Non-equilibrium strip mine parallel mining area steering method

Abstract

The invention discloses a non-equilibrium strip mine parallel mining area steering method. The method comprises the four steps of through working line construction, fan-shaped opposite advancing, dumping follow-up and working line segmented recovery. The stripping working line of the new mining area and the old mining area propelled in the fan-shaped mode stretches across the new mining area and the old mining area, the coal seam depths of all points on the stripping working line are different, the stripping ratios are different, and the stripping ratios can be effectively balanced through synchronous opposite fan-shaped mining; the advancing speeds of all points on the stripping working line are different, the equipment capacity can be effectively distributed, and the management difficulty is reduced; the stripping working line of the fan-shaped propulsion new mining area produces more coal, while the stripping working line of the old mining area produces less coal, and the synchronous mining keeps the overall coal yield of the mine; the two mining areas are synchronously involved in the mining process of the stripping working lines of the new mining area and the old mining area which are propelled in a fan-shaped mode, the contradiction between the inner drainage space and the stripping amount caused by a traditional mining sequence is solved, and the inner drainage space is balanced.

Description

Technical Field

[0001] The invention relates to a method for turning a mining area in an open-pit mine, and in particular to a method for turning a parallel mining area in a non-balanced open-pit mine. Background Art

[0002] Hillside open-pit mines or inclined coal seam open-pit mines have different coal seam depths in different areas and different mining difficulties. Therefore, at the beginning of the design, in order to achieve production as soon as possible and reduce the cost of the construction stage, most of them adopt a phased and zoned mining sequence of shallow first and deep later, easy first and difficult later, that is, a trench is dug in the shallow coal seam to form a working face, shallow coal is mined first, and then gradually advances to the deep, and the mining difficulty increases from easy to difficult. Although this scheme can reduce the initial investment in the mine, in the process of advancing to the deep, under the premise of maintaining production, two types of imbalances will occur. One is the staged imbalance of the stripping ratio. The stripping ratio is small when mining the shallow part, and the stripping ratio is large when mining the deep part. The second is the imbalance of mining and drainage space. In the process from shallow to deep, the space of the shallow goaf is small and the internal drainage capacity is small, while the deep stripping volume gradually increases at this time, and the stripping material produced has nowhere to be discharged. The above two types of imbalances correspond to the non-balanced open-pit mines described in the present invention.

[0003] Unbalanced open-pit mines will have many problems during the imbalance period, such as insufficient disposal space, unstable mine output, equipment capacity unable to meet mining and stripping needs, and increased difficulty in production management. Especially during the turning period of open-pit mines, the large-scale change in mining direction in a short period of time will further aggravate the above two types of imbalance problems and have a serious impact on mine production. Summary of the invention

[0004] In view of the problems existing in the above-mentioned prior art, the present invention provides a non-balanced open-pit mine parallel mining area steering method, which can effectively balance the stripping ratio, maintain the overall coal production of the mine, and balance the internal drainage space.

[0005] To achieve the above object, the present invention provides the following technical solutions: a non-equilibrium open-pit mine parallel mining area steering method, including four steps of building a through working line, fan-shaped opposite advancement, soil discharge follow-up and working line segmented recovery; Construction of a through work line: The range of the old mining area that is several years away from the bottom boundary of the old mining area is divided into a turning area, the intersection of the turning area boundary and the outer boundary of the old mining area is the rotation center of the old mining area, and the intersection of the bottom boundary of the new mining area and the outer boundary of the new mining area is the rotation center of the new mining area; when the stripping work line advances to the boundary of the turning area, the stripping work line takes the rotation center of the old mining area as the center of the fan and then turns to a fan-shaped advancement, and the coal mining work line below the stripping work line follows the advancement; when the stripping work line is fan-shaped and the line connecting the rotation center of the old mining area and the rotation center of the new mining area coincides, the stripping work line begins to extend to the rotation center of the new mining area and finally connects with it. At this time, the stripping work line connects the rotation center of the old mining area and the rotation center of the new mining area, and the construction of the through work line is completed; Fan-shaped counter-propulsion: After the construction of the through working line is completed, the stripping working line will be fan-shaped with the rotation center of the new mining area and the rotation center of the old mining area as the center of the fan respectively. The stripping working line of the new mining area is fan-shaped with the rotation center of the new mining area as the center of the fan, and the stripping working line of the old mining area is fan-shaped with the rotation center of the old mining area as the center of the fan; the stripping working line of the old mining area is limited to the bottom boundary of the new mining area, the bottom boundary of the old mining area and the outer boundary of the old mining area. When the boundary is touched, the working line will naturally pinch out or stop advancing; the stripping working line of the new mining area is limited to the inner boundary of the new mining area, the boundary of the turning area and the outer boundary of the new mining area. When the boundary is touched, the working line will naturally pinch out or stop advancing; Soil discharge follow-up: During the whole process of building the through working line and the fan-shaped counter-advance, the bottom boundary of the inner dump shall maintain the minimum pit bottom width distance with the bottom boundary of the coal mining working line below the stripping working line of the new mining area and the stripping working line of the old mining area respectively and follow the advancement; Working line segment recovery: When the stripping work line of the new mining area that is continuously advancing in a fan shape touches the boundary of the turning area, the stripping work line of the new mining area naturally tapers out or stops advancing, thereby continuously forming a continuous stripping work line of the new mining area at the boundary of the turning area of ​​the new mining area. When the length of the stripping work line of the new mining area reaches the minimum mineable length, mining equipment is deployed on the work line, and mining work is carried out along the extension direction of the new mining area; as the stripping work line of the new mining area continues to advance in a fan shape, the stripping work line of the new mining area also continues to grow in the new mining area, and finally spans the entire new mining area, thus realizing the turning of the mining area.

[0006] Furthermore, the old mining area is located in a shallow coal seam, and the new mining area is located in a deep coal seam.

[0007] Furthermore, in the fan-shaped opposite advancement step, the coal mining working lines below the stripping working lines in the new mining area and the stripping working lines in the old mining area maintain the minimum mining flat width and follow the corresponding stripping working lines to advance respectively.

[0008] Furthermore, in the dumping follow-up step, the minimum pit bottom width distance between the bottom boundary of the inner dumping area and the bottom boundary of the coal mining working line is 50m.

[0009] Furthermore, in the step of segmented recovery of the working line, the minimum exploitable length of the stripping working line in the new mining area is 50m.

[0010] Furthermore, the mining equipment is continuously added as the length of the stripping working line in the new mining area increases.

[0011] Compared with the prior art, the stripping lines of the new and old mining areas of the fan-shaped advancement of the present invention span the new and old mining areas. The coal seam depths at various points on the stripping lines are different, and the stripping ratios are different. Synchronous opposite fan-shaped mining can effectively balance the stripping ratios; the advancement speeds at various points on the stripping lines are different, which can effectively allocate equipment capacity and reduce management difficulty; the stripping lines of the new mining areas of the fan-shaped advancement produce more coal, while the stripping lines of the old mining areas produce less coal, and synchronous mining maintains the overall coal production of the mine; the mining process of the stripping lines of the new and old mining areas of the fan-shaped advancement involves the two mining areas simultaneously, which solves the contradiction between the internal row space and the stripping amount caused by the traditional mining sequence and balances the internal row space. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of the initial stage of the construction of the through-working line of the present invention; Figure 2 This is a schematic diagram of the coal seam distribution structure of the present invention; Figure 3 This is a schematic diagram of the later stage of the construction of the through-working line of the present invention; Figure 4 It is a schematic diagram of the fan-shaped counter-propulsion and soil discharge follow-up stages of the present invention; Figure 5 It is a schematic diagram of the stage of segmented recovery of the working line of the present invention; In the figure: 1-old mining area; 2-new mining area; 3-coal seam; 4-bottom boundary of old mining area; 5-turning area; 6-stripping working line of old mining area; 7-turning area boundary; 8-outer boundary of old mining area; 9-rotation center of old mining area; 10-coal mining working line; 11-bottom boundary of new mining area; 12-outer boundary of new mining area; 13-rotation center of new mining area; 14-inner boundary of new mining area; 15-inner spoil dump; 16-stripping working line of new mining area. DETAILED DESCRIPTION

[0013] The present invention will be further described below in conjunction with the accompanying drawings.

[0014] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0015] The invention provides a non-equilibrium open-pit mine parallel mining area steering method, comprising four steps of constructing a through working line, fan-shaped opposite advancement, soil discharge follow-up and working line segmented recovery.

[0016] Construction of a through work line: like Figure 2 As shown, the old mining area 1 is located at the shallow coal seam 3, and the new mining area 2 is located at the deep coal seam 3; Figure 1 and Figure 3 As shown, the range of the old mining area 1 that is advanced several years from the bottom boundary 4 of the old mining area is divided into a turning area 5, the intersection of the turning area boundary 7 and the outer boundary 8 of the old mining area is the rotation center 9 of the old mining area, and the intersection of the bottom boundary 11 of the new mining area and the outer boundary 12 of the new mining area is the rotation center 13 of the new mining area.

[0017] When the stripping work line advances to the boundary 7 of the turning area, the stripping work line takes the rotation center 9 of the old mining area as the center of the fan and then turns to advance in a fan shape, and the coal mining work line 10 below the stripping work line follows the advance; when the stripping work line advances in a fan shape to the point where the line connecting the rotation center 9 of the old mining area and the rotation center 13 of the new mining area coincides, the stripping work line begins to extend toward the rotation center 13 of the new mining area and finally connects with it. At this time, the stripping work line connects the rotation center 9 of the old mining area and the rotation center 13 of the new mining area, that is, the construction of the through work line is completed.

[0018] The size of the turning area 5 is determined according to the open-pit mine turning plan. When the open-pit mine has a large production capacity, limited equipment capacity, and a long turning period, the corresponding turning area 5 is also larger. On the contrary, when the enterprise has strict requirements on the turning period, the turning area 5 should be smaller. Generally, the range of the three-year advancement distance from the old mining area 1 to the bottom boundary of the old mining area 4 is divided into the turning area 5.

[0019] Fan-shaped counter-propulsion: like Figure 4 As shown, after the construction of the through working line is completed, the stripping working line rotates and advances in a fan-shaped manner with the new mining area rotation center 13 and the old mining area rotation center 9 as the center of the fan. The new mining area stripping working line 16 is advanced in a fan-shaped manner with the new mining area rotation center 13 as the center of the fan, and the old mining area stripping working line 6 is advanced in a fan-shaped manner with the old mining area rotation center 9 as the center of the fan.

[0020] The far end of the stripping work line 6 of the old mining area starts to advance toward the old mining area 1 from the rotation center 13 of the new mining area, and the coal mining work line 10 below the stripping work line maintains the minimum mining flat width and follows the advancement. During the advancement of the stripping work line 6 of the old mining area, it is limited by the bottom boundary 11 of the new mining area, the bottom boundary 4 of the old mining area and the outer boundary 8 of the old mining area. When the boundary is touched, the work line naturally tapers out or stops advancing.

[0021] The far end of the stripping work line 16 of the new mining area starts to advance from the internal boundary 14 of the new mining area to the new mining area 2, and the coal mining work line 10 below the stripping work line maintains the minimum mining flat width and follows the advancement. During the advancement of the stripping work line 16 of the new mining area, it is limited by the internal boundary 14 of the new mining area, the boundary 7 of the turning area and the external boundary 12 of the new mining area. When touching the boundary, the work line naturally tapers out or stops advancing.

[0022] Soil discharge follow-up: like Figure 4 As shown, during the entire process of building the through working line and fan-shaped opposite advancement, the bottom boundary of the inner spoil dump 15 maintains the minimum pit bottom width distance from the bottom boundary of the coal mining working line 10 below the new mining area stripping working line 16 and the old mining area stripping working line 6, and follows the advancement, which is generally 50m.

[0023] The fan-shaped center of the old mining area 1, that is, the center of the rotational advancement, is located in the shallower part of the coal seam 3, and the fan-shaped center of the new mining area 2 is located in the deeper part of the coal seam 3; as for the stripping work line 6 of the old mining area of ​​fan-shaped advancement, the stripping ratio at its proximal end, that is, close to the center of the circle, is small, while the stripping ratio near the distal end is large, and the overall stripping ratio is balanced. At the same time, the advancement is slow near the center of the circle, and the equipment demand is small, while the advancement is fast near the distal end, and the equipment demand is large, and the overall equipment demand is balanced.

[0024] As for the stripping work line 16 of the new mining area advanced in a fan shape, the stripping ratio at the near end, that is, close to the center of the circle, is large, while the stripping ratio near the far end is small, and the overall stripping ratio is balanced. At the same time, the advancement is slow near the center of the circle, and the equipment demand is small, while the advancement is fast near the far end, and the equipment demand is large, and the overall equipment demand is balanced.

[0025] In terms of the distribution of mining equipment, the equipment on the fan-shaped new mining area stripping line 16 and the old mining area stripping line 6 are all concentrated at the far end of the work line, avoiding the problem of equipment on the two work lines being concentrated on the local traffic line and reducing management difficulty.

[0026] When the thickness of the coal seam 3 does not change much, the outer end of the stripping line 16 in the new mining area advances rapidly and can produce a large amount of coal, while the outer end of the stripping line 6 in the old mining area strips a large amount and advances slowly, and the coal production of the entire line is small. The coal production of the two lines is balanced, maintaining the overall coal production of the mine.

[0027] In terms of drainage space, the coal seam 3 in the new mining area 2 is deep, so the internal drainage space after mining is large, while the coal seam 3 in the old mining area 1 is shallow, so the internal drainage space after mining is insufficient. The mining process of the stripping line 16 in the new mining area and the stripping line 6 in the old mining area in fan-shaped advancement involves both the new and old mining areas, which solves the contradiction between the internal drainage space and the stripping volume caused by the traditional mining sequence and balances the internal drainage space.

[0028] Working line segment recovery: like Figure 5 As shown, when the continuously fan-shaped stripping work line 16 of the new mining area touches the boundary 7 of the turning area, the stripping work line 16 of the new mining area naturally tapers out or stops advancing, thereby continuously forming a continuous stripping work line 16 of the new mining area perpendicular to the internal boundary 14 of the new mining area at the position of the boundary 7 of the turning area of ​​the new mining area 2. When the length of the stripping work line 16 of the new mining area reaches the minimum exploitable length, which is generally 50m, mining equipment is deployed on the work line, and mining work is carried out along the extension direction of the new mining area 2.

[0029] As the stripping line 16 of the new mining area continues to advance in a fan shape, it also continues to grow in the new mining area 2. Correspondingly, mining equipment is also continuously added as the length of the stripping line 16 of the new mining area increases, and eventually spans the entire new mining area 2. At this time, the advancement direction of the stripping line 16 of the new mining area is 180° to the advancement direction of the stripping line 6 of the old mining area before the old mining area 1 turned, thereby realizing the mining area turning.

[0030] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any slight modification, equivalent substitution and improvement made to the above embodiment based on the technical essence of the present invention should be included in the protection scope of the technical solution of the present invention.

Claims

1. A method for turning parallel mining areas in a non-balanced open-pit mine, characterized in that: It includes four steps: building a through working line, advancing in a fan-shaped direction, following up with earth discharge, and restoring the working line in sections. Construction of a through work line: The range of the old mining area (1) that is advanced several years from the bottom boundary (4) of the old mining area is divided into a turning area (5), the intersection of the turning area boundary (7) and the outer boundary (8) of the old mining area is the rotation center (9) of the old mining area, and the intersection of the bottom boundary (11) of the new mining area and the outer boundary (12) of the new mining area is the rotation center (13) of the new mining area; When the stripping line advances to the boundary of the turning area (7), the stripping line takes the rotation center (9) of the old mining area as the center of the fan and then advances in a fan shape, and the coal mining line (10) below the stripping line follows the advance; when the stripping line advances in a fan shape until the line connecting the rotation center (9) of the old mining area and the rotation center (13) of the new mining area coincides, the stripping line begins to extend toward the rotation center (13) of the new mining area and finally connects with it. At this time, the stripping line connects the rotation center (9) of the old mining area and the rotation center (13) of the new mining area, and the construction of the through work line is completed; Fan-shaped counter-propulsion: After the construction of the through working line is completed, the stripping working line is fan-shaped with the rotation center of the new mining area (13) and the rotation center of the old mining area (9) as the center of the fan-shaped circle. The stripping working line (16) of the new mining area is fan-shaped with the rotation center of the new mining area (13) as the center of the fan-shaped circle, and the stripping working line (6) of the old mining area is fan-shaped with the rotation center of the old mining area (9) as the center of the fan-shaped circle. The stripping working line (6) of the old mining area is limited to the bottom boundary (11) of the new mining area, the bottom boundary (4) of the old mining area and the outer boundary (8) of the old mining area. When the boundary is touched, the working line will naturally taper out or stop advancing. The stripping working line (16) of the new mining area is limited to the inner boundary (14) of the new mining area, the boundary of the turning area (7) and the outer boundary (12) of the new mining area. When the boundary is touched, the working line will naturally taper out or stop advancing. Soil discharge follow-up: During the whole process of constructing the through working line and the fan-shaped counter-advancement, the bottom boundary of the inner spoil dump (15) maintains the minimum pit bottom width distance with the bottom boundary of the coal mining working line (10) below the new mining area stripping working line (16) and the old mining area stripping working line (6) and follows the advancement; Working line segment recovery: When the continuously fan-shaped new mining area stripping work line (16) touches the turning area boundary (7), the new mining area stripping work line (16) naturally tapers out or stops advancing, thereby continuously forming a continuous new mining area stripping work line (16) at the turning area boundary (7) of the new mining area (2). When the length of the new mining area stripping work line (16) reaches the minimum exploitable length, mining equipment is deployed on the work line, and mining work is carried out along the extension direction of the new mining area (2); As the stripping line (16) of the new mining area continues to advance in a fan-shaped manner, the stripping line (16) of the new mining area also continues to grow in the new mining area (2), and eventually spans the entire new mining area (2), thereby realizing the mining area turning.

2. A non-balanced open-pit mine parallel mining area steering method according to claim 1, characterized in that: The old mining area (1) is located in a shallow coal seam (3), and the new mining area (2) is located in a deep coal seam (3).

3. A non-balanced open-pit mine parallel mining area steering method according to claim 1, characterized in that: In the fan-shaped opposite advancement step, the coal mining working line (10) below the new mining area stripping working line (16) and the old mining area stripping working line (6) maintains a minimum mining flat plate width and follows the corresponding stripping working line to advance.

4. The method for turning parallel mining areas in a non-balanced open-pit mine according to claim 1, characterized in that: In the dumping follow-up step, the minimum pit bottom width distance between the bottom boundary of the inner dumping field (15) and the bottom boundary of the coal mining working line (10) is 50m.

5. The method for turning parallel mining areas in a non-balanced open-pit mine according to claim 1, characterized in that: In the step of recovering the working line in sections, the minimum exploitable length of the stripping working line (16) in the new mining area is 50 m.

6. A non-balanced open-pit mine parallel mining area steering method according to claim 5, characterized in that: The mining equipment is continuously added as the length of the stripping working line (16) in the new mining area increases.

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