HOW METHODS OF SUPPORTING THE LONGWALL AND GALLERY ENDS IMPACT ON CHARACTER OF THE PREPARATORY ROADWAY DEFORMATION

Details

Parent Category: Geo-Technical Mechanics, 2015

Category: Geo-Technical Mechanics, 2015, Issue 120

UDC622.268.13: 622.268.7

Authors:

Averkin D.I., M.S. (Tech.)

(«Minova Ukraine» LTD)

Abstract:

The work presents experimental findings on how different methods used for supporting the longwall and gallery ends impact on the gallery stability and which aspects could improve the support strength in the preparatory roadways. Effectiveness of the yielding (quarry-stone packs) and rigid (concrete packs) supporting structures were compared while mining the seam т₃ in the Chaikino Mine of the Makeevugol Mining Company. Differentiated dependences were identified between the floor and roof displacements in the preparatory roadway and distance to the stope.

It has been proved that in case of the quarry-stone packs, the stresses essentially spread along the width of the overworked floor in the coal seam and reduce the floor swelling in the preparatory roadway, but the roof subsidence is intensified due to the great yielding of the supporting structure. Besides, the quarry-stone pack doesn’t function as a roof-breaking support and, consequently, load on the arch support increases and displacement of the preparatory roadway contour remains unstable for a long period of time.

At the same time, when the longwall end is supported with the concrete pillars, the roadway roof subsidence is essentially reduced thanks to the rigid supporting structure. But, as the narrow and more rigid sector of the supporting structure (the concrete pillars) is located from the side of the preparatory roadway, the stresses are concentrated in the overworked floor of the coal seam resulting in intensive floor swelling. Nevertheless, in case of supporting the longway end with the concrete pillars, total vertical convergence of the gallery is reduced by 15-20% in average if compare with the quarry-stone packs.

Thus, it is necessary to design a fundamentally new method for building rigid structures for supporting the longwall and gallery ends which would differ by its simplicity and would allow building the pack right up to the overworked roof in the coal seam with minimal distance (not more than 3-4 m) to the longway face.

Keywords:

supporting of the preparatory roadways, rib-side pack.

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About the author:

Averkin Dmitry Ivanovich, Master of Science, Deputy Director of «Minova Ukraine» LTD, Donetsk, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

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