Abstract
The goal of this research is to develop a method for calculating the strength of cylindrical rock specimens under axial failure. This will allow for the management of the stress-strain state of rock masses, which is an important issue for many mining companies. To achieve this goal, analytical modeling of the process of failure of cylindrical rock specimens under axial failure was carried out. This was done using experimental values of four indicators of rock properties: shear strength, coefficients of internal and external friction, and elasticity modulus. The results of this research allow for the determination of the ultimate strength and residual strength of cylindrical rock specimens using the four property indicators. These indicators can be experimentally determined using simple methods in laboratory conditions of mining companies. The scientific novelty of this research lies in the fact that analytical modeling of the process of failure of cylindrical rock specimens under axial failure was conducted for the first time, taking into account internal and external friction. This allowed for new results to be obtained and provided a basis for the development of new methods for managing the state of rock masses. The practical significance of this research lies in the fact that the proposed method allows for the determination of the ultimate and residual strength of rock specimens using four property indicators. These indicators can be experimentally determined in mining company laboratories, making the calculation results applicable for the management of the state of rock masses and the efficient destruction of rocks during disintegration. Thus, this method has significant practical significance for the mining industry. A method for calculating the strength of cylindrical specimens under longitudinal failure mode has been developed. The average convergence of calculated strength values with fс = 0.5 to experimental data is 83.4%, which corresponds to a good level of reliability for rock materials. It has been shown that the self-organization of longitudinal failure mode in cylindrical rock specimens occurs in accordance with Coulomb's criterion of maximum effective shear stress, which has been improved to account for contact friction.
Publisher
National Academy of Sciences of Ukraine (Co. LTD Ukrinformnauka) (Publications)
Reference15 articles.
1. 1. Nesmashnyiy, E.A. and Bolotnikov, A.V. (2017), "Determining the strength of rock formations using modern equipment on the example of the "Bolshaya Glivatka" deposit", Metallurgicheskaya i gornorudnaya promyishlennost, Vol. 3, pp. 82-87.
2. 2. Bingxiang, H. and Jiangwei, L. (2013), "The Effect of Loading Rate on the Behavior of Samples Composed of Coal and Rock", International Journal of Rock Mechanics and Mining Sciences, Vol. 61, pp. 23-30. https://doi.org/10.1016/j.ijrmms.2013.02.002
3. 3. Meyer, J.P. and Labuz, J.F. (2013), "Linear Failure Criteria with Three Principal Stresses", International Journal of Rock Mechanics and Mining Sciences, Vol. 60, pp. 180-187. https://doi.org/10.1016/j.ijrmms.2012.12.040
4. 4. Tarasov, B. and Potvin, Yv. (2013), "Universal Criteria for Rock Brittleness Estimation under Triaxial Compression", International Journal of Rock Mechanics and Mining Sciences, pp. 57-69. https://doi.org/10.1016/j.ijrmms.2012.12.011
5. 5. Chanyishev, A.I. (2010), Zapredelnoe deformirovanie materialov pri antiploskoy deformatsii i ego uchYot v zadache o rasprostranenii pryamolineynoy polubeskonechnoy treschinyi. Deformirovanie i razrushenie materialov s defektami i dinamicheskie yavleniya v gornyih porodah i vyirabotkah[Excessive deformation of materials under anti-plane strain and its accounting in the problem of propagation of a straight semi-infinite crack. Deformation and failure of materials with defects and dynamic phenomena in rocks and mines], Ukraine Taurida National V.I. Vernadsky University, Simferopol, Ukraine.