Comprehensive dust removal technology for rapid tunneling in semi-coal rock roadway
The dust concentration is high during the rapid tunneling process of underground semi-coal rock roadway in the Hanjiawan coal mine,severely affecting the physical health of the workers and hindering the improvement of high productivi-ty and efficiency.Through analyzing the dust removal capability level in semi-coal rock tunneling,we find that the dust parti-cles in the tunneling face are fine and mostly rock dust,and the existing ventilation dust removal equipment cannot remove the dust in time.By optimizing the dust removal equipment and adopting the comprehensive dust removal technology of long-pressurization and short-extraction,numerical simulation analysis shows that the dust removal efficiency is high and can fur-ther reduce the dust concentration.The dust concentration at the tunneling face is reduced to below 5 mg/m3,which is satis-factory for the mine safety requirement.The technology lays a solid foundation for improving the quality of tunneling work and the safety of construction environment in tunneling face,and has significant economic and social benefits.
semi-coal rock roadwaylong pressure short extractionnumerical simulationcomprehensive dust removal
万方数据
维普
