Realize the advancing continuous mining method without coal pillar in mining area

Abstract

The present application relates to the field of coal mining, especially to realize the mining area advancing type continuous no-pillar mining method. In the method, the advancing mining method is used to realize the no-pillar mining between the roadways by using the inner staggered roadway arrangement mode, the raise, the transportation main roadway and the air return main roadway are fully utilized, not only the roadway engineering quantity is saved, but also the roadway maintenance cost is reduced, the mining recovery rate of the mine is greatly improved, the deficiency of the traditional advancing mining is efficiently made up, and more choices are provided for the minefield mining.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of coal mining, in particular to a method for realizing continuous coal pillar-free mining in a mining area in an advancing mode. BACKGROUND

[0002] At present, most of the minefields in China are mined in a mining area mode, which is divided into an advancing mode and a retreating mode. The traditional retreating mode needs to excavate two roadways in advance, which has a long initial construction time, a slow production, and can easily cause tension between mining and excavation in the working face. In the advancing mode, the upper and lower crossheading can be excavated along with mining, and the working face and the roadway can be cut by a coal mining machine, which simplifies the excavation process, reduces the excavation equipment and cost, can understand the geological structure in the minefield in advance during the excavation, and can simultaneously perform the excavation and the mining, thereby greatly improving the mining efficiency, and the end equipment of the working face is relatively simple and does not need to consider the air leakage problem of the goaf.

[0003] In the underground mining in China, at least 20-40m protective coal pillars need to be reserved between the upramps and on both sides of the upramps, and 20-30m protective roadway pillars need to be reserved between the adjacent working faces. The traditional retreating mode is difficult to completely recover the protective coal pillars and the protective roadway pillars, and there is a great loss of coal.

[0004] To solve the above problems, the present application proposes to use the staggered horizon technology to realize the coal pillar-free mining between the working faces, use the gob-side entry retaining technology to realize the coal pillar-free mining between the main roadway and the upramps, and finally realize the advancing mode continuous coal pillar-free mining technology in the mining area. SUMMARY

[0005] In view of the above technical problems, the present application aims to provide a method for realizing continuous coal pillar-free mining in a mining area in an advancing mode, so as to solve the technical limitations in the existing coal mining field.

[0006] To achieve the above object, the present application adopts the following technical scheme:

[0007] a. In the middle of the minefield, the transport main roadway and the air return main roadway are arranged in parallel along the coal seam trend, the track upramp and the transport upramp are arranged in parallel along the coal seam inclination, the track upramp and the transport upramp are arranged with the connecting roadway therebetween, and the first mining working face is arranged at the upper boundary of the minefield;

[0008] b. The track upramp is used as the open-off cut of the first mining working face, the two connecting roadways between the upramps are used as the transport roadway and the air return roadway respectively, and the production system is formed;

[0009] c. The track upramp is arranged without the main roadway protective coal pillar along one side of the working face, the hydraulic support is directly arranged in the track upramp, and the track upramp is left along the gob by using the roof cutting and pressure releasing roadway or the wall building;

[0010] d. The first mining working face pushes through the transportation uphole, directly reports the section transportation uphole, and punches a sealing wall to block the air flow along the transportation uphole to the goaf;

[0011] e. The first mining working face continues to advance along the tendency to stoping, pre-excavates the return air roadway and the transportation roadway in front, and lays the goaf in the back with the air leakage prevention, while using the roadside filling technology to keep the two roadways;

[0012] f. When the first mining working face advances to the vicinity of the boundary protection coal pillar, whether to use the double back withdrawal channel technology is selected according to the mining and excavation tension relationship;

[0013] g. The return air roadway of the connection working face is arranged in the form of "internal staggered" under the goaf of the transportation roadway of the first mining working face, the transportation roadway is pre-excavated in the coal seam roof, the hydraulic support is moved to the track uphole, and the stoping process is the same as the aforementioned patent protection b, c, d, e, f.

[0014] h. The last working face of the upper mining area directly uses the transportation roadway as the working face air inlet and the transportation roadway, and the first mining working face of the lower mining area uses the return air roadway as the return air roadway;

[0015] i. According to the arrangement position of the air shaft, the transportation roadway is abandoned or kept, if the central parallel ventilation mode is used, the transportation roadway can be abandoned in sections, if the central split ventilation mode is used, the transportation roadway needs to be left along the goaf by using the roof cutting and pressure releasing roadway or masonry wall during the working face advancing process, to continue to serve the connection mining area.

[0016] According to the method, preferably, the method is suitable for complete recovery of the protection coal pillars between the upholes and on both sides of the upholes and the working face protection roadway pillars, and realizes the continuous coal pillar-free mining method of the advancing mining area.

[0017] Specifically, in step a, during the preparation of the mining area, the transportation roadway and the return air roadway are excavated in the middle of the mining area to divide the stage, in the stage, the transportation uphole and the track uphole are connected with the stage roadway, the transportation uphole and the track uphole are connected, the first mining working face is arranged at the upper boundary of the stage, the transportation uphole is used as the open-off cut of the first mining working face, and a production system is formed, the last working face at the upper part of the stage uses the transportation roadway as the working face transportation roadway, and the last working face at the lower part of the stage uses the return air roadway as the section return air roadway; and the return air roadway is communicated with the section transportation roadway to form a production system.

[0018] In step b, during the initial stage of the working face, the working face is excavated, and the transportation roadway and the return air roadway do not need to be pre-excavated.

[0019] In step c, the transportation uphole is not kept during the initial mining of the working face, and a sealing wall needs to be punched after the working face pushes through the transportation uphole to block the air flow along the transportation uphole to the goaf.

[0020] In step d, the working face is pushed forward until the mining area boundary coal pillar is stopped, and the remaining transport roadway is used for moving;

[0021] In step e, the remaining working face in the upper part of the mining area is prepared for mining by using the transport uphole as a open-off cut, and the already mined transport uphole can be directly abandoned, and the track uphole is reserved by filling support for the working face return air route;

[0022] In step f, the last working face in the upper part of the mining area can use the transport roadway as the air inlet lane of the working face, and adopt the "Z" type ventilation mode for mining, and then the transport roadway is reserved by the gob-side entry retaining technology to continue to serve the lower mining area.

[0023] Compared with the prior art, the implementation method provided by the present application has the following advantages:

[0024] (1) The track uphole is used as the open-off cut, and the transport uphole is abandoned with the working face in sections, thereby saving the roadway excavation and maintenance cost.

[0025] (2) The last working face in the mining area uses the transport roadway as the transport roadway, and the first working face in the lower mining area uses the return air roadway as the return air roadway, thereby greatly improving the roadway utilization rate.

[0026] (3) The advancing mining does not need the two roadways to be completely excavated in advance, thereby reducing the capital investment for the early-stage roadway excavation; and the roadway is excavated while the working face is mined, thereby greatly relieving the problem of tight mining and excavation relationship.

[0027] (4) The coal pillar-free continuous mining is realized on both sides of the roadway, between the roadways, and between the working faces, and finally the coal pillar-free continuous mining is realized in the mining area.

[0028] (5) The connection working face transport roadway is in a low stress environment, the overburden is the caved gangue of the goaf, the working faces present the characteristics of continuous mining and overburden integration, the roadway load is reduced, and the stress concentration phenomenon of the adjacent roadway of the connection working face is avoided; at the same time, the influence of the long-term high stress of the uphole or roadway of the coal mine is improved, and the shaft engineering of the coal seam and the adjacent coal seam is completely liberated. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a working face arrangement diagram for the coal pillar recovery of the last working face in the existing mining area;

[0030] Figure 2 It is a working face arrangement diagram for the coal pillar recovery of the last working face in the existing mining area;

[0031] Figure 3 It is a working face arrangement diagram for the coal pillar recovery of the last working face in the existing mining area;

[0032] Among them, 1. Transport uphill; 2. Track uphill; 3. Return airway; 4. Transport main roadway; 5. Section return airway; 6. Upper section transport roadway; 7, 8, 9, 10, 11, 12. Sealed wall; 13. Air door; 14. Upper mining area yard; 15, 16, 17, 18. Middle mining area yard; 19. Filling wall; 20. Ventilation shaft; 21. Goaf; 22. Coal pillar. Detailed Implementation

[0033] Specific embodiments of the present invention will be described with reference to the accompanying drawings.

[0034] a. In the middle of the minefield, the main haulage roadway and return air roadway are arranged in parallel along the coal seam strike, and the track incline and haulage incline are arranged in parallel along the coal seam dip. A connecting roadway is arranged between the track incline and the haulage incline. The first mining face is located at the upper boundary of the minefield.

[0035] b. The track incline serves as the opening cut of the first mining face, and the two connecting roadways between the inclines serve as the transport roadway and the return air roadway, respectively, forming the production system;

[0036] c. No main roadway protective coal pillar is retained on one side of the working face along the track incline. The hydraulic support is directly set on the track incline. During mining, the roadway is formed by cutting the top to relieve pressure or building a wall to achieve the roadway retention along the track incline.

[0037] d. The first mining face is pushed over the transport uphill section, and the abandoned section is transported uphill directly, and a sealed wall is built to block the airflow from flowing uphill to the goaf.

[0038] e. The first mining face continues to advance along the dip for mining, and the return airway and transport roadway are pre-excavated forward. The goaf behind is covered with anti-air leakage cloth, and the two roadways are preserved by using the roadway side filling technology.

[0039] f. When the first mining face advances to the vicinity of the boundary protection coal pillar, the decision on whether to adopt the double retreat channel technology is made based on the mining tension.

[0040] g. The return airway of the subsequent working face is pre-excavated and arranged in an "internal staggered" manner below the goaf of the transport roadway of the first mining face. The transport roadway is pre-excavated and arranged on the roof of the coal seam. The hydraulic support is moved to the track and uphill. Its mining process is the same as that of the aforementioned patent protection rights b, c, d, e, and f.

[0041] h. The last working face in the upper mining area directly uses the main haulage roadway as the working face intake and haulage level roadway, while the first working face in the lower mining area uses the return air main roadway as the return air level roadway.

[0042] i. Depending on the location of the ventilation shaft, the main transport roadway may be scrapped or retained. If the zone adopts a central parallel ventilation method, the main transport roadway may be scrapped in sections. If a central split ventilation method is adopted, the main transport roadway may be retained along the goaf by cutting the top to relieve pressure or building walls during the working face advance, so as to continue to serve the subsequent mining area.

Claims

1. A method of advancing continuous mining without pillars in a mining area, characterized in that, The process comprises the following steps: Step a, in the middle of the mine field, along the coal seam strike and parallel arrangement of transport roadway and return air roadway, along the coal seam dip and parallel arrangement of track up and transport up, track up and transport up between the arrangement of liaison lane, the first mining face is arranged in the upper boundary of the mine field; Step b, track up as the first mining face open-off cut, two liaison lanes between the transport roadway and return air roadway, constitute the production system; Step c, track up along the side of the working face without retaining roadway protection coal pillar, hydraulic support is directly set in the track up, the initial stage of recovery by cutting roof pressure release or walling to realize track up along empty roadway; Step d, the first mining face push through the transport up, directly scrap section transport up and punch the airtight wall, to block the air flow along the transport up to the goaf flow; Step e, the first mining face continues to forward recovery, while forward driving return air lane and transport lane, using lane filling technology to retain two lane, working face behind by paving cloth to prevent air flow into the goaf; Step f, the first mining face to the boundary protection coal pillar, according to the mining tension relationship to choose whether to use double back channel technology; Step g, the track up to the transport up section of the connection working face, return air lane is pre-excavated in the first mining face transport lane goaf below with "inside staggered type", transport lane is pre-excavated in the coal seam roof, hydraulic support is directly moved to the track up, its subsequent working face recovery process is the same as the above steps b, c, d, e, f; Step h, the last working face of the upper mining area, directly using the transport roadway as the working face air intake, transport lane, the first mining face of the lower mining area using return air roadway as return air lane; Step i, according to the position of the air shaft, the transport roadway is scrapped or retained, if the central parallel ventilation mode is used in the mining area, the transport roadway can be scrapped in sections, if the central split ventilation mode is used, the transport roadway needs to be left along the empty roadway by cutting roof pressure release or walling during the working face advancing process, to continue to serve the subsequent mining area; In step d, the working face is pushed forward until the boundary coal pillar of the mining area, and the remaining transport lane is used for moving.

2. The advancing longwall mining method of a mining block according to claim 1, characterized in that, In step a, during the preparation of the mining area, the transport roadway and return air roadway are excavated in the middle of the mining area, during the stage, the transport up and track up are connected with the stage roadway, the transport up and track up are connected, the first mining face is arranged in the upper boundary of the stage, the transport up is used as the open-off cut of the first mining face, to constitute the production system, the last working face of the upper stage uses the transport roadway as the working face transport lane, and the last working face of the lower stage uses the return air roadway as the section return air lane.

3. The advancing longwall mining method of claim 1, wherein, In step b, during the initial mining stage of the working face, the transport lane and return air lane are excavated simultaneously without pre-excavation.

4. The advancing longwall mining method of claim 1, wherein, In step c, the transport up is not retained during the initial mining of the working face, and the airtight wall is punched after the working face pushes through the transport up, to block the air flow along the transport up to the goaf flow. In step c, the transport up is not retained during the initial mining of the working face, and the airtight wall is punched after the working face pushes through the transport up, to block the air flow along the transport up to the goaf flow.

5. The advancing longwall mining method of claim 1, wherein, In step e, the rest of the working face in the upper part of the mining area is prepared for mining as a transport uphole, and the already mined transport uphole is directly abandoned, while the track uphole is reserved for the working face return air route through filling support.

6. The advancing longwall mining method of a mining block according to claim 1, characterized in that, In step f, the last working face in the upper part of the mining area uses the transport roadway as the air inlet lane of the working face, and adopts a "Z" type ventilation mode for mining, and then the transport roadway is reserved through the gob-side entry retaining technology to continue to serve the lower mining area.

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