Research on Distribution Law of Advanced Support Pressure in Narrow Coal Pillar Working Face

In order to solve the problem of imbalanced distribution of advance support pressure during narrow coal pillar mining under large burial depth conditions, this paper takes the coal pillar working face on the inner side of the second panel of Zhaogu Mine as the research object, and studies the stress distribution characteristics of coal pillar mining.By combining numerical simulation and on-site measurement methods, the distribution law of advance support pressure in the direction of working face advancement is revealed.The drilling stress at different depths inside the coal pillar is measured using a stress meter.The results show that during the mining process of the working face, the pressure of the support in front of the work face will experience an increase in stress, but the stress will decrease until it reaches the initial stress value.The peak stress of advanced support is approximately 5-10m away from the coal wall side, with a significant impact range of 30-35m.The maximum impact range of advanced stress can reach 90m away from the coal wall.The stress concentration coefficient ranges from 1 to 2.44.The coal pillar working face is affected by the excavation disturbance on both sides of the working face, and the stress inside the coal pillar shows a distribution trend of high, medium, and low on both sides, forming high concentrated stress at the positions of the tunnels on both sides of the coal pillar.