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.
关键词
综放面/高瓦斯/沿空留巷/Y型通风/底板岩巷位置/底抽巷预抽
Key words
fully mechanized caving face/high gas content/gob-side entry retaining/Y-shaped ventilation/location of floor rock roadway/pre-extraction of bottom extraction roadway
维普
万方数据