Mining roadway gob-side entry retaining method suitable for thin and medium thickness coal seams

Abstract

The invention relates to a mining roadway gob-side entry retaining method suitable for thin and medium thickness coal seams. The mining roadway gob-side entry retaining method comprises the following steps that (1) floor rock obtained by mining roadway dinting are used as raw materials, suitable cement is matched as a cementing material, and a flexible isolation body is built beside a roadway close to one side of a gob area; (2) cumulative blasting holes are drilled in the hard upper roof above the gob area, the blasting holes are located in the outer side of the isolation body, the side roof of the gob area is exploded and cut down, and thus a brickwork beam structure is formed by the cut-down roof and the overlaying rock on the roof; (3) after the isolation body and the cut-down roof are stabilized, a layer of foaming agent is sprayed on the surface of the isolation body. Compared with the existing gob-side roadway driving technology, by means of the mining roadway gob-side entry retaining method suitable for the thin and medium thickness coal seams, mining without coal pillars can be achieved, the mining rate of coal is improved, and section coal pillar losses and roadway supporting cost are reduced.

Description

technical field [0001] The invention relates to a method for retaining a gob-side entryway in a coal seam, in particular to a method for retaining a gob-side entryway in a mining roadway suitable for thin and medium-thick coal seams. Background technique [0002] Gobside entry retention is one of the important means to realize coal pillar-free mining. It is of great significance to improve the recovery rate of coal resources, reduce the rate of roadway excavation, alleviate the tension between mining and connection, and realize the intensive production of mines. [0003] The traditional gobside retaining technology using gangue stacks and dense wooden pillars is only suitable for thin coal seams, while the support of concrete blocks and dense metal pillars used in medium-thick coal seams has insufficient support resistance and poor shrinkability. Shortcomings such as matching, low degree of mechanization, high labor intensity and poor sealing performance of gobs limit the ap...

AI Technical Summary

Problems solved by technology

[0003] The traditional gobside retaining technology using gangue stacks and dense wooden pillars is only suitable for thin coal seams, while the support of concrete blocks and dense metal pillars used in medium-thick coal seams has insufficient support resistance and poor shrinkability. Shortcomings such as matching, low degree of mechanization, high labor intensity and poor sealing performance of gobs limit the application range of goaf retaining technology

In recent years, there is also the technology of using high-water quick-setting filling materials to mechanize the construction of roadway protection filling belts beside the roadway, but there are disadvantages such as high filling costs and low long-term strength.

Therefore, in order to ensure the success of gob-side entry retention, it is necessary to solve the problems in the existing gob-side entry retention technology such as untimely support, small bearing capacity, poor yielding pressure, poor isolation effect of goaf, single material selection, and high cost.

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