A method and system for setting a space for preparing and arranging a combined bench in a seasonal stripping open-pit mine

Abstract

The application provides a method and system for reserving space for combined bench preparation and arrangement of a seasonal stripping open pit mine. The method comprises: based on the constructed stripping amount model of the ore rock of the stope, calculating the stripping amount of the ore rock of the current stripping period of the open pit mine to determine the preparation and arrangement boundary flat of the combined bench of the open pit mine; and sequentially circulating the stripping amount of the ore rock of the current stripping period of the open pit mine to the inner arrangement bench below the preparation and arrangement boundary flat of the dump to form a circulating pushing arrangement mode of the combined bench composed of one standard inner arrangement bench and one inner arrangement bench shortened to the minimum working flat width. In this way, the inner arrangement amount below the preparation and arrangement boundary flat is effectively increased, the problem of mine production stagnation caused by the interruption of the arrangement connection due to the reasons such as advanced stripping and insufficient arrangement space is avoided, and the economic benefit is significantly improved; the bench above the preparation and arrangement boundary flat is reserved as the preparation and arrangement space, and the connection development of the stope and the inner dump is effectively ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mining, in particular to a method and system for setting up a combined bench space for a seasonal stripping open-pit mine. BACKGROUND

[0002] In the field of coal mining, an open-pit mine defined as seasonal operation is referred to as a seasonal stripping open-pit mine. For these seasonal stripping open-pit mines, in the process of mining, there is frozen soil in winter due to cold weather, which makes stripping difficult to proceed normally. Therefore, in order to effectively avoid the adverse stripping construction conditions in winter and reduce production costs, most of the coal mining projects of such open-pit mines are real-time seasonal operation, that is, the stripping project is concentrated in spring and summer, and the coal mining project is concentrated in autumn and winter. This kind of advanced stripping will lead to unbalanced release of the space for dumping soil in a period of time, thereby causing difficulties in the connection of mining, transportation and dumping. Therefore, there is an urgent need to provide a technical solution to the above-mentioned problems of the prior art. SUMMARY

[0003] The purpose of the present application is to provide a method and system for setting up a combined bench space for a seasonal stripping open-pit mine, so as to solve or alleviate the problems existing in the prior art.

[0004] In order to achieve the above-mentioned purpose, the present application provides the following technical solution:

[0005] The present application provides a method for setting up a combined bench space for a seasonal stripping open-pit mine, comprising the following steps: step S101, calculating the stripping amount of ore and rock of the current stripping period of the open-pit mine based on the constructed stripping amount model of the ore and rock of the mining field; step S102, determining the dumping and stockpiling boundary flat of the open-pit mine according to the stripping amount of ore and rock of the current stripping period of the open-pit mine; step S103, sequentially and cyclically dumping the stripping amount of ore and rock of the current stripping period of the open-pit mine to the inner dumping bench below the dumping and stockpiling boundary flat of the inner dumping field to form an initial form of the combined bench space of the inner dumping field; wherein the combined bench is composed of one standard inner dumping bench and one inner dumping bench shortened to the minimum working flat width; step S104, dumping the stripping amount of the current mining field to the combined bench below the dumping and stockpiling boundary flat, at this time, the dumping and stockpiling boundary flat reaches the maximum width, the stripping amount of the next year's stripping period is dumped to a position above the dumping and stockpiling boundary flat, and the dumping and stockpiling boundary flat returns to the initial width.

[0006] Preferably, in step S101, the stripping amount model of the ore and rock of the mining field is based on:

[0007] V 采 = B x H 采场 x (L (j) + H 采场 / tan β)

[0008] determining the stripping amount V of ore and rock of the current stripping period of the open-pit mine采 ; wherein B is the advancing degree of the inner dump, H 采场 is the height of the pit of the open-pit mine, L (j) is the length of the working line at the pit bottom of the open-pit mine; and β is the toe of the end slope of the pit of the open-pit mine.

[0009] Preferably, in the pit area of the open-pit mine, according to the known elevation of the top of the uppermost coal layer, the height difference H1 between the top of the uppermost coal layer and the pit bottom of the open-pit mine is obtained, and the height difference H2 between the ground surface of the open-pit mine and the top of the uppermost coal layer is obtained; the height difference H1 between the top of the uppermost coal layer and the pit bottom of the open-pit mine and the height difference H2 between the ground surface of the open-pit mine and the top of the uppermost coal layer are summed to obtain the height of the pit of the open-pit mine.

[0010] Preferably, in step S102, the formula is:

[0011]

[0012] the height H3 of the boundary line of the inner dump is calculated;

[0013] the inner dump flat closest to the height H3 of the boundary line is determined as the boundary flat of the open-pit mine;

[0014] wherein V 弃 is the dumping amount of the current stripping period of the open-pit mine, λ is the loose coefficient of the pit of the open-pit mine, V 采 is the stripping amount of the ore and rock of the pit of the open-pit mine, B is the advancing degree of the inner dump; a is the number of groups of the combined steps in the inner dump; L is the width of the dumping flat of the inner dump; B min is the minimum working flat width; L (i) is the length of the working line at the pit bottom of the open-pit mine; and β is the toe of the end slope of the pit of the open-pit mine.

[0015] Preferably, in step S103, in the current stripping period, the current stripping amount is dumped to the steps under the boundary flat of the inner dump, the standard inner dump steps are converted into combined steps, and the initial form of the inner dump is formed.

[0016] Preferably, in step S104, in response to the forward advancing of the pit corresponding to the current stripping period, based on the initial form of the combined steps, the stripping amount of the ore and rock contained in the remaining coal and rock steps is followed in sequence in the form of the combined steps under the boundary flat of the inner dump, and the boundary flat reaches the maximum width.

[0017] The embodiment of the application also provides a seasonal stripping open-pit mine combined bench space preparation system, comprising: a mine rock stripping amount calculation unit configured to calculate the mine rock stripping amount of the current stripping period of the open-pit mine based on a constructed mine rock stripping amount model of a stope; a preparation and discharge boundary line determination unit configured to determine the preparation and discharge boundary flat disc of the open-pit mine according to the mine rock stripping amount of the current stripping period of the open-pit mine; a combined bench construction unit configured to sequentially and cyclically discharge the mine rock stripping amount of the current stripping period of the open-pit mine to the inner discharge bench below the preparation and discharge boundary flat disc of the dump to form an initial form of the combined bench of the inner dump; wherein the combined bench is composed of one standard inner discharge bench and one inner discharge bench shortened to the minimum working flat disc width; and a combined advancing unit configured to discharge the stripping amount of the current stope to the combined bench below the preparation and discharge boundary flat disc, at this time, the preparation and discharge boundary flat disc reaches the maximum width, the stripping amount of the next year's stripping period is discharged to the position above the preparation and discharge boundary flat disc, and the preparation and discharge boundary flat disc returns to the initial width.

[0018] Technical effects:

[0019] The combined bench space preparation method for the seasonal stripping open-pit mine provided by the embodiment of the application first calculates the mine rock stripping amount of the current stripping period of the open-pit mine based on a constructed mine rock stripping amount model of a stope; then determines the preparation and discharge boundary flat disc of the open-pit mine according to the mine rock stripping amount of the current stripping period of the open-pit mine; then sequentially and cyclically discharges the mine rock stripping amount of the current stripping period of the open-pit mine to the inner discharge bench below the preparation and discharge boundary flat disc of the dump to form an initial form of the combined bench of the inner dump; wherein the combined bench is composed of one standard inner discharge bench and one inner discharge bench shortened to the minimum working flat disc width; and finally, when the stripping amount of the current stope is discharged to the combined bench below the preparation and discharge boundary flat disc, the preparation and discharge boundary flat disc reaches the maximum width, the stripping amount of the next year's stripping period is discharged to the position above the preparation and discharge boundary flat disc, and the preparation and discharge boundary flat disc returns to the initial width. In this way, part of the inner discharge bench of the inner dump is shortened to the minimum working flat disc width to form a combined bench with the adjacent standard inner discharge bench, and the entire open-pit mine is internally discharged in the form of the combined bench. On the one hand, the inner discharge amount below the preparation and discharge boundary flat disc is effectively increased, and the problem of mine production stagnation caused by the interruption of the discharge connection due to the reasons such as advanced stripping and insufficient discharge space is avoided, and the economic benefits are significantly improved. On the other hand, the bench above the preparation and discharge boundary flat disc serves as a reserved preparation space, effectively ensuring the connection development of the stope and the inner dump. When a large amount of stripping is required in the stope, the reserved preparation bench can effectively alleviate the impact on mine production caused by insufficient discharge space. At the same time, the reserved preparation space reduces the phenomenon of high uplink and high downlink of the transport vehicles, reduces the wear and tear of the transport vehicles, improves the safety factor of the truck operators, reduces the inner discharge distance, and increases the stability of the side slope. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the application, and are incorporated in and constitute a part of this specification, the embodiments of the application, and explanations of the application, do not constitute improper limitations on the application. Among them:

[0021] Figure 1 The existing technology open pit dump flat width reduction schematic diagram provided according to some embodiments of the application;

[0022] Figure 2 The flowchart schematic diagram of a seasonal stripping open pit combined bench preparation and space setting method provided according to some embodiments of the application;

[0023] Figure 3 The stope advancing schematic diagram provided according to some embodiments of the application;

[0024] Figure 4 The combined bench preparation and space setting process schematic diagram provided according to some embodiments of the application;

[0025] Figure 5 The normal dump following up of the existing technology internal dump and the dump following up of the combined bench form in the application comparative schematic diagram;

[0026] Figure 6 The dump amount simplified comparative schematic diagram of the normal dump following up of the existing technology internal dump and the dump following up of the combined bench form in the application;

[0027] Figure 7 The structural schematic diagram of a seasonal stripping open pit combined bench preparation and space setting system provided according to some embodiments of the application. DETAILED DESCRIPTION

[0028] The application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. Each example is provided by way of explanation of the application rather than limiting the application. In fact, those skilled in the art will clearly understand that modifications and variations can be made in the application without departing from the scope or spirit of the application. For example, features shown or described as part of one embodiment can be used in another embodiment to produce yet another embodiment. Therefore, it is expected that the application includes such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0029] At present, for seasonal stripping open pits with internal dumping conditions, according to the conventional internal dump design concept, the internal dump flat is usually arranged with a normal working width without reserving preparation and space. When facing the stripping work in spring and summer, when a large amount of stripping occurs on the upper bench of the stope, the mine can only reduce the internal dump flat width to the minimum to bear the advanced stripping amount, such asFigure 1 As a result, it will inevitably lead to:

[0030] First, the upper stripping of the stope needs to be discarded to the inner dump area that has not reached the minimum working width. In this process, part of the stripping is transported to the middle and lower part of the inner dump area through the upper part of the stope, resulting in a large height of the ascending or descending transportation vehicle on site, reducing the driving safety of the transportation vehicle, and increasing the discarding transportation distance. When the flat disc width of the inner dump is reduced to the minimum, the transportation vehicle is crowded, and the stability of the side slope is reduced;

[0031] Second, when the upper flat disc of the stope cannot normally and orderly advance, it will not be able to guarantee normal coal mining in the coal and rock mixed area, and at the same time, it will also cause a part of the raw coal to be exposed for too long. The influence of external weather and the oxidation of the coal seam itself will have a certain impact on the coal quality of the open-pit mine, and even may cause spontaneous combustion, thereby affecting the economic benefits of the open-pit mine;

[0032] Third, the lack of space for equipment in the inner dump will increase the follow-up investment of the open-pit mine, reduce the open-pit mine's disposable funds, and affect the normal production of the open-pit mine.

[0033] Therefore, the applicant proposes a seasonal stripping open-pit mine combined bench preparation space setting method. On the basis of ensuring the stability of the side slope of the inner dump, the method combines the advancing mode of the working slope combined bench of the open-pit mine, quantitatively calculates the reserved preparation space of the inner dump combined bench, so that the mining, transportation and dumping of the mine can be normally connected during the stripping peak period, and the economic effect of the mine is improved.

[0034] As Figure 2 shown, the seasonal stripping open-pit mine combined bench preparation space setting method comprises:

[0035] Step S101, based on the constructed stope rock stripping amount model, calculate the rock stripping amount of the current stripping period of the open-pit mine.

[0036] In this application, the seasonal stripping open-pit mine is usually carried out in summer, because the low temperature and snow in winter may make mining activities difficult or impossible. This mining method involves stripping or removing the surface soil and rock from the mine to expose the mineral matter. This is usually achieved by using large excavators, trucks and other heavy machinery. The stripped soil, rock and rock are usually transported to a temporary storage area or waste rock pile for further processing or backfilling in the future. Here, the rock stripping carried out in the spring and summer of the current year is defined as the current stripping period. As Figure 3 shown, in calculating the rock stripping amount of the current stripping period of the open-pit mine, based on the stope rock stripping amount model:

[0037] V 采 =B×H采场 x (L (j) + H 采场 / tan β) … … (1)

[0038] Determine the current stripping cycle of the open pit mine stripping volume V 采 .

[0039] Wherein, B is the advancing degree of internal dump, H 采场 is the height of the open pit, L (j) is the length of the pit bottom working line of the open pit; β is the end slope foot of the open pit.

[0040] In the open pit area, the height difference between the uppermost coal roof of the open pit and the pit bottom is obtained, and the height difference between the surface of the open pit and the uppermost coal roof is obtained, and then the height difference between the uppermost coal roof of the open pit and the pit bottom is obtained, and the height difference between the surface of the open pit and the uppermost coal roof is obtained. The height of the open pit is obtained by summing the height difference. That is:

[0041] H1+H2=H 采场 …………………………(2)

[0042] H1 is the height difference between the uppermost coal roof of the open pit and the pit bottom, and H2 is the height difference between the surface of the open pit and the uppermost coal roof.

[0043] Step S102, according to the current stripping cycle of the open pit mine stripping volume, determine the open pit mine reserve row demarcation flat plate.

[0044] The open pit dump work flat plate is an important part of the mining process, which refers to the leveling treatment of the excavated earthwork in the open pit. In order to make the excavation area more flat, to facilitate the subsequent work, such as equipment installation, road paving, etc., the flat plate work is usually carried out by special equipment and machinery, such as bulldozers, graders, etc. These equipment can level the length of the mine, so that the ground height and slope of the entire mine area meet the design requirements, in addition, the flat plate work can also remove the sundries and unnecessary rocks in the mine site, improve the use efficiency and safety of the site.

[0045] In open-pit mining, first, blasting operation is carried out to shake and strip off the rock, and the blasting range, frequency and power are strictly controlled to avoid harm to the environment and personnel; then, the rock fragments after blasting are loaded into the transport equipment by mechanical loading equipment (such as excavators, loaders, etc.), and the loaded rock is transported to the inner dump by the transport equipment through the working bank-bank end or pit fixed transport slope, and in the transportation process, the stability of the vehicle needs to be ensured to avoid accidents such as overturning or overturning; then, the transport vehicle reaches the dump, and the rock fragments are dumped in the planned inner dump, wherein the inner dump needs to be strictly designed and constructed according to the standard to ensure that the dumping process will not pollute the surrounding environment; finally, the rock fragments in the dump are flattened, compacted and treated, so as to facilitate subsequent mining operations.

[0046] In the present application, as shown in Figure 4 To ensure the normal continuation and development of the inner dump, the standard inner dump flat plate with increased width in the inner dump needs to be determined, and the stripping amount of the current stripping period of the mine rock is stacked below the inner dump flat plate with increased width in the inner dump to ensure that the advancing degree of the upper and lower parts of the flat plate is consistent. Here, the inner dump flat plate with increased width is determined as the backup boundary flat plate.

[0047] According to the loose coefficient of the open-pit mine, the dumping amount V 弃 of the current stripping period of the open-pit mine can be obtained.

[0048] V 弃 = λV 采 …………………………(3)

[0049] λ is the loose coefficient of the open-pit mine.

[0050] According to the formula:

[0051]

[0052] The boundary line height H3 of the backup flat plate of the inner dump is calculated. Wherein, λ is the loose coefficient of the open-pit mine, V 采 is the stripping amount of the mine rock of the open-pit mine, B is the advancing degree of the inner dump; a is the number of combined steps in the inner dump; L is the width of the dumping flat plate of the inner dump; B min is the minimum working flat plate width; L (i) is the length of the working line at the bottom of the open-pit mine; and β is the end bank slope foot of the open-pit mine. Then, the inner dump flat plate closest to the boundary line height H3 is determined as the backup boundary flat plate of the combined steps.

[0053] The minimum working flat width refers to the minimum flat working surface width required for the mining machinery to operate normally during the mining process. Mining machinery usually needs to run on the surface of the mined coal seam or ore bed, so a wide enough and flat working surface is required. The size of the minimum working flat width depends on the size and characteristics of the mining machinery, and different mining machinery requires different minimum working flat widths. In coal mines, it is generally believed that the minimum working flat width should be more than 2.5 meters (according to different mines) to ensure the normal operation of the mining machinery and the safety of the operators. If the working surface is too narrow, the mining machinery may be stuck or overturned, which will cause the interruption of the mining work and the decrease of the production efficiency.

[0054] In step S103, the stripped amount of the ore rock of the current stripping period of the open-pit mine is sequentially and circularly discarded to the inner dumping bench below the dumping site preparation boundary flat to form an initial form of the preparation of the inner dumping site combined bench.

[0055] As shown in Figure 4 , in the present application, the combined bench is composed of a standard inner dumping bench and an inner dumping bench shortened to the minimum working flat width. Specifically, the inner dumping bench below the H3 elevation is determined to be converted into a combined bench by the stripped amount of the ore rock of the current stripping period to stack the stripped ore rock of the current stripping period. That is, the width of the inner dumping flat closest to the H3 elevation is increased with the H3 elevation as the boundary. The advancing degree of the upper and lower parts is kept consistent, i.e. equal to the advancing degree B of the stope and the inner dumping site, with the preparation grading flat as the boundary, so the width of the preparation boundary flat is increased by the value (l+B) from the standard flat width l. The standard flat width below the preparation boundary flat is shortened to the minimum working flat width. It should be noted that the width of the standard inner dumping flat is related to the mining process, geological conditions, size of mechanical equipment, etc. of the open-pit mine, which is determined according to the actual mining conditions of each open-pit mine.

[0056] As shown in Figure 5 , when the stripped ore rock of the current stripping period is stacked in the form of a combined bench, the previous stripped ore rock is discarded to the bench below the preparation boundary flat of the inner dumping site, the standard inner dumping bench is converted into a combined bench, and the initial form of the preparation of the inner dumping site is formed. That is, the inner dumping bench below the preparation boundary flat is combined into a combined bench by increasing the width of a standard inner dumping bench and decreasing the width of the adjacent standard inner dumping bench below to the minimum working flat width, and then a plurality of combined benches are formed below the preparation boundary flat.

[0057] As shown in Figure 6 , the normal dumping following of the inner dumping site and the dumping following of the combined bench form have equal volumes of discarded objects, i.e. V OBEF = VOBCD When the normal dumping of the internal dumping site is followed, the pushing model V of the dumping material formed in one stripping period OBEF At this time, the corresponding elevation is the normal dumping elevation H of the internal dumping site; when the dumping of the combined step form is followed in the application, the pushing model V of the dumping material formed in one stripping period OBCD At this time, the corresponding elevation is the combined step dumping elevation of the internal dumping site, which is also the elevation H3 of the dumping site boundary flat plate. Wherein, V BCH represents that the advanced stripping material is dumped on the standard step to form the initial form of the standby dumping site; V OBHD represents the model that the stripping material pushes on the standard of the combined step formed in the internal dumping site.

[0058] In step S104, in response to the dumping of the stripping amount of the current mining site on the combined step below the standby dumping site boundary flat plate, the standby dumping site boundary flat plate reaches the maximum width, the stripping amount of the next year's stripping period is dumped to the position above the standby dumping site boundary flat plate, and the standby dumping site boundary flat plate restores the initial width.

[0059] With the forward pushing of the mining site corresponding to the current stripping period, based on the initial form of the standby dumping site of the combined step, the stripping amount of the remaining coal rock step is sequentially followed in the form of the combined step under the standby dumping site boundary flat plate, and the stripping rock of the current stripping period is stacked. In this way, the internal dumping amount is effectively increased, the problem of mine production stagnation caused by the interruption of dumping connection due to insufficient dumping space caused by advanced stripping is avoided, and the economic benefit is significantly improved.

[0060] And on the standby dumping site boundary flat plate, the stripping amount of the mine rock in the spring and summer seasons of the subsequent years is used, at the end of the current year, the flat plate width reaches the maximum flat plate width, with the increase of the stripping amount in the spring and summer seasons of the next year, the dumping space below the flat plate cannot meet the requirement of the dumping amount, and the remaining dumping amount is dumped to the standby dumping site boundary flat plate, with the pushing of the mining site in the autumn and winter seasons, the stripping amount is again dumped below the flat plate, and the flat plate again restores to the initial maximum flat plate width.

[0061] In this way, the step above the standby dumping site boundary flat plate serves as a reserved standby dumping space, effectively ensuring the connection development of the mining site and the internal dumping site. When a large amount of stripping is needed in the mining site, the reserved standby dumping step can effectively alleviate the situation that the mine production is affected due to insufficient dumping space. At the same time, the reserved standby dumping space reduces the phenomenon of high uplink and high downlink of the transport vehicles, reduces the loss of the transport vehicles, improves the safety factor of the truck operation personnel, reduces the internal dumping distance, and increases the stability of the side slope.

[0062] The embodiment of the application also provides a seasonal stripping open-pit mine combined step standby dumping space reserving system, which comprises Figure 7As shown, the system comprises: a stripping amount calculation unit 701 configured to calculate the stripping amount of the current stripping period of the open pit mine based on the constructed stripping amount model of the open pit mine; a bench boundary determination unit 702 configured to determine the bench boundary of the open pit mine according to the stripping amount of the current stripping period of the open pit mine; a combined bench construction unit 703 configured to sequentially cycle the stripping amount of the current stripping period of the open pit mine to the inner bench below the bench boundary of the open pit mine, and form the initial form of the combined bench of the inner dump; wherein the combined bench is composed of a standard inner bench and an inner bench shortened to the minimum working bench width. A combined advancing unit 704 is configured to discard the stripping amount of the current pit to the combined bench below the bench boundary, the bench boundary reaches the maximum width, the stripping amount of the next stripping period is discarded to the position above the bench boundary, and the bench boundary returns to the initial width.

[0063] The seasonal stripping open pit mine combined bench space preparation system provided by the embodiments of the present application can implement the steps and processes of any of the seasonal stripping open pit mine combined bench space preparation methods described above, and achieve the same technical effects. Therefore, they will not be described one by one here.

[0064] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for setting a space for preparing a bench in a seasonal stripping open-pit mine combination bench, characterized in that, Comprise: Step S101, based on the constructed stripping model of the mine rock, the current stripping cycle of the open pit mine is calculated; Step S102, according to the current stripping cycle of the open pit mine, the stripping amount of the mine rock is determined; wherein, according to the formula: Computing the height of the demarcation line of a dump site ; determining the distance demarcation line height The recent inner dump flat disc is the reserve dump demarcation flat disc of the open-pit mine; wherein, The current stripping period of the open-pit mine, The loose coefficient of the open-pit mine, The stripping amount of the open-pit mine, The advancing degree of the inner dump; The group number of the combined steps in the inner dump; The dumping flat disc width of the inner dump; The minimum working flat disc width; The pit bottom working line length of the open-pit mine; The end slope toe of the open-pit mine; Step S103, the current stripping cycle of the open pit mine is discarded to the inner dump bench below the dump bench of the dump bench, and the initial form of the inner dump bench combination bench is formed; wherein, the combination bench is composed of a standard inner dump bench and an inner dump bench shortened to the minimum working bench width; Step S104, the stripping amount of the current mine is discarded to the combination bench below the bench, at this time, the bench reaches the maximum width, the stripping amount of the next year's stripping cycle is discarded to the position above the bench, and the bench restores the initial width.

2. The method for setting space for preparing benches of a combined bench in a seasonal stripping open-pit mine according to claim 1, characterized in that, In step S101, based on the stripping model of the mine rock: Determining the amount of overburden to be removed in a current stripping cycle of a surface mine pit ; wherein is the advancing degree of the internal dump, is the height of the pit of the open pit mine, is the length of the pit bottom working line of the pit of the open pit mine; is the end slope toe of the pit of the open pit mine.

3. The method for setting the combination bench stripping space of the seasonal stripping open pit according to claim 2, characterized in that, In the open-pit mining area, according to the known elevation of the uppermost coal roof, the height difference between the uppermost coal roof of the open-pit mine and the pit bottom of the open-pit mine is obtained , and the height difference between the surface of the open-pit mine and the uppermost coal roof ; The height difference of the uppermost coal roof of the open pit from the pit bottom The height difference of the uppermost coal roof from the surface of the open pit The mining height of the open pit is obtained by performing and operating 4. The method for setting space for preparing benches of a combined bench in a seasonal strip mine according to claim 1, characterized in that, In step S103, In the current stripping cycle, the current stripping amount is discarded to the bench below the inner dump bench of the dump bench, the standard inner dump bench is converted into a combination bench, and the initial form of the inner dump bench is formed.

5. The method for setting space for preparing benches of combined steps in a seasonal strip mine according to claim 1, characterized in that, In step S104, In response to the advance of the current stripping cycle corresponding to the mine, the remaining coal rock bench contains the stripping amount of the mine rock, which is followed in the form of the combination bench under the bench, and the bench reaches the maximum width.

6. A system for setting space for preparing a combined bench of a seasonal stripping open-pit mine, characterized in that, Comprise: The stripping amount calculation unit is configured to calculate the current stripping cycle of the open pit mine based on the constructed stripping model of the mine rock; The bench determination unit is configured to determine the bench of the open pit mine according to the current stripping cycle of the open pit mine; wherein, according to the formula: Computing the height of the demarcation line of a dump site ; determining the distance demarcation line height The recent inner dump flat disc is the reserve dump demarcation flat disc of the open-pit mine; wherein, The current stripping period of the open-pit mine, The loose coefficient of the open-pit mine, The stripping amount of the open-pit mine, The advancing degree of the inner dump; The group number of the combined steps in the inner dump; The dump flat disc width of the inner dump; The minimum working flat disc width; The pit bottom working line length of the open-pit mine; The end slope toe of the open-pit mine; The combination bench construction unit is configured to sequentially cycle the stripping amount of the current stripping cycle of the open pit mine to the inner dump bench below the bench of the dump bench, and form the initial form of the inner dump bench combination bench; wherein, the combination bench is composed of a standard inner dump bench and an inner dump bench shortened to the minimum working bench width; The combination advancing unit is configured to discard the stripping amount of the current mine to the combination bench below the bench, at this time, the bench reaches the maximum width, the stripping amount of the next year's stripping cycle is discarded to the position above the bench, and the bench restores the initial width.

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