Extra-thick coal seam top coal caving working face roadway arrangement method

Abstract

The invention discloses an extra-thick coal seam top coal caving working face roadway arrangement method which comprises the steps that after two roadways and open-off cuts of a working face are tunneled along a coal seam bottom plate, a last mining top-following preparation roadway is tunneled along a coal seam top plate and the trend of the working face; tunneling an end mining top-along operation roadway parallel to the open-off cut every one cycle in a weighting step pitch along the end mining preparation roadway, performing loose blasting on a top plate of an end mining section working face before the advanced bearing pressure of the working face affects the end mining section working face, and then performing top-cutting presplitting blasting on a working face mining roadway, and the top plate of the end mining section is subjected to sufficient anti-reflection crushing. When the working face is pushed to the end mining section, a goaf top plate is fully caved, the gangue filling degree is good, and the overlying rock supporting capacity is greatly improved compared with a natural caving method, so that the stope advance bearing pressure distribution condition is optimized, the working face advance bearing pressure appearance strength is reduced, the size of an end mining coal column is reduced, and the retracement roadway stress environment is optimized; and part of coal resources in the tail coal mining column are recycled.

Description

technical field

[0001] The invention relates to a coal mining technology, in particular to a roadway layout method for a top-coal caving face in an extra-thick coal seam, and is especially related to maintenance of a main road during the final mining period and reduction of the final mining coal pillar. Background technique

[0002] With the increase of the coal seam height, the impact of mining on the working face, especially the top coal caving face, is gradually increasing, which is manifested in the collapse of the roof of the coal wall, the severe deformation of the mining roadway in the advanced working face section, and the remaining protective coal at the end of mining. The large column size not only increases the roadway support and maintenance costs during mining, but also makes a large amount of coal resources remain underground and cannot be mined.

[0003] After the working face is mined, the overlying roof collapses downward, destroying the initial equilibrium ...

Examples

Embodiment 1

[0062] Such as figure 1 , figure 2 , image 3 As shown, the specific steps are as follows:

[0063] A. Firstly, excavate the transport lane 1 and the track lane 2 of the working face along the coal seam floor in the extra-thick coal seam. After the tunneling reaches the design direction length of the working face, the excavation working face cuts through the working face, and installs the coal setting support on the working face 6 and other equipment, start the recovery of the working face.

[0064] B. While mining at the working face, excavate the withdrawal roadway 7 at the position of the designed stop production line, and complete the corresponding roadway support.

[0065] The formula for calculating the width of the final mining pillar 10 between the above-mentioned retraction roadway 7 and the main roadway is:

[0066]

[0067] Among them, L 1 Coal pillar width when managing the roof of the final mining face for the natural caving method; L 2 is the coal pilla...

technical field

[0001] The invention relates to a coal mining technology, in particular to a roadway layout method for a top-coal caving face in an extra-thick coal seam, and is especially related to maintenance of a main road during the final mining period and reduction of the final mining coal pillar. Background technique

[0002] With the increase of the coal seam height, the impact of mining on the working face, especially the top coal caving face, is gradually increasing, which is manifested in the collapse of the roof of the coal wall, the severe deformation of the mining roadway in the advanced working face section, and the remaining protective coal at the end of mining. The large column size not only increases the roadway support and maintenance costs during mining, but also makes a large amount of coal resources remain underground and cannot be mined.

[0003] After the working face is mined, the overlying roof collapses downward, destroying the initial equilibrium ...

Examples

Embodiment 1

[0062] Such as figure 1 , figure 2 , image 3 As shown, the specific steps are as follows:

[0063] A. Firstly, excavate the transport lane 1 and the track lane 2 of the working face along the coal seam floor in the extra-thick coal seam. After the tunneling reaches the design direction length of the working face, the excavation working face cuts through the working face, and installs the coal setting support on the working face 6 and other equipment, start the recovery of the working face.

[0064] B. While mining at the working face, excavate the withdrawal roadway 7 at the position of the designed stop production line, and complete the corresponding roadway support.

[0065] The formula for calculating the width of the final mining pillar 10 between the above-mentioned retraction roadway 7 and the main roadway is:

[0066]

[0067] Among them, L 1 Coal pillar width when managing the roof of the final mining face for the natural caving method; L 2 is the coal pilla...

Images