Study On Deep Hole Blasting And Mine Pressure Characteristics Of Thick And Hard Sandstone Roof

In our country,coal has always been the basic energy source,but with the continuous exploration and exploitation,the shallow resources of coal have disappeared,and most of the coal mines have entered the deep mining period.In the deep coal seam mining process,the phenomenon of crushing or crushing the support of the thick hard roof of the coal seam may occur from time to time.If no coercive measures are taken in time,the area will form a large area of suspended ceiling.The collapse of large-scale suspended ceilings will bring great harm.Firstly,it will cause devastating impact on the working face,causing heavy casualties.Moreover,the high concentration of gas from the spout will form a powerful storm.The work surface,brackets and the dampers in the adjacent roadway will be damaged by its strong impact.This paper improve the deep hole pre-splitting blasting scheme and technical parameters of thick and hard sandstone roof by deep hole pre-splitting blasting,mine pressure observation and analysis on the 2098 fully mechanized mining face and hard sandstone roof of Linhua Coal Mine in Guizhou.Safe and efficient mining provides a positive reference for coal seam mining under similar conditions,and also proves the feasibility and operability of the technology.In this paper,the deep hole pre-splitting blasting scheme and mine pressure monitoring scheme are designed and formulated based on the 2098 working face of Linhua Coal Mine.Through the design of the scheme,we analysed the deformation and collapse characteristics of the roof of the 2098 fully mechanized mining face.After comparative analysis,the pre-cracking deep hole blasting technology has achieved better pre-cracking.The supporting force of the working face and the macroscopic mine pressure appear effectively alleviated and controlled.Figure[10]table[10]reference[58]...