Gob-side entry retaining method capable of avoiding dynamic pressure influence on coal mining

Abstract

The invention relates to a gob-side entry retaining method capable of avoiding dynamic pressure influence on coal mining. The gob-side entry retaining method comprises the following steps: dividing a coal bed into mining areas and dividing the mining areas into a plurality of sections; carrying out open-off cutting operation on the front ends of a tail gate and a haulage way of the first section, carrying out mining operation on open-off cuts forwards to form a working face, and forming a gob behind the mined working face; and repairing the haulage way of the first section from a position away Lm from the rear side of the working face in the gob, namely, a range less than Lm is used as a gob-side entry retaining temporary supporting section, and the gob-side entry retaining temporary supporting section is of a temporary steel frame supporting structure and is assisted by a monomer column for reinforced supporting. According to the gob-side entry retaining method, the gob-side entry retaining cost is reduced, the gob-side entry retaining difficulty is reduced, a certain distance is left between the gob-side entry retaining operation and the working face, the construction is not influenced with one another, a repaired roadway and an isolation strip are not suffered from high dynamic pressure influence before use, and the roadway is stable and firm and can be maintained easily.

Description

technical field [0001] The invention relates to the technical field of coal mine safety production, in particular to a gob-side entry retaining method for avoiding the influence of dynamic pressure in coal seam mining. Background technique [0002] Gobside entry retention technology is a relatively mature technology in China's coal mining. Its basic principle is to maintain a roadway at both ends of the coal mining face during the mining process without abandoning it, and artificially construct isolation between the roadway and the goaf Generally, the isolation belt is constructed at the rear of the working face. There are mainly two methods of solid material stacking and paste filling, and the left roadway serves the adjacent section, so the coal pillar-free roadway between the sections is realized. It improves the recovery rate of coal resources, reduces the mine excavation rate, relieves the tension of excavation replacement, and can realize the Y-shaped ventilation of t...

AI Technical Summary

Problems solved by technology

[0006] At present, many coal mines in China have unanimously carried out targeted repairs on the sections where the local deformation of the roadway is relatively serious, but the roadway is always in a passive repair state, and the repaired roadway is still deformed, resulting in the repeated investment of I-beams. A large amount of material and labor costs, and the difficulty of safety management for repairing the shed also increases

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