Research on mine pressure law of isolated working face in close-distance thin coal seam under the influence of remaining coal pillar

Aiming at the problem of abnormal pressure in close-distance thin coal seam isolated working face under remaining coal pillar, the stress distribution law of 33107 isolation working face is studied by combining theoretical analysis, numerical simulation, and field measurement. The working face roof's mechanical properties and engineering characteristics were expounded under the remaining coal pillar. Once the stress distribution characteristics of the remaining coal pillar floor are obtained and the disturbance range of stress is calculated. Numerically simulated and field measurements were carried out to verify the influence of the remaining coal pillars on the pressure of the 3# coal seam. The results show that the working resistance of the hydraulic support increases by 10 MPa-12 MPa, and the dynamic load coefficient increases by 15.38%-28.46% in the area affected by the remaining coal pillar. The peak stress is more significant than 40 MPa, the stress concentration level is 1.5-2 times.