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MODELING AND CLASSIFICATION OF ROOF ROCK BEHAVIOR IN COAL MINES CONSIDERING CONDITIONS OF EAST ALBORZ COAL MINES
Abstract
Many researches have been carried out in field of “Roof rock behavior in coal mines", most of them concentrated on mines devel opment networks; but a less attention have been paid to assessment and classification of roof strata behavior over long wall coal mining panels. In this paper, It has been a ttentioned to roof strata behavior over long wall coal mining panels in East Alborz coal mines. Intens ive field work and laboratory analyses that discuses the influence of various parameters on roof rock behavior of the stratified rock. Most effective of them are: uniaxial compressive strength (UCS), tensile strength, moisture sensitivity , joints, bedding thickness, orientation and dips of discontinuities relevant to face and surface of working area. However, based on the proposed system, the roof rock over a long wall panel is assigned a rating from 15.5 to 100, with a higher rating corresponding more stable roof. According to this rating system, a roof can be classified into five modes: extremely unsta ble, highly unstable, medium stable, good stable, highly stable. Th e obtained results can be used by mine designer.
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References12
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