Method for ensuring fully-mechanized top coal caving recovery rate of three-soft thick coal seam roadway tunneling along top

Abstract

The invention relates to a method for ensuring the fully-mechanized top coal caving recovery rate of three-soft thick coal seam roadway tunneling along top, and effectively solves the problem of ensuring the fully-mechanized top coal caving recovery rate of three-soft thick coal seam roadway tunneling along top. The method includes: employing a rectangular tunnel cross-section, conducting tunneling along coal seam roof, and performing bolt-mesh-anchor active support; performing tunneling along the tunnel roof to a mining area boundary, and carrying out bottom digging downward to make the tunnels along the coal seam floor; conducting tunneling along the seam floor to hole through two roadways so as to form open-off cut; laying a caving coal hydraulic support, a conveyor and a coal mining machine on a working surface, arranging two large mining height end hydraulic supports respectively at the ends connecting the working surface and the two side roadways, making the two roadways always in an advanced bottom digging tunneling state, conveying the tunnelled coal to a working surface conveyor by a loading machine, ensuring the tunnels and the bottom plate of the working surface always at one plane triangle coal and leaving no triangle coal. The method provided by the invention has the advantages of simplicity, easy operation and use, low cost and good effect, can effectively guarantee the fully-mechanized top coal caving recovery rate of three-soft thick coal seam roadway tunneling along top, and improves coal production output.

Description

technical field [0001] The invention relates to a coal mine mining technology, in particular to a method for ensuring the recovery rate of a three-soft-thick coal seam roadway along the top of fully mechanized caving mining. Background technique [0002] For the third-soft coal seam with relatively small coal roof, floor and coal seam strength, it refers to a thick coal seam with a thickness of about 6.0m. Three methods are mainly adopted: layered mining, high mining height mining full thickness at one time, and top coal caving mining full thickness at one time . In layered mining, the roadway is repeatedly arranged, and the efficiency is low. One-time mining of the large mining height working face is easy to cause the problem of coal wall slabs at the working face, and the top-coal caving mining is a relatively safe and efficient method. [0003] The full-thick coal mining method of fully mechanized caving mining in thick coal seams is to arrange a coal mining face with a ...

AI Technical Summary

Problems solved by technology

If it is arranged along the bottom of the coal seam, the connection between the working face and the roadway is relatively straight, and the coal recovery rate of the working face is relatively high. However, under the condition of three soft coal seams, the roof of the roadway is soft coal with low strength, and it is difficult to support it with bolts and cables. Large, prone to roof fall disasters

If the roadway is arranged along the roof of the coal seam, which is a rock formation, the use of anchor rods and anchor cables can play a role in controlling the roof. However, since the working face is arranged along the bottom plate, the connection between the working face and the roadway needs to be raised gradually, forming a " "boat" shape, a large amount of triangular coal is likely to be left at the joint between the working face and the roadway during mining, which affects the coal recovery rate of the working face

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