Method and device for roof cutting of large depth mining roadway, and computer readable storage medium

Abstract

The application discloses a roof cutting method and device for a large-buried-depth recovery roadway and a computer readable storage medium. The method comprises the following steps: in the process of mining the large-buried-depth recovery roadway, stress monitoring and dynamic load monitoring are performed on the roof to obtain monitoring results; in the case that the monitoring results indicate that the current stress of the roof is higher than a stress threshold value and / or the current dynamic load of the roof is higher than a dynamic load threshold value, a fracture position of the roof at which the roof is fractured is predicted by using a fracture mechanics model based on state parameters of the roof; in the case that the fracture position meets a preset roof cutting condition, a cutting strategy for cutting and removing the roof is generated according to the fracture position; and the roof cutting area in the roof is cut and removed according to the cutting strategy, so that the cut and removed roof reaches a stable state. The application solves the technical problem in the related art that the judgment of whether the roof needs to be cut and removed in the process of coal mining and the operation method for cutting and removing the roof usually depend on manual work, which leads to low accuracy and safety hazards.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coal mine safety, in particular to a roof cutting method and device for a large-buried-depth mining roadway and a computer readable storage medium. BACKGROUND

[0002] At present, many mining areas begin to mine in deep parts. Different from shallow mining, the stress environment of the surrounding rock of a large-buried-depth mining roadway is complex, and the rock burst disaster is prone to occur, which seriously restricts the normal and safe production of the coal mine. In the process of coal mining, roof management is an important link to ensure safe production. The roof of the mining roadway, especially the high weakly-cemented roof of the large-buried-depth mining roadway, has special properties due to the particularity of the environment, such as high stress, high humidity, high temperature, etc., and the stability and safety of the roof directly relate to the efficiency and safety of the coal mine production.

[0003] In the process of advancing the coal mining face, the roof cutting and pressure releasing technology as a common roof treatment method can effectively improve the stress state of the roof and reduce the influence of the roof on the mining roadway. However, in actual application, not all roofs need to be cut and treated. Some roofs have small influence on the mining face due to geological conditions, lithological characteristics and other factors, and do not need to be pressure released. Some roofs have great influence on the mining face due to their special structure and properties, and must be cut and pressure released.

[0004] In the related art, the judgment of whether to cut the roof in the process of coal mining and the operation method of cutting the roof usually rely on manual completion, which leads to low accuracy and safety hazards. At present, no effective solution has been proposed. SUMMARY

[0005] The embodiments of the present application provide a roof cutting method and device for a large-buried-depth mining roadway and a computer readable storage medium to at least solve the technical problem that the judgment of whether to cut the roof in the process of coal mining and the operation method of cutting the roof in the related art usually rely on manual completion, which leads to low accuracy and safety hazards.

[0006] According to an aspect of an embodiment of the present application, there is provided a roof cutting method for a large buried depth recovery roadway, comprising: monitoring stress and dynamic load of a roof of the large buried depth recovery roadway to obtain a monitoring result during mining of the large buried depth recovery roadway, wherein the large buried depth recovery roadway refers to a roadway with a buried depth greater than a depth threshold; in a case where the monitoring result indicates that a current stress of the roof is higher than a stress threshold and / or a current dynamic load of the roof is higher than a dynamic load threshold, predicting a fracture position of the roof at which fracture occurs based on a state parameter of the roof and using a fracture mechanics model, wherein the state parameter represents a current deformation degree of the roof, and the fracture mechanics model refers to a model for analyzing mechanical behavior of fracture of the roof using principles of engineering mechanics; in a case where the fracture position meets a preset roof cutting condition, generating a cutting strategy for cutting treatment of the roof according to the fracture position; and cutting a roof cutting area in the roof according to the cutting strategy, so that the roof after cutting reaches a stable state, wherein the stable state refers to a state in which the current stress of the roof is not higher than the stress threshold and the current dynamic load of the roof is not higher than the dynamic load threshold.

[0007] Optionally, in the case where the monitoring result indicates that the current stress of the roof is higher than the stress threshold and / or the current dynamic load of the roof is higher than the dynamic load threshold, predicting the fracture position of the roof at which fracture occurs based on the state parameter of the roof and using the fracture mechanics model comprises: analyzing a bending moment at each position in the roof based on the state parameter of the roof and using the fracture mechanics model to obtain an analysis result, wherein the bending moment refers to a moment of bending deformation at any position in a rock stratum of the roof; and determining a position at which a maximum bending moment in the roof is located as the fracture position according to the analysis result, wherein the maximum bending moment refers to the moment of bending deformation in the rock stratum of the roof being the maximum value among all the moments.

[0008] Optionally, determining the position at which the maximum bending moment in the roof is located as the fracture position according to the analysis result comprises: calculating the position at which the maximum bending moment in the roof is located using a first formula to obtain the fracture position, wherein the first formula is: x represents a distance between the fracture position and a goaf, β represents a complex part of a general solution in a bending equation, α represents a real part of the general solution in the bending equation, M0 represents the bending moment, Q0 represents a beam shear force, and r and s represent different intermediate parameters, respectively.

[0009] Optionally, before the cutting strategy for cutting the roof is generated according to the fracture position, the roof cutting method of the deep mining roadway further comprises: obtaining a roadway width of the deep mining roadway and a coal pillar width of a coal pillar, wherein the coal pillar refers to a coal pillar in the deep mining roadway for supporting the roof; calculating a sum of the roadway width and the coal pillar width to obtain a width threshold; determining a distance between the fracture position and the goaf as a target distance; in a case where the target distance is zero, obtaining a hanging roof area of a hanging roof in the deep mining roadway, wherein the hanging roof refers to a rock stratum hanging above the goaf in the deep mining roadway; in a case where the hanging roof area is greater than an area threshold, determining that the fracture position meets the preset roof cutting condition; in a case where the target distance is not zero, if the target distance is within an interval range composed of the roadway width and the width threshold, it is determined that the fracture position meets the preset roof cutting condition.

[0010] Optionally, if the target distance is within the interval range, it is determined that the fracture position meets the preset roof cutting condition, including one of: if the target distance is greater than the roadway width and is not greater than the width threshold, the fracture position is above the deep mining roadway, and it is determined that the fracture position meets the preset roof cutting condition; if the target distance is greater than the width threshold, the fracture position is above a coal wall, and it is determined that the fracture position meets the preset roof cutting condition.

[0011] Optionally, in a case where the fracture position meets the preset roof cutting condition, the cutting strategy for cutting the roof is generated according to the fracture position, including: in a case where the fracture position meets the preset roof cutting condition, determining a cutting parameter for cutting the roof according to the fracture position, wherein the cutting parameter comprises: a roof cutting height and a roof cutting angle, the roof cutting height refers to a rock stratum depth to be cut when the roof is cut, and the roof cutting angle refers to an angle at which the rock stratum is cut when the roof is cut; determining the roof cutting height by using a second formula, wherein the second formula is: H Q H represents the roof cutting height, P represents a thickness of the roof, K A represents an average fragmentation coefficient of the rock stratum; determining the roof cutting angle by using a third formula, wherein the third formula is: θ represents the roof cutting angle, L represents a cantilever beam length, h g represents a height of the goaf; and taking a strategy of cutting the roof according to the roof cutting angle and the roof cutting height as the cutting strategy.

[0012] Optionally, the roof cutting method of the large depth mining roadway further comprises: in a case where the target distance is zero and the hanging roof area is not greater than an area threshold, determining that the fracture position does not meet the preset roof cutting condition, wherein the target distance is a distance between the fracture position and the goaf, and the hanging roof area is an area of a hanging roof in the large depth mining roadway; in a case where the target distance is greater than zero and not greater than a roadway width of the large depth mining roadway, determining that the fracture position does not meet the preset roof cutting condition; in a case where the fracture position does not meet the preset roof cutting condition, continuously monitoring stress and dynamic load of the roof to obtain a target monitoring result; and in a case where it is determined according to the target monitoring result that the roof needs to be cut, cutting the roof according to a target cutting strategy, wherein the target cutting strategy is a strategy generated based on the current fracture position of the roof.

[0013] According to another aspect of the embodiment of the present application, a roof cutting device of a large depth mining roadway is further provided, comprising: a monitoring unit configured to monitor stress and dynamic load of a roof of the large depth mining roadway to obtain a monitoring result during mining of the large depth mining roadway, wherein the large depth mining roadway refers to a roadway with a buried depth greater than a depth threshold; a prediction unit configured to, in a case where the monitoring result indicates that current stress of the roof is higher than a stress threshold and / or current dynamic load of the roof is higher than a dynamic load threshold, predict a fracture position of the roof at which the roof breaks based on a state parameter of the roof and a breakage mechanics model, wherein the state parameter represents a current deformation degree of the roof, and the breakage mechanics model refers to a model for analyzing mechanical behavior of breakage of the roof by using principles of engineering mechanics; a generation unit configured to, in a case where the fracture position meets a preset roof cutting condition, generate a cutting strategy for cutting the roof according to the fracture position; and a first cutting unit configured to cut a roof cutting area in the roof according to the cutting strategy, so that the roof after cutting reaches a stable state, wherein the stable state refers to a state in which the current stress of the roof is not higher than the stress threshold and the current dynamic load of the roof is not higher than the dynamic load threshold.

[0014] Optionally, the prediction unit comprises: an acquisition module configured to analyze a bending moment at each position in the roof based on a state parameter of the roof and the breakage mechanics model to obtain an analysis result, wherein the bending moment refers to a moment of bending deformation at any position in a rock stratum of the roof; and a determination module configured to determine a position at which a maximum bending moment in the roof is located as the fracture position according to the analysis result, wherein the maximum bending moment refers to a maximum value of the moment of bending deformation in the rock stratum of the roof.

[0015] Optionally, the determining module comprises: an obtaining submodule for calculating the position of the maximum bending moment in the roof by using a first formula to obtain the fracture position, wherein the first formula is: x represents the distance between the fracture position and the goaf, β represents the complex part of the general solution of the bending equation, α represents the real part of the general solution of the bending equation, M0 represents the bending moment, Q0 represents the beam shear force, and r and s represent different intermediate parameters.

[0016] Optionally, the roof cutting device of the large-depth mining roadway further comprises: a first obtaining unit, configured to obtain a roadway width of the large-depth mining roadway and a coal pillar width of a coal pillar before generating a cutting strategy for cutting the roof according to the fracture position, wherein the coal pillar refers to a coal pillar in the large-depth mining roadway for supporting the roof; a calculation unit, configured to calculate a sum of the roadway width and the coal pillar width to obtain a width threshold; a first determination unit, configured to determine a distance between the fracture position and the goaf as a target distance; a second obtaining unit, configured to obtain a hanging roof area of a hanging roof in the large-depth mining roadway in a case where the target distance is zero, wherein the hanging roof refers to a rock stratum hanging above the goaf in the large-depth mining roadway; a second determination unit, configured to determine that the fracture position meets the preset roof cutting condition in a case where the hanging roof area is greater than an area threshold; and a third determination unit, configured to determine that the fracture position meets the preset roof cutting condition in a case where the target distance is not zero and the target distance is within an interval range composed of the roadway width and the width threshold.

[0017] Optionally, the third determination unit comprises one of the following: a first determination module, configured to determine that the fracture position meets the preset roof cutting condition in a case where the target distance is greater than the roadway width and not greater than the width threshold, and the fracture position is above the large-depth mining roadway; and a second determination module, configured to determine that the fracture position meets the preset roof cutting condition in a case where the target distance is greater than the width threshold, and the fracture position is above a coal wall.

[0018] Optionally, the generation unit comprises: a third determination module, configured to determine a cutting parameter for cutting the roof according to the fracture position in a case where the fracture position meets the preset roof cutting condition, wherein the cutting parameter comprises a roof cutting height and a roof cutting angle, the roof cutting height refers to a rock stratum depth to be cut in the cutting of the roof, and the roof cutting angle refers to an angle at which the rock stratum is cut in the cutting of the roof; and a fourth determination module, configured to determine the roof cutting height by using a second formula, wherein the second formula is: HQ represents the height of the roof cutting, P represents the thickness of the roof, K A represents the average broken expansion coefficient of the rock stratum; the fifth determining module is configured to determine the roof cutting angle by using a third formula, wherein the third formula is: represents the roof cutting angle, L represents the length of the cantilever beam, h g represents the height of the goaf; the sixth determining module is configured to determine the strategy of cutting the roof according to the roof cutting angle and the roof cutting height as the cutting strategy.

[0019] Optionally, the roof cutting device of the large-depth mining roadway further includes: a fourth determining unit, configured to determine that the fracture position does not meet the preset roof cutting condition in a case where a target distance is zero and a roof suspension area is not greater than an area threshold, wherein the target distance is a distance between the fracture position and the goaf, and the roof suspension area is an area of the roof suspension in the large-depth mining roadway; a fifth determining unit, configured to determine that the fracture position does not meet the preset roof cutting condition in a case where the target distance is greater than zero and not greater than a roadway width of the large-depth mining roadway; a third obtaining unit, configured to continue stress monitoring and dynamic load monitoring on the roof in a case where the fracture position does not meet the preset roof cutting condition, to obtain a target monitoring result; and a second cutting unit, configured to perform cutting processing on the roof according to a target cutting strategy in a case where it is determined according to the target monitoring result that the cutting processing on the roof is needed, wherein the target cutting strategy is a strategy generated based on the current fracture position of the roof.

[0020] According to another aspect of the embodiments of the present application, a roof cutting system of a large-depth mining roadway is also provided, which uses any of the roof cutting methods of the large-depth mining roadway described above.

[0021] According to another aspect of the embodiments of the present application, a computer readable storage medium is also provided, which includes a stored program, wherein the program executes any of the roof cutting methods of the large-depth mining roadway described above.

[0022] According to another aspect of the embodiments of the present application, a processor is also provided, which is used to run a program, wherein the program executes any of the roof cutting methods of the large-depth mining roadway described above when running.

[0023] According to another aspect of the embodiments of the present application, a computer program product is also provided, which includes computer instructions, wherein the computer instructions are executed by a processor to execute any of the roof cutting methods of the large-depth mining roadway described above.

[0024] In the embodiment of the present application, in the process of mining the large-buried-depth mining roadway, the stress of the roof of the large-buried-depth mining roadway is monitored and the dynamic load is monitored to obtain a monitoring result, wherein the large-buried-depth mining roadway refers to a roadway with a buried depth greater than a depth threshold; in the case that the monitoring result indicates that the current stress of the roof is higher than a stress threshold and / or the current dynamic load of the roof is higher than a dynamic load threshold, a breaking mechanics model is used to predict a breaking position of the roof breaking based on a state parameter of the roof, wherein the state parameter represents the current deformation degree of the roof, and the breaking mechanics model refers to a model for analyzing the mechanical behavior of the roof breaking by using the principle of engineering mechanics; in the case that the breaking position meets a preset roof cutting condition, a cutting strategy for cutting the roof is generated according to the breaking position; and the roof cutting area in the roof is cut according to the cutting strategy, so that the cut roof reaches a stable state, wherein the stable state refers to a state in which the current stress of the roof is not higher than the stress threshold and the current dynamic load of the roof is not higher than the dynamic load threshold. Through the above technical scheme, the purpose of monitoring the roof of the large-buried-depth mining roadway to predict the position of possible breaking according to the deformation degree of the roof and analyze whether the roof needs to be cut to avoid potential safety hazards in the large-buried-depth mining roadway is achieved, the technical effect of intelligently analyzing the breaking position of the roof in the large-buried-depth mining roadway and intelligently analyzing and determining the relevant roof cutting parameters when the roof needs to be cut is achieved, the accuracy of judgment and decision on the roof cutting is improved, and the technical problem that the judgment on whether the roof needs to be cut and the operation method of cutting the roof in the process of coal mining are usually completed by manual work, resulting in low accuracy and safety hazards is solved. BRIEF DESCRIPTION OF DRAWINGS

[0025] The accompanying drawings, which are included to provide a further understanding of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and serve to explain the present application. In the drawings:

[0026] Figure 1 is a hardware structure block diagram of a mobile terminal of a roof cutting method of a large-buried-depth mining roadway according to an embodiment of the present application;

[0027] Figure 2 is a flowchart of a roof cutting method of a large-buried-depth mining roadway according to an embodiment of the present application;

[0028] Figure 3 is a flowchart of an optional roof cutting method of a large-buried-depth mining roadway according to an embodiment of the present application;

[0029] Figure 4 is a schematic diagram of a large-buried-depth mining roadway according to an embodiment of the present application;

[0030] Figure 5 is a schematic diagram of a deformation curve parameter of a basic roof according to an embodiment of the present application;

[0031] Figure 6 is a schematic diagram of a large-buried depth recovery roadway according to an embodiment of the present application;

[0032] Figure 7 is a schematic diagram of a roof cutting device of a large-buried depth recovery roadway according to an embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to make the personnel in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor should belong to the scope of protection of the present application.

[0034] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are used to distinguish similar objects, and do not necessarily have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to only those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0035] As introduced in the background, the judgment of whether to perform roof cutting in the coal mining process and the operation method of roof cutting in the related art are usually completed by artificial, which leads to low accuracy and safety hazards. In view of the above defects, a roof cutting method and device for a large-buried depth recovery roadway, and a computer readable storage medium are provided in the embodiments of the present application.

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application.

[0037] The method embodiments provided in the embodiments of the present application can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking the case of running on a mobile terminal, Figure 1 is a hardware structure block diagram of a mobile terminal of a roof cutting method for a large-buried depth recovery roadway according to an embodiment of the present application. As Figure 1 shown, the mobile terminal can include one or more Figure 1The mobile terminal can further include a transmission device 106 for communication function and an input / output device 108. Those skilled in the art can understand that, Figure 1 The structure shown is only schematic, and does not limit the structure of the mobile terminal. For example, the mobile terminal can include more or less components than those shown, or have a different configuration or arrangement of the components. Figure 1 The mobile terminal can include more or less components than those shown, or have a different configuration or arrangement of the components. Figure 1 The mobile terminal can include more or less components than those shown, or have a different configuration or arrangement of the components.

[0038] The memory 104 can be used to store computer programs, such as software programs and modules of application software, and a computer program corresponding to the roof cutting method for large buried depth mining roadway in the embodiments of the present application. The processor 102 can execute various function applications and data processing by running the computer program stored in the memory 104, i.e. implement the method described above. The memory 104 can include a high-speed random access memory, and can further include a non-volatile memory, such as one or more magnetic storage devices, flash memories, or other non-volatile solid-state memories. In some examples, the memory 104 can further include a memory remotely arranged with respect to the processor 102, and the remote memory can be connected to the mobile terminal through a network. Examples of the network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof. The transmission device 106 is used to receive or send data via a network. The specific examples of the network can include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (RF) module, which is used to communicate with the Internet in a wireless manner.

[0039] According to the embodiments of the present application, a method embodiment of the roof cutting method for large buried depth mining roadway 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 group of computer executable instructions, and although the 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.

[0040] Figure 2 is a flowchart of the roof cutting method for large buried depth mining roadway according to the embodiments of the present application, as Figure 2 shown, the method includes the following steps:

[0041] Step S202: During the mining process of the deep-buried mining roadway, stress monitoring and dynamic load monitoring are carried out on the roof of the deep-buried mining roadway to obtain the monitoring results. The deep-buried mining roadway refers to the roadway with a burial depth greater than the depth threshold.

[0042] In this embodiment, during the mining of deep-buried roadways, stress and dynamic load monitoring can be performed using anchor bolt / cable force gauges, roof separation meters, laser rangefinders, and borehole stress gauges to analyze the roof condition based on the monitoring results. Furthermore, the layout of monitoring stations should fully consider the influence of geological structures, surrounding rock properties, and coal pillar dimensions. For the working face roadway, monitoring should be conducted outside a 200m advance range (this value can be adaptively adjusted based on actual conditions without specific limitations) to avoid interference from working face mining on initial stress monitoring and to determine whether the roof experiences high stress or high dynamic load.

[0043] Step S204: If the monitoring results indicate that the current stress of the top plate is higher than the stress threshold and / or the current dynamic load of the top plate is higher than the dynamic load threshold, the fracture location of the top plate is predicted by using the fracture mechanics model based on the state parameters of the top plate. Here, the state parameters represent the current deformation degree of the top plate, and the fracture mechanics model refers to the model that analyzes the mechanical behavior of the top plate fracture using the principles of engineering mechanics.

[0044] The following is combined Figure 3 The embodiments of the present invention will be described in detail below. Figure 3 This is a flowchart of an optional roof-cutting method for deep-buried mining roadways according to an embodiment of the present invention, such as... Figure 3 As shown, when the monitoring results indicate that the top plate is currently under high stress (i.e., the current stress of the top plate is higher than the stress threshold) and high dynamic load (i.e., the current dynamic load of the top plate is higher than the dynamic load threshold), an "OX" type fracture mechanical model of the top plate can be established. The exact location of the top plate fracture under the ultimate span (i.e., the fracture location in the embodiment of the present invention) can be calculated through theoretical analysis, revealing its fracture mechanism and spatial morphology.

[0045] Optionally, if the monitoring results indicate that the current stress of the roof is higher than the stress threshold and / or the current dynamic load of the roof is higher than the dynamic load threshold, the fracture location of the roof fracture is predicted using a fracture mechanics model based on the roof's state parameters. This includes: analyzing the bending moment at each location in the roof using the fracture mechanics model based on the roof's state parameters to obtain analysis results, where the bending moment refers to the moment that causes bending deformation at any location in the rock strata of the roof; and determining the location of the maximum bending moment in the roof as the fracture location based on the analysis results, where the maximum bending moment refers to the maximum value among all moments that cause bending deformation in the rock strata of the roof.

[0046] The above-mentioned embodiments of the present application are described in detail below, Figure 4 and Figure 5 The above-mentioned embodiments of the present application are described in detail below, Figure 4 is a schematic view of a large-depth mining roadway according to an embodiment of the present application, Figure 5 is a schematic view of a basic roof deformation curve parameter according to an embodiment of the present application.

[0047] As Figure 4As shown, one or several layers of basic roof rock in front of the mining face can be considered as a plane strain beam sandwiched in the strike direction by softer rock layers above and below, with the length of the beam considered infinite in the direction of face advance and supported by fractured rock in the direction of the goaf. The labels of key block A, key block B, and key block C are generally related to the breaking and caving mechanism of the roof rock, and they respectively represent rock blocks in different states, as follows: 1) Key block A: generally refers to the rock block above the mining roadway that has not yet broken or has not completely broken. After the goaf is formed, key block A may be in a hanging roof state due to stress redistribution, i.e., part or all of the rock hangs above the roadway without immediate caving, but forms a potentially unstable rock structure. The presence of key block A poses a threat to the stability of the roadway, as it may suddenly collapse under external loads (such as subsequent mining, vibration, etc.), causing damage to the roadway and personnel and equipment; 2) Key block B: refers to a rock block that has broken and partially caved, usually above the goaf. During mining, key block B may form above the goaf due to coal mining and stress release in the overlying rock, and it has already separated from key block A, but in some cases it may still be connected to part of the overlying rock or form a so-called "bridge" structure. The dynamic behavior of key block B, such as its caving process and caving range, directly affects the formation of the goaf and the stability of the overlying rock, and has an important influence on the safety of subsequent roadways and roof management; 3) Key block C: may refer to the rock block above key block A, or another part of the rock related to blocks A and B. In some cases, key block C can represent the upper rock, which may generate additional stress or deformation under the influence of mining, thereby affecting the stability of the lower rock (such as key block A and key block B). The presence and state of key block C is one of the important factors in assessing whether high roof needs to be cut and treated, as the stability of the high rock will be transmitted to the lower rock, affecting the roof management of the mining roadway. By identifying and analyzing the mechanical behavior and stability of key blocks A, B, and C, scientific basis can be provided for the roof management of coal mines, for example, if key block A is in a hanging roof state and poses a threat to the stability of the mining roadway, cutting and pressure relief measures may need to be taken to reduce the risk of its collapse. At the same time, the state of key block B (such as whether an effective caving zone is formed) can be used to evaluate the effectiveness of cutting and pressure relief measures, and the stability of key block C can help predict the long-term stability of the high roof and whether additional roof management measures need to be taken.

[0048] In addition, as Figure 5 shown, a certain thickness of medium above and below the basic roof can be considered as an elastic medium, and it is considered to approximately satisfy the Winkler elastic foundation assumption. Through analysis of the disturbance caused in the basic roof when the basic roof breaks, the deformation curve equation of the basic roof is as follows: In the formula, r and s have no practical meaning; they are intermediate parameters established for ease of calculation. β represents the complex part of the general solution in the bending equation, and α represents the real part of the general solution in the bending equation. E and I are the elastic modulus and section moment of the basic top rock layer, respectively, and I = bh. 3 / 12, k is the cushion layer coefficient of the coal body below the basic top. For simplicity, it is assumed to be M0 = (R S +N / bh1)bh1 2 The calculation is performed using / 6, where Q0 = qL′ + Q′, and Q′ = L(h1γ + q). M0 represents the beam bending moment corresponding to the location of the coal face at the working face, Q0 represents the beam shear force corresponding to the location of the coal face at the working face, and R... S γ is the tensile strength of the basic roof stratum, N is the axial force of the beam corresponding to the position of the coal face in the working face, L is the length of the fractured rock block, L′ is the length of the overhang of the fractured rock block, h1 is the thickness of the basic roof stratum, h2 is the thickness of the overlying stratum of the basic roof, Q′ is the self-weight of the fractured rock block and its load, γ is the unit weight of the basic roof stratum, ΔS is the difference in vertical displacement between the two ends of the fractured rock block, and q is the load intensity of the fractured rock block.

[0049] In the above embodiments of the present invention, determining the location of the maximum bending moment in the top plate as the fracture location based on the analysis results includes: calculating the location of the maximum bending moment in the top plate using a first formula to obtain the fracture location, wherein the first formula is: x represents the distance between the fracture location and the goaf, β represents the complex part of the general solution in the bending equation, α represents the real part of the general solution in the bending equation, M0 represents the bending moment, Q0 represents the beam shear force, and r and s represent different intermediate parameters.

[0050] Specifically, the fracture location of the main roof can be calculated based on the location of the maximum bending moment M. The formula for calculating the location of the maximum bending moment is as follows: x represents the distance between the fracture location and the goaf.

[0051] Step S206: If the fracture location meets the preset top cutting conditions, generate a cutting strategy for cutting the top plate based on the fracture location.

[0052] In this embodiment, it can be determined whether the top plate needs to be removed by judging which specific area the fracture location is in, that is, by judging whether the area where the fracture location is located meets the preset top-cutting conditions that require the top plate to be removed. If the judgment result indicates that the fracture location meets the preset top-cutting conditions, a cutting strategy for removing the top plate is generated based on the fracture location.

[0053] According to the above embodiment of the present application, before the cutting strategy is generated in step S206, it is further needed to judge whether the fracture position meets the preset cutting top condition, that is, before the cutting strategy for cutting the top of the roof is generated according to the fracture position, the cutting top method of the deep mining roadway further comprises: obtaining a roadway width of the deep mining roadway and a coal pillar width of the set coal pillar, wherein the set coal pillar refers to the coal pillar in the deep mining roadway for supporting the roof; calculating the sum of the roadway width and the coal pillar width to obtain a width threshold; determining the distance between the fracture position and the goaf as a target distance; in the case that the target distance is zero, obtaining a hanging roof area of the deep mining roadway, wherein the hanging roof refers to the rock stratum hanging above the goaf in the deep mining roadway; in the case that the hanging roof area is greater than an area threshold, determining that the fracture position meets the preset cutting top condition; in the case that the target distance is not zero, if the target distance is in an interval range composed of the roadway width and the width threshold, it is determined that the fracture position meets the preset cutting top condition.

[0054] The above Figure 6 The above Figure 6 is a schematic diagram of the deep mining roadway according to an embodiment of the present application.

[0055] As described above Figure 3 , the above Figure 4 and Figure 6 , when x0=0, the fracture position of the roof (i.e. the fracture position) is above the goaf, where x0 and x both represent the distance between the fracture position of the roof and the goaf, and when the distance is zero, it is represented by x0. When x0=0, the fracture line of the basic roof is in the goaf, the basic roof of the roadway is disconnected with the basic roof of the goaf, the disturbance degree of the goaf rock stratum activity to the overburden structure of the roadway is the smallest, the deformation amount of the roadway surrounding rock is the smallest, and the roof can naturally collapse; however, if the key block A is hard and complete and has a hanging roof at a distance from the goaf, and the key block B is fractured in the goaf, at this time, the pressure of the high position rock stratum on the basic roof is transmitted to the coal pillar above by the basic roof, the bearing capacity of the coal pillar is too large, and the roof needs to be cut off, that is, it is needed to judge whether the hanging roof area above the goaf exceeds a predetermined area threshold, and if it exceeds, the roof needs to be cut off, and if it does not exceed, the roof can naturally collapse.

[0056] In the case that the distance between the fracture position of the roof and the goaf is not zero, the interval range in which the distance is located can be used to determine the area where the fracture position is located, so as to judge whether the fracture position meets the preset cutting top condition.

[0057] In the above embodiment of the present application, if the target distance is within the interval range, it is determined that the fracture position meets the preset top cutting condition, including one of the following: if the target distance is greater than the roadway width and not greater than the width threshold value, the fracture position is above the large depth mining roadway, and it is determined that the fracture position meets the preset top cutting condition; if the target distance is greater than the width threshold value, the fracture position is above the coal side, and it is determined that the fracture position meets the preset top cutting condition.

[0058] Specifically, as shown above Figure 3 When 0 < x < b, the basic roof fracture line (also referred to as the fracture position) is above the coal pillar, which disturbs the coal pillar and causes stress concentration, the deformation of the surrounding rock of the coal pillar on the goaf side increases, the solid coal side is relatively stable, the deformation of the surrounding rock of the roadway is small, and the roof naturally collapses; when b < x < a + b, the basic roof fracture line is above the roadway, the coal pillar is most seriously unstable and damaged under the influence of the superposition of the dynamic and static loads, the deformation of the surrounding rock of the roadway is the largest, a large range of tensile damage occurs in the surrounding rock of the roadway, and the roof needs to be cut; when x > a + b, the basic roof fracture position is above the solid coal side, the basic roof will inevitably fracture again on the goaf side, the overlying strata form a "reverse step" shape, the load of the coal pillar increases, the deformation of the roadway is large, and the roof needs to be cut; in general, when the distance x is greater than the width b of the mining roadway, it can be considered that the fracture position meets the preset top cutting condition, and a corresponding top cutting strategy needs to be generated.

[0059] According to the above embodiment of the present application, in the step S206, in the case that the fracture position meets the preset top cutting condition, a cutting strategy for cutting the roof is generated according to the fracture position, including: in the case that the fracture position meets the preset top cutting condition, cutting parameters for cutting the roof are determined according to the fracture position, wherein the cutting parameters include: a top cutting height and a top cutting angle, the top cutting height refers to the depth of the rock layer that needs to be cut when the roof is cut, and the top cutting angle refers to the angle at which the rock layer is cut when the roof is cut; the top cutting height is determined by using a second formula, wherein the second formula is: H Q represents the top cutting height, P represents the thickness of the roof, K A represents the average broken expansion coefficient of the rock layer; the top cutting angle is determined by using a third formula, wherein the third formula is: represents the top cutting angle, L represents the length of the cantilever beam, h g represents the height of the goaf; the strategy for cutting the roof according to the top cutting angle and the top cutting height is taken as the cutting strategy.

[0060] Specifically, for the roof region determined to implement the cutting top treatment, scientific cutting top technical means are adopted for intervention treatment, the roof structure is optimized, and the stability and safety of the roadway are enhanced. When determining the cutting strategy for cutting the roof according to the fracture position of the roof, the following aspects are mainly considered: 1) cutting top pressure relief opportunity: in the roadway of the upper section working face, at the position of the roof, the roadway roof is pre-cut at a predetermined angle, drilling holes are arranged in advance, the roof cantilever structure is cut off, the rock stratum is cut off at the pre-split surface, and when the working face is pushed through, the roof periodic pressure and the weight of the roof are applied to the roadway roof, and the roadway roof is cut along the pre-cut joint surface and falls into the goaf; 2) cutting top height design: under the condition of a composite roof, when the cutting top height is not greater than the sum of the thickness of the immediate roof and the basic roof, the actual selected blasting cutting top height should be the sum of the thickness of the immediate roof and the basic roof; and when the cutting top height is not less than the sum of the thickness of the immediate roof and the basic roof, the actual selected blasting cutting top height should be the calculated cutting top height; the cutting top height calculation formula can be represented as: H Q represents the cutting top height, P represents the thickness of the roof, K A represents the average rock burst coefficient of the rock stratum; 3) cutting top angle design: generally, the cutting top borehole and the vertical line of the roof maintain a small angle, so as to ensure the effect of cutting the top, and the cutting top angle (the angle between the cutting top borehole and the vertical line of the roof) calculation formula can be represented as: θ represents the cutting top angle, L represents the cantilever beam length, h g represents the height of the goaf; the cutting strategy of cutting the roof according to the above-mentioned opportunity, cutting top angle and cutting top height can be used as the cutting strategy.

[0061] In step S208, the cutting top region in the roof is cut according to the cutting strategy, so that the cut roof reaches a stable state, wherein the stable state refers to a state in which the current stress of the roof is not higher than the stress threshold and the current dynamic load is not higher than the dynamic load threshold.

[0062] In this embodiment, after obtaining the cutting top strategy for cutting the roof according to the above-mentioned steps, the roof can be cut according to the cutting top strategy, so that the cut roof reaches a stable state, i.e., the current stress of the roof is not higher than the stress threshold and the current dynamic load is not higher than the dynamic load threshold, thereby ensuring the safety of the large-buried-depth recovery roadway.

[0063] In an optional embodiment of the present application, the roof cutting method of the large depth mining roadway further comprises: determining that the fracture position does not meet the preset roof cutting condition when the target distance is zero and the suspended roof area is not greater than the area threshold, wherein the target distance is the distance between the fracture position and the goaf, and the suspended roof area is the area of the suspended roof in the large depth mining roadway; determining that the fracture position does not meet the preset roof cutting condition when the target distance is greater than zero and not greater than the roadway width of the large depth mining roadway; continuing to monitor the stress and dynamic load of the roof to obtain a target monitoring result when the fracture position does not meet the preset roof cutting condition; and cutting the roof according to a target cutting strategy when it is determined according to the target monitoring result that the roof needs to be cut, wherein the target cutting strategy is a strategy generated based on the current fracture position of the roof.

[0064] Specifically, when it is determined according to the judgment in the above steps that the fracture position of the roof does not meet the preset roof cutting condition, that is, x0=0 and the suspended roof area above the goaf does not exceed the area threshold, or 0

[0065] From the above, through the technical scheme provided by the above embodiments of the application, the stress of the roof of the large-buried-depth recovery roadway can be monitored and the dynamic load of the roof of the large-buried-depth recovery roadway can be monitored in the process of mining the large-buried-depth recovery roadway, and the monitoring result is obtained, wherein the large-buried-depth recovery roadway refers to a roadway with a buried depth greater than a depth threshold; in the case that the monitoring result indicates that the current stress of the roof is higher than a stress threshold and / or the current dynamic load of the roof is higher than a dynamic load threshold, the fracture position of the roof at which fracture occurs is predicted based on the state parameter of the roof by using a fracture mechanics model, wherein the state parameter represents the current deformation degree of the roof, and the fracture mechanics model refers to a model for analyzing the mechanical behavior of the fracture of the roof by using the principle of engineering mechanics; in the case that the fracture position meets a preset roof-cutting condition, a cutting strategy for cutting the roof is generated according to the fracture position; and the roof-cutting area in the roof is cut according to the cutting strategy, so that the cut roof reaches a stable state, wherein the stable state refers to a state in which the current stress of the roof is not higher than the stress threshold and the current dynamic load of the roof is not higher than the dynamic load threshold, thereby achieving the purpose of monitoring the roof of the large-buried-depth recovery roadway, predicting the position at which fracture is likely to occur according to the deformation degree of the roof, and analyzing whether roof cutting is needed to avoid potential safety hazards in the large-buried-depth recovery roadway, and realizing the technical effect of intelligently analyzing the fracture position of the roof in the large-buried-depth recovery roadway and intelligently analyzing and determining relevant roof-cutting parameters when roof cutting is needed, thereby improving the accuracy of judgment and decision-making for roof cutting.

[0066] Therefore, through the technical scheme provided by the above embodiments of the application, the technical problem that the judgment of whether roof cutting is needed in the process of coal mining and the operation method of roof cutting are usually completed manually in the related art, resulting in low accuracy and safety hazards is solved.

[0067] It should be noted that, for each method embodiment described above, in order to simply describe, each method embodiment is described as a series of action combinations, but those skilled in the art should know that the present application is not limited by the order of the actions described, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should know that the embodiments described in the specification all belong to preferred embodiments, and the actions and modules involved are not necessarily necessary for the present application.

[0068] Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be realized by means of software on a general hardware platform as necessary, and of course can also be realized by hardware, but in many cases the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product, which is stored in a storage medium (such as a ROM / RAM, a magnetic disk, or an optical disk) and includes a number of instructions for causing a terminal device (which can be a mobile phone, a computer, a server, or a network device) to perform the methods described in the various embodiments of the present application.

[0069] According to the embodiments of the present application, a roof cutting device for a large-depth mining roadway is also provided, Figure 7 is a schematic diagram of the roof cutting device for a large-depth mining roadway according to the embodiments of the present application, as Figure 7 shown, the device includes a monitoring unit 71, a prediction unit 73, a generation unit 75, and a first cutting unit 77. The roof cutting device for a large-depth mining roadway will be described in detail below.

[0070] The monitoring unit 71 is configured to monitor the stress and dynamic load of the roof of the large-depth mining roadway during mining of the large-depth mining roadway, and obtain a monitoring result, wherein the large-depth mining roadway refers to a roadway with a depth greater than a depth threshold.

[0071] The prediction unit 73 is configured to, in a case where the monitoring result indicates that the current stress of the roof is higher than a stress threshold and / or the current dynamic load of the roof is higher than a dynamic load threshold, predict a fracture position of a fracture of the roof based on a state parameter of the roof using a fracture mechanics model, wherein the state parameter represents a current deformation degree of the roof, and the fracture mechanics model refers to a model for analyzing the mechanical behavior of the fracture of the roof using principles of engineering mechanics.

[0072] The generation unit 75 is configured to, in a case where the fracture position meets a preset roof cutting condition, generate a cutting strategy for cutting the roof according to the fracture position.

[0073] The first cutting unit 77 is configured to cut a roof cutting area in the roof according to the cutting strategy, so that the cut roof reaches a stable state, wherein the stable state refers to a state in which the current stress of the roof is not higher than the stress threshold and the current dynamic load of the roof is not higher than the dynamic load threshold.

[0074] It should be noted that the above monitoring unit 71, prediction unit 73, generation unit 75, and first cutting unit 77 correspond to steps S202 to S208 in the above embodiments, and the four units have the same instances and application scenarios as the corresponding steps, but are not limited to the contents disclosed in the above embodiments.

[0075] As can be seen from the above, in the scheme described in the above embodiments of the present application, the stress monitoring and dynamic load monitoring of the roof of the large-buried-depth mining roadway can be performed by using the monitoring unit during the mining of the large-buried-depth mining roadway, and the monitoring result is obtained, wherein the large-buried-depth mining roadway refers to a roadway with a buried depth greater than a depth threshold; then, in the case that the monitoring result indicates that the current stress of the roof is higher than a stress threshold and / or the current dynamic load of the roof is higher than a dynamic load threshold, the fracture position of the fracture of the roof is predicted based on the state parameter of the roof by using the prediction unit and a fracture mechanics model, wherein the state parameter represents the current deformation degree of the roof, and the fracture mechanics model refers to a model for analyzing the mechanical behavior of the fracture of the roof by using the principles of engineering mechanics; then, in the case that the fracture position meets a preset roof cutting condition, the cutting strategy for cutting the roof is generated according to the fracture position by using the generation unit; finally, the cutting of the roof cutting area in the roof is performed according to the cutting strategy by using the first cutting unit, so that the cut roof reaches a stable state, wherein the stable state refers to a state in which the current stress of the roof is not higher than the stress threshold and the current dynamic load of the roof is not higher than the dynamic load threshold, thereby achieving the purpose of monitoring the roof of the large-buried-depth mining roadway, predicting the position of the fracture according to the deformation degree of the roof, and analyzing whether the roof cutting is needed to avoid potential safety hazards in the large-buried-depth mining roadway, and realizing the technical effect of intelligently analyzing the fracture position of the roof in the large-buried-depth mining roadway and intelligently analyzing and determining the relevant roof cutting parameters when the roof cutting is needed, thereby improving the accuracy of the judgment and decision of the roof cutting.

[0076] Therefore, by the technical scheme provided in the above embodiments of the present application, the technical problem that the judgment of whether the roof cutting is needed during the coal mining process and the operation method of the roof cutting are usually completed by manual work, resulting in low accuracy and safety hazards in the related art is solved.

[0077] In an optional embodiment, the prediction unit comprises: an acquisition module configured to analyze the bending moment at each position in the roof by using the fracture mechanics model based on the state parameter of the roof, and obtain an analysis result, wherein the bending moment refers to the moment of bending deformation at any position in the rock stratum of the roof; and a determination module configured to determine the position of the maximum bending moment in the roof as the fracture position according to the analysis result, wherein the maximum bending moment refers to the maximum value of the moments of bending deformation in the rock stratum of the roof.

[0078] In an optional embodiment, the determination module comprises: an acquisition sub-module configured to calculate the position of the maximum bending moment in the roof by using a first formula, and obtain the fracture position, wherein the first formula is: x represents the distance between the fracture position and the goaf, β represents the complex part of the general solution of the bending equation, a represents the real part of the general solution of the bending equation, M0 represents the bending moment, Q0 represents the beam shear force, and r and s represent different intermediate parameters.

[0079] In an optional embodiment, the roof cutting device of the deep mining roadway further comprises: a first obtaining unit, configured to obtain a roadway width of the deep mining roadway and a coal pillar width of a coal pillar before generating a cutting strategy for cutting the roof according to the fracture position, wherein the coal pillar refers to a coal pillar in the deep mining roadway for supporting the roof; a calculation unit, configured to calculate a sum of the roadway width and the coal pillar width to obtain a width threshold; a first determination unit, configured to determine a distance between the fracture position and the goaf as a target distance; a second obtaining unit, configured to obtain a hanging roof area of a hanging roof in the deep mining roadway in a case where the target distance is zero, wherein the hanging roof refers to a rock stratum hanging above the goaf in the deep mining roadway; a second determination unit, configured to determine that the fracture position meets a preset roof cutting condition in a case where the hanging roof area is greater than an area threshold; and a third determination unit, configured to determine that the fracture position meets the preset roof cutting condition in a case where the target distance is not zero and the target distance is within an interval range, wherein the interval range is a range composed of the roadway width and the width threshold.

[0080] In an optional embodiment, the third determination unit comprises one of: a first determination module, configured to determine that the fracture position meets the preset roof cutting condition in a case where the target distance is greater than the roadway width and is not greater than the width threshold, and the fracture position is above the deep mining roadway; and a second determination module, configured to determine that the fracture position meets the preset roof cutting condition in a case where the target distance is greater than the width threshold, and the fracture position is above a coal wall.

[0081] In an optional embodiment, the generation unit comprises: a third determination module, configured to determine a cutting parameter for cutting the roof according to the fracture position in a case where the fracture position meets the preset roof cutting condition, wherein the cutting parameter comprises a cutting height and a cutting angle, the cutting height refers to a rock stratum depth to be cut in the cutting of the roof, and the cutting angle refers to an angle at which the rock stratum is cut in the cutting of the roof; a fourth determination module, configured to determine the cutting height by using a second formula, wherein the second formula is: H Q H represents the cutting height, P represents a thickness of the roof, K A K represents an average broken coefficient of the rock stratum; and a fifth determination module, configured to determine the cutting angle by using a third formula, wherein the third formula is: θ represents the cutting angle, L represents a cantilever beam length, and h gThe height of the goaf is represented; the sixth determining module is configured to determine a strategy of cutting the roof according to the cutting angle and the cutting height as the cutting strategy.

[0082] In an optional embodiment, the roof cutting device of the large depth recovery roadway further comprises: a fourth determining unit configured to determine that the fracture position does not meet the preset roof cutting condition when the target distance is zero and the overhanging roof area is not greater than an area threshold, wherein the target distance is a distance between the fracture position and the goaf, and the overhanging roof area is an area of the overhanging roof in the large depth recovery roadway; a fifth determining unit configured to determine that the fracture position does not meet the preset roof cutting condition when the target distance is greater than zero and is not greater than a roadway width of the large depth recovery roadway; a third obtaining unit configured to continue stress monitoring and dynamic load monitoring on the roof to obtain a target monitoring result when the fracture position does not meet the preset roof cutting condition; and a second cutting unit configured to cut the roof according to a target cutting strategy when it is determined according to the target monitoring result that the roof needs to be cut, wherein the target cutting strategy is a strategy generated based on the current fracture position of the roof.

[0083] According to another aspect of the embodiments of the present application, there is also provided a roof cutting system of a large depth recovery roadway, which uses any of the above-mentioned roof cutting methods of the large depth recovery roadway.

[0084] According to another aspect of the embodiments of the present application, there is also provided a computer readable storage medium comprising a stored program, wherein the program executes any of the above-mentioned roof cutting methods of the large depth recovery roadway.

[0085] According to another aspect of the embodiments of the present application, there is also provided a computer readable storage medium comprising a stored program, wherein the program executes any of the above-mentioned roof cutting methods of the large depth recovery roadway.

[0086] Optionally, in the present embodiment, the above-mentioned computer readable storage medium can be located in any one of the computer terminals in the computer terminal group in the computer network, or in any one of the communication devices in the communication device group.

[0087] Optionally, in the embodiment, the computer readable storage medium is configured to store program code for performing the following steps: monitoring stress and dynamic load of the roof of the large buried depth mining roadway during mining of the large buried depth mining roadway, the large buried depth mining roadway refers to a roadway with a buried depth greater than a depth threshold; in the case that the monitoring result indicates that the current stress of the roof is higher than a stress threshold and / or the current dynamic load of the roof is higher than a dynamic load threshold, predicting a fracture position of the roof fracture based on a state parameter of the roof and a fracture mechanics model, the state parameter represents a current deformation degree of the roof, and the fracture mechanics model refers to a model for analyzing the mechanical behavior of the roof fracture by using the principles of engineering mechanics; in the case that the fracture position meets a preset roof cutting condition, generating a cutting strategy for cutting the roof according to the fracture position; and cutting a roof cutting area in the roof according to the cutting strategy, so that the cut roof reaches a stable state, wherein the stable state refers to a state in which the current stress of the roof is not higher than the stress threshold and the current dynamic load of the roof is not higher than the dynamic load threshold.

[0088] Optionally, in the embodiment, the computer readable storage medium is configured to store program code for performing the following steps: analyzing the bending moment at each position in the roof based on a state parameter of the roof and a fracture mechanics model, to obtain an analysis result, wherein the bending moment refers to the moment of flexural deformation at any position in the rock stratum of the roof; and determining the position of the maximum bending moment in the roof as the fracture position, wherein the maximum bending moment refers to the moment of flexural deformation in the rock stratum of the roof that is the maximum value among all moments.

[0089] Optionally, in the embodiment, the computer readable storage medium is configured to store program code for performing the following steps: calculating the position of the maximum bending moment in the roof by using a first formula to obtain the fracture position, wherein the first formula is: x represents the distance between the fracture position and the goaf, β represents the complex part of the general solution of the bending equation, α represents the real part of the general solution of the bending equation, M0 represents the bending moment, Q0 represents the beam shear force, and r and s represent different intermediate parameters.

[0090] Optionally, in the embodiment, the computer readable storage medium is configured to store program code for performing the following steps: obtaining a roadway width of the large depth mining roadway and a coal pillar width of a coal pillar, wherein the coal pillar refers to a coal pillar in the large depth mining roadway for supporting a roof; calculating a sum of the roadway width and the coal pillar width to obtain a width threshold; determining a distance between the fracture position and the goaf as a target distance; in a case that the target distance is zero, obtaining a hanging roof area of a hanging roof in the large depth mining roadway, wherein the hanging roof refers to a rock stratum hanging above the goaf in the large depth mining roadway; in a case that the hanging roof area is greater than an area threshold, determining that the fracture position meets a preset roof cutting condition; in a case that the target distance is not zero, if the target distance is within an interval range composed of the roadway width and the width threshold, determining that the fracture position meets the preset roof cutting condition.

[0091] Optionally, in the embodiment, the computer readable storage medium is configured to store program code for performing the following steps: if the target distance is greater than the roadway width and is not greater than the width threshold, the fracture position is above the large depth mining roadway, and it is determined that the fracture position meets the preset roof cutting condition; if the target distance is greater than the width threshold, the fracture position is above a coal wall, and it is determined that the fracture position meets the preset roof cutting condition.

[0092] Optionally, in the embodiment, the computer readable storage medium is configured to store program code for performing the following steps: in a case that the fracture position meets the preset roof cutting condition, determining a cutting parameter for cutting the roof according to the fracture position, wherein the cutting parameter comprises a cutting height and a cutting angle, the cutting height refers to a rock stratum depth to be cut when the roof is cut, and the cutting angle refers to an angle at which the rock stratum is cut when the roof is cut; determining the cutting height by using a second formula, wherein the second formula is: H Q H represents the cutting height, P represents a thickness of the roof, K A represents an average broken coefficient of the rock stratum; determining the cutting angle by using a third formula, wherein the third formula is: θ represents the cutting angle, L represents a cantilever beam length, h g represents a height of the goaf; and taking a strategy of cutting the roof according to the cutting angle and the cutting height as a cutting strategy.

[0093] Optionally, in the embodiment, the computer readable storage medium is configured to store program code for performing the following steps: determining that the fracture position does not meet the preset top cutting condition in a case that the target distance is zero and the overhang area is not greater than an area threshold, wherein the target distance is a distance between the fracture position and the goaf, and the overhang area is an area of an overhang in the large buried depth mining roadway; determining that the fracture position does not meet the preset top cutting condition in a case that the target distance is greater than zero and not greater than a roadway width of the large buried depth mining roadway; continuing to perform stress monitoring and dynamic load monitoring on the roof to obtain a target monitoring result in a case that the fracture position does not meet the preset top cutting condition; and performing top cutting treatment on the roof according to a target cutting strategy in a case that it is determined according to the target monitoring result that the top cutting treatment is needed, wherein the target cutting strategy is a strategy generated based on the current fracture position of the roof.

[0094] According to another aspect of the embodiment of the present application, a processor is also provided, which is used to run a program, wherein the program performs any of the above-described top cutting methods for large buried depth mining roadways when running.

[0095] According to another aspect of the embodiment of the present application, a computer program product is also provided, which includes computer instructions, and the computer instructions perform any of the above-described top cutting methods for large buried depth mining roadways when executed by a processor.

[0096] The above-mentioned embodiment numbers of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0097] In the above-described embodiments of the present application, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0098] In several embodiments provided in the present application, it should be understood that the disclosed technical contents can be implemented by other ways. Among them, the above-described device embodiments are only schematic, for example, the division of the units can be a logical function division, and actual implementation can have another division way, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed each other can be through some interface, indirect coupling or communication connection between units or modules, which can be electrical or other forms.

[0099] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on multiple units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0100] In addition, each function unit in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present separately, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software function unit.

[0101] When the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application, essentially or the part that contributes to the prior art, or all or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, including a number of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in each embodiment of the present application. The foregoing storage medium includes: a U disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a mobile hard disk, a magnetic disk or an optical disk, and various media that can store program codes.

[0102] The above is only the preferred embodiment of the present application, and it should be pointed out that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be considered as the protection scope of the present application.

Claims

1. A roof cutting method for a large depth mining roadway, characterized in that, The method comprises the following steps: In the process of mining a large-buried-depth recovery roadway, the stress and dynamic load of the roof of the large-buried-depth recovery roadway are monitored to obtain monitoring results, wherein the large-buried-depth recovery roadway refers to a roadway with a buried depth greater than a depth threshold; In a case where the monitoring results indicate that the current stress of the roof is higher than a stress threshold and / or the current dynamic load of the roof is higher than a dynamic load threshold, a breaking mechanics model is used to predict a breaking position of the roof breaking based on a state parameter of the roof, wherein the state parameter represents the current deformation degree of the roof, and the breaking mechanics model refers to a model for analyzing the mechanical behavior of the roof breaking by using the principles of engineering mechanics; In a case where the breaking position meets a preset roof cutting condition, a cutting strategy for cutting the roof is generated according to the breaking position; According to the cutting strategy, a cutting area in the roof is cut to make the cut roof reach a stable state, wherein the stable state refers to a state in which the current stress of the roof is not higher than the stress threshold and the current dynamic load of the roof is not higher than the dynamic load threshold, In a case where the monitoring results indicate that the current stress of the roof is higher than a stress threshold and / or the current dynamic load of the roof is higher than a dynamic load threshold, a breaking mechanics model is used to predict a breaking position of the roof breaking based on a state parameter of the roof, comprising: analyzing the bending moment of each position in the roof by using the breaking mechanics model based on the state parameter of the roof to obtain an analysis result, wherein the bending moment refers to the moment of bending deformation at any position in the rock stratum of the roof; and determining the position where the maximum bending moment is located in the roof as the breaking position, wherein the maximum bending moment refers to the moment of bending deformation in the rock stratum of the roof being the maximum value among all the moments, According to the analysis result, the position of the maximum bending moment in the roof is determined as the fracture position, comprising: using a first formula to calculate the position of the maximum bending moment in the roof to obtain the fracture position, wherein the first formula is: , x represents the distance between the fracture position and the goaf, represents the complex part of the general solution in the bending equation, represents the real part of the general solution in the bending equation, represents the bending moment, represents the beam shear force, and r and s represent different intermediate parameters, respectively.

2. The method for cutting the roof of a large depth recovery roadway according to claim 1, characterized in that, Before generating a cutting strategy for cutting the roof according to the breaking position, the method further comprises the following steps: Obtaining a roadway width of the large-buried-depth recovery roadway and a coal pillar width of a coal pillar, wherein the coal pillar refers to a coal pillar in the large-buried-depth recovery roadway for supporting the roof; Calculating the sum of the roadway width and the coal pillar width to obtain a width threshold; Determining a distance between the breaking position and a goaf as a target distance; In a case where the target distance is zero, obtaining a hanging roof area of a hanging roof in the large-buried-depth recovery roadway, wherein the hanging roof refers to a rock stratum hanging above the goaf in the large-buried-depth recovery roadway; In a case where the hanging roof area is greater than an area threshold, it is determined that the breaking position meets the preset roof cutting condition; In a case where the target distance is not zero, if the target distance is within an interval range composed of the roadway width and the width threshold, it is determined that the breaking position meets the preset roof cutting condition.

3. The method for top cutting of a deep depth mining roadway according to claim 2, characterized in that, If the target distance is within the interval range, it is determined that the breaking position meets the preset roof cutting condition, comprising one of the following: If the target distance is greater than the roadway width and is not greater than the width threshold, the fracture position is above the large depth mining roadway, and it is determined that the fracture position meets the preset top cutting condition; If the target distance is greater than the width threshold, the fracture position is above the coal wall, and it is determined that the fracture position meets the preset top cutting condition.

4. The method for roof cutting of a deep depth mining roadway according to claim 1, characterized in that, In a case where the fracture position meets the preset top cutting condition, a cutting strategy for cutting the roof is generated according to the fracture position, including: In a case where the fracture position meets the preset top cutting condition, a cutting parameter for cutting the roof is determined according to the fracture position, wherein the cutting parameter includes a top cutting height and a top cutting angle, the top cutting height refers to a stratum depth to be cut when the roof is cut, and the top cutting angle refers to an angle at which the stratum is cut when the roof is cut; determining the height of the top cutting using a second formula, wherein the second formula is: , denotes the height of the top cutting, P denotes the thickness of the roof, denotes the average coefficient of dilatancy of the rock formation; The third formula is used to determine the top cutting angle, wherein the third formula is: , represents the top cutting angle, L represents the length of the cantilever beam, represents the height of the goaf, and b represents the width of the mining roadway. The strategy for cutting the roof according to the top cutting angle and the top cutting height is taken as the cutting strategy.

5. The method for cutting the roof of a deep depth mining roadway according to claim 1, characterized in that, Further comprising: In a case where the target distance is zero and the overhanging roof area is not greater than an area threshold, it is determined that the fracture position does not meet the preset top cutting condition, wherein the target distance is a distance between the fracture position and the goaf, and the overhanging roof area is an area of the overhanging roof in the large depth mining roadway; In a case where the target distance is greater than zero and is not greater than a roadway width of the large depth mining roadway, it is determined that the fracture position does not meet the preset top cutting condition; In a case where the fracture position does not meet the preset top cutting condition, stress monitoring and dynamic load monitoring of the roof are continued to obtain a target monitoring result; In a case where it is determined according to the target monitoring result that the roof needs to be cut, the roof is cut according to a target cutting strategy, wherein the target cutting strategy is a strategy generated based on the current fracture position of the roof.

6. A roof cutting device for a deep mining roadway, characterized in that, Comprising: A monitoring unit configured to monitor stress and dynamic load of a roof of a large depth mining roadway during mining of the large depth mining roadway to obtain a monitoring result, wherein the large depth mining roadway refers to a roadway with a depth greater than a depth threshold; A prediction unit configured to, in a case where the monitoring result indicates that a current stress of the roof is higher than a stress threshold and / or a current dynamic load of the roof is higher than a dynamic load threshold, predict a fracture position of the roof according to a state parameter of the roof and a fracture mechanics model, wherein the state parameter represents a current deformation degree of the roof, and the fracture mechanics model refers to a model for analyzing a mechanical behavior of fracture of the roof by using principles of engineering mechanics; A generation unit configured to, in a case where the fracture position meets a preset top cutting condition, generate a cutting strategy for cutting the roof according to the fracture position. a first cutting unit configured to cut a top-removing area in the top plate according to the cutting strategy, so that the top plate after cutting reaches a stable state, wherein the stable state refers to a state in which the current stress of the top plate is not higher than the stress threshold and the current dynamic load is not higher than the dynamic load threshold, the prediction unit comprises: an acquisition module configured to analyze a bending moment at each position in the top plate based on a state parameter of the top plate by using the fracture mechanics model, to obtain an analysis result, wherein the bending moment refers to a moment of force that causes bending deformation at any position in the rock stratum of the top plate; and a determination module configured to determine a position of a maximum bending moment in the top plate as the fracture position according to the analysis result, wherein the maximum bending moment refers to the moment of force that causes bending deformation in the rock stratum of the top plate being the maximum value among all the moments of force, The determining module comprises an obtaining submodule for calculating the position of the maximum bending moment in the roof by using a first formula to obtain the fracture position, wherein the first formula is: x represents the distance between the fracture position and the goaf, represents the complex part of the general solution in the bending equation, represents the real part of the general solution in the bending equation, represents the bending moment, represents the beam shear force, and r and s represent different intermediate parameters, respectively.

7. A computer readable storage medium characterized in that, the computer readable storage medium comprises a stored program, wherein the program performs the top-removing method of the large-depth mining roadway according to any one of claims 1 to 5.

8. A computer program product comprising computer instructions, characterized in that, the computer instructions are executed by the processor to perform the top-removing method of the large-depth mining roadway according to any one of claims 1 to 5.

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