Research into rock mass geomechanical situation in the zone of stope operations influence at the 10^th Anniversary of Kazakhstan’s Independence mine

Azamat Matayev¹, Ainash Kainazarova¹, Ibatolla Arystan¹, Yerkebulan Abeuov¹, Arman Kainazarov², Makhmed Baizbayev¹ Vladimir Demin¹, Muratbek Sultanov³

¹Karaganda Technical University, Karaganda, 10009, Kazakhstan

²Ekibastuz Engineering and Technical Institute named after Academician K. Satpayev, Ekibastuz, 10008, Kazakhstan

³Aktobe Regional University named after K. Zhubanov, Aktobe, 10004, Kazakhstan

Min. miner. depos. 2021, 15(1):103-111

https://doi.org/10.33271/mining15.01.103

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      ABSTRACT

      Purpose. Predicting the stress-strain state (SSS) of the rock mass in the zone of stope operations influence using the self-caving mining system and the calculation of the load-bearing capacity of mine workings support at the 10^th Anniversary of Kazakhstan’s Independence mine.

      Methods. An engineering-geological data complex of the host rocks properties has been analyzed. Numerical modelling of the rock mass stress-strain state and the calculation of the load-bearing capacity of the support types used at the mine have been performed with the help of the RS2 software. This program, based on the Finite Element Method in a two-dimensional formulation, makes it possible to take into account a significant number of factors influencing the mass state. The Hoek-Brown model with its distinctive advantage of nonlinearity is used as a model for the mass behaviour.

      Findings. The values of the main stresses and load on the support have been obtained. According to the numerical analysis results of the rock mass stress-strain state at a depth of 900 m (horizon -480 m), the principal stresses are close to hydrosta-tic ones σ₁ = σ₂ = σ_z = 24.8 MPa. Predicting assessment of mine workings stability margin is performed before and after stope operations. Based on its results, it can be assumed that the stability margin of the mine workings driven in the stope zone is below the minimum permissible, therefore, caving and an increase in the load on the support are possible. Abutment pressure on mine workings support at a mining depth of 900 m (-480 m) has been calculated. The parameters of support in mine workings driven at the horizon -480 m have been calculated.

      Originality.The nature and peculiarities of patterns of the stress-strain state formation within the boundaries of various stope operations influence in blocks 20-28 at the horizon -480 m have been determined. The quantitative assessment of the values of loads on the support of haulage cross-cuts of the horizon mining is given.

      Practical implications. The research results can be used for creating a geomechanical model of the field and to design stable parameters of mine workings support.

      Keywords: stress-strain state, principal stresses, support, mine, ore, rock mass

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