Substantiation of conditions of maintaining stability of haulage drifts during development of steep seams

Iordanov, Igor; Simonova, Yuliia; Novikova, Yuliia; Korol, Anton; Podkopayev, Yevgen; Kayun, Oleksiy

doi:10.15587/2706-5448.2020.206009

Cited by 2 publications

(3 citation statements)

References 4 publications

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“…Ensuring the haulage drifts stability during their entire operational life guarantees the normal operation of the transport and the required amount of air for ventilating the mining sites. In the work [5], it is proposed to use rolling-on chocks from wooden sleepers to protect the haulage drifts and ensure their operating state. The use of yielding wooden structures to protect mine workings will restrict the rocks displacement on the haulage drift contour, but for this it is necessary to take into account a change in the stiffness of protective structures along the mine working length.…”

Section: Analysis Of Literary Sourcesmentioning

confidence: 99%

“…Global experience and practice of mining the steep coal seams show that when protecting the zonal advance workings with coal pillars of limited sizes, about 50% of haulage drifts are in an unsatisfactory state [7]. Non-pillar schemes for mining the mining sites, in certain mining-and-geological conditions, do not fully ensure the operating state of the zonal advance workings adjacent to the stope face [4], [5]. All this allows to assert the expediency of conducting experimental research on the haulage drifts stability in coal mines developing steeply dipping seams.…”

Section: Analysis Of Literary Sourcesmentioning

confidence: 99%

“…Analysis of the mine workings state in the mines developing the steeply dipping coal seams indicates that about 50% of the haulage drifts length have sections that do not meet the performance requirements [4]. The unsatisfactory mine workings state and the repair work implementation in them negatively affects the stope face operation, worsening the conditions for mining site ventilation and reducing the safety level when conducting mining operations [5].…”

Section: Introductionmentioning

confidence: 99%

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Experimental research on the haulage drifts stability in steeply dipping seams

Iordanov¹,

Buleha²,

Bachurina³

et al. 2021

Min. miner. depos.

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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.

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Section: Analysis Of Literary Sourcesmentioning

confidence: 99%

Section: Analysis Of Literary Sourcesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental research on the haulage drifts stability in steeply dipping seams

Iordanov¹,

Buleha²,

Bachurina³

et al. 2021

Min. miner. depos.

Self Cite

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Modeling of Stability of Side Rocks in a Coal Masifwith Different Methods of Support the Workings

Dovhal¹

2021

LPPU

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Purpose of work. Determine the conditions of the side rocks stability in a coal massif with different ways of support coal-rock stratum to ensure safe working conditions for miners in the excavation areas of a coal mine with steep coal seams. To achieve this goal, laboratory studies were carried out on models of optical and equivalent materials. The modeling of the stability of side rocks in a coal-rock massif was carried out with the methods of support roadways with vertical timber setsand wooden crib supports: 4-point chock.On models made of optical materials in the analysis of the static field of the distribution of shear stresses in side rocks, the regularity of the change in hazardous manifestations of rock pressure, depending on the deformability of support structures, was recorded. On equivalent models of support structures, the deformation characteristics of experimental samples were determined and their effect on the integrity of the roof under the action of static loads was established. When using rigid support structures in the form of vertical timber sets made of wooden racks to protect sliding drifts, there is a deterioration in the stability of side rocks and destruction of the roof. When using flexible support structures in the form of wooden crib supports: 4-point chock, a smooth deflection of the roof and its integrity are observed. A decrease in the size of the stress concentration zone in the model of a coal-rock massif with workings after the compaction of flexible support structures located above the haul roadway, due to a change in their rigidity, when as a result of the convergence of side rocks, a smooth deflection is provided and the movement of the roof is limited. To ensure the stability of side rocks and development workings, as well as reduce the level of injuries of miners from landslides and collapses in the excavation areas of coal mines that develop steep seams, it is advisable to use flexible support structures, when using which, a smooth deflection of side rocks and their integrity in the mined-out area is ensured coal massif.

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Substantiation of conditions of maintaining stability of haulage drifts during development of steep seams

Cited by 2 publications

References 4 publications

Experimental research on the haulage drifts stability in steeply dipping seams

Experimental research on the haulage drifts stability in steeply dipping seams

Modeling of Stability of Side Rocks in a Coal Masifwith Different Methods of Support the Workings

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