Close-range coal seam roof classification method

Abstract

The invention relates to the field of coal mining, and provides a close-range coal seam roof classification method. The close-range coal seam roof classification method comprises the following steps: acquiring lithologic composition of a rock stratum between close-range upper and lower coal layers; if the interlayer rock stratum is only composed of one lithology, the roof is a single roof, and if the interlayer rock stratum is composed of two lithology rock stratums, the roof is a combined roof; and if the interlayer rock stratum is formed by compounding at least three lithologic rock stratums, the interlayer rock stratum is a composite roof. The short-distance coal seam roof classification method enables the evaluation of the roof stability to be more specific and accurate, and is beneficial to formulating a more scientific and reasonable support scheme and safety measures in a coal mining process; the method is helpful for identifying the potential instability risk of the roof, taking preventive measures in advance, reducing accidents such as roof caving and collapse, and ensuring the life safety of miners.

Description

Technical Field

[0001] The invention relates to the field of coal mining and provides a method for classifying coal seam roofs at a close distance. Background Art

[0002] At present, the classification methods of coal seam roof types in my country are mainly proposed for the mining of gently inclined single coal seams. These methods are not effective for close-range coal seam mining and cannot accurately reflect the complex characteristics of close-range coal seam roofs.

[0003] Among the related technologies, there are many technical difficulties in close-range coal seam mining: Small distance between layers: After the mining of close-range coal seams, the mining of the upper coal seams affects the degree of damage to the roof of the lower coal seams, making the traditional roof classification method ineffective.

[0004] Complex roof types: The type of the roof of the coal seam below is complexly affected by the lithology type and combination of the underlying coal seam, and is difficult to be summarized into the existing classification system.

[0005] Stability of tunnel surrounding rock: During the mining process of close-range coal seams, the stability of the tunnel surrounding rock is much lower than that of single coal seam mining, and a more accurate roof classification method is needed for support selection and surrounding rock control.

[0006] Technical pain points: Lack of specificity: The existing roof classification method cannot meet the needs of close-range coal seam mining, resulting in difficulty in roof management, insufficient machine selection, and poor surrounding rock stability control.

[0007] Poor operability: Classifying the close-up coal seam roof into the existing classification system has complicated operation procedures, vague classification standards, and lacks practicality.

[0008] High risk: The lack of a sophisticated roof classification method has increased the safety risks in coal mine production and threatened the lives and property of workers. Summary of the invention

[0009] The embodiment of the present invention provides a method for classifying the roof of a close-range coal seam, which can more accurately reflect the complex characteristics of the roof of a close-range coal seam, provide a more scientific basis for the selection of mining field supports, air load analysis, and tunnel surrounding rock stability control, and effectively reduce the safety risks of coal mine production.

[0010] The embodiment of the present invention also provides a close-range coal seam roof classification device.

[0011] The first aspect of the present invention provides a method for classifying a coal seam roof at a close distance, comprising: Obtain the lithology composition of the interlayers of coal seams in close proximity; If the interlayer rock strata are composed of only one type of rock, it is a single roof; if the interlayer rock strata are composed of two types of rock strata, it is a combined roof; if the interlayer rock strata are composed of at least three types of rock strata, it is a composite roof.

[0012] According to one embodiment of the present invention, it also includes: The step of evaluating the interlayer spacing is used to assist in determining the classification of the top plate. If the interlayer spacing is less than the first interlayer preset spacing, it is a single top plate. If the interlayer spacing is greater than the first interlayer preset spacing and less than the second interlayer preset spacing, it is a combined top plate. If the interlayer spacing is greater than the second interlayer preset spacing, it is a composite top plate, wherein the first interlayer preset spacing is less than the second interlayer preset spacing, and the second interlayer preset spacing is less than the third interlayer preset spacing.

[0013] According to one embodiment of the present invention, the step of obtaining the lithology composition of the interlayer rock layers between the upper and lower coal seams in close proximity includes: The analysis is performed based on the coal mine drilling column chart data, and the lithology composition is determined by identifying the rock formation information in the column chart.

[0014] According to one embodiment of the present invention, it also includes: The roof stability assessment step determines the support of the lower coal seam mining tunnel and the surrounding rock control of the lower coal seam mining area based on the roof classification results.

[0015] According to one embodiment of the present invention, the roof stability assessment step includes: Calculate at least one of the strength, thickness, bedding surface condition and combination of interlayer rock layers of the roof to comprehensively determine the bearing capacity and potential failure mode of the roof.

[0016] According to one embodiment of the present invention, it also includes: Generate a roof classification report.

[0017] According to one embodiment of the present invention, the roof classification report may be electronically transmitted to a coal mine management system to guide mining operations in real time.

[0018] According to one embodiment of the present invention, it also includes: The coal mine borehole histogram is updated regularly, and the roof classification is re-performed based on the updated coal mine borehole histogram.

[0019] According to one embodiment of the present invention, the close-range coal seam roof classification method can at least be applied to close-range coal seam mining under different geological conditions.

[0020] A second aspect of the present invention provides a close-range coal seam roof classification device, comprising: An acquisition module is used to obtain the lithology composition of the interlayers of the upper and lower coal seams in close proximity; A determination module is used to determine that if the interlayer rock strata are composed of only one lithology, it is a single roof; if the interlayer rock strata are composed of two lithology strata, it is a combined roof; if the interlayer rock strata are composed of at least three lithology strata, it is a composite roof.

[0021] According to the method for classifying the roof of a coal seam at a close distance provided by the embodiment of the first aspect of the present invention, the accurate classification of the types of the roof of the coal seam is achieved by finely distinguishing the lithological composition of the rock strata between the coal seams. The traditional roof classification method may be relatively general and difficult to accurately reflect the complexity and diversity of the roof rock strata. The present invention distinguishes between a single roof, a combined roof and a composite roof, so that the evaluation of the stability of the roof is more specific and accurate, which helps to formulate more scientific and reasonable support plans and safety measures during coal mining. Understanding the detailed classification information of the coal seam roof can help mine engineers better plan the mining sequence, select mining methods and equipment, and determine a reasonable mining schedule. This is of great significance for improving mining efficiency, reducing mining costs, and ensuring production safety. Different types of roofs have differences in mechanical properties, deformation characteristics, etc., and the corresponding support requirements and risk control measures are also different. The classification method provided by the present invention helps to identify the potential instability risk of the roof, take preventive measures in advance, reduce the occurrence of accidents such as roof fall and collapse, and ensure the life safety of miners. By accurately classifying the coal seam roof, the useful mineral resources in the roof rock strata can be more reasonably utilized to reduce resource waste. At the same time, different resource recovery strategies and environmental protection measures can be adopted for different types of roofs to achieve a win-win situation of economic and environmental benefits. In the daily management and decision-making process of coal mining enterprises, roof classification information is an important reference. The classification method provided by the present invention can provide enterprises with accurate and reliable roof classification data, and provide strong support for formulating development strategies, adjusting production plans, optimizing resource allocation, etc.

[0022] According to the second aspect of the present invention, an embodiment provides a close-range coal seam roof classification device. Through automated data acquisition and processing procedures, and intelligent classification algorithms, the classification device provided by the present invention can significantly improve the efficiency and accuracy of roof classification, and reduce the cost and time of manual intervention. Based on detailed geological data and scientific classification logic, the device can more accurately reflect the actual situation of the coal seam roof, and provide a reliable basis for subsequent mining design, support plan formulation, etc. The classification results can be directly applied to production management, safety risk prevention and control, and resource utilization of coal mining enterprises, providing strong support for enterprise decision-making and promoting the intelligent and efficient development of the coal mining industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are 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.

[0024] Figure 1 It is a schematic flow chart of the close-range coal seam roof classification method provided by the present invention. DETAILED DESCRIPTION

[0025] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0026] like Figure 1 As shown, the first aspect of the present invention provides a method for classifying a coal seam roof at a close distance, comprising: Step 10, obtaining the lithology composition of the interlayer rock layers between the upper and lower coal seams in close proximity; Step 20, if the interlayer rock strata are composed of only one type of rock, it is a single roof; if the interlayer rock strata are composed of two types of rock strata, it is a combined roof; if the interlayer rock strata are composed of at least three types of rock strata, it is a composite roof.

[0027] According to the method for classifying the roof of a coal seam at a close distance provided by the embodiment of the first aspect of the present invention, the accurate classification of the types of the roof of the coal seam is achieved by finely distinguishing the lithological composition of the rock strata between the coal seams. The traditional roof classification method may be relatively general and difficult to accurately reflect the complexity and diversity of the roof rock strata. The present invention distinguishes between a single roof, a combined roof and a composite roof, so that the evaluation of the stability of the roof is more specific and accurate, which helps to formulate more scientific and reasonable support plans and safety measures during coal mining. Understanding the detailed classification information of the coal seam roof can help mine engineers better plan the mining sequence, select mining methods and equipment, and determine a reasonable mining schedule. This is of great significance for improving mining efficiency, reducing mining costs, and ensuring production safety. Different types of roofs have differences in mechanical properties, deformation characteristics, etc., and the corresponding support requirements and risk control measures are also different. The classification method provided by the present invention helps to identify the potential instability risk of the roof, take preventive measures in advance, reduce the occurrence of accidents such as roof fall and collapse, and ensure the life safety of miners. By accurately classifying the coal seam roof, the useful mineral resources in the roof rock strata can be more reasonably utilized to reduce resource waste. At the same time, different resource recovery strategies and environmental protection measures can be adopted for different types of roofs to achieve a win-win situation of economic and environmental benefits. In the daily management and decision-making process of coal mining enterprises, roof classification information is an important reference. The classification method provided by the present invention can provide enterprises with accurate and reliable roof classification data, and provide strong support for formulating development strategies, adjusting production plans, optimizing resource allocation, etc.

[0028] Please continue to see Figure 1 , the first embodiment of the present invention proposes a classification method for the roof of a close-up coal seam, which aims to achieve effective distinction of roof types by accurately analyzing the lithology composition of the rock strata between coal seams. Specifically, in step 10, the lithology composition of the rock strata between the close-up and close-down coal seams is obtained; This step is the basis of classification, and it is necessary to obtain and sort out detailed lithological composition information of the interlayers of the upper and lower coal seams in close proximity through geological exploration, drilling sampling, laboratory analysis, etc. This information includes but is not limited to the type, thickness, distribution of the rock layers, and the contact relationship between the rock layers.

[0029] In step 20, the roof type is determined based on the lithological composition; After obtaining the lithology composition information, the pre-set classification criteria are used for judgment. If the interlayer rock layer is composed of only one lithology, it indicates that its structure is relatively simple and has high stability, so it is judged as a single roof.

[0030] If the interlayer rock layer is composed of two types of rock layers, and there are certain differences in the properties, thickness or distribution of these two rock layers, it is necessary to consider the impact of their interaction on the stability of the roof, so it is judged as a combined roof.

[0031] If the interlayer rock strata are composed of at least three types of rock strata, it means that its structure is complex, the interaction between different rock strata is more complex and changeable, and the impact on the stability of the roof is more significant. Therefore, it is judged to be a composite roof.

[0032] By analyzing the lithology of the inter-coal layer in detail and judging it according to scientific classification standards, the present invention can more accurately determine the roof type of the coal seam below at a close distance, avoiding the subjectivity and uncertainty in traditional classification methods. Accurate roof classification results provide an important basis for support design, mining method selection, safety risk prevention and control in the coal mining process. Different types of roofs require different mining measures and support schemes to ensure the safety and efficiency of the mining process.

[0033] According to one embodiment of the present invention, it also includes: The step of evaluating the interlayer spacing is used to assist in determining the classification of the top plate. If the interlayer spacing is less than the first interlayer preset spacing, it is a single top plate. If the interlayer spacing is greater than the first interlayer preset spacing and less than the second interlayer preset spacing, it is a combined top plate. If the interlayer spacing is greater than the second interlayer preset spacing, it is a composite top plate, wherein the first interlayer preset spacing is less than the second interlayer preset spacing, and the second interlayer preset spacing is less than the third interlayer preset spacing.

[0034] According to an extended embodiment of the present invention, the method for classifying the roof of a close-range coal seam is further refined and optimized, specifically by adding a step for evaluating the interlayer distance to more comprehensively consider the impact of geological conditions on roof classification.

[0035] Specifically, in this step, a quantitative assessment of interlayer spacing is introduced. Interlayer spacing refers to the vertical distance between the upper and lower coal seams, which has an important impact on the stability and classification of the roof.

[0036] Multiple preset spacings are set as the classification basis, including the preset spacing between the first layers, the preset spacing between the second layers (and optional preset spacings of more layers, but only two layers are mentioned in this example to simplify the description). These preset spacings are determined comprehensively based on geological principles, engineering experience and actual conditions of coal mines.

[0037] If the interlayer spacing is smaller than the preset spacing between the first layers, it is considered that the interaction between the rock layers is close and the stability of the roof is less affected by the rock properties, so it is determined to be a single roof.

[0038] If the interlayer spacing is greater than the preset spacing between the first layers but less than the preset spacing between the second layers, it indicates that the rock layers begin to show a certain degree of independence but are not yet completely separated. The stability of the roof is affected by the rock type combination, so it is judged to be a combined roof.

[0039] If the interlayer spacing is greater than the preset spacing between the second layers, the rock layers are almost completely independent, and the stability of the roof is affected by the comprehensive influence of multiple rock types and their combinations, so it is determined to be a composite roof.

[0040] By introducing interlayer spacing as one of the classification bases, roof classification no longer relies solely on lithology, but takes into account both lithology and spatial structure, thereby improving the accuracy and scientificity of classification. The classification results are closer to the actual needs of coal mining, providing a more accurate and comprehensive basis for subsequent mining design, support plan formulation and safety risk prevention and control.

[0041] According to one embodiment of the present invention, the step of obtaining the lithology composition of the interlayer rock layers between the upper and lower coal seams in close proximity includes: The analysis is based on the coal mine drilling column data and the lithology composition is determined by identifying the rock formation information in the column diagram.

[0042] In a specific embodiment of the present invention, in order to accurately obtain the lithological composition of the interlayer rock layers between the upper and lower coal seams in close proximity, an analysis method based on the coal mine drilling columnar data is adopted.

[0043] The method mainly includes the following steps: Data collection: First, collect the borehole columnar data of the coal mining area. These data are usually obtained by processing the core samples drilled during geological exploration, and record in detail the lithology, thickness, structure and other information of the rock layers at different depths in the borehole path.

[0044] Histogram analysis: Next, the collected borehole histograms are analyzed in depth. During the analysis, it is necessary to carefully identify the various rock formation information on the histograms, including the color, texture, particle size, bedding structure and other characteristics of the rock formations. These characteristics are important bases for judging the rock properties.

[0045] Lithology determination: Based on the rock formation information on the column chart, combined with geological knowledge and experience, the lithology of each rock layer is accurately determined. The determination of lithology is usually based on multiple considerations such as the mineral composition, chemical composition, and physical properties of the rock.

[0046] Lithology composition sorting: Finally, sort out the lithology of each rock layer obtained by analysis to form a lithology composition report of the interlayers of the coal seams in close proximity. The report should list in detail the lithology, thickness, distribution range and other information of each rock layer to provide basic data for subsequent roof classification.

[0047] By directly analyzing the coal mine borehole columnar data, the lithologic composition information of the inter-coal layer can be obtained more accurately. This method avoids the data errors and subjective judgments that may exist in the traditional method, and improves the accuracy and reliability of the data. Based on accurate lithologic composition data, the subsequent roof classification work will be more scientific. Lithologic composition is one of the important bases for roof classification, and accurate lithologic data can ensure the accuracy and rationality of the classification results. The efficiency of data processing can be greatly improved through automated or semi-automated columnar analysis methods. Compared with traditional manual analysis methods, this method can complete data collection, analysis and collation faster, providing strong support for the rapid advancement of coal mining. Accurate lithologic composition information helps coal mining companies to have a more comprehensive understanding of the geological conditions of coal seams and their roofs, so as to formulate reasonable mining plans and support measures. This helps to reduce safety risks in the mining process and protect the lives of miners.

[0048] According to one embodiment of the present invention, it also includes: The roof stability assessment step determines the support of the lower coal seam mining tunnel and the surrounding rock control of the lower coal seam mining area based on the roof classification results.

[0049] In one embodiment of the present invention, in addition to the above-mentioned roof classification method, a roof stability assessment step is further introduced. This step is to make scientific and reasonable planning and decision-making on the support design of the lower coal seam mining tunnel and the surrounding rock control of the lower coal seam mining stope based on the roof classification results.

[0050] The specific contents of the roof stability assessment steps are as follows: Data integration: First, the roof classification results are integrated with other geological exploration data, engineering design parameters, etc. to form a comprehensive geological and engineering database. These data include but are not limited to rock lithology, rock thickness, interlayer spacing, coal seam thickness, groundwater conditions, and ground stress distribution.

[0051] Stability analysis: Based on the integrated data, numerical simulation, physical simulation or empirical formula are used to quantitatively analyze the stability of the roof. During the analysis, the influence of various factors on the stability of the roof, such as the roof lithology combination, interlayer structure, and mining disturbance, needs to be considered.

[0052] Support design: According to the results of roof stability analysis and the actual situation of coal mining, a reasonable support scheme is designed. The support scheme should be able to effectively control the deformation and damage of the roof and ensure the stability and safety of the mining tunnel. Support measures may include bolt support, anchor cable support, bracket support, etc.

[0053] Surrounding rock control: formulate corresponding control strategies and measures for the control of surrounding rock in the lower coal seam mining area. These measures are aimed at reducing the stress concentration and damage of the surrounding rock during the mining process and protecting the stability of the surrounding rock in the mining area. Possible surrounding rock control measures include pre-splitting blasting, grouting reinforcement, stress transfer, etc.

[0054] Scheme optimization and adjustment: After the support design and surrounding rock control scheme are initially determined, the scheme is optimized and adjusted. By comprehensively considering factors such as technical feasibility, economy and safety, the scheme is continuously improved and optimized to ensure the rationality and effectiveness of the final scheme.

[0055] Through the roof stability assessment steps, the stability of the roof can be accurately assessed and corresponding support and surrounding rock control plans can be formulated to effectively prevent the occurrence of safety accidents such as roof collapse and spalling, and improve the safety of coal mining. Reasonable support and surrounding rock control plans can reduce surrounding rock damage and tunnel maintenance workload during mining, and improve mining efficiency. At the same time, a stable mining environment can also help improve the work efficiency and operation quality of miners. Through scientific support and surrounding rock control strategies, unnecessary support materials and manpower input can be reduced, and mining costs can be reduced. In addition, reasonable support design can also extend the service life of tunnels and mining sites, further reducing mining costs. The implementation of the roof stability assessment steps not only focuses on the safety and efficiency of the current mining process, but also takes into account the long-term sustainable development of coal mines. Through reasonable support and surrounding rock control, environmental damage and resource waste can be reduced, laying a solid foundation for the sustainable development of coal mines.

[0056] According to one embodiment of the present invention, the roof stability assessment step includes: Calculate at least one of the strength, thickness, bedding surface condition and combination of interlayer rock layers of the roof to comprehensively determine the bearing capacity and potential failure mode of the roof.

[0057] In a specific embodiment of the present invention, the roof stability assessment step is further refined and deepened. This step is not only based on the roof classification results, but also comprehensively judges the bearing capacity and potential failure mode of the roof by calculating multiple key parameters of the roof rock layer. These key parameters include the strength, thickness, bedding surface conditions of the roof rock layer, and the combination of interlayer rock layers.

[0058] Strength is an important indicator of rock's ability to resist destruction. Through laboratory tests or on-site tests, mechanical parameters such as uniaxial compressive strength and tensile strength of the roof rock layer are obtained. These parameters will be used to evaluate the roof's ability to resist deformation and destruction during mining.

[0059] Thickness is one of the important factors affecting roof stability. The thickness of the roof rock layer is accurately measured through drilling exploration, geological radar detection and other means. Changes in thickness will directly affect the overall strength and stability of the roof.

[0060] Bedding plane is a weak plane inside the rock formation, and its existence will significantly reduce the overall strength of the rock formation. By observing and analyzing the surface of the rock formation exposed in the drill core, outcrop or underground, the development degree, occurrence, spacing and other characteristics of the bedding plane are evaluated. These characteristics will be used to determine whether the roof is prone to slip or peeling along the bedding plane during mining.

[0061] The combination of interlayer rock layers determines the overall structure and stability of the roof rock layer. Based on the roof classification results and geological exploration data, the lithology, thickness, bedding surface conditions and other characteristics of the interlayer rock layers, as well as the contact relationship and interaction between them, are analyzed. These analyses will help predict the deformation and failure mode of the roof during mining.

[0062] After obtaining key parameters such as the strength, thickness, bedding plane condition and interlayer rock combination of the roof strata, a comprehensive evaluation is conducted using numerical simulation, physical simulation or empirical formulas. The impact of multiple factors such as mining disturbance and ground stress changes must be considered during the evaluation process to obtain quantitative indicators of the roof bearing capacity and prediction results of potential failure modes.

[0063] By comprehensively considering multiple key parameters of the roof rock layer, the bearing capacity and stability of the roof can be evaluated more comprehensively. This method avoids the one-sidedness and uncertainty of single parameter evaluation and improves the accuracy and reliability of the evaluation results. Based on the results of the roof stability evaluation, a more scientific support design scheme can be formulated. The support design will be customized according to the actual bearing capacity and potential failure mode of the roof to ensure the effectiveness and economy of the support measures. The results of the roof stability evaluation can also be used to optimize the mining plan. By predicting the deformation and failure mode of the roof during the mining process, the mining sequence, mining method and mining parameters can be reasonably adjusted to reduce the damage and disturbance to the roof and improve the mining efficiency and safety. Accurate roof stability evaluation helps to identify and prevent the occurrence of safety accidents such as roof collapse and spalling in advance. By taking effective support and surrounding rock control measures, the safety risks in the mining process can be significantly reduced and the lives of miners can be guaranteed.

[0064] According to one embodiment of the present invention, it also includes: Generate a roof classification report.

[0065] In one embodiment of the present invention, in order to systematically record and communicate the results of roof classification and related geological and engineering information, a step of generating a roof classification report is introduced. The report is not only a summary of the roof classification work, but also an important basis for subsequent support design, mining plan formulation and coal mine safety management.

[0066] Among them, all data collected during the roof classification process are sorted out, including but not limited to geological exploration data, drilling column charts, roof classification results, roof stability assessment parameters, etc. Ensure the accuracy and completeness of all data.

[0067] Generating a roof classification report makes the results of roof classification and stability assessment more transparent and traceable. This helps to enhance information transparency in the coal mining process and improve management efficiency. The roof classification report provides an important reference for subsequent support design, mining plan formulation and coal mine safety management. It helps relevant personnel to formulate work plans and measures more scientifically and reduce risks and costs in the mining process. The roof classification report is an important technical data accumulated in the coal mining process. By archiving and passing on these data, it will help the smooth development of subsequent projects and the continuous advancement of technology. The data and conclusions in the report provide strong support for the decision-making of coal mining enterprises. When faced with complex geological conditions and mining problems, enterprises can make more reasonable and scientific decisions based on the information in the report.

[0068] According to one embodiment of the present invention, the roof classification report can be electronically transmitted to the coal mine management system to guide the mining operation in real time.

[0069] In order to further improve the information level and real-time performance of coal mining, an embodiment of the present invention proposes a function of transmitting the roof classification report to the coal mine management system in an electronic manner. This innovation not only simplifies the report distribution process, but also realizes instant guidance of mining operations, improving work efficiency and safety.

[0070] When compiling the roof classification report, use an electronic document format (such as PDF, Word or a dedicated technical report template). This ensures that the report content is in a unified format, easy to edit and share. Develop or use an existing system integration interface to connect the coal mine management system with the roof classification report compilation system. This interface is responsible for achieving seamless transmission of report files from the compilation system to the management system.

[0071] Electronic transmission of roof classification reports avoids the cumbersome steps and time delays in the traditional paper report distribution process. This enables relevant personnel to obtain report information more quickly and make decisions and adjustments based on it, thereby improving work efficiency. The ability to access roof classification reports in real time allows mining operations to be adjusted and optimized based on the latest geological and engineering information. This helps reduce risks and losses caused by information asymmetry or lag.

[0072] According to one embodiment of the present invention, it also includes: The coal mine drill hole histogram is updated regularly, and the roof classification is re-performed according to the updated coal mine drill hole histogram.

[0073] In order to maintain the accuracy and timeliness of roof classification, an embodiment of the present invention proposes a step of regularly updating the coal mine drilling histogram and reclassifying the roof according to the updated histogram. The introduction of this step is intended to cope with possible changes in geological conditions during coal mining, ensure that the roof classification results are always consistent with the actual situation, and provide a reliable geological basis for mining operations.

[0074] According to the coal mining plan and the changes in geological conditions, a regular drilling exploration plan is formulated. The latest geological data, including the lithology, thickness, bedding surface status, etc. of the rock formations, are obtained through drilling exploration. The data obtained from the drilling exploration are compared and analyzed with the existing coal mine drilling column chart, and the changed rock formations are corrected and updated. The updated column chart should accurately reflect the geological structural characteristics of the current coal mining area. Based on the updated coal mine drilling column chart, the roof classification work is re-conducted. According to the new geological data, the lithology combination, thickness, bedding surface status and other characteristics of the roof are re-evaluated, and classified according to the roof classification standards and methods. The stability of the reclassified roof is evaluated, and the support design and mining plan are adjusted according to the evaluation results. Ensure the effectiveness of the support measures and the safety of the mining operation. The updated coal mine drilling column chart, roof classification results and the corresponding support design and mining plan adjustments are recorded and compiled into a report. The report should record the update process, classification results and adjustment measures in detail for subsequent review and reference.

[0075] Regularly updating the coal mine borehole column chart and reclassifying the roof can ensure that the roof classification results are always consistent with the actual situation and improve the accuracy of classification. Roof classification and stability assessment based on updated geological data can timely identify potential geological risks and take corresponding support and preventive measures to enhance the safety of mining operations. Adjusting the mining plan according to the updated roof classification results can more reasonably arrange the mining sequence, mining methods and support measures, and optimize mining efficiency and economy.

[0076] According to one embodiment of the present invention, the close-range coal seam roof classification method can at least be applied to close-range coal seam mining under different geological conditions.

[0077] The proposed method for classifying the roof of a close-range coal seam is designed to more accurately evaluate the roof stability during close-range coal seam mining, thereby optimizing the support design and mining plan, and improving mining efficiency and safety. Given the comprehensiveness and scientificity of this method in geological condition analysis and roof strength and stability assessment, it has wide applicability and scalability, and can at least be applied to close-range coal seam mining under different geological conditions.

[0078] In coal mining areas with complex geological structures and diverse rock formations, the stability and bearing capacity of the roof rock formations are often affected by multiple factors. The roof classification method of the present invention can comprehensively consider multiple factors such as the strength, thickness, bedding surface conditions and the combination of interlayer rock formations, and provide a scientific roof stability assessment basis for close-range coal seam mining under these complex geological conditions.

[0079] In the mining process of thin coal seams or very thin coal seams, roof control is particularly important. Due to the limited thickness of the coal seam, the deformation and damage of the roof rock layer have a more significant impact on the mining operation. By applying the roof classification method of the present invention, the stability and potential damage mode of the roof during the mining of thin coal seams can be more accurately evaluated, providing strong support for the formulation of effective support measures.

[0080] In the mining area where coal seams are superimposed or coal seams are mined in close proximity, the mining between different coal seams interferes with each other, and the roof stability problem becomes more prominent. The roof classification method of the present invention can classify and evaluate the roof characteristics of different coal seams, provide a basis for formulating a reasonable mining sequence and support plan, and reduce mutual influence and safety hazards during the mining process.

[0081] As coal mining develops deeper, problems such as increased ground stress and intensified rock deformation become increasingly prominent. The roof stability assessment of deep coal seams is more complex and difficult. By applying the roof classification method of the present invention, combined with the particularity of deep mining, the stability and potential risks of deep coal seam roofs can be more accurately assessed, providing a scientific basis for support design and safety management of deep mining.

[0082] A second aspect of the present invention provides a close-range coal seam roof classification device, comprising: An acquisition module is used to obtain the lithology composition of the interlayers of the upper and lower coal seams in close proximity; A determination module is used to determine that if the interlayer rock strata are composed of only one lithology, it is a single roof; if the interlayer rock strata are composed of two lithology strata, it is a combined roof; if the interlayer rock strata are composed of at least three lithology strata, it is a composite roof.

[0083] According to the second aspect of the present invention, an embodiment provides a close-range coal seam roof classification device. Through automated data acquisition and processing procedures, and intelligent classification algorithms, the classification device provided by the present invention can significantly improve the efficiency and accuracy of roof classification, and reduce the cost and time of manual intervention. Based on detailed geological data and scientific classification logic, the device can more accurately reflect the actual situation of the coal seam roof, and provide a reliable basis for subsequent mining design, support plan formulation, etc. The classification results can be directly applied to production management, safety risk prevention and control, and resource utilization of coal mining enterprises, providing strong support for enterprise decision-making and promoting the intelligent and efficient development of the coal mining industry.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for classifying coal seam roof at close range, characterized in that: include: Obtain the lithology composition of the interlayers of coal seams in close proximity; If the interlayer rock strata are composed of only one type of rock, it is a single roof; if the interlayer rock strata are composed of two types of rock strata, it is a combined roof; if the interlayer rock strata are composed of at least three types of rock strata, it is a composite roof.

2. The method for classifying the roof of a coal seam at a short distance according to claim 1, characterized in that: Also includes: The step of evaluating the interlayer spacing is used to assist in determining the classification of the top plate. If the interlayer spacing is less than the first interlayer preset spacing, it is a single top plate. If the interlayer spacing is greater than the first interlayer preset spacing and less than the second interlayer preset spacing, it is a combined top plate. If the interlayer spacing is greater than the second interlayer preset spacing, it is a composite top plate, wherein the first interlayer preset spacing is less than the second interlayer preset spacing, and the second interlayer preset spacing is less than the third interlayer preset spacing.

3. The method for classifying the roof of a coal seam at a short distance according to claim 1, characterized in that: The step of obtaining the lithology composition of the interlayer rock strata between the upper and lower coal seams in close proximity includes: The analysis is performed based on the coal mine drilling column chart data, and the lithology composition is determined by identifying the rock formation information in the column chart.

4. The method for classifying the roof of a coal seam at a short distance according to claim 1, characterized in that: Also includes: The roof stability assessment step determines the support of the lower coal seam mining tunnel and the surrounding rock control of the lower coal seam mining area based on the roof classification results.

5. The method for classifying the roof of a coal seam at a short distance according to claim 4, characterized in that: The roof stability assessment step includes: Calculate at least one of the strength, thickness, bedding surface condition and combination of interlayer rock layers of the roof to comprehensively determine the bearing capacity and potential failure mode of the roof.

6. The method for classifying the roof of a coal seam at a short distance according to any one of claims 1 to 5, characterized in that: Also includes: Generate a roof classification report.

7. The method for classifying the roof of a coal seam at a short distance according to claim 6, characterized in that: The roof classification report can be electronically transmitted to the coal mine management system to guide mining operations in real time.

8. The method for classifying the roof of a coal seam at a short distance according to any one of claims 1 to 5, characterized in that: Also includes: The coal mine borehole histogram is updated regularly, and the roof classification is re-performed based on the updated coal mine borehole histogram.

9. The method for classifying the roof of a coal seam at a short distance according to any one of claims 1 to 5, characterized in that: The close-range coal seam roof classification method can at least be applied to close-range coal seam mining under different geological conditions.

10. A close-range coal seam roof classification device, characterized in that: include: An acquisition module is used to obtain the lithology composition of the interlayers of the upper and lower coal seams in close proximity; A determination module is used to determine that if the interlayer rock strata are composed of only one lithology, it is a single roof; if the interlayer rock strata are composed of two lithology strata, it is a combined roof; if the interlayer rock strata are composed of at least three lithology strata, it is a composite roof.

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