Relation between Kaiser effect levels and pre-stresses applied in the laboratory

TUNCAY E., ULUSAY R.

INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES, cilt.45, sa.4, ss.524-537, 2008 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 45 Sayı: 4
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1016/j.ijrmms.2007.07.013
  • Dergi Adı: INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.524-537
  • Anahtar Kelimeler: acoustic emission (AE), Kaiser effect (KE), pre-stress, EL-TENIENTE MINE, PROPAGATION THRESHOLDS, INITIATION
  • Hacettepe Üniversitesi Adresli: Evet

Özet

This study aims to investigate the relation between the Kaiser effect ( KE) levels and pre-stresses applied to rock samples in laboratory. For the purpose, a number of test specimens were obtained from different types of rock and a mortar block. Deformation and crack propagation stages were identified for each sample group. Based on the thresholds of these stages, the specimens were subjected to selected pre-stresses under uniaxial and axisymetric triaxial loading under laboratory conditions. Following the laboratory preloadings, acoustic emission ( AE) experiments were carried out on the specimens under uniaxial loading conditions to determine the KE levels. The comparisons made between the laboratory pre-stresses and the KE levels suggest that the KE level is not equal to one of the pre-stress values or their differences, and should be related to combined effect of axial and confined pre-stresses, and some rock dependent characteristics. (C) 2007 Elsevier Ltd. All rights reserved.