Method and device for determining mining parameters of end slope coal, electronic equipment and readable storage medium

Abstract

The invention discloses a method and a device for determining mining parameters of end slope coal, electronic equipment and a readable storage medium. The method is applied to a power monitoring system, and comprises the following steps: acquiring a geological exploration report of an end slope coal recovery area; based on the geological exploration report, respectively determining span stability information of a top plate of the end slope coal recovery area and a safety coefficient of a coal pillar in the end slope coal recovery area; on the basis of the span stability information and the safety coefficient, initial mining parameters for mining the end slope coal in the end slope coal recovery area are determined; the slope stability safety coefficient of the end slope coal recovery area under the initial mining parameters is determined, and the slope stability safety coefficient is used for at least representing the slope sliding resistance performance of the end slope recovery area; based on the slope stability safety coefficient, the initial mining parameters are adjusted, and target mining parameters are obtained. The technical problem that safety is low in the end slope coal mining process is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of coal resource mining, and in particular to a method, device, electronic equipment and readable storage medium for determining mining parameters of end-wall coal. Background Art

[0002] At present, after underground coal resources are mined using open-pit mining, huge mine pits and end walls will be formed, with a large amount of coal resources left at the end walls. The existence of this part of coal not only reduces the resource recovery rate, but also may pose a potential threat to the long-term stability of the mine.

[0003] In the related technology, the end wall coal recovery mainly adopts the chamber mining technology, that is, excavating a chamber in the end wall area for coal mining. However, due to the inability to accurately determine the appropriate chamber parameters, such as width, height, coal pillar width, etc., the safety of the end wall coal recovery process is relatively low.

[0004] With respect to the above-mentioned technical problem that the network configuration strategy of the network equipment in the power monitoring system cannot be effectively and comprehensively verified and adjusted, no effective solution has been proposed yet. Summary of the invention

[0005] The embodiments of the present invention provide a method, device, electronic device and readable storage medium for determining mining parameters of end-wall coal, so as to at least solve the technical problem of low safety in the end-wall coal mining process.

[0006] According to one aspect of an embodiment of the present invention, a method for determining mining parameters of end-wall coal is provided. The method may include: obtaining a geological exploration report of an end-wall coal mining area, wherein the geological exploration report is at least used to characterize the geological conditions of the end-wall coal mining area; based on the geological exploration report, respectively determining the span stability information of the roof of the end-wall coal mining area and the safety factor of the coal pillar in the end-wall coal mining area, wherein the span stability information is used to characterize the maximum span of the roof to maintain stability under unsupported conditions, and the safety factor of the coal pillar is used to characterize the structural stability of the coal pillar when subjected to rock pressure from the roof; based on the span stability information and the safety factor, determining the initial mining parameters for mining the end-wall coal in the end-wall coal mining area; determining the slope stability safety factor of the end-wall coal mining area under the initial mining parameters, wherein the slope stability safety factor is used to at least characterize the performance of the slope in the end-wall coal mining area in resisting sliding; based on the slope stability safety factor, adjusting the initial mining parameters to obtain the target mining parameters.

[0007] Optionally, based on the geological exploration report, the span stability information of the roof of the end-wall coal mining area is determined, including: extracting the rock quality index in the end-wall coal mining area, the rock strength in the end-wall coal mining area, the joint spacing of the rock in the end-wall coal mining area, the joint state of the rock in the end-wall coal mining area and the water content of the rock in the end-wall coal mining area from the geological exploration report; determining a first score of the rock grade corresponding to the rock quality index, a second score corresponding to the rock strength, a third score corresponding to the joint spacing of the rock, a fourth score corresponding to the joint state of the rock and a water content of the rock a fifth score corresponding to the amount of water; determining an initial score for rock quality based on the first score, the second score, the third score, the fourth score and the fifth score; determining an initial score for rock quality based on the end-wall coal mining area, wherein the initial score is used to characterize the rock quality obtained by preliminary evaluation of the rock in the end-wall coal mining area; correcting the initial score based on the relationship between the joint orientation of the rock in the end-wall coal mining area and the spatial position of the tunnel for mining the end-wall coal to obtain a target score for rock quality; determining the span stability information of the roof of the end-wall coal mining area based on the target score.

[0008] Optionally, based on the target score, the span stability information of the roof of the end side coal mining area is determined, including: based on the target score, dividing the rocks in the end side coal mining area into different categories, wherein the stability, rock cohesion and internal friction angle corresponding to different categories of rocks are different; based on the stability, rock cohesion and internal friction angle corresponding to different categories of rocks, the span stability information of the roof of the end side coal mining area is determined.

[0009] Optionally, based on the geological exploration report, the safety factor of the coal pillar in the end-wall coal mining area is determined, including: determining the strength of the coal pillar in the end-wall coal mining area based on the geological exploration report; determining the average stress load of the coal pillar based on the auxiliary area method; determining the safety factor of the coal pillar based on the ratio of the strength of the coal pillar to the average stress load of the coal pillar.

[0010] Optionally, the safety factor of the coal pillar includes at least a temporary coal pillar safety factor and a permanent coal pillar safety factor, wherein the temporary coal pillar safety factor is used to characterize the safety of the coal pillar temporarily left in the end wall coal mining area during the end wall coal mining process when it withstands the rock located above the end wall coal mining area, and the permanent coal pillar safety factor is used to characterize the safety of the coal pillar permanently left in the end wall coal mining area when it withstands the rock located above the end wall coal mining area.

[0011] Optionally, determining the slope stability safety factor of the end side coal mining area under the initial mining parameters includes: performing numerical analysis on the initial mining parameters based on a pre-established end side numerical model, and determining the slope stability safety factor of the end side coal mining area under the initial mining parameters.

[0012] Optionally, the method for determining the mining parameters of the end-wall coal further includes: mining the end-wall coal in the end-wall coal mining area based on the target mining parameters.

[0013] According to another aspect of an embodiment of the present invention, a device for determining mining parameters of end-wall coal is also provided. The device may include: an acquisition unit, used to acquire a geological exploration report of an end-wall coal mining area, wherein the geological exploration report is at least used to characterize the geological conditions of the end-wall coal mining area; a first determination unit, used to determine the span stability information of the roof of the end-wall coal mining area and the safety factor of the coal pillar in the end-wall coal mining area based on the geological exploration report, wherein the span stability information is used to characterize the maximum span of the roof to maintain stability under unsupported conditions, and the safety factor of the coal pillar is used to characterize the structural stability of the coal pillar when subjected to rock pressure from the roof; a second determination unit, used to determine the initial mining parameters for mining the end-wall coal in the end-wall coal mining area based on the span stability information and the safety factor; a third determination unit, used to determine the slope stability safety factor of the end-wall coal mining area under the initial mining parameters, wherein the slope stability safety factor is used to at least characterize the performance of the slope in the end-wall coal mining area in resisting sliding; an adjustment unit, used to adjust the initial mining parameters based on the slope stability safety factor to obtain target mining parameters.

[0014] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is also provided, which includes a stored program, wherein when the program is executed by a processor, the device where the storage medium is located is controlled to execute the method for determining the mining parameters of the end coal in an embodiment of the present invention.

[0015] According to another aspect of the embodiment of the present invention, a processor is provided, which is used to run a program, wherein when the program is run, the method for determining mining parameters of end-wall coal in the embodiment of the present invention is executed.

[0016] According to another aspect of the embodiment of the present invention, a computer program product is provided, which includes computer instructions, and when the computer instructions are executed by a processor, the method for determining mining parameters of end-wall coal in the embodiment of the present invention is implemented.

[0017] In the embodiment of the present invention, by analyzing the geological exploration report, not only the span stability of the roof in the end-wall coal mining area is paid attention to, but also the support stability of the coal pillar and the stability of the slope are evaluated. Based on these key indicators, reasonable mining parameters that can ensure the safety of the mining process and maximize resource recovery can be determined, effectively avoiding dangerous events such as roof collapse, coal pillar instability and slope sliding that may occur during the mining process, significantly improving the safety of end-wall coal mining, and thus solving the technical problem of low safety in the end-wall coal mining process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 is a flow chart of a method for determining mining parameters of end-to-end coal according to an embodiment of the present invention;

[0020] Figure 2 is a graph showing the variation of unsupported span and stabilization time with RMR value according to an embodiment of the present invention;

[0021] Figure 3 is a schematic diagram of a slope model including a chamber group according to an embodiment of the present invention;

[0022] Figure 4 It is a schematic diagram of a device for determining mining parameters of end coal according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0024] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, functional component or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, functional components or devices.

[0025] According to an embodiment of the present invention, an embodiment of a method for determining mining parameters of end coal is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0026] Figure 1 FIG. 1 is a flow chart of a method for determining mining parameters of end-to-end coal according to an embodiment of the present invention. Figure 1 As shown, the method may include the following steps:

[0027] Step S101, obtaining a geological exploration report of the end coal mining area.

[0028] In the technical solution provided in the above step S101 of the present invention, the geological exploration report is at least used to indicate the geological conditions of the end-wall coal mining area. It should be noted that the geological exploration report provides detailed geological information of the end-wall coal mining area, including rock type, rock quality, rock strength, joint distribution, groundwater conditions, etc. This information is the basis for evaluating rock mass stability, coal pillar strength and slope safety. Through the geological exploration report, rock quality grades can be divided, the structural integrity of the roof rock can be evaluated, the supporting capacity of the coal pillar and the stability of the slope can be determined, thereby guiding the design of the mining tunnel and the determination of mining parameters.

[0029] In this embodiment, a geological exploration report of the end coal mining area can be obtained, and then the rock quality grade around the end coal mining area can be divided according to the geological exploration report, and then the integrity and quality grade of the rock can be evaluated through the rock quality index (Rock Quality Designation, referred to as RQD).

[0030] Optionally, the geological exploration report of the end-wall coal mining area can also be used to determine the strength parameters of the intact rock, including: uniaxial compressive strength, point load strength, etc., which are used to evaluate the physical and mechanical properties of the rock.

[0031] Optionally, the geological exploration report of the end-wall coal mining area can also determine the joint spacing, joint state and occurrence information of the rock, which affects the connectivity and stability of the rock.

[0032] Optionally, the geological exploration report of the end-wall coal mining area can also be used to determine the groundwater conditions in the end-wall coal mining area. Groundwater has a significant impact on the stability of the rock mass and the supporting capacity of the coal pillar.

[0033] Step S102, based on the geological exploration report, respectively determine the span stability information of the roof of the end-wall coal mining area and the safety factor of the coal pillar in the end-wall coal mining area.

[0034] In the technical solution provided in the above step S102 of the present invention, the span stability information is used to characterize the maximum span of the roof that maintains stability without support, and the safety factor of the coal pillar is used to characterize the structural stability of the coal pillar when it is subjected to rock pressure from the roof.

[0035] In this embodiment, the roof span stability is comprehensively evaluated by the rock mass rating (RMR) method. The RMR method is a technology for systematically evaluating rock mass quality. The RMR value of the roof rock mass is obtained by comprehensive calculation based on multiple parameters such as rock quality, intact rock strength, joint spacing and state, and surrounding rock water content. The size of the RMR value reflects the quality of the rock mass, and thus guides the design of the width of the mining roof.

[0036] For example, the rock quality index (RQD value), rock strength, joint information and groundwater conditions in the geological exploration report are analyzed, and the roof rock mass is scored individually based on these data. According to the relationship between the joint occurrence and the tunnel engineering, the preliminary individual scores are corrected to obtain the RMR value after considering the influence of the joints; through the rock engineering classification table, the stability category of the roof rock mass, as well as the corresponding average self-stabilization time and rock mass stability parameters are determined according to the calculated RMR value; the maximum span for the roof to maintain stability under unsupported conditions is determined by using the change of unsupported span and stabilization time with RMR value, that is, the appropriate width design of the mining roof to ensure that the roof will not become unstable due to excessive span during mining.

[0037] Optionally, the strength of the coal pillar is calculated using the Mark-Bieniawski formula in combination with the rock mass stability analysis results and the coal seam laboratory test strength data, wherein the Mark-Bieniawski formula is as follows:

[0038]

[0039] Among them, S p Used to indicate the strength of the coal pillar, in megapascal (MPa); S1 is used to indicate the strength of the original coal pillar, in MPa; W is used to indicate the width of the coal pillar, in meter (m); H is used to indicate the height of the coal pillar, in m.

[0040] Optionally, the average stress load of the coal pillar is calculated by the auxiliary area method. The ratio of the coal pillar strength to the average stress load of the coal pillar is defined as the support stability safety factor of the coal pillar. The average stress load of the coal pillar can be calculated by the following formula.

[0041]

[0042] Among them, P is used to indicate the coal pillar load, with the unit of (MPa); r is used to indicate the average bulk density of the overlying rock strata, with the unit of (MPa / m); h is used to indicate the thickness of the overlying rock strata, with the unit of m; W is used to indicate the width of the coal pillar, with the unit of (m); B is used to indicate the width of the mining shaft, with the unit of (m); and L is used to indicate the length of the coal pillar, with the unit of (m).

[0043] Optionally, after the strength of the coal pillar and the average stress load of the coal pillar are determined, the strength of the coal pillar and the average stress load of the coal pillar may be compared to obtain a safety factor of the coal pillar support stability.

[0044] Optionally, the coal pillar support stability safety factor may include a temporary coal pillar safety factor and a permanent coal pillar safety factor, and this standard is used to judge whether the support stability of the coal pillar meets the requirements, ensuring that the coal pillar can safely support the roof rock pressure during the mining process and avoid structural damage to the coal pillar.

[0045] Step S103, based on the span stability information and the safety factor, determine the initial mining parameters for mining the end side coal in the end side coal recovery area.

[0046] In the technical solution provided in the above step S103 of the present invention, the initial mining parameters include the width and height of the mining tunnel, the width of the coal pillar, the mining depth, etc.

[0047] In this embodiment, the roof span stability information obtained through the RMR method can determine the maximum stable width of the mining tunnel under unsupported conditions. This step ensures that the designed width of the mining tunnel will not cause roof instability due to excessive span, reducing the risk of roof collapse during mining.

[0048] Optionally, the width of the coal pillar can be determined based on the safety factor of the support stability of the coal pillar, combined with the requirements of temporary coal pillars (safety factor>1.6) and permanent coal pillars (safety factor>2.0). The appropriate width of the coal pillar can ensure that the coal pillar can stably support the roof during mining and avoid structural damage caused by too narrow coal pillars.

[0049] Optionally, the roof span stability information and the safety factor of the coal pillar support stability are comprehensively considered, and combined with the results of the slope stability analysis, the initial mining parameters including the width and height of the mining tunnel, the width of the coal pillar and the mining depth are determined. These parameters must ensure that the entire mining process will not have an adverse effect on the slope stability, while also taking into account the coal recovery efficiency and economy.

[0050] Step S104, determining the slope stability safety factor of the coal recovery area at the lower end of the initial mining parameters.

[0051] In the technical solution provided in the above step S104 of the present invention, after determining the initial mining parameters, the slope stability safety factor of the end side coal mining area below the initial mining parameters can be further determined. The slope stability safety factor is used to at least characterize the performance of the slope in the end side coal mining area in resisting sliding.

[0052] In this embodiment, after preliminarily determining key parameters such as the width and height of the mining tunnel, as well as the width of the coal pillar and the mining depth, the next step is to evaluate the impact of these parameters on the slope stability through numerical simulation analysis, and finally determine the slope stability safety factor.

[0053] Optionally, a finite element analysis software is used to establish a slope model of the end-wall coal mining area. The rock mechanics parameters, mining parameters, groundwater conditions and other information provided in the geological exploration report should be input in detail into the model. By simulating the stress field and displacement field of the slope under different mining conditions, the stability of the slope is evaluated and the safety factor of the slope stability is calculated.

[0054] In this step, after the mining parameters are preliminarily determined, the stability of the slope when the preliminary mining parameters are used to mine the end coal under various working conditions can be further evaluated, and the corresponding slope stability safety factor can be determined. This can ensure that the mining activities will not cause the key to slope instability, thereby avoiding possible geological disasters and casualties, and ensuring the safety and sustainability of mining.

[0055] Step S105, adjusting the initial mining parameters based on the slope stability safety factor to obtain target mining parameters.

[0056] In the technical solution provided in the above step S105 of the present application, after evaluating the slope stability safety factor under various working conditions, if the slope stability safety factor under a certain working condition is lower than the design requirements, it means that the mining parameters (such as the width, height or depth of the mining tunnel, etc.) under the working condition may pose a threat to the slope stability. At this time, it is necessary to adjust the mining parameters, such as reducing the width of the mining tunnel, increasing the width of the coal pillar, or reducing the mining depth, and then re-perform the numerical simulation until the slope stability safety factor under all working conditions meets the design requirements.

[0057] In this embodiment, the initial mining parameters are adjusted based on the slope stability safety factor to obtain target mining parameters. The adjusted target mining parameters can ensure that the slope remains stable during the mining process, avoid slope accidents caused by improper mining, and improve the safety of the mine.

[0058] In the above steps S101 to S105, by analyzing the geological exploration report, not only the span stability of the roof in the end-side coal mining area is focused on, but also the support stability of the coal pillar and the stability of the slope are evaluated. Based on these key indicators, reasonable mining parameters that can ensure the safety of the mining process and maximize resource recovery can be determined, effectively avoiding dangerous events such as roof collapse, coal pillar instability and slope sliding that may occur during the mining process, significantly improving the safety of end-side coal mining, and thus solving the technical problem of low safety during end-side coal mining.

[0059] The above method of this embodiment is further introduced below.

[0060] As an optional implementation method, step S102, based on the geological exploration report, determines the span stability information of the roof of the end-side coal mining area, including: extracting the rock quality index in the end-side coal mining area, the rock strength in the end-side coal mining area, the joint spacing of the rock in the end-side coal mining area, the joint state of the rock in the end-side coal mining area, and the water content of the rock in the end-side coal mining area from the geological exploration report; determining a first score of the rock grade corresponding to the rock quality index, a second score corresponding to the rock strength, a third score corresponding to the joint spacing of the rock, and a fourth score corresponding to the joint state of the rock. The first score and the fifth score corresponding to the water content of the rock are used to determine the initial score of the rock quality based on the first score, the second score, the third score, the fourth score and the fifth score; the initial score of the rock quality in the end-wall coal mining area is determined based on the initial score, wherein the initial score is used to characterize the rock quality obtained by preliminary evaluation of the rock in the end-wall coal mining area; the initial score is corrected based on the relationship between the joint trend of the rock in the end-wall coal mining area and the spatial position of the tunnel for mining the end-wall coal to obtain the target score of the rock quality; based on the target score, the span stability information of the roof of the end-wall coal mining area is determined.

[0061] In this embodiment, geological information related to the end coal mining area is extracted from the geological exploration report, including rock quality index RQD, rock strength (mainly intact rock strength and uniaxial compressive strength), joint spacing, joint state (such as the roughness of the joint surface, the opening width of the joint and the degree of weathering of the two wall rocks) and rock water content (characterized by the water inflow of the chamber).

[0062] Optionally, based on the extracted data, determine a first score for rock grade corresponding to the rock quality indicator RQD, a second score for rock strength, a third score for rock joint spacing, a fourth score for rock joint state, and a fifth score for rock water content.

[0063] Optionally, Table 1 is a rock quality grade table according to an embodiment of the present invention, which is used to classify rocks according to the quality index RQD of the rocks to evaluate the integrity and stability of the rocks. As shown in Table 1, the rocks are divided into five grades according to their quality, from grade I to grade V, grade I indicates the best rock quality, and grade V indicates the worst rock quality. The RQD value is an important indicator for evaluating rock quality, which is defined as the percentage of the cumulative length of the core section with a length greater than 10 cm in the borehole to the total length of the borehole. The higher the RQD value, the more complete the rock and the better the quality. In Table 1, the RQD value is divided into five intervals: 90-100%, 75-90%, 50-75%, 25-50% and 0-25%, corresponding to rock grades I to V, respectively. Based on Table 1, the quality grade of the rock can be evaluated.

[0064] Table 1 Rock quality grade table

[0065]

[0066] Optionally, Table 2 is a rock engineering classification parameter and scoring standard table according to an embodiment of the present invention. As shown in Table 2, five key factors affecting rock stability are listed in detail, including intact rock strength, RQD value (rock quality index), joint spacing, joint state and surrounding rock water content, as well as the corresponding scores of these factors.

[0067] Table 2 Rock mass engineering classification parameters and scoring standards

[0068]

[0069] Alternatively, as shown in Table 2, for intact rock strength: the strength of rock when it is not affected by joints, cracks, etc., usually expressed by point load strength or uniaxial compressive strength. The higher the point load strength and uniaxial compressive strength, the harder the rock and the better the stability. The scoring criteria gradually decrease from 15 points (highest) to 0 points (lowest), matching the decrease in rock strength from >10MPa to <1MPa; the RQD value reflects the length ratio of intact cores in the rock. For the higher the RQD value, the greater the proportion of long cores in the rock, the more intact the rock, and the better the stability. The scoring criteria decrease from 20 points (highest) to 3 points (lowest), corresponding to the decrease in RQD values ​​from 90% to less than 25%. For joint spacing: the average distance between joints (i.e., cracks or fractures) in the rock. The larger the joint spacing, the fewer cracks inside the rock, the more continuous the rock mass, and the better the stability. The scoring criteria gradually decrease from 20 points (highest) to 5 points (lowest), matching the decrease in joint spacing from more than 200cm to less than 6cm. For joint status: describes the surface status, opening degree and filling conditions of joints, reflecting the influence of joints on rock mass stability. The better the joint status, the smaller the negative impact of joints on rock mass and the higher the stability of rock mass. The scoring criteria decrease from 30 points (highest) to 0 points (lowest), corresponding to the decrease in joint status from "joint surface is very rough, not connected, closed, and the rock on both walls is fresh" to "joint is connected, mud thickness>5mm, or opening width>5m". For surrounding rock water content: reflects the water content in the surrounding rock, which has an important influence on rock mass stability. The drier the rock mass, the better its stability is usually. The scoring criteria gradually decrease from 15 points (highest) to 0 points (lowest), corresponding to the increase in surrounding rock water content from dry to gushing.

[0070] Optionally, based on the mapping relationship between the joint spacing and the score shown in Table 2, the third score corresponding to the joint spacing of the rock can be determined; based on the mapping relationship between the joint state and the score shown in Table 2, the fourth score corresponding to the joint state of the rock can be determined; based on the mapping relationship between the water content of the surrounding rock and the score shown in Table 2, the fifth score corresponding to the water content of the rock can be determined.

[0071] Optionally, the initial score obtained by accumulating the first score, the second score, the third score, the fourth score and the fifth score is the largest, indicating that the rock quality of the end coal mining area is higher.

[0072] Optionally, after obtaining the initial score, the initial score can be corrected according to the relationship between the joint orientation of the rock in the end-wall coal mining area and the spatial position of the tunnel for mining the end-wall coal to obtain a target score for the rock quality.

[0073] Optionally, Table 3 is a score correction value table for the relationship between joint occurrence and tunnel excavation construction according to an embodiment of the present invention. The purpose of its design is to more accurately evaluate the stability of rock mass in tunnel excavation. By considering the strike, inclination and relationship with the axis and inclination of the joints, the RMR (Rock Mass Rating) score is corrected, thereby providing a rock mass stability evaluation that is closer to the actual rock mass conditions. As shown in Table 3, the relationship between the strike of joints (cracks or faults in rocks) and the axis and inclination of the tunnel (the direction of the tunnel relative to the rock formation) is described. According to the relationship between the direction of tunnel excavation and the inclination of the rock formation, it is divided into the inclination direction, that is, excavation along the inclination direction of the rock formation, and the inclination direction, that is, excavation against the inclination direction of the rock formation, and the two have different effects on the stability of the tunnel. The inclination angle of the joint relative to the horizontal plane is divided into multiple intervals, from 45° to 90° (nearly vertical) to 0° to 20° (nearly horizontal), and the joints with different inclination angles have different degrees of influence on the stability of the tunnel. The influence of the relationship between the above joint occurrence and the tunneling direction on the stability of the tunnel is divided into five levels: "most favorable", "favorable", "acceptable", "unfavorable" to "most unfavorable". These descriptions reflect the degree of positive to negative impact of the joint occurrence on the stability of the tunnel. Based on the description of the degree of impact, the RMR score is corrected, and the correction value ranges from 0 (no negative correction) to -12 (maximum negative correction). A positive number indicates a positive impact on the stability of the rock mass, but all the correction values ​​in the table are negative, which means that the joint occurrence in all cases will reduce the RMR score to a certain extent, thereby reflecting its potential negative impact on the stability of the rock mass.

[0074] Table 3 Correction table for the correlation between joint occurrence and tunnel excavation construction

[0075]

[0076] Alternatively, as shown in Table 3, assuming that during tunnel excavation, a joint with a dip angle of 45° to 90° is encountered, and its strike is perpendicular to the tunnel axis, and excavation is carried out along the dip. In this case, the influence of the joint on the rock mass stability is "most favorable", and the RMR score correction value is 0, which means that there will be no negative impact on the RMR score.

[0077] Alternatively, if the joint dip angle is between 20° and 45° and the strike is parallel to the tunnel axis, the impact is “most unfavorable” when excavating against the dip, and the RMR score correction value is -12, which means that when calculating the total RMR score, the occurrence of this part of the joints will significantly reduce the stability score of the rock mass.

[0078] Optionally, the initial score can be corrected according to the correction value of the RMR score shown in Table 3 to obtain the target score of rock quality. The target score can reflect the stability of the rock mass under the specific rock mass, joint occurrence and tunnel construction conditions, providing a more scientific and safe basis for mining design.

[0079] As an optional implementation method, the span stability information of the roof of the end side coal mining area is determined based on the target score, including: based on the target score, the rocks in the end side coal mining area are divided into different categories, wherein the stability, rock cohesion and internal friction angle corresponding to different categories of rocks are different; based on the stability, rock cohesion and internal friction angle corresponding to different categories of rocks, the span stability information of the roof of the end side coal mining area is determined.

[0080] In this embodiment, as described above, the target score (RMR) is a score of the quantified rock mass quality obtained by comprehensively considering factors such as rock quality index RQD, intact rock strength, joint state, joint spacing, and surrounding rock water content. The RMR value reflects the stability, strength, and self-stabilizing ability of the rock mass.

[0081] Optionally, the rock is divided into five different categories (I to V) based on the calculated RMR values. Each category corresponds to a different description of rock quality (from "best" to "worst"), rock mass stability, rock mass cohesion and internal friction angle, which are directly related to the self-stabilization time and possible maximum span of the rock under unsupported conditions.

[0082] Optionally, Table 4 is a rock mass engineering classification table according to an embodiment of the present invention. As shown in Table 4, the assessed rock mass quality is classified, and the stability description, RMR score range, average self-stabilization time, cohesion and internal friction angle estimation of each type of rock mass are given. Among them, for rock grade, based on the quality of the rock, the rock mass is divided into five grades, from rock grade I to rock grade V, rock grade I represents the best quality rock, and rock grade V represents the worst quality rock; for rock quality, the quality of each rock grade is described, such as rock grade I is described as "best" and rock grade V is described as "worst". These descriptions help engineers intuitively understand the integrity, stability and performance of the rock mass in engineering operations; for rock mass scoring RMR, it is used to quantify the quality of the rock. The higher the score, the better and more stable the rock mass quality. The table lists the RMR score range corresponding to the rock grade, such as the RMR score range of rock grade I is 81 to 100; for average self-stabilization time, it is used to indicate the time that the rock mass can remain stable under unsupported conditions. This is usually related to the span and integrity of the rock mass. The larger the span, the shorter the self-stabilization time. The table shows the average self-stabilization time corresponding to different rock grades. For example, for rock mass of rock grade I, when the span is 5 meters, the average self-stabilization time is 10 years; for cohesion / kPa and internal friction angle, two key parameters that can reflect the shear strength of the rock mass. Cohesion refers to the bonding force between rock particles, while the internal friction angle reflects the friction resistance when rock particles slide against each other. These two parameters directly affect the shear strength of the rock mass, and then affect the stability of the rock mass. The table shows the cohesion range and internal friction angle range corresponding to different rock grades. For example, for rock mass of rock grade I, the cohesion is greater than 300kPa and the internal friction angle is greater than 45°.

[0083] Table 4 Rock mass engineering classification table

[0084]

[0085] Alternatively, according to the target score (rock mass score RMR), the rock mass stability, rock mass cohesion and internal friction angle of the corresponding rock type can be found from Table 4. These parameters are the key basis for evaluating rock mass stability.

[0086] Optionally, Figure 2 is a graph showing the variation of the unsupported span and the stabilization time with the RMR value according to an embodiment of the present invention. According to the RMR value and the rock mass parameters, the Figure 2 To determine the maximum stable span of the roof without support. This information is crucial for designing the width of the mining tunnel to ensure that the roof can remain stable during mining and avoid the risk of collapse.

[0087] For example, if the rock mass in a certain area is classified as Class II according to the geological exploration report and the RMR scoring method, the corresponding RMR value range is between 61 and 80. By referring to Table 4, it can be known that the average self-stabilization time of this type of rock mass is 6 months for a span of 4m, the corresponding rock mass cohesion is between 200 and 300 kPa, and the internal friction angle is between 40° and 45°. Figure 1 , the maximum stable span of the unsupported roof under such rock conditions can be determined, thereby guiding the selection of roof width during mining design and ensuring safety during the mining process.

[0088] As an optional implementation, based on the geological exploration report, the safety factor of the coal pillar in the end-wall coal mining area is determined, including: determining the strength of the coal pillar in the end-wall coal mining area based on the geological exploration report; determining the average stress load of the coal pillar based on the auxiliary area method; determining the safety factor of the coal pillar based on the ratio of the strength of the coal pillar to the average stress load of the coal pillar.

[0089] In this embodiment, the coal seam rock property data provided in the geological exploration report, including the laboratory test strength of coal, is used in combination with the Mark-Bieniawski formula to calculate the strength S of the coal pillar. p Among them, the Mark-Bieniawski formula takes into account the geometric parameters of the coal pillar, such as width W and height H, as well as the strength S1 of the original coal pillar. The Mark-Bieniawski formula is as follows:

[0090]

[0091] Optionally, the average stress load of the coal pillar is calculated using the auxiliary area method. The auxiliary area method is a method for calculating the overburden pressure of a rock structure, and is applicable to a specific structure such as a coal pillar. The average stress load of the coal pillar calculated using the auxiliary area method can be expressed by the following formula.

[0092]

[0093] Among them, P is used to indicate the coal pillar load, with the unit of (MPa); r is used to indicate the average bulk density of the overlying rock strata, with the unit of (MPa / m); h is used to indicate the thickness of the overlying rock strata, with the unit of m; W is used to indicate the width of the coal pillar, with the unit of (m); B is used to indicate the width of the mining shaft, with the unit of (m); and L is used to indicate the length of the coal pillar, with the unit of (m).

[0094] Optionally, after the strength of the coal pillar and the average stress load of the coal pillar are determined, the strength of the coal pillar and the average stress load of the coal pillar may be compared to obtain a safety factor of the coal pillar support stability.

[0095] Optionally, the coal pillar support stability safety factor includes a temporary coal pillar safety factor and a permanent coal pillar safety factor, wherein the safety factor of the temporary coal pillar should be greater than 1.6 and the safety factor of the permanent coal pillar should be greater than 2.0 to ensure the safety and stability of the coal pillar during the mining process.

[0096] As an optional implementation method, the safety factor of the coal pillar includes at least a temporary coal pillar safety factor and a permanent coal pillar safety factor, wherein the temporary coal pillar safety factor is used to characterize the safety level of the coal pillar temporarily left in the end side coal mining area during the end side coal mining process when it withstands the rock located above the end side coal mining area, and the permanent coal pillar safety factor is used to characterize the safety level of the coal pillar permanently left in the end side coal mining area when it withstands the rock located above the end side coal mining area.

[0097] In this embodiment, the safety factor of coal pillar support stability includes the safety factor of temporary coal pillar and the safety factor of permanent coal pillar, wherein the safety factor of temporary coal pillar should be greater than 1.6, that is, the support capacity of temporary coal pillar should be at least 1.6 times of the pressure to be borne, to ensure sufficient safety margin. The safety factor of permanent coal pillar should be greater than 2.0, that is, the support capacity of permanent coal pillar should be at least 2.0 times of the pressure to be borne, to ensure its stability under long-term environmental changes.

[0098] As an optional implementation method, step S104 determines the slope stability safety factor of the end coal mining area under the initial mining parameters, including: performing numerical analysis on the initial mining parameters based on a pre-established end numerical model, and determining the slope stability safety factor of the end coal mining area under the initial mining parameters.

[0099] In this embodiment, as can be seen from the above introduction, the initial mining parameters may include: the width and height of the mining tunnel, the width of the coal pillar and the mining depth, etc. Based on this, numerical analysis can be used to verify the influence of these parameters on the slope stability, calculate the slope stability safety factor, and evaluate whether the slope can remain stable under these parameters.

[0100] Optionally, a numerical model is run to perform simulation analysis to evaluate the stress field distribution, displacement and stability of the slope under different working conditions (i.e. different mining parameters). Through simulation analysis, high stress areas or potential sliding surfaces that may cause slope instability can be identified.

[0101] Optionally, a slope stability safety factor is calculated based on the simulation results. This usually involves comparing the shear strength of the slope with the shear force at the edge, with the safety factor being defined as the ratio of the slope shear strength to the shear force. A factor greater than 1 indicates a stable slope, with larger values ​​indicating a more stable slope.

[0102] Optionally, Figure 3is a schematic diagram of a slope model including a chamber group according to an embodiment of the present invention, such as Figure 3 As shown, the relationship between the mining chamber group and the slope structure in the end-wall coal mining area is demonstrated, wherein the mining chamber group (or chamber group) is usually distributed along the end-wall coal seam of the slope, and may include a series of parallel or staggered mining chambers, each of which has its specific width, height and depth.

[0103] As an optional implementation, the method for determining the mining parameters of the end-wall coal further includes: mining the end-wall coal in the end-wall coal mining area based on the target mining parameters.

[0104] In this embodiment, after determining the target mining parameters, the end coal in the end coal recovery area can be mined according to the optimal width and height of the mining tunnel, the width of the coal pillar, and the mining depth included in these parameters, so as to maximize the coal resource recovery rate while avoiding slope instability and structural damage during the mining process.

[0105] According to an embodiment of the present invention, a device for determining mining parameters of end-wall coal is also provided. It should be noted that the device for determining mining parameters of end-wall coal can be used to execute the method for determining mining parameters of end-wall coal in the embodiment.

[0106] Figure 4 Schematic diagram of a device for determining mining parameters of end-to-end coal according to an embodiment of the present invention. Figure 4 As shown, the device 400 for determining the mining parameters of the end coal may include: an acquisition unit 401 , a first determination unit 402 , a second determination unit 403 , a third determination unit 404 and an adjustment unit 405 .

[0107] The acquisition unit 401 is used to acquire a geological exploration report of the end-side coal mining area, wherein the geological exploration report is at least used to characterize the geological conditions of the end-side coal mining area.

[0108] The first determination unit 402 is used to determine the span stability information of the roof of the end-wall coal mining area and the safety factor of the coal pillar in the end-wall coal mining area based on the geological exploration report, wherein the span stability information is used to characterize the maximum span of the roof that maintains stability under unsupported conditions, and the safety factor of the coal pillar is used to characterize the structural stability of the coal pillar when it is subjected to the rock pressure of the roof.

[0109] The second determination unit 403 is used to determine the initial mining parameters for mining the end side coal in the end side coal recovery area based on the span stability information and the safety factor.

[0110] The third determination unit 404 is used to determine the slope stability safety factor of the end wall coal recovery area under the initial mining parameters, wherein the slope stability safety factor is used to at least characterize the performance of the slope in the end wall recovery area in resisting sliding.

[0111] The adjustment unit 405 is used to adjust the initial mining parameters based on the slope stability safety factor to obtain the target mining parameters.

[0112] Optionally, the first determination unit 402 is also used to: extract rock quality indicators, rock strength, joint spacing, joint state and water content of rocks in the end-wall coal mining area from the geological exploration report; determine a first score of rock grade corresponding to the rock quality indicators, a second score corresponding to the rock strength, a third score corresponding to the joint spacing of the rock, a fourth score corresponding to the joint state of the rock and a fifth score corresponding to the water content of the rock; determine an initial score of rock quality based on the first score, the second score, the third score, the fourth score and the fifth score; based on the initial score of rock quality in the end-wall coal mining area, wherein the initial score is used to characterize the rock quality obtained by preliminary evaluation of the rocks in the end-wall coal mining area; based on the relationship between the joint orientation of the rocks in the end-wall coal mining area and the spatial position of the tunnel for mining the end-wall coal, the initial score is corrected to obtain a target score of rock quality; based on the target score, determine the span stability information of the roof of the end-wall coal mining area.

[0113] Optionally, the first determination unit 402 is also used to: divide the rocks in the end coal mining area into different categories based on the target score, wherein the stability, rock cohesion and internal friction angle corresponding to different categories of rocks are different; determine the span stability information of the roof of the end coal mining area based on the stability, rock cohesion and internal friction angle corresponding to different categories of rocks.

[0114] Optionally, the first determination unit 402 is also used to: determine the strength of the coal pillar in the end coal mining area based on the geological exploration report; determine the average stress load of the coal pillar based on the auxiliary area method; determine the safety factor of the coal pillar based on the ratio of the strength of the coal pillar to the average stress load of the coal pillar.

[0115] Optionally, the third determination unit 404 is further used to: perform numerical analysis on the initial mining parameters based on a pre-established end-wall numerical model, and determine the slope stability safety factor of the end-wall coal mining area under the initial mining parameters.

[0116] Optionally, the device 400 for determining the mining parameters of the end-wall coal is also used to mine the end-wall coal in the end-wall coal mining area based on the target mining parameters.

[0117] In this embodiment, by analyzing the geological exploration report, not only the span stability of the roof in the end-side coal mining area is focused on, but also the support stability of the coal pillar and the stability of the slope are evaluated. Based on these key indicators, reasonable mining parameters that can ensure the safety of the mining process and maximize resource recovery can be determined, effectively avoiding dangerous events such as roof collapse, coal pillar instability, and slope sliding that may occur during the mining process, significantly improving the safety of end-side coal mining, and thus solving the technical problem of low safety during end-side coal mining.

[0118] According to an embodiment of the present invention, there is further provided a computer-readable storage medium, the storage medium comprising a stored program, wherein the program executes the method for determining mining parameters of end-wall coal in the embodiment.

[0119] According to an embodiment of the present invention, a processor is further provided, which is used to run a program, wherein when the program is run, the method for determining mining parameters of end-wall coal in the embodiment is executed.

[0120] According to another aspect of the present invention, a computer program product is provided, which includes computer instructions, and when the computer instructions are executed by a processor, the method for determining mining parameters of end-wall coal in the embodiment is implemented.

[0121] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0122] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0123] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0124] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed over multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0125] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0126] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent functional component, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software functional component, which is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, Read-Only Memory (ROM), Random Access Memory (RAM), mobile hard disk, magnetic disk or optical disk, etc., various media that can store program codes.

[0127] The above are only preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for determining mining parameters of end-wall coal, characterized in that: include: Obtaining a geological exploration report of the end-side coal mining area, wherein the geological exploration report is at least used to characterize the geological conditions of the end-side coal mining area; Based on the geological exploration report, respectively determine the span stability information of the roof of the end-wall coal mining area and the safety factor of the coal pillar in the end-wall coal mining area, wherein the span stability information is used to characterize the maximum span of the roof that maintains stability without support, and the safety factor of the coal pillar is used to characterize the structural stability of the coal pillar when subjected to rock pressure from the roof; Based on the span stability information and the safety factor, determining initial mining parameters for mining the end side coal in the end side coal mining area; Determine the slope stability safety factor of the end wall coal recovery area under the initial mining parameters, wherein the slope stability safety factor is used to at least characterize the performance of the slope of the end wall coal recovery area in resisting sliding; Based on the slope stability safety factor, the initial mining parameters are adjusted to obtain target mining parameters.

2. The method according to claim 1, characterized in that Based on the geological exploration report, the span stability information of the roof of the end-wall coal mining area is determined, including: Extracting the rock quality index in the end-wall coal mining area, the rock strength in the end-wall coal mining area, the joint spacing of the rock in the end-wall coal mining area, the joint state of the rock in the end-wall coal mining area, and the water content of the rock in the end-wall coal mining area from the geological exploration report; Determine a first score of rock grade corresponding to the rock quality index, a second score corresponding to the rock strength, a third score corresponding to the joint spacing of the rock, a fourth score corresponding to the joint state of the rock, and a fifth score corresponding to the water content of the rock; determining an initial score of the rock quality based on the first score, the second score, the third score, the fourth score, and the fifth score; An initial score based on the rock quality in the end-wall coal recovery area, wherein the initial score is used to characterize the rock quality obtained by preliminary evaluation of the rock in the end-wall coal recovery area; The initial score is modified based on the relationship between the joint orientation of the rock in the end-wall coal recovery area and the spatial position of the tunnel for mining the end-wall coal to obtain the target score of the rock quality; Based on the target score, the span stability information of the roof of the end-wall coal mining area is determined.

3. The method according to claim 2, characterized in that Based on the target score, determining the span stability information of the roof of the end side coal mining area includes: Based on the target score, the rocks in the end-wall coal recovery area are divided into different categories, wherein the stability, rock mass cohesion and internal friction angle corresponding to different categories of rocks are different; Based on the stability, rock mass cohesion and internal friction angle corresponding to the different types of rocks, the span stability information of the roof of the auxiliary coal mining area is determined.

4. The method according to claim 1, characterized in that Based on the geological exploration report, the safety factor of the coal pillar in the end-wall coal recovery area is determined, including: Based on the geological exploration report, determining the strength of the coal pillars in the end-wall coal recovery area; determining an average stress load of the coal pillar based on an auxiliary area method; The safety factor of the coal pillar is determined based on the ratio of the strength of the coal pillar to the average stress load of the coal pillar.

5. The method according to claim 4, characterized in that The safety factor of the coal pillar includes at least a temporary coal pillar safety factor and a permanent coal pillar safety factor, wherein the temporary coal pillar safety factor is used to characterize the safety of the coal pillar temporarily left in the end side coal mining area during the end side coal mining process when it withstands the rock located above the end side coal mining area, and the permanent coal pillar safety factor is used to characterize the safety of the coal pillar permanently left in the end side coal mining area when it withstands the rock located above the end side coal mining area.

6. The method according to claim 1, characterized in that Determining the slope stability safety factor of the end coal mining area under the initial mining parameters includes: The initial mining parameters are numerically analyzed based on a pre-established end wall numerical model to determine the slope stability safety factor of the end wall coal mining area under the initial mining parameters.

7. The method according to claim 1, characterized in that The method further comprises: The end coal in the end coal mining area is mined based on the target mining parameters.

8. A device for determining mining parameters of end-wall coal, characterized in that: include: An acquisition unit, used for acquiring a geological exploration report of an end-side coal mining area, wherein the geological exploration report is at least used for characterizing the geological conditions of the end-side coal mining area; A first determination unit is used to determine the span stability information of the roof of the end-wall coal mining area and the safety factor of the coal pillar in the end-wall coal mining area based on the geological exploration report, wherein the span stability information is used to characterize the maximum span of the roof to maintain stability under unsupported conditions, and the safety factor of the coal pillar is used to characterize the structural stability of the coal pillar when subjected to rock pressure from the roof; A second determination unit is used to determine initial mining parameters for mining the end side coal in the end side coal mining area based on the span stability information and the safety factor; A third determination unit is used to determine the slope stability safety factor of the end wall coal recovery area under the initial mining parameters, wherein the slope stability safety factor is used to at least characterize the performance of the slope of the end wall recovery area in resisting sliding; The adjustment unit is used to adjust the initial mining parameters based on the slope stability safety factor to obtain target mining parameters.

9. An electronic device, characterized in that: include: A memory storing an executable program; A processor, configured to run the program, wherein the program executes the method according to any one of claims 1 to 7 when running.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein when the program is executed by a processor, the device where the storage medium is located is controlled to execute the method according to any one of claims 1 to 7.

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