A long drift structure of inverted trapezoid under steeply inclined thin vein

Abstract

The application discloses a steeply inclined thin vein downward inverted trapezoidal long drift structure and belongs to the technical field of mine engineering. A main trunk stope connecting passage is arranged as a common passage of multiple sublevel stopes, and an opening is formed on the inner wall of the main trunk stope connecting passage to be connected with other sublevel stopes of the same section, so that the multiple sublevel stopes are connected with the sectional transportation roadway through the main trunk connecting passage, a sublevel stope connecting passage is avoided from being excavated to the sectional transportation roadway in each sublevel stope, and thus the repeated excavation engineering quantity is reduced, and the cost and construction period are reduced.

Description

Technical Field

[0001] This application belongs to the field of mining engineering technology, and in particular relates to a downward inverted trapezoidal long access structure for steeply inclined thin veins. Background Technology

[0002] When the down-advance mining technology is applied to steeply dipping thin veins, each stratified stope requires the separate excavation of a complete stope connection roadway to connect with intermediate or subgrade haulage roadways. Because steeply dipping thin veins have a large number of strata, this independent excavation method generates a significant amount of roadway engineering work, consuming substantial human and material resources and extending the construction period, making it difficult to meet the demands of efficient mining. Utility Model Content

[0003] In view of the technical problems existing in the background art, this application provides a downward inverted trapezoidal long access structure for steeply inclined thin veins, including: A multi-layered stope is provided, which is vertically stacked along a steeply dipping vein, and the multi-layered stopes form a segment. Isolation pillars are set between the original upward mining area and the current downward mining area; The intermediate transport roadway is set at the same horizontal level as the isolation pillar and extends along the strike of the ore body; The segmented transport roadway is located within the segment and is on the same horizontal plane as any of the stratified mining areas in that segment. The main mining area connecting roadway connects one end of the main mining area connecting roadway to the segmented transport roadway and the other end to the layered mining area, and the layered mining area and the segmented transport roadway are on the same horizontal plane. The stratified stope connecting road is connected at one end to the inner wall of the main stope connecting road, and at the other end to other stratified stopes in the same section.

[0004] In some embodiments, the connection opening between the main stope connecting road and the corresponding stratified stope is located in the center of the stratified stope.

[0005] In some implementations, the vertical projections of the connecting openings of adjacent stratified mining areas do not overlap.

[0006] In some embodiments, the distance between the vertical projections of the connecting openings of adjacent stratified mining areas along the ore body direction is L, and the distance L is such that the slope of the stratified mining area connecting channel formed between the connecting opening of the stratified mining area and another connecting opening located on the inner wall of the main mining area connecting channel corresponding to the connecting opening is not greater than a preset value.

[0007] In some embodiments, a turning space is provided at the channel interface of the layered stope connecting roadway to the main stope connecting roadway, and the width of the turning space in the horizontal direction is greater than the width of the main stope connecting roadway.

[0008] In some implementations, the turning spaces between the multiple stratified mining area connecting tunnels do not overlap.

[0009] In some embodiments, two adjacent channel interfaces are located on the inner walls of different sides of the main mining area connecting roadway.

[0010] In some embodiments, the cross-section of the stratified mining area is an inverted trapezoid.

[0011] In some embodiments, the upper sidewall of the inverted trapezoidal cross-section is provided with densely arranged anchor bolts, including pipe joint anchor bolts, or mortar anchor bolts and pipe joint anchor bolts.

[0012] In some implementations, the anchor bolts of adjacent stratified mining areas are arranged in an alternating pattern.

[0013] This application provides a downward-inverted trapezoidal long access structure for steeply inclined thin veins, including: A stratified stope is set up vertically along a steeply dipping vein, and multiple stratified stopes form a segment. Isolation pillars are set between the original upward mining area and the current downward mining area; The intermediate transport roadway is set at the same level as the isolation pillars and extends along the strike of the ore body; The segmented transport roadway is located within the segment and is on the same horizontal plane as any of the stratified mining areas in that segment. The main mining area connecting roadway connects to the sectional transport roadway at one end and to the layered mining area at the other end, and the layered mining area and the sectional transport roadway are on the same horizontal plane. The stratified stope connecting road is connected at one end to the inner wall of the main stope connecting road, and at the other end to other stratified stopes in the same section.

[0014] By setting up a main mining area connecting roadway as a shared passage for multiple mining areas, and opening an opening in the inner wall of the main mining area connecting roadway to connect other mining areas in the same segment, multiple mining areas can be connected to the segment transport roadway through the main roadway. This avoids the need to excavate a mining area connecting roadway to the segment transport roadway in each mining area, thereby reducing the amount of repeated excavation work, lowering costs and construction period. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall stope layout of a steeply inclined thin vein with a downward inverted trapezoidal long access structure provided in the embodiments of this application; Figure 2 This is a schematic diagram of the layout of the opening area between the connecting roadway and the stope in a steeply inclined thin vein downward trapezoidal long access structure provided in the embodiments of this application; Figure 3 This is a schematic diagram of the layout of a stopway connecting roadway in a steeply inclined thin vein with a downward inverted trapezoidal long access structure, as provided in an embodiment of this application. Figure 4 This is a schematic diagram from another angle of the layout of a stopway with a steeply inclined thin vein and an inverted trapezoidal long access structure, as provided in the embodiments of this application. Figure 5 This is a schematic diagram of the filling and support method for an inverted trapezoidal stope with a steeply inclined thin vein and a downward inverted trapezoidal long access structure provided in the embodiments of this application; Figure 6 This is a schematic diagram of the arrangement of anchor bolts and steel mesh in the first mining layer of a method for filling and supporting a steeply inclined thin vein with a downward inverted trapezoidal long access structure provided in the embodiments of this application. Figure 7 This is a schematic diagram of the arrangement of anchor bolts and steel mesh in other layers of a downhill trapezoidal long access structure for a steeply inclined thin vein according to an embodiment of this application. Figure 8 This is a partial schematic diagram of the spacing L calculation parameters for a downward inverted trapezoidal long access structure for a steeply inclined thin vein provided in an embodiment of this application; Figure 9 This is another schematic diagram showing the calculation parameters of the spacing L of a steeply inclined thin vein downward inverted trapezoidal long access structure provided in the embodiments of this application.

[0016] Explanation of reference numerals in the attached drawings: 1. Intermediate haulage roadway; 2. Sub-section haulage roadway; 31. First-level stope; 32. Second-level stope; 33. Third-level stope; 34. Fourth-level stope; 41. Main stope connecting roadway; 42. First-level stope connecting roadway; 43. Third-level stope connecting roadway; 44. Fourth-level stope connecting roadway; 5. Isolation pillar; 6. Inverted trapezoidal stope; 7. Backfill; 8. Pass; 9. Low-strength backfill; 10. High-strength backfill; 11. Pipe joint anchor; 12. Surrounding rock; 13. Grouting anchor; 14. Hanging bar; 15. Crushed stone layer; 16. Longitudinal reinforcement; 17. Transverse reinforcement; 18. Anchor mesh; 19. Double reinforcement bar. Detailed Implementation

[0017] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0018] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0019] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0020] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0021] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0022] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0023] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0024] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" 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. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0025] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0026] In some implementations, refer to Figures 1 to 4 A steeply dipping thin vein with a downward-inverted trapezoidal long access structure, comprising: Layered stopes are constructed by stacking multiple layered stopes vertically along steeply dipping veins, with multiple layered stopes forming a section; for details, refer to... Figure 1 and Figure 2 A stratified stope is an independent mining unit stacked vertically along a steeply dipping vein. For example, in... Figure 1 The four stratified mining areas are designated as the first stratified mining area 31, the second stratified mining area 32, the third stratified mining area 33, and the fourth stratified mining area 34, and these four stratified mining areas constitute a mining section. The boundary of each stratified mining area is consistent with the continuous occurrence section of the ore body, the length matches the strike of the continuous ore body section, and the width is equal to the actual thickness of the ore body. It is the core working space for rock drilling, blasting, and ore recovery.

[0027] Isolation pillars are installed between the original upward mining area and the current downward mining area; for details, refer to... Figure 1 The area where backfill 7 is located is a legacy area from the upward mining route, while the area where the subgrade mining site is located is the current downward trapezoidal long-path mining area. The strength of backfill 7 in the original upward mining area has been weakened by long-term stress, and there is stress concentration at the boundary of the goaf. If it is directly connected to the downward mining area, the downward tunneling will cause stress field superposition, leading to the instability and collapse of the original backfill. The isolation pillar 5 is set between the two to block the stress transmission between the original goaf and the current mining area, avoid the spread of risks, and at the same time provide stable boundary conditions for the downward mining area, ensuring the safety of the conversion process.

[0028] The intermediate transport roadway is set at the same horizontal level as the isolation pillars and extends along the strike of the ore body; for details, refer to... Figure 1 and Figure 2The middle transport roadway 1 and the isolation pillar 5 are on the same horizontal plane and extend along the ore body. The left side of the middle transport roadway 1 is adjacent to the original upward mining area, and the right side is connected to the sub-transport roadway 2 and the main mining area connecting roadway 41 through the chute 8. It is the core transport hub at the bottom of the original upward mining area.

[0029] Segmented transport roadways are located within segments and are on the same horizontal plane as any of the layered stopes within that segment; refer to Figure 1 , Figure 3 The segmented haulage roadway 2 is located within a specific mining segment and is on the same horizontal plane as any of the stratified stopes within that segment. This avoids a height difference between the haulage roadway and the stopes, reduces the climbing resistance during ore transfer, improves the transport efficiency of equipment such as loaders, and provides conditions for the subsequent formation of the horizontal main stope connecting roadway 41. In this example, the segmented haulage roadway 2 is on the same horizontal plane as the second stratified stope 32, which is preferably closer to the middle of the segment. In other examples, the segmented haulage roadway 2 can also be on the same horizontal plane as the third stratified stope 33. One side of the segmented haulage roadway 2 is connected to the intermediate haulage roadway 1 via a chute 8, and the other side is directly connected to the main stope connecting roadway 41.

[0030] The main stope connecting roadway connects to the sectional transport roadway at one end and to the layered stope at the other end, with the layered stope and the sectional transport roadway on the same horizontal plane; (Refer to...) Figure 1 , Figure 3 and Figure 4 The main stope connecting roadway 41 connects to the segmented transport roadway 2 at one end and directly connects to the second layered stope 32 at the same level as the segmented transport roadway 2 at the other end. It is the opening mother roadway for all the layered stope connecting roads in this segment, that is, the other layered stope connecting roads all open from its inner wall.

[0031] As the core channel for ore collection and equipment transfer, the horizontal layout avoids the safety risks of equipment operation in inclined roadways, while ensuring efficient transfer of ore by its own weight or by the horizontal pushing of a loader. The main stope connecting roadway 41 serves as a shared channel for multiple stratified stopes, connecting them to the sectional transport roadways. This avoids the need to excavate a separate connecting roadway for each stratified stope into the sectional transport roadway, thereby reducing redundant excavation work, lowering costs, and shortening the construction period.

[0032] The stratified stope connecting passage is connected at one end to the inner wall of the main stope connecting passage, and at the other end to other stratified stopes in the same section. For details, refer to... Figure 3 and Figure 4In the attached diagram, the inter-level stope connecting roads can be represented as the inclined roadway structure of the first inter-level stope connecting roadway 42, the third inter-level stope connecting roadway 43, and the fourth inter-level stope connecting roadway 44. Among them, the second inter-level stope connecting roadway is the main stope connecting roadway 41. One end of each inter-level stope connecting roadway opens into the inner wall of the main stope connecting roadway 41, and the other end connects to other inter-level stopes in the same segment, that is, stopes that are not at the same level as the segment transport roadway. Moreover, the opening area of ​​the connecting roadway of the next lower level can be located inside the connecting roadway of the previous level, such as the fourth inter-level stope connecting roadway 44 opening into the third inter-level connecting roadway 43.

[0033] The design of the lower level opening located within the upper level connecting roadway allows for shared roadway use, further reducing the amount of excavation, and also avoids the problem of excessively steep slopes that might result from constructing inclined roadways across two levels of mining areas.

[0034] This application provides a downward-inverted trapezoidal long access structure for steeply inclined thin veins, including: A stratified stope is set up vertically along a steeply dipping vein, and multiple stratified stopes form a segment. Isolation pillars are set between the original upward mining area and the current downward mining area; The intermediate transport roadway is set at the same level as the isolation pillars and extends along the strike of the ore body; The segmented transport roadway is located within the segment and is on the same horizontal plane as any of the stratified mining areas in that segment. The main mining area connecting roadway connects to the sectional transport roadway at one end and to the layered mining area at the other end, and the layered mining area and the sectional transport roadway are on the same horizontal plane. The stratified stope connecting road is connected at one end to the inner wall of the main stope connecting road, and at the other end to other stratified stopes in the same section.

[0035] By setting up a main mining area connecting roadway as a shared passage for multiple mining areas, and opening an opening in the inner wall of the main mining area connecting roadway to connect other mining areas in the same segment, multiple mining areas can be connected to the segment transport roadway through the main roadway. This avoids the need to excavate a mining area connecting roadway to the segment transport roadway in each mining area, thereby reducing the amount of repeated excavation work, lowering costs and construction period.

[0036] In some implementations, refer to Figures 1 to 3 The connection opening between the main stope connecting roadway and the corresponding stratified stope is located in the center of the stratified stope. Specifically, the stratified stope corresponding to the main stope connecting roadway 41 is the second stratified stope 32, and the connection opening between the two is... Figure 2 , Figure 3The connection port between the end of the main stope connecting roadway 41 and the second-level stope 32 is centrally located along the length of the second-level stope 32, that is, at the midpoint of the stope along the strike of the ore body. The width of the opening is the same as the cross-sectional width of the main stope connecting roadway 41, accommodating the passage of equipment such as loaders. With the opening located in the center, the stope can be symmetrically advanced from the middle to both sides, such as... Figure 3 The mining direction of the second-level mining area 32 can be a two-way advance method from the middle to the left and right, so that the mining cycle of both mining areas is equal, while reducing the single-sided transfer time, which is suitable for the high-efficiency ore extraction requirements of thin veins.

[0037] In some implementations, refer to Figures 2 to 4 The vertical projections of the connecting openings of adjacent layered stopes do not overlap. Specifically, the connecting openings of adjacent layered stopes refer to the connection ports between each layered stope and its corresponding connecting roadway. Exemplary arrangement positions of each connecting opening include: the connecting opening of the second layered stope 32 refers to the connection port between the main stope connecting roadway 41 and the second layered stope 32, and this opening is located in the center of the second layered stope 32; the connecting opening of the first layered stope 31 refers to the connection port between the first layered stope connecting roadway 42 and the first layered stope 31, and this opening is located in the center-left position of the first layered stope 31; the connecting opening of the third layered stope 33 refers to the connection port between the third layered stope connecting roadway 43 and the third layered stope 33, and this opening is located in the center-right position of the third layered stope 33; the connecting opening of the fourth layered stope 34 refers to the connection port between the fourth layered stope connecting roadway 44 and the fourth layered stope 34, and this opening is located in the center-left position of the fourth layered stope 34.

[0038] Reference Figure 2 The diagram shows the opening projection. If the vertical plane perpendicular to the ore body strike is taken as the projection plane, the openings connecting adjacent layers do not overlap on this projection plane. For example, the opening projection of the first layer stope 31 is located to the left of the opening projection of the second layer stope 32, the opening projection of the third layer stope 33 is located to the right of the opening projection of the second layer stope 32, and the opening projection of the fourth layer stope 34 is located to the left of the opening projection of the third layer stope 33, forming a left-right staggered projection distribution. This avoids vertical projection overlap, thus dispersing the roadway voids into independent areas at different vertical heights. Stress cannot be concentrated and transmitted along the vertical direction, but is instead dispersed to a wider area of ​​surrounding rock. The load is shared by the cooperative bearing capacity of the surrounding rock itself, avoiding the problem of stress superposition leading to surrounding rock fracture.

[0039] In some implementations, refer to Figures 1 to 3The distance between the vertical projections of the connecting openings of adjacent layered mining areas along the ore body direction is L. The distance L ensures that the slope of the connecting passage between the connecting opening of the layered mining area and another connecting opening located on the inner wall of the main mining area connecting passage is not greater than a preset value.

[0040] Specifically, refer to Figure 2 , Figure 3 as well as Figure 8 , Figure 9 Taking the connecting roadway 41 between the second-level mining area 32 and the main mining area and the connecting roadway 43 between the third-level mining area 33 and the third-level mining area as examples, the slope of the connecting roadway is the vertical height difference H between the starting point and the ending point of the connecting roadway / the horizontal distance M between the starting point and the ending point of the connecting roadway along its own direction. Among these, L and B (the distance between the opening position of the third-level mining area connecting roadway 43 in the main mining area connecting roadway 41 and the boundary of the third-level mining area 33) affect the length of M. When B is determined, by controlling the minimum value of L, it is ensured that M is long enough to limit the slope within a preset value, which is usually seven percent to ten percent.

[0041] Based on this, preferably, L is taken to the minimum value so that the opening of the stratified stope connecting road above the corresponding stratified stope is as close as possible to the middle of the stope.

[0042] Preferably, when L is determined, the slope of the connecting roadway in the stratified mining area can also be reduced by increasing B.

[0043] In some implementations, refer to Figure 3 A turning space is provided at the interface between the layered mining area connecting road and the main mining area connecting road. The width of the turning space in the horizontal direction is greater than the width of the main mining area connecting road.

[0044] Specifically, the standard section width of the main mining area connecting roadway 41 is 3m. Near the interface between the main mining area connecting roadway 41 and the third-level mining area connecting roadway 43, the roadway width gradually changes from 3m to 4.5m to meet the turning radius requirements. When the front wheels of the loader enter the inclined connecting roadway 43, the rear wheels still have enough space to adjust their angle within the widened horizontal section to avoid scraping the inner wall of the roadway.

[0045] In some implementations, refer to Figure 3 and Figure 4 The turning spaces between the connecting tunnels of multiple layered mining areas do not overlap.

[0046] For example, the turning space of the first layered stope connecting road 42 is located on the left inner wall of the main stope connecting road 41, the turning space of the third layered connecting road 43 is located on the right inner wall of the main stope connecting road 41, and the turning space of the fourth layered stope connecting road 44 is located on the right inner wall of the third layered connecting road 43. This ensures that the three layered connecting roads do not overlap in the turning space between the main stope connecting roads, and the turning and avoidance of each layered equipment can be completed in an independent widened space, avoiding congestion caused by multiple equipment intersections and improving the parallelism of layered operations.

[0047] In some implementations, refer to Figure 3 and Figure 4 The interfaces of two adjacent channels are located on the inner walls of different sides of the main stope connecting roadway. For example, the left inner wall of the main stope connecting roadway 41 refers to the inner wall connected to the third-level stope connecting roadway 43. Correspondingly, the inner wall on the right side is the inner wall opposite to the left inner wall. Adjacent channel interfaces refer to the two interfaces being close to the boundary of the second-level stope 32. For example, the distance between the interface of the third-level stope connecting roadway 43 and the boundary of the second-level stope 32 is 25m, and the distance between the interface of the first-level stope connecting roadway 42 and the boundary of the second-level stope 32 is 30m. If the interfaces of the two-level stope connecting roads and the main stope connecting roadway 41 are located on the same side, the continuous excavation of multiple openings may form a stress concentration zone, which may easily induce spalling.

[0048] When set on different sides, the stresses on both sides do not interfere with each other, avoiding the superposition of stresses on the same side. The stress peak areas of the two sides are completely staggered in the vertical direction, avoiding the problem of surrounding rock fracturing caused by opening on the same side.

[0049] In some implementations, refer to Figure 1 and Figure 5 The cross-section of the layered stope is an inverted trapezoid. The inverted trapezoidal stope has a cross-section that is wider at the top and narrower at the bottom, which is suitable for the vertical pressure dispersion requirements of the hanging wall of the steeply dipping ore body. It can reduce the exposed area of ​​the surrounding rock, avoid stress concentration on the side walls, and reduce the risk of roof collapse and spalling.

[0050] In some implementations, refer to Figures 5 to 7 The upper sidewall of the inverted trapezoidal cross-section is equipped with densely arranged anchor bolts, including pipe-seam anchor bolts, or mortar anchor bolts and pipe-seam anchor bolts. For the first mining layer, pipe-seam anchor bolts 11 and mortar anchor bolts 13 are densely arranged; for other layers, pipe-seam anchor bolts 11 are densely arranged. Because the upper wall is subjected to stronger vertical pressure and shear force, the dense anchor bolts can enhance the integrity of the surrounding rock, resist concentrated stress, and prevent spalling.

[0051] In some implementations, refer to Figure 6 and Figure 7The anchor bolts in adjacent layered mining areas are arranged in a staggered manner. Specifically, the vertical projections of the anchor bolts in adjacent layers do not overlap and are distributed in a staggered manner to avoid the formation of continuous anchor bolt gaps, disperse the stress of the surrounding rock and the filling body, and prevent the surrounding rock from fracturing or the filling body from cracking due to stress concentration.

[0052] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in this application, and within the spirit and principles of this application, should be included within the scope of protection of this application.

[0053] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A downwardly inclined trapezoidal long access structure for steeply dipping thin veins, characterized in that, include: A multi-layered stope is provided, which is vertically stacked along a steeply dipping vein, and the multi-layered stopes form a segment. Isolation pillars are set between the original upward mining area and the current downward mining area; The intermediate transport roadway is set at the same horizontal level as the isolation pillar and extends along the strike of the ore body; The segmented transport roadway is located within the segment and is on the same horizontal plane as any of the stratified mining areas in that segment. The main mining area connecting roadway connects one end of the main mining area connecting roadway to the segmented transport roadway and the other end to the layered mining area, and the layered mining area and the segmented transport roadway are on the same horizontal plane. The stratified stope connecting road is connected at one end to the inner wall of the main stope connecting road, and at the other end to other stratified stopes in the same section.

2. The downward-inverted trapezoidal long access structure for a steeply inclined thin vein according to claim 1, characterized in that, The connection opening between the main stope connecting road and the corresponding stratified stope is located in the center of the stratified stope.

3. The downward-inverted trapezoidal long access structure for a steeply inclined thin vein according to claim 2, characterized in that, The vertical projections of the connecting openings of adjacent stratified mining areas do not overlap.

4. The downward-inverted trapezoidal long access structure for a steeply inclined thin vein according to claim 3, characterized in that, The distance between the vertical projections of the connecting openings of adjacent layered mining areas along the ore body direction is L. The distance L ensures that the slope of the connecting channel formed between the connecting opening of the layered mining area and another connecting opening located on the inner wall of the main mining area connecting channel is not greater than a preset value.

5. The downward-inverted trapezoidal long access structure for a steeply inclined thin vein according to claim 1, characterized in that, A turning space is provided at the channel interface of the layered mining area connecting roadway to the main mining area connecting roadway. The width of the turning space in the horizontal direction is greater than the width of the main mining area connecting roadway.

6. The downward-inverted trapezoidal long access structure for a steeply inclined thin vein according to claim 5, characterized in that, The turning spaces between the multiple stratified mining area connecting channels do not overlap.

7. The downward-inverted trapezoidal long access structure for a steeply inclined thin vein according to claim 5, characterized in that, The two adjacent channel interfaces are located on the inner walls of different sides of the main mining area connecting roadway.

8. The downward-inverted trapezoidal long access structure for a steeply inclined thin vein according to claim 1, characterized in that, The cross-section of the stratified mining area is an inverted trapezoid.

9. The downward-inverted trapezoidal long access structure for a steeply inclined thin vein according to claim 8, characterized in that, The upper sidewall of the inverted trapezoidal cross-section is provided with densely arranged anchor bolts, including slotted pipe anchor bolts. or, Mortar anchor bolts and pipe joint anchor bolts.

10. A downwardly inclined trapezoidal long access structure for a steeply inclined thin vein according to claim 9, characterized in that, The anchor bolts of adjacent stratified mining areas are arranged in an alternating pattern.

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