Mine pressure behavior in main haulage roadway of fully mechanized working face in Buertai Coal Mine
In view of the insufficient research on mine pressure behavior in the mining of relatively deep coal seam in extra-large mine of Shendong Mining Area,we took 22208 fully mechanized mining face of Buertai Coal Mine as the engineering background,and conducted field research and numerical simulation on the ground pressure under this condition.The following conclusions were obtained:According to the roadway deformation monitoring,the total deformation of the main haulage roadway is not significant,the roadway deformation is controllable;According to the stress monitoring,after 45 m advancing from the working face it start entering the area affected by advance stress,and the stress begins to increase significantly.At about 10 m,the stress rises obviously,and the coal wall may suffers from rib heaving and spalling;It is speculated that this section is in the peak area of advance abutment pressure;therefore,the advance anchor cable protection must be strictly implemented.Numerical simulation analysis shows that under the support mode of anchor bolt and cable,the range of principal stress and shear stress are reduced compared with that without support,and the integrity of surrounding rock is improved.The number of plastic blocks in the roof decreased,mainly due to tensile failure.The plastic zone of the two sides of the roadway is smaller,and shear failure is the main failure.The research can provide reference for mining pressure control of fully mechanized mining face with high mining intensity under such conditions in Shendong mining area.
Shendong mining arearelatively deep seammain haulage roadwaymine pressure behaviornumerical simulation
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