P-WAVE ATTENUATION IN CREEPING ROCK AND SYSTEM-IDENTIFICATION

Citation
O. Moustachi et Jf. Thimus, P-WAVE ATTENUATION IN CREEPING ROCK AND SYSTEM-IDENTIFICATION, Rock mechanics and rock engineering, 30(4), 1997, pp. 169-180
Citations number
14
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Geosciences, Interdisciplinary","Engineering, Civil
ISSN journal
0723-2632
Volume
30
Issue
4
Year of publication
1997
Pages
169 - 180
Database
ISI
SICI code
0723-2632(1997)30:4<169:PAICRA>2.0.ZU;2-4
Abstract
The aim of this paper is to contribute to the evaluation of rock crack ing using ultrasonic wave propagation. The rock specimens (siltstone s ampled from a coal mine at a depth of 820 meters in Belgium) are subje cted to incremental creep. The study of the rock transfer function sho ws P-wave attenuation in the direction of loading as a function of str ess and time during the test: this attenuation becomes more significan t at the stage at which the rock dilates. It is obvious from the speci men dimensions that the signal is affected by reflection phenomena. So , we have modelled the output signals with a model containing reflecti ons. The simulations obtained from the model and input signal are very conclusive and the model validation is satisfying.