Evolution Mechanism of Overburden Migration and Mine Pressure Control in the Process of Deep Coal Seam Mining
Aiming at the problem of strong behavior of mine pressure on the roof of Tongxin mining area,the large-scale three-dimensional similar simulation test was used to study the mining stress and displacement distribution law of roof,key strata and coal pillar area in the mining process of working face.Based on the theoretical analysis and UDEC numerical simulation method,the most suitable mining speed was obtained,and the"three zones"range and support specifications were determined.The results show that the strata movement in the process of mining presents the dynamic evolution law of slight separation,instantaneous subsidence,separation closure,intermittent stability and instantaneous collapse compaction,and the stress is mainly concentrated in the middle area of coal pillar.With the increase of mining speed,the subsidence of overlying strata is decreasing,and the optimal mining speed is determined to be 7 m/s.Through numerical simulation,it is found that the final heights of the bending subsidence zone,the fracture zone and the caving zone are 18 m,24 m and 8 m.In the initial pressure stage,the peak resistance of the support is 15 MN,and the average resistance of the support is maintained at 11.6 MN in the periodic pressure stage.
Deep coal seamMine pressure behaviorMine pressure controlMigration law of overburdenNumerical simulation
万方数据
维普
