Operational recognition of geological and mineralogical varieties of rocks on the basis of ultrasonic measurements

V. Morkun, N. Morkun, V. Tron, I. Gaponenko, A. Gaponenko, O. Serdyuk
Received 15.06.2021, Revised 05.10.2021, Accepted 19.11.2021, Published 17.12.2021
Abstract

To increase the accuracy of ultrasonic logging to determine the physical-mechanical and chemical-mineralogical characteristics of rock based on the values of the velocity of longitudinal and transverse waves, the attenuation coefficient of ultrasound at fundamental frequency and higher harmonics, and the ratio of these parameters. The method of determining geological and mineralogical varieties of rocks based on the assessment of changes in the velocity of longitudinal and transverse bulk ultrasonic waves, the ratio of these values in the controlled envi ronment, and the parameter that characterizes the degree of nonlinearity of this process - the amount of ultrasound attenuation It was established that estimates of changes in the velocity of propagation of longitudinal and transverse bulk ultrasonic waves, the ratio of these values in the controlled medium, as well as the parameter characterizing the degree of nonlinearity of this process - the amount of ultrasound attenuation can be used to identify geological and mineralogical varieties of iron ore and higher harmonics. The results of the research showed that the most effective method for solving this problem was the Fuzzy C-Shape method, which identified geological and mineralogical varieties of iron ore with a probability of 0.91%. In rocks, the speed of propagation of elastic waves varies widely and depends on physical properties, structure, texture, condition and other internal and external factors. The velocities of longitudinal and transverse ultrasonic waves in rocks are determined by their elastic characteristics: the velocity of longitudinal waves increases with increasing Young's modulus and Poisson's ratio. The speed of propagation of elastic waves in rocks is determined by their elastic properties and density. This speed is almost independent of the wavelength, which allows you to use for research waves with any frequency. The proposed method based on the results of ultrasonic measurements of rock characteristics and fuzzy inference allows to identify with a high degree of accuracy mineralogical and technological varieties of ore in the mountain massif in the initial stage of the technological process of its extraction and processing, compare them. ensures the achievement of the set indica tors of mining and processing redistribution, taking into account the requirements of environmental protection and energy efficiency. 

Keywords:
geological and mineralogical varieties; rock; ultrasonic measurements; wells’ logging

Retrieved from Vol. 19, No. 2, 2021

Pages 3–9

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Morkun, V., Morkun, N., Tron, V., Gaponenko, I., Gaponenko, A., & Serdyuk, O. (2021). Operational recognition of geological and mineralogical varieties of rocks on the basis of ultrasonic measurements. Journal of Kryvyi Rih National University, 19(2), 3-9. https://doi.org/10.31721/2306-5451-2021-1-53-3-9
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