A mechanical mining method for the first mining layer of a broken ore body

Abstract

The present invention provides a mechanical mining method for the first mining layer of a broken ore body, and relates to the technical field of mining. The mechanical mining method for the first mining layer of a broken ore body provided by the present invention includes dividing a plurality of disk areas within the first mining layer, and the disk area includes an intra-vein connecting road, an intra-vein mining qualified approach, and a plurality of first recovery approaches. The intra-vein mining qualified approach and the first recovery approach are both arranged at an angle to the intra-vein connecting road, and the intra-vein mining qualified approach is arranged in parallel with the first recovery approach; the intra-vein connecting road and the intra-vein mining qualified approach are advanced pre-supported, and each first recovery approach is advanced pre-supported through the intra-vein connecting road and / or the intra-vein mining qualified approach, and mechanical recovery operations are carried out under the advanced pre-support, and filling is carried out after recovery is completed. The mechanical mining method for the first mining layer of a broken ore body provided by the present invention can solve the problem of mechanical continuous mining of the first mining layer of a broken ore body, and give play to the advantages of long-distance, continuous, and efficient mining of mechanical continuous mining.

Description

Technical Field

[0001] The invention relates to the technical field of mining, in particular to a mechanical mining method for the first mining layer of a broken ore body. Background Art

[0002] In underground mining projects, the mining of broken ore bodies has always been an industry problem. Once the broken ore bodies are exposed, collapse will occur, and there are great safety risks in the mining process.

[0003] In the existing technology, the drilling and blasting method is generally used to "short excavation and short support" to mine broken ore bodies. The mining efficiency is low, the support engineering workload is large, the overall cost is high, and safety risks still exist. Due to the disturbance caused by drilling and blasting excavation, adjacent working faces cannot be mined.

[0004] At present, some non-coal mines use mechanical mining in the mining of unstable and broken ore bodies. Mechanical mining is used instead of drilling and blasting. Mechanical mining has little disturbance to the surrounding rock, but considering the problem of the empty top distance of the surrounding rock, in order to prevent safety risks, high-intensity support must be carried out after 2-5m of excavation to ensure that the operators and machinery can work under the support as much as possible. Therefore, only by changing the ore dropping method, it is still impossible to change the current situation of the ore dropping and support operation cycle in the mining of broken ore bodies, and it is impossible to give full play to the advantages of long-distance, continuous and efficient mechanical mining. Summary of the invention

[0005] The purpose of the present invention is to provide a mechanical mining method for the first mining layer of a broken ore body, which can give full play to the advantages of mechanical long-distance, continuous and high-efficiency mining.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a mechanical mining method for the first mining layer of a broken ore body, comprising:

[0008] Divide a plurality of panels in the first mining layer, wherein the panel comprises an intra-vein connecting channel, an intra-vein mining access route and a plurality of first recovery access routes, wherein the intra-vein mining access route and the first recovery access route are arranged at an angle to the intra-vein connecting channel, and the intra-vein mining access route is arranged in parallel with the first recovery access route;

[0009] The intra-vein connecting channel and the intra-vein mining approach are pre-supported in advance, and each of the first mining approaches is pre-supported in advance through the intra-vein connecting channel and / or the intra-vein mining approach. Each of the first mining approaches performs mechanical mining operations under the pre-support, and backfilling is performed after the mining is completed.

[0010] Furthermore, at least one intra-vein communication channel and at least one intra-vein mining access route are arranged in the panel area;

[0011] When there are multiple intra-pulse sampling approaches, each of the intra-pulse sampling approaches is arranged parallel to or at an angle to each other.

[0012] Furthermore, the intra-vein connection channel and the intra-vein mining approach are provided with advanced pre-support, specifically including:

[0013] A first conduit is driven obliquely upward at the top of the intra-vein connecting channel and the intra-vein mining access, and grouting is injected into the first conduit, and a steel arch is erected in the intra-vein connecting channel and the intra-vein mining access.

[0014] Furthermore, the first conduit is 10-20 m long, and the first conduit is installed at an angle of 1-10° obliquely upward relative to a horizontal plane.

[0015] Further, the first mining approaches are pre-supported in advance through the intra-vein connecting channel and / or the intra-vein mining approach, specifically including:

[0016] In one or both sides of the intra-vein connecting channel and / or the intra-vein mining approach, a second conduit is drilled above the first mining approach on one side or both sides and grouting is injected into the second conduit, and the extension direction of the first mining approach forms an angle with the extension direction of the drilled second conduit.

[0017] Furthermore, the intra-vein connecting channel and the intra-vein mining approach are both three-center arch sections;

[0018] A group of the first conduits are set at a first distance along the extension direction of the tunnel in the intra-vein connecting channel and the intra-vein mining access route.

[0019] Furthermore, in any one of the intra-pulse communication channel and the intra-pulse sampling access route, the head ends and tail ends of two adjacent groups of the first conduits are overlapped up and down, and the steel arch frame is erected at the corresponding overlapping parts of the intra-pulse communication channel and the intra-pulse sampling access route.

[0020] Furthermore, a plurality of the steel arch frames are erected at the corresponding overlapping locations in the intra-vein connecting channel and the intra-vein mining access route, and the spacing between adjacent steel arch frames is 0.5-5m.

[0021] Furthermore, the first mining access route is a rectangular cross-section, and the three-center arch section of the intra-vein connecting channel and the intra-vein mining access route includes a straight wall section and an arch section connected to the straight wall section, and the height of the straight wall section is higher than the height of the first mining access route.

[0022] Furthermore, the second conduit is 10-100 m long, and the second conduit is set at an upward angle of 0-3° relative to a horizontal plane.

[0023] The mechanical mining method for the first mining layer of a broken ore body provided by the present invention can produce the following beneficial effects:

[0024] Compared with the prior art, the mechanical mining method for the first mining layer of a broken ore body provided by the present invention first performs advance pre-support on the intra-vein connecting roads and the intra-vein mining approaches, and then simultaneously performs advance pre-support on each first mining approach through the intra-vein connecting roads and / or the intra-vein mining approaches, so as to set up a large-scale advance pre-support system above the extremely broken ore body in the first mining layer. Mechanical mining is carried out under the advance pre-support system, which can give full play to the advantages of long-distance, continuous and high-efficiency mining by machinery, greatly ensures the efficiency and safety of mechanical mining, ensures the smooth and efficient mining of the broken ore body, and alleviates the technical problems of low mining efficiency and proneness to accidents in the prior art of broken ore bodies. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A side view of an ore body when a mechanical mining method for the first mining layer of a broken ore body provided by an embodiment of the present invention is applied;

[0027] Figure 2 A top view of an ore body when the mechanical mining method for the first mining layer of a broken ore body provided by an embodiment of the present invention is applied;

[0028] Figure 3 for Figure 2 AA cross-section diagram;

[0029] Figure 4 A top view of another ore body when the mechanical mining method for the first mining layer of a broken ore body provided by an embodiment of the present invention is applied;

[0030] Figure 5 A cross-sectional view of an in-pulse mining approach when applying the mechanical mining method for the first mining layer of a broken ore body provided by an embodiment of the present invention;

[0031] Figure 6 A cross-sectional view of the in-pulse mining approach when the mechanical mining method for the first mining layer of a broken ore body provided by an embodiment of the present invention is applied;

[0032] Figure 7 A cross-sectional view of the first mining approach when the mechanical mining method for the first mining layer of a broken ore body provided by an embodiment of the present invention is applied;

[0033] Figure 8A cross-sectional view of the first mining approach when the mechanical mining method for the first mining layer of a broken ore body provided in an embodiment of the present invention is applied.

[0034] Icons: 1-first mining layer; 2-panel area; 3-intra-vein connecting channel; 4-intra-vein mining approach; 5-first recovery approach; 6-first guide tube; 7-steel arch; 8-second guide tube; 9-second recovery approach. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0039] This embodiment provides a method for mechanical mining of the first mining layer of a broken ore body. Figures 1 to 3 As shown, including:

[0040] A plurality of panel areas 2 are divided in the first mining layer 1, and the panel area 2 includes an intra-vein connecting channel 3, an intra-vein mining access 4 and a plurality of first recovery access 5. The intra-vein mining access 4 and the first recovery access 5 are arranged at an angle to the intra-vein connecting channel 3, and the intra-vein mining access 4 and the first recovery access 5 are arranged in parallel;

[0041] The intra-vein connecting channel 3 and the intra-vein mining access 4 are pre-supported in advance, and each first mining access 5 is pre-supported in advance through the intra-vein connecting channel 3 and / or the intra-vein mining access 4. Each first mining access 5 performs mechanical mining operations under the pre-support, and backfilling is performed after the mining is completed.

[0042] When implementing the above-mentioned mechanical mining method for the first mining layer of the broken ore body, a plurality of panels 2 are first divided within the first mining layer 1, and the panel 2 includes an intra-vein connecting channel 3, an intra-vein mining permit approach 4 and a plurality of first mining approaches 5. Then, personnel can perform advance pre-support on the intra-vein connecting channel 3 and the intra-vein mining permit approach 4. Since the intra-vein mining permit approach 4 is arranged in parallel with the first mining approach 5, and the first mining approach 5 is arranged at an angle to the intra-vein connecting channel 3, personnel can perform advance pre-support from the side of the intra-vein mining permit approach 4 to each first mining approach 5, or perform advance pre-support from the side of the intra-vein connecting channel 3 to each first mining approach 5. Finally, each first mining approach 5 performs mechanical mining under the advance pre-support, and backfilling is performed after the mining is completed.

[0043] The above-mentioned embodiment realizes the construction of a large-scale advanced pre-support system above the extremely broken ore body in the first mining layer. Mechanical mining is carried out under the advanced pre-support system, which can give full play to the advantages of long-distance, continuous and high-efficiency mechanical mining, greatly ensure the efficiency and safety of mechanical mining, ensure the smooth and efficient mining of the broken ore body, and alleviate the technical problems of low efficiency and proneness to accidents in the existing technology of broken ore mining.

[0044] In an optional embodiment, if Figure 3 and Figure 4 As shown, at least one intra-vein connecting channel 3 and at least one intra-vein mining access 4 are arranged in the panel area 2; when there are multiple intra-vein mining accesses 4, the intra-vein mining accesses 4 are arranged parallel to or at an angle to each other.

[0045] According to the specifications of the panel area, one, two, three or even more intra-vein connecting roads 3 can be arranged in the panel area 2. The intra-vein connecting roads 3 can be arranged parallel to each other or at an angle. The mining machinery can enter the first recovery routes 5 or the intra-vein mining routes 4 from the intra-vein connecting roads 3.

[0046] Similarly, according to the specifications of the panel area, one, two, three or even more vein sampling routes 4 can be arranged in the panel area 2, such as Figure 2 As shown, a pulse sampling approach 4 is arranged, such as Figure 4 As shown, two intra-vein sampling approaches 4 are arranged, and the two intra-vein sampling approaches 4 are arranged at an angle.

[0047] use Figure 2When the arrangement method shown is used, when the side walls of the intra-vein mining access 4 are used to pre-support each first mining access 5 in a direction perpendicular to the extension direction of each first mining access 5, some first mining accesses 5 cannot be covered. Therefore, it is necessary to pre-support the first mining access 5 in a direction perpendicular to the extension direction of the first mining access 5 on the side walls of the intra-vein connecting road 3, so as to ensure that the mechanical mining operation can be carried out after the pre-support of each first mining access 5 is in place.

[0048] use Figure 4 The same is true for the arrangement method shown. The advance pre-support that cannot be arranged through the intra-vein mining approach 4 to the first mining approach 5 can be arranged through the intra-vein connecting road 3 to the first mining approach 5. Figure 4 and Figure 2 The difference is that when the two intra-vein mining approaches 4 are arranged at an angle, two triangular mining areas are formed between the first mining approach 5 and the boundary of the disk area. The mining areas are not directly connected to the intra-vein connecting roads 3, and mechanical mining equipment cannot directly enter the mining areas from the intra-vein connecting roads 3. Therefore, each mining area includes multiple second mining approaches 9. The multiple second mining approaches 9 in each mining area are arranged in parallel. One end of each second mining approach 9 is connected to the first mining approach 5 adjacent to the mining area. During mining, mechanical mining equipment can enter each second mining approach 9 in turn from the above-mentioned first mining approach 5 for mining. It is worth mentioning that when the intra-vein mining approach 4 and the side walls of the intra-vein connecting roads 3 are used to advance and pre-support each first mining approach 5 in a direction perpendicular to the extension direction of each first mining approach 5, each second mining approach 9 can be advanced and pre-supported at the same time.

[0049] In an optional embodiment, if Figure 5 As shown, advance pre-support is carried out on the intra-vein connecting channel 3 and the intra-vein mining approach 4, specifically including: driving a first guide tube 6 obliquely upward at the top of the intra-vein connecting channel 3 and the intra-vein mining approach 4 and injecting grout into the first guide tube 6, and erecting a steel arch frame in the intra-vein connecting channel 3 and the intra-vein mining approach 4.

[0050] In the above embodiment, the first conduit 6 is driven obliquely upward at the top of the intra-vein connecting channel 3 and the intra-vein mining access 4, and after grouting is injected into the first conduit 6, a stable support structure can be formed at the top of the intra-vein connecting channel 3 and the intra-vein mining access 4. Affected by the driving angle, the length of the first conduit 6 cannot be too long, so it is necessary to drive multiple groups of first conduits 6 along the extension direction of the intra-vein connecting channel 3 and the intra-vein mining access 4. A steel arch frame 7 is set up at the head end of the first group of first conduits 6, the tail end of the last group of first conduits 6, and between two adjacent groups of first conduits 6 along the extension direction of the intra-vein connecting channel 3. A steel arch frame 7 is set up at the head end of the first group of first conduits 6, the tail end of the last group of first conduits 6, and between two adjacent groups of first conduits 6 along the extension direction of the intra-vein mining access 4. The steel arch frame 7 plays a role in supporting the first conduits 6, ensuring that the roof structure is more stable during the mining process.

[0051] In an optional embodiment, the first conduit 6 is 10-20m long, specifically 10m, 12m, 15m, 18m or 20m long, and the first conduit 6 is set at an upward angle of 1-10° relative to the horizontal plane, specifically 1°, 2°, 5°, 8° or 10°.

[0052] In an optional embodiment, if Figure 5 and Figure 6 As shown, the intra-vein connecting channel 3 and the intra-vein mining access route 4 are both three-center arch sections; a group of first conduits 6 are driven at intervals of a first distance L1 in the intra-vein connecting channel 3 along the extension direction of the tunnel, and each first conduit 6 in each group of first conduits 6 is driven at intervals along the arch top of the intra-vein connecting channel 3; a group of first conduits 6 are driven at intervals of a first distance L1 in the extension direction of the tunnel in the intra-vein mining access route 4, and each first conduit 6 in each group of first conduits 6 is driven at intervals along the arch top of the intra-vein mining access route 4.

[0053] In the above embodiment, since each first conduit 6 is laid at intervals along the arch of the intra-pulse connecting channel 3 and the intra-pulse sampling access 4, a stable support structure can be formed on the top of the intra-pulse connecting channel 3 and the intra-pulse sampling access 4. In addition, since a group of first conduits 6 is laid at every first distance L1 in the intra-pulse connecting channel 3 and the intra-pulse sampling access 4, it can be ensured that the intra-pulse connecting channel 3 and the intra-pulse sampling access 4 have stable support structures evenly arranged along their respective extension directions.

[0054] The first distance is related to the length of the first conduit 6 . The longer the length of the first conduit 6 is, the greater the first distance is, and the shorter the length of the first conduit 6 is, the smaller the first distance is.

[0055] In addition, if Figure 6As shown, the lower edge of the head end of the first group of first conduits 6 is 10-50 cm away from the edge of the tunnel arch, specifically 10 cm, 20 cm, 30 cm, 40 cm or 50 cm, and the spacing between adjacent edges of two adjacent first conduits 6 in the same group is 10-200 cm, specifically 10 cm, 20 cm, 50 cm, 100 cm, 150 cm or 200 cm.

[0056] The above arrangement can avoid the first conduits 6 in each group of first conduits 6 being too dense or too sparse, thereby saving costs and ensuring the advanced pre-support strength of the intra-vein connecting channel 3 and the intra-vein mining approach 4.

[0057] In an optional embodiment, if Figure 5 As shown, in any one of the intra-pulse communication channel 3 and the intra-pulse sampling access 4, the head ends and tail ends of two adjacent groups of first conduits 6 are overlapped up and down, and steel arch frames 7 are erected at the corresponding overlapping parts of the intra-pulse communication channel 3 and the intra-pulse sampling access 4.

[0058] It can be understood that the end of the first conduit 6 with a lower height is the head end, and the end of the first conduit 6 with a higher height is the tail end.

[0059] Taking the intra-vein mining approach 4 as an example, in two adjacent groups of first conduits 6, the tail end of the previous group of first conduits 6 and the head end of the latter group of first conduits 6 are arranged to overlap each other up and down, so that the support structure formed by the two adjacent groups of first conduits 6 is crossed, avoiding the phenomenon that the tail end of the first conduit 6 is too far away from the edge of the arch and the support is not in place. At the same time, since a steel arch frame 7 is erected at the corresponding overlapping position in the intra-vein connecting channel 3 and a steel arch frame 7 is erected at the corresponding overlapping position in the intra-vein mining approach 4, the steel arch frame 7 can further support the connection between the two support structures, thereby ensuring that a stable advanced pre-support structure is formed on the top of the intra-vein mining approach 4.

[0060] In an optional embodiment, a plurality of steel arch frames are erected at corresponding overlapping locations in the intra-vein connecting channel 3 and the intra-vein mining access route 4, and the spacing between adjacent steel arch frames 7 is 0.5-5m.

[0061] The steel arch frame 7 can be manufactured in advance according to the cross-section of the excavated tunnel. 2-10 steel arch frames 7 can be erected at the corresponding overlapping parts in the intra-vein connecting road 3, and 2-10 steel arch frames 7 can be erected at the corresponding overlapping parts in the intra-vein mining approach 4. The spacing between adjacent steel arch frames 7 can be 0.5 m, 1m, 2m, 3m, 4m or 5m.

[0062] In an optional embodiment, each first recovery route 5 is simultaneously advanced pre-supported through the intra-vein communication channel 3 and / or the intra-vein mining access 4, specifically including: one or two sides of the intra-vein communication channel 3 and / or the intra-vein mining access 4, such as Figure 7As shown, a second conduit 8 is drilled above the first mining access 5 on one side or both sides and grouting is injected into the second conduit 8. The extension direction of the first mining access 5 forms an angle with the extension direction of the drilled second conduit 8. Then, the first mining layer 1 is crushed and mined by machinery.

[0063] In the above-mentioned embodiment, each first recovery route 5 can be simultaneously pre-supported directly through the intra-vein connecting channel 3 and / or the intra-vein mining route 4, getting rid of the traditional "short excavation and short support" drilling and blasting mining method, and instead adopting large-scale pre-support, and carrying out mechanical mining under the pre-support system, which can effectively give play to the advantages of long-distance, continuous and high-efficiency mechanical mining.

[0064] When the two intra-vein mining approaches 4 are arranged at an angle, the second guide tube 8 can be directly extended to the second recovery mining approach 9. The second guide tube 8 can simultaneously perform advance pre-support on the first recovery mining approach 5 and the second recovery mining approach 9, thereby simplifying the support steps.

[0065] The extension direction of the first recovery access road 5 and the extension direction of the second guide tube 8 may form an angle of 90°-150°, specifically 90°, 100°, 120° or 150°.

[0066] Preferably, the extension direction of the first recovery access road 5 and the extension direction of the second guide tube 8 are at an angle of 90°.

[0067] In an optional embodiment, if Figure 6 and Figure 8 As shown, the first mining access 5 is a rectangular cross-section, and the three-center arch section of the intra-vein connecting channel 3 and the intra-vein mining access 4 includes a straight wall section and an arch section connected to the straight wall section. The height L2 of the straight wall section is higher than the height L3 of the first mining access 5.

[0068] In the above embodiment, since the height L2 of the straight wall section is higher than the height L3 of the first mining access road 5, personnel can install the second conduit 8 from the side wall of the part of the straight wall section that is higher than the first mining access road 5 to the first mining access road 5 on both sides, so as to facilitate personnel to lay the second conduit 8 above the first mining access road 5.

[0069] When laying, two adjacent second conduits 8 can be arranged parallel to each other and spaced 10-200 cm apart, specifically 10 cm, 20 cm, 50 cm, 100 cm, 150 cm or 200 cm apart. After the second conduits 8 are laid, they can cover all the first recovery access roads 5 or the second recovery access roads 9. The second conduits 8 that cannot be laid on the side of the intra-vein recovery access road 4 can be laid on the side of the intra-vein communication road 3.

[0070] In an optional embodiment, the second conduit 8 is 10-100m long, specifically 10m, 20m, 50m, 80m or 100m long, and the second conduit 8 is set at an angle of 0-3° relative to the horizontal plane, specifically 1°, 1.5°, 2°, 2.5° or 3°.

[0071] In an optional embodiment, the first conduit 6 and the second conduit 8 are made of steel or fiberglass steel, with a diameter of 80-120 mm and a wall thickness of 3-8 mm.

[0072] A plurality of grouting holes are provided on the first conduit 6 and the second conduit 8 .

[0073] In addition, the grouting material can be pure cement slurry or cement-water glass double liquid slurry or new type of cementitious material slurry.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A mechanical mining method for the first mining layer of a broken ore body, characterized in that: include: A plurality of panel areas (2) are divided in the first mining layer (1), wherein the panel area (2) comprises an intra-vein connecting channel (3), an intra-vein mining access route (4) and a plurality of first recovery access routes (5), wherein the intra-vein mining access route (4) and the first recovery access routes (5) are arranged at an angle to the intra-vein connecting channel (3), and the intra-vein mining access route (4) and the first recovery access routes (5) are arranged in parallel; The intra-vein connecting channel (3) and the intra-vein mining access (4) are provided with advanced pre-support, and each of the first mining accesses (5) is provided with advanced pre-support through the intra-vein connecting channel (3) and / or the intra-vein mining access (4), and each of the first mining accesses (5) performs mechanical mining under the advanced pre-support, and performs backfilling after mining is completed; The intra-vein connection channel (3) and the intra-vein mining approach (4) are provided with advanced pre-support, specifically comprising: A first conduit (6) is installed obliquely upwards at the top of the intra-vein connecting channel (3) and the intra-vein mining access (4), grouting is injected into the first conduit (6), and a steel arch frame (7) is installed in the intra-vein connecting channel (3) and the intra-vein mining access (4); The method of performing advance pre-support on each of the first mining approaches (5) through the intra-vein connecting channel (3) and / or the intra-vein mining approach (4) specifically comprises: In one or both sides of the intra-vein connecting channel (3) and / or the intra-vein mining access (4), a second conduit (8) is drilled above the first recovery access (5) on one side or both sides and grout is injected into the second conduit (8), and the extension direction of the first recovery access (5) forms an angle with the extension direction of the drilled second conduit (8).

2. The mechanical mining method for the first mining layer of a broken ore body according to claim 1 is characterized in that: At least one intra-vein connecting channel (3) and at least one intra-vein mining access route (4) are arranged in the panel area (2); When the intra-pulse sampling paths (4) are configured as a plurality of paths, the intra-pulse sampling paths (4) are arranged parallel to each other or at an angle.

3. The mechanical mining method for the first mining layer of a broken ore body according to claim 1 is characterized in that: The first conduit (6) is 10-20 m long, and the first conduit (6) is installed at an angle of 1-10° upward relative to the horizontal plane.

4. The mechanical mining method for the first mining layer of a broken ore body according to claim 1 is characterized in that: The intra-vein connection channel (3) and the intra-vein mining approach (4) are both three-center arch sections; A group of the first guide tubes (6) are set at a first distance in the intra-vein connecting channel (3) and the intra-vein mining access route (4) along the extension direction of the tunnel.

5. The mechanical mining method for the first mining layer of a broken ore body according to claim 4 is characterized in that: In any one of the intra-pulse communication channel (3) and the intra-pulse sampling access route (4), the head ends and tail ends of two adjacent groups of the first conduits (6) are overlapped up and down, and the steel arch frame (7) is erected at the corresponding overlapping positions in the intra-pulse communication channel (3) and the intra-pulse sampling access route (4).

6. The mechanical mining method for the first mining layer of a broken ore body according to claim 5 is characterized in that: A plurality of the steel arch frames (7) are erected at the corresponding overlapping locations in the intra-vein connecting channel (3) and the intra-vein mining access route (4), and the spacing between adjacent steel arch frames (7) is 0.5-5 m.

7. The mechanical mining method for the first mining layer of a broken ore body according to claim 4 is characterized in that: The first mining access road (5) has a rectangular cross-section, and the three-center arch cross-section of the intra-vein connecting road (3) and the intra-vein mining access road (4) includes a straight wall section and an arch section connected to the straight wall section, and the height of the straight wall section is higher than the height of the first mining access road (5).

8. The mechanical mining method for the first mining layer of a broken ore body according to claim 1 is characterized in that: The second conduit (8) is 10-100 m long, and the second conduit (8) is installed at an angle of 0-3° relative to the horizontal plane.

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