Gob-side entry retaining method for coal mine gateway by directional-predetermined crack blasting and truncating crest and pressure relief mode

Abstract

The invention discloses a gob-side entry retaining method for a coal mine gateway by a directional-predetermined crack blasting and truncating crest and pressure relief mode. The gob-side entry retaining method comprises the following steps of firstly, equidistantly constructing anchor cables (3) at one side of a preserved gateway (1) along the trend; secondly, constructing a W-shaped steel strip (4) for connecting the anchor ropes (3) to form a whole, and performing lock gate support; thirdly, equidistantly constructing pre-split blasting holes (5) between the constructed positions of the anchor ropes (3) and a mining working face (2) along the trend; fourthly, placing directional round tubes (6) in the pre-split blasting holes (5); fifthly, laying a metal net (7) at the gobbing area of the preserved gateway (1); sixthly, erecting wooden pillars (8) in the preserved gateway (1) for reinforcing support. According to the gob-side entry retaining method disclosed by the invention, the defects that when an existing underground gateway of a coal mine generally adopts methods of roadside filling or entry-in support reinforcing and the like to realize gob-side entry retaining, and the gob-side entry retaining is realized by adopting a roadside filling technology, the construction technology is complex, the filling cost is high and the management difficulty is high are overcome, and when the entry-in support reinforcing method is adopted, the labor intensity is improved, the entry retaining effect is poor and the like are solved.

Description

technical field [0001] The invention relates to a method for directional pre-splitting blasting of a coal mine recovery roadway for roof cutting, pressure relief and gob-side roadway retention, and belongs to the technical field of coal mining. Background technique [0002] At present, the mining roadway of underground coal mines is often retained along the goaf by roadside filling or enhanced support in the roadway to keep the mining roadway, and the original roadway section is kept for the next coal mining face. The roadway is retained, the construction process is complicated, the filling cost is high, and the management is difficult; the method of strengthening the support in the roadway increases the labor intensity of the workers, and the effect of the roadway is poor. A new method is used to retain the roadway along the goaf in the underground mining roadway of the coal mine. Contents of the invention [0003] The technical problem to be solved by the present invent...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for directional pre-splitting blasting of coal mine mining roadway, roof cutting, pressure relief and gob-side roadway retention, so as to solve the problem that the existing coal mine mining roadway often uses roadside filling or roadway reinforcement support. When retaining roadways along the goaf, the roadside filling technology is used to retain the roadways along the gob, the construction process is complicated, the filling cost is high, and the management is difficult; the method of strengthening the support in the roadway increases the labor intensity of the workers, and the effect of the roadway is poor.

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