Effect of main rock mass parameters on initiation of tensile strain zones around openings at a depth greater than 1 km

The article presents an estimate of the effect exerted by the physical and mechanical properties of rocks, such as elasticity modulus, Poisson’s ratio, the quantitative indicator of rock mass (Q-index) and the mining depth on the initiation of tensile strain zones around underground openings. There are three calculation scenarios in terms of directions of maximum stresses: along the opening axis; in perpendicular to the opening axis; at an angle of 45° to the opening axis. The stress–strain analysis of enclosing rock mass around development headings was carried out in the Map3D environment. The quantitative analysis results are used in adjustment of the model for a full period of heading and maintenance of the headings. The data on tensile strain zones are included in rough determination of the distance from the heading roof and side to the boundary of the microstrain zones with the values =350 (zone of probable rock mass failure). The analysis of the main rock mass parameters on the tensile strain zone in the three scenarios shows that the values of the principal stresses and the quantitative indicator (Q-index) with the increasing depth of mining are more influential than the modulus of elasticity and Poisson’s ratio of rocks.

Nguyen Van Minh, Khazhyylai C. V., Umarov A. R., Yanbekov A. M. Effect of main rock mass parameters on initiation of tensile strain zones around openings at a depth greater than 1 km. MIAB. Mining Inf. Anal. Bull. 2021;(8):104-113. [In Russ]. DOI: 10.25018/0236_1493_2021_8_0_104.

Nguyen Van Minh, Graduate Student, e-mail: minhnv@utt.edu.vn, Mining Institute, National University of Science and Technology «MISiS», 119049, Moscow, Russia,
C.V. Khazhyylai¹, Laboratory Assistant, e-mail: chod.872198@mail.ru,
A.R. Umarov¹, Laboratory Assistant, e-mail: flek1231998@mail.ru,
A.M. Yanbekov¹, Laboratory Assistant, e-mail: yanbekov17@mail.ru,
¹ Research Center for Applied Geomechanics and Convergent Technologies in Mining, Mining Institute, National University of Science and Technology «MISiS», 119049, Moscow, Russia.

Nguyen Van Minh, e-mail: minhnv@utt.edu.vn, A.R. Umarov, e-mail: flek1231998@mail.ru.

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