Upward fan-shaped medium-deep hole stage filling mining method for steeply inclined broken ore bodies

Abstract

The present invention provides a method for mining steeply inclined crushed ore bodies with upward fan-shaped medium-deep hole stage filling, which belongs to the technical field of metal mining. The method sets up an artificial false bottom at the bottom of the stope, and uses shallow holes on the artificial false bottom to carry out mining in an inclined direction toward the upper plate. The bottom triangular pillars of traditional fan-shaped medium-deep hole mining are mined, and cemented and filled. In combination with a rock drilling tunnel excavated near the lower plate, an artificial ore-receiving trench is formed. During each stage of mining, long anchor cables are grouting constructed in the rock drilling tunnel to reinforce the upper plate. During mining blasting, the stope roof gradually lowers from the upper plate to the lower plate, forming an inclined roof. The collapsed ore body is mined through staged mining and veining, and tailings are cemented and filled. The method of the present invention is simple to construct, has low labor intensity for workers, good operational safety, and low loss and depletion in the stope. It achieves safe and efficient mining of steeply inclined crushed ore bodies, providing a guarantee for the safe development of mining enterprises.

Description

Technical Field

[0001] The invention belongs to the technical field of metal mining, and in particular relates to a method for mining a steeply inclined broken ore body with upward fan-shaped medium-deep hole stage filling. Background Art

[0002] For the mining of steeply inclined medium-thick ore bodies with poor upper wall surrounding rock stability, the main mining methods are open-site method and caving method due to the influence of the stability of the ore body and the surrounding rock. At present, the mining method for broken steeply inclined medium-thick ore bodies mainly adopts the bottom-pillarless segmented caving method. Mining starts from the top segment and proceeds downward step by step. During the mining process, an overburden layer is formed on the upper part of the stope. Mining is carried out under the overburden layer by extrusion blasting. After each blasting, ore is discharged under the overburden layer, and ore discharge is stopped after the cut-off grade is reached. Because this method blasts and discharges ore under the overburden layer, waste rock is easily mixed into the ore during the recovery process, resulting in a high ore depletion rate. At the same time, it is limited by the cut-off grade of ore discharge, and the loss rate of the stope is relatively high. The patent with publication number CN104727820A discloses a two-step segmented open-pit followed by filling mining method, which divides the ore block into pillars and ore rooms, first recovers the pillars and fills them with high-strength filling bodies, and recovers the ore rooms by segmented open-pit method, with mining carried out synchronously from the upper middle section to the lower middle section, with the upper middle section ahead of the lower middle section, and part of the collapsed ore remains in the empty area, and subsequent blasting is carried out by extrusion blasting, with the loose ore supporting the upper wall of the mining area. However, this method is mainly suitable for ore bodies with good stability of the upper wall surrounding rock. When the stability of the upper wall surrounding rock is poor, the upper wall surrounding rock is very likely to collapse each time the mine is mined, resulting in depletion of the ore. The patent with publication number CN111550248A discloses a pre-roof protection segmented empty field and subsequent filling mining method. This method divides the middle section of each mining field into 3-4 sections from top to bottom, and divides it into multiple strips along the vertical ore body direction to form an inclined mine room. Each section must be top-cut in advance, and fan-shaped medium-deep holes must be drilled in the mining field, and some of the medium-deep holes must pass through the upper wall. The holes entering the wall area are grouting, and the upper wall surrounding rock is reinforced with cement slurry. After blasting, a remote-controlled scraper is used to enter the empty area for mining. This method requires cutting the top in advance and supporting the top plate. It has a high support volume and high labor intensity. Grouting reinforcement of the drill holes in the upper wall surrounding rock is not only difficult but also has an unsatisfactory reinforcement effect, which can easily lead to collapse of the upper wall surrounding rock, posing a certain safety hazard to the remote-controlled scraper in the mining field. The mining efficiency of the remote-controlled scraper is low when operating in the empty area. Patent publication number CN112177613A discloses a fan-shaped medium-diameter deep hole mining process for steeply inclined medium-thick ore bodies. This method uses upper and lower middle section tunnels for mining construction, drills upward fan-shaped medium-deep holes in the rock drilling tunnel of the middle section, and simultaneously drills downward fan-shaped deep holes in the upper middle section mining level tunnel. By carrying out lateral blasting simultaneously above and below, the ore in the stope collapses and the ore is discharged through the lower loading level tunnel. This method has a small mining workload and high construction efficiency, but this method is suitable for ore bodies with good upper wall surrounding rock stability. For stopes with poor upper wall surrounding rock stability, the upper wall is very likely to collapse during mining blasting, resulting in ore depletion.

[0003] In view of this, it is necessary to design an improved upward fan-shaped medium-deep hole stage filling mining method for steeply inclined broken ore bodies to solve the above problems. Summary of the Invention

[0004] In view of the defects of the above-mentioned prior art, the purpose of the present invention is to provide a method for staged filling mining of upward fan-shaped medium-deep holes on steeply inclined broken ore bodies, by setting up an artificial false bottom at the bottom of the stope, and using shallow holes on the artificial false bottom to carry out mining in an inclined direction toward the upper plate, the bottom triangular pillars of traditional fan-shaped medium-deep hole mining are mined, and cemented and filled, and an artificial ore-receiving trench is formed in combination with a rock drilling tunnel excavated near the lower plate. When mining is carried out in each stage, long grouting anchor cables are constructed in the rock drilling tunnel to reinforce the upper plate. During mining blasting, the top of the stope gradually lowers from the upper plate to the lower plate to form an inclined roof. The collapsed ore body is mined through the vein in stages and is cemented and filled with tailings to solve the technical problems of unstable ore body in the upper plate and large safety hazards of remote-controlled scraper mining in the empty area. By this method, steeply inclined broken ore bodies can be mined safely, efficiently and economically.

[0005] To achieve the above-mentioned object, the present invention provides a method for mining steeply inclined broken ore bodies by upward fan-shaped medium-deep hole stage filling, comprising the following steps:

[0006] S1. Dividing the stope to be mined into a first-step stope and a second-step stope, and dividing the stope into several stages along the vertical direction; when mining the stope, first mining the first-step stope, mining and filling the first-step stope, and then mining the second-step stope;

[0007] S2. Excavate a ramp in the footwall of the stope to be mined, and excavate connecting roads from the ramp at every stage height toward the ore body to serve as access to and from the stope; excavate off-vein haulage lanes at every stage height along the strike of the ore body, with the off-vein haulage lanes communicating with the connecting roads at the corresponding stages;

[0008] S3. Excavate a bottom tunnel at the lowest stage of the stope and carry out bottom pulling work in the bottom tunnel to pull the ore body apart completely. Then, use tailings cementation filling to lay an artificial false bottom in the bottom pulling space.

[0009] S4. Mining the ore body in the triangular pillar area near the hanging wall on the artificial false bottom using a shallow hole method to form an inclined roof, and cementing and filling the artificial triangular pillar space formed after mining with tailings to form an artificial ore-receiving triangular pillar;

[0010] S5. Excavate a vein-along laneway at the junction of the artificial ore-receiving triangular pillar and the footwall of the ore body along the strike of the ore body, and excavate a vein-along laneway perpendicular to the ore body in the lowest-stage off-vein transport laneway, and the vein-along laneway is connected to the vein-along laneway.

[0011] S6. During the above stage, long grouting anchor cables are constructed along the vein tunnel toward the upper wall of the ore body to reinforce the surrounding rock of the upper wall of the ore body in advance;

[0012] S7. Drilling fan-shaped medium-long holes upward in the roadway along the vein at the stage using a medium-long hole drill, wherein the blastholes in the stope roof near the hanging wall are longer than the blastholes near the footwall, so that the top of the stope forms an inclined surface; charging the fan-shaped medium-long holes in the roadway along the vein at the stage, and detonating each hole one by one using a micro-difference detonation method, thereby forming an inclined stope roof;

[0013] S8. The ore that has collapsed in the stope is shoveled and loaded into the ore chute and transported out of the stope by a scraper through the vein in the above-mentioned stages;

[0014] S9. After all the ore in the stope is exhausted, a filling retaining wall is erected in the stage ore-extraction vein, and a filling borehole is constructed in the outer-vein transport tunnel, which is one stage away from the current stage, to the highest point of the stope void. A filling pipeline is passed through the filling borehole into the goaf, and the entire goaf is cemented with tailings through the filling pipeline to form a tailings cemented filling body. The filling body forms an inclined surface at the top, which serves as the artificial ore-receiving triangular pillar of the previous stage.

[0015] S10. In the ore body, along the artificial ore-bearing triangle formed by S9 and the boundary line of the ore body footwall, the vein tunnel is excavated, and mining and filling are carried out stage by stage from bottom to top according to the procedures of S5 to S9 until all the mining of the first-step mining area is completed; then mining and filling are carried out on the second-step mining area according to the same procedures until all the ore bodies in the mining area are mined.

[0016] As a further improvement of the present invention, in step S1, the lengths of the first-step mining area and the second-step mining area are 25 to 30 meters; and the stage heights are 12 to 15 meters.

[0017] As a further improvement of the present invention, in step S3, the height of the bottom pulling project is 2.5m; the thickness of the artificial false bottom is 1m, and the strength is not less than 5MPa.

[0018] As a further improvement of the present invention, in step S4, the inclination angle of the top plate of the artificial ore-receiving triangular prism is not less than 45°, that is, the inclination angle of the inclined surface of the artificial ore-receiving triangular prism formed after filling is not less than 45°.

[0019] As a further improvement of the present invention, in step S5, the specifications of the stage ore-exiting vein are 2.4m×2.4m, wherein the stage ore-exiting vein of the lowest stage is obliquely intersected with the stage vein-side tunnel of that stage, and the stage ore-exiting veins of the remaining stages are horizontally intersected with the stage vein-side tunnel of their respective stages; the specifications of the stage vein-side tunnel are 2.5m×2.5m.

[0020] As a further improvement of the present invention, in step S6, the row spacing of the grouting long anchor cables is 2.5m, with 3 to 4 anchor cables in each row, the length of each grouting long anchor cable is 15 to 20m, and the spacing between each grouting long anchor cable and the surrounding rock interface of the upper plate is 2.5 to 3m.

[0021] As a further improvement of the present invention, in step S7, the number of the fan-shaped medium and deep holes is determined according to the actual occurrence state of the ore body, the blast hole row spacing is 1.2 to 1.4 m, the hole bottom distance is 1.4 to 1.6 m, and each row of blast holes is micro-difference detonated hole by hole from the middle blast hole to both ends, and the micro-difference interval time is 50 ms. In order to ensure that the eyebrow line is not destroyed, the length of the hole mouth reserved for uncharged is determined according to the hole bottom distance parameter, and the overall hole mouth is staggered and spaced.

[0022] As a further improvement of the present invention, in step S7, the inclined stope roof formed after the sector-shaped medium- and long-hole blasting in each stage has an inclination angle of not less than 45°.

[0023] As a further improvement of the present invention, the upward fan-shaped medium-deep hole stage filling mining method for steeply inclined broken ore bodies is mainly suitable for steeply inclined ore bodies with relatively broken surrounding rocks on the upper plate, an ore body inclination greater than 55°, and a thickness greater than 4 to 15 meters.

[0024] The beneficial effects of the present invention are as follows: the upward fan-shaped medium-deep hole stage filling mining method for steeply inclined broken ore bodies provided by the present invention adopts upward fan-shaped medium-deep holes for mining blasting, and adopts a scraper to mine in the stage mining vein, and the equipment does not need to enter the empty area to operate, which significantly improves the mining efficiency and the safety of the mining operation in the mining field; the grouting long anchor cable is used to advance reinforce the surrounding rock of the ore body, and by injecting cement slurry into the cracks of the surrounding rock under high pressure, combined with the suspension effect of the long anchor cable, the stability of the surrounding rock of the mining field can be effectively improved, the collapse of the surrounding rock of the upper wall after mining can be avoided, and the loss and depletion of ore can be reduced; in An artificial false bottom is laid in the lowest stage of the mining area, which avoids the reservation of top pillars when mining in the lower middle section of the mining area and reduces the loss rate of ore. At the same time, the artificial false bottom can effectively separate the upper and lower middle sections of the mining area, preventing the depletion of ore due to the damage to the upper filling body when mining in the lower mining area. When mining in the mining area, shallow holes are first used to mine and fill the triangular pillar area close to the upper plate to form artificial ore-receiving triangular pillars, ensuring that personnel do not enter the empty area to operate when drilling and mining, thereby ensuring the safety of the operation. At the same time, the upper plate triangular pillars are recovered in advance to avoid the loss of this part of the ore due to the influence of the natural repose angle of the ore. During each stage of mining, the shape of the mine roof is controlled by the length of the blasthole. The inclined mine roof is formed at one time through blasting, and the upper plate ore-bearing triangular pillar is directly formed after the goaf is filled. This ensures that during the previous stage of mining, rock drilling and blasting are carried out directly in the stage-by-stage vein tunnels, avoiding the need for premature roof cutting operations, which can greatly reduce the labor intensity of the mine and improve the efficiency of mine mining. During the mining operation, personnel and equipment are mainly in the tunnel, reducing the safety risks of mine operations. This technical solution is simple to construct, has low labor intensity for workers, and good operational safety. Through the above technical solution, the safe, efficient, and economical mining of steeply inclined broken ore bodies was finally achieved, providing a guarantee for the long-term development of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a front view of the upward fan-shaped medium-deep hole stage filling mining method for a steeply inclined broken ore body in an embodiment of the present invention.

[0026] Figure 2 for Figure 1 Middle II-II cross-section.

[0027] Figure 3 for Figure 1 Middle III-III cross-section.

[0028] Figure 4 for Figure 1 Middle IV-IV cross-section.

[0029] Among them: 1-first-step mining site; 2-second-step mining site; 3-stage ore-exiting through vein; 4-out-of-vein transport tunnel; 5-stage along-vein tunnel; 6-filling drilling; 7-artificial false bottom; 8-artificial ore-receiving triangular pillar; 9-grouting long anchor cable; 10-tailings cemented filling body; 11-fan-shaped medium-deep hole; 12-ore chute; 13-ramp; 14-connecting road; 15-filling retaining wall. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] It should also be noted here that, in order to avoid obscuring the present invention due to unnecessary details, only structures and / or processing steps closely related to the solutions of the present invention are shown in the drawings, while other details that are not closely related to the present invention are omitted.

[0032] In addition, it should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus.

[0033] See also Figures 1 to 4 As shown, an embodiment of the present invention provides a method for filling mining of medium-deep holes in a fan-shaped manner for a steeply inclined broken ore body. This method is mainly suitable for steeply inclined ore bodies with relatively broken surrounding rocks on the upper plate, an ore body inclination greater than 55°, and a thickness greater than 4 to 15 meters. The overall mining sequence of the stope is to first mine the first-step stope 1 and then the second-step stope 2. The mining sequence of each stage of each stope is from bottom to top. In each stage, stope mining blasting is first performed, followed by mining, and finally the goaf is filled. Mining is carried out stage by stage in sequence until the mining of the entire stope is completed. Specifically, the following steps are included:

[0034] S1, dividing the stope to be mined into a first-step mining stope 1 and a second-step mining stope 2, and dividing the stope into several stages along the vertical direction;

[0035] Specifically, the length of the one-step mining site 1 and the two-step mining site 2 is 25 to 30 meters; the stage height is 12 to 15 meters;

[0036] S2. Excavate a ramp 13 in the footwall of the stope to be mined, and excavate connecting roads 14 from the ramp 13 at every stage height toward the ore body to serve as access to and from the stope; excavate an off-vein haulage tunnel 4 at every stage height along the strike of the ore body, with the off-vein haulage tunnel 4 communicating with the connecting roads 14 at the corresponding stage;

[0037] S3. Excavate a bottom tunnel (length * width = 2.5m * 2.5m) at the lowest stage of the stope, and carry out bottom pulling engineering in the bottom tunnel to pull the ore body apart completely. Then, use tailings cementation filling method to lay an artificial false bottom 7 in the bottom pulling space.

[0038] Specifically, the height of the bottom pulling project is 2.5m, the thickness of the artificial false bottom 7 is 1m, and the strength is not less than 5MPa;

[0039] S4. First, the first-step mining area 1 is mined and filled in stages from bottom to top, and then the second-step mining area 2 is mined and filled in stages from bottom to top according to the same process.

[0040] In step S4, the mining and filling process of each stope is the same, including the following steps:

[0041] (1) Mining the ore body in the triangular pillar area near the hanging wall by using shallow holes (hole depth of less than 4 m) on the artificial false bottom 7 of the first-step mining site 1 or the second-step mining site 2 to form an inclined roof, and filling the space of the artificial ore-receiving triangular pillar with tailings to form an artificial ore-receiving triangular pillar 8;

[0042] Specifically, the top plate inclination angle of the artificial ore-receiving triangular column 8 is not less than 45°, that is, the inclined surface inclination angle of the artificial ore-receiving triangular column 8 formed after filling is not less than 45°;

[0043] (2) excavating the vein roadway 5 at the junction of the artificial ore receiving triangular pillar 8 and the footwall of the ore body along the strike of the ore body, and excavating the ore through the vein 3 in the lowest stage of the off-vein transport roadway 4 along the direction perpendicular to the ore body and connecting with the vein roadway 5;

[0044] Specifically, the specification of the stage ore-exiting vein 3 is 2.4m×2.4m, wherein the stage ore-exiting vein 3 of the lowest stage is obliquely intersected with the stage vein-side roadway 5 of the stage, and the stage ore-exiting vein 3 of the remaining stages is horizontally intersected with the stage vein-side roadway 5 of the stage where it is located; the specification of the stage vein-side roadway 5 is 2.5m×2.5m;

[0045] (3) During the above stage, long grouting anchor cables 9 are constructed along the vein tunnel 5 toward the upper wall of the ore body to reinforce the surrounding rock of the upper wall of the ore body in advance;

[0046] Specifically, the row spacing of the grouting long anchor cables 9 is 2.5m, with 3 to 4 anchor cables in each row. The length of the grouting long anchor cables 10 is 15 to 20m, and the spacing between each grouting long anchor cable and the surrounding rock interface of the upper wall is 2.5 to 3m.

[0047] (4) In the stage-by-stage vein tunnel 5, a medium-long hole drill is used to drill upward a fan-shaped medium-long hole 11, and the blastholes near the upper wall area of the stope roof are longer than the blastholes near the lower wall, so that the top of the stope forms an inclined surface, and the fan-shaped medium-long holes 11 are charged in the stage-by-stage vein tunnel 5, and detonated hole by hole using a micro-difference detonation method to form an inclined stope roof; the roof formed after the blasting of the fan-shaped medium-long hole 11 in each stage is an inclined surface, and its inclination angle is not less than 45°;

[0048] Specifically, the number of the fan-shaped medium-long holes 11 is determined according to the actual occurrence state of the ore body, the blasthole row spacing is 1.2 to 1.4 meters, and the hole bottom distance is 1.4 to 1.6 meters. Each row of blastholes is subjected to micro-difference detonation from the middle blasthole to the two ends, and the micro-difference interval time is 50ms. In order to ensure that the eyebrow line is not destroyed, the length of the hole mouth reserved for uncharged is determined according to the hole bottom distance parameter, and the overall hole mouth is staggered and spaced.

[0049] (5) The ore that has collapsed in the stope is shoveled and loaded into the ore chute 12 by a scraper through the staged ore vein 3 and transported out of the stope;

[0050] (6) After all the ore in the stope is exhausted, a filling retaining wall 15 is erected in the ore-exiting vein 3 in the stope stage, and a filling borehole 6 is constructed in the outer vein transport tunnel 4, which is one stage away from the current stage, to the highest point of the stope void. The filling pipeline passes through the filling borehole 6 into the void, and the entire goaf is cemented with tailings to form a tailings cemented filling body 10. When filling the stope, the entire void must be filled so that the filling body of each stage forms an inclined surface at the top, and forms the artificial ore-receiving triangular pillar 8 of the previous stage.

[0051] (7) In the ore body, along the artificial ore-bearing triangular pillar 8 formed in step (6) and the boundary line of the ore body footwall, the vein tunnel 5 is excavated, and the mining and filling are carried out stage by stage from bottom to top according to the process of steps (2) to (6) until the first-step mining area 1 or the second-step mining area 2 is fully mined.

[0052] Specifically, when the upper stage is mined, the stage vein tunnel 5 and the stage ore-exiting vein 3 are constructed after the lower stage stope is mined and filled. The stage vein tunnel 5 is located between the artificial triangular column 8 and the boundary of the ore body footwall.

[0053] When an enterprise adopts a steeply inclined crushed ore body upward fan-shaped medium-deep hole stage filling mining method in this embodiment to recover the steeply inclined crushed ore body, the work of cutting the top roof maintenance is reduced, the labor intensity of workers is reduced, the scraper operates in the tunnel, ensuring the safe operation of the scraper and improving the ore-exporting efficiency of the scraper. Compared with the ore-exporting method of using a remote-controlled scraper to enter the empty area, the ore-exporting efficiency is increased by more than 1 times, and the safety of the mining site operation is improved, which brings higher economic and safety benefits to the enterprise.

[0054] In summary, the present invention provides a method for staged filling mining of upward fan-shaped medium-deep holes in a steeply inclined broken ore body, which adopts upward fan-shaped medium-deep holes for mining blasting, and adopts a scraper to mine in the staged mining vein, and the equipment does not need to enter the empty area to operate, which significantly improves the mining efficiency and safety of the mining operation; the grouting long anchor cable is used to advance the reinforcement of the surrounding rock of the ore body, and by injecting cement slurry into the cracks of the surrounding rock under high pressure, combined with the suspension effect of the long anchor cable, the stability of the surrounding rock of the upper plate of the mining area can be effectively improved, the collapse of the surrounding rock of the upper plate after mining can be avoided, and the loss and depletion of ore can be reduced; in the mining area The artificial false bottom is laid in the lowest stage, avoiding the need to reserve a top pillar when mining in the lower middle section, thus reducing the ore loss rate. At the same time, the artificial false bottom can effectively separate the upper and lower middle sections of the stope, preventing the depletion of ore due to the damage to the upper filling body when mining in the lower stope. During the mining in the stope, shallow holes are first used to mine and fill the triangular pillar area near the hanging wall, forming an artificial ore-receiving triangular pillar. This ensures that personnel do not enter the empty area to work during rock drilling and ore extraction, ensuring the safety of the operation. At the same time, the hanging wall triangular pillar is recovered in advance to avoid the loss of this part of the ore due to the influence of the natural repose angle of the ore. During each stage of mining, the shape of the stope roof is controlled by the length of the blasthole. The inclined stope roof is formed in one go through blasting, and the hanging wall ore-receiving triangular pillar is directly formed after the goaf is filled. This ensures that during the upper stage of mining, rock drilling and blasting are carried out directly in the stage-by-stage vein tunnel, avoiding the need for premature roof cutting operations, which can greatly reduce the labor intensity of the stope and improve the mining efficiency of the stope. During mining operations, personnel and equipment are primarily located within the tunnels, reducing safety risks in the stope. This technical solution is simple to implement, reduces labor intensity, and improves operational safety. Ultimately, this solution will enable safe, efficient, and economical mining of steeply inclined, crushed ore bodies, safeguarding the company's long-term development.

[0055] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. The method of step-by-step filling mining of upward fan-shaped medium-deep holes in steeply inclined broken ore bodies is characterized by: The steps include: S1. Divide the stope to be mined into a first-step stope and a second-step stope, and divide the stope into several stages along the vertical direction; the overall mining sequence is to first mine the first-step stope and then mine the second-step stope; S2. Excavate a ramp in the footwall of the stope to be mined, and excavate connecting roads from the ramp at every stage height toward the ore body to serve as access to and from the stope; excavate off-vein haulage lanes at every stage height along the strike of the ore body, with the off-vein haulage lanes communicating with the connecting roads at the corresponding stages; S3. Excavate a bottom tunnel at the lowest stage of the stope and carry out bottom pulling work in the bottom tunnel to pull the ore body apart completely. Then, use tailings cementation filling to lay an artificial false bottom in the bottom pulling space. S4. Mining the ore body in the triangular pillar area near the hanging wall by shallow holes on the artificial false bottom of the first-step mining site or the second-step mining site to form an inclined roof, and cementing and filling the artificial triangular pillar space formed after mining with tailings to form an artificial ore-receiving triangular pillar; S5. Excavate a vein-along laneway at the junction of the artificial ore-receiving triangular pillar and the footwall of the ore body along the strike of the ore body, and excavate a vein-along laneway perpendicular to the ore body in the lowest stage of the off-vein transport laneway, and the vein-along laneway is connected with the vein-along laneway; S6. During the above stage, long grouting anchor cables are constructed along the vein tunnel toward the upper wall of the ore body to reinforce the surrounding rock of the upper wall of the ore body in advance; S7. Drilling fan-shaped medium-long holes upward in the roadway along the vein at the stage using a medium-long hole drill, wherein the blastholes in the stope roof near the hanging wall are longer than the blastholes near the footwall, so that the top of the stope forms an inclined surface; charging the fan-shaped medium-long holes in the roadway along the vein at the stage, and detonating each hole one by one using a micro-difference detonation method, thereby forming an inclined stope roof; S8. The ore that has collapsed in the stope is shoveled and loaded into the ore chute and transported out of the stope by a scraper through the vein in the above-mentioned stages; S9. After all the ore in the stope is exhausted, a filling retaining wall is erected in the stage ore-extraction vein, and a filling borehole is constructed in the outer-vein transport tunnel, which is one stage away from the current stage, to the highest point of the stope void. A filling pipeline is passed through the filling borehole into the goaf, and the entire goaf is cemented with tailings through the filling pipeline to form a tailings cemented filling body. The filling body forms an inclined surface at the top, which serves as the artificial ore-receiving triangular pillar of the previous stage. S10. In the ore body, along the artificial ore-bearing triangle formed by S9 and the boundary line of the ore body footwall, the vein tunnel is excavated, and mining and filling are carried out stage by stage from bottom to top according to the procedures of S5 to S9 until all the mining of the first-step mining area is completed; then mining and filling are carried out on the second-step mining area according to the same procedures until all the ore bodies in the mining area are mined.

2. The method for upward fan-shaped medium-deep hole stage filling mining of steeply inclined broken ore bodies according to claim 1 is characterized in that: This method is suitable for steeply inclined ore bodies with an inclination greater than 55° and a thickness greater than 4 to 15 meters.

3. The method for upward fan-shaped medium-long hole stage filling mining of steeply inclined broken ore bodies according to claim 1 is characterized in that: In step S1, the length of the first-step mining area and the second-step mining area is 25-30m; the stage height is 12-15m.

4. The method for upward fan-shaped medium-long hole stage filling mining of a steeply inclined broken ore body according to claim 1 is characterized in that: In step S3, the height of the bottom pulling project is 2.5m; the thickness of the artificial false bottom is 1m, and the strength is not less than 5MPa.

5. The method of upward fan-shaped medium-long hole stage filling mining of steeply inclined broken ore bodies according to claim 1 is characterized in that: In step S4, the angle of the slope of the artificial ore-bearing triangular prism formed is not less than 45°.

6. The method of upward fan-shaped medium-long hole stage filling mining of steeply inclined broken ore bodies according to claim 1 is characterized in that: In step S5, the specifications of the stage ore-exiting vein are 2.4m×2.4m, among which the stage ore-exiting vein of the lowest stage is obliquely intersected with the stage vein-side tunnel of that stage, and the stage ore-exiting veins of the remaining stages are horizontally intersected with the stage vein-side tunnel of their respective stages; the specifications of the stage vein-side tunnel are 2.5m×2.5m.

7. The method of upward fan-shaped medium-deep hole stage filling mining of steeply inclined broken ore bodies according to claim 1 is characterized in that: In step S6, the spacing of the grouting long anchor cables is 2.5m, with 3 to 4 cables in each row, the length of each grouting long anchor cable is 15 to 20m, and the spacing between each grouting long anchor cable and the surrounding rock interface of the hanging wall is 2.5 to 3m.

8. The method of upward fan-shaped medium-deep hole stage filling mining of steeply inclined broken ore bodies according to claim 1 is characterized in that: In step S7, the number of fan-shaped medium and deep holes is determined according to the actual occurrence state of the ore body, the blasthole row spacing is 1.2 to 1.4 m, the hole bottom distance is 1.4 to 1.6 m, and each row of blastholes is micro-difference detonated hole by hole from the middle blasthole to both ends, and the micro-difference interval time is 50 ms. In order to ensure that the eyebrow line is not destroyed, the length of the hole mouth reserved for uncharged is determined according to the hole bottom distance parameter, and the overall hole mouth is staggered and spaced.

9. The method of upward fan-shaped medium-long hole stage filling mining of steeply inclined broken ore bodies according to claim 1 is characterized in that: In step S7, the inclined stope roof formed after the sector-shaped medium- and long-hole blasting in each stage has an inclination angle of not less than 45°.

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