Evaluation method of reasonable turnover empty area of metal mine based on empty area subsequent filling mining

Abstract

The application provides a reasonable turnover empty area evaluation method for a metal mine based on a room and pillar post-filling mining method, which is used for a metal mine adopting the room and pillar post-filling mining method, the ore drawing mode of which is sublevel or stage, and the post-filling, and comprises the following steps: determining the volume of the stope empty area and the number of the stope to be used; determining a production imbalance coefficient and a ratio coefficient of the number of the stope to be mined and the number of the stope to be filled; constructing a reasonable turnover empty area model, wherein the reasonable turnover empty area refers to a reasonable empty area volume when the mining and filling process of the room and pillar post-filling mining method is connected; and based on the reasonable turnover empty area model, the balance relationship between the mining and filling of the metal mine adopting the room and pillar post-filling mining method is evaluated. The reasonable turnover empty area model is established, which is beneficial to further analyzing the balance relationship between the mining and filling, and provides a scientific technical basis for analyzing the balance between the mining and filling of the empty area.

Description

Technical Field

[0001] This invention relates to the field of mining technology, and specifically to a method for evaluating the rational turnover of open areas in metal mines based on subsequent backfilling mining. Background Technology

[0002] Currently, metal mining technology is developing rapidly, continuously moving towards large-scale, mechanized, automated, and intelligent development. Metal mines are using various types of backfill mining methods to replace commonly used caving and open-pit mining methods. They are making full use of tailings from mining enterprises as underground backfill materials, minimizing the costs of tailings dam construction and maintenance, as well as the large land occupation and environmental pollution caused by tailings on the surface.

[0003] Metal mines still need further improvement in backfilling technology, backfilling materials, and backfilling quality monitoring. There are not many mines that use fine-grained tailings, whole tailings, and high-concentration paste for backfilling, and the basic backfilling technology needs to be deepened.

[0004] Current technologies do not adequately address the connection between mining and backfilling processes and the balance between mining and backfilling in segmented or staged stope-filling mining methods. A comprehensive concept of "reasonable turnover empty space" in segmented or staged stope-filling mining methods has not yet been established, and the volume of such "reasonable turnover empty space" cannot be reasonably calculated. This prevents mining companies using stope-filling mining methods from self-assessing their mining-backfilling balance, resulting in a lack of consideration in project design, safety pre-evaluation, and current safety assessment. Consequently, the safety management of goaf areas in mining companies using this method faces significant challenges, and mining regulatory authorities lack reliable grounds for oversight.

[0005] Therefore, how to provide a scientific evaluation method for the reasonable turnover of open areas in metal mines based on open area subsequent filling mining is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the present invention provides a scientific and technical basis for the analysis of the mining-supplement balance in goaf areas, so as to solve or alleviate the problems existing in the prior art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] This invention discloses a method for evaluating the rational turnover vault area in metal mines based on subsequent backfilling mining, comprising the following steps:

[0009] A method for evaluating the rational turnover of open areas in metal mines based on subsequent backfilling mining, applicable to metal mines employing subsequent backfilling where the ore extraction method is segmented or staged, and subsequent backfilling is carried out, includes the following steps:

[0010] S1. Determine the volume of the goaf and the number of mining areas to be used;

[0011] S2. Determine the production imbalance coefficient and the ratio coefficient between the number of mining and backfilling mining areas;

[0012] S3. Construct a reasonable turnover empty area model based on the data determined in S1 to S2. The reasonable turnover empty area is the reasonable empty area volume when the mining and filling processes of the open-field subsequent filling mining method are connected.

[0013] S4. Based on the aforementioned reasonable turnover empty zone model, evaluate the balance between mining and filling in metal mines that adopt open-field subsequent filling.

[0014] Preferably, the reasonable turnover empty area model includes:

[0015]

[0016] In the formula: Q represents the reasonable turnover volume of the mining-filling void, in ten thousand m³. 3 M 采 The volume of the goaf in the mining area is m. 3 N 动 The number of mining areas to be utilized includes the sum of those currently being mined, those currently being filled, and those currently being prepared for filling; K2 is the production imbalance coefficient; K3 is the ratio coefficient between the number of mining and filling mining areas in the subsequent backfilling mining method.

[0017] Preferably, the steps for evaluating the balance between mining and backfilling in metal mines employing open-cut backfilling, based on the aforementioned reasonable turnover empty zone model, include:

[0018] Determine whether the actual empty area volume at the end of the period is greater than the reasonable turnover empty area volume of mining-filling. If so, output the backlog of filling, i.e. the difference between the two.

[0019] Determine whether the actual void volume at the end of the period is less than or equal to the reasonable turnover void volume of mining-filling. If so, output the mining-filling relationship balance analysis results.

[0020] As can be seen from the above technical solution, compared with the prior art, the beneficial effects of the present invention include:

[0021] This invention introduces for the first time the concept of "reasonable turnover vault" in segmented or staged open-pit subsequent backfilling mining methods. Establishing a reasonable turnover vault model facilitates further analysis of the mining-backfilling balance, enabling accurate application and evaluation during project design, safety assessment, safety status evaluation, and monitoring by relevant departments. The reasonable turnover vault model offers flexible calculations, allowing for rapid analysis of mining and backfilling using only basic data. It provides enterprises using this type of mining method with strict adherence criteria, enabling them to assess the rationality of mining and backfilling operations in a timely manner. This invention has high practicality. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0023] Figure 1 A flowchart illustrating the evaluation method for a reasonable turnover void area in a metal mine based on subsequent backfilling mining, provided in an embodiment of the present invention. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] This invention discloses a method for evaluating the rational turnover of open areas in metal mines based on subsequent backfilling mining. First, the technical terms involved in this embodiment are explained:

[0026] A goaf is a space created by mining.

[0027] The total volume of mined-out areas refers to the total spatial volume formed by mining operations.

[0028] The total number of untreated voids refers to the total number of voids formed by mining operations that have not undergone any treatment measures (including waste rock and tailings backfilling).

[0029] The amount of unfilled voids refers to the unfilled goaf areas of mining enterprises using the filling method, including the sum of reasonably turnover voids and voids with outstanding filling debts.

[0030] Reasonable turnover void space refers to the reasonable void space size that mining enterprises must ensure when using the turnaround and backfilling mining method to connect mining and backfilling processes.

[0031] See Figure 1 This is achieved through the following technical steps:

[0032] S1. Determine the volume of the goaf and the number of mining areas to be used;

[0033] S2. Determine the production imbalance coefficient and the ratio coefficient between the number of mining and backfilling mining areas;

[0034] S3. Construct a reasonable turnover empty area model based on the data determined in S1 to S2. The reasonable turnover empty area is the reasonable empty area volume when the mining and filling processes of the open-field subsequent filling mining method are connected.

[0035] S4. Based on the reasonable turnover void model, evaluate the balance between mining and filling in metal mines that adopt void filling.

[0036] In one embodiment, a reasonable turnover empty space model includes:

[0037]

[0038] In the formula: Q is the designed or approved reasonable turnover void volume for mining-filling, in ten thousand m³. 3 M 采 For the designed or approved volume of the stope void, m 3 N 动 The number of mining areas utilized includes the sum of those currently being mined, those currently being filled, and those currently being prepared for filling; K2 is the enterprise production imbalance coefficient, K2 = 1.05~1.15, the larger the enterprise size, the larger the value; K3 is the ratio coefficient between the number of mining areas utilized and the number of filling mining areas in the subsequent filling mining method. When mining and filling are done simultaneously, K3 = 2, that is, when the number of mining areas and filling mining areas are the same, K3 = 2.

[0039] In one embodiment, the steps for evaluating the balance between mining and backfilling in a metal mine employing a reasonable turnover void model include:

[0040] Determine whether the actual empty area volume at the end of the period is greater than the reasonable turnover empty area volume of mining-filling. If so, output the backlog of filling, i.e. the difference between the two.

[0041] Determine whether the actual void volume at the end of the period is less than or equal to the reasonable turnover void volume of mining-filling. If so, output the mining-filling relationship balance analysis results.

[0042] In one embodiment, the annual number of goaf areas is calculated as follows:

[0043]

[0044] In the formula: V1 represents the amount of void space formed by the company's mining operations in a year, in meters. 3 A represents the company's approved production scale, in 10,000 tons / year; γ represents the weight of the ore per unit volume, in tons / cubic meter. If the company belongs to multiple types, a weighted average calculation should be performed.

[0045] In one embodiment, the annual filling volume calculation

[0046] V2 = V1 × K1

[0047] In the formula: V2 is the total amount of filling required by the enterprise in a year, in ten thousand m³. 3 ;

[0048] K1 is the comprehensive coefficient for settlement and sand runoff of the backfill. K1 = 1.03 to 1.05, with a smaller value for the layered backfill area and a larger value for the subsequent backfill area. As one example, K1 = 1.03 for the layered backfill area and K1 = 1.05 for the subsequent backfill area.

[0049] The following are specific practical applications and verification examples of the method of the present invention:

[0050] Project content:

[0051] The project aims to analyze and study the intrinsic relationship between mining and backfilling in enterprises, verify the number of goaf areas and outstanding issues, determine whether enterprises have achieved a balance between mining and backfilling, and propose a reasonable number of goaf areas for enterprises to rotate between mining and backfilling, providing a reliable basis for the daily management of enterprises and the supervision of relevant departments.

[0052] Enterprise production data:

[0053] The company's approved production capacity is 7 million tons / year, of which 5 million tons / year is in the North Mining Area and 2 million tons / year is in the South Mining Area. The development system is a combination of main and auxiliary vertical shafts and auxiliary inclined ramps, with a diagonal ventilation system on both wings. The mining method is staged ore cutting followed by backfilling mining.

[0054] Verification and calculation of reasonable turnover empty areas:

[0055] The mine has an approved annual production capacity of 7 million tons and an annual formation of 2.0897 million m³ of goaf. 3 .

[0056] The comprehensive coefficient of backfill settlement, backfill material loss and leakage is 1.05; the annual backfill volume is 2.19 million m³. 3 Actual mining production capacity: 2000 tons / day in the North Zone and 1500 tons / day in the South Zone.

[0057] Number of mining sites used for normal production:

[0058] There are 18 in the North Area, including 8 in mining, 8 in filling, and 2 in filling preparation;

[0059] There are 12 in the South Area, including 5 in mining, 5 in filling, and 2 in filling preparation;

[0060] The verified volume of the ongoing mining area is: North Zone 82582 m³ 3 South District 75400m 3

[0061] The enterprise's production equilibrium coefficient is 10%.

[0062] Calculations show that the reasonable turnover area for mining and backfilling at xx iron ore mine is 1.35 million m³. 3 Of which, the northern area has 860,000 m² 3 South District 490,000 m 3 .

[0063] Comprehensive assessment of the enterprise's overall situation:

[0064] By applying the standard for calculating reasonable turnover space and analyzing the actual situation of the enterprise, the following results were obtained:

[0065]

[0066]

[0067] Based on data from mining area engineering geology, mining design, and scientific research results, this study systematically analyzed and demonstrated the stability of ore and rock and goaf areas during the subsequent backfilling mining of staged open areas in the xx iron mine, the reasonable turnover of goaf areas during mining-backfilling, and the monitoring of surface structures and underground stress and rock movement. The research methods were correct, the technical route was advanced, the demonstration process was rigorous, the data was detailed, and the conclusions were reliable, providing a design basis for mines adopting the staged open area backfilling mining method.

[0068] The above provides a detailed description of the evaluation method for reasonable turnover voids in metal mines based on subsequent backfilling mining. Specific examples are used in this embodiment to illustrate the principle and implementation of the invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the invention. Therefore, the content of this specification should not be construed as a limitation of the invention.

[0069] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined in these embodiments may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for evaluating a reasonable turnover empty area of a metal mine based on a surface subsequent filling mining, characterized in that, A metal mine using the empty field subsequent filling method, which is divided into stages or phases, and subsequent filling, comprising the following steps: S1, determining the volume of the empty area and the number of stope; S2, determining the production imbalance coefficient and the ratio coefficient of the number of mining and filling stope; S3, constructing a reasonable turnover empty area model according to the data determined in S1-S2, the reasonable turnover empty area being the reasonable empty area volume when the mining and filling process of the mining method using the empty field subsequent filling method is connected; the reasonable turnover empty area model comprising: In the formula, Q is the reasonable turnover amount of mined and filled goaf, 104 m 3 ; M 采 is the volume of the mined goaf, m 3 ; N 动 is the number of mined goafs, including the sum of the number of goafs being mined, being filled and being prepared for filling, pieces; K2 is the production imbalance coefficient; K3 is the ratio coefficient of the number of mined goafs and the number of filled goafs in the subsequent filling mining method of empty goaf. S4, based on the reasonable turnover empty area model, evaluating the balance relationship between mining and filling of the metal mine using the empty field subsequent filling method.

2. The method for evaluating a reasonable turnover void of a metal mine based on the empty field subsequent filling mining according to claim 1, characterized in that, The step of evaluating the balance relationship between mining and filling of the metal mine using the empty field subsequent filling method based on the reasonable turnover empty area model comprises: determining whether the actual empty area volume at the end of the period is greater than the mining-filling reasonable turnover empty area volume, if yes, outputting the filling shortage amount, i.e. the difference between the two; determining whether the actual empty area volume at the end of the period is less than or equal to the mining-filling reasonable turnover empty area volume, if yes, outputting the mining-filling relationship balance analysis result.

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