Experimental research on the haulage drifts stability in steeply dipping seams

Ihor Iordanov¹, Ihor Buleha², Yaroslava Bachurina¹, Hennadii Boichenko³, Vitaliy Dovgal⁴, Oleksiy Kayun², Olha Kohtieva¹, Yevgen Podkopayev¹

¹Donetsk National Technical University, Pokrovsk, 85300, Ukraine

²LLC “MC Elteko”, Kostiantynivka, 85103, Ukraine

³LLC “Sviato-Pokrovska #3 Mine”, Pokrovsk, 85300, Ukraine

⁴State Property Fund of Ukraine, Kyiv, 01133, Ukraine

Min. miner. depos. 2021, 15(4):56-67

https://doi.org/10.33271/mining15.04.056

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      ABSTRACT

      Purpose. Substantiation of the conditions for haulage drifts stability using different protection methods in steeply dipping seams based on a set of experimental studies.

      Methods. To achieve the purpose set, mine instrumental observations have been performed to study the rock pressure manifestations in zonal advance workings adjacent to the stope face on the haulage horizon. The conditions for their maintenance, within the mining site, are assessed by the side rocks convergence value on the drift contour and the change in the cross-sectional area, taking into account the deformation properties of the protective structures.

      Findings. It is recorded that in the zone of the stope works influence, in the most difficult conditions, haulage drifts are maintained, when coal pillars or clumps of prop stays are used for their protection. It has been determined that a decrease in the section of such mine workings up to 50% is the result of the protective structures destruction. When protecting the hau-lage drifts with the rolling-on chocks, a decrease in the mine working section up to 30% occurs in the process of the protective structures compression. It has been revealed that deformation of coal pillars or clumps of prop stays up to 10-20% leads to a loss of their stability, and an increase to 60% leads to a complete loss of their load-bearing capacity, intensification of rock displacements on the mine working contour and deterioration of its stability. It has been determined that in the process of deformation of the rolling-on chocks from sleepers by 20-60%, they are compressed without loss of load-bearing capacity, which ensures a smooth deflection of the overhanging stratum and restriction of rock displacements on the haulage drift contour.

      Originality. To study the deformation characteristics of protective structures above the drift, the function of the increment is used of side rock displacements on the haulage drift contour along the mining site length dependent on the relative deformations of protective structures, which makes it possible to assess the real dynamics of the process.

      Practical implications. When mining steep coal seams, using the specificity of geomechanical processes, which are manifested in an anisotropic coal-rock mass during unloading, satisfactory mine workings stability can be ensured by changing the deformation properties of protective structures above the drift.

      Keywords: rock pressure, drift, maintenance of mine workings, pillar, chocks, protective structures, rocks, coal-rock mass

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