International Academic Journal of Science and Engineering

  • ISSN 2454-3896

Application of Vibration in Longwall Top Coal Caving Method

Alireza Jabinpour,Alireza Yarahmadi Bafghi and Javad Gholamnejad

Abstract: Coal is an alternative replacement for oil that has an exhausted prospective to produce energy. The Most of coal seams were located in high depth below surface that leads to use underground mining methods. About half of all coal seams are thick seams that should be exploited by longwall top coal caving method. In order to have a good condition in this method, coal seam should have weak or near weak strength. On the other hand, this strength condition always is not available so that coal seam was break to large blocks and creates a stable arch. To exceed to this situation, a vibration system that located on the top of shield was invented. This system can produce a vibration with low frequency and high power that causes a reduction in cohesion and friction angle, and hence the stable arch was simply fall down. Coal recovery is increased and dilution is decreased. Some studies reported that coal recovery was increased about 5 percent after using vibration. In addition, this system can reduce risks of air blast and rock burst, significantly

Keywords: Coal seams, longwall, top coal caving, vibration system, recovery

Page: 9-16

Volume 1, Issue 2, 2014