A method and system for open-pit coal mine side slope coal pressure filling mining

Abstract

The application discloses an open coal mine side slope pressure coal cooperative filling mining method and system, and the mining method comprises the following steps: S10, investigating the geological conditions of the open coal mine side slope pressure coal resources, designing the mining parameters of the side slope mining tunnel (1), and numbering in sequence, wherein the mining parameters comprise width, length and inclination; S20, using the side slope coal mining equipment to complete the mining of a plurality of mining tunnels (1) according to the preset parameters and the specified mining mode, and arranging the filling drill holes (6) at intervals above each overlying step (2) of the mining tunnel (1); S30, using the gangue throwing filling machine (4) to throw and fill the discarded gangue stripped from the overlying step (2) of the open coal mine into the mined mining tunnel (1) to form a heap (5), and closing the mining tunnel entrance (17) after the completion of the heap (5); S40, injecting the paste filling material (7) into the mining tunnel (1) through the filling drill hole (6), closing the drill hole until full, and repeating the filling of the next mined side slope mining tunnel (1).

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of open coal mine side slope pressure coal mining, and particularly relates to an open coal mine side slope pressure coal cooperative filling mining method and system. BACKGROUND

[0002] In recent years, the number and output of open coal mines gradually increase. Due to the limitation of mining technology, the amount of side slope pressure coal is large, and the mining difficulty is high. The open mining stripping waste rock is gradually discharged to the internal dump with the movement of the working face, which leads to the burial of side slope pressure coal resources and causes a large amount of coal resource waste. At present, the end slope resource recovery technology mainly includes roadway mining or underground mining. The roadway mining method needs to leave a large number of coal pillars. Under the action of blasting power of the open coal mine, the coal pillars have a high possibility of instability and low safety. The end slope resource of the underground mining is affected by the original fissure, and the pressure of the goaf fire prevention and extinguishing is large, so the resource recovery is difficult.

[0003] The filling mining method has been the optimal solution for the recovery of coal mine pressure coal resources. However, the solid filling mining method has a low filling rate and is difficult to realize the filling roof. The paste filling mining method needs to crush the open side slope stripping waste rock to the slurry state, so as to be filled into the mining chamber. The gangue crushing process is complex, and the power consumption is high. Therefore, the present application proposes a solid and paste cooperative filling mining method for the open coal mine side slope pressure coal, which has complementary advantages, improves the filling roof rate, reduces the gangue crushing amount of the paste filling, and recovers as much end slope pressure coal resources as possible through the interval mining chamber cyclic filling mining. SUMMARY

[0004] The present application proposes a kind of open coal mine side slope pressure coal cooperative filling mining method and system according to the problems and needs proposed above, which can realize the above technical purposes and bring other technical effects due to the following technical features.

[0005] One purpose of the present application is to propose an open coal mine side slope pressure coal cooperative filling mining method, which includes the following steps:

[0006] S10: investigate the geological conditions of the open coal mine side slope pressure coal resources, design the mining parameters of the side slope mining chamber, and number in order, wherein the mining parameters include width, length and inclination;

[0007] S20: use the side slope coal mining equipment to mine multiple mining chambers according to the preset parameters and specified mining method, and interval arrange filling boreholes above each overburden step of the mining chamber;

[0008] S30: use the gangue throwing filling machine to throw the open coal mine overburden step stripping waste gangue into the mined mining chamber to form a heap, and close the mining chamber entrance after completing the heap;

[0009] S40: injecting the paste filling material into the mined-out stope through the filling drill hole until the filling drill hole is closed after being filled, and repeating the filling of the next mined-out stope.

[0010] In addition, the open-pit coal mine side-hill pressure coal coordinated filling mining method according to the present application can further have the following technical features:

[0011] In one example of the present application, in the step S10, the width of the mined-out stope is determined by the side-hill coal mining equipment and the overlying bench stability, and the width of the mined-out stope is kept at 3m-6m; the length of the mined-out stope is determined by the open-pit mine boundary range, and the length of the mined-out stope should not exceed 400m, and the angle of the mined-out stope should be downward, and the angle is 0-10°.

[0012] In one example of the present application, in the step S20, the designated mining mode of the plurality of mined-out stopes is that the next mined-out stope is recovered after the previous mined-out stope is sequentially mined out, and the interval is an integral multiple of the width of the mined-out stope.

[0013] In one example of the present application, the calculation expression of the next mined-out stope recovered at an interval of an integral multiple of the width of the mined-out stope is:

[0014]

[0015] In the formula, [N] is the width multiple of the mined-out stope, and is automatically rounded; Q is the width of the plastic zone of the coal pillar, d is the width of the mined-out stope, H is the height of the coal body, γ is the unit weight of the overlying rock mass, k is the peak pressure coefficient, and is taken as 2.5, is the internal friction angle of the coal body, and c is the cohesion of the coal body.

[0016] In one example of the present application, in the step S20, the filling drill holes are arranged at equal intervals at each overlying bench (2) above the mined-out stope, and the interval between the two adjacent filling drill holes is less than or equal to 150m.

[0017] In one example of the present application, in the step S30, the height of the heap is determined according to the trajectory of the waste rock filling machine, so that the distance between the waste rock heap completed by the waste rock filling machine and the roof is less than 0.8m.

[0018] In one example of the present application, the trajectory of the waste rock filling machine includes the farthest throwing distance S and the waste rock height h s , and the expression is as follows:

[0019]

[0020] In the formula, h is the height of the heap after the waste rock filling machine is completed, c is the safety distance of the waste rock filling machine, taken as 1.5m, θ is the throwing angle of the waste rock filling machine, generally 13-25°, v is the throwing speed, generally 2.5-10m / s, and h pH is the height of the platform for throwing gangue, and g is the acceleration of gravity.

[0021] In one example of the present application, in the step S30, a retaining wall is used to close the entrance of the mining tunnel, and a ventilation hole is arranged on the retaining wall to communicate with the outside.

[0022] In one example of the present application, in the step S40, whether the paste filling material is full in the mining tunnel is judged according to the grouting pressure and the observation of the slurry level through the ventilation hole on the retaining wall.

[0023] Another object of the present application is to provide an open-pit coal mine side-hill pressure coal coordinated filling mining method and system.

[0024] The mining parameter design unit is configured to investigate the geological conditions of the side-hill pressure coal resources of the open-pit coal mine, design the mining parameters of the side-hill mining tunnel, and sequentially number them, wherein the mining parameters include width, length and inclination angle;

[0025] The mining tunnel mining unit is configured to use the side-hill mining equipment to mine the plurality of mining tunnels according to the preset parameters and the specified mining method, and arrange the filling drill holes at intervals above each overburden step of the mining tunnel;

[0026] The first mining tunnel filling unit is configured to use the gangue throwing filling machine to throw and fill the overburden step stripping waste gangue of the open-pit coal mine into the mined mining tunnel to form a heap, and close the entrance of the mining tunnel after the completion of the heap;

[0027] The second mining tunnel filling unit is configured to inject the paste filling material into the mining tunnel through the filling drill hole until the drill hole is closed after being filled, and repeat the filling of the next mined side-hill mining tunnel.

[0028] The present application has the advantages that: the present application mines the side-hill pressure coal resources of the open-pit coal mine by interval mining tunnel cyclic filling, without leaving coal pillars in the middle, which has strong ability to resist the overburden load and blasting power and high safety. And a large amount of side-hill stripping waste rock is consumed by gangue solid filling, and the paste filling improves the roof contact rate, which comprehensively combines the advantages of solid filling mining and paste filling mining, reduces the gangue crushing processing amount, and improves the filling efficiency. It realizes the harmonious win-win of mine solid waste disposal and resource recycling, improves the overall stripping ratio of the open-pit coal mine, and has high economic benefits.

[0029] The most preferred embodiments of the present application will be described in more detail below with reference to the accompanying drawings, so that the features and advantages of the present application can be easily understood. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings of the embodiments of the present application will be briefly introduced below. Among them, the drawings are only used to show some embodiments of the present application, and not to limit all embodiments of the present application to this.

[0031] Figure 1 Flow chart of the open coal mine side slope pressure coal cooperative filling mining method according to the embodiment of the present application;

[0032] Figure 2 Schematic diagram of the open coal mine side slope pressure coal cooperative filling mining section according to the embodiment of the present application;

[0033] Figure 3 For Figure 1 Local enlarged view at I;

[0034] Figure 4 Schematic diagram of the open coal mine side slope pressure coal interval mining and cyclic filling mining according to the embodiment of the present application.

[0035] List of reference signs:

[0036] Mining tunnel 1;

[0037] Overlying bench 2;

[0038] Belt conveyor 3;

[0039] Rock dumping and filling machine 4;

[0040] Heap 5;

[0041] Filling borehole 6;

[0042] Paste filling material 7;

[0043] Retaining wall 8;

[0044] 1# Mining tunnel 9;

[0045] 2# Mining tunnel 10;

[0046] 3# Mining tunnel 11;

[0047] 4# Mining tunnel 12;

[0048] 5# Mining tunnel 13;

[0049] 6# Mining tunnel 14;

[0050] 7# Mining tunnel 15;

[0051] 8# Mining tunnel 16;

[0052] Mining tunnel entrance 17;

[0053] Mining tunnel width D. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solutions and advantages of the technical solutions of the present application clearer, the technical solutions of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings of specific embodiments of the present application. The same reference signs in the drawings represent the same parts. It should be noted that the described embodiments are part of the embodiments of the present application, not all. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application.

[0055] Unless otherwise defined, the technical terms or scientific terms used herein should be understood as the usual meaning understood by those skilled in the art to which the present application belongs. The "first", "second" and similar words used in the patent application description and claims of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. Similarly, "one" or "a" and similar words do not necessarily represent a quantity limit. "Include" or "contain" and similar words mean that the elements or objects before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connected" or "connected" and similar words are not limited to physical or mechanical connection, but can include electrical connection, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to represent relative positional relationship, which may change accordingly when the absolute position of the described object changes.

[0056] According to the open-pit coal mine side-hill pressure coal coordinated filling mining method of the first aspect of the present application, as shown in Figures 1 to 4 The method comprises the following steps:

[0057] S10: Investigate the geological conditions of the open-pit coal mine side-hill pressure coal resources, design the mining parameters of the side-hill mining chamber 1, and number in order, wherein the mining parameters include width, length and inclination;

[0058] S20: Use the side-hill coal mining equipment to mine the plurality of mining chambers 1 according to the preset parameters and the specified mining method, and interval arrange the filling drill holes 6 at each overlying bench 2 above the mining chambers 1;

[0059] S30: Use the gangue throwing and filling machine 4 to throw and fill the waste gangue stripped from the overlying bench 2 of the open-pit coal mine into the mined mining chamber 1 to form a heap 5, and close the entrance of the mining chamber 1 after the completion of the heap 5; for example, the belt conveyor 3 is connected with the gangue throwing and filling machine 4, which is used to convey the gangue conveyed by the belt conveyor 3 to the gangue throwing and filling machine 4, and throw it to form a heap 5; it should be noted that, Figure 2 The arrow direction in the mining chamber 1 is the moving direction of the gangue throwing and filling machine 4.

[0060] S40: filling the paste filling material 7 into the mined-out chamber 1 through the filling drill hole 6 until the drill hole is closed after being filled, and repeating the filling of the next mined-out chamber 1.

[0061] The mining method cyclically mines and fills the strip coal resources of the open-pit coal mine by the interval mined-out chambers 1, without leaving a coal pillar in the middle, and has strong resistance to the overlying load and blasting power and high safety. The method consumes a large amount of waste rock in the waste rock dumping and solid filling, improves the roof contact ratio by paste filling, and comprehensively has the advantages of solid filling mining and paste filling mining, reduces the amount of waste rock crushing and processing, and improves the filling efficiency. The method realizes the harmonious win-win of mine solid waste disposal and resource recycling, improves the overall stripping ratio of the open-pit coal mine, and has high economic benefits.

[0062] In an example of the present application, as shown in Figure 2 In the step S10, the width of the mined-out chamber 1 is determined by the strip mining equipment and the stability of the overlying bench 2, and the width of the mined-out chamber 1 is kept at 3m-6m; the length of the mined-out chamber 1 is determined by the boundary range of the open-pit mine, and the length of the mined-out chamber 1 is not suitable to be more than 400m, and the inclination angle of the mined-out chamber 1 should be downward, and the angle is 0-10°.

[0063] In an example of the present application, as shown in Figure 4 In the step S20, the designated mining method of the plurality of mined-out chambers 1 is that: after sequentially mining the previous mined-out chamber 1, the next mined-out chamber 1 is mined at an interval of an integral multiple of the width of the mined-out chamber 1.

[0064] The interval between the two mined-out chambers 1 mined in front and back is an integral multiple of the width of the mined-out chamber 1, which is to prevent the influence of the unfilled roof-contacted mined-out chamber 1; in this way, the mined-out chamber can be mined in the elastic zone range to avoid the stress concentration zone, and the safety is high.

[0065] In an example of the present application, the calculation expression of mining the next mined-out chamber 1 at an interval of an integral multiple of the width of the mined-out chamber 1 is:

[0066]

[0067] In the formula: [N] is the integral multiple of the width of the mined-out chamber 1, and is automatically rounded; Q is the width of the plastic zone of the coal pillar, d is the width of the mined-out chamber 1, H is the height of the coal body, γ is the unit weight of the overlying rock mass, k is the peak pressure coefficient, and is taken as 2.5, is the internal friction angle of the coal body, and c is the cohesion of the coal body.

[0068] In an example of the present application, in the step S20, the filling drill holes 6 are arranged at equal intervals at each overlying bench 2 above the mined-out chamber 1, and the interval between the two adjacent filling drill holes 6 is less than or equal to 150m.

[0069] The arrangement of the filling drill holes 6 at equal intervals is determined by the flow performance of the paste filling material 7; the flow diffusion diameter of the paste filling material 7 is greater than or equal to the interval of the drill holes, so that the slurry can completely cover the area above the mining chamber 1 which is not connected to the roof, without leaving a gap.

[0070] In one example of the present application, as shown in the step S30, the height of the heap 5 is determined according to the trajectory of the waste rock throwing filling machine 4, so that the distance between the waste rock heap 5 and the roof is less than 0.8 m. Figure 3

[0071] Since the waste rock cannot be connected to the roof, considering the angle of the waste rock filling body and safety, the 0.8 m range of the top is reserved to ensure the smooth operation of the waste rock operation, and the subsequent paste filling slurry can seal this space.

[0072] In one example of the present application, the trajectory of the waste rock throwing filling machine 4 includes the farthest throwing distance S and the waste rock height h s , and the expression is as follows:

[0073]

[0074] In the formula, h is the height of the heap 5 after the waste rock throwing filling machine 4 is completed, c is the safety distance of the waste rock throwing filling machine 4, which is 1.5 m, θ is the angle of the waste rock throwing filling machine 4, which is generally 13-25°, v is the throwing speed, which is generally 2.5-10 m / s, h p is the height of the waste rock platform, and g is the acceleration of gravity.

[0075] In one example of the present application, in the step S30, a retaining wall 8 is used to close the entrance of the mining chamber 1, and a ventilation hole is arranged on the retaining wall 8 to communicate with the outside;

[0076] The ventilation hole can be used for ventilation and observation of the filling condition of the mining chamber 1;

[0077] For example, the retaining wall 8 can be a cement wall;

[0078] It should be noted that the material of the retaining wall 8 is not specified, as long as the mining chamber 1 has a closed effect.

[0079] In one example of the present application, in the step S40, whether the paste filling material 7 is full in the mining chamber 1 is determined according to the grouting pressure and the observation of the slurry level through the ventilation hole on the retaining wall 8;

[0080] Specifically, first, the grouting pressure of the drill hole is increased, indicating that the gap in the mining chamber is basically full, and then the distribution of the slurry is observed through the ventilation hole on the retaining wall to determine the injection condition of the paste filling material.

[0081] ​The mining system of the open-pit coal mine side-hill pressure coal coordinated filling mining method according to the second aspect of the present application, comprising:

[0082] A mining parameter design unit is configured to investigate the geological conditions of the open-pit coal mine side-hill pressure coal resources, design the mining parameters of the side-hill mining chamber 1, and sequentially number them, wherein the mining parameters include width, length, and inclination;

[0083] A mining chamber mining unit is configured to use the side-hill mining equipment to mine the multiple mining chambers 1 according to the preset parameters and the specified mining method, and arrange the filling drill holes 6 at the intervals of the overlying benches 2 above the mining chambers 1;

[0084] A first mining chamber filling unit is configured to use the gangue throwing filling machine 4 to throw the waste gangue stripped from the overlying benches 2 of the open-pit coal mine into the mined mining chambers 1 to form the heap 5, and close the mining chamber entrance 17 after the completion of the heap 5;

[0085] A second mining chamber filling unit is configured to inject the paste filling material 7 into the mining chambers 1 through the filling drill holes 6 until the drill holes are closed after being filled, and repeat the filling of the next mined side-hill mining chamber 1.

[0086] The mining method cyclically mines the open-pit coal mine side-hill pressure coal resources through the interval mining chambers 1, without leaving coal pillars in the middle, has strong ability to resist the overlying load and blasting power, and is high in safety. The method consumes a large amount of side-hill stripped waste rock through solid filling by gangue throwing, improves the roof contact ratio through paste filling grouting, and comprehensively has the advantages of solid filling mining and paste filling mining, reduces the gangue crushing processing amount, and improves the filling efficiency. The method realizes the harmonious win-win of mine solid waste disposal and resource recycling, improves the overall stripping ratio of the open-pit coal mine, and has high economic benefits.

[0087] Particular cases

[0088] The average thickness of the No. 11 coal seam in the southern side-hill of a certain open-pit mine is 4.47 m, the overlying rock layer is in the opposite direction, has good stability, and the mineable range area is about 182,000 m 2 , the east-west length is about 1.6 km, and the north-south length is about 200 m. When the mining direction of the open-pit mine in this area is changed from north to south to east to west, the east side-hill will be internally discharged, causing permanent loss of the southern side-hill pressure coal resources, which needs to be mined by a side-hill coal mining method. The specific steps are as follows:

[0089] First step: According to the investigation, the existing intelligent safety mining complete equipment of the side slope coal has a mining width of 3.3 m, and a suitable downward inclination angle of 0-7°. Combined with the mining experience of similar geological conditions in the mining area, when the width of the side slope filling mining tunnel 1 is 3.3 m, the roof can remain stable without support. The width of the mining tunnel 1 is determined to be 3.3 m and the length is 320 m, and the mining tunnels are numbered in sequence as 1# mining tunnel 9, 2# mining tunnel 10, 3# mining tunnel 11, …, 8#.

[0090] Second step: The side slope coal mining equipment is used to mine the 1# mining tunnel 9. After the mining is completed, one drilling hole is arranged every 100 m on the overlying bench 2, a total of three paste grouting drilling holes are arranged. According to the calculation result of the calculation expression of the interval mining tunnel width D multiple, the interval mining tunnel width D multiple is 3 times, that is, after the 1# mining tunnel 9 is mined, the 5# mining tunnel 13 can be mined, and the mining sequence is 1# mining tunnel 9→5# mining tunnel 13→2# mining tunnel 10→6# mining tunnel 14→3# mining tunnel 11→7# mining tunnel 15→4# mining tunnel 12→8# mining tunnel 16.

[0091] Third step: The belt conveyor 3 and the gangue throwing and filling machine 4 are used to fill the waste gangue of the overlying bench 2 of the open-pit coal mine to the mined 1# mining tunnel 9. The inclination angle of the gangue throwing and filling machine 4 is 20°, the throwing speed is 8 m / s, and the throwing distance is 8 m. According to formula (2), the height of the pile 5 is 3.74 m, the distance from the roof is 730 mm, the filling rate is 83%, the gangue filling pile 5 is formed, and after the 1# mining tunnel 9 is filled with gangue, the mining tunnel entrance 17 is closed by the retaining wall 8.

[0092] Fourth step: The waste rock stripped from the side slope is crushed and processed to form a paste filling material slurry, which is transported into the 1# mining tunnel 9 through the vertically arranged drilling hole until the drilling hole is filled and closed, and the filling operation is completed. According to the second step, the third step, and the fourth step, the mining and filling are cycled until the resources in the area are recovered, and the filling operation lags behind the mining operation.

[0093] The paste filling material slurry used in this embodiment has a mass concentration of 78%, and the gangue:cement:fly ash ratio is 72:8:20. The gangue particle size is less than 10 mm, and the 28d strength can reach 5 MPa. By using this method and system, the open-pit mine consumes about 500,000 t / a of waste rock stripped from the side slope, of which only 150,000 t / a of broken gangue is needed for paste filling materials. The remaining consumed gangue can be directly transported and thrown into the mining tunnel, reducing the transportation pressure of the internal and external dumping sites, the amount of broken processing, and the power consumption. At the same time, the paste filling grouting improves the roof contact rate of the mining tunnel, and the roof contact rate can reach more than 90%. The advantages of solid filling mining and paste filling mining are combined, and compared with single filling mining method, the filling coal mining efficiency is higher, the annual output is 463,800 t / a, and the economic benefit is better.

[0094] The open-pit coal mine side slope pressure coal coordinated filling mining method and system proposed by the present application are described in detail above with reference to the preferred embodiments, however, it can be understood by those skilled in the art that various modifications and changes can be made to the above specific embodiments without departing from the concept of the present application, and various technical features and structures proposed by the present application can be combined without exceeding the protection scope of the present application, and the protection scope of the present application is determined by the appended claims.

Claims

1. A method for open-pit coal mine side-hill pressure coal coordinated backfill mining, characterized in that, Comprising the following steps: Step S10: Investigate the geological conditions of the coal resources under the slope of the open-pit coal mine, design the mining parameters of the slope mining tunnel (1), and number them in order, wherein the mining parameters include width, length and inclination; Step S20: Use the slope mining equipment to mine multiple mining tunnels (1) according to the preset parameters and the specified mining method, and interval arrange filling drill holes (6) at each overlying step (2) above the mining tunnel (1); Step S30: Use the waste rock filling machine (4) to throw and fill the waste rock of the overlying step (2) of the open-pit coal mine into the mined mining tunnel (1) to form a heap (5), and close the mining tunnel entrance (17) after completing the heap (5); wherein the specified mining method of the multiple mining tunnels (1) is: after sequentially mining the last mining tunnel (1), the next mining tunnel (1) is mined at an interval of an integer multiple of the width (D) of the mining tunnel, without leaving a coal pillar in between; the calculation expression for mining the next mining tunnel (1) at an interval of an integer multiple of the width (D) of the mining tunnel is: In the formula: N is the multiple of the width of the mining tunnel (D) and is automatically rounded off; Q is the width of the plastic zone of the coal pillar, d is the width of the mining tunnel (D), H is the height of the coal body, γ is the unit weight of the overlying rock mass, k is the peak pressure coefficient, taken as 2.5, is the internal friction angle of the coal body, C is the cohesion of the coal body, λ is the lateral pressure coefficient; Step S40: Inject the paste filling material (7) into the mining tunnel (1) through the filling drill hole (6), close the drill hole after filling, and repeat the filling of the next mined slope mining tunnel (1).

2. The open-pit coal mine slope coal cooperative filling mining method according to claim 1, characterized in that, In the step S10, the width of the mining tunnel (1) is determined by the slope mining equipment and the stability of the overlying step (2), and the width of the mining tunnel (1) is kept at 3m-6m; the length of the mining tunnel (1) is determined by the boundary range of the open-pit mine, and the length of the mining tunnel (1) should not exceed 400m, and the inclination of the mining tunnel (1) should be downward, with an angle of 0-10°.

3. The open-pit coal mine slope coal cooperative filling mining method according to claim 1, characterized in that, In the step S20, the filling drill holes (6) are arranged at equal intervals at each overlying step (2) above the mining tunnel (1), and the interval between two adjacent filling drill holes (6) is less than or equal to 150m.

4. The open-pit coal mine slope coal cooperative filling mining method according to claim 1, characterized in that, In the step S30, the height of the heap (5) is determined according to the trajectory of the waste rock filling machine (4), so that the distance between the waste rock heap (5) and the roof completed by the waste rock filling machine (4) is less than 0.8m.

5. The open-pit coal mine slope coal cooperative filling mining method according to claim 1, characterized in that, In the step S30, the mining tunnel entrance (17) is closed by a retaining wall (8), and a ventilation hole connected to the outside is provided on the retaining wall (8).

6. The open-pit coal mine slope coal cooperative filling mining method according to claim 5, characterized in that, In the step S40, whether the paste filling material (7) is filled in the mining tunnel (1) is determined by the grouting pressure and the observation of the slurry level through the ventilation hole on the retaining wall (8).

7. A mining system for the open cut coal mine gateroad coal seam simultaneous extraction and backfilling method as claimed in any one of claims 1 to 6, characterised in that, Comprising: A mining parameter design unit configured to investigate the geological conditions of the coal resources under the slope of the open-pit coal mine, design the mining parameters of the slope mining tunnel (1), and number them in order, wherein the mining parameters include width, length and inclination; The mining tunnel mining unit is configured to use the side slope coal mining equipment to mine a plurality of mining tunnels (1) according to preset parameters and a specified mining method, and to arrange filling drill holes (6) at intervals at each overlying step (2) above the mining tunnels (1); The first mining tunnel filling unit is configured to use the waste rock throwing filling machine (4) to throw and fill the waste rock stripped from the overlying step (2) of the open-pit coal mine into the mined mining tunnel (1) to form a heap (5), and to close the mining tunnel entrance (17) after the completion of the heap (5); wherein the specified mining method of the plurality of mining tunnels (1) is to mine the next mining tunnel (1) at intervals of an integral multiple of the mining tunnel width (D) after sequentially mining the previous mining tunnel (1) in order, without leaving a coal pillar in between; the calculation expression for mining the next mining tunnel (1) at intervals of an integral multiple of the mining tunnel width (D) is: In the formula: N is the multiple of the width of the mining chamber (D) and is automatically rounded off; Q is the width of the plastic zone of the coal pillar, d is the width of the mining chamber (D), H is the height of the coal body, γ is the unit weight of the overlying rock mass, k is the peak pressure coefficient, taken as 2.5, is the internal friction angle of the coal body, C is the cohesion of the coal body, λ is the lateral pressure coefficient; The second mining tunnel filling unit is configured to inject the paste filling material (7) into the mining tunnel (1) through the filling drill hole (6), close the drill hole after filling, and repeat the filling of the next mined side slope mining tunnel (1).

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