Actual Measurement Study on Mine Pressure Behavior Law in Thick Overlying Rock Working Face Periodic Pressure
During the stoping period of the 183lower03 working face in Jining No.3 Coal Mine,the periodic pressure of the working face has strong mine pressure characteristics,and the mine pressure behavior in the stope is strong,which can easily lead to the problem of occuring dynamic disasters.Therefore,the periodic pressure behavior law of the working face is conducted to be monitored and studied.The geological conditions,bracket force,mine pressure behavior,surrounding rock surface displacement,coal body mining stress actual measurement,microseismic monitoring,etc.of the working face are analyzed using methods of on-site investigation and research,observation data analysis,and on-site actual measurement,revealing the characteristics of the periodic pressure behavior of this working face.The observation results indicate that the working face has a periodic pressure step distance between 19-29 m,with an average of 24 m;the dynamic load coefficient during pressing is between 1.11 and 1.21.
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