CN117390848A - Strip mine safety cost accounting and boundary optimizing method based on refined model - Google Patents
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Abstract
The invention provides a strip mine safety cost accounting and boundary optimizing method based on a refined model, which relates to the technical field of strip mines and comprises the steps of establishing a refined mechanical parameter numerical simulation model according to rock mechanical parameters and numerical simulation software; providing a safety cost accounting formula of the surface mine monitoring equipment and the reinforcement means, and establishing a metering and pricing rule method of the surface mine slope monitoring equipment and the reinforcement means; different candidate boundaries with the largest economic value are generated in boundary optimization software through changing the mine slope angle, numerical simulation is carried out, the size and the range of potential landslide bodies of the different candidate boundary slopes are determined, and equipment and schemes for slope stability monitoring and reinforcement are selected and formulated according to the size and the range; carrying out safety cost accounting on the investment of different candidate boundaries on the monitoring and reinforcement of potential landslide bodies, and updating the net present value NPV of the project; and selecting the boundary with the largest net present value as the final boundary of the mine by comparing different candidate boundaries, thereby realizing the economical-safe efficient mining of the surface mine.
Description
Technical Field
The invention relates to the technical field of surface mines, in particular to a surface mine safety cost accounting and boundary optimizing method based on a refined model.
Background
The surface mining is one of main mining methods, has the characteristics of high safety, quick approach of large equipment, low cost and high yield, and can obtain high yield in a short time. However, there is a certain defect in surface mining, in which a large amount of rock is required to be mined and stripped, and adverse effects are inevitably caused on the surface topography, groundwater, woodland grasslands, animal habitat and the like. In addition, surface mines often have landslide risks due to instability and disturbance of the rock formations, which can have economic losses and adverse effects on the mine.
In order to reduce the safety risk and property loss caused by landslide, a series of monitoring means and reinforcing measures are adopted by mines aiming at the side slope to prevent early warning of the instability of the side slope, such as monitoring equipment of microseisms, anchor rod dynamometers, multipoint displacement meters and the like and reinforcing means of anchor rods, anchor cables, lattice beams and the like, and the method has important theoretical and practical significance for promoting the safe and efficient exploitation of mineral resources and reducing the economic loss of surface mine exploitation.
Due to the introduction of the mine block model, the floating cone method is widely applied. And constructing a block model of the surface mine ore body through geological drilling exploration, data collection, importing a geological database and a three-dimensional mine modeling software processing database. The block model divides the rock in the mining range into blocks in three dimensions, each block is endowed with various attributes, and mine design optimization and numerical calculation are greatly facilitated.
At present, a plurality of students at home and abroad conduct a series of researches on surface mine cost accounting and final boundary optimization, and obtain a plurality of achievements, but the problems are as follows: in many studies of surface mine cost accounting, such as "Xu X C, gu X W, wang Q.Production scheduling optimization considering ecological costs for open pit metal mines [ J ]. Journal of Cleaner Production,2018,180:210-221 ]", "Liu Y, zhang C, xu X.Assembly of Energy conservation potential and cost in open-pit metal, from-up approach integrated Energy conservation supply curve and ultimate pit limit [ J ]. Energy Policy,2022,163 ]", "Li Ning, guo Yuhang, wang Jizhou, etc., a method for constructing an ecological cost accounting model for surface mining of mines [ P ]. Hubei province: CN114897387a,2022-08-12 "," Xu X C, gu X W, wang q.ulimate pit optimization with ecological cost for open pit metal mines J, transactions of Nonferrous Metals Society of China,2014,24 (5): 1531-1537", accounting for ecological, economic, energy costs during surface mining is common, some also taking into account the final boundary optimization of biochemistry to surface mining within this portion of costs. Aiming at the monitoring and reinforcing cost of the slope disasters of the strip mine, the research at home and abroad at present lacks an effective quantification means. Aiming at the areas with large landslide risk and low geological strength, accounting, reinforcing and monitoring costs are favorable for improving production efficiency, reducing operation risks, ensuring safe and orderly production processes and realizing enterprise safety management targets.
Therefore, an open mine monitoring and reinforcement safety cost formula needs to be constructed to quantify the safety cost related to monitoring and reinforcement in preventing mine slope instability. The surface mine monitoring reinforcement safety cost accounting not only provides reference for optimization design of the surface boundaries of mine enterprises, balances investment and safety better, but also is beneficial to relevant departments to monitor the behaviors of the mine enterprises so as to ensure that necessary safety measures are taken to reduce landslide risk early warning safety accidents.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a strip mine safety cost accounting and boundary optimizing method based on a refined model; the three-dimensional geological model from the outside to the inside and the space variability of rock parameters are considered, so that the fine characterization of rock mechanical parameters is realized, a mine fine block model is built according to the fine characterization, the fine assessment and monitoring of the mine slope stability are realized, the safety cost input in the aspects of landslide risk area, monitoring early warning, slope reinforcement and the like is quantized, and the final boundary of an open-pit mine which simultaneously considers the economic and safety cost is obtained by combining with the optimization of the mine exploitation cost.
A strip mine safety cost accounting and boundary optimizing method based on a refined model comprises the following steps:
step 1: determining a geological strength index GSI sample value through a rock quality index RQD and joint distribution, and establishing a surface mine refined rock mass quality representation model by using mine modeling software;
the method comprises the steps of establishing a mine digital ground model through unmanned aerial vehicle oblique photogrammetry, calculating rock quality index RQD through drilling rock cores, and determining rock mass structure types through joint distribution of unmanned aerial vehicle photographic side slope surfaces. Determining a geological strength index GSI sample value by combining the rock mass structure type and the structural surface condition; carrying out geospatial variability statistics and geological strength index attribute interpolation by adopting a geostatistical principle in mine modeling software 3Dmine, thereby establishing a surface mine refined rock mass characterization model from the outside to the inside;
step 2: based on an open mine refined rock mass quality representation model, combining a geological strength index GSI and a rock mechanics index, calculating rock mechanics parameters by applying a geostatistical method and combining a Hoek-Brown criterion, and establishing a rock physical mechanics parameter representation space variability block model; generating grids by using a rock physical and mechanical parameter space variability block model through a grid dividing program by adopting a three-dimensional mapping method, importing the grids into numerical simulation software through a data interface, and endowing parameters to each grid unit to obtain a refined mechanical parameter numerical simulation model;
step 3: establishing a safety cost accounting formula of surface mine monitoring equipment and reinforcing means, and establishing a metering and pricing rule method of the surface mine for slope monitoring equipment and reinforcing means;
step 3.1: in order to calculate the safety cost of the surface mine monitoring equipment and the reinforcement means, a safety cost calculation formula of the surface mine monitoring equipment and the reinforcement means is established, namely according to the cost C of the monitoring equipment ME Cost of slope reinforcement C SR Post maintenance update cost C MA Calculating the monitoring and reinforcing safety cost of the surface mine;
wherein the surface mine monitors and consolidates the safety cost C MS The calculation formula of (2) is as follows:
C MS ＝C ME +C SR +C MA (1)
step 3.2: establishing an open mine slope monitoring reinforcement engineering quantity metering rule and a comprehensive unit price metering rule according to the risk area, and respectively calculating the cost of monitoring equipment, the slope reinforcement cost and the maintenance and update cost;
the monitoring equipment cost C ME Cost of slope reinforcement C SR Post maintenance update cost C MA The engineering quantity and the comprehensive unit price are respectively determined, and the method specifically comprises the following steps:
C ME ＝∑N me，i ·C cp，i (2)
C SR ＝∑N sr，j ·C cp，j (3)
C MA ＝∑(C h ·T+P u ) (4)
wherein: n (N) me，i Monitoring engineering quantity for ith monitoring equipment, C cp，i For the comprehensive unit price of the ith monitoring equipment, N sr，j Engineering quantity of j-th reinforcement measure, C cp，j For the comprehensive unit price of the j-th reinforcement measure, C h The cost of labor hour required for maintenance or update, T is the time for maintenance and update, P u Price for the replacement parts;
wherein the integrated unit price C of the surface mine for the ith monitoring device is calculated cp，i The method of (2) is as follows:
C cp，i ＝C ep，i +C in.i +C de，i (2)
wherein C is ep，i The equipment price of the ith monitoring equipment, C in.i For the installation cost of the ith monitoring equipment, C de，i The debugging cost for the ith monitoring equipment;
calculating comprehensive unit price C of surface mine aiming at j-th reinforcement measure cp，j The method of (2) is as follows:
C cp，j ＝C ma，j +C la，j +C me，j (3)
wherein C is ma，j Engineering material costs for the j-th reinforcement, C la，j For the labor cost of the j-th reinforcement measure, C me，j The cost of use of the machine equipment for the j-th reinforcement measure;
the method for establishing the metering and pricing rule of the surface mine for slope monitoring equipment and reinforcing means comprises the following steps:
(1) Monitoring equipment engineering quantity calculation rules:
table 1 monitoring engineering quantity calculation rules
(2) Calculating rules of slope reinforcement engineering quantity:
table 2 rules for calculating the amount of reinforcement work on a side slope
Step 4: different candidate boundaries with the largest economic value are generated in boundary optimization software Whittle by changing the angle of the mine slope, numerical simulation is carried out by combining a numerical simulation model of the refined mechanical parameters, the size and the range of potential landslide bodies of the slopes with different candidate boundaries are determined, and equipment and a scheme for monitoring and reinforcing the slope stability are selected and formulated according to the size and the range;
step 4.1: generating different candidate boundaries by improving final slope angle parameters by using surface mine boundary optimization software Whittle;
step 4.2: and combining a numerical simulation model of the refined mechanical parameters, performing numerical simulation on the boundary slopes in numerical simulation software Flac3d, and determining the sizes and the ranges of potential landslide bodies of different candidate boundary slopes.
Step 4.3: and selecting and formulating equipment and a scheme for monitoring and reinforcing the slope stability according to the determined potential landslide area of the mine to be monitored and reinforced.
Step 5: carrying out safety cost accounting on the economic investment of different candidate boundaries on the monitoring and reinforcement of potential landslide bodies according to the metering and pricing rule and the safety cost formula, and updating the project net present value NPV; and selecting the boundary with the largest net present value as the final boundary of the mine by comparing different candidate boundaries, thereby realizing the economical-safe efficient mining of the surface mine.
Step 5.1: carrying out safety cost accounting on the economic investment of different candidate boundaries designed in the step 4 on the potential landslide body monitoring and reinforcement according to the metering rule and the safety cost formula in the step 3;
step 5.2: and updating the net present value NPV of the surface mine, selecting the boundary with the largest net present value from different candidate boundaries as the final boundary of the mine, and selecting the boundary with the optimal safety-economic benefit from different candidate boundaries.
Wherein: NCF (NCF) j For net cash flow occurring at the end of the j-th year, C MS,j For the last year of jAnd monitoring equipment and slope reinforcement safety cost, wherein d is a selected fund discount rate, and n is project life.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in:
the invention provides a strip mine safety cost accounting and boundary optimizing method based on a refined model, which quantifies the safety cost of monitoring and reinforcing the side slope of the strip mine, and the strip mine safety cost accounting and boundary optimizing method is incorporated into the optimization of the final boundary of the strip mine, so that the economic-safety integration of the strip mining is finally realized. For an open mine, the safety cost investment is used for guaranteeing the life safety and health of people, preventing landslide disasters, and guaranteeing normal production so as to improve economic benefits of enterprises. The safety cost investment ensures the production data and the production environment, thereby improving the economic benefit of enterprises, making a reasonable safety cost accounting method, designing the open-air final boundary considering the safety and the economic cost, effectively reducing the occurrence of slope safety accidents, reducing the economic loss and improving the cost management level. In addition, the method can provide reference for the final boundary design of the surface mine, and is beneficial to economically and reasonably planning mineral resource development.
Drawings
FIG. 1 is a flowchart of a method for managing and optimizing the safe cost and boundaries of strip mines according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a quality characterization model of refined rock mass of an open-pit mine in an embodiment of the invention;
fig. 3 is a schematic diagram of an open mine safety cost composition in an embodiment of the present invention.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
A strip mine safety cost accounting and boundary optimizing method based on a refined model is shown in fig. 1, and comprises the following steps:
step 1: determining a geological strength index GSI sample value through a rock quality index RQD and joint distribution, and establishing a surface mine refined rock mass quality characterization model by using mine modeling software, as shown in figure 2;
the method comprises the steps of establishing a mine digital ground model through unmanned aerial vehicle oblique photogrammetry, calculating rock quality index RQD through drilling rock cores, and determining rock mass structure types through joint distribution of unmanned aerial vehicle photographic side slope surfaces. Determining a geological strength index GSI sample value by combining the rock mass structure type and the structural surface condition; carrying out geospatial variability statistics and geological strength index attribute interpolation by adopting a geostatistical principle in mine modeling software 3Dmine, thereby establishing a surface mine refined rock mass characterization model from the outside to the inside;
step 2: based on an open mine refined rock mass quality representation model, combining a geological strength index GSI and a rock mechanics index, calculating rock mechanics parameters by applying a geostatistical method and combining a Hoek-Brown criterion, and establishing a rock physical mechanics parameter representation space variability block model; generating grids by using a rock physical and mechanical parameter space variability block model through a grid dividing program by adopting a three-dimensional mapping method, importing the grids into numerical simulation software through a data interface, and endowing parameters to each grid unit to obtain a refined mechanical parameter numerical simulation model;
step 3: establishing a safety cost accounting formula of the surface mine monitoring equipment and the reinforcement means, providing a safety cost component part of the surface mine, as shown in fig. 3, and establishing a metering and pricing rule method of the surface mine for the slope monitoring equipment and the reinforcement means;
step 3.1: in order to calculate the safety cost of the surface mine monitoring equipment and the reinforcement means, a safety cost calculation formula of the surface mine monitoring equipment and the reinforcement means is established, namely according to the cost C of the monitoring equipment ME Cost of slope reinforcement C SR Post maintenance update cost C MA Calculating the monitoring and reinforcing safety cost of the surface mine;
wherein the surface mine monitors and consolidates the safety cost C MS The calculation formula of (2) is as follows:
C MS ＝C ME +C SR +C MA (1)
wherein: c (C) MS Represents the safety cost of the surface mine, C ME Representing the cost of monitoring equipment, the cost of purchasing and installing slope monitoring equipment includes but is not limited to the price of the equipment, installation cost, debugging cost and the like; c (C) SR Representing slope reinforcement costs, which refers to costs required to reinforce a slope, including but not limited to engineering material costs, labor costs, and machinery costs; c (C) MA Representing maintenance and update costs, refers to the costs required to maintain and update the slope monitoring equipment and reinforcement means, including, but not limited to, daily maintenance and overhaul costs, equipment update technical service costs, and the like.
Step 3.2: establishing an open mine slope monitoring reinforcement engineering quantity metering rule and a comprehensive unit price metering rule according to the risk area, and respectively calculating the cost of monitoring equipment, the slope reinforcement cost and the maintenance and update cost;
the monitoring equipment cost C ME Cost of slope reinforcement C SR Post maintenance update cost C MA The engineering quantity and the comprehensive unit price are respectively determined, and the method specifically comprises the following steps:
C ME ＝∑N me，i ·C cp，i (2)
C SR ＝∑N sr，j ·C cp，j (3)
C MA ＝∑(C h ·T+P u ) (4)
wherein: n (N) me，i The unit of the monitoring engineering quantity is that of the ith monitoring equipment is that of one, m and m 2 、m 3 Specifically, the method is determined according to different devices; c (C) cp，i The unit is meta/per, meta/m for the comprehensive unit price of the ith monitoring equipment 2 Meta/m 3 Specifically, the method is determined according to different devices; n (N) sr，j The engineering quantity of the j-th reinforcement measure is expressed as m 2 、m 3 Specifically, the method is determined according to reinforcement measures; c (C) cp，j The unit of the j-th reinforcement measure is meta/m 2 Meta/m 3 ；C h The unit of the labor hour cost required for maintenance or update is meta/h; t is the time for maintenance and update, and the unit is h; p (P) u For replacement part price, units are elements/components.
Wherein the integrated unit price C of the surface mine for the ith monitoring device is calculated cp，i The method of (2) is as follows:
C cp，i ＝C ep，i +C in.i +C de，i (2)
wherein C is ep，i The price of the ith monitoring equipment is given by the unit; c (C) in.i The installation cost of the ith monitoring equipment is given in units of units; c (C) de，i The debugging cost of the ith monitoring equipment is represented by the unit; the comprehensive unit price can also be adjusted according to the monitoring range.
Calculating comprehensive unit price C of surface mine aiming at j-th reinforcement measure cp，j The method of (2) is as follows:
C cp，j ＝C ma，j +C la，j +C me，j (3)
wherein C is ma，j Engineering material cost for the j-th reinforcement measure is given in units of elements; c (C) la，j The labor cost of the j-th reinforcement measure is given in units of elements; c (C) me，j The cost of the machine equipment for the j-th reinforcement measure is given in units of units.
The method for establishing the metering and pricing rule of the surface mine for slope monitoring equipment and reinforcing means comprises the following steps:
(1) Monitoring equipment engineering quantity calculation rules:
the monitoring equipment is mainly an important tool for ensuring the operation safety of the surface mine and preventing geological disasters such as slope landslide, and selects proper slope monitoring equipment according to the geological environment and the slope type of the surface mine, and is often under the combined action of multiple monitoring equipment in practical application.
Table 1 monitoring engineering quantity calculation rules
(2) Rule for calculating engineering quantity for reinforcing side slope
The slope reinforcement is in order to guarantee the slope stability in order to prevent geological disasters, and common slope reinforcement modes are: geosynthetic material reinforcement, reinforced concrete reinforcement, improved soil reinforcement, and the like. The selection of a proper slope reinforcement mode should be comprehensively considered according to specific terrain environments, engineering requirements, soil conditions and the like, so that the reinforcement effect is expected and the surrounding environment is not negatively influenced.
Table 2 rules for calculating the amount of reinforcement work on a side slope
Step 4: different candidate boundaries with the largest economic value are generated in boundary optimization software Whittle by changing the angle of the mine slope, numerical simulation is carried out by combining a numerical simulation model of the refined mechanical parameters, the size and the range of potential landslide bodies of the slopes with different candidate boundaries are determined, and equipment and a scheme for monitoring and reinforcing the slope stability are selected and formulated according to the size and the range;
step 4.1: generating different candidate boundaries by improving final slope angle parameters by using surface mine boundary optimization software Whittle;
step 4.2: and combining a numerical simulation model of the refined mechanical parameters, performing numerical simulation on the boundary slopes in numerical simulation software Flac3d, and determining the sizes and the ranges of potential landslide bodies of different candidate boundary slopes.
Step 4.3: and selecting and formulating equipment and a scheme for monitoring and reinforcing the slope stability according to the determined potential landslide area of the mine to be monitored and reinforced.
Step 5: carrying out safety cost accounting on the economic investment of different candidate boundaries on the monitoring and reinforcement of potential landslide bodies according to the metering and pricing rule and the safety cost formula, and updating the project net present value NPV; and selecting the boundary with the largest net present value as the final boundary of the mine by comparing different candidate boundaries, thereby realizing the economical-safe efficient mining of the surface mine.
Step 5.1: carrying out safety cost accounting on the economic investment of different candidate boundaries designed in the step 4 on the potential landslide body monitoring and reinforcement according to the metering rule and the safety cost formula in the step 3;
step 5.2: and updating the net present value NPV of the surface mine, selecting the boundary with the largest net present value from different candidate boundaries as the final boundary of the mine, and selecting the boundary with the optimal safety-economic benefit from different candidate boundaries.
Wherein: NCF (NCF) j Net cash flow in units of elements for the occurrence of the end of the j-th year; c (C) MS，j The safety cost is reinforced for monitoring equipment and side slope input at the end of the j-th year, and the unit is yuan; d is the selected fund discount rate, and the unit is 1; n is project life in years.
The foregoing description is only of the preferred embodiments of the present disclosure and description of the principles of the technology being employed. It will be appreciated by those skilled in the art that the scope of the invention in the embodiments of the present disclosure is not limited to the specific combination of the above technical features, but encompasses other technical features formed by any combination of the above technical features or their equivalents without departing from the spirit of the invention. Such as the above-described features, are mutually substituted with (but not limited to) the features having similar functions disclosed in the embodiments of the present disclosure.
Claims (7)
1. The optimization method for the safety cost accounting and the boundary of the strip mine based on the refined model is characterized by comprising the following steps of:
step 1: determining a geological strength index GSI sample value through a rock quality index RQD and joint distribution, and establishing a surface mine refined rock mass quality representation model by using mine modeling software;
step 2: based on an open mine refined rock mass quality representation model, combining a geological strength index GSI and a rock mechanics index, calculating rock mechanics parameters by applying a geostatistical method and combining a Hoek-Brown criterion, and establishing a rock physical mechanics parameter representation space variability block model; generating grids by using a rock physical and mechanical parameter space variability block model through a grid dividing program by adopting a three-dimensional mapping method, importing the grids into numerical simulation software through a data interface, and endowing parameters to each grid unit to obtain a refined mechanical parameter numerical simulation model;
step 3: establishing a safety cost accounting formula of surface mine monitoring equipment and reinforcing means, and establishing a metering and pricing rule method of the surface mine for slope monitoring equipment and reinforcing means;
step 4: different candidate boundaries with the largest economic value are generated in boundary optimization software Whittle by changing the angle of the mine slope, numerical simulation is carried out by combining a numerical simulation model of the refined mechanical parameters, the size and the range of potential landslide bodies of the slopes with different candidate boundaries are determined, and equipment and a scheme for monitoring and reinforcing the slope stability are selected and formulated according to the size and the range;
step 5: carrying out safety cost accounting on the economic investment of different candidate boundaries on the monitoring and reinforcement of potential landslide bodies according to the metering and pricing rule and the safety cost formula, and updating the project net present value NPV; and selecting the boundary with the largest net present value as the final boundary of the mine by comparing different candidate boundaries, thereby realizing the economical-safe efficient mining of the surface mine.
2. The method for security cost accounting and boundary optimization based on refined model strip mine according to claim 1, wherein the step 1 is specifically that a mine digital ground model is built through unmanned aerial vehicle oblique photogrammetry, rock quality index RQD is calculated through drilling cores, and rock structure type is determined through joint distribution of unmanned aerial vehicle photographic side slope surfaces; determining a geological strength index GSI sample value by combining the rock mass structure type and the structural surface condition; and carrying out geospatial variability statistics and geological strength index attribute interpolation by adopting a geostatistical principle in the mine modeling software 3Dmine, thereby establishing a surface mine refined rock mass characterization model from the outside to the inside.
3. The optimization method of the security cost accounting and the boundary of the strip mine based on the refined model according to claim 1, wherein the step 3 specifically comprises the following steps:
step 3.1: in order to calculate the safety cost of the surface mine monitoring equipment and the reinforcement means, a safety cost calculation formula of the surface mine monitoring equipment and the reinforcement means is established, namely according to the cost C of the monitoring equipment ME Cost of slope reinforcement C SR Post maintenance update cost C MA Calculating the monitoring and reinforcing safety cost of the surface mine;
wherein the surface mine monitors and consolidates the safety cost C MS The calculation formula of (2) is as follows:
C MS ＝C ME +C SR +C MA (1)
step 3.2: establishing an open mine slope monitoring reinforcement engineering quantity metering rule and a comprehensive unit price metering rule according to the risk area, and respectively calculating the cost of monitoring equipment, the slope reinforcement cost and the maintenance and update cost;
the monitoring equipment cost C ME Cost of slope reinforcement C SR Post maintenance update cost C MA The engineering quantity and the comprehensive unit price are respectively determined, and the method specifically comprises the following steps:
C ME ＝∑N me，i ·C cp，i (2)
C SR ＝∑N sr，j ·C cp，j (3)
C MA ＝∑(C h ·T+P u ) (4)
wherein: n (N) me，i Monitoring engineering quantity for ith monitoring equipment, C cp，i For the comprehensive unit price of the ith monitoring equipment, N sr，j Engineering quantity of j-th reinforcement measure, C cp，j For the comprehensive unit price of the j-th reinforcement measure, C h The cost of man-hours required for maintenance or update is T for maintenance and updateTime, P of (2) u Price for the replacement parts;
wherein the integrated unit price C of the surface mine for the ith monitoring device is calculated cp，i The method of (2) is as follows:
C cp，i ＝C ep，i +C in.i +C de，i (2)
wherein C is ep，i The equipment price of the ith monitoring equipment, C in.i For the installation cost of the ith monitoring equipment, C de，i The debugging cost for the ith monitoring equipment;
calculating comprehensive unit price C of surface mine aiming at j-th reinforcement measure cp，j The method of (2) is as follows:
C cp，j ＝C ma，j +C la，j +C me，j (3)
wherein C is ma，j Engineering material costs for the j-th reinforcement, C la，j For the labor cost of the j-th reinforcement measure, C me，j The cost of the machine equipment for the j-th reinforcement measure.
4. The method for calculating the safety cost and optimizing the boundaries of the strip mine based on the refined model according to claim 1, wherein the method for establishing the metering and pricing rules of the strip mine for slope monitoring equipment and reinforcement means in the step 3 is specifically as follows:
(1) Monitoring equipment engineering quantity calculation rules:
table 1 monitoring engineering quantity calculation rules
(2) Metering and pricing rules of the engineering quantity of slope reinforcement:
TABLE 2 metering and pricing rules for slope reinforcement engineering quantity
The metering and pricing rule method of the surface mine for slope monitoring equipment and reinforcement means is obtained.
5. The optimization method of the security cost accounting and the boundary of the strip mine based on the refined model according to claim 1, wherein the step 4 specifically comprises the following steps:
step 4.1: generating different candidate boundaries by improving final slope angle parameters by using surface mine boundary optimization software Whittle;
step 4.2: combining with a refined mechanical parameter numerical simulation model, performing numerical simulation on the boundary slopes in numerical simulation software Flac3d, and determining the sizes and the ranges of potential landslide bodies of different candidate boundary slopes;
step 4.3: and selecting and formulating equipment and a scheme for monitoring and reinforcing the slope stability according to the determined potential landslide area of the mine to be monitored and reinforced.
6. The optimization method of the security cost accounting and the boundary of the strip mine based on the refined model according to claim 1, wherein the step 5 specifically comprises the following steps:
step 5.1: carrying out safety cost accounting on the economic investment of different candidate boundaries designed in the step 4 on the potential landslide body monitoring and reinforcement according to the metering rule and the safety cost formula in the step 3;
step 5.2: and updating the net present value NPV of the surface mine, selecting the boundary with the largest net present value from different candidate boundaries as the final boundary of the mine, and selecting the boundary with the optimal safety-economic benefit from different candidate boundaries.
7. The refined model-based strip mine safety cost accounting and boundary optimization method as claimed in claim 6, wherein the strip mine net present value NPV is calculated as follows:
wherein: NCF (NCF) j For net cash flow occurring at the end of the j-th year, C MS，j The safety cost is reinforced for monitoring equipment and side slope input at the end of the j-th year, d is the selected fund discount rate, and n is the project life.
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