THE EFFECT OF LIMESTONE POROSITY ON THE VELOCITY OF P- AND S-WAVES UNDER MECHANICAL AND THERMAL LOADING

• Published in: Journal of mining science 2020-09, Vol.56 (5), p.695-705
• Main Authors: Nikolenko, P. V., Shkuratnik, V. L., Chepur, M. D.
• Format: Article
• Language: English
• Subjects: Acoustic attenuation; Analysis; Axial loads; Control stability; Earth and Environmental Science; Earth Sciences; Elastic waves; Geomechanics; Geophysics/Geodesy; Geotechnical Engineering & Applied Earth Sciences; High temperature; Limestone; Mechanical properties; Mechanical tests; Mineral Resources; P waves; Porosity; Rocks; S waves; Sensitivity enhancement; Spectral analysis; Spectral sensitivity; Spectrum analysis; Strain; Stress measurement; Structural stability; Temperature; Ultrasonic attenuation; Underground structures
• ISSN: 1062-7391; 1573-8736
• DOI: 10.1134/S1062739120057019

The thermal and mechanical tests of different porosity limestone show that an increase in the axial load results in the higher velocities of elastic waves while elevation of temperature decreases them. Higher temperatures act to raise velocities of P- and S-waves with increasing mechanical load, which enhances acoustic strain-sensitivity of rock. The spectral analysis of the recorded signals shows that higher temperature shifts spectrum maxima to lower frequency region. It is found that size of pores has influence on attenuation frequency of ultrasonic signals. The authors describe new approaches to acoustic strain-sensitivity control in rocks and to stress measurement reliability enhancement toward stability of underground structures.