Method for shoring tunnel roof gob-side entry driving of oblique extra-thick coal seam through asymmetric rock bolts

Abstract

The invention relates to the field of coal exploitation, in particular to a method for shoring a tunnel roof gob-side entry driving of an oblique extra-thick coal seam through asymmetric rock bolts. The method comprises the following steps: step I, respectively arranging a wind inlet tunnel and a wind returning tunnel which are respectively connected with two ends of a stopping working surface indifferent layer positions of the extra-thick coal seam in the same coal seam in adjacent segments in a staggered layer position tunnel arranging method, wherein the wind inlet tunnel is arranged alonga top plate, and the wind returning tunnel is arranged along a bottom plate; step II, arranging the wind returning tunnel which is connected with the working surface below the edge of a lower part mined-out space of a mined area section in an inner staggered manner to form the tunnel roof gob-side entry driving, and adjusting the inner staggered distance; and step III, specifically designing a rock bolt shoring scheme or a rock cable shoring scheme. Through the adoption of the method disclosed by the invention, the shoring cost is reduced, the tunnel forming speed is increased, the mine-shaftsafety is guaranteed, and high yield and high efficiency are facilitated.

Description

technical field [0001] The invention relates to the field of coal mining, in particular to an asymmetric anchor stalk support method for gob-side excavation at the roof of an inclined extra-thick coal seam. Background technique [0002] It is customary in my country to call a coal seam with a thickness greater than 8m as an extra-thick coal seam. Except for a few 10-million-ton ultra-large mines in the Shendong mining area, the maximum mining height of the working face can reach 8m, and the top-coal caving mining method is generally used in the mining of extra-thick coal seams in my country. [0003] However, traditional top-coal caving mining has the characteristics of more coal loss, low recovery rate of coal pillars, and serious problems of fire prevention, gas emission, and dust control. Affected by the coal pillars in the section, it is difficult to maintain the end support of the working face and the roadway in the lower section. [0004] For inclined coal seams, the...

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Problems solved by technology

[0006] Although the staggered seam has largely solved many problems in the mining of inclined thick coal seams, for a long time, the staggered mining has adopted the three-stage recovery technology, and the gob-side roadway excavation at the top of the gob below the edge of the goaf has been empirically adopted The main passive support method is "shelf + back plate + metal mesh". Secondly, if the gob-side excavation at the top of the roadway is completely gob-side, only a three-stage mining process can be used, that is, the curved section of the upper section of the working face Mesh laying, grouting, excavation along the goaf at the top of the lower section of the roadway and the nearby work under the false roof, using scaffolding support, high cost, complicated operation, and high labor intensity for workers, greatly reducing the speed of roadway formation. greater threat, such as figure 2 shown

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