Abstract:
After the coal mining face is mined, the pressure transmitted by the surrounding rock in the goaf will experience a process from growth to stability, during this period, the growth rate and pressure distribution of overburden pressure in goaf have a direct impact on the safety production of working face and the surrounding roadway support. In order to deeply study the overburden pressure distribution characteristics of goaf after push mining in adjacent mining faces, this paper studies the overburden pressure distribution characteristics of goaf in adjacent fully mechanized mining faces through the combination of field data measurement and theoretical analysis, and obtains the distribution law of goaf pressure in strike and dip direction. The results show that: after the overburden pressure of goaf is stable, its tendency overburden pressure presents “□” parabolic distribution, which is specifically expressed as the overburden pressure in the middle of goaf > the overburden pressure in the lower part of goaf > the overburden pressure in the upper part of goaf; the change of overburden pressure in goaf is divided into four stages: initial growth period of pressure value, slow rise period of pressure value, rapid growth period of pressure value and gradual stabilization period of pressure value.