Experimental Research on Fully-Mechanized Mining with Large Cutting Height in Spontaneous Combustion Thick Coal Seam

In order to solve technical problems of low recovery rate and serious goaf spontaneous combustion in Jiaoping Mining Area, focusing on technical links s uch as reasonable cutting height of fully-mechanized working face, mining equipment selection and matching, auxiliary transportation, ventilation and goaf spontaneous combustion prevention, this paper made a comprehensive analysis on feasibility of fully-mechanized mining in No. 3-2 coal seam. The industrial test of trial working fac e showed that the ZY10500/27/58 hydraulic support could meet the roof supporting requirements, and the MG750/1 860-GWD miner had a failure rate lower than 10%. T he recovery rate reached to 93. 8% and advancing velocity amounted to 119 m per month, both of which had been greatly improved than top coal caving technology. Th e total width of heat dissipation and oxidized zone was 95 m. With neither C2H2、C2H4found in bundle tube monitoring system, nor spontaneous combustion in goaf, th e security situation of working face realized fundamental improvement.