The roof accident in the working face is mainly caused by the failure of the hydraulic support to the roof support, which is mainly manifested as the roof leakage, the coal wall slab, and the hydraulic support, which cause casualties.
The top plate accident in the work surface is mainly caused by the failure of the hydraulic support to the top plate support, mainly manifested in the leakage of the roof plate, coal wall help, hydraulic support pressure frame and other casualties
The roof accidents in the working face are mainly caused by the failure of hydraulic support to the roof, which are mainly manifested as roof leakage, coal wall spalling, hydraulic support crushing and so on<br>