Mine Pressure Behavior Laws and Support Suitability of"Knife" Style Working Face

In order to study mine pressure behavior laws and support suitability situations of "knife" style mining face in shallow seam, we use KJ27 hydraulic pressure support online monitoring system and numerical simulation of FLAC^3D to measure and analyze 23103 working face of Zhuanlongwan Coal Mine. The results showed that: the first weighting step distance of 23103 short face is 49 m, the distance of periodic weighting step is about 10.6 m, the factor of bracket dynamic load is about 1.30; first weighting step of long face is about 35.9 m, the distance of periodic weighting step is about 9.54 m, the factor of support dynamic load is about 1.328; during the pressurized period, the working resistance distribution features of the supports would have high resistance at the middle part of the coal mining face and low resistance at the two ends of working face; the support pressure would be concentrated at 7 200 kN to 10 500 kN and the rated pressure is 11 000 kN, so the present supports can meet the production requirements.