PECULIARITIES OF THE IMPACT OF CONSECUTIVE PERIODIC BIAXIAL CYCLIC LOADING ON THE STRENGTH AND ACOUSTIC PROPERTIES OF LIMESTONE

This article presents the experimental findings to assess the consecutive series of cyclic impact in one and two directions of axial compression on the strength and acoustic properties of limestone samples collected in the Kasimov Field. The velocities of elastic longitudinal and transverse waves, acoustic quality factor (Q-factor), dynamic elasticity modulus, and strength were used as information-bearing parameters. The information-bearing parameters vary greatly at the range of 50—100 loading cycles, and then they normalize. Analysis of the strength's dependence on the number of cycles M indicates its decrease during the first 50 cycles of loading, whereby the strength normalizes as the M value rises. At that, the strength of samples exposed to impact in both directions was higher than that of the samples loaded in one direction. The obtained dependences of acoustic parameters on the number of cycles M are approximated by the exponential functions of y = a0 + a1exp(–x/a2). Recording the load and the sample longitudinal deformation helped calculate the variations of the differential modulus of deformation Ed. The behavior of the Ed curve at the uniaxial cyclic loading is distinguished by its smooth ascendancy and subsequent increment at a constant speed. The Ed growth rate at re-loading in the perpendicular direction is significantly lower than at the first loading direction. variations during the first loading range from 2 to 10%, and these variations are lower under biaxial loading, which are 1,5 to 2%. When these findings are applied in practice, the bior multi-axial cyclic loadings may be recommended for use where the goal is to retain the strength. In turn, the uniaxial loadings may be recommended where the fastest strength reduction is required.

 

Acknowledgements: The reported study was funded by RFBR according to the research project No 17-05-00570.

For citation: Voznesenskii A. S., Krasilov M. N., Kutkin Ya. O., Tavostin M. N. Peculiarities of the impact of consecutive periodic biaxial cyclic loading on the strength and acoustic properties of limestone. MIAB. Mining Inf. Anal. Bull. 2019;(10):117-130. [In Russ]. DOI: 10.25018/0236-1493-2019-10-0-117-130.

Keywords

Rocks, fatigue, strength, regularities, influence, cyclic, impact, acoustic, properties, deformation.

Issue number: 10
Year: 2019
ISBN: 0236-1493
UDK: 552.541:552.08
DOI: 10.25018/0236-1493-2019-10-0-117-130
Authors: Voznesenskii A. S., Krasilov M. N., Kutkin Ya. O., Tavostin M. N.

About authors: A.S. Voznesenskii (1), Dr. Sci. (Eng.), Professor, e-mail: al48@mail.ru, M.N. Krasilov (1), Graduate Student, Ya.O. Kutkin (1), Cand. Sci. (Eng.), Assistant Professor, M.N. Tavostin, Cand. Sci. (Eng.), Senior Researcher, LLC «Gasprom geotechnology», 123290, Moscow, Russia, 1) National University of Science and Technology «MISiS», 119049, Moscow, Russia. Corresponding author: A.S. Voznesenskii, e-mail: al48@mail.ru.

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