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Thermodynamic aspect of rock destruction

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Category: Content №1 2020

Last Updated on 09 April 2020

Published on 10 March 2020

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Authors:

V.А.Mashchenko, Cand. Sc. (Phys.-Math.), Assoc. Prof., orcid.org/0000-0001-6968-762X, Odesa State Academy of Regulation and Quality, Odesa, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

О.Ye.Khomenko, Dr. Sc. (Tech.), Prof., orcid.org/0000-0001-7498-8494, Dnipro University of Technology, Dnipro, Ukraine, e‑mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

V.P.Kvasnikov, Dr. Sc. (Tech.), Prof., orcid.org/0000-0002-6525-9721, National Aviation University, Kyiv, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2020, (1):25-30
https://doi.org/10.33271/nvngu/2020-1/025

 повний текст / full article

Abstract:

Purpose. To evaluate the change in free energy in the transition from the nonequilibrium state of the rock to the equilibrium. This process implements the process of dynamic brittle fracture on the structural defects of the rock as a micro-inhomogeneous medium.

Methodology. It included conducting, within the framework of statistical thermodynamics, a series of experimental studies on the density and velocity of propagation of longitudinal and transverse acoustic waves in sandstone samples under different loading conditions.

Findings. According to the experimental data on the velocities of propagation of longitudinal and transverse acoustic waves for a number of sandstones at different loading modes, the values of mechanical and thermodynamic parameters characterizing the state of rocks are established. A comparative analysis of the frequency dependences of free energy on the value of the Poisson ratio is carried out.

Originality. A model of a thermodynamic system is proposed that describes the energy-activated process of transition of rock from a nonequilibrium state to equilibrium during external perturbation by surface acoustic waves. The possibility of estimating the degree of slow dynamic destruction by the Debye temperature is revealed. The mechanism of dissipation of internal energy on structural defects of the system, with the transition of its part into thermal motion of structural elements, is substantiated.

Practical value. The technique for investigation of thermodynamic state of non-ideally elastic rocks by methods of nondestructive testing is developed. The correlation between the mechanical parameters of the rock and the characteristics of the process of its transition from the nonequilibrium state to the equilibrium is established.

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