Mining method and system based on improved mathews block stability analysis

Abstract

The application relates to the technical field of mining, and provides a mining method and system based on improved mathews stope stability analysis. In the method, in response to the fact that the target stope exists in advance support, the stress coefficient of the target stope is corrected and the influence coefficient of the pillar on the stability of the target stope is introduced when the stability coefficient of the target stope is determined; then, the stability of the target stope is analyzed through the position of the control span of the target stope and the stability coefficient of the target stope in the improved Mathews stability graph of the stope stability analysis which is constructed in advance. Through the correction of the stress coefficient of the stope and the introduction of the influence of the pillar on the stability of the stope, the advance support of the stope and the role of the pillar in the stability are fully combined, so that the target stope stability can be more scientifically and accurately analyzed, and the analysis precision of the target stope stability is improved.

Description

Technical Field

[0001] This application relates to the field of mining technology, and in particular to a mining method and system based on improved Mathews map-based mining stability analysis. Background Technology

[0002] In underground mining activities, the stope is a crucial location affecting mine productivity, safety, and profitability. Due to limited space, a large number of workers, large equipment, complex production processes, and significant challenges in coordinating personnel, equipment, and processes, the stope is consistently a frequent site of underground mine safety accidents. Ensuring stope stability is essential for guaranteeing safe production operations and ensuring continuous and stable mine production. Therefore, accurately analyzing and evaluating stope stability and determining appropriate countermeasures is of great significance for maintaining mine production, sustaining capacity, and ultimately achieving high-quality and sustainable development for mining enterprises. Summary of the Invention

[0003] The purpose of this application is to provide a mining method and system based on improved Mathews map-based mining stability analysis, in order to solve or alleviate the problems existing in the prior art.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] This application provides a mining method based on improved Mathews chart-based stope stability analysis, comprising: in response to the existence of advanced support in the target stope, determining the stability coefficient of the target stope. At that time, the stress coefficient of the target stope is corrected and the influence coefficient of the pillar on the stability of the target stope is introduced. ; through the control span of the target mining area Stability coefficient of the target mining area An improved Mathews stability diagram is constructed for stope stability analysis to perform stability analysis on the target stope.

[0006] Preferably, in response to the existence of advanced support in the target mining area, according to the formula:

[0007]

[0008] The stress coefficient of the target mining area is corrected to obtain the corrected stress coefficient. In the formula, The maximum induced stress in the target mining area rock. For the anchoring force of the advanced support of the target mining area, The uniaxial compressive strength of the rock in the target mining area.

[0009] Preferably, according to the formula:

[0010]

[0011] Determine the influence coefficient of the pillar on the stability of the target stope. And when there are no pillars in the target mining area When the target mining area is filled with pillars, In the formula, The target mining area is the planar area. The total area supported by the pillars in the target mining area.

[0012] Preferably, according to the formula:

[0013]

[0014] Determine the stability coefficient of the target mining area In the formula, The corrected NGI tunnel quality index for the target mining area. The corrected stress coefficient for the target mining area. The joint orientation coefficient of the target mining area. The gravity adjustment coefficient for the target mining area. This is the influence coefficient of the pillar on the stability of the target stope.

[0015] Preferably, according to the formula:

[0016]

[0017] Determine the control span of the target mining area In the formula, The controlling planar area in the pressure direction of the target mining area. The perimeter of the control plane in the direction of pressure in the target mining area.

[0018] Preferably, the control span of the target mining area is used respectively. Logarithm to base 10 Stability coefficient of the target mining area Logarithm to base 10 An improved Mathews stability diagram for stope stability analysis was constructed.

[0019] This embodiment also provides a mining system based on improved Mathews chart stope stability analysis. The system employs any of the aforementioned mining methods based on improved Mathews chart stope stability analysis to perform stability analysis on the target stope. The system includes:

[0020] The stability coefficient correction unit is configured to respond to the presence of advanced support in the target stope, and then determine the stability coefficient of the target stope. At that time, the stress coefficient of the target stope is corrected and the influence coefficient of the pillar on the stability of the target stope is introduced. ;

[0021] The stability analysis unit is configured to pass through the control span of the target mining area. and target mining stability coefficient An improved Mathews stability diagram is constructed for stope stability analysis to perform stability analysis on the target stope.

[0022] Beneficial effects:

[0023] The mining method and system based on improved Mathews chart stope stability analysis provided in this application embodiment, in response to the existence of advanced support in the target stope, determines the stability coefficient of the target stope. At that time, the stress coefficient of the target stope is corrected and the influence coefficient of the pillar on the stability of the target stope is introduced. Then, the control span of the target mining area is determined. and target mining stability coefficient An improved Mathews stability diagram is constructed for stope stability analysis, and the stability of the target stope is analyzed.

[0024] Therefore, by correcting the stress coefficient of the stope and introducing the influence of the pillar on the stope stability, and by fully combining the role of the stope's advance support and the pillar on stability, an improved Mathews stability diagram is constructed to more accurately reflect the spatial span of the stope's stability control. This diagram is then matched with the target stope space, enabling a more scientific and accurate analysis of the target stope's stability and improving the accuracy of the target stope stability analysis. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. Wherein:

[0026] Figure 1 In existing technologies, stability coefficient is used as the primary factor. and hydraulic radius The traditional Mathews stability graph is based on this.

[0027] Figure 2 In existing technologies, stability coefficient is used as the primary factor. and hydraulic radius Mathews-based stability graph;

[0028] Figure 3 This is a flowchart illustrating a stoping stability analysis method based on an improved Mathews stability diagram, according to some embodiments of this application.

[0029] Figure 4 For the stability coefficient provided according to some embodiments of this application and control span An improved Mathews stability plot based on the base-10 logarithm;

[0030] Figure 5 This is a schematic diagram illustrating the intensity of displacement along the length of the roof of a target mining area according to some embodiments of this application;

[0031] Figure 6 This is a schematic diagram illustrating the intensity of displacement change in the width direction of the roof of a target mining area according to some embodiments of this application;

[0032] Figure 7 This is a schematic diagram of the structure of a mining stability analysis system based on an improved Mathews stability diagram, according to some embodiments of this application. Detailed Implementation

[0033] The present application will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation and not by way of limitation. In fact, those skilled in the art will understand that modifications and variations can be made to the present application without departing from the scope or spirit of the present application. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention should fall within the scope of protection of the embodiments of the present invention.

[0034] With the development of stope stability analysis, many iterations of stope stability analysis have emerged. For example, based on a clear understanding of the distribution characteristics and volume of goaf, FLAC3D software is used to analyze the stability of goaf in old mining areas, obtaining the stress distribution, displacement field, and plastic zone changes in the stope, providing reference and support for ensuring stope stability. However, current goaf stability analysis mostly uses finite element and infinite element tools such as FLAC, ANSYS, and MIDAS, employing numerical simulation as the analysis method to conduct stability analysis of underground mine goaf. This type of analysis requires extensive knowledge of rock mechanics and relies on specialized software, placing high demands on the hardware and personnel skills of mining enterprises. Moreover, numerical simulation analysis generally sets relatively ideal boundary conditions for system analysis and assumes homogeneity and isotropy of materials and parameters, leading to significant differences between numerical simulation analysis results and actual conditions, making it difficult to directly guide engineering practice. Therefore, methods using mathematical theory for stope stability analysis have been developed.

[0035] While using mathematical theory to analyze stope stability is relatively abstract and cannot intuitively simulate and reveal the entire spatiotemporal evolution of stress and strain in the stope, it has few limitations in application conditions and can still analyze the stability results of underground mine stopes. It is convenient to apply, and the results are intuitive, thus it has been applied in practice. Among these methods, the Mathews stability diagram method, based on rock mechanics for underground confined space stability analysis, has several advantages, including a rigorous analysis process, comprehensive consideration of factors, objective mathematical quantitative analysis, and intuitive graphical analysis results. By combining this method with the objective realities of underground stopes, targeted improvements can be made to the Mathews stabilization method for the stope application environment, enabling a more scientific and targeted analysis of underground mine stope stability. This provides a reference for evaluating and determining the stability of underground mine stopes and guides safe production in underground mines.

[0036] In this embodiment, a stability coefficient is defined. and hydraulic radius The traditional Mathews stable graph based on this is the initial stable graph, such as... Figure 1 As shown, the traditional Mathews stability diagram (initial stability diagram) is composed of the stability hydraulic radius curve. And the hydraulic radius curve of the collapse The graph is divided into a stable region, a transition region, and a collapse region.

[0037] With the continued application of the Mathews stability diagram method, improvements have been made to the traditional Mathews stability diagram (initial stability diagram), defining it based on the original hydraulic radius (…). Logarithm to base 10 As a new hydraulic radius ( ), with the original stability coefficient logarithm with base As a new stability coefficient ( The Mathews stability graph constructed based on ) is an intermediate stability graph, such as Figure 2 As shown, the intermediate stability diagram is divided into a stable region, a failure region, and a collapse region by the stability-failure line and the collapse line, respectively.

[0038] However, both the traditional Mathews stability diagram (initial stability diagram) and the intermediate stability diagram, when applied to stope stability analysis, have the following drawbacks: (1) they do not consider the stope support effect; (2) they do not reflect the role of pillars within the stope; and (3) the meaning of the hydraulic radius is unclear and does not match the actual stope space. Therefore, both the traditional Mathews stability diagram (initial stability diagram) and the intermediate stability diagram have obvious defects in analyzing stope stability.

[0039] Based on this, this embodiment provides a mining method based on improved Mathews diagram for stope stability analysis. The stress coefficient of the stope is corrected by combining the advanced support of the stope, and the influence coefficient of the pillar on the stability of the stope is introduced to reflect the importance of the pillar in maintaining the stability of the stope. At the same time, the control span of the collapse is matched with the control space span of the stope stability to construct an improved Mathews stability diagram, so as to achieve a more accurate analysis of the stope stability.

[0040] like Figures 3 to 6 As shown, the mining method based on improved Mathews chart stope stability analysis in this embodiment includes:

[0041] Step S101: In response to the existence of advanced support in the target stope, the stability coefficient of the target stope is determined. At that time, the stress coefficient of the target stope is corrected and the influence coefficient of the pillar on the stability of the target stope is introduced. .

[0042] During mining operations, when the roof is unstable, anchor bolts or cables are used for pre-support to ensure the stability of the stope roof. However, when analyzing stope stability using traditional Mathews stability diagrams (initial stability diagrams) or intermediate stability diagrams, only the impact of primary ore or exposed space created by subsequent mining on stope stability is considered, lacking analysis of the role of artificial support measures such as anchor bolts and cables in stope stability.

[0043] In response, when the target stope support resists the pressure of the upper stress on the target stope roof through the anchoring force of the anchor bolts or cables used in the support, thereby improving the stability of the target stope roof, i.e., when the target stope has advance support, the anchoring force generated by the anchor bolts or cables... It offset part of the maximum induced stress in the target mining area rock. In this embodiment, according to the formula:

[0044]

[0045] The stress coefficient of the target mining area is corrected to obtain the corrected stress coefficient. In the formula, The maximum induced stress in the target mining area rock. For the anchoring force of the advanced support of the target mining area, The uniaxial compressive strength of the rock in the target mining area. At that time, Assigning the value to an infinite decimal ,but .

[0046] Within the stope space, pillars (generally regular or irregular points) may remain. These pillars are crucial for maintaining stope stability. However, when analyzing stope stability using traditional Mathews stability diagrams (initial stability diagrams) or intermediate stability diagrams, the impact of pillars on stope stability is not considered. Pillars within the stope have a significant impact on stope stability. When there are no pillars in the stope, the stope is prone to collapse; when the stope is filled with pillars, there is no exposed space, and the stope can be considered absolutely safe. Therefore, the impact of pillars on stope stability is comprehensive and decisive.

[0047] In this embodiment, an influence coefficient is introduced. Characterizes the effect of the pillar on the stability of the target stope. Specifically, according to the formula:

[0048]

[0049] Determine the influence coefficient of the pillar on the stability of the target stope. And when there are no pillars in the target mining area When the target mining area is filled with pillars, In the formula, The target mining area is the planar area. This represents the total area supported by the pillar.

[0050] In stope stability analysis, the stability coefficient reflects the overall quality of the surrounding ore and rock, stress state, and the impact of sliding along weak surfaces on stope stability. In this embodiment, the stope stability coefficient... It is related to the corrected NGI tunnel quality index of the stope, the corrected stress coefficient of the stope, the joint orientation coefficient of the stope, the gravity adjustment coefficient of the stope, and the influence coefficient of the pillar on the stability of the stope. Specifically, according to the formula:

[0051]

[0052] Determine the stability coefficient of the target mining area In the formula, The corrected NGI tunnel quality index for the target mining area. The corrected stress coefficient for the target mining area. The joint orientation coefficient of the target mining area. The gravity adjustment coefficient for the target mining area. This is the influence coefficient of the pillar on the stability of the target stope.

[0053] Wherein, according to the formula:

[0054]

[0055] Determine the modified NGI tunnel quality index for the target mining area In the formula, The rock quality index for the target mining area is the ratio of the sum of the lengths of complete core segments longer than 10cm in the target mining area to the total length of the borehole core. This is the joint group number coefficient of the target stope, and its value is determined by the statistically obtained joint group number of the target stope. The joint roughness coefficient of the target mining area is determined by the shape of the joint surface and whether the filling material between the joint surfaces prevents the joint surfaces from contacting each other. The joint alteration coefficient of the target mining area is determined by the contact condition between joints and the filling material between joints.

[0056] According to the formula:

[0057]

[0058] Determine the joint orientation coefficient of the target mining area In the formula, The dip angle of the target mining area's main plane is the difference between the dip angle of the main joint group or the controlling joint group.

[0059] According to the formula:

[0060]

[0061] Determine the gravity adjustment coefficient of the target mining area In the formula, The surface dip angle of the target mining area.

[0062] Therefore, by correcting the stress coefficient of the target stope and introducing the influence of the pillar on the stability of the target stope, and by fully combining the advanced support of the target stope and the role of the pillar on stability, a more scientific and accurate analysis of the stability of the target stope can be carried out, thereby improving the accuracy of the analysis of the stability of the target stope.

[0063] Step S102: Controlling the span of the target mining area Stability coefficient of the target mining area An improved Mathews stability diagram is constructed for stope stability analysis to perform stability analysis on the target stope.

[0064] When analyzing stope stability using either the traditional Mathews stability diagram (initial stability diagram) or the intermediate stability diagram, the impact of exposed space on stope stability is primarily characterized by the hydraulic radius. However, under stope pressure, two complete spatial planes exist in the pressure direction: one formed by the stope length and height, and the other by the stope width and height. The characteristic parameter of stope exposed space stability is the span of the stope stability-controlling space, but the hydraulic radius does not represent the span of the stope's controlling space. Therefore, using the hydraulic radius to characterize the impact of exposed space on stope stability is incompatible with the stope space itself.

[0065] In this embodiment, the control span of the target mining area is used as the basis for this approach. Replacing the hydraulic radius as the shape factor for the temperature-related influence of the target stope, this method more scientifically reflects the impact of the target stope's spatial shape on stability. Specifically, under pressure conditions, the maximum displacement of the target stope's roof generally occurs in the middle of the stope, and the intensity of displacement change along the width of the roof is stronger than that along its length. Therefore, the width of the target stope... and target mining area height The pressure-bearing space plane formed serves as the controlling plane for the stability of the target mining area, according to the formula:

[0066]

[0067] Determine the control span of the target mining area In the formula, The controlling planar area in the pressure direction of the target mining area. The perimeter of the control plane in the direction of pressure in the target mining area.

[0068] Finally, based on the target mining area control span Logarithm to base 10 Stability coefficient of the target mining area Logarithm to base 10 An improved Mathews stability graph is constructed to perform stability analysis on the target mining area. In a specific example,

[0069]

[0070] In other words, the improved Mathews stability diagram of the target mining area is based on the intermediate stability diagram, with the horizontal axis of the intermediate stability diagram shifted to the left. While keeping the vertical axis unchanged, an improved Mathews stability diagram for the target mining area stability analysis can be obtained.

[0071] Therefore, addressing the shortcomings of traditional Mathews stability diagrams (initial stability diagrams) or intermediate stability diagrams in analyzing stope stability—namely, the lack of consideration for underground space roof control support, the impact of pillars on stope stability, and the unclear meaning of shape parameters that do not fully reflect the reality of the stope space—a more comprehensive and scientific stability coefficient is obtained by correcting the stress coefficient of the stope. Furthermore, the meaning of shape parameters is clarified by replacing the hydraulic radius with the control span of the stope, and a scientific and objective reflection of the stope space is provided. This enables a more scientific and accurate analysis of the target stope's stability, improving the accuracy of the target stope stability analysis.

[0072] like Figure 7 As shown, this embodiment also provides a mining system based on improved Mathews chart stope stability analysis. The system employs the mining method based on improved Mathews chart stope stability analysis from any of the above embodiments to perform stability analysis on the target stope. The analysis system includes:

[0073] The stability coefficient correction unit 701 is configured to, in response to the presence of advanced support in the target stope, determine the stability coefficient of the target stope. At that time, the stress coefficient of the target stope is corrected and the influence coefficient of the pillar on the stability of the target stope is introduced. ;

[0074] Stability analysis unit 702 is configured to pass through the control span of the target mining area. and target mining stability coefficient An improved Mathews stability diagram for stope stability analysis was constructed to perform stability analysis on the target stope.

[0075] The mining system based on improved Mathews map-based stope stability analysis provided in this embodiment can implement the steps and processes of the mining method based on improved Mathews map-based stope stability analysis in any of the above embodiments, and achieve the same technical effect, which will not be described in detail here.

[0076] In the description of this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0077] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A mining method based on improved Mathews chart-based stope stability analysis, characterized in that, include: In response to the existence of advanced support in the target stope, the stability coefficient of the target stope is determined. At that time, the stress coefficient of the target stope is corrected and the influence coefficient of the pillar on the stability of the target stope is introduced. ; where, according to the formula: The stress coefficient of the target mining area is corrected to obtain the corrected stress coefficient. In the formula, The maximum induced stress in the target mining area rock. For the anchoring force of the advanced support of the target mining area, The uniaxial compressive strength of the rock in the target mining area; And according to the formula: Determine the influence coefficient of the pillar on the stability of the target stope. And when there are no pillars in the target mining area When the target mining area is filled with pillars, In the formula, The target mining area is the planar area. The total area supported by pillars in the target stope; Controlling the span of the target mining area Stability coefficient of the target mining area An improved Mathews stability diagram for stope stability analysis is constructed to perform stability analysis on the target stope; wherein, according to the formula: Determine the control span of the target mining area In the formula, The controlling planar area in the pressure direction of the target mining area. The perimeter of the control plane in the direction of pressure in the target mining area.

2. The method according to claim 1, characterized in that, According to the formula: Determine the stability coefficient of the target mining area In the formula, The corrected NGI tunnel quality index for the target mining area. The corrected stress coefficient for the target mining area. The joint orientation coefficient of the target mining area. The gravity adjustment coefficient for the target mining area. This is the influence coefficient of the pillar on the stability of the target stope.

3. The method according to claim 1, characterized in that, Based on the target mining area control span Logarithm to base 10 and the stability coefficient of the sample collection site Logarithm to base 10 An improved Mathews stability diagram for stope stability analysis was constructed.

4. A mining system based on improved Mathews chart-based stope stability analysis, characterized in that, The stability analysis of the target stope is performed using the mining method based on the improved Mathews chart stope stability analysis as described in any one of claims 1-3. The system includes: The stability coefficient correction unit is configured to respond to the presence of advanced support in the target stope, and then determine the stability coefficient of the target stope. At that time, the stress coefficient of the target stope is corrected and the influence coefficient of the pillar on the stability of the target stope is introduced. ; The stability analysis unit is configured to pass through the control span of the target mining area. and target mining stability coefficient An improved Mathews stability diagram is constructed for stope stability analysis to perform stability analysis on the target stope.

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