Study of Strength Reduction in Natural Stone under Repeated Non-Destructive Dynamic Loading
Valentyn Korobiichuk1, Sergii Iskov1, Vasyl Mamrai1,2, Volodymyr Shamrai1, Dmytro Bilobrov1
1Zhytomyr Polytechnic State University, 10005 Zhytomyr, Ukraine; E-mail: korobiichykv@gmail.com, serga.iskov@ztu.edu.ua, vmamray@ztu.edu.ua, kgt_shvi@ztu.edu.ua, dimabelobrov86@gmail.com
2 Kütahya Dumlupınar University, 43100 Kütahya; E-mail: vmamray@gmail.com
Corresponding author: korobiichykv@gmail.com
ABSTRACT. This paper investigates the reduction of strength in natural stone under repeated non-destructive dynamic loading, which is essential for assessing the suitability of deposits for selective extraction of block stone in crushed stone quarries. A laboratory testing methodology is proposed based on repeated impacts of a spherical striker on stone samples, simulating the development of tensile stresses and accumulation of microcracks in the rock mass. Numerical modelling using Ansys AUTODYN was applied to establish relationships between the impact kinetic energy and induced tensile stresses. Experimental studies were carried out on granite, gabbro, and labradorite samples from more than ten deposits in Ukraine. Strength degradation was evaluated using an ultrasonic method by measuring the propagation velocity of surface waves after each loading cycle. The results indicate that most rocks fail when their strength decreases by 11% to 41.5%. Based on the obtained data, natural stone was classified into three groups according to resistance to repeated dynamic loading: high, medium, and low durability. It was found that fatigue strength is significantly influenced by quartz content and rock structure. Coarse-grained rocks and those with a high content of accessory minerals exhibit lower resistance to cyclic loading. The practical significance of the study lies in predicting disturbed zones within quarry rock masses, which enables optimisation of block stone extraction.
Key words: natural stone, dynamic loading, fatigue strength, ultrasonic testing, selective extraction.
DOI: https://doi.org/10.58903/MPIG2660
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