Far field key stratum roof cutting and pressure releasing roadway protection method based on triangular plate structure model

Abstract

The invention discloses a far field key stratum roof cutting and pressure releasing roadway protection method based on a triangular plate structure model and belongs to the field of coal mining. The method comprises the steps that the stratum position of a far field key stratum influencing working face free roadway mine pressure behavior is determined; the arranged position coordinate of ground drilling is determined, and drilling construction is conducted; and a complete cutting fracture plane parallel to a coal pillar is formed on the far field key stratum through the ground drilling fracturing technology. Presplitting of the far field key stratum above a free roadway in advance is facilitated, and the cutting plane parallel to the coal pillar is formed on the far field key stratum, so that stress transferring is obstructed, mine pressure is released, the length of a lateral rotation block body of a fractured side original roof rock stratum of the free roadway is reduced, the strong mine pressure behavior of the free roadway can be relieved essentially, the supporting requirement of a roof is reduced, accordingly the reserved width of the coal pillar is reduced greatly, the coal recovery rate is increased effectively, and economic benefits are increased.

Description

technical field [0001] The invention designs a roadway protection method, which is especially suitable for the far-field key layer roof cutting and pressure relief roadway protection method based on the triangular plate structure model used in the technical field of mine safety in underground coal mines. [0002] technical background [0003] The emergence of strong mine pressure has always been an important factor affecting the safe production of coal mines. With the increase of mining depth in western coal mines and the promotion of fully mechanized caving technology in extra-thick coal seams, strong mine pressure has become more frequent. In the event of a frame accident, the mine pressure in the adjacent roadway is also particularly prominent. Usually, the 100-meter roadway on the advanced working face has been seriously deformed, which seriously affects and restricts the safe and efficient mining of coal mines. At present, the traditional rock pressure theory, which rega...

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Problems solved by technology

[0003] The emergence of strong mine pressure has always been an important factor affecting the safe production of coal mines. With the increase of mining depth in western coal mines and the promotion of fully mechanized caving technology in extra-thick coal seams, strong mine pressure has become more frequent. In case of accidents, the mine pressure in the adjacent roadway is also particularly prominent. Usually, the 100-meter roadway on the advanced working face has been seriously deformed, which seriously affects and restricts the safe and efficient mining of coal mines.

At present, the traditional rock pressure theory, which regards the first layer of sub-key layer (i.e. Laoding) as the dominant rock pressure in the stope, will not be able to fully explain the problem of strong rock pressure in fully mechanized caving mining in extra-thick coal seams. The measures for pressure manifestation will no longer be effective. Therefore, it is necessary to consider the influence of the fracture movement of the key stratum in the far field of overlying rock on the manifestation of mine pressure. The proposed triangular plate structure model of the key stratum in the far field essentially explains the The work is faced with the mechanism of strong mine pressure in empty roadways and working faces. Up to now, there are very few methods to alleviate the occurrence of mine pressure based on this

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