A direct coal pillar recovery method for the upper panel of the goaf area with residual coal resources based on paste filling

Abstract

The present invention relates to a method for directly mining the upper mountain coal pillar in the goaf area based on paste filling. The present invention uses the gob-side entry retaining technology to solve the problem of the remaining coal pillars between working faces. At the same time, paste filling areas are arranged closely along the upper mountain of the mining area on both wings, so that the upper mountain coal pillar in the mining area does not form an isolated working face during recovery, and the upper mountain coal pillar of the mining area can be immediately mined after the longwall working faces on both wings are mined, realizing coal pillar-free mining of the entire mining area. In addition, the present invention creatively gives a mining plan for the upper mountain coal pillar of the mining area. The upper mountains of the mining area are all arranged in the coal seam and close to the paste filling area. No coal pillars need to be left on both sides of the upper mountain of the mining area, only left between them. The transportation upper mountain and the track upper mountain are used as the transportation roadway and the return airway respectively during the mining of the upper mountain coal pillar of the mining area. After that, a ventilation plan of two intakes and one return is adopted in combination with the gob-side entry retaining technology, greatly saving the roadway driving workload and improving the mining recovery rate of the mining area.

Description

Technical Field

[0001] The present invention relates to the field of longwall mining along the strike in coal mines, and specifically to a method for mining residual coal resources in a mining area by using paste for local filling. Background Art

[0002] The longwall mining method along the strike is the most commonly used mining method in the process of coal resource mining in China. Along the strike of the coal seam, return air headings and haulage headings are set on both wings of the mining area to form a mining space. At the same time, mining area rises are arranged along the dip in the middle of the mining area to connect the return air heading and the haulage heading with the main haulage roadway and the main return airway. A mining area is arranged with multiple neatly planned longwall working faces along the strike. Therefore, the service life of the mining area rise is relatively long, and protective coal pillars are left to reduce the impact of the longwall working face mining on both wings on the mining area rise, which seriously wastes coal resources. If re-mining is carried out at the end of the mine, additional support needs to be carried out on the original main haulage roadway and the main return airway. And because the coal pillar of the mining area rise is an isolated working face with goaf on both sides, it is difficult to mine due to the influence of mine pressure, etc. At present, the partial mining method is mainly adopted, and the recovery rate of partial mining is less than 40%. Therefore, there is an urgent need for a method to solve the mining of the coal pillar of the mining area rise above to solve the problem of coal resource waste. Summary of the Invention

[0003] In view of the deficiencies in the above-mentioned prior art, the present invention provides a direct mining method for the coal pillar of the mining area rise of residual coal resources based on paste filling, including the following steps:

[0004] S1. A number of mining areas are arranged in sequence along the strike between the main haulage roadway and the main return airway arranged along the strike. The mining areas adopt a two-wing layout method, that is, a mining area rise along the dip is arranged in the middle of the strike of the mining area. The mining area rise includes a haulage rise arranged on the right side in the coal seam and a track rise arranged on the left side. The lower parts of the haulage rise and the track rise are connected to the main haulage roadway, and the upper parts are connected to the main return airway;

[0005] Preferably, the mining area rise is connected to the main return airway through an H-shaped return air connection roadway.

[0006] S2. A haulage heading and a return air heading are driven in the coal seam along the strike in the left and right wings of the mining area, and a cutting eye is used to connect the two. The other end of the haulage heading is connected to the haulage rise, and the other end of the return air heading is connected to the track rise. The other end of the haulage heading is simultaneously connected to the track rise through a U-shaped roadway connection roadway to form a longwall working face;

[0007] Preferably, the left side of the U-shaped roadway connection roadway is connected upward from the track rise to the haulage heading of the left wing, and the right side of the U-shaped roadway connection roadway bypasses the haulage rise through the bottom rock formation from the track rise and is connected to the haulage heading of the right wing.

[0008] Preferably, the haulage gateway on the left wing bypasses the track rise through the top rock formation near the track rise and connects to the haulage rise.

[0009] S3. In the mining area, the longwall faces along the strike are mined alternately from top to bottom, left and right. When mining the upper longwall face along the strike, the driving work of the lower longwall face along the strike is carried out simultaneously.

[0010] Preferably, the gob-side entry retaining technology is adopted, that is, the haulage gateway of the previous working face is used as the return airway of the next working face. At this time, only the haulage gateway of the next working face needs to be driven, and the return airway of the next working face is connected to the track rise through the U-shaped gateway connection roadway.

[0011] S4. The longwall faces along the strike on both wings of the mining area are divided into a paste filling area near the mining area rise and a longwall mining area far from the mining area rise. For the longwall mining area, the full caving method is used for mining, and for the paste filling area, the paste filling method is used for filling mining.

[0012] Preferably, the completion time of the mining and filling work in the paste filling area is earlier than the completion time of the mining work in the longwall mining area.

[0013] Preferably, in the paste filling area, the inclined gateway working faces are arranged in sequence along the strike. The gateway mining is realized by driving a roadheader for coal mining. The mining method of mining one and leaving one at intervals is adopted, that is, after each gateway working face is mined, one gateway working face is left as a temporary coal pillar for support, and the paste filling is carried out immediately after each gateway working face is mined; then the gateway working faces left as temporary support coal pillars are mined one by one, and the paste filling is carried out immediately after mining; the right boundary line of the paste filling area on the left wing is the track rise, and the left boundary line of the paste filling area on the right wing is the haulage rise, or a gateway working face is left between the paste filling area and the mining area rise as a permanent isolation coal pillar.

[0014] S5. Repeat steps S3 - S4 until the longwall faces along the strike in the entire mining area are mined out.

[0015] S6. The U-shaped gateway connection roadway is sealed off by a partition wall to cut off the connection between the U-shaped gateway connection roadway and other roadways; the h-shaped return airway connection roadway is sealed off by a partition wall so that it only connects the track rise and the return airway main roadway.

[0016] S7. The coal pillar of the mining area rise is arranged as an inclined dip working face. The original haulage rise is used as the haulage roadway of the coal pillar working face, the section of the original topmost return airway connecting the track rise and the haulage rise is used as the cutting eye of the coal pillar working face, and the original track rise is used as the return airway of the coal pillar working face. In this way, the coal pillar working face of the mining area rise is formed, and the full caving method is used to mine from top to bottom. At the same time, the gob-side entry retaining technology is adopted to retain the return airway of the coal pillar working face for air return.

[0017] Beneficial effects: The present invention uses the gob-side entry retaining technology to solve the problem of remaining coal pillars between working faces. At the same time, paste filling areas are arranged closely along the upper part of the mining area on both wings of the mining area, so that when recovering the coal pillars in the upper part of the mining area, it does not form an isolated working face, and the coal pillars in the upper part of the mining area can be recovered immediately after the longwall working faces on both wings are mined, realizing pillarless mining of the entire mining area. In addition, the present invention creatively gives a mining plan for the coal pillars in the upper part of the mining area. The upper part of the mining area is arranged in the coal seam and closely adjacent to the paste filling area. No coal pillars need to be left on both sides of the upper part of the mining area, only between them. The transportation roadway and the track roadway are used as the transportation roadway and the return airway respectively when mining the coal pillars in the upper part of the mining area. Then, in combination with the gob-side entry retaining technology, a ventilation plan of two intakes and one return is adopted, greatly saving the roadway driving workload and improving the mining recovery rate of the mining area. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the mining period of the longwall working faces on both wings of the direct mining method of the coal pillars in the upper part of the mining area of the present invention;

[0019] Figure 2 It is a schematic diagram of the layout of the working face of the coal pillars in the upper part of the mining area of the direct mining method of the coal pillars in the upper part of the mining area of the present invention;

[0020] Figure 3 It is a schematic diagram of the mining period of the working face of the coal pillars in the upper part of the mining area of the direct mining method of the coal pillars in the upper part of the mining area of the present invention;

[0021] In the figure: the main haulage roadway 1, the return airway 2, the transportation roadway 3, the track roadway 4, the return air connection roadway 5, the transportation crossheading 6, the return crossheading 7, the cut 8, the U-shaped crossheading connection roadway 9, the longwall working face 10, the longwall mining area 11, the paste filling area 12, the stop line 13, the filling demarcation line 14, the roadway mining working face 15, the goaf 16;

[0022] The working face A1 of the coal pillars in the upper part of the mining area, the transportation roadway A2 of the coal pillar working face, the cut A3 of the coal pillar working face, the return airway A4 of the coal pillar working face, the sealing partition wall A5. Detailed Embodiments

[0023] The technical solutions of the present invention will be described in more detail below with reference to the drawings in the embodiments of the present invention.

[0024] As Figures 1-3 shown, a direct mining method for the coal pillars in the upper part of the mining area of the residual coal resources based on paste filling includes the following steps:

[0025] S1, arrange a number of mining areas ([[]] Figure 1(Only one mining area is schematically shown in the figure), the mining area adopts a two-wing layout method, that is, the mining area crosscuts are arranged along the dip in the middle of the strike of the mining area. The mining area crosscuts include the transportation crosscut 3 on the right side arranged in the coal seam and the track crosscut 4 on the left side. The lower parts of the transportation crosscut 3 and the track crosscut 4 are connected to the main transportation roadway 1, and the upper parts are connected to the return airway 2;

[0026] Preferably, the mining area crosscuts are connected to the return airway 2 through the h-shaped return airway connection roadway 5.

[0027] S2, the transportation roadway 6 and the return airway 7 are driven in the coal seam along the strike within the left and right wings of the mining area, and the cutting roadway 8 is used to connect the two. The other end of the transportation roadway 6 is connected to the transportation crosscut 3, and the other end of the return airway 7 is connected to the track crosscut 4. The other end of the transportation roadway 6 is simultaneously connected to the track crosscut 4 through the U-shaped roadway connection roadway 9 to form the longwall face 10;

[0028] Preferably, the left side of the U-shaped roadway connection roadway 9 is connected upward from the track crosscut 4 to the transportation roadway 6 on the left wing, and the right side of the U-shaped roadway connection roadway 9 bypasses the transportation crosscut 3 through the bottom rock stratum from the track crosscut 4 and is connected to the transportation roadway 6 on the right wing.

[0029] Preferably, the transportation roadway 6 on the left wing bypasses the track crosscut 4 through the rock stratum at the top and is connected to the transportation crosscut 3 near the track crosscut 4.

[0030] S3, the longwall face 10 in the mining area is mined alternately from top to bottom on the left and right. When the upper longwall face 10 is mined, the driving work of the lower longwall face 10 is carried out simultaneously;

[0031] Preferably, the gob-side entry retaining technology is adopted, that is, the transportation roadway of the previous working face is used as the return airway of the next working face. At this time, only the transportation roadway 6 of the next working face needs to be driven, and the return airway 7 of the next working face is connected to the track crosscut 4 through the U-shaped roadway connection roadway 9.

[0032] S4, the longwall faces 10 on both wings of the mining area are divided into the paste filling area 12 near the mining area crosscuts and the longwall mining area 11 far from the mining area crosscuts (see the demarcation position in Figure 1 Figure 14), for the longwall mining area 11, the full caving method is adopted for mining, and for the paste filling area 12, the paste filling method is adopted for filling and mining;

[0033] Preferably, the completion time of the mining and filling work in the paste filling area 12 is earlier than the completion time of the mining work in the longwall mining area 11.

[0034] Preferably, inclined roadway mining faces 15 are arranged in sequence along the strike in the paste filling area 12. Roadway mining is realized by using a roadheader for coal mining. First, alternate mining is carried out, that is, after each roadway mining face 15 is mined, a roadway mining face 15 is left as a temporary coal pillar for support, and paste filling is immediately carried out after each roadway mining face 15 is mined; then, the roadway mining faces 15 left as temporary support coal pillars are mined one by one, and paste filling is immediately carried out after mining; finally, paste filling bodies are formed in the paste filling areas 12 on both sides of the district rise. The boundary line on the right side of the left-wing paste filling area is the track rise 4, and the boundary line on the left side of the right-wing paste filling area is the haulage rise 3, that is, the stop line 13 of the longwall face 10 along the strike is the district rise, or a roadway mining face is left between the paste filling area 12 and the district rise as a permanent isolation coal pillar (about 4-5 meters wide).

[0035] S5. Repeat steps S3 - S4 until the longwall face 10 along the strike of the entire district is mined out; at this time, only the district rise coal pillar remains in the district, which is also the coal resource abandoned in the existing district layout;

[0036] S6. Seal the U-shaped crossheading connection roadway 9 with a partition wall A5 to cut off the connection between the U-shaped crossheading connection roadway 9 and other roadways; seal the h-shaped return air connection roadway 5 with a partition wall A6 so that it only communicates with the track rise 4 and the return airway 2;

[0037] S7. Arrange the district rise coal pillar as an inclined dipping face. Use the original haulage rise 3 as the haulage roadway A2 of the coal pillar face, use the section of the original uppermost return airway 7 connecting the track rise 4 and the haulage rise 3 as the cutting face A3 of the coal pillar face, and use the original track rise 4 as the return airway A4 of the coal pillar face. Thus, a coal pillar face A1 of the district rise is formed, and it is mined from top to bottom by the fully caving method. At the same time, the gob-side entry retaining technology is used to retain the return airway A4 of the coal pillar face for air return.

[0038] When conducting the longwall face 10 mining in the two wings of the mining area, the coal transportation path is as follows: The coal mined in the mining area is transported out through the transportation gateway 6, the transportation rise 3, and the main haulage roadway 1; The paths for pedestrians and material transportation are as follows: For the uppermost longwall face, it enters the mining area through the main haulage roadway 1, the track rise 4, and the return airway 7. For the remaining longwall faces, it enters the mining area through the main haulage roadway 1, the track rise 4, the U-shaped gateway connection roadway 9, and the return airway 7; The ventilation path is as follows: For the uppermost longwall face, fresh air enters the mining area through the main haulage roadway 1, the track rise 4, the U-shaped gateway connection roadway 9, and the transportation gateway 6, and then becomes turbid air, which is discharged through the return airway 7, the return airway connection roadway 5, and the return airway 2; For the remaining longwall faces, fresh air enters the mining area through the main haulage roadway 1, the track rise 4, the U-shaped gateway connection roadway 9, and the transportation gateway 6, and then becomes turbid air, which is discharged through the return airway 7, the U-shaped gateway connection roadway 9, the track rise 4, the return airway connection roadway 5, and the return airway 2;

[0039] When conducting the mining of the coal pillar face A1 in the mining area rise, the coal transportation path is as follows: The coal mined in the mining area directly enters the main haulage roadway 1 through the coal pillar face transportation roadway A2; The paths for pedestrians and material transportation are as follows: Enter the mining area through the main haulage roadway 1 and the coal pillar face return airway A4; The ventilation path is as follows: Fresh air enters the mining area through the main haulage roadway 1, the coal pillar face transportation roadway A2, and the coal pillar face return airway A4, and then becomes turbid air, which is discharged through the gob-side entry retaining part of the coal pillar face return airway A4, the return airway connection roadway 5, and the return airway 2;

[0040] During ventilation, the direction and diameter of the air path are changed by means well-known in the art such as setting air doors and air windows, and local ventilation is carried out by setting fans.

[0041] Although the present invention has been described in detail with general descriptions and specific embodiments above, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. A method for directly mining the upper coal pillar in the goaf area of residual coal resources based on paste filling, characterized in that, It includes the following steps: S1. A number of mining areas are arranged in sequence along the strike between the main haulage roadway and the return airway arranged along the strike. The mining areas adopt a two-wing layout method, that is, the mining area crosscuts are arranged along the dip in the middle of the strike of the mining area. The mining area crosscuts include a haulage crosscut arranged on the right side in the coal seam and a track crosscut arranged on the left side. The lower parts of the haulage crosscut and the track crosscut are connected to the main haulage roadway, and the upper parts of the haulage crosscut and the track crosscut are connected to the return airway; S2. The haulage roadway and the return airway are driven in the coal seam along the strike in the left and right wings of the mining area, and the two are connected by a cutting roadway. The other end of the haulage roadway is connected to the haulage crosscut, and the other end of the return airway is connected to the track crosscut. The other end of the haulage roadway is simultaneously connected to the track crosscut through a U-shaped roadway connection roadway to form a longwall working face along the strike; S3. The longwall working face along the strike in the mining area is mined alternately from top to bottom on the left and right. When the upper longwall working face along the strike is mined, the driving work of the lower longwall working face along the strike is carried out simultaneously; S4. The longwall working faces along the strike in the two wings of the mining area are divided into a paste filling area close to the mining area crosscut and a longwall mining area far from the mining area crosscut. For the longwall mining area, the full caving method is used for mining, and for the paste filling area, the paste filling method is used for filling and mining; S5. Repeat steps S3 - S4 until the longwall working faces along the strike in the entire mining area are mined out; S6. Use a sealing partition wall to seal the U-shaped roadway connection roadway to cut off the connection between the U-shaped roadway connection roadway and other roadways; use a sealing partition wall to seal the h-shaped return airway connection roadway so that it only connects the track crosscut and the return airway; S7. Arrange the coal pillar of the mining area crosscut as a dip inclined working face. Use the original haulage crosscut as the haulage roadway of the coal pillar working face, use the section of the original topmost return airway connecting the track crosscut and the haulage crosscut as the cutting roadway of the coal pillar working face, and use the original track crosscut as the return airway of the coal pillar working face. In this way, a coal pillar working face of the mining area crosscut is formed, and it is mined from top to bottom using the full caving method. At the same time, the gob-side entry retaining technology is used to retain the return airway of the coal pillar working face for ventilation.

2. The method for directly mining the coal pillar in the district rise according to claim 1, characterized in that In step S1, the mining area crosscut is connected to the return airway through an h-shaped return airway connection roadway.

3. The method for directly mining the coal pillar in the district upcast according to claim 1, characterized in that In step S2, the left side of the U-shaped roadway connection roadway is connected upward from the track crosscut to the haulage roadway on the left wing, and the right side of the U-shaped roadway connection roadway bypasses the haulage crosscut through the bottom rock stratum from the track crosscut and is connected to the haulage roadway on the right wing.

4. The method for directly mining the coal pillar in the district rise according to claim 1 or 3, characterized in that, In step S2, the haulage roadway on the left wing bypasses the track crosscut through the top rock stratum and is connected to the haulage crosscut near the track crosscut.

5. The method for directly mining the upper mountain coal pillar in the mining area according to claim 1, characterized in that, In step S3, the gob-side entry retaining technology is adopted, that is, the haulage roadway of the previous working face is used as the return airway of the next working face. At this time, only the haulage roadway of the next working face needs to be driven, and the return airway of the next working face is connected to the track crosscut through a U-shaped roadway connection roadway.

6. The method for directly mining the coal pillar in the district rise according to claim 1, characterized in that, The completion time of the mining and filling work in the paste filling area is earlier than the completion time of the mining work in the longwall mining area.

7. The method for directly mining the upper panel coal pillar in a mining area according to claim 1 or 6, characterized in that, In the paste filling area, inclined roadway mining faces are arranged successively along the strike. Roadway mining is realized by using a roadheader for coal mining. First, mining is carried out with one mined and one left in an interval, that is, after each roadway mining face is mined, a roadway mining face is left as a temporary coal pillar for support, and paste filling is carried out immediately after each roadway mining face is mined; then, the roadway mining faces left as temporary support coal pillars are mined one by one, and paste filling is carried out immediately after mining; the boundary line on the right side of the left-wing paste filling area is the track rise, and the boundary line on the left side of the right-wing paste filling area is the haulage rise, or a roadway mining face is left between the paste filling area and the district rise as a permanent isolation coal pillar.

Images