Separate mining and subsequent filling mining method and structure suitable for steeply inclined multi-layer thick and large ore body

Abstract

The invention provides a separate mining subsequent filling mining method and structure suitable for a steeply inclined multi-layer thick and large ore body, and relates to the technical field of filling mining, the method comprises the following steps: S1, the ore body is divided into a middle layer ore body, a hanging wall ore body and a footwall ore body; s2, the middle layer ore body is stoped; s3, the panel ore body is stoped; and S4, the panel ore pillars and the isolation ore pillars are stoped. The step S3 comprises the sub-steps that S31, the hanging panel ore body is stoped; and S32, the footwall ore body is stoped. According to the mining method, multiple mining methods can be combined for use, separate collection of different ore types is achieved, dilution loss caused by ore mixing in a stope is avoided, the recycling efficiency of resources is improved, and therefore the mining efficiency of the mining method can be improved when steeply-inclined multi-layer thick and large ore bodies are mined. The ore recovery rate, the production efficiency and the operation safety can be greatly improved, the ventilation effect is improved, and accurate mining projects are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of filling mining, and in particular to a mining method and structure suitable for subdividing and subsequently filling a steeply inclined multi-layer thick ore body. Background Art

[0002] At present, in metal and non-metal underground mines, the staged emptying and subsequent filling mining method is often used for steeply inclined thick ore bodies. This mining method is divided into one-step and two-step recovery, and stage transportation tunnels are set up in the upper and lower plates or pillars. The mining ratio is small, the mining cost is low, and the recovery efficiency is high. However, this mining method is only applicable to a single ore body and has poor adaptability to the separate mining of multiple ore bodies. Since the ore body has a certain angle, the vertical layout of the stope will inevitably lead to the existence of multiple ore bodies in the stope, making sorting difficult. If the upward horizontal layered filling method is used to achieve separate mining, the mining ratio is large, the mining cost is high, and the recovery efficiency is low.

[0003] The search application number CN202311566014.5 discloses an efficient filling mining method for the separation of gently inclined double-layer ore bodies. The method divides the pan area along the direction of the ore body, firstly, the upper ore body of the pan area is mined by the upward approach filling method, and an artificial false roof is built at the bottom of the upper ore body, and then the lower ore body of the pan area is mined by segmented medium-deep hole blasting. By mining the upper and lower ore bodies of the pan area respectively, the problem of high depletion rate caused by mixing the upper and lower ore is avoided; and an artificial false roof is built at the bottom of the upper ore body, which provides safe support for the mining of the lower ore body and ensures the safety of the mining of the lower ore body.

[0004] Although the above patent uses segmented medium-deep hole blasting to recover the lower ore body under the support of an artificial false roof, which can improve the recovery efficiency of a gently inclined double-layer ore body, the recovery efficiency of the upper ore body of this method is low, the cost of constructing an artificial false roof is high, and the blasting of the lower ore body uses deep hole blasting, which can easily destroy the artificial false roof of the direct roof, causing instability in the mining field.

[0005] Moreover, the paper "Application of Artificial Cushion Mining with Separate Mining and Blasting Room and Pillar Mining in Dongliujia Gold Mine" proposes a room and pillar method with artificial cushion to separate ore waste. This method uses the waste conveyor belt of the concentrator as an artificial cushion to separate blasted ore and waste rock. It can effectively separate different types of minerals and avoid dilution losses, but the labor productivity is low and it is only suitable for horizontal to gently inclined thin ore bodies. Summary of the invention

[0006] The purpose of the present invention is to address the problem that the current method of mining with subsequent filling of steeply inclined multi-layer thick ore bodies cannot achieve separate mining of multiple mineral types, easily causes ore mixing and difficulty in sorting, and cannot achieve efficient and low-cost mining of multiple mineral types.

[0007] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0008] A method for mining with subdivision and subsequent filling applicable to steeply inclined multi-layer thick ore bodies comprises the following steps:

[0009] S1: The ore body is divided into the middle layer ore body, the hanging wall ore body and the foot wall ore body;

[0010] S2: mining the middle layer ore body;

[0011] S3: mining area ore body;

[0012] S4: Mining panel area pillars and isolation pillars.

[0013] As a preferred technical solution of this application, the S3 step includes:

[0014] S31: Mining the hanging wall ore body;

[0015] S32: Mining the lower ore body.

[0016] As a preferred technical solution of the present application, the step S1 includes: dividing the ore body into a plurality of mining middle sections, wherein a rail transport level for transporting the ore in the mining middle section from the panel chute to the main chute is provided for every 2-3 mining middle sections, a mining unit is provided between the 2-3 mining middle sections and a rail transport level, top and bottom pillars are provided between each mining unit, and upward mining is adopted in each mining unit without top and bottom pillars;

[0017] The horizontal elevation of the rail transport within the mining unit is 20m lower than the lowest middle section elevation. The rail transport level is set in the panel pillar to avoid ore compression. The difference in mining elevation between the two mining units is 5-10m.

[0018] As a preferred technical solution of the present application, the step S2 includes: arranging stage transport tunnels in the upper plate ore body and the lower plate ore body respectively, arranging vein tunnels and plate area chute in the plate area ore pillars, setting up double tunnel rock drilling chambers and cutting cross tunnels at the top of the stope, and setting up bottom tunnels, V-shaped trenches and mine access roads at the bottom of the stope;

[0019] Cutting shafts and cutting grooves are arranged in the mining area, and vertical deep holes are used to use the cutting grooves as free surfaces and compensation spaces for lateral ore collapse.

[0020] As a preferred technical solution of the present application, the step S31 includes: setting an extra-vein transport tunnel in the surrounding rock outside the upper plate ore body, arranging a vein tunnel and a plate area chute in the plate area ore pillar of the upper plate ore body, setting a bottom tunnel, a V-shaped trench and a mine access road at the bottom of the stope, and setting a segmented connecting tunnel and a segmented rock drilling tunnel of each stope;

[0021] The lower wall of the upper ore body mining area is the filling body. A cutting shaft and a cutting groove are set on the side close to the filling body, and the upward fan-shaped holes are used in the segmented rock drilling tunnel to collapse the ore laterally.

[0022] As a preferred technical solution of the present application, the step S32 includes: reserving an isolation pillar in the lower plate ore body, setting a lower plate vein transport tunnel, a segmented connecting tunnel and a plate area chute in the surrounding rock outside the lower plate ore body, arranging a vein-penetrating tunnel in the lower plate ore body plate area pillar, the segmented rock drilling tunnels in each stope are connected with the segmented connecting tunnels, and the stope adopts a flat-bottomed ore discharge structure;

[0023] An isolation pillar is set between the lower plate ore body mining area and the middle layer ore body mining area, and a cutting groove is set on the side close to the isolation pillar.

[0024] As a preferred technical solution of the present application, the step S4 includes: mining from the lower plate ore body to the upper plate ore body in sequence, and controlling the length of the stope;

[0025] The mining of the panel pillars should be carried out after the ore body is completely mined. The mining sequence of the pillars should be the lower panel mining area, isolation pillars, middle layer mining area of ​​the panel pillars, and upper panel mining area.

[0026] As the preferred technical solution of the present application, the mining method in step S2 is the empty-field and subsequent filling mining method in the large-diameter deep hole stage, the mining method in step S31 is the empty-field and subsequent filling mining method in the segmented rock drilling stage, the mining method in step S32 is the empty-field and subsequent filling mining method in the segmented rock drilling stage, the mining method for the panel pillars in step S4 is the empty-field and subsequent filling mining method in the segmented rock drilling stage, and the mining method for the isolation pillars is the upward horizontal layered filling mining method.

[0027] The present invention also discloses a structure suitable for the sub-mining and subsequent filling mining of steeply inclined multi-layer thick ore bodies, comprising a stage transport tunnel arranged in the upper plate ore body and the lower plate ore body, a vein-penetrating tunnel and a plate-area chute arranged in the plate-area ore pillars and connected to each other, an outer-vein transport tunnel and a segmented connecting tunnel arranged outside the upper and lower plate veins, a bottom-pulling tunnel and an ore-discharging access road arranged at the bottom of the mining field, and a rock drilling chamber arranged at the top of the mining field, wherein the bottom-pulling tunnel and the rock drilling chamber are both connected to the stage transport tunnel, the vein-penetrating tunnel and the stage transport tunnel are both connected to the outer-vein transport tunnel, the bottom-pulling tunnel, the ore-discharging access road and the rock drilling chamber are both connected to the stage transport tunnel, and the segmented connecting tunnel is connected to the outer-vein transport tunnel through an inclined ramp.

[0028] As the preferred technical solution of the present application, the internal dimensions of the stage transport tunnel are 4-6m wide and 3-4m high; the internal dimensions of the vein-penetrating tunnel are 4-6m wide and 3-4m high; the internal dimensions of the disk area chute are 2-4m in diameter; the internal dimensions of the extra-vein transport tunnel are 4-6m wide and 3-4m high; the internal dimensions of the segmented connecting tunnel are 4-6m wide and 3-4m high; the internal dimensions of the bottom tunnel are 3-5m wide and 3-4m high; the internal dimensions of the mine access road are 3-5m wide and 3-4m high; the internal dimensions of the rock drilling chamber are 4-7m wide and 3-4m high.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The technical solution of the present application can combine a variety of mining methods for use, which not only realizes the separate collection of different minerals, avoids the loss of depletion caused by the mixing of ores in the mining field, and improves the efficiency of resource recovery and utilization; it can also realize the recovery of different minerals at different times. For mines with protected minerals or quota minerals, the quota mineral bodies can be protected in situ while recovering other minerals, which will not affect future recovery; and the recovery of pan-area pillars can be realized at the end of the recovery period, and the additional mining and approval engineering is less, which further improves the resource recovery rate; and in different The mining and preparation works during the recovery period can be reused, which greatly reduces the amount of mining and preparation works, reduces the mining-to-cut ratio, reduces initial investment, and has good economic benefits. Compared with other traditional separate mining methods, this application adopts deep hole blasting, and the rock drilling and mining operations are separated, with high operating efficiency. Personnel working in the tunnel do not need to enter the empty area, and the ventilation in the mining area is lower air intake and upper return, with good ventilation conditions and improved mining safety. Therefore, when mining steeply inclined, multi-layered, thick ore bodies, the ore recovery rate, production efficiency and operating safety can be greatly improved, the ventilation effect can be improved, and the mining and preparation works can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a diagram of the mining method when the middle layer ore body is mined;

[0032] Figure 2 This is a diagram of the mining method when the upper ore body is mined;

[0033] Figure 3 This is a diagram of the mining method when the lower wall ore body is mined;

[0034] Figure 4 This is a diagram of the mining method when mining the pillars in the lower ore body area;

[0035] Figure 5 Diagram of mining method for isolated pillar mining;

[0036] Figure 6 This is a diagram of the mining method when mining the pillars in the middle layer ore body panel area;

[0037] Figure 7 This is a diagram of the mining method when mining the pillars in the upper ore body area.

[0038] Indicated in the figure:

[0039] 1. Stage transport tunnel; 2. Vein tunnel; 3. Pan area chute; 4. Double tunnel rock drilling chamber; 5. Cutting cross tunnel; 6. Bottom tunnel; 7. "V"-shaped trench; 8. Mine access road; 9. Off-vein transport tunnel; 10. Cutting skylight; 11. Segmented connecting tunnel; 12. Segmented rock drilling tunnel; 13. Filling return air shaft. DETAILED DESCRIPTION

[0040] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described clearly and completely in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them.

[0041] like Figures 1 to 7 As shown, this embodiment proposes a method for mining with subdivision and subsequent filling applicable to steeply inclined multi-layer thick ore bodies, comprising the following steps:

[0042] S1: The ore body is divided into the middle layer ore body, the hanging wall ore body and the foot wall ore body;

[0043] Specifically, the ore body is divided into a plurality of mining middle sections, wherein a rail transport level is set for transporting the ore of the mining middle section from the plate area chute to the main chute for every 2-3 mining middle sections, a mining unit is set between the 2-3 mining middle sections and a rail transport level, top and bottom pillars are set between each mining unit, and upward mining is adopted in each mining unit without top and bottom pillars, and the intermediate layer ore body, the upper plate ore body and the lower plate ore body are divided according to the ore body boundary;

[0044] It should be noted that the horizontal elevation of the rail transportation in the mining unit is 20m lower than the lowest middle section elevation of the mining. The rail transportation level is set in the disk area pillars in the ore body to avoid ore compression. The difference in mining elevation between the two mining units is 5-10m, that is, the thickness of the top and bottom pillars between the mining units is 5-10m.

[0045] S2: mining the middle layer ore body;

[0046] Specifically, a large-diameter deep-hole staged empty-field and subsequent filling mining method is adopted, and stage transportation tunnels 1 are arranged in the upper plate ore body and the lower plate ore body respectively, and vein tunnels 2 and plate chute 3 are arranged in the plate area ore pillars, double tunnel rock drilling chambers 4 and cutting cross tunnels 5 are set at the top of the stope, and bottom pull tunnels 6, V-shaped trenches 7 and mine access roads 8 are set at the bottom of the stope;

[0047] It should be noted that the middle layer mining area and the lower plate ore body mining area are divided by the mining boundary, cutting shafts and cutting grooves are arranged at appropriate positions in the mining area, and vertical deep holes are used with the cutting grooves as free surfaces and compensation space for lateral ore collapse. The length of blastholes close to the lower plate is strictly controlled to avoid damage to the lower plate ore body during blasting.

[0048] S3: mining area ore body;

[0049] Wherein, the S3 step further includes:

[0050] S31: Mining the hanging wall ore body;

[0051] Specifically, the method of mining with empty pit and subsequent filling in the stage of segmented rock drilling is adopted, an outer-vein transport tunnel 9 is set in the surrounding rock outside the upper plate ore body, a through-vein tunnel 2 and a plate chute 3 are arranged in the plate area ore pillar of the upper plate ore body, a bottom tunnel 6, a V-shaped trench 7 and a mine access road 8 are set at the bottom of the stope, and segmented connecting tunnels 11 and segmented rock drilling tunnels 12 of each stope are set;

[0052] It should be noted that the lower wall of the upper ore body mining area is the backfill body. A cutting shaft and a cutting groove are set on the side close to the backfill body. The upward fan-shaped holes are used for lateral caving in the segmented rock drilling tunnels. The ore is unearthed through a V-shaped trench at the bottom of the mining area. Controlled blasting should be used near the backfill body to reduce the impact of blasting on the backfill body.

[0053] S32: mining the footwall ore body;

[0054] Specifically, a segmented empty pit and subsequent filling mining method is adopted, an isolation pillar is reserved in the lower plate ore body, a lower plate vein transport tunnel 9, a segmented connecting tunnel 11 and a plate area chute 3 are set in the surrounding rock outside the lower plate ore body, a vein-penetrating tunnel 2 is arranged in the plate area pillar of the lower plate ore body, and the segmented rock drilling tunnel 12 in each stope is connected with the segmented connecting tunnel 11, and the stope adopts a flat-bottomed ore-exit structure;

[0055] It should be noted that an isolation pillar of a certain thickness should be set between the lower plate ore body mining area and the middle layer ore body mining area depending on the stability of the ore body to prevent the filling body of the middle layer mining area from collapsing into the lower plate mining area. In order to ensure the stability of the isolation pillar, the segmented empty site and subsequent filling method is adopted for recovery. A cutting groove is set on the side close to the isolation pillar. The segmented rock drilling tunnel in the mining area is responsible for both rock drilling and blasting and ore extraction, and the exposed area is reduced. The mining area adopts a flat-bottomed mining structure to improve the recovery rate, and the residual ore in the mining area is transported out by a remote-controlled shovel loader.

[0056] S4: Mining area pillars and isolation pillars;

[0057] Specifically, the plate area pillar adopts the method of open-pit mining followed by filling in the stage of segmented rock drilling, and the isolation pillar adopts the method of upward horizontal layered filling mining, making full use of the existing projects, mining from the lower plate ore body to the upper plate ore body in sequence, and controlling the length of the stope according to the ground pressure conditions;

[0058] It should be noted that the mining of the panel pillars should be carried out after the ore body is completely mined to avoid difficulties in ground pressure management. The mining sequence of the pillars should be as follows: the lower plate mining area of ​​the panel pillars (the method of filling the ore after the ore is mined in the staged rock drilling stage), the isolation pillars (the upward horizontal layered filling mining method), the middle layer mining area of ​​the panel pillars (the method of filling the ore after the ore is mined in the staged rock drilling stage), and the upper plate mining area of ​​the panel pillars (the method of filling the ore after the ore is mined in the staged rock drilling stage).

[0059] The present invention also discloses a structure suitable for the sub-mining and subsequent filling mining of steeply inclined multi-layer thick ore bodies, comprising a stage transport tunnel 1 arranged in the upper plate ore body and the lower plate ore body, a vein-penetrating tunnel 2 and a plate-area chute 3 arranged in the plate-area ore pillar and connected to each other, an outer-vein transport tunnel 9 and a segmented connecting tunnel 11 arranged outside the upper and lower plate veins, a bottom-pulling tunnel 6 and an ore-discharging access 8 arranged at the bottom of the stope, and a rock-drilling chamber 4 arranged at the top of the stope, wherein the bottom-pulling tunnel 6 and the rock-drilling chamber 4 are both connected to the stage transport tunnel 1, the vein-penetrating tunnel 2 and the stage transport tunnel 1 are both connected to the outer-vein transport tunnel 9, the bottom-pulling tunnel 6, the ore-discharging access 8 and the rock-drilling chamber 4 are both connected to the stage transport tunnel 1, and the segmented connecting tunnel 11 is connected to the outer-vein transport tunnel 9 through an inclined ramp;

[0060] The internal dimensions of the stage transport tunnel 1 are 4-6m wide and 3-4m high; the internal dimensions of the vein tunnel 2 are 4-6m wide and 3-4m high; the internal dimensions of the disk area chute 3 are 2-4m in diameter; the internal dimensions of the vein transport tunnel 9 are 4-6m wide and 3-4m high; the internal dimensions of the segmented connecting tunnel 11 are 4-6m wide and 3-4m high; the internal dimensions of the bottom tunnel 6 are 3-5m wide and 3-4m high; the internal dimensions of the mine access road 8 are 3-5m wide and 3-4m high; the internal dimensions of the rock drilling chamber 4 are 4-7m wide and 3-4m high;

[0061] It should be noted that Figure 1 The mine shown in the figure is a mine under construction. There are one-step mine and two-step mine in the mine. A panel pillar is set every 8 mines. A cutting groove is set in the middle of the mine, a rock drilling chamber is set on the top of the mine, and a V-shaped trench, a bottom lane and a mining lane are set at the bottom of the mine. The bottom lane is blasted upward into a fan-shaped hole to form a V-shaped trench, and the rock drilling chamber is blasted downward into a vertical deep hole to drop ore laterally. The length of the mine is 50-80m, and the width of the mine is 16-24m.

[0062] In addition, if Figure 1 As shown, the steps of the mining project are as follows:

[0063] During the period of mining the middle layer ore body: the stage transport tunnel 1 is excavated along the vein in the upper plate ore body and the lower plate ore body respectively, and then the through-vein tunnel 2 and the plate chute 3 are excavated in the plate area ore pillar. The internal dimensions of the stage transport tunnel 1 and the through-vein tunnel 2 are 4-6m wide and 3-4m high, and the internal dimension of the plate area chute 3 is 2-4m in diameter, completing the development project; continue to excavate the double-tunnel drilling chamber 4 and the cutting cross tunnel 5 at the top of the mining area. The internal dimensions of the drilling chamber 4 are 4-7m wide and 3-4m high, and the internal dimensions of the cutting cross tunnel 5 are 3-5m wide and 3-4m high. At the same time, a bottom tunnel 6, a V-shaped trench 7 and a mine access road 8 are set at the bottom of the mining area. The internal dimensions of the bottom tunnel 6 and the mine access road 8 are 3-5m wide and 3-4m high, completing the mining project.

[0064] like Figure 2 As shown, during the period of mining the upper plate ore body: the upper plate vein transport tunnel 9 is excavated in the surrounding rock outside the upper plate ore body, and then the vein-penetrating tunnel 2 and the plate area chute 3 are excavated in the plate area ore pillars of the upper plate ore body, and finally the segmented connecting tunnels 11 are set in each segment. The internal dimensions of the upper plate vein transport tunnel 9, the segmented connecting tunnel 11 and the vein-penetrating tunnel 2 are 4-6m wide and 3-4m high, and the internal dimensions of the plate area chute 3 are 2-4m in diameter, and the development project is completed; the bottom tunnel 6, V-shaped trench 7 and mine access road 8 are excavated at the bottom of the mining field, and the segmented rock drilling tunnels 12 of each mining field are excavated at the same time. The internal dimensions of the bottom tunnel 6, the mine access road 8 and the segmented rock drilling tunnel 12 are 3-5m wide and 3-4m high, and the mining project can be completed.

[0065] like Figure 3 As shown, during the period of mining the lower plate ore body: the lower plate vein transport tunnel 9, the segmented connecting tunnel 11 and the plate area chute 3 are excavated in the surrounding rock outside the lower plate ore body, the through-vein tunnel 2 is arranged in the plate area ore pillar of the lower plate ore body, the internal dimensions of the lower plate vein transport tunnel 9, the segmented connecting tunnel 11 and the through-vein tunnel 2 are 4-6m wide and 3-4m high, the internal dimensions of the plate area chute 3 are 2-4m in diameter, and the development project is completed; the segmented rock drilling tunnel 12 is excavated in each mining area, and the internal dimensions of the segmented rock drilling tunnel 12 are 3-5m wide and 3-4m high, and the mining project can be completed.

[0066] like Figure 4 , 6 As shown in 7, during the period of mining the pillars in the panel area: no additional mining approval project is required. During the period of mining and isolating the pillars, a new filling return air shaft 13 is required.

[0067] The cutting project includes the following steps: a cutting groove is formed by lateral blasting of a cutting shaft. When mining the middle layer ore body, the cutting shaft is arranged in the middle of the mining area; when mining the upper plate ore body, the cutting shaft is arranged on the side close to the filling body of the lower plate, and each section is arranged separately; when mining the upper plate ore body, the cutting shaft is arranged on the side close to the upper plate isolation pillar, and each section is arranged separately; when mining the lower plate ore body plate area pillar, the cutting shaft is arranged on the side close to the upper plate isolation pillar of the mining area, and each section is arranged separately; when mining the middle layer isolation pillar, the cutting shaft is arranged on the side close to the filling body of the lower plate of the mining area, and each section is arranged separately; when mining the upper plate ore body, the cutting shaft is arranged on the side close to the filling body of the lower plate of the mining area, and each section is arranged separately.

[0068] Rock drilling and blasting include the following steps: T-150 down-the-hole drilling rig is used for vertical deep holes, the diameter of the hole is 120-165mm, the hole depth is 40m, the hole spacing is 3-4m, and the row spacing is 3-3.5m. The first step of side mining adopts smooth blasting, and the second step of mining adopts buffer blasting; the YGZ-90 drilling rig with disc drill frame is used for upward fan-shaped deep holes, the diameter of the hole is 80mm, the hole bottom distance is 2-3m, and the row spacing is 2-2.5m. Multi-porous granular ammonium oil explosive and electronic detonator are used for differential detonation.

[0069] The ventilation steps are as follows: when mining the middle layer ore body, fresh air enters the goaf from the stage transport tunnel 1 on one side through the drilling chamber 4, and the polluted air flows out from the drilling chamber 4 on the other side through the stage transport tunnel 1; when mining the upper plate ore body, fresh air enters the mining area from the lower segmented drilling tunnel 12, and the polluted air flows out from the upper segmented drilling tunnel 12; when mining the lower plate ore body, fresh air enters the mining area from the upper segmented drilling tunnel 12, and the polluted air flows out from the cutting shaft 10 of the upper segmented mining area; when mining the plate area pillar mining area, fresh air enters the mining area from the lower segmented drilling tunnel 12, and the polluted air flows out from the upper segmented drilling tunnel 12; when mining the isolation pillar mining area, fresh air enters the mining area from the segmented drilling tunnel 12, and the polluted air returns to the segmented drilling tunnel 12 of the upper segment from the filling return air shaft.

[0070] The mining steps are as follows: when mining the middle layer ore body, the upper plate ore body and the plate area pillars, the scraper shovels the ore from the V-shaped trench at the bottom of the mining area; when mining the lower plate ore body, the scraper ore is mined in the rock drilling tunnel, and the residual ore in the mining area is recovered by the remote-controlled scraper ore; when mining the isolation pillars, the scraper ore is mined in the horizontal layered mining area; the ore is poured into the plate area chute, and then transported to the main chute by rail.

[0071] The ground pressure management steps are as follows: In each mining period, filling can be carried out after the mining of the ore chamber is completed. After the mining of the first-step ore chamber is completed, tailings cementation filling is used; after the mining of the second-step ore chamber is completed, non-cementation filling of the goaf is used; when the intermediate layer ore body is mined, the filling pipeline is led from the stage transportation tunnel (1) in the upper middle section to the goaf; when the upper plate ore body is mined, the filling pipeline is led from the vein transport tunnel 9 in the upper middle section to the goaf; when the lower plate ore body is mined, the filling pipeline is led from the segmented connecting tunnel 11 in the upper section to the goaf; when the plate area pillar is mined, the filling pipeline is led from the vein tunnel to the mining site; when the isolation pillar is mined, the filling pipe enters the mining site from the filling return air shaft.

[0072] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the above specific implementation methods. Therefore, any modification or equivalent replacement of the present invention; all technical solutions and improvements that do not depart from the spirit and scope of the invention are included in the scope of the claims of the present invention.

Claims

1. A method for mining with subdivision and subsequent filling suitable for steeply inclined multi-layer thick ore bodies, characterized in that: The following steps are involved: S1: The ore body is divided into the middle layer ore body, the hanging wall ore body and the foot wall ore body; S2: mining the middle layer ore body; S3: mining area ore body; S4: Mining panel area pillars and isolation pillars.

2. A method for mining with subdivision and subsequent backfilling suitable for steeply inclined multi-layer thick ore bodies according to claim 1, characterized in that: The S3 step includes: S31: Mining the hanging wall ore body; S32: Mining the lower ore body.

3. A method for mining with subdivision and subsequent backfilling suitable for steeply inclined multi-layer thick ore bodies according to claim 1, characterized in that: The step S1 comprises: dividing the ore body into a plurality of mining sections, wherein a rail transport level is provided for every 2-3 mining sections to transport the ore in the mining section from the panel chute to the main chute, a mining unit is provided between the 2-3 mining sections and the rail transport level, top and bottom pillars are provided between the mining units, and upward mining is adopted in each mining unit without top and bottom pillars; The horizontal elevation of the rail transport within the mining unit is 20m lower than the lowest middle section elevation. The rail transport level is set in the panel pillar to avoid ore compression. The difference in mining elevation between the two mining units is 5-10m.

4. The method of mining with subsequent filling applicable to steeply inclined multi-layer thick ore bodies according to claim 1, characterized in that: The step S2 comprises: arranging stage transport tunnels (1) in the upper plate ore body and the lower plate ore body respectively, arranging vein tunnels (2) and plate chute (3) in the plate area ore pillars, setting up double tunnel rock drilling chambers (4) and cutting cross tunnels (5) at the top of the stope, and setting up bottom tunnels (6), V-shaped trenches (7) and ore exit routes (8) at the bottom of the stope; Cutting shafts and cutting grooves are arranged in the mining area, and vertical deep holes are used to use the cutting grooves as free surfaces and compensation spaces for lateral ore collapse.

5. The method of mining with subsequent filling applicable to steeply inclined multi-layer thick ore bodies according to claim 2, characterized in that: The step S31 comprises: setting an out-vein transport tunnel (9) in the surrounding rock outside the upper ore body, arranging a vein tunnel (2) and a chute (3) in the ore column of the upper ore body, setting a bottom tunnel (6), a V-shaped trench (7) and a mine access road (8) at the bottom of the stope, and setting a segmented connecting tunnel (11) and a segmented rock drilling tunnel (12) of each stope; The lower wall of the upper wall ore body mining area is a filling body. A cutting skylight and a cutting groove are set on one side close to the filling body. The upward fan-shaped holes are used in the segmented rock drilling tunnel (12) to collapse the ore laterally.

6. A method for mining with subdivision and subsequent backfilling suitable for steeply inclined multi-layer thick ore bodies according to claim 5, characterized in that: The step S32 comprises: reserving an isolation pillar in the lower plate ore body, setting a lower plate outer vein transport tunnel (9), a segmented connecting tunnel (11) and a plate area chute (3) in the surrounding rock outside the lower plate ore body, arranging a vein-penetrating tunnel (2) in the plate area pillar of the lower plate ore body, the segmented rock drilling tunnel (12) in each stope is connected with the segmented connecting tunnel (11), and the stope adopts a flat-bottomed ore discharge structure; An isolation pillar is set between the lower plate ore body mining area and the middle layer ore body mining area, and a cutting groove is set on the side close to the isolation pillar.

7. A method for mining with subdivision and subsequent backfilling suitable for steeply inclined multi-layer thick ore bodies according to claim 1, characterized in that: The step S4 includes: mining from the lower plate ore body to the upper plate ore body in sequence, and controlling the length of the stope; The mining of the panel pillars should be carried out after the ore body is completely mined. The mining sequence of the pillars should be the lower panel mining area, isolation pillars, middle layer mining area of ​​the panel pillars, and upper panel mining area.

8. The method of mining with subsequent backfilling applicable to steeply inclined multi-layer thick ore bodies according to claim 2, characterized in that: The mining method in step S2 is the empty-field and subsequent filling mining method in the large-diameter deep hole stage, the mining method in step S31 is the empty-field and subsequent filling mining method in the segmented rock drilling stage, the mining method in step S32 is the empty-field and subsequent filling mining method in the segmented rock drilling stage, the mining method for the panel pillars in step S4 is the empty-field and subsequent filling mining method in the segmented rock drilling stage, and the mining method for the isolation pillars is the upward horizontal layered filling mining method.

9. A structure suitable for the sub-mining and subsequent filling of steeply inclined multi-layer thick ore bodies, which adopts the sub-mining and subsequent filling mining method suitable for steeply inclined multi-layer thick ore bodies as claimed in any one of claims 1 to 8 for filling and mining, characterized in that: The invention comprises a stage transport tunnel (1) arranged in the upper plate ore body and the lower plate ore body, a vein tunnel (2) and a plate chute (3) arranged in the plate area ore pillar and connected to each other, an outer vein transport tunnel (9) and a segmented connecting tunnel (11) arranged outside the upper and lower plate veins, a bottom tunnel (6) and an ore discharge route (8) arranged at the bottom of the mining area, and a rock drilling chamber (4) arranged at the top of the mining area, wherein the bottom tunnel (6) and the rock drilling chamber (4) are both connected to the stage transport tunnel (1), the vein tunnel (2) and the stage transport tunnel (1) are both connected to the outer vein transport tunnel (9), the bottom tunnel (6), the ore discharge route (8) and the rock drilling chamber (4) are both connected to the stage transport tunnel (1), and the segmented connecting tunnel (11) is connected to the outer vein transport tunnel (9) through an inclined ramp.

10. According to claim 9, a structure suitable for the sub-mining and subsequent filling and mining of steeply inclined multi-layer thick ore bodies, the internal dimensions of the stage transportation tunnel (1) are 4-6m wide and 3-4m high; the internal dimensions of the vein-penetrating tunnel (2) are 4-6m wide and 3-4m high; the internal dimensions of the disk area chute (3) are 2-4m in diameter; the internal dimensions of the extra-vein transportation tunnel (9) are 4-6m wide and 3-4m high; the internal dimensions of the segmented connecting tunnel (11) are 4-6m wide and 3-4m high; the internal dimensions of the bottom tunnel (6) are 3-5m wide and 3-4m high; the internal dimensions of the mine access road (8) are 3-5m wide and 3-4m high; the internal dimensions of the rock drilling chamber (4) are 4-7m wide and 3-4m high.

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