A gently inclined medium thick ore body multi-stope arrangement system and continuous filling mining method

Abstract

The present application relates to the technical field of mining, and particularly relates to a multi-stope arrangement system for gently inclined medium-thick ore body and a continuous filling mining method 。 The multi-stope arrangement system provided by the present application is arranged along the length direction of the sublevel ore drawing roadway in which the raise is located, multiple rows of cutting blast holes are arranged at intervals, the cutting slots are formed by blasting in sequence with the raise as a free surface, the fan-shaped blast holes are drilled in the trench rock drilling roadway at certain intervals, the fan-shaped blast holes are blasted with the cutting slots as a free surface, a stoping space is formed along the strike direction of the ore body, and the ore drawing efficiency is increased. The trench rock drilling roadway and the sublevel ore drawing roadway are arranged in the footwall surrounding rock, the operation on the filling body in the prior art is avoided, the ore drawing process is simplified, the mixing rate of the filling body is reduced, the ore transportation efficiency is increased by the sectional roadway and the stage transportation roadway, and the overall arrangement of the stope can realize simultaneous stoping and simultaneous filling of multiple stopes in the same stage, so that the continuity and intensity of the stoping and filling are greatly improved.

Description

Technical Field

[0001] This invention relates to the field of mining technology, and in particular to a multi-mining layout system and a continuous filling mining method for gently dipping, medium-thick ore bodies. Background Technology

[0002] In gently dipping, medium-thick ore bodies, during mining, caving ore cannot be naturally discharged by its own weight, resulting in significant ore loss in the footwall. Shallow-hole quarrying is commonly used, severely restricting mine production capacity. This leads to a series of technical problems, including large-scale mining and cutting work, difficulties in ore transportation, low mechanization levels, and low operational efficiency, making these deposits notoriously difficult to mine both domestically and internationally. With the development of modern mining technology and national requirements for environmental protection and green mine construction, backfilling mining methods have gained wider application. Common backfilling methods for mining these deposits include upward horizontal layered backfilling or access backfilling. These methods involve large-scale preparation work, often employ shallow-hole quarrying with small single-pass ore volumes, and poor continuity between mining and backfilling, further limiting the mining efficiency and intensity of these deposits. Summary of the Invention

[0003] (a) Technical problems to be solved In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a multi-mining layout system for gently inclined medium-thick ore bodies and a continuous filling mining method, which solves the technical problems of low mining strength and inability to achieve continuous filling in the traditional filling mining process of such mines.

[0004] (II) Technical Solution To achieve the above objectives, the main technical solutions adopted by the present invention include: In a first aspect, the present invention provides a multi-mining layout system for a gently dipping, medium-thick ore body. Multiple stopes are arranged along the dip direction of the ore body, with two adjacent stopes forming a group. The footwall of each stop is connected to a trench drilling roadway. Each trench drilling roadway is connected to multiple stratified ore extraction roadways. Each stratified ore extraction roadway is connected to a segment roadway via a stratified connecting roadway. The segment roadways are directly or indirectly connected to the stage transport roadway via a chute connecting roadway. A vertical riser is excavated at the upper boundary of each stop along the dip direction. The riser is connected to the stratified ore extraction roadways. Multiple rows of cutting blast holes are spaced apart along the length of the stratified ore extraction roadway containing the riser. Cutting grooves are formed by sequential blasting with the riser as the blasting free face. Fan-shaped blast holes are drilled at regular intervals within each trench drilling roadway. After blasting the fan-shaped blast holes with the cutting groove as the free face, a mining space is formed along the strike direction of the ore body.

[0005] Optionally, multiple rows of fan-shaped blast holes are set along the length of the trench drilling roadway. The spacing between two adjacent rows of fan-shaped blast holes is 1.8-2.2m. The side angle of each row of fan-shaped blast holes is 55°-65°. The extension line of the side angle of each row of fan-shaped blast holes corresponds to the width boundary of each stope in the inclination direction. After the fan-shaped blast holes are blasted, a trench is formed and ore collapses to form a mining space. The footwall of each stope is connected to the trench drilling roadway through the trench.

[0006] Optionally, the upper end of the well is connected to the side wall of the filling inclined shaft, and the two filling inclined shafts are connected by an inclined shaft connecting passage.

[0007] Optionally, the riser includes a cutting riser and a filling riser, which are connected longitudinally; the riser located in the ore body is the cutting riser, and the riser located in the hanging wall is the filling riser. The lower end of the cutting riser is connected to a corresponding stratified ore extraction roadway, and the upper end of the filling riser is connected to the sidewall of the filling inclined shaft.

[0008] Optionally, multi-stage stope groups are set along the dip direction of the ore body. Each stage stope group includes multiple sub-stope groups. Each sub-stope group includes a lower stope and an upper stope. The upper and lower stopes are set along the strike of the ore body. Stage pillars are reserved in adjacent stope groups.

[0009] Optionally, inter-mineral columns are reserved between the upper and lower mining blocks and between mining blocks of the same level. The horizontally arranged winding roadway penetrates multiple inter-mineral columns in the same stage. One end of the winding roadway is connected to the segmented roadway of the adjacent stage, and the other end of the winding roadway is connected to the inclined shaft connecting roadway.

[0010] Optionally, the layered connecting roadways and the segmented roadways are connected by layered ramps.

[0011] Optionally, the segmented roadways in the same stage can be connected by segmented ramps.

[0012] Secondly, embodiments of the present invention provide a method for continuous backfilling mining in multiple mining areas of gently dipping, medium-thick ore bodies, comprising the following steps. S1. Establish a multi-mining layout system for gently dipping, medium-thick ore bodies; S2. Using the cutting risers corresponding to the lower-level stopes of different segments as the blasting free face, blast sequentially to form a cutting groove along the length of the stratified ore extraction roadway; using the end of the cutting groove as the reference point, blast towards both ends along the length of the trench drilling roadway to form a mining space. S3. The lower-level stope is mined, and the ore in the stope collapses into the trench drilling roadway. It is then transported through the stratified ore extraction roadway to the stratified connecting roadway, and then through the stratified inclined ramp to the segment roadway. It is then transported through the ore pass connecting roadway to the ore pass and then to the stage transport roadway, or directly from the ore pass connecting roadway to the stage transport roadway. S4. After the lower stope is mined out, the lower stope, the stratified ore extraction roadways, the stratified connecting roadways, and the stratified inclined ramps are filled. S5. After the lower stope and related roadways are filled, repeat the operation on the upper stope according to steps S2-S3. S6. After the upper stope is mined out, the upper stope and the trench drilling roadway are filled.

[0013] Optionally, before S6 backfilling, a backfilling retaining wall is installed at the connection between the trench drilling roadway and the stratified ore extraction roadway.

[0014] (III) Beneficial Effects The beneficial effects of this invention are as follows: In this invention, a multi-mining layout for a gently dipping, medium-thick ore body involves multiple rows of cutting blast holes spaced along the length of the stratified ore extraction roadways where the raise is located. Cutting grooves are formed by sequential blasting using the raise as the free blasting face. Fan-shaped blast holes are drilled at regular intervals within the trench drilling roadways. These fan-shaped blast holes, blasted using the cutting grooves as the free face, form a mining space along the strike of the ore body, increasing ore extraction efficiency. The trench drilling roadways and stratified ore extraction roadways are arranged in the footwall surrounding rock, avoiding operations on the backfill material as in existing technologies, while simplifying the ore extraction process and reducing the mixing rate of the backfill material. The segmented roadways and staged transport roadways increase ore transportation efficiency. The overall layout of the mining areas allows for simultaneous mining and backfilling of multiple mining areas within the same stage, greatly improving the continuity and intensity of mining and backfilling. Attached Figure Description

[0015] Figure 1 This is a schematic diagram illustrating the operational principle of a continuous backfilling mining method for gently dipping, medium-thick ore bodies in multiple mining areas according to the present invention. Figure 2 for Figure 1 Sectional view I-I; Figure 3 for Figure 1 Sectional view II-II; Figure 4 This is a schematic diagram of the cutting process. Figure 5 This is a diagram showing the arrangement of fan-shaped blast holes.

[0016] [Explanation of Labels in the Attached Image] 1: Stage transport roadway; 2: Sectional roadway; 3: Layered connecting roadway; 4: Layered ore extraction roadway; 5: Trench drilling roadway; 6: Sectional ramp; 7: Layered ramp; 8: Pass connecting roadway; 9: Pass; 10: Cutting riser; 11: Filling riser; 12: Coiled roadway; 13: Filling inclined shaft; 14: First filling body; 15: Second filling body; 16: Stage pillar; 17: Mine room pillar; 18: Filling retaining wall; 19: Inclined shaft connecting roadway; 20: Cutting blast hole; 21: Fan-shaped blast hole. Detailed Implementation

[0017] To better explain and facilitate understanding of the present invention, a detailed description of the invention is provided below with reference to the accompanying drawings and specific embodiments. In this document, directional terms such as "upper," "lower," etc., are used interchangeably with other directional terms. Figure 1 The orientation is used as a reference.

[0018] This invention proposes a multi-stop layout system and continuous backfilling mining method for gently dipping, medium-thick ore bodies. It employs vertically segmented stopes, with fan-shaped blast holes used for ore extraction, increasing efficiency. Two layers of trenching and drilling roadways, along with stratified ore extraction roadways, are arranged in the footwall to avoid working on the backfill, simplifying the extraction process and reducing backfill contamination. This allows for layered mining, where after the lower stope is mined and the stopes, stratified ramps, trenching, and stratified ore extraction roadways are backfilled, the next stope can be prepared for mining, enabling multi-stop mining with high intensity. The "one-off" mining sequence, with high-strength backfill material used in the first step, prevents backfill contamination during the second stage, controlling ore dilution. Simultaneous mining and backfilling of multiple stopes within the same phase significantly improves the continuity and intensity of mining and backfilling.

[0019] To better understand the above technical solutions, 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 drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0020] Example 1: Reference Figure 1 and Figure 3 A multi-mining layout system for a gently dipping, medium-thick ore body is described, comprising multi-stage stopes arranged along the dip direction of the ore body. Each stage of the stope includes multiple sub-stopes, each sub-stop forming a group. Each group of stopes includes a lower stope and an upper stope, with each upper stope and each lower stope positioned along the strike of the ore body. The dip direction of the ore body is the slope direction; the dip direction of the ore body is as follows: Figure 1 As indicated by arrow 'a', the direction of the ore body's strike is as follows: Figure 3 As indicated by arrow b; the height direction is as follows: Figure 1 As indicated by arrow c; the hanging wall of the ore body is located above the stope, as shown in the image. Figure 1 As shown in d; the footwall of the ore body is located above the stope, as... Figure 1As shown in Figure e, the stage transport roadway 1, segment roadway 2, layered connecting roadway 3, layered ore extraction roadway 4, trench drilling roadway 5, segmented ramp roadway 6, layered ramp roadway 7, ore pass connecting roadway 8, and ore pass 9 are located in the footwall of the ore body; the filling inclined shaft 13 and inclined shaft connecting roadway 19 are located in the hanging wall of the ore body.

[0021] Reference Figure 1 Each stope's footwall is connected to the trench drilling roadway 5 via a trench. The trench drilling roadway 5 runs in the same direction as the ore body. The layered connecting roadway 3 runs parallel to the trench drilling roadway 5. The layered connecting roadway 3 and the trench drilling roadway 5 are connected by multiple layered ore extraction roadways 4. Each layered ore extraction roadway 4 is perpendicularly connected to both the layered connecting roadway 3 and the trench drilling roadway 5. The direction of the layered ore extraction roadway 4 is the direction of the ore body's dip a. One of the layered ore extraction roadways 4, preferably located in the middle of the stope, is equipped with a raise and multiple rows of cutting blast holes 20. This raise is set along the height direction c and is located at the boundary of the stope. Each row of cutting blast holes 20 is spaced apart along the length of the layered ore extraction roadway 4. Within each trench drilling roadway 5, fan-shaped blast holes 21 are drilled at regular intervals. Using the riser as the free blasting face, cutting grooves are formed by blasting in sequence. The fan-shaped blast holes are then blasted using the cutting grooves as the free face, forming a mining space along the strike direction b of the ore body.

[0022] Each stope has a corresponding trench drilling tunnel 5 at its lower part.

[0023] Reference Figure 4 The cutting blast hole 20 is preferably located in the middle layered ore extraction roadway 4, because the cutting groove is carried out in the middle layered ore extraction roadway 4. Its blasting conditions are to ensure that there is sufficient free face and compensation space for subsequent mining, so that the middle layered ore extraction roadway 4 is extended to the left boundary of the stope.

[0024] The stratified ore extraction roadway 4 is connected to the segmented roadway 2 via the stratified connecting roadway 3. The segmented roadway 2 is directly or indirectly connected to the stage transport roadway 1 via the chute connecting roadway 8.

[0025] Reference Figure 1 Stage pass 9 is located away from the footwall, and is connected to the ore pass 8 by the section roadway 2. Ore pass 9 not only meets the ore transportation needs of this stage, but also, by connecting with the previous stage, can alleviate the ore transportation pressure between the first and second stops of the upper stage, and reduce the transportation pressure between the stage stops.

[0026] Reference Figure 1 and Figure 5Multiple rows of fan-shaped blast holes 21 are installed along the length of the trench drilling roadway 5. The spacing between two rows of fan-shaped blast holes 21 is 1.8-2.2m, and the side angle of each fan-shaped blast hole 21 is 55°-65°. The extension line of the side angle of each fan-shaped blast hole 21 corresponds to the width boundary of the inclined direction of each stope. After blasting, the fan-shaped blast holes 21 form a trench, which serves as the mining space. The footwall of each stope is connected to the trench drilling roadway 5 through the trench. After multiple tests, it was found that a spacing of 1.8-2.2m between two fan-shaped blast holes 21 and a side angle of 55°-65° for each fan-shaped blast hole 21 result in the most stable trench formation and the best blasting effect. This also provides sufficient space and inclination angle, allowing the collapsed ore to slide into the trench drilling roadway 5 by its own weight, avoiding ore loss in the footwall, improving mine production capacity, and increasing work efficiency.

[0027] Reference Figure 1 and Figure 3 The upper end of the well is connected to the side wall of the filling inclined shaft 13, and the two filling inclined shafts 13 are connected by the inclined shaft connecting passage 19. The filling inclined shaft 13 is a passage for laying the filling pipeline, which is used to transport the filling material.

[0028] A filling inclined shaft 13 with the same dip angle as the ore body is arranged 6-10m above the hanging wall of each stope. Along the length of the stope, the filling inclined shaft 13 is located at a distance of one stratified ore extraction roadway 4 offset from the center of the stope towards the two inter-stope pillars 17. Along the strike direction of the ore body, a filling inclined shaft connecting roadway 19 is excavated at the middle position of the inter-stope pillars 17 at the stage level to reach the filling inclined shaft 13 on the hanging wall of the ore body.

[0029] Reference Figure 2 The well includes a cutting well 10 and a filling well 11, which are longitudinally connected. The well portion located in the ore body is the cutting well 10, and the well located in the hanging wall is the filling well 11. The lower end of the cutting well 10 is connected to a corresponding stratified ore extraction roadway 4, and the upper end of the filling well 11 is connected to the side wall of the filling inclined shaft 13.

[0030] Reference Figure 3 Multi-stage stope groups are set along the dip direction of the ore body. Each stage stope group includes multiple sub-stope groups. Each sub-stope group includes a lower stope and an upper stope. The upper stope and the lower stope are set along the strike of the ore body. Stage pillars 16 are reserved in adjacent stage stope groups.

[0031] Reference Figure 1 and Figure 3Interlocking columns 17 are reserved between the upper and lower stopes and other stopes at the same level along the ore body's strike (i.e., the length of the stope). A horizontally arranged connecting roadway 12 penetrates multiple interlocking columns 17 at the same stage. One end of the connecting roadway 12 connects to the segmented roadway 2 of the adjacent stage, and the other end connects to the inclined shaft connecting roadway 19. The connecting roadway 12 is for personnel passage into the inclined shaft connecting roadway 19, and serves to install and fill the inclined shaft 13 pipeline and for subsequent maintenance.

[0032] The stops are arranged along the strike of the ore body, each stop being 40-60m long. Multiple stops are vertically divided along the dip direction of the ore body, for example... Figure 1 In the diagram, ①, ②, ③, ④, ⑤, and ⑥ represent the first, second, third, fourth, fifth, and sixth mining stops, respectively. Mining stops ① and ② are prepared and mined using the first segmented roadway; mining stops ③ and ④ are prepared and mined using the second segmented roadway; and mining stops ⑤ and ⑥ are prepared and mined using the third segmented roadway.

[0033] Reference Figure 1 and Figure 3 Each stope is 10-15m wide. A 6-8m inter-stop pillar 17 is provided between adjacent stops along the ore body strike, and a 6-8m stage pillar 16 is provided between two stages. Every 6-8m along the ore body strike, a layered ore extraction roadway 4, a layered connecting roadway 3, and a trench drilling roadway 5 are arranged, with a distance of 10-15m between them. This arrangement satisfies the stability and safety between stops, ensuring that construction can proceed simultaneously at different layers within the same stage. Figure 1 The first, third, and fifth stops are constructed simultaneously within the same stage; at the same time, the remaining stages of the first, third, and fifth stops along the dip direction can also be constructed concurrently; furthermore, the first, third, and fifth stops can be constructed along the direction of the ore body, providing safety assurance while greatly improving excavation efficiency. After the first, third, and fifth stops are mined, they can be filled simultaneously, improving filling efficiency. Then, the second, fourth, and sixth stops are mined and filled.

[0034] Reference Figure 1 The layered connecting roadway 3 and the segmented roadway 2 are connected by the layered ramp 7.

[0035] A segmented roadway 2 is responsible for the mining and preparation work of two adjacent stopes, that is, the mining between adjacent upper and lower stopes, which saves the space of the footwall, increases the stability of the footwall, and ensures the continuity of transportation between segmented roadways 2; the segmented roadways 2 in the same stage are connected by segmented ramps 6, which allow the loader to pass between the segments, as well as personnel to pass through, transport materials, and provide ventilation.

[0036] Example 2: Reference Figure 1 , Figure 2 and Figure 3 A continuous backfilling mining method for multiple mining areas in a gently dipping, medium-thick ore body includes the following steps. S1. Establish a multi-mining layout system for gently dipping, medium-thick ore bodies according to Example 1.

[0037] S2. Using the cutting wells 10 corresponding to the lower-level stopes of different segments as the blasting free face, blast sequentially to form a cutting groove along the length of the stratified ore extraction roadway 4; using the end of the cutting groove as the reference point, blast towards both ends of the stope along the length of the trench drilling roadway 5 to form a mining space.

[0038] Within the stratified ore extraction roadway 4 in the middle of each stope, a riser is excavated upwards from the right boundary of the stope to the hanging wall filling inclined shaft 13. The riser portion within the ore body serves as the cutting riser 10, and the riser portion located in the hanging wall surrounding rock serves as the filling riser 11. The stratified ore extraction roadway 4 in the middle of the stope is extended to the left boundary of the stope. Parallel upward-facing medium-deep holes are arranged in the roadway to the left of the cutting riser 10, and cutting grooves are formed by sequential blasting with the cutting riser 10 as the blasting free face.

[0039] S3. The lower stope is mined. The ore in the stope collapses into the trench drilling roadway 5. A loader is used to load the ore through the stratified ore extraction roadway 4. The ore is then transported through the stratified ore extraction roadway 4 to the stratified connecting roadway 3, and then through the stratified inclined ramp 7 to the segment roadway 2. The ore is then transported through the ore pass connecting roadway 8 to the ore pass 9, and then to the stage transport roadway 1, or directly from the ore pass connecting roadway 8 to the stage transport roadway 1.

[0040] The lower stopes of each segment within a phase can be mined simultaneously. After the lower stopes of each segment are mined, filled, and maintained, the upper stopes of each segment are then prepared, cut, and mined.

[0041] S4. After the lower stope is mined out, the lower stope and the stratified ore extraction roadway 4, the stratified connecting roadway 3 and the stratified inclined ramp 7 are filled.

[0042] After the lower stope is mined and filled, the upper stope is prepared for mining.

[0043] S5. After the lower stope and related roadways are filled, repeat the operation on the upper stope according to steps S2-S3.

[0044] S6. After the upper stope is mined out, the upper stope and the trench drilling roadway 5 are filled.

[0045] Before S6 is filled, a filling retaining wall 18 is set at the connection between the rock drilling roadway 5 and the stratified ore extraction roadway 4. The function of the filling retaining wall 18 is to prevent the loss of filling material.

[0046] The commonly used backfilling methods for mining deposits are upward horizontal layered backfilling or access backfilling. These methods involve a large amount of preparation work, often using shallow-hole ore extraction with small single-pass ore extraction volumes, and poor continuity between mining and backfilling, further limiting the mining efficiency and intensity of such deposits. Furthermore, these methods involve shoveling and transporting ore on the backfill body, and after backfilling, the surface of the backfill body needs to be hardened, making the production process more complex. Moreover, due to difficulties in ensuring the quality of hardening, the backfill body often becomes contaminated, leading to dilution and resulting in actual dilution levels far exceeding design specifications. After the stope is mined out, backfilling pipelines are laid along each backfilling inclined shaft 13, and backfilling is carried out through the central backfilling inclined shaft 13 of each stope. Before backfilling, retaining walls are backfilled in the layered ore extraction roadways 4. Stopes within a stage can be backfilled simultaneously. The lower stopes in each section are backfilled using a cement-tailings mixture with a lime-sand ratio of 1:4; the upper stopes in each section are backfilled using a cement-tailings mixture with a lime-sand ratio of 1:20. The first step, using a high-ash-sand ratio backfill, aims to create a high-strength backfill body, facilitating the second stage of mining. If the strength from the first step is insufficient, the backfill will break down and become mixed in during the second stage, affecting mining performance. During the second stage, with high-strength backfill on both sides, a low-proportion, low-strength backfill can be used to reduce costs, thus lowering overall mining costs. The second stage of mining operates on the first stage's base surface. Since loader transport is required during this stage, the load is significant. Therefore, all lower-level roadways are backfilled to improve safety. Because the top does not involve corresponding support in the second stage, only the upper stope and the trench drilling roadways need backfilling, reducing backfill material and saving costs.

[0047] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0050] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0051] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A multi-mining layout system for gently dipping, medium-thick ore bodies, characterized in that, A multi-stage stope is constructed along the dip direction of the ore body. The footwall of each stope is connected to a trench drilling roadway (5). Each trench drilling roadway (5) is connected to multiple stratified ore extraction roadways (4). Each stratified ore extraction roadway (4) is connected to a segmented roadway (2) via a stratified connecting roadway (3). The segmented roadway (2) is directly or indirectly connected to a stage transport roadway (1) via a chute connecting roadway (8). The upper part of each stope along the dip direction... A vertical well is excavated at the boundary, which is connected to a layered ore extraction roadway (4). Multiple rows of cutting blast holes (20) are set at intervals along the length of the layered ore extraction roadway (4) where the well is located. Cutting grooves are formed by blasting the well as the free surface of the blasting. Fan-shaped blast holes (21) are drilled at certain intervals in each trench drilling roadway (5). After the fan-shaped blast holes (21) are blasted as the free surface of the cutting groove, a mining space is formed along the direction of the ore body. The upper end of the courtyard is connected to the side wall of the filling inclined shaft (13), and the two filling inclined shafts (13) are connected by the inclined shaft connecting passage (19); The well includes a cutting well (10) and a filling well (11), which are longitudinally connected. The well portion located in the ore body is the cutting well (10), and the well located in the hanging wall is the filling well (11). The lower end of the cutting well (10) is connected to a corresponding stratified ore extraction roadway (4), and the upper end of the filling well (11) is connected to the side wall of the filling inclined shaft (13). Multi-stage stopes are set along the dip direction of the ore body. Each stage stope includes multiple sub-stopes. Each sub-stope is a group. Each group of stopes includes a lower stope and an upper stope. Each upper stope and each lower stope are set along the strike of the ore body. Stage pillars (16) are reserved in adjacent stope groups. The upper and lower mining rooms are reserved with inter-mining columns (17) between them and adjacent mining rooms on the same level. The horizontally arranged spiral roadway (12) penetrates multiple inter-mining columns (17) in the same stage. One end of the spiral roadway (12) is connected to the segmented roadway (2) in the adjacent stage, and the other end of the spiral roadway (12) is connected to the inclined shaft connecting roadway (19).

2. The multi-mining layout system for gently dipping, medium-thick ore bodies according to claim 1, characterized in that, Multiple rows of fan-shaped blast holes (21) are set along the length of the trench drilling roadway (5). The distance between two adjacent rows of fan-shaped blast holes (21) is 1.8-2.2m. The side angle of each row of fan-shaped blast holes (21) is 55°-65°. The extension line of the side angle of each fan-shaped blast hole (21) corresponds to the width boundary of the inclined direction of each stope. After the fan-shaped blast holes (21) are blasted, a trench is formed and the ore collapses to form a mining space. The footwall of each stope is connected to the trench drilling roadway (5) through the trench.

3. The multi-mining layout system for gently dipping, medium-thick ore bodies according to claim 1, characterized in that, The layered connecting roadway (3) is connected to the segmented roadway (2) via a layered ramp (7).

4. The multi-mining layout system for gently dipping, medium-thick ore bodies according to claim 1, characterized in that, The segmented roadways (2) in the same stage are connected by segmented ramps (6).

5. A method for continuous backfilling mining of gently dipping, medium-thick ore bodies in multiple mining areas, characterized in that, Includes the following steps: S1. Establish a multi-mining layout system for gently dipping, medium-thick ore bodies as described in any of claims 1-4; S2. Using the cutting wells (10) corresponding to the lower-level ore houses of different segments as the blasting free face, blast sequentially to form a cutting groove along the length of the layered ore extraction roadway (4); using the end of the cutting groove as the reference point, blast along the length of the trench drilling roadway (5) towards both ends of the ore house to form the mining space. S3. The lower-level stope is mined, and the ore in the stope collapses into the trench drilling roadway (5), is transported to the layered connecting roadway (3) via the layered ore extraction roadway (4), and then to the segmented roadway (2) via the layered inclined ramp (7), and then to the ore pass (9) via the ore pass connecting roadway (8) and then to the stage transport roadway (1), or directly to the stage transport roadway (1) via the ore pass connecting roadway (8); S4. After the lower stope is mined out, the lower stope, the stratified ore extraction roadway (4), the stratified connecting roadway (3) and the stratified inclined ramp (7) are filled. S5. After the lower stope and related roadways are filled, repeat the operation on the upper stope according to steps S2-S3. S6. After the upper stope is mined out, the upper stope and the trench drilling roadway (5) are filled.

6. The continuous backfilling mining method for gently dipping, medium-thick ore bodies according to claim 5, characterized in that, Before the S6 filling, a filling retaining wall (18) is set at the connection between the trench drilling roadway (5) and the layered ore extraction roadway (4).

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