Z-shaped strip working face mining method

Abstract

The invention relates to a Z-shaped strip working face mining method. A mining area range is divided into a plurality of strip groups; a strip working face boundary is formed between a strip working face and a strip coal pillar; the strip working face boundary is formed between the strip working face and the strip coal pillar; a strip boundary return airway beginning from a strip transporting sequence connecting part to the intersection position of the strip working face boundary is used as a strip working face open-off cut position to form a Z-shaped mining layout; in the recovery process, aretained roadway is reserved along the position of the strip working face boundary to communicate with a strip group boundary return airway; and before the next strip group is mined, strip transporting sequence, strip backing sequence and strip boundary return airways need to be tunneled. The Z-shaped strip working face mining method has the advantages that the system is simple, a lot of equipmentinvestments are not needed, the tunneled roadways are reduced by 50%, the support cost is reduced by 50%, the construction is simple, workers are reduced by 60%, and the 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 mining" refers to mining under ground facilities such as villages, rivers, industrial buildings, power lines, pipelines, railways, gas pipelines, etc. Only by adopting special mining methods can underground mining be used to avoid damage to ground structures. A variety of mining techniques can be summarized into three categories: the first category, filling mining, that is, the existing mining system remains unchanged, but after the coal is mined, the gob is completely filled with other materials, so that the method of complete filling It can maintain the deformation of the stratum and will not affect the ground; the second type, partial filling, is to use the principle that the rock layer can be kept evenly subsidence after a certain mining width and burial depth are greater than ...

AI Technical Summary

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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