Thick seam large mining height working face gob-side entry retaining method

Abstract

The invention discloses a thick seam large mining height working face gob-side entry retaining method, wherein a flexible yield airbag is installed on the deformed space retained on the top part of the filling body besides the lane; the height of the filled airbag is equal to the prediction value of the sinking quantity of the top plate; the airbag is filled with air, the inflation pressure is 3MPa; a one-way decompression valve is installed on the bag body and the decompression pressure is 4MPa. The flexible yield airbag is arranged, thus on the one hand, effectively protecting the filling body besides the lane and achieving the purpose of gob-side entry retaining, and on the other hand, preventing the coal in the gob from spontaneous combustion, ensuring safe production and simultaneously improving the mining coefficient of the coal.

Description

technical field [0001] The invention belongs to the coal mine roadway support technology, and is suitable for the gob-side roadway retention technology under the condition of deep mine and large mining height. Background technique [0002] Empty entry retaining technology is a major reform of coal mining and mining roadway support technology. It can improve the recovery rate of coal sources, reduce the rate of roadway excavation, ease the tension in mining, reduce the probability of coal and gas outburst, and realize the intensive production of mines. Have a significant effect. [0003] At present, in thin coal seams (thickness not greater than 1.3m) and medium-thick coal seams (1.3-3.5m) with a burial depth of less than 600m, gob-side entry retention generally adopts masonry gangue belts, small coal stacks, cluster pillars and roof cutting. Concrete filling and other technologies are used for roadside support. However, in deep wells (the burial depth greater than 600m bel...

AI Technical Summary

Problems solved by technology

However, in deep wells (the burial depth greater than 600m belongs to deep wells) thick coal seam (coal seam thickness greater than 3.5m) working face, due to the large mining height (mining height greater than 3.5m is called the large mining height) leads to increased elevation, the lateral direction behind the working face During the turning and sinking process of the old top rock beam, under the joint action of the old top rock beam and the direct top rock formation, the mine pressure on the gob-side entry retaining increases sharply, and the current roadside support technology cannot effectively support the large mining height work The top plate on the upper face caused severe deformation of the roadway, which manifested as bulging of the bottom plate and crushed filling body, which could not meet the requirements of ventilation, equipment transportation and pedestrians in the mining of the next working face.

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