关键词: 瓦斯抽采 周期来压 筛管护孔

Abstract: Dashuitou Coal Mine is an outburst coal mine with highlylocated gas in "triosoft (soft roof,soft floor and soft coal quality) thick seams.The East 106 working face was subject to the influence of the fault belt and was in an area of overlaying crustal stress,therefore under huge gas and mine ground pressure.By analyzing the relationship between working face progress and the caving zone,fraction zone and curve subsidence zone in the goaf,the author developed a reasonable design of the highlylocated gas drainage drill holes and employed wholeprocess screen pipe hole protection based on the effect of the periodic weighting of the fully mechanized caving face on highlylocated boreholes so as to avoid hole collapsing and to guarantee the effective lapping of highlylocated gas drainage boreholes.The above study results is of great significance to the spread of the method with better gas controlling effect,costs,operating efficiency,etc.than traditional drainage boreholes in gas control in coal mines.

Key words: Gas drainage,Periodic weighting,Screen pipe hole protection