A full mining method for gob coal resources in a mining area with paste partial backfilling

Abstract

The present invention relates to a full mining method for gob coal resources with paste local filling. The technique of gob-side entry retaining is adopted to solve the problem of remaining coal pillars between working faces. Meanwhile, a paste filling area is arranged closely along the haulage rise in the right wing of the mining area, so that the recovery of the coal pillar in the mining area rise does not form an isolated working face, and the coal pillar in the mining area rise can be recovered immediately after the longwall working faces in both wings are mined, realizing pillarless mining of the entire mining area. In addition, the present invention creatively provides a mining plan for the coal pillar in the mining area rise. The haulage rise is arranged in the coal seam and closely adjacent to the paste filling area, and no coal pillar needs to be left on the right side of the haulage rise, which will be used as the haulage roadway during the recovery of the coal pillar in the mining area rise; the track rise is arranged in the floor rock stratum of the coal seam, connecting the return airway of the coal pillar working face in the mining area rise formed by gob-side entry driving in the later stage to form a return air path, greatly saving the roadway driving workload.

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 achieving full mining of coal bodies in a mining area by using paste for partial 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 plurality of neatly planned longwall faces are arranged in a mining area. Therefore, the service life of the mining area rises is relatively long, and protective coal pillars are left to reduce the impact of the mining of the longwall faces on both wings on the mining area rises, 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. Moreover, since the coal pillar of the mining area rise is an isolated working face with goafs on both sides, it is difficult to mine due to the influence of mine pressure. Currently, the partial mining method is mainly used, 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 full mining method for the remaining coal resources in a mining area with paste partial 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, mining area rises along the dip are arranged in the middle of the strike of the mining area. The mining area rises include a haulage rise on the right side and a track rise 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; among them, the track rise is arranged in the rock stratum at the bottom of the coal seam, and the haulage rise is arranged in the coal seam;

[0005] Preferably, the main haulage roadway and the main return airway are arranged in the rock stratum.

[0006] Preferably, the mining area rise is connected to the main return airway through an H-shaped return air connection roadway.

[0007] S2. In the left and right wings of the mining area, a haulage heading and a return air heading are driven in the coal seam along the strike, and a cutting roadway 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 face;

[0008] Preferably, the left side of the U-shaped crossheading connects from the track rise to the upper top and then to the left-wing haulage gateway, and the right side of the U-shaped crossheading connects from the track rise to the upper top and then to the right-wing haulage gateway.

[0009] Preferably, the uppermost return airway extends downward to the rock formation near the track rise, that is, it gradually slopes downward from the coal seam to the track rise to form a connection.

[0010] S3. In the mining area, the longwall working faces are mined alternately from top to bottom, left and right. When mining the upper longwall working face, the driving work of the lower longwall working face is carried out simultaneously.

[0011] 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 crossheading.

[0012] S4. For the left-wing longwall working face, the full caving method is adopted for mining; for the right-wing longwall working face, it is 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 adopted for mining, and for the paste filling area, the paste filling method is used for filling and mining.

[0013] Preferably, the completion time of the mining and filling work in the paste filling area is earlier than that of the mining work in the longwall mining area.

[0014] Preferably, in the paste filling area, the inclined roadway mining working faces are arranged in sequence along the strike. The roadheader is used for driving and coal mining to realize roadway mining. The mining is carried out in a way of mining one and leaving one at intervals, that is, after each roadway mining working face is mined, one roadway mining working face is left as a temporary coal pillar for support, and the paste filling is carried out immediately after each roadway mining working face is mined; then the roadway mining working faces left as temporary support coal pillars are mined one by one, and the paste filling is carried out immediately after mining; the left boundary line of the paste filling area is the haulage rise, or a roadway mining working face is left between the paste filling area and the haulage rise as a permanent isolation coal pillar.

[0015] S5. Repeat steps S3 - S4 until the mining of all the longwall working faces in the mining area is completed.

[0016] S6. The U-shaped crossheading is sealed off with a partition wall to cut off the connection between the U-shaped crossheading and other roadways; the h-shaped return airway connection is sealed off with a partition wall so that it only communicates the track rise and the return airway main roadway.

[0017] Preferably, the part of the filling haulage gateway / return airway located within the coal pillar section of the mining area rise.

[0018] S7. Arrange the upcast coal pillar in the mining area as an inclined longwall working face. Use the original haulage upcast as the haulage roadway of the coal pillar working face. Drive the cutting eye of the coal pillar working face horizontally to the left from the upper part of the haulage roadway of the coal pillar working face, and then drive along the goaf along the left-wing stopping line downward to form the return airway of the coal pillar working face. Drive the return airway connecting roadway of the coal pillar working face at the bottom of the return airway of the coal pillar working face to connect with the original track upcast to form the upcast coal pillar working face in the mining area, and adopt the full caving method to carry out mining from top to bottom.

[0019] Advantages: 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, a paste filling area is arranged closely adjacent to the haulage upcast on the right wing of the mining area, so that the upcast coal pillar in the mining area does not become an isolated working face during recovery, and the upcast coal pillar in the mining area can be recovered immediately after the extraction of the longwall working faces on both wings, realizing pillarless mining in the entire mining area. In addition, the present invention creatively provides a recovery plan for the upcast coal pillar in the mining area. The haulage upcast is arranged in the coal seam and closely adjacent to the paste filling area, and no coal pillar needs to be left on the right side of the haulage upcast, which will be used as the haulage roadway during the recovery of the upcast coal pillar in the mining area later; the track upcast is arranged in the floor rock stratum of the coal seam and connected to the return airway of the upcast coal pillar working face formed by later gob-side entry driving to form a return air path, greatly saving the roadway driving workload. Even if the later track upcast is affected by mining, it only needs to be used as a return air passage and does not require further maintenance. Description of the Drawings

[0020] Figure 1 is a schematic diagram of the extraction period of the longwall working faces on both wings of the full extraction method for the mining area of the present invention;

[0021] Figure 2 is a schematic diagram of the layout of the upcast coal pillar working face in the full extraction method for the mining area of the present invention;

[0022] In the figure: haulage main roadway 1, return air main roadway 2, haulage upcast 3, track upcast 4, return airway connecting roadway 5, haulage roadway 6, return airway 7, cutting eye 8, U-shaped roadway connecting roadway 9, longwall working face 10, longwall extraction area 11, paste filling area 12, stopping line 13, filling demarcation line 14, roadway mining working face 15, goaf 16;

[0023] Upcast coal pillar working face A1 in the mining area, haulage roadway A2 of the coal pillar working face, cutting eye A3 of the coal pillar working face, return airway A4 of the coal pillar working face, return airway connecting roadway A5 of the coal pillar working face, sealing partition wall A6. Detailed Embodiments

[0024] 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. As Figure 1-2 shown, a full extraction method for the mining area of residual coal resources with partial paste filling includes the following steps:

[0025] S1. Along the strike, several mining areas are arranged in sequence between the haulage gateway 1 and the return airway 2 arranged along the strike ( Figure 1 only one mining area is shown in the figure). The mining area adopts a two-wing layout method, that is, the mining area rise is arranged along the dip in the middle of the strike of the mining area. The mining area rise includes the haulage rise 3 on the right side and the track rise 4 on the left side; the lower parts of the haulage rise 3 and the track rise 4 are connected to the haulage gateway 1, and the upper parts are connected to the return airway 2; among them, the track rise 4 is arranged in the rock stratum at the bottom of the coal seam, and the haulage rise 3 is arranged in the coal seam;

[0026] Preferably, the haulage gateway 1 and the return airway 2 are arranged in the rock stratum.

[0027] Preferably, the h-shaped return airway connection roadway 5 is used to connect the mining area rise and the return airway 2.

[0028] S2. In the left and right wings of the mining area, the haulage roadway 6 and the return airway 7 are driven in the coal seam along the strike, and the open-off cut 8 is used to connect the two. The other end of the haulage roadway 6 is connected to the haulage rise 3, and the other end of the return airway 7 is connected to the track rise 4. The other end of the haulage roadway 6 is simultaneously connected to the track rise 4 through the U-shaped roadway connection roadway 9 to form a longwall face 10 along the strike;

[0029] Preferably, the left side of the U-shaped roadway connection roadway 9 is connected from the track rise 4 to the top of the upper part and then to the left-wing haulage roadway 6, and the right side of the U-shaped roadway connection roadway 9 is connected from the track rise 4 to the top of the upper part and then to the right-wing haulage roadway 6.

[0030] Preferably, the uppermost return airway 7 extends to the rock stratum at the bottom near the track rise 4, that is, it gradually slopes down from the coal seam to the track rise 4 to form a connection.

[0031] S3. In the mining area, the longwall face 10 along the strike is mined alternately from top to bottom on the left and right. When the upper longwall face 10 along the strike is mined, the driving work of the lower longwall face 10 along the strike is carried out simultaneously;

[0032] Preferably, 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 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 rise 4 through the U-shaped roadway connection roadway 9.

[0033] S4. For the longwall face 10 on the left wing, the full caving method is adopted for mining until it is mined to the designed stop line 13; the stop line 13 on the left wing is the left boundary of the protective coal pillar of the mining area rise, and the position of this stop line 13 is determined according to the maintenance requirements of the track rise 4;

[0034] For the right - wing long - wall working face 10, it is divided into a paste - filling area 12 near the district rise and a long - wall mining area 11 far from the district rise. For the long - wall mining area 11, the full caving method is used for mining, and for the paste - filling area 12, the paste - filling method is used for filling and mining;

[0035] Preferably, the completion time of the mining and filling work in the paste - filling area 12 is earlier than that of the mining work in the long - wall mining area 11.

[0036] Preferably, in the paste - filling area 12, inclined roadway mining faces 15 are arranged in sequence along the strike. The roadheader is used for tunneling and coal mining to achieve roadway mining. The method of mining one and leaving one at intervals is adopted, that is, after each roadway mining face 15 is mined, one roadway mining face 15 is left as a temporary coal pillar for support. Immediately after each roadway mining face 15 is mined, paste filling is carried out; then the roadway mining faces 15 left as temporary support coal pillars are mined one by one, and paste filling is carried out immediately after mining; finally, a paste - filled body is filled in the paste - filling area 12 on the right side of the district rise. The left - hand boundary line of the paste - filling area is the haulage rise 3, or a roadway mining face is left as a permanent isolation coal pillar (about 4 - 5 meters wide) between the paste - filling area 12 and the haulage rise 3.

[0037] S5. Repeat steps S3 - S4 until the entire long - wall working face 10 of the district is mined; at this time, only the district rise coal pillar remains, which is also the coal resource abandoned in the existing district layout;

[0038] S6. Use the partition wall A6 to seal off the U - shaped crossheading connection roadway 9 to cut off the connection between the U - shaped crossheading connection roadway 9 and other roadways; use the partition wall A6 to seal off the h - shaped return air connection roadway 5 so that it only connects the track rise 4 and the return airway 2;

[0039] Preferably, the part of the filling haulage roadway / return airway located in the district rise coal pillar section;

[0040] S7. Arrange the district rise coal pillar as an inclined long - wall working face. Use the original haulage rise 3 as the haulage roadway A2 of the coal - pillar working face. Drive the coal - pillar working face cutting eye A3 from the upper part of the haulage roadway A2 of the coal - pillar working face to the left, and then drive along the goaf along the left - wing stopping line 13 downward to form the return airway A4 of the coal - pillar working face. Drive the return - air connection roadway A5 of the coal - pillar working face at the bottom of the return airway A4 of the coal - pillar working face to connect with the original track rise 4. In this way, the district rise coal - pillar working face A1 is formed, and the full caving method is used to mine from top to bottom.

[0041] When the longwall face 10 on both wings of the mining area is in extraction, the coal transportation path is as follows: The coal mined in the extraction area is transported out through the transportation gateway 6, the transportation rise 3, and the main haulage roadway 1; The paths for personnel and material transportation are as follows: For the uppermost longwall face, it enters the extraction area through the main haulage roadway 1, the track rise 4, and the return airway 7. For the remaining longwall faces, they enter the extraction 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 extraction 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 connection roadway 5, and the main return airway 2; For the remaining longwall faces, fresh air enters the extraction 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 connection roadway 5, and the main return airway 2;

[0042] When the coal pillar face A1 in the mining area rise is in extraction, the coal transportation path is as follows: The coal mined in the extraction area directly enters the main haulage roadway 1 through the coal pillar face transportation roadway A2; The paths for personnel and material transportation are as follows: Through the main haulage roadway 1, the track rise 4, the coal pillar face return connection roadway A5, and the coal pillar face return airway A4 to enter the extraction area; The ventilation path is as follows: Fresh air enters the extraction area through the main haulage roadway 1 and the coal pillar face transportation roadway A2, and then becomes turbid air, which is discharged through the coal pillar face return airway A4, the coal pillar face return connection roadway A5, the track rise 4, the return connection roadway 5, and the main return airway 2;

[0043] 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.

[0044] Although the present invention has been described in detail above with general descriptions and specific embodiments, 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 full mining method for goaf coal resources in a mining area with paste local 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, 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 on the right side and a track rise 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 return airway; among them, the track rise is arranged in the rock stratum at the bottom of the coal seam, and the haulage rise is arranged in the coal seam; S2. A haulage roadway and a return airway are driven in the coal seam along the strike in the left and right wings of the mining area, and a cutting roadway is used to connect the two. The other end of the haulage roadway is connected to the haulage rise, and the other end of the return airway is connected to the track rise. The other end of the haulage roadway is simultaneously connected to the track rise through a U-shaped roadway connection roadway to form a longwall face along the strike; S3. The longwall faces along the strike in the mining area are mined alternately from top to bottom, left and right. When the upper longwall face along the strike is mined, the driving work of the lower longwall face along the strike is carried out simultaneously; S4. For the longwall face on the left wing, the full caving method is used for mining; for the longwall face on the right wing, it is 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 and mining; S5. Repeat steps S3 - S4 until the longwall faces along the strike in the entire mining area are mined; S6. A partition wall is used to seal the U-shaped roadway connection roadway to cut off the connection between the U-shaped roadway connection roadway and other roadways; a partition wall is used to seal the h-shaped return airway connection roadway so that it only connects the track rise and the return airway; S7. The coal pillar of the mining area rise is arranged as a longwall face along the dip. The original haulage rise is used as the haulage roadway of the coal pillar face. A cutting roadway of the coal pillar face is driven leftward from the upper part of the haulage roadway of the coal pillar face, and then a gob-side entry driving is carried out downward along the goaf line on the left wing to form a return airway of the coal pillar face. A return airway connection roadway of the coal pillar face is driven at the bottom of the return airway of the coal pillar face to connect to the original track rise to form a coal pillar face of the mining area rise, and the full caving method is used for mining from top to bottom.

2. The full mining method for a mining area according to claim 1, wherein In step S1, the mining area rise is connected to the return airway through an h-shaped return airway connection roadway.

3. The full mining method for a mining area according to claim 1, characterized in that, In step S2, the left side of the U-shaped roadway connection roadway is connected from the track rise upward to the top and then to the haulage roadway on the left wing, and the right side of the U-shaped roadway connection roadway is connected from the track rise upward to the top and then to the haulage roadway on the right wing.

4. The full mining method for a mining area according to claim 1 or 3, characterized in that, In step S2, the uppermost return airway extends to the rock stratum at the bottom near the track rise, that is, it gradually slopes downward from the coal seam to the track rise to form a connection.

5. The full-mining method for a 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 rise through a U-shaped roadway connection roadway.

6. The full mining method for a mining area according to claim 1, wherein 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 full mining method for 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 left boundary line of the paste filling area is the haulage rise, or a roadway mining face is left between the paste filling area and the haulage rise as a permanent isolation coal pillar.

8. The full mining method for a mining area according to claim 1, characterized in that, The part of the filling haulage roadway / return airway located within the coal pillar section of the district rise.

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