Rapid stoping method for pre-treating hard rock mass invaded by coal face in advance

Abstract

The invention discloses a rapid stoping method for pre-treating a hard rock mass invaded by a coal face in advance. The rapid stoping method comprises the following steps that S1, a large-diameter hydraulic fracturing deep drill hole is constructed in a roadway of the coal face; S2, hydraulic fracturing is carried out in the large-diameter hydraulic fracturing deep drill hole, hydraulic cracks are artificially manufactured, and the intrusive hard rock mass in the working face stoping range is separated from a top plate and a bottom plate of the coal face; S3, large-diameter presplitting blasting deep drill holes are constructed in the roadway of the coal face; and S4, pre-splitting blasting is carried out in the large-diameter pre-splitting blasting deep drill hole, and the intrusive hard rock mass within the working face stoping range is crushed. The outdated technology that mining can only be carried out after explosive blasting is carried out in the coal face is eliminated, the influence of the coal face invading into the hard rock mass on mining of the coal face is reduced, and rapid mining of the hard rock structure area of the coal face is achieved.

Description

technical field [0001] The invention relates to a method for rapid recovery of intruded hard rock mass in advance pretreatment of coal mining face, belonging to the field of coal mining. Background technique [0002] In the process of coal mining, due to geological factors and other influences, hard rock mass intrusion into the coal mining face often occurs within the mining range of the coal mining face. Due to the high strength and good integrity of the intruded hard rock mass, the shearer cannot cut normally, which seriously affects the high-yield and high-efficiency coal mining face and restricts the high-quality development of the mine. [0003] In the prior art, a method and device for dealing with crossing faults in fully mechanized mining face (publication number is CN105387775A), which discloses the arrangement of pre-splitting blastholes and medium-depth blastholes in the coal mining face for hard rock formations or hard rock formations. This method has the follow...

AI Technical Summary

Problems solved by technology

Due to the high strength and good integrity of the intruded hard rock mass, the shearer cannot cut normally, which seriously affects the high-yield and high-efficiency coal mining face and restricts the high-quality development of the mine.

[0003] In the prior art, a method and device for dealing with crossing faults in fully mechanized mining face (publication number is CN105387775A), which discloses the arrangement of pre-splitting blastholes and medium-depth blastholes in the coal mining face for hard rock formations or hard rock formations. This method has the following defects: 1. Due to the method of processing the hard rock inside the working face, during the blasting process, it will cause damage to the support and instruments of the working face, especially in intelligent equipment with more precision instruments. The coal mining face cannot be applied; 2. Due to the method of processing hard rock inside the working face, the blasting process will affect the normal mining of the working face, and parallel operations of blasting and mining cannot be realized; 3. In this method, the fully mechanized mining face The middle and deep holes are arranged in a triangular pattern, the distance between medium and deep blastholes is generally 0.4m to 2.5m, and the row spacing of blastholes is generally 0.2m to 1.5m. According to this arrangement of blastholes, when the coal mining face encounters When the impact range of the hard rock is large, there are many pre-splitting blastholes and medium-depth blastholes to be constructed in the working face, the construction time of the blastholes is long, and the labor intensity of the workers is high; 4. In this method, the top of the coal mining face is arranged Pre-splitting blast hole, the blast hole is close to the roof of the coal mining face. After detonation, it is easy to cause damage to the roof of the working face, which is not conducive to the roof management of the working face during mining

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