Underground longwall mining can seriously disturb the surrounding rock masses above panel. A surface cracking zone, continuous deformation fractured and caved zone be formed in overlying strata (termed “four zones”), which may further result spontaneous combustion of coal seams water inrush. It is essential to study predict development characteristics four zones induced by guarantee safety. The...

Surface subsidence caused by underground coal mining has received wide attention due to its impact on the ecological environment. To obtain first-hand data subsidence, we arranged line measurement stations in area of Weiqiang coalfield and implemented surface movement observation at first working face obtained dynamic curve. The curves reflected initial, active declining stages each point a bas...