Experimental studies into temperature and pressure effect on the quality and fracture of rock samples

Authors: Nikolenko P. V.

Quality of rocks can be affected by many factors. The critical factors are the temperature and stress state. One of the approaches to the in-situ estimation of rock quality is investigation of acoustic properties of rocks, in particular, measurement of Pand S-wave velocities. This article studies dynamics of damage accumulation in limestone samples of different porosity under the action of varied temperatures and pressures. Computer-assisted modeling proves detectability of moment of thermal equilibrium between the faces and center of a sample by flattening of the P-wave velocity curve. The modeling results are compared with the real experimental data. The laboratory-scale tests on a specially designed installation have found that the increasing temperature causes a more intense growth in the amount of damage in porous limestone samples than in less-porous limestone. Alternatively, the increase in the axial pressure reduces intensity of damage process. With increasing axial pressure to 9 MPa, the increment in the amount of damages is reduced in massive and porous limestone by 24% and 48%, respectively, at the temperature being risen from 20 to 100 °С.

Keywords: rock, damage, temperature, pressure, elastic waves, modeling.
For citation:

Nikolenko P. V. Experimental studies into temperature and pressure effect on the quality and fracture of rock samples. MIAB. Mining Inf. Anal. Bull. 2020;(11):70-78. [In Russ]. DOI: 10.25018/0236-1493-2020-11-0-70-78.

Acknowledgements:

The study was supported by the Russian Foundation for Basic Research, Grant No. 19-05-00152.

Issue number: 11
Year: 2020
Page number: 70-78
ISBN: 0236-1493
UDK: 622.02:539.2
DOI: 10.25018/0236-1493-2020-11-0-70-78
Article receipt date: 12.08.2020
Date of review receipt: 14.09.2020
Date of the editorial board′s decision on the article′s publishing: 10.10.2020
About authors:

P.V. Nikolenko, Cand. Sci. (Eng.), Assistant Professor, e-mail: p.nikolenko@misis.ru, National University of Science and Technology «MISiS», 119049, Moscow, Russia.

 

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