Deep Hard Roof Strong Characteristic of Mine Pressure and Control
In order to study a series of problems such as the difficulty of hard roof collapse and the increased possibility of inducing strong mining pressure during mining under hard roof.Taking the 31103 mining face of a certain mine as an example,FLAC-3D software was used to simulate the dynamic changes of coal and rock instability in the hard roof during coal seam mining.The changes in advance support pressure of the working face under different coal and rock thicknesses were compared,and the characteristics of strong mining pressure in the hard roof were summarized.These rules can provide a basis for roof weakening,pressure relief in dangerous areas of strong mining pressure,and maintenance of mining tunnels.Based on numerical analysis results and combined with on-site practice,starting from the aspects of defense and crisis relief,the advanced deep hole pre-splitting blasting and large-diameter drilling coal unloading schemes are combined to reduce the pressure intensity of the working face,eliminate the hidden danger of disasters in areas with strong mining pressure,and ensure safe and efficient mining of the working face.
hard roofstrong pressurenumerical simulationprevention and control measures
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万方数据
