A Z-shaped strip working face mining method

Abstract

The invention relates to a Z-shaped strip working face mining method. The mining area is divided into several strip groups. There is a strip working face boundary line between the strip working face and the strip coal pillar. The strip working face There is a boundary line of the strip working face between the coal pillar and the strip coal pillar, and the position where the return airway at the strip boundary starts from the connection with the strip Yunshun to the intersection of the boundary line of the strip working face is used as the opening position of the strip working face. A Z-shaped mining layout is formed. During the mining process, a retaining roadway is reserved along the boundary line of the strip working face to connect with the return airway at the boundary of the strip group; before the mining of the next strip group, it is necessary to excavate the strip transport, strip return and strip Boundary return alley. The system of the invention is simple, does not require a large amount of equipment investment; reduces roadway excavation by 50%, supports cost by 50%, construction is simple, employs 60% less, and labor intensity is reduced.

Description

technical field [0001] The invention relates to the "three-down" mining technology of coal mines, in particular to a Z-shaped strip working face mining method. Background technique [0002] "Three-down mining" refers to mining below ground facilities such as villages, rivers, industrial buildings, power lines, pipelines, railways, and gas pipelines. Only special mining methods can be used to avoid damage to ground structures by underground mining. A variety of mining techniques and methods can be summarized into three categories: the first category, filling mining, that is, the existing mining system remains unchanged, but after the coal body is mined, other materials are used to completely fill the goaf. It can maintain the formation deformation without affecting the ground; the second type, partial filling, is to use the principle that a certain mining width and buried depth are greater than 1:3 to keep the rock layer subsidence evenly. It is to divide the area into sever...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of high tunneling rate in the existing narrow strip mining technology system without filling, and provide a mining method that adopts Z-shaped working face arrangement, adopting Z-shaped working face instead of U-shaped working face, changing System layout and mining process method, each strip is excavated with a trough, and a wide entry channel is reserved at the end of the working face as return air during mining, which can reduce the excavation rate by half. Since the entry is mainly for ventilation purposes, support The maintenance structure is simple, the amount of materials used is less, and the cost of retaining lanes is far lower than that of ordinary lane digging.

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