The stability of the roof rock is different, and the allowable exposure area of ​​the top pole is also different. Different working surface forms are used depending on the allowable exposed area. According to the working face form, the single-layer caving method can be divided into three types: the long-wall caving method (referred to as the long-wall method), the short-wall caving method (referred to as the short-wall method), and the approach-type caving method. Cylindrical Grinding Machine,Surface Grinder Ananzi,Surface Grinder Automatic,Cylindrical Od Grinder WEISS MACHINERY CO., LTD. , https://www.weissmachinerys.com
Mining method mainly used to breakout monolayer of roof stone is not stable, the thickness is generally less than 3m gently inclined seams, such as iron ore, Meng ore, bauxite clay mineral and the like. The inter-stage mineral layer is divided into ore blocks, and the mining work of the ore block is advanced according to the full thickness of the ore body. When the working face is advanced by a certain distance, in addition to retaining the space required for the mining work, the pillars are planned to be recovered and the roof of the goaf is collapsed, and the goaf is filled with the collapsed top rock to control the top pressure.