Stope structure stability calculation method based on fluorite underground mine shallow hole shrinkage method

Abstract

The invention relates to the technical field of metal and non-metal mine engineering, in particular to a stope structure stability calculation method based on a fluorite underground mine shallow hole shrinkage method, and the method comprises the following steps: obtaining stope structure parameters of the shallow hole shrinkage method; analyzing the stope structure parameters, and determining stope pillar strength and stope pillar average stress of a shallow hole shrinkage method; determining a stope structure stability coefficient according to the stope pillar strength and the stope pillar average stress; and comparing the stope structure stability coefficient with an allowable safety coefficient, and determining whether stope structure parameters meet stope structure stability requirements or not. According to the method, the stope structure parameters are reasonably selected by calculating the stope structure stability coefficient, and meanwhile safety production and economic benefits are considered.

Description

Technical Field

[0001] The invention relates to the technical field of metal and nonmetal mine engineering, and in particular to a method for calculating the stability of a stope structure based on a shallow hole ore retention method in a fluorite underground mine. Background Art

[0002] At present, the shallow hole ore retention method is basically used as the main mining method for thin-medium-thick ore bodies in domestic production of fluorite, and the goaf is subsequently cemented and filled after the mining is completed. This method has the advantages of mature technology, short mining time, and less working hours. It is used for mining in mines with an average thickness of less than 3m, which can greatly improve production efficiency and reduce the time workers are exposed to dangerous environments.

[0003] Then, the calculation method of the stope structure parameters of the shallow hole ore retention method is not clearly defined in the current domestic relevant specifications, regulations and mining design manuals, and the stope structure parameters are usually determined by empirical methods. Then, under different ore body occurrences, ground pressures and mining technical geological conditions, the stope structure parameters determined by empirical methods are difficult to strike a balance between safety and economy. If the stope structure parameters are too conservative, it will cause greater economic losses and waste of resources. If the stope structure parameters are too radical, it will cause safety hazards in production. Summary of the invention

[0004] The purpose of the present invention is to provide a method for calculating the stability of stope structure based on a shallow hole ore retention method in a fluorite underground mine, so as to solve the problem that the stope structure parameters are not accurately determined by empirical methods in the existing shallow hole ore retention method.

[0005] In order to solve the above technical problems, in a first aspect, the present invention provides a method for calculating the stability of a stope structure based on a shallow hole ore retention method in a fluorite underground mine, comprising the following steps:

[0006] Obtain the stope structure parameters of the shallow hole ore retention method;

[0007] Performing data processing on the stope structural parameters to determine the stope pillar strength and the stope pillar average stress of the shallow hole ore retention method;

[0008] Determining a stope structure stability coefficient according to the stope pillar strength and the stope pillar average stress;

[0009] The stope structure stability coefficient is compared with the allowable safety factor to determine whether the stope structure parameters meet the stope structure stability requirements.

[0010] In combination with the first aspect above, in some possible implementations, the stope structure parameters include at least: ore rock strength parameters, top pillar height, intermediate pillar width, and ore pillar height.

[0011] In combination with the first aspect above, in some possible implementations, the pillar strength of the stope of the shallow hole ore retention method is determined, and the corresponding calculation formula is:

[0012]

[0013] Among them, S P Indicates the pillar strength of the stope in the shallow hole ore retention method; σ C Indicates the rock strength parameter; W P represents the width of the pillar, which is obtained by averaging the height of the top pillar and the width of the intermediate pillars; h represents the height of the pillar; a represents a calculation constant, which is determined according to the aspect ratio of the pillar.

[0014] In combination with the first aspect above, in some possible implementations, if the aspect ratio of the pillar is greater than 5, the value of the calculation constant a is 1.4; if the aspect ratio of the pillar is less than or equal to 5, the value of the calculation constant a is 1.

[0015] In combination with the first aspect above, in some possible implementations, the stope structure parameters further include: mine room length, mine room height, ore body inclination, overlying rock density and mining height.

[0016] In combination with the first aspect above, in some possible implementations, the average stress of the stope pillars of the shallow hole ore retention method is determined, and the corresponding calculation formula is:

[0017]

[0018] Among them, σ P A represents the average stress of the stope pillars in the shallow hole ore retention method; P A represents the area of ​​the mine room, which is calculated from the length of the mine room, the height of the mine room, the width of the pillar and the inclination of the ore body; S It represents the area of ​​the pillar, which is calculated by the length of the mine room, the height of the mine room, the height of the top pillar, the width of the intermediate pillars and the inclination of the ore body; γ represents the bulk density of the overlying rock strata; H represents the mining height.

[0019] In combination with the first aspect above, in some possible implementations, determining the stope structure stability coefficient includes:

[0020] The ratio of the stope pillar strength to the stope pillar average stress is determined, and the ratio is determined as the stope structure stability coefficient.

[0021] In combination with the first aspect above, in some possible implementations, determining whether the stope structure parameters meet the stope structure stability requirements includes:

[0022] If the stope structure stability coefficient is greater than the allowable safety factor, and the difference between the stope structure stability coefficient and the allowable safety factor is less than a set threshold, it is determined that the stope structure parameters meet the stope structure stability requirements.

[0023] In combination with the above-mentioned first aspect, in some possible implementations, the value of the allowable safety factor is 1.5.

[0024] In combination with the above-mentioned first aspect, in some possible implementations, the value of the set threshold is 0.1.

[0025] In order to solve the above technical problems, in a second aspect, the present invention also provides a stope structure stability calculation device based on a shallow hole ore retention method in a fluorite underground mine, the device comprising:

[0026] Parameter acquisition module, used to obtain the stope structure parameters of the shallow hole ore retention method;

[0027] A data processing module is used to process the stope structural parameters to determine the stope pillar strength and the stope pillar average stress of the shallow hole ore retention method;

[0028] A stability coefficient acquisition module, used to determine the stope structure stability coefficient according to the stope pillar strength and the stope pillar average stress;

[0029] The evaluation module is used to compare the stope structure stability coefficient with the allowable safety factor to determine whether the stope structure parameters meet the stope structure stability requirements.

[0030] To solve the above technical problems, in a third aspect, the present invention also provides a stope structure stability calculation system based on a shallow hole ore retention method in a fluorite underground mine, comprising a memory and a processor. The memory is used to store executable program code, and the processor is used to call and run the executable program code from the memory, so that the device executes the method in the above first aspect or any possible implementation of the first aspect.

[0031] To solve the above technical problems, in a fourth aspect, the present invention further provides a computer program product, which includes: a computer program code, when the computer program code runs on a computer, enables the computer to execute the method in the above first aspect or any possible implementation of the first aspect.

[0032] To solve the above technical problems, in a fifth aspect, the present invention further provides a computer-readable storage medium, which stores a computer program code. When the computer program code runs on a computer, the computer executes the method in the above first aspect or any possible implementation of the first aspect.

[0033] The present invention has the following beneficial effects: the present invention calculates the stope structure stability coefficient for the stope structure parameters of the shallow hole ore retention method selected by the empirical method, and compares the stope structure stability coefficient with the allowable safety factor to determine whether the stope structure parameters meet the stope structure stability requirements, thereby selecting reasonable stope structure parameters of the shallow hole ore retention method, improving the recovery rate while ensuring safe production, thereby achieving the effect of reducing safety accidents and improving economic efficiency and resource utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A flowchart of the steps of a method for calculating the stability of a stope structure based on a shallow hole ore retention method in a fluorite underground mine according to an embodiment of the present invention;

[0036] Figure 2 It is a front view of a stope structure of a bottom-pillar-free shallow-hole ore-retaining method according to an embodiment of the present invention;

[0037] Figure 3 A top view of a stope structure of a bottomless shallow hole ore retention method according to an embodiment of the present invention;

[0038] Figure 4 It is a side view of the stope structure of the bottomless shallow hole ore retention method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to clearly illustrate the technical features of the present invention, the present invention is described in detail below through specific implementation methods in conjunction with the accompanying drawings.

[0040] Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein, which are instead provided for a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0041] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. In addition, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0042] The term "including" and its variations used herein are open inclusions, i.e., "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the following description.

[0043] It should be noted that the concepts such as "first" and "second" mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0044] Although operations or steps are described in a specific order in the drawings in the embodiments of the present invention, it should not be understood that it is required to perform these operations or steps in the specific order shown or in a serial order, or that all the operations or steps shown must be performed to obtain the desired results. In the embodiments of the present invention, these operations or steps may be performed in series; these operations or steps may also be performed in parallel; or some of these operations or steps may be performed.

[0045] At the same time, it is understood that the data involved in the technical solution of the present invention (including but not limited to the data itself, the acquisition or use of the data) shall comply with the requirements of the relevant laws, regulations and relevant provisions. Unless otherwise defined, all technical and scientific terms used in the present invention have the same meanings as those generally understood by technicians in the technical field of the present invention, and all parameters or indicators in the formulas involved in the present invention are normalized values ​​that eliminate the influence of dimensions.

[0046] In order to solve the problem that the mine structure parameters determined by the empirical method in the existing shallow hole ore retention method are not accurate enough, making it difficult to achieve a balance between safe production and economic benefits, an embodiment of the present invention provides a method for calculating the stability of the mine structure based on the shallow hole ore retention method of fluorite underground mines. The method calculates the mine structure stability coefficient of the mine structure parameters of the shallow hole ore retention method selected by the empirical method, and compares the mine structure stability coefficient with the allowable safety factor to determine whether the mine structure parameters meet the mine structure stability requirements, thereby selecting reasonable mine structure parameters of the shallow hole ore retention method, improving the recovery rate while ensuring safe production, thereby reducing safety accidents and improving economic efficiency and resource utilization.

[0047] A method for calculating the stability of a stope structure based on a shallow hole ore retention method in a fluorite underground mine provided by an embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0048] Figure 1FIG. 1 is a schematic diagram showing a basic flow chart of a method for calculating the stability of a stope structure based on a shallow hole ore retention method in a fluorite underground mine provided by an embodiment of the present invention. Figure 1 As shown, the method specifically comprises the following steps:

[0049] Step S100: Obtaining the stope structure parameters of the shallow hole ore retention method.

[0050] When designing a mining project, if you want to meet the mining process and safety requirements and recycle resources as much as possible, the key is to design reasonable ore block parameters. The main parameters of the shallow hole ore retention stope structure are the length of the mine room, the middle section height, the top pillar height, the thickness of the intermediate pillar, the bottom pillar height, etc. In the prior art, the stope structure parameters are usually determined by empirical methods. However, due to the differences in the occurrence of ore bodies, ground pressure and mining technology geological conditions in various mines, the shallow hole ore retention stope structure parameters determined by empirical methods are difficult to achieve a balance between safe production and economic benefits.

[0051] After studying the stope structure of the shallow hole ore retention method, it was found that the solution to this defect can be achieved by calculating the stability coefficient of the stope structure of the shallow hole ore retention method, and then using the allowable coefficient method to evaluate the stability of the stope structure, so as to finally select reasonable stope structure parameters.

[0052] To this end, the stope structure parameters of the shallow hole ore retention method are obtained, and the obtained stope structure parameters at least include ore rock strength parameters, top pillar height, intermediate pillar width, ore pillar height, mine room length, mine room height, ore body inclination, overburden density and mining height.

[0053] Step S200: performing data processing on the stope structural parameters to determine the stope pillar strength and the stope pillar average stress of the shallow hole ore retention method.

[0054] Based on the stope structural parameters obtained above, the pillar strength formula recommended by Bieniawski, which is widely used, is used to determine the stope pillar strength of the shallow hole ore retention method. The corresponding calculation formula is:

[0055]

[0056] Among them, S P It indicates the pillar strength of the stope in the shallow hole ore retention method, in MPa; σ C Indicates the strength parameter of ore and rock, the unit is MPa; W P It represents the width of the pillar in m, which is obtained by taking the average of the top pillar height and the intermediate pillar width; h represents the height of the pillar in m; a represents the calculation constant, which is determined according to the aspect ratio of the pillar. If the aspect ratio of the pillar is greater than 5, the value of the calculation constant a is 1.4; if the aspect ratio of the pillar is less than or equal to 5, the value of the calculation constant a is 1.

[0057] By using the above calculation formula for the strength of stope pillars, the strength of stope pillars of the shallow hole ore retention method can be calculated relatively simply and reliably.

[0058] At the same time, based on the stope structural parameters obtained above and according to the area bearing theory, the average stress of the stope pillars of the shallow hole ore retention method is determined, and the corresponding calculation formula is:

[0059]

[0060] Among them, σ P It represents the average stress of the stope pillars in the hole-leaving ore method, in MPa; A P Indicates the area of ​​the mine room, in m 2 , calculated from the length of the mine room, the height of the mine room, the height of the top pillar, the width of the intermediate pillars and the inclination of the ore body, that is, the area of ​​the mine room A P＝ ((length of the mine room - width of the intermediate pillar) × (height of the mine room - height of the top pillar)) ÷ sin ore body inclination; A S Indicates the area of ​​the pillar, in m 2 , calculated from the length of the mine room, the height of the mine room, the height of the top pillar, the width of the intermediate pillars and the inclination of the ore body, that is, the area of ​​the pillar A S＝ (length of chamber × height of top pillar) + ((height of chamber – height of top pillar) × width of intermediate pillar)) ÷ sin ore body inclination; γ represents the bulk density of overlying strata, unit is kN·m -3 ; H represents the mining height, the unit is m.

[0061] By using the above calculation formula for the average stress of the stope pillars, the gravity of the overlying rock strata supported by the stope pillars of the shallow hole ore retention method, that is, the average stress of the stope pillars, can be calculated relatively simply and reliably.

[0062] Step S300: Determine the stope structure stability coefficient according to the stope pillar strength and the stope pillar average stress.

[0063] Determine the ratio of the stope pillar strength to the stope pillar average stress, and then obtain the stope structure stability coefficient. The corresponding calculation formula is:

[0064]

[0065] Among them, K represents the stability coefficient of the stope structure; S P It indicates the pillar strength of the stope in the shallow hole ore retention method, in MPa; σ P It represents the average stress of the pillars in the stope of the hole-leaving ore method, in MPa.

[0066] By using the above calculation formula for the stope structure stability coefficient, the stope structure stability coefficient of the shallow hole ore retention method can be calculated relatively simply and reliably.

[0067] Step S400: Compare the stope structure stability coefficient with the allowable safety factor to determine whether the stope structure parameters meet the stope structure stability requirements.

[0068] The stope structure stability coefficient is calculated through the above-mentioned calculation of the stope structure parameters selected by the empirical method, and the reasonable stope structure parameters of the shallow hole ore retention method can be selected through the allowable safety factor, so as to improve the recovery rate while ensuring safe production, thereby achieving the effect of reducing safety accidents, improving economic efficiency and resource utilization.

[0069] According to the mine design, the flat-bottom structure shallow hole ore retention method is completed and then backfilled, and its allowable safety factor is 1.5. The obtained stope structure stability coefficient K is compared with the safety factor 1.5. If the stope structure stability coefficient K is greater than the allowable safety factor 1.5, and the difference between the stope structure stability coefficient and the allowable safety factor 1.5 is less than the set threshold, it means that the stope structure parameters meet the stope structure stability requirements. The set threshold can be reasonably set as needed, for example, the set threshold value can be set to 0.1.

[0070] As an example, the No. 3 ore body of a fluorite mine is produced in a fault zone, with an elevation of +390m to +590m and a maximum burial depth of 300m. The ore body is vein-like, with an overall occurrence of 338° to 358°∠50°. The ore body thickness is 1.05 to 9.92m, with an average thickness of 5.05m, and the thickness variation is relatively stable. 2 Highest grade 79.40%, single engineering CaF 2 The highest grade is 54.74%, the average grade is 43.5%, the grade variation coefficient is 20.87%, and the grade variation is of uniform type.

[0071] The complexity of the mine engineering geological conditions is of medium type; the surrounding rock of the ore body roof is granite, gneiss, tuff, the rock mass quality is excellent to medium (I-III), and the rock mass bulk density is 27.6kN·m -3 ; The ore body quality is medium (III), and the saturated compressive strength is 57.6~68.67MPa.

[0072] The mine is designed to carry out recovery (subsequent filling) mainly by upward horizontal layered cementation filling method and supplemented by flat bottom structure shallow hole ore retention method. When the average thickness of the ore block is greater than 3m, the upward horizontal layered cementation filling method is adopted. When the average thickness of the ore block is less than 3m, the flat bottom structure shallow hole ore retention method is adopted (the goaf is subsequently cemented and filled).

[0073] The structural parameters of the flat-bottom structure shallow hole ore-retaining method mining area are determined according to the empirical method. The standard mine room is arranged along the strike, with a mine room length of ①40m; the mine room width is the ore body thickness ⑤3m (the maximum value), and the mine room height is the middle section height ③35m; the top pillar height is ④3m; the intermediate pillar width is ②3m; no bottom pillar is left.

[0074] Figure 2 The front view of the stope structure with shallow hole ore retention method without bottom pillar is shown. The main structural parameters of the stope with shallow hole ore retention method are the length of the mine room①, the width of the intermediate pillar②, the height of the middle section③, and the height of the top pillar④; Figure 3 The top view of the stope structure of the shallow hole ore retention method without bottom pillars is shown. The main structural parameters of the stope with the shallow hole ore retention method are the length of the mine room① and the width of the pillar②. Figure 4 The side view of the stope structure of the shallow hole ore retention method without bottom pillar is shown. The main structural parameters of the stope with the shallow hole ore retention method are the middle section height ③, the top pillar height ④, and the ore body thickness ⑤.

[0075] Based on this, the pillar strength of the stope in the shallow hole ore retention method in this example is:

[0076]

[0077] Among them, S P It indicates the pillar strength of the stope in the shallow hole ore retention method, in MPa; σ C Indicates the strength parameter of ore and rock, the unit is MPa; W P It represents the width of the pillar in m, with the top pillar height being ④3m, the intermediate pillar width being ②3m, and the average being 3m; h represents the height of the pillar in m, with the thickness of the ore body being ⑤3m; a represents the calculation constant, and when the aspect ratio of the pillar is less than 5m, a is taken as 1.0.

[0078] The average stress of the stope pillars in the shallow hole ore retention method in this example is:

[0079]

[0080] Among them, σ P It represents the average stress of the stope pillars in the hole-leaving ore method, in MPa; A P Indicates the area of ​​the mine room, in m 2 , after calculation, the length of the mine room ① is 40m, the height of the mine room ③ is 35m, and the horizontal projection area of ​​the mine room is A according to the ore body inclination of 50° P = The horizontal projection area of ​​the block is 1175m 2 -Horizontal projection area of ​​the pillar A S =913m 2 ; A S Indicates the area of ​​the pillar, in m 2, the length of the mine room is ①40m, the height of the mine room is ③35m, the width of the pillar is 3m, and the inclination of the ore body is 50°. After calculation, the horizontal projection area is 262m 2 ; γ represents the bulk density of the overlying rock layer, in kN·m -3 , the value is 27.6kN·m -3 ; H represents the mining height, the unit is m, and the maximum mining depth is 300m.

[0081] The stope structure stability coefficient of the shallow hole ore retention method in this example is:

[0082]

[0083] Among them, K represents the stability coefficient of the stope structure; S P It represents the pillar strength of the shallow hole ore retention method, in MPa, with a value of 57.6 / MPa; P It represents the average stress of the pillars in the stope of the hole-leaving ore method, in MPa, and its value is 37.1 / MPa.

[0084] Compare the obtained mining field structure stability coefficient K with the safety factor 1.5. At this time, K=1.55>1.5. This means that the mining field structure of the mine with flat bottom structure and shallow hole ore retention method is stable, and its mining field structure stability coefficient is closer to the allowable coefficient 1.5, and its resource utilization rate and economic benefits are good.

[0085] Based on the same inventive concept, an embodiment of the present invention further provides a stope structure stability calculation device based on a shallow hole ore retention method in a fluorite underground mine, the device comprising:

[0086] Parameter acquisition module, used to obtain the stope structure parameters of the shallow hole ore retention method;

[0087] A data processing module is used to process the stope structural parameters to determine the stope pillar strength and the stope pillar average stress of the shallow hole ore retention method;

[0088] A stability coefficient acquisition module, used to determine the stope structure stability coefficient according to the stope pillar strength and the stope pillar average stress;

[0089] The evaluation module is used to compare the stope structure stability coefficient with the allowable safety factor to determine whether the stope structure parameters meet the stope structure stability requirements.

[0090] It should be noted that the device provided in the above embodiment is only illustrated by the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the computer device can be divided into different functional modules to complete all or part of the functions described above.

[0091] Based on the same inventive concept, an embodiment of the present invention also provides a system for calculating the stability of a mine structure based on the shallow hole ore retention method in a fluorite underground mine. The system includes: a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, the system can execute any one of the aforementioned methods for calculating the stability of a mine structure based on the shallow hole ore retention method in a fluorite underground mine.

[0092] The embodiment of the present invention can divide the system into functional modules according to the above method example. For example, each functional module can be corresponded to, or two or more functions can be integrated into one processing module. The above integrated module can be implemented in the form of hardware. It should be noted that the division of modules in this embodiment is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0093] Based on the same inventive concept, an embodiment of the present invention also provides a computer program product, which includes: computer program code, when the computer program code runs on a computer, the computer executes any one of the aforementioned methods for calculating the stability of the stope structure based on the shallow hole ore retention method in a fluorite underground mine.

[0094] Based on the same inventive concept, an embodiment of the present invention also provides a computer-readable storage medium, which stores a computer program code. When the computer program code runs on a computer, the computer executes any one of the aforementioned methods for calculating the stability of the mining area based on the shallow hole ore retention method in a fluorite underground mine.

[0095] It should be noted that the above-described embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A method for calculating the stability of stope structure based on the shallow hole ore retention method in fluorite underground mines, characterized in that: The following steps are involved: Obtain the stope structure parameters of the shallow hole ore retention method; Performing data processing on the stope structural parameters to determine the stope pillar strength and the stope pillar average stress of the shallow hole ore retention method; Determining a stope structure stability coefficient according to the stope pillar strength and the stope pillar average stress; The stope structure stability coefficient is compared with the allowable safety factor to determine whether the stope structure parameters meet the stope structure stability requirements.

2. The method for calculating the stability of stope structure based on the shallow hole ore retention method in fluorite underground mines according to claim 1 is characterized in that: The stope structure parameters include at least: ore rock strength parameters, top pillar height, intermediate pillar width, and ore pillar height.

3. The method for calculating the stability of stope structure based on the shallow hole ore retention method in fluorite underground mines according to claim 2 is characterized in that: To determine the pillar strength of the shallow hole ore retention method, the corresponding calculation formula is: Among them, S P Indicates the pillar strength of the shallow hole ore retention method; σ C Indicates the strength parameter of ore and rock; W P represents the width of the pillar, which is obtained by averaging the height of the top pillar and the width of the intermediate pillars; h represents the height of the pillar; a represents a calculation constant, which is determined according to the aspect ratio of the pillar.

4. The method for calculating the stability of stope structure based on the shallow hole ore retention method in fluorite underground mines according to claim 3 is characterized in that: If the aspect ratio of the pillar is greater than 5, the value of the calculation constant a is 1.4; if the aspect ratio of the pillar is less than or equal to 5, the value of the calculation constant a is 1.

5. The method for calculating the stability of stope structure based on the shallow hole ore retention method in fluorite underground mines according to claim 2, characterized in that: The stope structural parameters also include: mine chamber length, mine chamber height, ore body inclination, overlying rock stratum bulk density and mining height.

6. The method for calculating the stability of stope structure based on the shallow hole ore retention method in fluorite underground mines according to claim 5 is characterized in that: Determine the average stress of the stope pillars of the shallow hole ore retention method, and the corresponding calculation formula is: Among them, σ P A represents the average stress of the stope pillars in the shallow hole ore retention method; P A represents the area of ​​the mine room, which is calculated from the length of the mine room, the height of the mine room, the width of the pillar and the inclination of the ore body; S It represents the area of ​​the pillar, which is calculated by the length of the mine room, the height of the mine room, the height of the top pillar, the width of the intermediate pillars and the inclination of the ore body; γ represents the bulk density of the overlying rock strata; H represents the mining height.

7. The method for calculating the stability of stope structure based on the shallow hole ore retention method in fluorite underground mines according to claim 1 is characterized in that: Determine the stability coefficient of the stope structure, including: The ratio of the stope pillar strength to the stope pillar average stress is determined, and the ratio is determined as the stope structure stability coefficient.

8. The method for calculating the stability of stope structure based on the shallow hole ore retention method in fluorite underground mines according to claim 1 is characterized in that: Determine whether the stope structure parameters meet the stope structure stability requirements, including: If the stope structure stability coefficient is greater than the allowable safety factor, and the difference between the stope structure stability coefficient and the allowable safety factor is less than a set threshold, it is determined that the stope structure parameters meet the stope structure stability requirements.

9. The method for calculating the stability of stope structure based on the shallow hole ore retention method in a fluorite underground mine according to claim 1 or 8, characterized in that: The allowable safety factor is 1.

5.

10. The method for calculating the stability of stope structure based on the shallow hole ore retention method in fluorite underground mines according to claim 8, characterized in that: The set threshold value is 0.1.

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