A mining method for a gently inclined medium-thick ore body with both the surrounding rock and the ore body being broken

Abstract

The present invention belongs to the field of mining technology, and specifically relates to a method for mining a gently inclined medium-thick ore body in which both the upper plate surrounding rock and the ore body are broken, and the steps are: stope layout, mining, cutting and recovery. The present invention continuously mines along the strike direction of the ore body, induces the upper plate surrounding rock to fall to manage ground pressure; and sets up a one-step stope and a two-step stope in sections to ensure the fall of the surrounding rock to the maximum extent; makes full use of the crushing characteristics of the ore body and the surrounding rock, no longer digs cutting tunnels and skylights, uses the rock drilling tunnel as a free space, and drills opposite inclined blastholes to form cutting grooves to reduce the amount of cutting engineering; the rock drilling tunnel is arranged in the lower plate surrounding rock with good stability to ensure the safety of the mining, cutting and recovery process; the main transportation tunnel, auxiliary transportation tunnel and vein tunnel are set in the lower plate to form a lower plate circular transportation system, and a large trackless shovel equipment is used to mine, while ensuring safety, the production capacity of the stope of the gently inclined medium-thick ore body is maximized.

Description

Technical Field

[0001] The invention relates to the technical field of mining, and in particular to a method for mining a gently inclined medium-thick ore body in which both the upper wall surrounding rock and the ore body are broken. Background Art

[0002] With the rapid development of social economy, the intensity of mineral resource development continues to increase. Some easy-to-mine ore bodies with good grade, high value, stable surrounding rock and good occurrence conditions have been mined out, and the proportion of ore deposits with relatively poor mining conditions is gradually increasing. For example, for some medium-thick ore bodies with gentle inclination and below, the traditional mining method for such ore bodies is the room-pillar method, but due to the conditions of broken ore bodies and upper wall surrounding rock, the traditional mining method of using the stability of ore pillars and surrounding rock to manage ground pressure is no longer applicable. Downward stratified approach mining can technically meet the mining requirements, but if such ore bodies are of low grade and low value, then the disadvantages of the downward stratified mining method, such as large amount of lower wall mining and heavy work of laying false bottom, are more prominent, and cannot meet the mining requirements economically.

[0003] Chinese patent CN 109083644 A discloses a safe and efficient mining method for a gently inclined medium-thick ore body, in which both the upper and lower plates of the ore body are equipped with mining and cutting works, which is labor-intensive and costly. Chinese patent CN 108612530 A discloses a mining method for an inclined medium-thick ore body with broken upper plate surrounding rock, which is low in cost, but for an ore body with broken upper plate surrounding rock, it adopts a method of pre-reserving upper plate ore pillars and anchor support without damaging the upper plate surrounding rock, which is labor-intensive and cannot ensure that the safety problems caused by the broken upper plate surrounding rock and ore body are solved.

[0004] Therefore, it is necessary to develop new mining methods that can take into account both the safety issues caused by the crushing of the upper surrounding rock and ore body and the mining efficiency, so as to meet the economic feasibility of mining such deposits. Summary of the invention

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a mining method for gently inclined medium-thick ore bodies in which both the upper surrounding rock and the ore body are broken, which solves the technical problems of the difficulty in balancing the mining safety and economy and the high mining cost of traditional mining methods for such ore bodies.

[0006] In order to achieve the above object, the present invention proposes a method for mining a gently inclined medium-thick ore body in which both the hanging wall surrounding rock and the ore body are broken, the steps are as follows:

[0007] S1. Stope layout: along the inclination direction of the ore body, the stage is divided into multiple sections, and multiple stopes are set up in each section along the strike direction of the ore body. Barrier pillars are left in the stopes between the sections; the stopes include the first-step stope and the second-step stope. In the same stope of the same section, the first-step stope and the second-step stope are set up continuously in the vertical direction of the ore body, and a triangular pillar is left between the first-step stope and the second-step stope in the same section; in the vertical direction of the ore body in a stage, the first-step stope and the second-step stope are arranged at intervals;

[0008] S2, Mining: Open the stage main transport lane in the direction of the ore body at the stage level, excavate the vein-crossing lane in the stage main transport lane in the direction of the ore body to the stage auxiliary transport lane, the stage main transport lane and the stage auxiliary transport lane are set horizontally, and the stage main transport lane, the stage auxiliary transport lane and the vein-crossing lane form an outer vein ring transport system at the stage level;

[0009] In the stage, the auxiliary transport roadway is along the vein roadway, and in each segment and second-step stope, the ramp connecting roadway is horizontally excavated toward the ore body to the horizontal transport roadway; each ramp connecting roadway is connected by the excavated ramp;

[0010] The horizontal transport tunnels are used to excavate multiple mine-exit tunnels in the direction of the ore body. The ends of the mine-exit tunnels are excavated into rock drilling tunnels along the direction of the ore body. A chute is arranged on the side of the horizontal transport tunnels of each section away from the rock drilling tunnel. The chute connects the ramp connecting tunnel of this section located in the second-step stope to the tunnel at the bottom of this stage.

[0011] S3, cutting: drilling multiple rows of inclined cutting blastholes towards the ore body in the rock drilling tunnel; the rock drilling tunnel is used as a free space, and the cutting blastholes are drilled to form cutting grooves;

[0012] S4. Mining: The mining areas within a stage are mined in sections from top to bottom. In the same section, the first-step mining area is mined first, and then the second-step mining area. In the rock drilling tunnel, mining holes are drilled in the center of the double rock drilling, and the cutting groove is used as the blasting free surface for blasting. At the same time, the falling of the upper surrounding rock is monitored from the mining tunnel at the corresponding position, and the ore is shoveled from the rock drilling tunnel and the mining tunnel, and poured into the nearest chute for mining. The mixing of waste rock from the upper wall with the ore will cause the ore grade to decrease. When the ore grade is reduced to the cut-off grade, the mining is stopped.

[0013] Furthermore, in step S1, the cross-sections of the barrier pillars and the triangular pillars are both triangular, with a larger area on the side facing the lower wall of the ore body and a gradually decreasing area on the side facing the upper wall of the ore body.

[0014] Furthermore, in step S1, the stage height is 30-40 m, one stage is divided into 3 or 4 sections, the span of the exposed upper wall of the first-step stope is 25-30 m, and the span of the exposed upper wall of the second-step stope is 10-15 m.

[0015] Furthermore, in step S2, the length of the mining tunnel is 10 to 12 m, and the distance between adjacent mining tunnels is 8 to 10 m.

[0016] Furthermore, in step S2, the distance between adjacent chutes in the direction of the ore body is 150 to 200 m.

[0017] Furthermore, in step S3, the cutting blastholes are inclined blastholes arranged opposite to each other, and the inclination angles of the cutting blastholes gradually increase from the inside to the outside.

[0018] Furthermore, in step S3, the cutting blastholes are composed of three parallel blastholes, the spacing between the blastholes is 1.2 to 1.5 m, and the distance between the blastholes and the boundary of the rock drilling tunnel is 0.5 to 0.8 m.

[0019] Furthermore, in step S3, the cutting groove is formed by two blastings, and the ore is loosened and taken out from the rock drilling tunnel after the first blasting, and then the second blasting is performed to loosen and take out the ore again, ensuring that 50% of the ore volume remains in the cutting groove.

[0020] Furthermore, in step S4, the center distance between the double rock drilling centers is 1.5 m, and the hole bottom distance of the fan-shaped blasthole is controlled at 2.6-3 m.

[0021] Beneficial effects:

[0022] The present invention proposes a mining method for a gently inclined medium-thick ore body in which both the upper wall surrounding rock and the ore body are broken. The cross-sectional shape of the stope is approximately rhombus-shaped, and continuous mining is carried out along the strike direction of the ore body. The method of pre-reserving upper wall ore pillars, anchor support and the like are no longer used to avoid damaging the upper wall surrounding rock. Instead, the broken characteristics of the upper wall surrounding rock and the ore body are utilized to induce the broken upper wall surrounding rock to fall, so as to manage ground pressure. A one-step stope and a two-step stope are set up in sections, and the one-step stope is first mined, and then the two-step stope is mined. The two-step stope can block the mixing of the upper falling loose bodies, and further increase the falling area of ​​the upper wall surrounding rock when no falling occurs after mining in the first stope, so as to ensure the falling of the surrounding rock to the maximum extent. The broken characteristics of the ore body and the upper wall surrounding rock are fully utilized, and cutting tunnels and skylights are no longer excavated, and the rock drilling tunnel is used as a free space. Drilling inclined (with gradually increasing angles) blastholes facing each other forms cutting grooves to increase cutting efficiency and reduce cutting workload; drilling tunnels are arranged in the lower wall surrounding rock with better stability, and no tunnels are arranged in the ore body and upper wall surrounding rock to ensure the safety of mining, cutting and recovery processes; barrier pillars or triangular pillars are set between the stopes between sections and between the two stopes within a section to avoid the flow of falling ore into the mine outlet as much as possible and control the depletion during the mine outlet process; main transport tunnels, auxiliary transport tunnels and vein-penetrating tunnels are set up in the lower wall to form a lower wall circular transport system. Compared with the vein-side transport system commonly used in this type of ore body, the transport capacity is greatly improved, and large-scale trackless shovel equipment is used to mine. While ensuring safety, the production capacity of the stopes of gently inclined medium and thick ore bodies is maximized.

[0023] In summary, the present invention makes full use of the characteristics of both the upper surrounding rock and the ore body being broken. Under the premise of ensuring the safety of mining operations, it reduces the workload of mining and approval, improves the transportation capacity, and reduces the cost. It can take into account the safety issues and mining efficiency caused by the crushing of the upper surrounding rock and ore body, meet the mining economy of this type of ore deposit, and is suitable for promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the working principle of the present invention;

[0025] Figure 2 for Figure 1 Middle Ⅰ-Ⅰ section view;

[0026] Figure 3 for Figure 1 Middle II-II cross-sectional view;

[0027] Figure 4 for Figure 1 Middle III-III sectional view;

[0028] Figure 5 for Figure 4 Middle VV section view;

[0029] Figure 6for Figure 4 Middle IV-IV cross-sectional view;

[0030] Description of reference numerals:

[0031] 1-stage main transport tunnel; 2-stage auxiliary transport tunnel; 3-vein tunnel; 4-horizontal transport tunnel; 5-rock drilling tunnel; 6-mine exit tunnel; 7-inclined tunnel; 8-inclined tunnel connecting tunnel; 9-chute; 10-first-step stope; 11-second-step stope; 12-ore body; 13-falling waste rock; 14-blocking pillar; 15-triangular pillar; 16-cutting blasthole; 17-recovery blasthole;

[0032] a represents the strike direction of the ore body, b represents the dip direction of the ore body, c represents the vertical direction of the ore body, d represents the upper wall direction of the ore body, and e represents the lower wall direction of the ore body. DETAILED DESCRIPTION

[0033] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0034] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0035] like Figures 1 to 6 As shown, the present invention relates to a method for mining a gently inclined medium-thick ore body in which both the upper wall surrounding rock and the ore body are broken, comprising:

[0036] S1. Stope layout:

[0037] like Figure 1 As shown, along the ore body dip direction b, several sections are divided in the stage, and multiple stopes are set along the ore body strike direction a in each section. The stope length refers to the length along the ore body strike direction a, the width is the length along the ore body dip direction b, and the height is the length in the ore body vertical direction c. The stope includes a first-step stope 10 and a second-step stope 11. In the same stope of the same section, the first-step stope 10 and the second-step stope 11 are continuously set in the ore body vertical direction c. In a stage, the first-step stope 10 and the second-step stope 11 are arranged at intervals in the ore body vertical direction c.

[0038] The cross-sections of the first-step stope 10 and the second-step stope 11 are both approximately rhombus-shaped, with segmented barrier pillars 14 set in the stopes between the segments, and triangular pillars 15 set between the first-step stope 10 and the second-step stope 11 in the same segment. The cross-sections of the barrier pillars 14 and the triangular pillars 15 are both triangular, with a larger area on the side facing the lower wall of the ore body in the direction e, and a smaller area on the side facing the upper wall of the ore body in the direction d, so as to provide stable support for the gently inclined medium-thick ore body with broken upper wall surrounding rock and ore body, avoid the flow of falling ore into the mine outlet as much as possible, control the depletion during the mining process, and ensure the safety of the operation. Under this structural condition, pillars do not need to be set along the strike direction a of the ore body, thereby reducing costs. The stope is continuously mined, and the stope within the stage is from bottom to top (such as Figure 1 The method of the present invention saves time, effort and cost, and does not involve the mixing of the upper surrounding rock that has fallen from the upper stope where mining has been completed, thereby avoiding the depletion of the ore; further, in the case where the upper rock has not fallen, the exposed area of ​​the upper surrounding rock is further increased by adding the second-step stope 11, and the disturbance during the collapse mining process is used to promote the falling of the upper surrounding rock and fill the stope; compared with the existing ground pressure management method that uses reserved upper wall pillars, anchor support and the like that does not damage the upper wall surrounding rock (the upper wall surrounding rock of the ore body has been broken), the method of the present invention saves time, effort and cost, and does not have the potential safety hazard caused by the ineffective support of the broken upper wall surrounding rock.

[0039] The stages described in the present invention are: in the vertical direction, at certain intervals, one or several main transport tunnels are excavated in the same direction a as the ore body, and the ore body 12 is divided into blocks in the vertical direction c of the ore body. This block is the stage. The main transport tunnel is the stage main transport tunnel 1. The vertical distance between the bottom plates of the upper and lower adjacent stage main transport tunnels 1 is the stage height, and the stage height is 30 to 40 meters. The segment height is preferably 10 meters. If the stage height is 30 meters, three segments are set in one stage. The first-step stope 10 exposes the upper wall span (such as Figure 6 Middle B) is controlled at 25-30m, and the span of the upper wall exposed in the second-step stope 11 (such as Figure 6 Middle C) is controlled at 10-15m. Since the upper surrounding rock and the ore body of the gently inclined medium-thick ore body targeted by the present invention are both broken, in order to ensure the safety of mining operations, the second-step stope 11 plays a role in blocking the mixing of the surrounding rock loose bodies that fall from the upper part. At the same time, after the first-step stope 10 is mined, the upper surrounding rock does not fall, and the second-step stope 11 can further increase the exposure area, maximize the surrounding rock fall, induce the upper surrounding rock fall, and manage ground pressure.

[0040] S2. Approval:

[0041] The main transport tunnel 1 is opened in the stage level toward the ore body 12, and the through-vein tunnel 3 is excavated from the predetermined position of the main transport tunnel 1 to the stage auxiliary transport tunnel 2 in the stage level toward the ore body 12. The main transport tunnel 1 and the auxiliary transport tunnel 2 are arranged horizontally, and an outer-vein circular transport system consisting of the main transport tunnel 1-through-vein tunnel 3-stage auxiliary transport tunnel 2 is formed in the stage level; the outer-vein circular transport system is located in the footwall of the ore body 12. The traditional transportation forms of gently inclined medium-thick ore bodies are generally: single along-vein type (the chute is directly connected to the stage transport tunnel, and the mine car is loaded in the transport tunnel), along-vein plus through-vein type (in addition to setting the stage transport tunnel along the direction, a vertical through-vein tunnel is also arranged at a certain distance, CN 109083644 A is the form of transportation used in the patent) In the above-mentioned form of transportation, the ore throughput capacity is weak, and the traction direction of the electric locomotive needs to be changed, or the locomotive needs to be backed up to push the locomotive, which is prone to derailment; the present invention adopts an outer-vein circular transportation system, namely, the stage main transportation lane 1-the through-vein lane 3-the stage auxiliary transportation lane 2, which can realize that the electric locomotive does not need to turn around, has a strong ore throughput capacity, and can further increase the transportation capacity of gently inclined ore; compared with the traditional circular transportation lane, its along-vein transportation lane (stage main transportation lane 1) is arranged in the upper plate of the ore body and the lower plate of the ore body, however, the present invention makes use of the characteristics of the gentle inclination of the ore body and the long horizontal distance between the chute between adjacent sections, and the stage main transportation lane 1 (along-vein transportation lane) is arranged in the lower plate, which improves the efficiency, flexibility and economy of transportation.

[0042] In the stage auxiliary transport tunnel 2, along the vein tunnel 3, and in each section and the second-step mining area 11, a ramp connecting tunnel 8 is horizontally excavated toward the ore body 12 to the horizontal transport tunnel 4; the horizontal transport tunnel 4 is also arranged horizontally with the stage main transport tunnel 1, and a ramp 7 is excavated upward on the ramp connecting tunnel 8 to the ramp connecting tunnel 8 of the previous section or the previous stage. The ramp 7 is connected through the ramp connecting tunnel 8, and the ramp 7 is used to connect each section.

[0043] like Figures 2 to 3As shown, the horizontal transport tunnel 4 excavates multiple mining tunnels 6 in the direction of the ore body 12. The length of the mining tunnel 6 is 10 to 12 meters, ensuring that the shovel loader can fully accommodate the ore in the mining tunnel 6. The spacing between adjacent mining tunnels 6 is 8 to 10 meters. The end of the mining tunnel 6 excavates the rock drilling tunnel 5 along the direction a of the ore body. The rock drilling tunnel 5 is also arranged horizontally with the main transport tunnel 1 of the stage. The chute 9 is arranged on the side of the horizontal transport tunnel 4 of each section away from the rock drilling tunnel 5. The distance between adjacent chutes 9 in the direction a of the ore body is 150 to 200 meters, preferably 200 meters. The chute 9 is arranged vertically, and the chute 9 connects the ramp connecting tunnel 8 of this section located in the second-step mining area 11 to all tunnels at the bottom of this stage (including the main transport tunnel 1 of the stage, the auxiliary transport tunnel 2 of the stage, the vein tunnel 3 or the ramp connecting tunnel 8). As shown Figure 1 As shown, the first-step stope 10 and the second-step stope 11 of the same segment share a chute 9 in the strike direction a of the ore body.

[0044] S3, cutting:

[0045] Taking full advantage of the crushing characteristics of the ore body and surrounding rock, instead of excavating the cutting tunnel and cutting shaft separately, multiple rows of inclined cutting blastholes 16 are drilled directly at the predetermined position of the rock drilling tunnel 5 to perform blasting groove pulling; using the rock drilling tunnel 5 as a free space, the inclined cutting blastholes 16 facing each other are drilled to form a cutting groove A (such as Figure 4 As shown in the figure, the inclination angle of the blasthole gradually increases from the inside to the outside to increase the cutting efficiency and reduce the operating cost. To further increase the cutting efficiency, the cutting groove is formed by blasting twice; after the first blasting, the ore is loosened and taken out from the rock drilling tunnel 5, and then the second blasting is carried out to loosen and take out the ore again to ensure that 50% of the ore volume remains in the cutting groove.

[0046] Specifically, Figure 4 This is the overall layout diagram of the blastholes cut by the present invention. In the figure, ①-⑨ express that the blastholes are divided into 9 rows, ① represents the first row of blastholes, and so on, ⑨ represents the ninth row of blastholes. Figure 4 As shown, the cutting blasthole 16 is composed of inclined blastholes on the left and right sides. The blasthole angle of the first row of blastholes ① is about 35-45°, and then the blasthole angle of each row of blastholes is gradually increased to 90°; Figure 5 As shown, Figure 5 Schematic diagram of a single row of cutting blastholes of the present invention, each row of cutting blastholes 16 consists of three parallel blastholes, the spacing D between the blastholes is controlled in the range of 1.2 to 1.5 m, preferably 1.5 m, and the distance E between the blastholes and the boundary of the rock drilling tunnel 5 is controlled in the range of 0.5 to 0.8 m, preferably 0.5 m; the cutting blastholes 16 are blasted twice, the first blasting is blastholes ①-⑤, and after the ore is loosened, blastholes ⑥-⑨ are blasted.

[0047] S4, mining:

[0048] The stopes in the stage are mined in sections from top to bottom. In the same section, the first-step stope 10 is mined first, and then the second-step stope 11 is mined. Figure 6 As shown, Figure 6 The blast hole diagram of the present invention is that in the rock drilling tunnel 5, the mining blast hole 17 in the center of the double rock drilling is drilled, and the blasting is carried out with the cutting groove as the blasting free surface. 4-6 rows of blast holes are blasted each time, and the falling of the surrounding rock in the upper wall is monitored from the corresponding position of the mining tunnel 6. A manual electric scraper is used to shovel the ore from the rock drilling tunnel 5 and the mining tunnel 6 and pour it into the nearby chute 9;

[0049] In order to increase the range of the ore discharge opening as much as possible, the fan-shaped blastholes for mining in the first-step mining area 10 and the second-step mining area 11 are designed with double rock drilling centers. The spacing M between the rock drilling centers is preferably 1.5m, and the bottom distance N of the fan-shaped blastholes is controlled at 2.6-3m. Before the surrounding rock of the upper wall of the mining area falls off, it is necessary to ensure that the ore in the mining area is not empty when mining. After the surrounding rock of the upper wall of the mining area falls off, a large amount of ore can be discharged from the mining tunnel 6. When the waste rock 13 falling from the upper wall is mixed with the ore to cause depletion, that is, the ore grade is reduced, when the ore grade is reduced to the cut-off grade, the mining is stopped.

[0050] The present invention discloses a mining method for a gently inclined medium-thick ore body in which both the upper wall surrounding rock and the ore body are broken. Combining the characteristics of the gently inclined medium-thick ore body in which both the upper wall surrounding rock and the ore body are broken, the mining method of the present invention is creatively proposed, which can ensure the surrounding rock to fall to the maximum extent, and no longer need to dig cutting tunnels and skylights, thereby reducing the workload of mining; the rock drilling tunnel is arranged in the lower wall surrounding rock with good stability, avoiding the tunnel being arranged in the ore body and the upper wall surrounding rock, thereby ensuring the safety of the mining, cutting and recovery processes; the rock drilling tunnel is used as a free space, and the drilling Cutting grooves are formed by drilling inclined (gradually increasing angles) blastholes facing each other to increase cutting efficiency; barrier pillars and triangular pillars are set between the stopes between sections and the two stopes within the sections to prevent the falling ore from flowing into the ore outlet as much as possible and control the dilution during the ore discharge process; the main transportation lanes, auxiliary transportation lanes and vein-penetrating lanes are set up in the lower plate to form a lower plate circular transportation system, and large trackless shovel equipment is used to discharge the ore, which maximizes the production capacity of the stopes of gently inclined medium-thick ore bodies while ensuring safety. It solves the technical problems of the difficulty in balancing the safety and economy of traditional mining methods for such ore bodies and the high mining cost. It is suitable for promotion.

[0051] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A method for mining a gently inclined medium-thick ore body in which both the upper wall surrounding rock and the ore body are broken, characterized in that: The steps are: S1. Stope layout: along the ore body inclination direction (b), a stage is divided into multiple sections, and multiple stopes are set up in each section along the ore body strike direction (a), and barrier pillars (14) are left in the stopes between the sections; the stopes include a first-step stope (10) and a second-step stope (11), and in the same stope of the same section, the first-step stope (10) and the second-step stope (11) are set up continuously in the vertical direction (c) of the ore body, and a triangular pillar (15) is left between the first-step stope (10) and the second-step stope (11) in the same section; in the vertical direction (c) of the ore body within a stage, the first-step stope (10) and the second-step stope (11) are arranged at intervals; S2, mining approval: a stage main transport tunnel (1) is opened in the stage level in the direction of the ore body (12), a through-vein tunnel (3) is excavated in the stage main transport tunnel (1) in the direction of the ore body (12) to the stage auxiliary transport tunnel (2), the stage main transport tunnel (1) and the stage auxiliary transport tunnel (2) are arranged horizontally, and the stage main transport tunnel (1), the stage auxiliary transport tunnel (2) and the through-vein tunnel (3) form an outer-vein circular transport system at the stage level; In the stage auxiliary transport tunnel (2), along the vein tunnel (3), and in each segment and second-step stope (11), a ramp connecting tunnel (8) is horizontally excavated toward the ore body (12) to the horizontal transport tunnel (4); each ramp connecting tunnel (8) is connected through the excavated ramp (7); The horizontal transport tunnel (4) excavates multiple mining tunnels (6) in the direction of the ore body (12), and the end of the mining tunnel (6) excavates the rock drilling tunnel (5) along the strike direction (a) of the ore body. A chute (9) is arranged on the side of the horizontal transport tunnel (4) of each segment away from the rock drilling tunnel (5), and the chute (9) is connected to the ramp connecting tunnel (8) of the segment located in the second step stope (11) to the tunnel at the bottom of this stage; S3, cutting: drilling a plurality of rows of inclined cutting blastholes (16) toward the ore body (12) in the rock drilling tunnel (5); the rock drilling tunnel (5) is used as a free space, and the cutting blastholes (16) are drilled to form cutting grooves; S4, mining: The mining area within the stage is mined in sections from top to bottom. In the same section, the first-step mining area (10) is mined first, and then the second-step mining area (11) is mined. In the rock drilling tunnel (5), a mining blast hole (17) is drilled in the center of the double rock drilling, and the blasting is carried out with the cutting groove as the blasting free surface. At the same time, the falling of the upper wall surrounding rock is monitored from the mining tunnel (6) at the corresponding position, and the ore is shoveled from the rock drilling tunnel (5) and the mining tunnel (6) and poured into the chute (9) for mining. The mixing of waste rock (13) from the upper wall with the ore will cause the ore grade to decrease. When the ore grade is reduced to the cut-off grade, the mining is stopped.

2. The method for mining a gently inclined medium-thick ore body in which both the upper wall surrounding rock and the ore body are broken according to claim 1, characterized in that: In step S1, the cross-sections of the barrier pillar (14) and the triangular pillar (15) are both triangular, with a larger area on the side facing the lower wall of the ore body (e) and a gradually smaller area on the side facing the upper wall of the ore body (d).

3. The method for mining a gently inclined medium-thick ore body in which both the upper wall surrounding rock and the ore body are broken according to claim 1, characterized in that: In step S1, the stage height is 30-40 m, and one stage is divided into 3 or 4 sections. The exposed upper wall span of the first-step stope (10) is 25-30 m, and the exposed upper wall span of the second-step stope (11) is 10-15 m.

4. The method for mining a gently inclined medium-thick ore body in which both the upper wall surrounding rock and the ore body are broken according to claim 1, characterized in that: In step S2, the length of the mining tunnel (6) is 10 to 12 m, and the distance between adjacent mining tunnels (6) is 8 to 10 m.

5. The method for mining a gently inclined medium-thick ore body in which both the upper wall surrounding rock and the ore body are broken according to claim 1, characterized in that: In step S2, in the strike direction (a) of the ore body, the distance between adjacent chutes (9) is 150 to 200 m.

6. The method for mining a gently inclined medium-thick ore body in which both the upper wall surrounding rock and the ore body are broken according to claim 1, characterized in that: In step S3, the cutting blast holes (16) are inclined blast holes arranged opposite to each other, and the inclination angle of the cutting blast holes (16) gradually increases from the inside to the outside.

7. The method for mining a gently inclined medium-thick ore body in which both the upper wall surrounding rock and the ore body are broken according to claim 1, characterized in that: In step S3, the cutting blasthole (16) is composed of three parallel blastholes, the spacing between the blastholes is 1.2 to 1.5 m, and the distance between the blastholes and the boundary of the rock drilling tunnel (5) is 0.5 to 0.8 m.

8. The method for mining a gently inclined medium-thick ore body in which both the upper wall surrounding rock and the ore body are broken according to claim 1, characterized in that: In step S3, the cutting groove is formed by two blasting operations. After the first blasting operation, the ore is loosened and taken out from the rock drilling tunnel (5). Then, the second blasting operation is performed to loosen and take out the ore again, so as to ensure that 50% of the ore volume remains in the cutting groove.

9. The method for mining a gently inclined medium-thick ore body in which both the upper wall surrounding rock and the ore body are broken according to claim 1, characterized in that: In step S4, the center distance between the double rock drilling centers is 1.5 m, and the hole bottom distance of the fan-shaped blasthole is controlled at 2.6-3 m.

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