geomechanics Symposium 2015
PublisherAmerican Rock Mechanics Association (ARMA)
Pages863-872
Number of pages10
Volume2
ISBN (Electronic)9781510810518
StatePublished - 1 Jan 2015
Event49th US Rock Mechanics / Geomechanics Symposium - San Francisco, United States
Duration: 29 Jun 20151 Jul 2015

Conference

Conference49th US Rock Mechanics / Geomechanics Symposium
Country/TerritoryUnited States
CitySan Francisco
Period29/06/151/07/15

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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