Gob-side entry retaining method of fully-mechanized mining/full-mechanized caving mining working face

Abstract

The invention provides a gob-side entry retaining method of a fully-mechanized mining / full-mechanized caving mining working face, belongs to the technical field of coal mine underground supporting, and is applicable to thick-coal-bed and high-gas-content coal mining working faces. By aiming at the problems generated when the existing gob-side entry retaining technology is adopted by the working face, the gob-side entry retaining method adopts the scheme that prefabricated cylindrical pier studs are arranged in a roadway arranged behind an end part hydraulic support frame of a stope working face, and in addition, square timbers are built above the pier studs, so that the pier studs can realize the in-time and firm contact with a top plate, and the effective supporting on the top plate is ensured; wood plates are used for sealing among the pier studs, the air leakage to a gob area can be effectively prevented, and the problem of spontaneous combustion of float coal in the gob area due to great air leakage quantity is solved; concrete foam is adopted for filling the steel pier studs; and the installation is convenient, the operation is simple, and the cost is low. Compared with the scheme requiring a single set of filling system for filling supporting, the method provided by the invention solves the problems of high supporting cost, system complexity and great operation difficulty, has wide practicability and belongs to the gob-side entry retaining method with the advantages that the cost is low; the construction is easy; the supporting intensity is high; and the stability is high.

Description

technical field [0001] The invention belongs to the technical field of underground support in coal mines, and in particular relates to a gob-side entry retention method for fully mechanized mining / caving working faces, which is suitable for coal mining faces with thick coal seams and high gas. Background technique [0002] Gobside entry retention is adopted in the coal mining face, that is, the original roadway is retained at the edge of the goaf for use in the coal mining face in the lower section. Gob-side retaining can minimize the loss of coal resources and reduce the amount of roadway excavation, and the thick coal seam and high-gas working face can form a Y-shaped ventilation mode, which can effectively prevent gas accumulation and over-limit problems in the working face , so gob-side retaining is an important development direction of coal pillar-free entry protection technology in mines. [0003] Since the 1950s, my country has begun to conduct theoretical and techni...

AI Technical Summary

Problems solved by technology

In the past, wooden piles or gangue walls were used to support the roadway, which not only resulted in large wood consumption, slow construction speed, high labor intensity and high cost of retaining the roadway, but also had large air leakage in the goaf and low support strength, which often caused wooden piles Or the gangue wall is unstable and damaged, and the roadway is blocked after being dumped, and the gas cannot be effectively discharged or used for the working face of the lower section, which eventually leads to the failure of the roadway retention along the gob

Using high water or paste filling method to support the roadway can reduce the air leakage in the goaf, and the strength of the filling body after condensation is relatively large, but the filling body has a long condensation time and cannot be connected to the top in time, which will easily cause the condition of the working face to deteriorate, and Need to form a separate filling system, the filling system is complex, high cost, technically difficult, difficult for workers to master

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