Rapid Excavation Research of Half Coal Rock Lane in Liu-wan Mine

摘要

In order to solve the question of excess or under excavation, poorly forming around the lane, low rate of excavation caused by less drilling, arbitrarily drilling, non-standard charging, unreasonable initiation network in the construction process of half coal rock lane in Liu-wan mine. According to coal and rock conditions at the scene and through theoretical calculations and engineering analogy, made a scientific and rational borehole layout and correct initiation network, strengthened temporary support and changed operation modes. The driving rate of the single circulation was improved from 1.6m to max.2.75m. The utilization rate of the blasting boreholes was improved from 89% to previous 94.7%. The unit consumption of explosives was significantly reduced from the original 1.24kg/m~3 minimum to 0.74 kg/m~3.Thus the profile shape results would be good and the driving speed could be highly increased. Research results will be the same geological conditions for excavating to provide reference.