ارايه يك سيستم رده بندي جديد به منظور بررسي رفتار سنگ سقف در معادن زغال سنگ

MODELING AND CLASSIFICATION OF ROOF BEHAVIOR IN COAL MINES

Many researches have been carried out in field of "Roof rock behavior in coal mines most of them concentrated on mines development networks; but a less attention have been paid to assessment and classification of roof strata behavior over longwall coal mining panels. However various parameters influence on the deformability behavior of the stratified rock mass. This paper discusses the most effective parameters and the degree of influence of each of them on the stability behavior of coal mines roof rock. Based on the assessment, six parameters were recognized witch relevant to rock mass including uniaxial compressive strength (UCS), tensile strength, moisture sensitivity, joints, bedding thickness and orientation and dips of discontinuities relevant to face and surface of working area. In the proposed system, the roof rock over a longwall panel is assigned a rating from 15.5 to 100, with a higher rating corresponding more stable roof Based on this rating system, a roof maybe classified into five modes: extremely unstable, highly unstable, Medium stable, good stable, highly stable.