A method for arranging the bottom structure of a multi-layered stope along the strike of the ore body

Abstract

This invention belongs to the field of underground mining and relates to a method for arranging the bottom structure of a multi-layered stope along the strike of the ore body. The method includes the arrangement of primary mining drilling roadways, shared ore extraction roadways, peach-shaped pillars, primary mining cutting roadways, primary mining inclined roadways, secondary mining drilling roadways, and secondary mining cutting roadways. The technical solution of this application solves the problem of the inability to arrange a bottom structure in secondary mining areas; it allows secondary mining areas to have a bottom structure, improving ore extraction efficiency, shortening the mining cycle, resulting in cleaner ore extraction, reducing ore loss, minimizing the need for remote-controlled ore extraction, and reducing the risk of equipment burying.

Description

Technical Field

[0001] This invention belongs to the field of underground mining and relates to a method for arranging the bottom structure of a multi-layered stope along the strike of the ore body. Background Technology

[0002] Mining in a stope is divided into one-step, two-step, and three-step mining. After the one-step mining is completed, backfilling is carried out, followed by the two-step mining. Stope layout is generally either perpendicular to the ore body strike or along the ore body strike. For gently dipping ore bodies with large horizontal thickness, cross-cutting roadways are generally arranged perpendicular to the ore body, with panels arranged between the cross-cutting roadways. Stopes are then divided within each panel, and each stope is arranged along the ore body strike. Each stope is divided into multiple layers, employing a multi-layered mining method followed by backfilling. During stope mining, the bottom layer requires the installation of a bottom structure for ore extraction.

[0003] For stopes laid out along the ore body strike, generally, first-stage stopes have a bottom structure, including ore extraction roadways and four inclined roadways. Second-stage stopes cannot have a bottom structure. First-stage stopes mainly rely on ore extraction roadways and inclined roadways for ore extraction. Second-stage stopes, lacking a bottom structure, generally extract ore at the entrances of each layer of drilling roadways, and use remote-controlled loaders for remote extraction from the bottom drilling roadways. This approach has disadvantages:

[0004] 1) Low mining efficiency and long mining cycle result in long exposure time of the working hole, which can easily lead to the collapse of the working hole and the mixing of backfill.

[0005] 2) Remote control mining has a long distance, poor visual effect, and is difficult to mine, which may result in the incomplete mining and loss of ore.

[0006] 3) A large amount of ore is extracted remotely, which is risky. If the empty area collapses, the shovel and loader will be buried in the empty area and unable to get out. This will cause equipment damage and prevent the ore from being extracted, resulting in a loss of ore. Summary of the Invention

[0007] This application provides a method for arranging the bottom structure of a multi-layered stope along the strike of the ore body, solving the problem that a bottom structure cannot be arranged in a two-stage stope. This allows the two-stage stope to have a bottom structure, improving ore extraction efficiency, shortening the mining cycle, resulting in cleaner ore extraction, reducing ore loss, minimizing the need for remote-controlled ore extraction, and lowering the risk of equipment burying.

[0008] To achieve the above technical objectives, the technical solution adopted in this application is: a method for arranging the bottom structure of a multi-layered stope along the strike of the ore body, comprising:

[0009] Obtain the first and second exploration lines;

[0010] Between the first exploration line and the second exploration line, a first cross-vein tunnel is set up on the side closer to the first exploration line; a second cross-vein tunnel is set up on the side closer to the second exploration line.

[0011] A first-stage mining area and a second-stage mining area are arranged between the first exploration line and the second exploration line. Both the first-stage mining area and the second-stage mining area are perpendicular to the first exploration line and the second exploration line.

[0012] A shared ore extraction roadway for both the first-stage and second-stage mining areas is arranged at the intersection of the first-stage mining blast boundary and the second-stage mining blast boundary.

[0013] The bottom of the mining area is layered, and in the first-level mining area, a first-level mining drilling roadway, a first-level mining cutting roadway, and a first-level mining oblique crossing roadway are arranged.

[0014] Among them, the first-stage drilling tunnel is located on the side of the first-stage mining area away from the second-stage mining area, and the two ends of the first-stage drilling tunnel are connected to the first cross-vein tunnel and the second cross-vein tunnel, respectively.

[0015] The one-step cutting roadway is located between the first and second cross-vein roadways and is parallel to both the first and second cross-vein roadways.

[0016] There are two types of oblique cross-passages in one-step mining: the oblique cross-passage on the east side of one-step mining located between the cutting cross-passage and the first cross-vein cross-passage, and the oblique cross-passage on the west side of one-step mining located between the cutting cross-passage and the second cross-vein cross-passage. The two ends of the oblique cross-passages in one-step mining are connected to the drilling cross-passage and the shared ore extraction cross-passage, respectively.

[0017] After the first-stage mining and backfilling are completed, second-stage mining drilling tunnels, second-stage mining cutting tunnels and second-stage mining oblique crossing tunnels will be arranged in the second-stage mining area.

[0018] Among them, the second-step mining tunnel is located on the side of the second-step mining area away from the first-step mining area, and the two ends of the second-step mining tunnel are connected to the first through-vein tunnel and the second through-vein tunnel, respectively.

[0019] The two-step cutting roadway is located between the first and second cross-vein roadways and is parallel to both the first and second cross-vein roadways.

[0020] There are two types of oblique cross-passages in the two-step mining: the oblique cross-passage on the east side of the two-step mining, located between the cutting roadway and the first cross-vein roadway, and the oblique cross-passage on the west side of the two-step mining, located between the cutting roadway and the second cross-vein roadway. The two ends of the oblique cross-passages in the two-step mining are connected to the two-step mining drilling roadway and the shared ore extraction roadway, respectively.

[0021] Peach-shaped pillars are positioned between the first-stage and second-stage mining areas to protect the shared ore extraction roadway.

[0022] As an improved technical solution in this application, the distance between the first exploration line and the second exploration line is 100m.

[0023] As an improved technical solution in this application, the dimensions of the first-stage rock drilling tunnel are 4*3.5m, with a 1 / 3 three-center arch; the dimensions of the second-stage rock drilling tunnel are 4*3.5m, with a 1 / 3 three-center arch.

[0024] As an improved technical solution of this application, the dimensions of the first-stage mining cutting roadway are 4.8*4.2m, the waist height is 4m, and it has a circular arch; the dimensions of the second-stage mining cutting roadway are 4.8*4.2m, the waist height is 4m, and it has a circular arch.

[0025] As an improved technical solution in this application, the dimensions of the first-stage mining inclined tunnel are 4*3.5m, with a 1 / 3 three-center arch; there are 2 inclined tunnels on the east side and 2 inclined tunnels on the west side of the first-stage mining; the dimensions of the second-stage mining inclined tunnel are 4*3.5m, with a 1 / 3 three-center arch; there are 1 or 2 inclined tunnels on the east side and 1 or 2 inclined tunnels on the west side of the second-stage mining.

[0026] As an improved technical solution in this application, the distance between the east-side oblique tunnel or the west-side oblique tunnel of the first-step mining and the sidewall of the cutting tunnel of the first-step mining is 6m, and the included angle between the east-side oblique tunnel or the west-side oblique tunnel of the first-step mining and the drilling tunnel of the first-step mining is 40°.

[0027] As an improved technical solution of this application, the distance between the center lines of the two east-side oblique crossing roadways of the one-step mining is 15m; the distance between the center lines of the two west-side oblique crossing roadways of the one-step mining is 15m; the distance between the center lines of the two east-side oblique crossing roadways of the two two-step mining is 15m; and the distance between the center lines of the two west-side oblique crossing roadways of the two two-step mining is 15m.

[0028] As an improved technical solution in this application, the distance between the right sidewall of the first-stage mining tunnel and the right boundary of the mining area is 1m, and the distance between the left sidewall and the right sidewall of the shared bottom structure is 8m; the distance between the right sidewall of the second-stage mining tunnel and the left sidewall of the shared bottom structure tunnel is 8m.

[0029] As an improved technical solution in this application, the angle between the two sides of the peach-shaped pillar and the horizontal line is 50°.

[0030] Beneficial effects

[0031] (1) It gives the two-step mining area a bottom structure, improves the ore extraction efficiency, shortens the mining cycle of the two-step mining, and reduces the risk of collapse of the two-step mining goaf.

[0032] (2) Make it easier and cleaner to extract ore from the second-step mining site, and avoid loss of ore quantity;

[0033] (3) Reduce remote mining in the two-step mining area, reduce the risk of equipment being buried, reduce the impact of equipment burial on mining, and thus reduce economic losses. Attached Figure Description

[0034] Figure 1 Plan view of the bottom structure of the stope;

[0035] Figure 2 Bottom structure layout sectional view;

[0036] In the diagram, 1. West-side oblique tunnel of the first-stage mining area; 2. Blasting boundary of the first-stage mining area; 3. Cutting tunnel of the first-stage mining area; 4. East-side oblique tunnel of the first-stage mining area; 5. Name of the first-stage mining area; 6. Rock drilling tunnel of the first-stage mining area; 7. Name of the shared ore extraction tunnel; 8. Shared ore extraction tunnel; 9. Rock drilling tunnel of the second-stage mining area; 10. Name of the second-stage mining area; 11. East-side oblique tunnel of the second-stage mining area; 12. Cutting tunnel of the second-stage mining area; 13. Blasting boundary of the second-stage mining area; 14. West-side oblique tunnel of the second-stage mining area; 15. First exploration line; 16. Name of the first exploration line; 17. First through-vein tunnel; 18. Peach-shaped pillar; 19. Second exploration line; 20. Name of the second exploration line; 21. Second through-vein tunnel. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-2 The technical solution of this application is clearly and completely described. In the figure: 1. West oblique tunnel of the first-stage mining; 2. Blasting boundary of the first-stage mining; 3. Cutting tunnel of the first-stage mining; 4. East oblique tunnel of the first-stage mining; 5. Name of the first-stage mining stope; 6. Rock drilling tunnel of the first-stage mining; 7. Name of the shared ore extraction tunnel; 8. Rock drilling tunnel of the second-stage mining; 9. Name of the second-stage mining stope; 10. East oblique tunnel of the second-stage mining; 11. Cutting tunnel of the second-stage mining; 12. Blasting boundary of the second-stage mining; 13. West oblique tunnel of the second-stage mining; 14. First exploration line; 15. Name of the first exploration line; 16. First cross-vein tunnel; 17. Peach-shaped pillar; 18. Second exploration line; 19. Name of the second exploration line; 20. Second cross-vein tunnel; 21.

[0038] In this technical solution, all roadways are arranged at the bottom layer of the stope, including the arrangement of the first-stage drilling roadway 6, the common ore extraction roadway 8, the peach-shaped pillar 18, the first-stage cutting roadway 3, the first-stage inclined roadway, the second-stage drilling roadway 9, the second-stage cutting roadway 12, and the second-stage inclined roadway, as detailed below:

[0039] like Figure 1-2 As shown, a method for arranging the bottom structure of a multi-layered stope along the strike of the ore body includes...

[0040] Obtain the first exploration line 15 and the second exploration line 19;

[0041] Between the first exploration line 15 and the second exploration line 19, a first cross-cut tunnel 17 is set up on the side adjacent to the first exploration line 15, and a second cross-cut tunnel 21 is set up on the side adjacent to the second exploration line 19.

[0042] A first-stage mining area and a second-stage mining area are arranged between the first exploration line 15 and the second exploration line 19. Both the first-stage mining area and the second-stage mining area are perpendicular to the first exploration line 15 and the second exploration line 19.

[0043] A shared ore extraction roadway 8, used by both the first-stage mining area and the second-stage mining area, is arranged at the intersection of the first-stage mining blast boundary 2 and the second-stage mining blast boundary 13.

[0044] The bottom of the mining area is layered, and six drilling roadways, three cutting roadways, and one inclined roadway are arranged in the first-step mining area.

[0045] Among them, the first-stage drilling tunnel 6 is located on the side of the first-stage mining area away from the second-stage mining area, and the two ends of the first-stage drilling tunnel 6 are connected to the first through-vein tunnel 17 and the second through-vein tunnel 21, respectively.

[0046] The first-step cutting roadway 3 is located between the first cross-vein roadway 17 and the second cross-vein roadway 21, and is parallel to the first cross-vein roadway 17 and the second cross-vein roadway 21.

[0047] There are two types of oblique cross-passages in the first-step mining: the oblique cross-passage 4 on the east side of the first-step mining, located between the first-step mining cutting passage 3 and the first cross-vein passage 17, and the oblique cross-passage 1 on the west side of the first-step mining, located between the first-step mining cutting passage 3 and the second cross-vein passage 21; the two ends of the oblique cross-passages in the first-step mining are connected to the first-step mining drilling passage 6 and the shared ore extraction passage 8, respectively.

[0048] After the first-stage mining and backfilling are completed, the second-stage mining drilling roadway 9, the second-stage mining cutting roadway 12, and the second-stage mining inclined tunnel will be arranged in the second-stage mining area.

[0049] Among them, the second-step mining tunnel 9 is located on the side of the second-step mining area away from the first-step mining area, and the two ends of the second-step mining tunnel 9 are connected to the first through-vein tunnel 17 and the second through-vein tunnel 21 respectively.

[0050] The two-step cutting roadway 12 is located between the first through-vein roadway 17 and the second through-vein roadway 21, and is parallel to the first through-vein roadway 17 and the second through-vein roadway 21.

[0051] There are two types of oblique cross-passages in the two-step mining: the oblique cross-passage 11 on the east side of the two-step mining, located between the two-step mining cutting passage 12 and the first cross-vein passage 17, and the oblique cross-passage 14 on the west side of the two-step mining, located between the two-step mining cutting passage 12 and the second cross-vein passage 21. The two ends of the oblique cross-passages in the two-step mining are connected to the two-step mining drilling passage 9 and the shared ore extraction passage 8, respectively.

[0052] Peach-shaped pillar 18 is located between the first-stage and second-stage mining areas to protect the shared ore extraction roadway 8.

[0053] As an improved technical solution in this application, the distance between the first exploration line 15 and the second exploration line 19 is 100m.

[0054] Regarding one-step collection:

[0055] In some embodiments, the dimensions of the one-step drilling roadway 6 are 4*3.5m, with a 1 / 3 three-center arch. The right sidewall of the one-step drilling roadway 6 is 1m from the right boundary of the one-step mining area, and the left sidewall is 8m from the right sidewall of the shared bottom structure. This is because a shared ore extraction roadway needs to be arranged at the intersection of the blasting boundaries of the one-step and two-step mining areas, and peach-shaped pillars 18 need to be installed to protect the shared ore extraction roadway 8 and prevent it from being damaged.

[0056] The dimensions of the first-step cutting tunnel 3 are 4.8*4.2m, with a waist height of 4m and a circular arch, designed to accommodate the construction of the cutting well platform.

[0057] The first-step cutting roadway 3 is located between the first through-vein roadway 17 and the second through-vein roadway 21, and is parallel to both. This is to facilitate subsequent blasting at both ends for ore extraction, resulting in high ore extraction efficiency.

[0058] In some embodiments, the dimensions of the inclined tunnel in the first-step mining are 4*3.5m, with a 1 / 3 three-center arch; there are 2 inclined tunnels 4 on the east side of the first-step mining and 2 inclined tunnels 1 on the west side of the first-step mining.

[0059] In some embodiments, the distance between the east side oblique tunnel 4 or the west side oblique tunnel 1 of the one-step mining and the side wall of the cutting tunnel 3 of the one-step mining is 6m. The reason is that the ore in the empty area is mainly concentrated in the middle of the empty area, so the oblique tunnel should be close to the cutting tunnel, which is conducive to ore extraction, but it cannot be too close, otherwise the tunnel is prone to collapse and is not safe enough.

[0060] In some embodiments, the included angle between the east-side oblique tunnel 4 or the west-side oblique tunnel 1 and the drilling tunnel 6 in the first-step mining is 40°. This is to increase the length of the oblique tunnel, so that there is enough space to build a sealing wall after the subsequent mining is completed.

[0061] In some embodiments, the distance between the center lines of the two east-side oblique crossing roadways 4 of the one-step mining operation is 15m; the distance between the center lines of the two west-side oblique crossing roadways 1 of the one-step mining operation is 15m. The reason is that, on the one hand, it is to ensure that the oblique crossing roadways are evenly distributed, which is conducive to cleaner ore extraction; on the other hand, the distance between the east-side oblique crossing roadways 4 of the one-step mining operation should be more than 5.5m for safety.

[0062] In some embodiments, the right side of the first-stage drilling tunnel 6 (the side of the first-stage drilling tunnel 6 away from the second-stage mining area) is 1m away from the right boundary of the first-stage mining area, and the left side of the first-stage drilling tunnel 6 (the side of the first-stage drilling tunnel 6 adjacent to the second-stage mining area) is 8m away from the right side of the shared bottom structure.

[0063] Regarding the two-step sampling:

[0064] In some embodiments, the dimensions of the two-step mining tunnel 9 are 4*3.5m, with a 1 / 3 three-center arch. The two ends of the two-step mining tunnel 9 are connected to the first through-vein tunnel 17 and the second through-vein tunnel 21, respectively. In some embodiments, the right side of the two-step mining tunnel 9 (the side of the two-step mining tunnel 9 adjacent to the first-step mining area) is 8m away from the left side of the shared bottom structure tunnel. This is because a shared ore extraction tunnel 8 needs to be arranged at the intersection of the first-step mining blasting boundary 2 and the second-step mining blasting boundary 13, and peach-shaped pillars 18 need to be arranged to protect the shared ore extraction tunnel 8 and prevent it from being damaged.

[0065] In some embodiments, the two-step cutting roadway 12 has dimensions of 4.8*4.2m, a waist height of 4m, and a circular arch, designed to accommodate the construction of the cutting shaft trolley. This two-step cutting roadway 12 is located midway between the first through-cut roadway 17 and the second through-cut roadway 21, primarily to facilitate subsequent blasting at both ends for high ore extraction efficiency. The area within 2m of the right side of the two-step cutting roadway 12, from the boundary of the two-step mining area, is not excavated. This is because this 2m area is located within the shared ore extraction roadway 8 area, which is prone to collapse during the first-step mining phase. The top of the shared ore extraction roadway 8 is prone to significant collapse, and after backfilling, this area is filled with backfill material, making excavation of the backfill material unsafe. Therefore, for safety reasons, excavation is not permitted.

[0066] In some embodiments, the dimensions of the two-step mining oblique tunnel are 4*3.5m, 1 / 3 three-center arch, and the two-step mining east side oblique tunnel 11 can be selected as one or two according to the site conditions, and the two-step mining west side oblique tunnel 14 can be selected as one or two according to the site conditions.

[0067] In some embodiments, the distance between the center lines of the two east-side oblique crossing roadways 11 of the two two-step mining operations is 15m; the distance between the center lines of the two west-side oblique crossing roadways 14 of the two two-step mining operations is 15m. The reason is that, on the one hand, it is to ensure that the oblique crossing roadways are evenly distributed, which is conducive to cleaner ore extraction; on the other hand, the distance between the oblique crossings should be more than 5.5m for safety.

[0068] In some embodiments, the western oblique crossing roadway 14 of the second-step mining is 6m or more close to the sidewall of the second-step mining cutting roadway 12. The location can be appropriately offset from the oblique crossing of the first-step mining roadway, depending on the site lithology. This is because the backfilling process after the first-step mining is completed is relatively long, and the shared ore extraction roadway 8 is located inside the pillar between the first-step and second-step mining areas, making it susceptible to damage. For safety reasons, the position of the western oblique crossing roadway 14 of the second-step mining roadway needs to be adjusted according to the site conditions.

[0069] Regarding shared ore extraction tunnels:

[0070] In some embodiments, the shared ore extraction roadway 8 has dimensions of 4*3.5m and a 1 / 3 three-center arch. It connects to the first through-vein roadway 17 and the second through-vein roadway 21 at both ends. The shared ore extraction roadway 8 is located at the intersection of the primary mining blast boundary 2 and the secondary mining blast boundary 13. The shared ore extraction roadway 8 serves as both the primary and secondary mining ore extraction roadways; ore is extracted from both the primary and secondary mining areas through the shared ore extraction roadway 8, hence its location at the intersection of the blast boundaries of the two mining areas.

[0071] As an improved technical solution in this application, the angle between the two hypotenuses of the peach-shaped pillar 18 and the horizontal line is 50°. The function of the peach-shaped pillar 18 is to protect the common ore extraction roadway 8. The common ore extraction roadway 8 is arranged inside the peach-shaped pillar 18, and is located at the middle of the bottom of the peach-shaped pillar 18. The common ore extraction roadway is located in the exact middle of the peach-shaped pillar in the horizontal direction; and in the vertical direction, it is located at the bottom of the peach-shaped pillar.

[0072] Among them, the angle between the two sides of the peach-shaped pillar 18 and the horizontal line is 50°. The reason is that the natural angle of repose is 45°. The 50° arrangement is to ensure that the ore pile can slide down smoothly during subsequent mining, which is convenient for ore extraction.

[0073] Example 1

[0074] The 18221 and 18212 mining areas of a certain mine share a common bottom structure, with the bottom layer located at the -455m level and the bottom structure arranged at the -455m level.

[0075] The 18221 stope (one-step stope) is 15m wide, and the 18212 stope (two-step stope) is 18m wide. The stopes are located between the first exploration line 15 and the second exploration line 19, and are arranged perpendicular to both lines. The distance between the first and second exploration lines 15 is 100m. A bottom layer is established at -455m. A one-step drilling roadway 6 and a one-step cutting roadway 3 are arranged in the 18221 stope. An ore extraction roadway 8 is shared at the boundary between the 18221 and 18212 stopes. An ore extraction one-step oblique crossing roadway is also arranged in the 18221 stope for ore extraction.

[0076] After the backfilling of the 18221 mining area is completed, a two-step mining drilling roadway 9 and a two-step mining cutting roadway 12 will be arranged in the 18212 mining area. A two-step mining ore-exiting inclined roadway will be arranged at the location of the common ore-exiting roadway 8 for ore extraction in the 18212 mining area.

[0077] By sharing a bottom structure, the mining efficiency of the 18212 stope can be greatly improved, reducing the risk of goaf collapse; it makes ore extraction in the 18212 stope more convenient and cleaner, avoiding ore loss; it reduces the need for remote ore extraction in the 18212 stope, lowers the risk of equipment being buried, reduces the impact of buried equipment on ore extraction, and thus reduces economic losses.

Claims

1. A method for arranging the bottom structure of a multi-layered stope along the strike of the ore body, characterized in that, include Obtain the first and second exploration lines; Between the first exploration line and the second exploration line, the first cross-vein tunnel is set up on the side adjacent to the first exploration line; A second cross-cut tunnel is constructed on the side adjacent to the second exploration line; A first-stage mining area and a second-stage mining area are arranged between the first exploration line and the second exploration line. Both the first-stage mining area and the second-stage mining area are perpendicular to the first exploration line and the second exploration line. A shared ore extraction roadway for both the first-stage and second-stage mining areas is arranged at the intersection of the first-stage mining blast boundary and the second-stage mining blast boundary. The bottom of the mining area is layered, and in the first-level mining area, a first-level mining drilling roadway, a first-level mining cutting roadway, and a first-level mining oblique crossing roadway are arranged. Among them, the first-stage drilling tunnel is located on the side of the first-stage mining area away from the second-stage mining area, and the two ends of the first-stage drilling tunnel are connected to the first cross-vein tunnel and the second cross-vein tunnel, respectively. The one-step cutting roadway is located between the first and second cross-vein roadways and is parallel to both the first and second cross-vein roadways. There are two types of oblique cross-passages in one-step mining: the oblique cross-passage on the east side of one-step mining located between the cutting cross-passage and the first cross-vein cross-passage, and the oblique cross-passage on the west side of one-step mining located between the cutting cross-passage and the second cross-vein cross-passage. The two ends of the oblique cross-passages in one-step mining are connected to the drilling cross-passage and the shared ore extraction cross-passage, respectively. After the first-stage mining and backfilling are completed, second-stage mining drilling tunnels, second-stage mining cutting tunnels and second-stage mining oblique crossing tunnels will be arranged in the second-stage mining area. Among them, the second-step mining tunnel is located on the side of the second-step mining area away from the first-step mining area, and the two ends of the second-step mining tunnel are connected to the first through-vein tunnel and the second through-vein tunnel, respectively. The two-step cutting roadway is located between the first and second cross-vein roadways and is parallel to both the first and second cross-vein roadways. There are two types of oblique cross-passages in the two-step mining: the oblique cross-passage on the east side of the two-step mining, located between the cutting roadway and the first cross-vein roadway, and the oblique cross-passage on the west side of the two-step mining, located between the cutting roadway and the second cross-vein roadway. The two ends of the oblique cross-passages in the two-step mining are connected to the two-step mining drilling roadway and the shared ore extraction roadway, respectively. Peach-shaped pillars are positioned between the first-stage and second-stage mining areas to protect the shared ore extraction roadway.

2. The method for arranging the bottom structure of a multi-layered stope along the strike of the ore body according to claim 1, characterized in that, The distance between the first and second exploration lines is 100m.

3. The method for arranging the bottom structure of a multi-layered stope along the strike of the ore body according to claim 1, characterized in that, The dimensions of the first-stage rock drilling tunnel are 4*3.5m, with a 1 / 3 three-center arch; the dimensions of the second-stage rock drilling tunnel are 4*3.5m, with a 1 / 3 three-center arch.

4. The method for arranging the bottom structure of a multi-layered stope along the strike of the ore body according to claim 1, characterized in that, The dimensions of the first-stage mining cutting roadway are 4.8*4.2m, with a waist height of 4m and a circular arch; the dimensions of the second-stage mining cutting roadway are 4.8*4.2m, with a waist height of 4m and a circular arch.

5. The method for arranging the bottom structure of a multi-layered stope along the strike of the ore body according to claim 1, characterized in that, The dimensions of the first-stage mining inclined tunnel are 4*3.5m, with a 1 / 3 three-center arch; there are 2 inclined tunnels on the east side of the first-stage mining and 2 inclined tunnels on the west side of the first-stage mining. The dimensions of the second-stage mining inclined tunnel are 4*3.5m, with a 1 / 3 three-center arch; there are 1 or 2 inclined tunnels on the east side of the second-stage mining and 1 or 2 inclined tunnels on the west side of the second-stage mining.

6. A method for arranging the bottom structure of a multi-layered stope along the strike of the ore body according to claim 1 or 5, characterized in that, The distance between the east or west side oblique tunnel of the first-step mining section and the sidewall of the cutting tunnel of the first-step mining section is 6m. The included angle between the east or west side oblique tunnel of the first-step mining section and the drilling tunnel of the first-step mining section is 40°.

7. The method for arranging the bottom structure of a multi-layered stope along the strike of the ore body according to claim 5, characterized in that, The distance between the center lines of the two east-side oblique crossing roadways of the first-stage mining is 15m; the distance between the center lines of the two west-side oblique crossing roadways of the first-stage mining is 15m; the distance between the center lines of the two east-side oblique crossing roadways of the second-stage mining is 15m; and the distance between the center lines of the two west-side oblique crossing roadways of the second-stage mining is 15m.

8. The method for arranging the bottom structure of a multi-layered stope along the strike of the ore body according to claim 1, characterized in that, The distance between the right sidewall of the first-stage mining tunnel and the right boundary of the mining area is 1m, and the distance between the left sidewall and the right sidewall of the shared bottom structure is 8m; the distance between the right sidewall of the second-stage mining tunnel and the left sidewall of the shared bottom structure tunnel is 8m.

9. The method for arranging the bottom structure of a multi-layered stope along the strike of the ore body according to claim 1, characterized in that, The angle between the two hypotenuses of the peach-shaped pillar and the horizontal line is 50°.

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