Forecasting Collapse and Monitoring of the Main Roof Current State in Working Faces of Coal Mines with Shallow Seams


Annotation:

Main roof state monitoring and assessment of the roof hanging influence on the coal seam in working face of the coal mines with medium thickness seams with dip angle varying from 0 to 35° using a long-pillar development system along strike and uprising with roof control by complete collapse and abandonment of inter-main pillars a technically difficult task and currently unsolvable by tools.
The main roof, composed of fine-grained gray sandstones, coarse-grained siltstones or interbedding of siltstones with sandstones, with average strengths of layers of about 30–40 MPa, is predicted to be moderately collapsing, and more than 50 MPa as difficult to collapse over a large area of coal seam spread.
Hanging of the main roof with subsequent uncontrolled collapse can lead to the displacement of methane accumulating in the waste space into the face and provoke an explosion, fire or other emergency.
It should be noted that the urgency of the problem is due to the fact that when large masses of the roof collapse during the lava retreat, an instantaneous release of large volumes of air from the collapsed space, accompanied by the release of methane and coal dust, occurs, which has repeatedly led to accidents. The article discusses the prediction of collapse and main roof current state monitoring in the working faces of coal mines with a shallow bedding by seismic method.
Using «Mikon-GEO» as a seismic prediction system in coal mines and pits allows to make risks manageable and accounted.

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DOI: 10.24000/0409-2961-2021-4-13-18
Year: 2021
Issue num: April
Keywords : Mikon-GEO roof hanging control of the pitch of the roof landing seismic method monitoring of the condition of the main roof forecast of roof collapse
Authors:
  • Nedzelskiy A.I.
    Nedzelskiy A.I.
    Senior Specialist LLC INGORTECH, Yekaterinburg, Russia Engineer, Candidate Ural State Mining University, Yekaterinburg, Russia
  • Shnayder I.V.
    Shnayder I.V.
    ivan-shnajder@yandex.ru, Senior Specialist LLC INGORTECH, Yekaterinburg, Russia Engineer, Candidate Ural State Mining University, Yekaterinburg, Russia
  • Lapin E.S.
    Lapin E.S.
    Dr. Sci. (Eng.), Prof. Ural State Mining University, Yekaterinburg, Russia