Prediction of face advance rate and determination of the operation efficiency in retreat longwall mining panel using rock engineering system

International Journal of Coal Science & Technology

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[1] 0000 0000 9826 9569, grid.412503.1, Mining Engineering Department, Shahid Bahonar University of Kerman, Kerman, Iran;0000 0000 9826 9569, grid.412503.1, Mining and Petroleum Engineering Department, Shahid Bahonar University of Kerman, Kerman, Iran;

关键词: Face advance rate;    Rock engineering systems;    Operation efficiency;    Longwall mining;    Parvadeh-I coal mine;   

DOI  :  10.1007/s40789-019-0245-6

来源: publisher

【 摘 要 】

A new approach for prediction of face advance rete (FAR) prior to mining operation and determination of the operation efficiency after mining operation in retreat longwall mining panel is presented based upon the concepts of rock engineering system (RES). For this purpose, six longwall panels considered in Parvadeh-I coal mine. Seven major effective parameters on FAR was selected including coal mine roof rating, gas propagation, safety factor of longwall face, ratio of joint spacing to cutting depth at longwall face, longwall face inclination, panel width, floor rock mass rating. To performance evaluation of the presented model, the relationship between the average vulnerability indexes of advance operation with FAR was determined in considered panels with coefficient of determination (R2) equal to 0.884 that indicate relatively acceptable correlation and compatibility. Investigations of the research indicated that it is possible to determine the actual operation efficiency under fair conditions by a RES-based model. The inevitable reduction of FAR for each longwall panel was determined by presented model that the difference amount between the maximum possible practical face advance rate (FARmpp) and recorded actual face advance rate (FARa) indicate the operation efficiency. Applied approach in this paper can be used to prediction of FAR in retreat longwall mining panel for same conditions that can have many benefits, including better and more accurate planning for the sales market and mine operation. Also, presented method in this paper can be applied as a useful tool to determination of actual operation efficiency for other sections and extraction methods in coal mines.

【 授权许可】

CC BY