Strata selection of floor return air rock roadway gob-side entry retaining in high gas mine caving face
No.3 coal is mined in Changcun coal mine,the gas content in the coal seam is high,the quantity of gas emission is large,and the upper corner gas exceeds the limit seriously.In order to ensure that the gas in the upper corner does not ex-ceed the limit,the gas is pre-extracted by drilling hole in the rock roadway of coal floor,and the safe production of working face,and realize the balance of extraction and mining.2305 and 2306 working faces are jointly arranged,sharing a floor rock roadway as goaf-along returning roadway's return air lane and extraction lane.Through the theoretical calculation and exper-imental analysis of geological conditions,we determine a reasonable location of rock roadway,ensure the roadway cannot be deformed during the first and secondary mining.Compared with the coal roadway(return air roadway),the cost of roadway maintaining is reduced,and system layout is simple with a good prospect for application.
fully mechanized caving facehigh gas contentgob-side entry retainingY-shaped ventilationlocation of floor rock roadwaypre-extraction of bottom extraction roadway
万方数据
维普
