Coal is one of the essential energy sources, found abundantly within the earth's crust. Most coal mines worldwide, particularly in Afghanistan, are extracted using underground mining method. In order to extract coal mines through underground mining, well-reasoned and technical plans that answer all engineering and safety issues must be arranged. Extraction of coal layers underground causes various convulsions in the roof and floor of coal layers. The number of convulsions and its functioning depends on a series of different geological and technical factors. Therefore, in this research, the effective factors on how mine pressure works during underground coal mining have been researched and investigated using the library method, and later 16 effective factors have been selected for the occurrence of mine pressure. In order to determine the effect of these factors on how mine pressure works, a questionnaire was prepared and distributed to 32 university professors and professional engineers engaged in engineering in the mining sector. The results of these questionnaires show that all the selected factors have an important effect on the performance of mine pressure, including the type of roof rock, the direction of the sealing systems and the nature of the extraction pits have a great effect on the performance of the mine pressure during the underground extraction of coal mines.
Read full abstract