Research on Technology of Close Distance Coal Seam Fully Mechanized Mining Face Passing Through Overlying Goaf Coal Pillar
In view of the safety issue of dynamic load mine pressure occurring when the 14307 fully mechanized mining face close distance underlying coal seam passes through the overlying goaf leftover coal pillars of Xiqu Mine in Xishan Coal Electricity,through applying hydraulic fracturing technology,a certain number of boreholes in the surrounding rock of the high stress area roadway are set up.Under the action of hydraulic fracturing,the residual coal pillars are destroyed in advance,reducing the pressure bearing capacity of the coal pillars boundaries.In addition,various methods such as online monitoring of the roof,observation of the roadway surrounding rock,anchor rod(cable)dynamometer observation and so on are used to guide and verify on site,effectively solving the problem of dynamic pressure accidents that are prone to occur when close distance coal seam fully mechanized mining faces passing through overlying goaf coal pillars.
close distance coal seamgoafleftover coal pillarmine pressure behaviorhydraulic fracturing
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