Arrangement method of multi-layer stope bottom structure arranged along ore body trend

Abstract

The invention belongs to the field of underground mining, and relates to a method for arranging a bottom structure of a multi-layer stope arranged along the trend of an ore body, which comprises the following steps of: arranging a one-step mining rock drilling roadway, arranging a shared ore removal roadway, arranging a peach-shaped ore pillar, arranging a one-step mining cutting roadway, arranging a one-step mining inclined crossing roadway, arranging a two-step mining rock drilling roadway and arranging a two-step mining cutting roadway. According to the technical scheme, the problem that a bottom structure cannot be arranged in a two-step mining field is solved; a two-step mining field has a bottom structure, the ore removal efficiency is improved, the stoping period is shortened, ore removal is cleaner, ore loss is reduced, the opportunity of remote ore removal is reduced, and the risk that equipment is buried is reduced.

Description

Technical Field

[0001] The invention belongs to the field of underground mining and relates to a method for arranging a multi-layered stope bottom structure arranged along the direction of an ore body. Background Art

[0002] The mining of the stope is divided into one-step mining, two-step mining and three-step mining. After the first-step mining is completed, backfilling is carried out, and then the second-step mining is carried out. The layout of the stope is generally divided into vertical ore body strike layout or along the ore body strike layout. Among them, for the ore body with a gentle inclination and large horizontal thickness, the vein tunnel is generally arranged vertically to the ore body, and the plate area is arranged between the vein tunnels. The stopes are divided inside the plate area, and each stope is arranged along the ore body strike. Each stope is divided into multiple layers, and the multi-layered backfilling mining method is adopted. When the stope is backfilled, the bottom layer needs to be arranged with a bottom structure for ore removal.

[0003] For the mining sites arranged along the direction of the ore body, generally speaking, the first-step mining sites are arranged with the bottom structure, which includes the mining roadway and 4 oblique crossing roadways, while the second-step mining sites cannot be arranged with the bottom structure. The first-step mining mainly relies on the mining roadway and oblique crossing to mine. Since the second-step mining has no bottom structure, the mining is generally carried out at the entrance of each layered rock drilling roadway, and the mining is remotely controlled in the bottom rock drilling roadway by using a remote-controlled scraper. This has the following disadvantages:

[0004] 1) The mining efficiency is low and the mining cycle is long, which leads to long exposure of the empty areas in the mining area, which can easily lead to the collapse of the empty areas and the mixing of filling materials.

[0005] 2) The remote control mining distance is long, the visual effect is poor, the mining is difficult, and the mine may not be mined cleanly, resulting in mining volume loss.

[0006] 3) A large number of mines are removed from the mine by remote control, which carries a high risk. Once the empty area collapses, the shovel loader will be buried in the empty area and unable to get out. On the one hand, it causes equipment loss, and on the other hand, it makes it impossible to continue to mine, resulting in loss of ore volume. Summary of the invention

[0007] The present application provides a method for arranging the bottom structure of a multi-layered stope arranged along the direction of the ore body, which solves the problem that the bottom structure cannot be arranged in the two-step stope. The two-step stope has a bottom structure, which improves the mining efficiency, shortens the mining cycle, makes the mining cleaner, reduces the loss of ore volume, reduces the chance of remote control mining, and reduces the risk of equipment being buried.

[0008] In order to achieve the above technical objectives, the technical solution adopted by the present application is: a method for arranging the bottom structure of a multi-layered stope arranged along the direction of the ore body, comprising:

[0009] acquiring a first exploration line and a second exploration line;

[0010] Between the first exploration line and the second exploration line, a first vein-penetrating tunnel is arranged on a side close to the first exploration line; and a second vein-penetrating tunnel is arranged on a side close to the second exploration line;

[0011] Arranging a first-step mining field and a second-step mining field between the first exploration line and the second exploration line, wherein the first-step mining field and the second-step mining field are both perpendicular to the first exploration line and the second exploration line;

[0012] A common mine exit tunnel for use by the first-step mining site and the second-step mining site is arranged at the intersection of the first-step mining blasting boundary and the second-step mining blasting boundary;

[0013] Layer the bottom of the stope, and arrange the first-step rock drilling tunnel, the first-step cutting tunnel, and the first-step oblique crossing tunnel in the first-step stope;

[0014] The first-step rock drilling tunnel is located at the side of the first-step mining site away from the second-step mining site, and the two ends of the first-step rock drilling tunnel are respectively connected to the first vein-penetrating tunnel and the second vein-penetrating tunnel;

[0015] The one-step mining and cutting lane is located between the first and second vein-penetrating lanes and is parallel to the first and second vein-penetrating lanes;

[0016] There are two types of one-step mining oblique crossing tunnels, namely, the one-step mining east oblique crossing tunnel between the one-step mining cutting tunnel and the first vein crossing tunnel, and the one-step mining west oblique crossing tunnel between the one-step mining cutting tunnel and the second vein crossing tunnel; the two ends of the one-step mining oblique crossing tunnel are respectively connected to the one-step mining rock drilling tunnel and the shared mine exit tunnel;

[0017] After the first-step mining and backfilling are completed, the second-step mining rock drilling tunnel, the second-step mining cutting tunnel and the second-step mining oblique crossing tunnel are arranged in the second-step mining site;

[0018] The second-step rock drilling tunnel is located at the side of the second-step mining site away from the first-step mining site, and the two ends of the second-step rock drilling tunnel are respectively connected to the first vein tunnel and the second vein tunnel;

[0019] The second-step mining and cutting tunnel is located between the first and second vein tunnels and is parallel to the first and second vein tunnels;

[0020] There are two types of two-step mining oblique crossing tunnels, namely the two-step mining east side oblique crossing tunnel between the two-step mining cutting tunnel and the first vein tunnel, and the two-step mining west side oblique crossing tunnel between the two-step mining cutting tunnel and the second vein tunnel; the two ends of the two-step mining oblique crossing tunnel are connected to the two-step mining rock drilling tunnel and the shared mining tunnel respectively;

[0021] Peach-shaped pillars are arranged between the first-step mining area and the second-step mining area to protect the shared mining tunnel.

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

[0023] As an improved technical solution of the present application, the size specification of the one-step rock drilling tunnel is 4*3.5m, 1 / 3 three-center arch; the size specification of the two-step rock drilling tunnel is 4*3.5m, 1 / 3 three-center arch.

[0024] As an improved technical solution of this application, the size specification of the one-step mining and cutting tunnel is 4.8*4.2m, the waist height is 4m, and the arc arch; the size specification of the two-step mining and cutting tunnel is 4.8*4.2m, the waist height is 4m, and the arc arch.

[0025] As an improved technical solution of the present application, the size specification of the one-step diagonal tunnel is 4*3.5m, 1 / 3 three-center arch; among them, there are 2 diagonal tunnels on the east side of the one-step mining, and 2 diagonal tunnels on the west side of the one-step mining; the size specification of the two-step diagonal tunnel is 4*3.5m, 1 / 3 three-center arch, among which there are 1 or 2 diagonal tunnels on the east side of the two-step mining, and 1 or 2 diagonal tunnels on the west side of the two-step mining.

[0026] As an improved technical solution of the present application, the one-step mining east side oblique tunnel or the one-step mining west side oblique tunnel is 6m away from the side of the one-step mining cutting tunnel, and the angle between the one-step mining east side oblique tunnel or the one-step mining west side oblique tunnel and the one-step mining rock drilling tunnel is 40°.

[0027] As an improved technical solution of the present application, the spacing between the oblique center lines of the two one-step east side oblique tunnels is 15m; the spacing between the oblique center lines of the two one-step west side oblique tunnels is 15m; the spacing between the oblique center lines of the two two-step east side oblique tunnels is 15m; the spacing between the oblique center lines of the two two-step west side oblique tunnels is 15m.

[0028] As an improved technical solution of this application, the right side wall of the one-step rock drilling tunnel is 1m away from the right boundary of the mining area, and the left side wall is 8m away from the right side wall of the shared bottom structure; the right side wall of the two-step rock drilling tunnel is 8m away from the left side wall of the shared bottom structure tunnel.

[0029] As an improved technical solution of the present application, the angle between the hypotenuse on both sides of the peach-shaped pillar and the horizontal line is 50°.

[0030] Beneficial Effects

[0031] (1) The second-step mining site has a bottom structure, which improves the mining efficiency, shortens the mining cycle of the second-step mining, and reduces the risk of collapse of the second-step goaf;

[0032] (2) Make the second-step mining site more convenient and cleaner to mine, thus avoiding the loss of ore volume;

[0033] (3) It reduces the need for remote control mining in the second-step mining site, reduces the risk of equipment being buried, and reduces the impact of buried equipment on mining, thereby reducing economic losses. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0035] Figure 2 Sectional view of bottom structure layout;

[0036] In the figure, 1. One-step mining diagonally crosses the tunnel on the west side; 2. One-step mining blasting boundary; 3. One-step mining cutting tunnel; 4. One-step mining diagonally crosses the tunnel on the east side; 5. One-step mining site name; 6. One-step mining rock drilling tunnel; 7. Shared mine exit tunnel name; 8. Shared mine exit tunnel; 9. Two-step mining rock drilling tunnel; 10. Two-step mining site name; 11. Two-step mining diagonally crosses the tunnel on the east side; 12. Two-step mining cutting tunnel; 13. Two-step mining blasting boundary; 14. Two-step mining diagonally crosses the tunnel on the west side; 15. The first exploration line; 16. The name of the first exploration line; 17. The first vein tunnel; 18. Peach-shaped ore pillar; 19. The second exploration line; 20. The name of the second exploration line; 21. The second vein tunnel. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1-2 The technical solution of the present application is clearly and completely described. In the figure: In the figure, the first-step mining west side oblique crossing tunnel 1, the first-step mining blasting boundary 2, the first-step mining cutting tunnel 3, the first-step mining east side oblique crossing tunnel 4, the first-step mining site name 5, the first-step mining rock drilling tunnel 6, the shared mining tunnel name 7, the shared mining tunnel 8, the second-step mining rock drilling tunnel 9, the second-step mining site name 10, the second-step mining east side oblique crossing tunnel 11, the second-step mining cutting tunnel 12, the second-step mining blasting boundary 13, the second-step mining west side oblique crossing tunnel 14, the first exploration line 15, the first exploration line name 16, the first vein tunnel 17, the peach-shaped ore pillar 18, the second exploration line 19, the second exploration line name 20, the second vein tunnel 21.

[0038] The layout of each tunnel in this technical solution is located at the bottom layer of the stope, including the layout of the one-step rock drilling tunnel 6, the layout of the common mining tunnel 8, the layout of the peach-shaped ore pillar 18, the layout of the one-step mining cutting tunnel 3, the layout of the one-step mining oblique tunnel, the layout of the two-step rock drilling tunnel 9, the layout of the two-step mining cutting tunnel 12, and the layout of the two-step mining oblique tunnel, as follows:

[0039] like Figure 1-2 As shown, a method for arranging a multi-layer stope bottom structure arranged along the ore body direction includes:

[0040] Acquire a first exploration line 15 and a second exploration line 19;

[0041] Between the first exploration line 15 and the second exploration line 19, a first vein tunnel 17 is arranged on a side close to the first exploration line 15, and a second vein tunnel 21 is arranged on a side close to the second exploration line 19;

[0042] A first-step mining field and a second-step mining field are arranged between the first exploration line 15 and the second exploration line 19, and the first-step mining field and the second-step mining field are both perpendicular to the first exploration line 15 and the second exploration line 19;

[0043] A common mine exit tunnel 8 for use by the first-step mining field and the second-step mining field is arranged at the intersection of the first-step mining blasting boundary 2 and the second-step mining blasting boundary 13;

[0044] Layering is performed at the bottom of the stope, and a first-stage rock drilling tunnel 6, a first-stage cutting tunnel 3, and a first-stage oblique crossing tunnel are arranged in the first-stage stope;

[0045] The first-step rock drilling tunnel 6 is located at the side of the first-step mining field away from the second-step mining field, and the two ends of the first-step rock drilling tunnel 6 are respectively connected to the first vein tunnel 17 and the second vein tunnel 21;

[0046] The one-step mining and cutting lane 3 is located between the first vein-penetrating lane 17 and the second vein-penetrating lane 21 and is parallel to the first vein-penetrating lane 17 and the second vein-penetrating lane 21;

[0047] There are two types of one-step mining oblique crossing tunnels, namely, one-step mining east oblique crossing tunnel 4 located between one-step mining cutting tunnel 3 and first vein crossing tunnel 17, and one-step mining west oblique crossing tunnel 1 between one-step mining cutting tunnel 3 and second vein crossing tunnel 21; both ends of one-step mining oblique crossing tunnels are connected to one-step mining rock drilling tunnel 6 and common mine exit tunnel 8 respectively;

[0048] After the first-step mining and backfilling are completed, the second-step mining rock drilling tunnel 9, the second-step mining cutting tunnel 12 and the second-step mining oblique crossing tunnel are arranged in the second-step mining site;

[0049] The second-step rock drilling tunnel 9 is located at the side of the second-step mining field away from the first-step mining field, and the two ends of the second-step rock drilling tunnel 9 are respectively connected to the first vein tunnel 17 and the second vein tunnel 21;

[0050] The second-step mining and cutting lane 12 is located between the first vein-penetrating lane 17 and the second vein-penetrating lane 21 and is parallel to the first vein-penetrating lane 17 and the second vein-penetrating lane 21;

[0051] There are two types of two-step mining oblique crossing tunnels, namely, the two-step mining east side oblique crossing tunnel 11 located between the two-step mining cutting tunnel 12 and the first vein tunnel 17, and the two-step mining west side oblique crossing tunnel 14 between the two-step mining cutting tunnel 12 and the second vein tunnel 21; the two ends of the two-step mining oblique crossing tunnel are respectively connected to the two-step mining rock drilling tunnel 9 and the shared mining tunnel 8;

[0052] The peach-shaped ore pillar 18 is arranged between the first-step mining area and the second-step mining area to protect the common mining tunnel 8.

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

[0054] About Yibucai:

[0055] In some embodiments, the size of the one-step mining tunnel 6 is 4*3.5m, 1 / 3 three-center arch. Among them, the right side of the one-step mining tunnel 6 is 1m away from the right boundary of the one-step mining field, and the left side is 8m away from the right side of the shared bottom structure. The reason is that it is necessary to arrange a shared mining tunnel at the intersection of the one-step mining and two-step mining blasting boundaries, and arrange peach-shaped ore pillars 18 to protect the shared mining tunnel 8 and prevent it from being damaged.

[0056] The size of the one-step mining and cutting tunnel 3 is 4.8*4.2m, with a waist height of 4m and a circular arch, in order to adapt to the construction of the cutting well trolley.

[0057] The one-step mining and cutting tunnel 3 is located between the first through-vein tunnel 17 and the second through-vein tunnel 21, and is parallel to the first through-vein tunnel 17 and the second through-vein tunnel 21. The reason is that it is convenient for subsequent blasting and mining at both ends, and the mining efficiency is high.

[0058] In some embodiments, the size specification of the one-step mining oblique tunnel is 4*3.5m, 1 / 3 three-center arch; there are 2 one-step mining east side oblique tunnels 4 and 2 one-step mining west side oblique tunnels 1.

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

[0060] In some embodiments, the angle between the one-step mining east side oblique crossing tunnel 4 or the one-step mining west side oblique crossing tunnel 1 and the one-step mining rock drilling tunnel 6 is 40°. The reason is to increase the length of the oblique crossing so that there is enough space for the closed wall after the subsequent mining of the stope is completed.

[0061] In some embodiments, the distance between the oblique center lines of the two one-step mining east oblique tunnels 4 is 15m; the distance between the oblique center lines of the two one-step mining west oblique tunnels 1 is 15m. The reason is that, on the one hand, the oblique tunnels are evenly distributed, which is conducive to cleaner ore discharge, and on the other hand, the distance between the one-step mining east oblique tunnels 4 should be more than 5.5m, which is safer.

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

[0063] About the second step:

[0064] In some embodiments, the size of the two-step mining tunnel 9 is 4*3.5m, 1 / 3 three-center arch; the two ends of the two-step mining tunnel 9 are respectively connected to the first through-vein tunnel 17 and the second through-vein tunnel 21. 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 site) is 8m away from the left side of the shared bottom structure tunnel. The reason is that it is necessary to arrange a shared mining tunnel 8 at the intersection of the first-step mining blasting boundary 2 and the second-step mining blasting boundary 13, and arrange peach-shaped ore pillars 18 to protect the shared mining tunnel 8 and prevent it from being damaged.

[0065] In some embodiments, the size of the two-step mining cutting tunnel 12 is 4.8*4.2m, the waist height is 4m, and the arc arch is used to adapt to the construction of the cutting well trolley. The two-step mining cutting tunnel 12 is located in the middle between the first through-vein tunnel 17 and the second through-vein tunnel 21, mainly to facilitate the subsequent blasting of the two ends, and the mining efficiency is high. The right side of the two-step mining cutting tunnel 12 is 2m away from the boundary of the two-step mining site. The reason is that this 2m range is located in the shared mining tunnel 8 area. When the first step of mining is recovered, this area is easy to collapse. The top of the shared mining tunnel 8 is easy to collapse relatively high. After filling, the area is full of filling body, and it is not safe enough when digging the filling body. Therefore, for safety reasons, it is chosen not to dig.

[0066] In some embodiments, the size specification of the second-step mining oblique tunnel is 4*3.5m, 1 / 3 three-center arch, and the second-step mining east side oblique tunnel 11 can select 1 or 2 according to the site conditions, and the second-step mining west side oblique tunnel 14 can select 1 or 2 according to the site conditions.

[0067] In some embodiments, the distance between the oblique center lines of the two second-step mining east oblique tunnels 11 is 15m; the distance between the oblique center lines of the two second-step mining west oblique tunnels 14 is 15m. The reason is that, on the one hand, the oblique tunnels are evenly distributed, which is conducive to cleaner ore discharge, and on the other hand, the distance between the oblique tunnels should be more than 5.5m, which is safer.

[0068] In some embodiments, the second-step mining west side oblique tunnel 14 is 6m or more than 6m close to the side of the second-step mining cutting tunnel 12. It can be staggered with the first-step mining oblique position according to the on-site lithological conditions. The reason is that the first-step mining is backfilled after the end of the backfilling, and this cycle is relatively long. The shared mining tunnel 8 is located in the ore pillar between the first-step mining site and the second-step mining site, which is easily damaged. For safety reasons, it is necessary to adjust the position of the second-step mining west side oblique tunnel 14 according to the on-site conditions.

[0069] About the shared mine tunnel:

[0070] In some embodiments, the size of the shared mining tunnel 8 is 4*3.5m, 1 / 3 three-center arch. The two ends are connected to the first through-vein tunnel 17 and the second through-vein tunnel 21 respectively. The shared mining tunnel 8 is located at the intersection of the first-step mining blasting boundary 2 and the second-step mining blasting boundary 13. The shared mining tunnel 8 is both the mining tunnel of the first-step mining and the mining tunnel of the second-step mining. Whether it is the first-step mining field or the second-step mining field, the ore is mined through the shared mining tunnel 8, so it should be arranged at the intersection of the blasting boundaries of the two mining fields.

[0071] As an improved technical solution of the present application, the angle between the oblique sides of the peach-shaped pillar 18 and the horizontal line is 50°. The function of the peach-shaped pillar 18 is to protect the shared mining tunnel 8. The angle between the oblique sides of the peach-shaped pillar 18 and the horizontal line is 50°. A shared mining tunnel 8 is arranged inside the peach-shaped pillar 18, and the shared mining tunnel 8 is located in the middle of the bottom of the peach-shaped pillar 18. The shared mining tunnel is located in the middle of the peach-shaped pillar in the horizontal direction; in the vertical direction, it is located at the bottom of the peach-shaped pillar.

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

[0073] Example 1

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

[0075] The width of the 18221 stope (one-step stope) is 15m, and the width of the 18212 stope (two-step stope) is 18m. The stopes are located between the first exploration line 15 and the second exploration line 19, and are arranged perpendicular to the directions of the first exploration line 15 and the second exploration line 19. The spacing between the first exploration line 15 and the second exploration line 19 is 100m. In the bottom layer -455m layer, the one-step drilling tunnel 6 and the one-step cutting tunnel 3 are arranged in the 18221 stope. The mine exit tunnel 8 is shared at the boundary between the 18221 stope and the 18212 stope. The one-step mining oblique tunnel is arranged in the 18221 stope for ore exit.

[0076] After the backfilling of the 18221 mining area is completed, a two-step rock drilling tunnel 9 and a two-step mining cutting tunnel 12 are arranged in the 18212 mining area, and a two-step mining oblique tunnel is arranged at the position of the shared mining tunnel 8 for mining in the 18212 mining area.

[0077] Through the shared bottom structure arrangement, the mining efficiency of the 18212 mine can be greatly improved, reducing the risk of empty area collapse; the 18212 mine can be more convenient and cleaner to mine, thus avoiding the loss of ore volume; the 18212 mine can reduce remote control mining, reduce the risk of equipment being buried, and reduce the impact of buried equipment on mining, thereby reducing economic losses.

Claims

1. A method for arranging a multi-layer stope bottom structure along the ore body, characterized in that: include acquiring a first exploration line and a second exploration line; A first vein-penetrating tunnel is arranged between the first exploration line and the second exploration line, on a side close to the first exploration line; A second vein-penetrating tunnel is set on one side adjacent to the second exploration line; Arranging a first-step mining field and a second-step mining field between the first exploration line and the second exploration line, wherein the first-step mining field and the second-step mining field are both perpendicular to the first exploration line and the second exploration line; A common mine exit tunnel for use by the first-step mining site and the second-step mining site is arranged at the intersection of the first-step mining blasting boundary and the second-step mining blasting boundary; Layer the bottom of the stope, and arrange the first-step rock drilling tunnel, the first-step cutting tunnel, and the first-step oblique crossing tunnel in the first-step stope; The first-step rock drilling tunnel is located at the side of the first-step mining site away from the second-step mining site, and the two ends of the first-step rock drilling tunnel are respectively connected to the first vein-penetrating tunnel and the second vein-penetrating tunnel; The one-step mining and cutting lane is located between the first and second vein-penetrating lanes and is parallel to the first and second vein-penetrating lanes; There are two types of one-step mining oblique crossing tunnels, namely, the one-step mining east oblique crossing tunnel between the one-step mining cutting tunnel and the first vein crossing tunnel, and the one-step mining west oblique crossing tunnel between the one-step mining cutting tunnel and the second vein crossing tunnel; the two ends of the one-step mining oblique crossing tunnel are respectively connected to the one-step mining rock drilling tunnel and the shared mine exit tunnel; After the first-step mining and backfilling are completed, the second-step mining rock drilling tunnel, the second-step mining cutting tunnel and the second-step mining oblique crossing tunnel are arranged in the second-step mining site; The second-step rock drilling tunnel is located at the side of the second-step mining site away from the first-step mining site, and the two ends of the second-step rock drilling tunnel are respectively connected to the first vein tunnel and the second vein tunnel; The second-step mining and cutting tunnel is located between the first and second vein tunnels and is parallel to the first and second vein tunnels; There are two types of two-step mining oblique crossing tunnels, namely the two-step mining east side oblique crossing tunnel between the two-step mining cutting tunnel and the first vein tunnel, and the two-step mining west side oblique crossing tunnel between the two-step mining cutting tunnel and the second vein tunnel; the two ends of the two-step mining oblique crossing tunnel are connected to the two-step mining rock drilling tunnel and the shared mining tunnel respectively; Peach-shaped pillars are arranged between the first-step mining area and the second-step mining area to protect the shared mining tunnel.

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

3. The method for arranging a multi-layer stope bottom structure along the ore body direction according to claim 1, characterized in that: The size specification of the first-step rock drilling tunnel is 4*3.5m, 1 / 3 three-center arch; the size specification of the second-step rock drilling tunnel is 4*3.5m, 1 / 3 three-center arch.

4. The method for arranging the bottom structure of a multi-layered stope arranged along the direction of the ore body according to claim 1, characterized in that: The size specification of the first-step mining and cutting tunnel is 4.8*4.2m, the waist height is 4m, and the arc arch; the size specification of the second-step mining and cutting tunnel is 4.8*4.2m, the waist height is 4m, and the arc arch.

5. The method for arranging the bottom structure of a multi-layered stope arranged along the direction of the ore body according to claim 1, characterized in that: The size specification of the first-step mining oblique tunnel is 4*3.5m, 1 / 3 three-center arch; there are 2 oblique tunnels on the east side of the first-step mining, and 2 oblique tunnels on the west side of the first-step mining; the size specification of the second-step mining oblique tunnel is 4*3.5m, 1 / 3 three-center arch, among which there are 1 or 2 oblique tunnels on the east side of the second-step mining, and 1 or 2 oblique tunnels on the west side of the second-step mining.

6. A method for arranging a multi-layer stope bottom structure along the ore body direction according to claim 1 or 5, characterized in that: The distance between the east side oblique tunnel of one-step mining or the west side oblique tunnel of one-step mining and the side wall of the one-step mining cutting tunnel is 6m, and the angle between the east side oblique tunnel of one-step mining or the west side oblique tunnel of one-step mining and the one-step mining rock drilling tunnel is 40°.

7. The method for arranging the bottom structure of a multi-layered stope arranged along the direction of the ore body according to claim 5, characterized in that: The spacing between the oblique center lines of the two one-step mining east side oblique tunnels is 15m; the spacing between the oblique center lines of the two one-step mining west side oblique tunnels is 15m; the spacing between the oblique center lines of the two two-step mining east side oblique tunnels is 15m; the spacing between the oblique center lines of the two two-step mining west side oblique tunnels is 15m.

8. The method for arranging the bottom structure of a multi-layered stope arranged along the direction of the ore body according to claim 1, characterized in that: The right side of the first-step mining tunnel is 1m away from the right boundary of the mining area, and the left side is 8m away from the right side of the shared bottom structure; the right side of the second-step mining tunnel is 8m away from the left side of the shared bottom structure tunnel.

9. The method for arranging the bottom structure of a multi-layered stope arranged along the direction of the ore body according to claim 1, characterized in that: The included angle between the hypotenuse on both sides of the peach-shaped pillar and the horizontal line is 50°.

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