A method and system for coordinated mining of lower coal seams in non-working banks of an open pit mine

Abstract

The application provides a strip mine non-working bank middle and lower coal seam coordinated mining method and system. In the method, the influence factors of the non-working bank residual coal mining scheme are evaluated to determine whether the strip mine non-working bank residual coal has mining feasibility, if the strip mine non-working bank residual coal has mining feasibility, the lower coal seam and the middle coal seam of the non-working bank are coordinated mined according to the residual coal mining scheme of the strip mine non-working bank; and during the mining, based on the pre-constructed evaluation model, the preset evaluation index is determined according to the actual mining data and the mining target data in the residual coal mining scheme, so as to adjust the residual coal mining scheme in real time through the earned value method. In this way, through the coordinated mining of the middle and lower coal seams, the real-time adjustment of the residual coal mining target is realized, the residual coal mining scheme is more reasonable, the mining progress and cost can be scientifically and effectively managed, and the mining period of the strip mine non-working bank is ensured to be consistent with the plan target.

Description

Technical Field

[0001] This application relates to the field of coal mining technology, and in particular to a method and system for coordinated mining of the lower coal seams in the non-working side of an open-pit mine. Background Technology

[0002] In open-pit coal mines, coal resources are found under complex conditions, characterized by multiple coal seams, thick coal seams, thick overburden coal seams, large differences in lithology, complex geological structures, and near-horizontal or gently dipping burial. In near-horizontal open-pit coal seams, the coal seam thickness is large and the working line is long. A large amount of overburdened resources in the non-working side are not recovered, resulting in a great waste of coal resources.

[0003] Currently, the mining of non-working coal seams is limited by factors such as mining technology, mining costs, and geological conditions. Typically, the design only targets a single coal seam, and there is a lack of a unified mining scheme that combines multiple coal seams in the middle and lower parts.

[0004] Therefore, there is an urgent need to provide a technical solution that addresses the shortcomings of the existing technology. Summary of the Invention

[0005] The purpose of this application is to provide a method and system for coordinated mining of the lower coal seams in the non-working side of an open-pit mine, so as to solve or alleviate the problems existing in the prior art.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] This application provides a method for coordinated mining of the lower and middle coal seams in an open-pit mine non-working side, comprising: step S101, evaluating the residual coal mining scheme of the non-working side to determine whether the residual coal in the open-pit mine non-working side is feasible for mining; step S102, in response to the feasibility of mining the residual coal in the open-pit mine non-working side, coordinating the mining of the lower and middle coal seams of the non-working side according to the residual coal mining scheme of the open-pit mine non-working side; step S103, adjusting the residual coal mining scheme based on preset evaluation indicators using the earned value method; wherein, the preset evaluation indicators are determined based on a pre-constructed evaluation model and according to the actual mining data and the mining target data of the residual coal mining scheme.

[0008] Preferably, in step S101, the residual coal mining scheme for the non-working side of the open-pit mine is evaluated based on a pre-constructed mining feasibility model; wherein, the mining feasibility model is:

[0009]

[0010] Where h represents the time cost of residual coal mining in the non-working side, C represents the unit transportation cost of residual coal mining in the non-working side, z1 represents the amount of stripped material discharged from the lower coal seam, l1 represents the transportation distance of the stripped material discharged from the lower coal seam, z2 represents the amount of stripped material discharged from the middle coal seam, and l2 represents the transportation distance of the stripped material discharged from the middle coal seam.

[0011] q represents the transportation cost savings when the non-working slope is used for residual coal mining, v represents the volume of waste material discharged from the waste dump of the non-working slope, and l' represents the external transportation distance when all the stripped material is discharged when the non-working slope is used for residual coal mining.

[0012] W represents the net revenue from the recovery of residual coal in the non-working coal seam, y represents the total recovery revenue of the lower coal seam, and f represents the total recovery revenue of the middle coal seam.

[0013] Preferably, in step S102, mining of the middle coal seam begins only after the mining of the lower coal seam meets the equipment operating safety distance, and the safety distance L between the construction team of the lower coal seam and the construction team of the middle coal seam is maintained. 安 It is greater than or equal to the minimum working plate width.

[0014] Preferably, step S102 includes: excavating an initial cut at the lower coal seam in preparation for mining the lower coal seam;

[0015] The lower coal seam is mined by horizontal mining and internal dumping, with the internal dumping site simultaneously following the mining of the lower coal seam;

[0016] The lower coal seam is mined forward until the space of the inner spoil disposal area is suitable for recovering the middle coal seam. The middle coal seam is then mined by means of horizontal mining and inner spoil disposal.

[0017] The lower coal seam and the middle coal seam are mined in a coordinated manner, sharing the internal spoil heap, until the mining of the lower coal seam is completed, and then the mining of the middle coal seam continues.

[0018] Preferably, in step S103, the evaluation model is:

[0019]

[0020] Wherein, SV, SV, SPI, and CPI are the cost index, schedule index, cost performance index, and schedule performance index respectively when the non-working group is mining residual coal; BCWP is the planned cost of the completed project in the mining target data when the non-working group is mining residual coal; ACWP is the actual cost of the completed project in the actual mining data when the non-working group is mining residual coal; and BCWS is the planned cost of the project to be completed in the mining target data when the non-working group is mining residual coal.

[0021] Preferably, it also includes: after adjusting the residual coal mining scheme, according to the prediction model:

[0022]

[0023] The completion time and cost of residual coal mining in the non-working slope are predicted.

[0024] Wherein, ETC is the predicted completion time of the non-working coal recovery, AE is the actual time spent on the non-working coal recovery, and ED is the initial completion time in the recovery target data when the non-working coal recovery is carried out.

[0025] EC is the predicted completion cost of residual coal mining in the non-working area, AC is the current actual cost incurred when the non-working area mines residual coal, PV is the total mining value in the mining target data when the non-working area mines residual coal, and EV is the total mining value in the actual mining data when the non-working area mines residual coal.

[0026] This application embodiment also provides a coordinated mining system for the lower and middle coal seams of an open-pit mine non-working side, comprising: an evaluation unit configured to evaluate the influencing factors of the residual coal mining scheme of the non-working side to determine whether the residual coal of the open-pit mine non-working side is feasible for mining; a mining unit configured to, in response to the feasibility of mining the residual coal of the open-pit mine non-working side, coordinate the mining of the lower and middle coal seams of the non-working side according to the residual coal mining scheme of the open-pit mine non-working side; and an adjustment unit configured to adjust the residual coal mining scheme based on preset evaluation indicators and using the earned value method; wherein the preset evaluation indicators are determined based on a pre-constructed evaluation model and according to the actual mining data and the mining target data of the residual coal mining scheme.

[0027] Beneficial effects:

[0028] The coordinated mining method for the lower and middle coal seams of the non-working side in open-pit mines provided in this application embodiment assesses the influencing factors of the residual coal mining scheme for the non-working side to determine whether the residual coal in the non-working side of the open-pit mine is feasible for mining. If the residual coal in the non-working side of the open-pit mine is feasible for mining, then the lower and middle coal seams of the non-working side are coordinated for mining according to the residual coal mining scheme. Furthermore, during mining, based on a pre-constructed evaluation model, preset evaluation indicators are determined according to the actual mining data and the mining target data in the residual coal mining scheme. The earned value method is then used to adjust the residual coal mining scheme in real time. Therefore, through the coordinated mining of the lower and middle coal seams and the continuous real-time adjustment of the residual coal mining target, the residual coal mining scheme for the non-working side of the open-pit mine becomes more reasonable, which is conducive to the scientific and effective management of mining progress and costs, and maximizes the consistency between the mining period, budget, and planned targets of the non-working side of the open-pit mine. Attached Figure Description

[0029] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. Wherein:

[0030] Figure 1 This is a flowchart illustrating a method for coordinated mining of the lower coal seam in a non-working side of an open-pit mine, according to some embodiments of this application.

[0031] Figure 2 A logic diagram of a coordinated mining method for the lower coal seam in an open-pit mine non-working side, provided according to some embodiments of this application;

[0032] Figure 3 This is a schematic diagram of coordinated mining of the lower coal seam in the non-working side of an open-pit mine, according to some embodiments of this application.

[0033] Figure 4 This is a schematic diagram of a coordinated mining system for the lower coal seam in an open-pit mine non-working side, provided according to some embodiments of this application. Detailed Implementation

[0034] The present application will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present application without departing from the scope or spirit thereof. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present application encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0035] First, it should be noted that in the mining industry, coal mines are divided into different sections and layers, including the upper, middle, and lower sections of open-pit mines. These divisions are typically determined by geological conditions, mining methods, and characteristics of the ore extraction process. The specific definitions of the upper, middle, and lower sections can vary depending on geological conditions, ore type, and mining strategy.

[0036] In open-pit mines, the upper coal seam typically refers to the topmost coal seam during the mining process, also known as the "top layer." It has a shallower overburden depth and is located at the starting point of open-pit mining. The middle coal seam typically refers to one or more coal seams below the upper seam. In coal mining, the middle coal seam is usually the primary target, as it has a deeper overburden depth and requires more in-depth mining operations. The lower coal seam typically refers to the bottommost coal seam below the middle seam, also known as the "bottom layer." It has the deepest overburden depth and is usually the last layer to be mined.

[0037] Currently, the mining of residual coal in non-working face coal seams in open-pit mines is designed only for single coal seams, lacking a unified mining scheme that combines the middle and lower coal seams of the non-working face. When mining a single coal seam, each seam's equipment operates independently, resulting in low equipment utilization and significant coal loss and waste. Therefore, this application proposes a coordinated mining method for the middle and lower coal seams in non-working face coal seams of open-pit mines. This method simultaneously mines both the middle and lower coal seams, maximizing the comprehensive utilization of coal resources in the deposit, reducing resource waste and coal loss, and improving coal extraction rate and ore utilization rate. Furthermore, coordinated mining of the middle and lower coal seams effectively achieves parallel mining, accelerating the mining speed, improving mine efficiency, reducing mining costs, and increasing economic benefits. Simultaneously, coordinated mining of the middle and lower coal seams allows for the sharing of facilities and equipment, such as ventilation systems, water drainage systems, and transportation equipment, effectively reducing redundant construction of facilities and equipment, improving equipment utilization efficiency, and saving investment costs.

[0038] like Figure 1 , Figure 2 As shown, the coordinated mining method for the lower coal seam in the non-working side of this open-pit mine includes:

[0039] Step S101: Evaluate the residual coal mining plan for the non-working side to determine whether the residual coal in the non-working side of the open-pit mine is feasible for mining.

[0040] In this application, considering the impact of the residual coal recovery scheme of the non-working side of the open-pit mine on the entire open-pit mine, the feasibility of the residual coal recovery scheme of the non-working side of the open-pit mine is determined. Under the condition of meeting the feasibility, as much residual coal as possible is recovered from the non-working side to improve economic benefits.

[0041] After the residual coal in the non-working slope of the open-pit mine is mined, it will inevitably lead to the lag in the development of the internal waste dump, resulting in corresponding time costs. At the same time, after the residual coal in the non-working slope is mined, the internal dumping space capacity is expanded to a certain extent. Assuming that the dumped materials in this space need to be externally dumped before mining, the freight saved due to the expansion of the internal dumping space capacity can be calculated based on the volume of the externally dumped materials. When the net income value of the mined residual coal and the saved external dumping freight are not sufficient to offset the time cost, it means that the entire mining plan is not feasible, and normal dumping and overlying of the internal waste dump can be directly carried out; otherwise, the mining is feasible.

[0042] Specifically, based on the pre-constructed mining feasibility model, the residual coal mining plan for the non-working slope of the open-pit mine is evaluated to determine whether the residual coal in the non-working slope of the open-pit mine is feasible.

[0043] Among them, the mining feasibility model is:

[0044]

[0045] In the formula, h represents the time cost of mining residual coal in the non-working slope, C represents the unit haulage cost when mining residual coal in the non-working slope, z1 represents the external discharge volume of the additional overburden in the lower coal seam, l1 represents the haulage distance when the additional overburden in the lower coal seam is externally discharged, z2 represents the external discharge volume of the additional overburden in the middle coal seam, l2 represents the haulage distance when the additional overburden in the middle coal seam is externally discharged; q represents the transportation cost savings when mining residual coal in the non-working slope, v represents the volume of the dumped materials in the external waste dump of the non-working slope, l' represents the external haulage distance when all the overburden is externally discharged during the mining of residual coal in the non-working slope; W represents the net income of mining residual coal in the non-working slope, y is the total recovery income of the lower coal seam, and f is the total recovery income of the middle coal seam. Here, it should be noted that during the mining process, not all the overburden needs to be externally transported, and l' is the haulage distance assuming that all the overburden mined needs to be externally discharged.

[0046] Combined with the time cost h generated by the lag in the development of the internal waste dump, the freight q saved due to the expansion of the internal dumping space capacity, and the net income W of the residual coal mining, the feasibility of the residual coal mining plan for the non-working slope is judged. Specifically, when h≥q + W, it means that the net income value of the mined residual coal and the saved external dumping freight are not sufficient to offset the time cost, and the entire residual coal mining plan is not feasible, and normal dumping and overlying of the internal waste dump can be directly carried out; when h < q + W, the coordinated mining of the lower and middle coal seams can be carried out according to the predetermined residual coal mining plan.

[0047] Step S102, in response to the feasibility of mining the residual coal in the non-working slope of the open-pit mine, the lower coal seam and the middle coal seam of the non-working slope are coordinately mined according to the residual coal mining plan of the non-working slope of the open-pit mine.

[0048] Once the feasibility of the residual coal mining scheme for the non-working face of an open-pit mine is established, it is necessary to minimize mining costs while considering the mining procedures. During residual coal mining, operational needs lead to a relative delay in internal drainage. To minimize the impact of this delay, it is necessary to coordinate the mining of residual coal across the entire non-working face and implement "schedule-cost" coordination control for the mining scheme, ensuring optimal skill duration and lowest cost throughout the entire process. In this application, by coordinating the construction of the middle and lower coal seams simultaneously, the mining period for residual coal in the entire non-working face is minimized, effectively saving overall construction time.

[0049] In this application, mining of the middle coal seam begins only after a certain internal drainage distance (meeting the safety distance for equipment operation) has been established through the mining of the lower coal seam, ensuring that the middle and lower coal seams are mined simultaneously. During the coordinated mining of the middle and lower coal seams, due to the relatively small overall slope angle, a certain safety distance needs to be maintained between the two construction teams; specifically, a safety distance L needs to be maintained between the construction team of the lower coal seam and the construction team of the middle coal seam. 安 When L 安 ≥B min When the minimum working platform width is reached, the middle and lower coal seams can be mined in a coordinated manner. Specifically, an initial cut is made at the lower coal seam to prepare for its mining; the lower coal seam is mined using a transverse mining and internal dumping method, with the internal dumping site simultaneously following the mining of the lower coal seam; when the lower coal seam is mined forward until the space in the internal dumping site is sufficient to recover the middle coal seam, the middle coal seam begins mining using a transverse mining and internal dumping method; the lower and middle coal seams are mined in a coordinated manner, sharing the internal dumping site, until the mining of the lower coal seam is completed, and then the mining of the middle coal seam continues, such as... Figure 3 As shown.

[0050] Step S103: Based on the preset evaluation indicators, adjust the residual coal mining scheme using the earned value method.

[0051] In the implementation of the residual coal recovery scheme in the non-working side of an open-pit mine, to minimize the impact of delayed internal drainage, a "schedule-cost" coordination control is implemented for the entire residual coal recovery process. This application optimizes the planned recovery cost and schedule of the residual coal recovery scheme based on preset evaluation indicators and using the earned value method, thereby adjusting the residual coal recovery scheme. The preset evaluation indicators are determined based on a pre-constructed evaluation model, using actual recovery data and the recovery target data of the residual coal recovery scheme. Specifically, the cost indicators, schedule indicators, cost-performance indicators, and schedule-performance indicators for residual coal recovery in the non-working side are determined based on the evaluation model.

[0052] In this application, the evaluation model is:

[0053]

[0054] In the formula, CV, SV, SPI, and CPI are the cost, schedule, cost-performance, and schedule-performance indicators, respectively, when the non-working group is mining residual coal; BCWP is the planned cost of the completed work in the mining target data when the non-working group is mining residual coal; ACWP is the actual cost of the completed work in the actual mining data when the non-working group is mining residual coal; and BCWS is the planned cost of the work to be completed in the mining target data when the non-working group is mining residual coal.

[0055] The cost index CV is the difference between the planned cost of completed work and the actual cost of completed work. It reflects the gap between the current actual cost and the budgeted cost. When CV>0, it indicates that the project cost (i.e., the actual cost of completed work) is lower than the budget (i.e., the planned cost of completed work); when CV=0, it indicates that the project cost is in line with the budget; when CV<0, it indicates that the project cost exceeds the budgeted cost.

[0056] The schedule indicator SV is the difference between the planned cost of completed work and the planned cost of work to be completed, reflecting whether the overall project schedule is in line with the plan. When SV > 0, it indicates that the actual progress of the project (planned cost of completed work) is ahead of the planned progress (planned cost of work to be completed); when SV = 0, it indicates that the actual progress is in line with the planned progress; when SV < 0, it indicates that the actual progress is behind the planned progress.

[0057] The cost performance index (SPI) measures the deviation between the completed project schedule (actual progress) and the planned project schedule (planned progress). When SPI > 1, it indicates that the actual progress is ahead of the plan; when SPI = 1, it indicates that the actual progress is on schedule; when SPI < 1, it indicates that the actual progress is behind the planned progress.

[0058] The Cost-Performance Index (CPI) measures the deviation between the planned cost (budget) and the actual cost (actual cost) of completed work. A CPI > 1 indicates that the actual cost is lower than the budget; a CPI = 1 indicates that the actual cost is the same as the budget; and a CPI < 1 indicates that the actual cost is higher than the budget.

[0059] Therefore, by using cost indicators, schedule indicators, cost-performance indicators, and schedule-performance indicators for residual coal mining in non-working areas, the costs and schedules during the residual coal mining process in non-working areas can be coordinated and controlled, and a corresponding optimal construction schedule plan for residual coal mining can be formulated.

[0060] After adjusting the target data for the residual coal mining scheme, according to the prediction model:

[0061]

[0062] The completion time and cost of residual coal mining by non-working groups are predicted. Here, ETC is the predicted completion time of residual coal mining by non-working groups, AE is the current actual time spent on residual coal mining by non-working groups, ED is the initial completion time in the target data of residual coal mining by non-working groups; EC is the predicted completion cost of residual coal mining by non-working groups, AC is the current actual cost spent on residual coal mining by non-working groups, PV is the total value of residual coal mining in the target data of residual coal mining by non-working groups, and EV is the total value of residual coal mining in the actual mining data of residual coal mining by non-working groups.

[0063] In this application, through coordinated mining of the middle and lower coal seams, and based on the continuous real-time adjustment of the residual coal mining target based on the cost indicators, schedule indicators, cost performance indicators, and schedule performance indicators during residual coal mining, the residual coal mining plan of the non-working side of the open-pit mine is made more reasonable. This is conducive to the scientific and effective management of mining progress and costs, and maximizes the guarantee that the mining period, budget, and planned targets of the non-working side of the open-pit mine are consistent.

[0064] This application also provides a coordinated mining system for the lower and middle coal seams in the non-working face of an open-pit mine, such as... Figure 4 As shown, the coordinated mining system for the lower and middle coal seams of the non-working side in an open-pit mine includes an evaluation unit 401, a mining unit 402, and an adjustment unit 403. The evaluation unit 401 is configured to evaluate the influencing factors of the residual coal mining scheme for the non-working side to determine whether the residual coal in the non-working side of the open-pit mine is feasible for mining. The mining unit 402 is configured to coordinate the mining of the lower and middle coal seams of the non-working side according to the residual coal mining scheme of the non-working side, in response to the feasibility of mining the residual coal in the non-working side. The adjustment unit 403 is configured to adjust the residual coal mining scheme based on preset evaluation indicators using the earned value method. The preset evaluation indicators are determined based on a pre-constructed evaluation model and the actual mining data and the mining target data of the residual coal mining scheme.

[0065] The open-pit mine non-working slope lower coal seam coordinated mining system provided in this application embodiment can realize the steps and processes of the open-pit mine non-working slope lower coal seam coordinated mining method described in any of the above embodiments, and achieve the same technical effect, which will not be repeated here.

[0066] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for coordinated mining of the lower and middle coal seams in the non-working face of an open-pit mine, characterized in that, include: Step S101: Evaluate the residual coal mining plan for the non-working side to determine whether the residual coal in the non-working side of the open-pit mine is feasible for mining. Step S102: In response to the feasibility of mining the residual coal in the non-working side of the open-pit mine, the lower and middle coal seams of the non-working side are coordinated for mining according to the mining plan for the residual coal in the non-working side of the open-pit mine; wherein, on the premise that the mining of the lower coal seam meets the equipment operation safety distance, the mining of the middle coal seam begins, and the safety distance between the construction team of the lower coal seam and the construction team of the middle coal seam is maintained. Greater than or equal to the minimum working plate width; An initial cut is made at the lower coal seam to prepare for its mining. The lower coal seam is then mined using a transverse mining and internal dumping method, with the internal dumping site simultaneously supporting the mining. The lower coal seam is mined forward until the space in the internal dumping site is sufficient to recover the middle coal seam. The middle coal seam is then mined using a transverse mining and internal dumping method. The lower and middle coal seams are mined forward in a coordinated manner, sharing the internal dumping site, until the mining of the lower coal seam is completed. The mining of the middle coal seam then continues. Step S103: Based on preset evaluation indicators, adjust the residual coal mining plan using the earned value method; wherein, the preset evaluation indicators are determined based on a pre-constructed evaluation model, according to actual mining data and the mining target data of the residual coal mining plan; the evaluation model is: ； in, These are the cost indicators, schedule indicators, cost performance indicators, and schedule performance indicators for the residual coal mining of the non-working side, respectively. When performing residual coal mining for the non-working slope, the planned engineering costs in the mining target data have already been completed. The actual cost of completed work in the actual mining data when reclaiming residual coal for the non-working slope. The project cost to be completed in the target data of the mining operation for the non-working coal recovery is included in the mining plan.

2. The method for coordinated mining of the lower coal seam in the non-working side of an open-pit mine according to claim 1, characterized in that, In step S101, Based on a pre-constructed feasibility model for coal recovery, the residual coal recovery scheme for the non-working side of the open-pit mine is evaluated; wherein, the feasibility model for coal recovery is: ； in, Characterizes the time cost of residual coal mining in the non-working section. This characterizes the unit transportation cost when the non-working slope is used for residual coal mining. Characterized by the increased amount of stripped material discharged from the lower coal seam. The haul distance characterizes the increased material removal distance from the lower coal seam. Characterized by the increased amount of stripped material discharged from the central coal seam. The transport distance during the removal of the increased stripping material from the central coal seam; This characterizes the cost savings in transportation during residual coal mining in the non-working section. Characterizes the volume of waste material discharged from the off-site spoil heap of the non-working side. The discharge distance is characterized by the total stripping material being discharged when the non-working side is undergoing residual coal mining. This characterizes the net revenue from residual coal recovery at the non-working slope. The total recovery revenue of the lower coal seam. This represents the total recovery revenue from the central coal seam.

3. The method for coordinated mining of the lower coal seam in the non-working side of an open-pit mine according to claim 1, characterized in that, Also includes: After adjusting the residual coal mining scheme, according to the prediction model: ； The completion time and cost of residual coal mining in the non-working slope are predicted. in, The predicted completion time for residual coal mining in the non-working section is given. The actual time currently spent on residual coal mining in the non-working section. The initial completion time in the target mining data when reclaiming residual coal for the non-working side; The predicted completion cost for residual coal recovery from the aforementioned non-working slope. The actual cost currently incurred when mining residual coal for the non-working side. The total value of coal recovery in the recovery target data when recovering residual coal for the non-working slope. The total value of coal recovery in the actual recovery data when the non-working coal is recovered.

4. A coordinated mining system for the lower and middle coal seams of an open-pit mine non-working face, characterized in that, include: The evaluation unit is configured to evaluate the influencing factors of the residual coal mining scheme of the non-working side to determine whether the residual coal of the non-working side of the open-pit mine is feasible for mining. The mining unit is configured to coordinate the mining of the lower and middle coal seams of the non-working side of the open-pit mine in response to the feasibility of mining the residual coal in the non-working side, according to the mining plan for the residual coal in the non-working side. Specifically, mining of the middle coal seam begins only after the mining of the lower coal seam meets the equipment operating safety distance, and the safety distance between the construction teams of the lower and middle coal seams is maintained. Greater than or equal to the minimum working plate width; An initial cut is made at the lower coal seam to prepare for its mining. The lower coal seam is then mined using a transverse mining and internal dumping method, with the internal dumping site simultaneously supporting the mining. The lower coal seam is mined forward until the space in the internal dumping site is sufficient to recover the middle coal seam. The middle coal seam is then mined using a transverse mining and internal dumping method. The lower and middle coal seams are mined forward in a coordinated manner, sharing the internal dumping site, until the mining of the lower coal seam is completed. The mining of the middle coal seam then continues. The adjustment unit is configured to adjust the residual coal mining scheme based on preset evaluation indicators using the earned value method; wherein, the preset evaluation indicators are determined based on a pre-constructed evaluation model, according to actual mining data and the mining target data of the residual coal mining scheme; the evaluation model is: ； in, These are the cost indicators, schedule indicators, cost performance indicators, and schedule performance indicators for the residual coal mining of the non-working side, respectively. When performing residual coal mining for the non-working slope, the planned engineering costs in the mining target data have already been completed. The actual cost of completed work in the actual mining data when reclaiming residual coal for the non-working slope. The project cost to be completed in the target data of the mining operation for the non-working coal recovery is included in the mining plan.

Images