Study On The Pressure Feature And Staggered Distance Of Ultra-close Seams Combined Mining In Daanshan Coal Mine

In order to solve the mining lag and connection of levels nervous problems in production about+400the axis10of upper gateway and the axis10of down gateway in Daanshan coal mine,combined with the two coal seams hosting feature of storage unstable and incorporated in local, by the means of theoretical analysis, numerical simulation and field mine pressure monitoring, with a thorough study and analysis about the working face staggered distance of ultra-close thin seams combined mining and the tunnel layout staggered distance.In this paper, firstly making the theoretical analysis and research about stress field distribution of stope surrounding rock under the field geological conditions,the author summarizes the existing research results and conclusions in the related aspects which are made by previous research scholars, specially make a deep research about the working face staggered distance in mining at contiguous seams combined mining and extraction roadway arrangement for up and gown seam mining,summarizes the preferences formula and empirical value for reasonable staggered distance,and makes a research about support stress distribution in coal wall and coal pillar,which concluded the formula between peak support stress of coal wall and distance of coal wall and the empirical value.With the FLAC3D numerical simulation software simulating the different staggered distance in mining and staggered distance in extraction roadway arrangement of the axis10of upper gateway and the axis10of down gateway in other geological conditions,through the surrounding rock stress distribution and stress concentration factor,get the reasonable working face staggered distance and the tunnel layout staggered distance.Finally,combined with the field geological conditions and the existing mining conditions,the suitable mining scheme for the coal was obtained. The conclusions of the research has certain theory value and practical significance for contiguous seams mining,which could provide reference for coal mining under similar geological conditions.