DOI: 10.11799/ce201710004
Reasonable roadway position determination in steeply-inclined horizontal sublevel top-coal caving mining
WEI Wei-jie
YANG Sheng-li
LI Liang-hui
ZHANG Jin-wang
Abstract：Aiming at the low top-coal recovery rate of steeply-inclined horizontal sublevel top-coal caving, we utilized PFC2D to simulate the drawing process of top coal under the different floor roadway position. The simulation results show that the residual coal was mainly concentrated in the roof, floor and middle of the working face after the top coal drawing. When floor distance x≥2m, the morphology change of residual coal is unobvious. The top-coal recovery rate of 1# support is negatively correlated with top - coal recovery rate of the whole working face. The top - coal recovery rate increases in parabolic form over time in this simulation, and from the fitting curve, when x=4. 75m, the model has the highest top-coal recovery rate. Considering the top-coal recovery rate and rock roadway drivage rate, it is recommended to set the floor roadway at the position where x=2m, and the top coal recovery rate is about 85%.
Keywords：steeply - inclined horizontal sublevelLTCCroadway positiontop - coal recovery rateresidual coal morphology
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 16-19 )