Abstract:In this paper, aiming at the problem of roof and surface subsidence caused by near-surface fluorite room mining, the Mohr-Coulomb model of ore body mining is established. The influence of mining disturbance on overlying strata is studied by numerical analysis, and the displacement settlement value and stress distribution of roof under different mining schemes are obtained. The comprehensive simulation results are analyzed. Due to the decrease of the width of the room mining, the stress concentration phenomenon occurs, which leads to the increase of the maximum vertical stress of the roof of the 10 m, 8 m, 6 m and 4 m room width mining schemes. Combined with the displacement analysis results, it can be seen that due to the shallow buried depth and the large reduction of the roof hanging span. Finally, the small increase of stress does not have a greater impact on the roof settlement, so that the roof settlement is still proportional to the width of the mine. Under the supporting conditions, when the mining of the 4m width scheme is advanced to about 30m, the roof and the surface will have a certain settlement.