Gob-side entry retaining method for non-blasting roof-cutting and pressure releasing of soft-top coal seam

Abstract

The invention discloses a gob-side entry retaining method for non-blasting roof-cutting and pressure releasing of a soft-top coal seam. The gob-side entry retaining method comprises the following steps that 1, a roof of a reserved entry is reinforced on the side, close to a gob, of the reserved entry through an anchor rope, and working face advanced mining of anchor rope reinforcing construction is completed; 2, lanced seam holes are drilled in the side, close to the gob, of the reserved entry and form pre-splitting lanced seams, and working face advanced mining of lanced seam holes drilling construction is completed; 3, anchor withdrawing construction is conducted, working face advanced mining of anchor withdrawing construction is completed; 4, temporary reinforced supporting and stoppingwaste rock supporting are conducted on the reserved entry; and 5, the roof of the gob is collapsed to form a gob-side retained entry, and after the gob-side retained entry is stabilized, the temporary reinforced supporting in the step 4 is withdrawn. According to the gob-side entry retaining method, through drilling of the lanced seam holes, the link of blasting roof-cutting in original gob-sideentry retaining is substituted, and thus the gob-side entry retaining is safer; and meanwhile the usage amount of explosives is saved, the cost of gob-side entry retaining is reduced, the working environment is improved, and it is guaranteed that a gob-side entry retaining technology is safely conducted.

Description

Technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a method for non-blasting and decompression of soft roof coal seams to keep roadways along goafs. Background technique [0002] The increasingly mature technology of retaining lanes along the goaf has enabled the mine to achieve the goal of efficient production and cost saving. However, due to the blasting process in the roof cutting process, the blasting effect is implemented in the limited space underground, which is dangerous. The blasting effect generates a large amount of coal dust, which is not only harmful to the health of the operators, but also deteriorates the operating environment, and there is gas underground. Such as flammable gases, the blasting process poses a huge threat to the safety of mine production to a certain extent. [0003] There are a large number of coal resources in China under the "three soft" geological conditions. The roofs of these coal s...

AI Technical Summary

Problems solved by technology

However, due to the blasting link in the roof cutting process, the blasting effect in the limited space underground is very dangerous, and a large amount of coal dust is generated by the blasting effect, which is not only harmful to the health of the operators, but also deteriorates the working environment, and there is gas underground. and other flammable gases, the blasting process poses a huge threat to the safe production of mines to a certain extent

[0003] There are a large number of coal resources in my country under the "three soft" geological conditions. The roofs of these coal seams are generally I and II unstable roofs, and the cracks are developed and broken directly on the roof rocks, and the compressive strength index is very low or soft roof. Coal basically falls off the roof once it loses its support. If the newly exposed roof or top coal cannot be supported, the beam end will fall off the roof; at present, the traditional method of blasting and cutting the roof and retaining the roadway is still used for coal mining in this geology, which is dangerous. large, heavily polluted

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