Coal wall spalling prevention method and device, electronic equipment and storage medium

Abstract

The present application provides a coal wall spalling prevention method, device, electronic equipment and storage medium, the method comprises: obtaining the support load of the hydraulic support; determining the target hydraulic support in the plurality of hydraulic supports according to the support load of the hydraulic support; determining the target spray gun matched with the target hydraulic support; controlling the target spray gun to spray the protective material to the spalling risk area corresponding to the target hydraulic support, the protective material is used to improve the rock mass compressive strength and rock mass tensile strength of the coal wall, on the one hand, the reliability and flexibility of the coal wall spalling protection are improved through the spraying mode, the potential safety risk of the construction personnel is reduced, on the other hand, the spraying construction and the coal wall mining construction are independent of each other, so that the negative interference of the spalling reinforcement on the coal wall mining construction can be effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of coal mining technology, and in particular to a method, device, electronic equipment, and storage medium for preventing coal wall spalling. Background Technology

[0002] High-extraction mining technology offers advantages such as high mining efficiency, low gangue mixing rate, and promising prospects for intelligent equipment application in thick and extra-thick coal seam mining. With the rapid development of integrated mechanization, automation, and intelligent mining technologies in coal mining equipment, high-extraction mining technology has become increasingly mature, and mining heights are constantly increasing. However, the increase in mining height is accompanied by increased roof pressure, leading to a sharp rise in the risk of coal face instability. Coal face spalling accidents, especially severe spalling accidents, in high-extraction mining can cause temporary shutdowns of the working face, resulting in significant losses and even casualties, severely hindering the safe, efficient, and sustainable development of coal mines.

[0003] In related technologies, measures to prevent coal wall spalling are mainly divided into two categories: reducing coal wall pressure and improving the mechanical properties of the coal. However, these measures require adjustments to the normal construction process during implementation. Due to the complexity and time-consuming nature of the construction process, there are problems such as significant interference with normal construction operations and high safety risks during manual operations. Summary of the Invention

[0004] To address the problems existing in the prior art, embodiments of the present invention provide a method, apparatus, electronic device, and storage medium for preventing coal wall spalling.

[0005] In a first aspect, the present invention provides a method for preventing coal wall spalling, applied to a coal wall spalling prevention system. The coal wall spalling prevention system includes several hydraulic supports and a spraying device. The spraying device includes several spray guns, and each of the hydraulic supports has a spray gun positioned between its column and the coal wall.

[0006] Obtain the support load of the hydraulic support;

[0007] Based on the support load of the hydraulic support, determine the target hydraulic support among the plurality of hydraulic supports;

[0008] Determine the target spray gun that matches the target hydraulic support;

[0009] The target spray gun is controlled to spray protective material onto the risk area of ​​the coal wall corresponding to the target hydraulic support. The protective material is used to improve the compressive and tensile properties of the coal wall.

[0010] In some embodiments, determining the target hydraulic support among the plurality of hydraulic supports based on the support load of the hydraulic support includes:

[0011] Determine the mapping relationship between the support load and time of the hydraulic support;

[0012] Based on the mapping relationship between the support load and time, the support load resistance increase rate of the hydraulic support is determined;

[0013] The target hydraulic support is determined among the plurality of hydraulic supports based on the support load resistance increase rate of the hydraulic support.

[0014] In some embodiments, determining the support load resistance increase rate of the hydraulic support based on the mapping relationship between the support load and time includes:

[0015] Determine the film support timeline;

[0016] Based on the time point of the film, a first target time point and a second target time point are determined. The first target time point and the second target time point are less than or equal to the time point of the film, and the first target time point and the second target time point are spaced apart by a preset time.

[0017] Based on the mapping relationship between the support load and time, determine the first target support load corresponding to the first target time point and the second target support load corresponding to the second target time point;

[0018] The load increase rate of the hydraulic support is determined based on the first target support load and the second target support load.

[0019] In some embodiments, determining the target hydraulic support among the plurality of hydraulic supports based on the support load resistance increase rate of each of the hydraulic supports includes:

[0020] Based on the support load resistance increase rate of each hydraulic support, determine the average support load resistance increase rate corresponding to the plurality of hydraulic supports.

[0021] Based on the average support load resistance increase rate, the target hydraulic support among the plurality of hydraulic supports is determined.

[0022] In some embodiments, controlling the target spray gun to spray protective material onto the risk area of ​​the corresponding panel of the target hydraulic support includes:

[0023] Determine the reinforcement risk coefficient corresponding to the coal wall;

[0024] The area to be sprayed for reinforcement is determined based on the reinforcement risk coefficient, the height of the coal wall, and the width of the target hydraulic support.

[0025] Control the target spray gun to spray the protective material of the sprayed reinforcement area onto the risk area of ​​the corresponding panel of the target hydraulic support.

[0026] In some embodiments, the elevation angle of the spray gun, the depression angle of the spray gun, the distance between the spray gun and the coal wall, and the height of the coal wall satisfy the following relationship:

[0027] l×[tan(a1)+tan(a2)]≥H

[0028] Where H is the height of the coal wall, a1 is the elevation angle of the spray gun, a2 is the depression angle of the spray gun, and l is the distance between the spray gun and the coal wall.

[0029] In some embodiments, the protective material meets at least one of the following requirements:

[0030] The adhesive strength of the protective material is greater than the preset adhesive strength;

[0031] The tensile strength of the protective material is greater than the preset compressive strength;

[0032] The elongation rate of the protective material is greater than the preset elongation rate;

[0033] The protective material is non-flammable;

[0034] The surface drying time of the protective material is less than the preset time.

[0035] Secondly, the present invention also provides a coal wall spalling prevention device, comprising:

[0036] The acquisition module is used to acquire the support load of the hydraulic support;

[0037] The first determining module is used to determine the target hydraulic support among the plurality of hydraulic supports based on the support load of the hydraulic support.

[0038] The second determining module is used to determine the target spray gun that matches the target hydraulic support;

[0039] The spraying module is used to control the target spray gun to spray protective material onto the risk area of ​​the coal face corresponding to the target hydraulic support. The protective material is used to improve the rock mass compressive strength and tensile strength of the coal face.

[0040] Thirdly, the present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement any of the coal wall spalling prevention methods described above.

[0041] Fourthly, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the coal wall spalling prevention method as described above.

[0042] The coal wall spalling prevention method, device, electronic equipment, and storage medium provided by this invention acquire the support load of the hydraulic support; determine the target hydraulic support among several hydraulic supports based on the support load; determine the target spray gun matched with the target hydraulic support; and control the target spray gun to spray protective material onto the spalling risk area corresponding to the target hydraulic support. The protective material is used to improve the rock mass compressive and tensile properties of the coal wall. On the one hand, the spraying method improves the reliability and flexibility of coal wall spalling protection and reduces the potential safety risks of coal wall spalling protection to construction personnel. On the other hand, the spraying construction and coal wall mining construction are independent of each other, thereby effectively reducing the negative interference of spalling reinforcement on coal wall mining construction. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0044] Figure 1 This is one of the flowcharts of the coal wall spalling prevention method provided by the present invention;

[0045] Figure 2 This is the curve showing the relationship between the load and time of the support provided by the present invention;

[0046] Figure 3 This is a schematic diagram of the hydraulic support and spray gun in the coal wall flaring system provided by the present invention.

[0047] Figure 4 This is the second schematic diagram of the coal wall spalling prevention method provided by the present invention;

[0048] Figure 5 This is a schematic diagram of the structure of the coal wall spalling prevention device provided by the present invention;

[0049] Figure 6 This is a schematic diagram of the structure of the electronic device provided by the present invention;

[0050] Figure label:

[0051] 1: Top strata;

[0052] 2: Spray gun;

[0053] 3: Elastic zone of the coal wall;

[0054] 4: Coal wall plastic zone;

[0055] 5: Hydraulic support. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0057] High-extraction mining technology offers advantages such as high mining efficiency, low gangue mixing rate, and promising prospects for intelligent equipment application in thick and extra-thick coal seam mining. With the rapid development of integrated mechanization, automation, and intelligent mining technologies in coal mining equipment, high-extraction mining technology has become increasingly mature, and mining heights are constantly increasing. However, the increase in mining height is accompanied by increased roof pressure, leading to a sharp rise in the risk of coal face instability. Coal face spalling accidents, especially severe spalling accidents, in high-extraction mining can cause temporary shutdowns of the working face, resulting in significant losses and even casualties, severely hindering the safe, efficient, and sustainable development of coal mines.

[0058] It should be noted that early warning and control in coal mining are often separated in practice, hindering the effectiveness of coal face spalling prevention. Related technologies for coal face spalling prevention mainly fall into two categories: reducing coal face pressure and improving the mechanical properties of the coal body. Methods for reducing coal face pressure mainly include increasing the initial support force and support resistance, reducing mining height, and decreasing the distance between the roof and the unsupported area. Methods for changing coal body properties mainly include coal body grouting reinforcement and anchor bolt support (combined with wooden anchor bolts and sidewall plates).

[0059] The implementation of these measures requires adjustments to the normal construction process. Due to the complexity and time-consuming nature of the process, there are issues such as significant disruption to normal construction operations and high safety risks associated with manual operations. Furthermore, the stress environment of coal wall spalling is highly sensitive to changes. As the working face of the coal wall advances continuously and the spatiotemporal stress environment of the roof and coal wall changes rapidly, underground roof and spalling often occur instantaneously, exhibiting a clear "sudden" characteristic.

[0060] In summary, the contradiction between the narrow time window for prevention and control in rural areas and the time-consuming and complex prevention and control process means that the problem of the separation between prediction and control is difficult to solve in the long term. "Delayed prevention and control" and "ineffective prevention and control" seriously restrict the realization of the effect of rural area control.

[0061] Therefore, this invention proposes a method for preventing coal wall spalling. This method involves obtaining the support load of a hydraulic support; determining a target hydraulic support among several hydraulic supports based on the support load; identifying a target spray gun matched to the target hydraulic support; and controlling the target spray gun to spray protective material onto the spalling risk area corresponding to the target hydraulic support. The protective material is used to improve the compressive and tensile strength of the coal wall rock mass. On the one hand, the spraying method improves the reliability and flexibility of coal wall spalling protection, reducing the potential safety risks to construction personnel. On the other hand, the spraying construction and coal wall mining construction are independent of each other, thus effectively reducing the negative interference of spalling reinforcement on coal wall mining construction.

[0062] The technical solution of the present invention will now be described in detail with reference to the accompanying drawings. Figure 1 This is one of the flowcharts illustrating the coal wall spalling prevention method provided by the present invention. The method is applied to a coal wall spalling prevention system, which includes several hydraulic supports and a spraying device. The spraying device includes several spray guns, and each hydraulic support has a spray gun positioned between its column and the coal wall. The executing entity for each step in this method can be the coal wall spalling prevention device within the coal wall spalling prevention system. This device can be implemented through software and / or hardware, and can be integrated into an electronic device. The electronic device can be a terminal device (such as a smartphone, personal computer, learning machine, etc.), a server (such as a local server or cloud server, or a server cluster, etc.), a processor, or a chip, etc. Figure 1 As shown, the method may include the following steps:

[0063] Step 101: Obtain the support load of the hydraulic support;

[0064] In specific application scenarios, pressure sensors can be installed on the support columns of hydraulic supports to obtain the support load of the hydraulic supports.

[0065] In one example, such as Figure 2 As shown, the hydraulic support load changes over time during coal face mining. The curve of support load versus time is obtained by plotting time on the x-axis and support load on the y-axis.

[0066] Step 102: Determine the target hydraulic support among the plurality of hydraulic supports based on the support load of the hydraulic support.

[0067] Among them, the target hydraulic support refers to the hydraulic support that supports the coal wall area that is a risk zone of coal wall collapse.

[0068] It should be noted that after the ore seam is mined out, a gap appears in the roof strata of the goaf, and the pressure is transferred to the coal wall. The pressure on the coal wall increases, forming a pressure-increasing zone. Under the action of the additional load, some of the coal is crushed and squeezed into the goaf. This phenomenon is called spalling. Therefore, there is a significant difference between the support load in the spalling risk zone and the support load in the spalling non-risk zone.

[0069] In one example, a target hydraulic support can be selected from several hydraulic supports based on how the support load changes over time.

[0070] In one example, after determining the time point when coal wall spalling occurs, the support load data for a certain period of time can be selected from the support load versus time curve of the hydraulic support based on the time point when coal wall spalling occurs. The target hydraulic support can then be selected based on the support load data for that period of time.

[0071] Step 103: Determine the target spray gun that matches the target hydraulic support;

[0072] Specifically, a mapping relationship is pre-established between the support number of the hydraulic support and the spray gun number of the spray gun. After the target hydraulic support is determined, the spray gun number matching the support number of the target hydraulic support is determined according to the mapping relationship between their numbers, thereby determining the corresponding target spray gun.

[0073] Step 104: Control the target spray gun to spray protective material onto the risk area of ​​the rock face corresponding to the target hydraulic support. The protective material is used to improve the rock mass compressive strength and tensile strength of the coal face.

[0074] In this embodiment, a "wet spraying" method is used for spraying. Specifically, the protective material is mixed with water and stirred thoroughly in the spraying device to prepare a slurry. The slurry is then transported to each spray gun through the delivery pipe of the spraying device. After the target spray gun is determined, the slurry at the target spray gun can be controlled by compressed air. After the slurry is sprayed, it adheres to the corresponding coal wall surface and penetrates into the coal wall cracks to improve the strength of the coal wall itself. At the same time, since the protective material itself has good tensile and compressive strength, the slurry prepared from the protective material will quickly form a thin film shell on the coal wall surface after air drying, which can play a supporting role. This effectively improves the horizontal stress state of the coal wall, further enhances the stability of the coal wall, and avoids the risk of large-area coal wall spalling during the pressure of the working face roof.

[0075] Specifically, in this embodiment, the elevation angle of the spray gun, the depression angle of the spray gun, the distance between the spray gun and the coal wall, and the height of the coal wall satisfy the following relationships:

[0076] l×[tan(a1)+tan(a2)]≥H

[0077] Where H is the height of the coal wall, a1 is the elevation angle of the spray gun, a2 is the depression angle of the spray gun, and l is the distance between the spray gun and the coal wall.

[0078] refer to Figure 3 The coal wall is located between two upper and lower roof rock layers 1. The coal wall includes an elastic zone 3 and a plastic zone 4. A spray gun 2 is installed between the coal wall and the hydraulic support 5. The height H of the coal wall is the vertical height of the coal wall between the upper and lower roof rock layers 1. The elevation angle a1 and depression angle a2 of the spray gun 2 are shown in the figure. The distance l between the spray gun 2 and the coal wall is the horizontal distance from the nozzle of the spray gun 2 to the plastic zone 4 of the coal wall.

[0079] In this embodiment, by ensuring that the elevation angle of the spray gun, the depression angle of the spray gun, the distance between the spray gun and the coal wall, and the height of the coal wall satisfy the above-mentioned relationships, the protective material sprayed by the spray gun can fully cover the risk area of ​​coal wall spalling.

[0080] Furthermore, in order to minimize the potential interference of spray reinforcement on normal production at the working face, while achieving a significant improvement in coal wall strength after spraying, the protective material in this embodiment, in addition to being a powder material, must also meet at least one of the following requirements:

[0081] The bonding strength of the protective material is greater than the preset bonding strength, for example, greater than 1.5 times the cohesion of the elastic coal.

[0082] The tensile strength of the protective material is greater than the preset compressive strength, for example, greater than 1.5 times the tensile strength of elastic coal.

[0083] The elongation rate of the protective material is greater than the preset elongation rate, for example, greater than 10%;

[0084] The protective material must be non-flammable;

[0085] The surface drying time of the protective material is less than the preset time. The surface drying time refers to the time when the material is not sticky to the touch, such as less than 1.1 times the cycle time of a single-blade coal cutting.

[0086] The coal wall spalling prevention method provided by this invention involves: obtaining the support load of a hydraulic support; determining a target hydraulic support among several hydraulic supports based on the support load; determining a target spray gun matched to the target hydraulic support; and controlling the target spray gun to spray protective material onto the spalling risk area corresponding to the target hydraulic support. The protective material is used to improve the rock mass compressive and tensile properties of the coal wall. On the one hand, the spraying method improves the reliability and flexibility of coal wall spalling protection and reduces the potential safety risks of coal wall spalling protection to construction personnel. On the other hand, the spraying construction and coal wall mining construction are independent of each other, thereby effectively reducing the negative interference of spalling reinforcement on coal wall mining construction.

[0087] In some embodiments, determining the target hydraulic support among the plurality of hydraulic supports based on the support load of the hydraulic support includes:

[0088] Determine the mapping relationship between the support load and time of the hydraulic support;

[0089] Based on the mapping relationship between the support load and time, the support load resistance increase rate of the hydraulic support is determined;

[0090] The target hydraulic support is determined among the plurality of hydraulic supports based on the support load resistance increase rate of the hydraulic support.

[0091] In this embodiment, reference Figure 2 The system can collect data on the hydraulic support load over a period of time during coal face mining. Plotting time on the x-axis and support load on the y-axis yields a curve showing the relationship between support load and time, thus establishing the mapping relationship between the hydraulic support load and time. Analysis of this curve further reveals the rate of increase in hydraulic support load resistance. In this embodiment, the rate of increase in hydraulic support load resistance can be obtained from the support load at two time points, or from the support load at multiple time points; there is no limitation on this.

[0092] In this embodiment, the coal wall area corresponding to each hydraulic support is monitored to determine whether it is a risk area for rockfall based on the rate of increase in resistance of the hydraulic support load. If it is a risk area for rockfall, the corresponding hydraulic support is the target hydraulic support.

[0093] Understandably, if the load increase rate of the support in the risk zone is greater than that in the non-risk zone, then the hydraulic support whose load increase rate exceeds the average support load increase rate can be used as the target hydraulic support. Alternatively, the hydraulic support whose load increase rate exceeds a preset increase rate threshold can also be used as the target hydraulic support. The specific adjustments can be made flexibly according to the actual situation, and there are no restrictions on this.

[0094] The coal wall spalling prevention method provided by this invention determines the mapping relationship between the support load and time of hydraulic supports; based on the mapping relationship, it determines the resistance increase rate of the hydraulic support load; and based on the resistance increase rate of the hydraulic support load, it identifies target hydraulic supports among several hydraulic supports. By monitoring the changes in the support load of the hydraulic supports, it can promptly screen out target hydraulic supports corresponding to spalling risk areas. This effectively solves the problems of narrow time windows for spalling prevention and control, difficulty in grasping the timing of prevention and control, disconnect between early warning and prevention, and poor spalling control effects caused by the constantly changing mining space and coal wall stress environment. This improves the efficiency and timeliness of protection.

[0095] In some implementations, determining the support load resistance increase rate of the hydraulic support based on the mapping relationship between the support load and time includes:

[0096] Determine the film support timeline;

[0097] Based on the time point of the film, a first target time point and a second target time point are determined. The first target time point and the second target time point are less than or equal to the time point of the film, and the first target time point and the second target time point are spaced apart by a preset time.

[0098] Based on the mapping relationship between the support load and time, determine the first target support load corresponding to the first target time point and the second target support load corresponding to the second target time point;

[0099] The load increase rate of the hydraulic support is determined based on the first target support load and the second target support load.

[0100] Among them, the coal wall spalling time point refers to the time point at which the coal wall spalling phenomenon occurs.

[0101] In this embodiment, after determining that coal wall spalling has occurred, the corresponding spalling time point is determined. Then, based on the spalling time point, the first target time point and the second target time point are determined. The spalling time point can be selected as the first time point, or the time point T minutes before the spalling time point can be selected as the first time point. There is no restriction on this.

[0102] For example, if the preset duration is Δt, and the support load corresponding to the time point at which the second target is detected is P... tm The support load corresponding to the first target time point after the Δt interval is P. (t+△t)m The resistance increase rate ΔP of the support load during the interval Δt can then be calculated. m =(P (t+△t)m -P tm ) / △t.

[0103] In some implementations, determining the target hydraulic support among the plurality of hydraulic supports based on the support load resistance increase rate of each of the hydraulic supports includes:

[0104] Based on the support load resistance increase rate of each hydraulic support, determine the average support load resistance increase rate corresponding to the plurality of hydraulic supports.

[0105] Based on the average support load resistance increase rate, the target hydraulic support among the plurality of hydraulic supports is determined.

[0106] In this embodiment, after obtaining the support load resistance increase rate of all hydraulic supports when coal wall spalling occurs, the average support load resistance increase rate corresponding to several hydraulic supports is determined, and the average support load resistance increase rate is used as an indicator warning value to identify the spalling risk area and the spalling non-risk area.

[0107] After obtaining the average support load resistance increase rate, if the support load resistance increase rate of hydraulic support i is greater than the average support load resistance increase rate, it indicates that the coal wall area supported by hydraulic support i is a risk area for coal wall spalling, that is, hydraulic support i is the target hydraulic support corresponding to the spray gun that needs to be controlled for subsequent spraying.

[0108] The coal wall spalling prevention method provided by the present invention identifies the target hydraulic support corresponding to the spalling risk zone by analyzing the support load status within a preset time period before the occurrence of coal wall spalling.

[0109] In some implementations, controlling the target spray gun to spray protective material onto the risk area of ​​the corresponding panel of the target hydraulic support includes:

[0110] Determine the reinforcement risk coefficient corresponding to the coal wall;

[0111] The area to be sprayed for reinforcement is determined based on the reinforcement risk coefficient, the height of the coal wall, and the width of the target hydraulic support.

[0112] Control the target spray gun to spray the protective material of the sprayed reinforcement area onto the risk area of ​​the corresponding panel of the target hydraulic support.

[0113] The reinforcement risk coefficient is determined based on the strength of the coal face and is usually not less than 1.5.

[0114] Specifically, the area reinforced by spraying Where i is the support number; H is the coal wall height; L i C represents the width of the support frame; C represents the reinforcement risk factor.

[0115] Furthermore, in this embodiment, the spraying time can be dynamically adjusted. For example, for each target hydraulic support corresponding to a sub-risk area in the risk area of ​​the panel, the greater the resistance increase rate of the support load of the target hydraulic support corresponding to the sub-risk area, the longer its corresponding spraying time can be.

[0116] The coal wall spalling prevention method provided by this invention can dynamically adjust the spraying time and spraying area according to the predicted range of the spalling risk zone and the resistance increase rate of the support load of each target hydraulic support.

[0117] The following are specific examples illustrating the implementation of the aforementioned methods for preventing coal wall spalling. For example... Figure 4 As shown, the method may include the following steps:

[0118] Step 401: Determine the threshold value of the resistance increase rate of the support bracket as an early warning indicator for the panel.

[0119] In this embodiment, the support load within a preset time period before each coal wall spalling can be extracted from the support load versus time curve, and the support load resistance increase rate corresponding to each coal wall spalling within the preset time period can be calculated.

[0120] Calculate the average value of the support load resistance increase rate corresponding to each coal wall spalling within a preset time period, and determine it as the threshold value of the support resistance increase rate for the spalling early warning index.

[0121] Step 402: Determine the risk area of ​​the rib spalling based on the calculation results of the resistance increase rate of each support on the working face;

[0122] According to the threshold of the support resistance increase rate as an early warning indicator for rock spalling, when the support column growth rate exceeds the threshold of the support resistance increase rate as an early warning indicator for rock spalling, the coal wall area within the support range is a rock spalling risk zone; otherwise, it is a non-risk zone.

[0123] Step 403: Spray coating to reinforce the coal wall in the support area of ​​the slope risk zone.

[0124] The "wet spraying" method involves pre-mixing the powdered spraying material with water and stirring it thoroughly to form a slurry, which is then transported to the spray gun and sprayed out. The slurry spraying not only achieves the purpose of coal wall reinforcement, but also has a good dust suppression effect.

[0125] After the sprayed slurry adheres to the surface of the broken coal face through the spraying system, it penetrates into the joints and fissures of the coal face, effectively improving its own strength. Furthermore, due to the good tensile and compressive strength of the sprayed material itself, the slurry will quickly form a thin film shell on the coal face surface after air drying, which can play a supporting role, effectively improving the horizontal stress state of the coal face, further enhancing the stability of the coal face, and avoiding the risk of large-area coal face spalling during the pressure from the working face roof.

[0126] The coal wall spalling prevention device provided by the present invention is described below. The coal wall spalling prevention device described below can be referred to in correspondence with the coal wall spalling prevention method described above.

[0127] Figure 5 This is a schematic diagram of the structure of the coal wall spalling prevention device provided by the present invention, as shown below. Figure 5As shown, the device includes: an acquisition module 510 for acquiring the support load of the hydraulic support; a first determination module 520 for determining a target hydraulic support among the plurality of hydraulic supports based on the support load of the hydraulic support; a second determination module 530 for determining a target spray gun matched with the target hydraulic support; and a spraying module 540 for controlling the target spray gun to spray protective material onto the risk area corresponding to the target hydraulic support, wherein the protective material is used to improve the rock mass compressive strength and rock mass tensile strength of the coal wall.

[0128] The coal wall spalling prevention device provided by this invention obtains the support load of the hydraulic support; determines the target hydraulic support among several hydraulic supports based on the support load; determines the target spray gun matched with the target hydraulic support; and controls the target spray gun to spray protective material onto the spalling risk area corresponding to the target hydraulic support. The protective material is used to improve the rock mass compressive strength and tensile strength of the coal wall. On the one hand, the spraying method improves the reliability and flexibility of coal wall spalling protection and reduces the potential safety risks of coal wall spalling protection to construction personnel. On the other hand, the spraying construction and coal wall mining construction are independent of each other, thereby effectively reducing the negative interference of spalling reinforcement on coal wall mining construction.

[0129] In some embodiments, the first determining module is configured to determine the mapping relationship between the support load and time of the hydraulic support; determine the support load resistance increase rate of the hydraulic support based on the mapping relationship between the support load and time; and determine the target hydraulic support among the plurality of hydraulic supports based on the support load resistance increase rate of the hydraulic support.

[0130] In some embodiments, the first determining module is configured to: determine a time point for the support plate; determine a first target time point and a second target time point based on the time point for the support plate, wherein the first target time point and the second target time point are less than or equal to the time point for the support plate, and the first target time point and the second target time point are spaced apart by a preset time period; determine a first target support load corresponding to the first target time point and a second target support load corresponding to the second target time point based on the mapping relationship between the support load and time; and determine the support load resistance increase rate of the hydraulic support based on the first target support load and the second target support load.

[0131] In some embodiments, the first determining module is configured to determine the average support load resistance increase rate corresponding to the plurality of hydraulic supports based on the support load resistance increase rate of each hydraulic support; and to determine the target hydraulic support among the plurality of hydraulic supports based on the average support load resistance increase rate.

[0132] In some embodiments, the spraying module is used to determine the reinforcement risk coefficient corresponding to the coal wall; determine the spraying reinforcement area based on the reinforcement risk coefficient, the height of the coal wall, and the support width of the target hydraulic support; and control the target spray gun to spray the protective material of the spraying reinforcement area onto the side risk area corresponding to the target hydraulic support.

[0133] In some embodiments, the elevation angle of the spray gun, the depression angle of the spray gun, the distance between the spray gun and the coal wall, and the height of the coal wall satisfy the following relationship:

[0134] l×[tan(a1)+tan(a2)]≥H

[0135] Where H is the height of the coal wall, a1 is the elevation angle of the spray gun, a2 is the depression angle of the spray gun, and l is the distance between the spray gun and the coal wall.

[0136] In some embodiments, the protective material meets at least one of the following requirements:

[0137] The adhesive strength of the protective material is greater than the preset adhesive strength;

[0138] The tensile strength of the protective material is greater than the preset compressive strength;

[0139] The elongation rate of the protective material is greater than the preset elongation rate;

[0140] The protective material is non-flammable;

[0141] The surface drying time of the protective material is less than the preset time.

[0142] Figure 6 This is a schematic diagram of the structure of the electronic device provided by the present invention, such as... Figure 6 As shown, the electronic device may include: a processor 610, a communication interface 620, a memory 630, and a communication bus 640, wherein the processor 610, the communication interface 620, and the memory 630 communicate with each other through the communication bus 640. The processor 610 can call logical instructions in the memory 630 to execute a coal wall spalling prevention method, which includes:

[0143] Obtain the support load of the hydraulic support;

[0144] Based on the support load of the hydraulic support, determine the target hydraulic support among the plurality of hydraulic supports;

[0145] Determine the target spray gun that matches the target hydraulic support;

[0146] The target spray gun is controlled to spray protective material onto the risk area of ​​the coal wall corresponding to the target hydraulic support. The protective material is used to improve the compressive and tensile properties of the coal wall.

[0147] Furthermore, the logical instructions in the aforementioned memory 630 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, essentially, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0148] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the coal wall spalling prevention method provided by the above methods, the method comprising:

[0149] Obtain the support load of the hydraulic support;

[0150] Based on the support load of the hydraulic support, determine the target hydraulic support among the plurality of hydraulic supports;

[0151] Determine the target spray gun that matches the target hydraulic support;

[0152] The target spray gun is controlled to spray protective material onto the risk area of ​​the coal wall corresponding to the target hydraulic support. The protective material is used to improve the compressive and tensile properties of the coal wall.

[0153] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0154] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0155] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preventing coal wall spalling, applied to a coal wall spalling prevention system, the coal wall spalling prevention system comprising a plurality of hydraulic supports and a spraying device, the spraying device comprising a plurality of spray guns, wherein each of the hydraulic supports has a spray gun positioned between its column and the coal wall, characterized in that, include: Obtain the support load of the hydraulic support; Based on the support load of the hydraulic support, a target hydraulic support is determined among several hydraulic supports; Determine the target spray gun that matches the target hydraulic support; The target spray gun is controlled to spray protective material onto the risk area of ​​the rock wall corresponding to the target hydraulic support. The protective material is used to improve the rock mass compressive strength and tensile strength of the coal wall. The step of determining a target hydraulic support among several hydraulic supports based on the support load of the hydraulic support includes: Determine the mapping relationship between the support load and time of the hydraulic support; Based on the mapping relationship between the support load and time, the support load resistance increase rate of the hydraulic support is determined; Based on the support load resistance increase rate of the hydraulic support, determine the average support load resistance increase rate corresponding to several hydraulic supports. Based on the average support load resistance increase rate, a target hydraulic support is determined among several hydraulic supports. The process of controlling the target spray gun to spray protective material onto the risk area of ​​the corresponding panel of the target hydraulic support includes: Determine the reinforcement risk coefficient corresponding to the coal wall; The area to be sprayed for reinforcement is determined based on the reinforcement risk coefficient, the height of the coal wall, and the width of the target hydraulic support. Control the target spray gun to spray the protective material of the sprayed reinforcement area onto the risk area of ​​the corresponding panel of the target hydraulic support; The downward angle of the spray gun, the distance between the spray gun and the coal wall, and the height of the coal wall satisfy the following relationship: ； in, The height of the coal wall, The elevation angle of the spray gun is [value missing]. The angle of depression of the spray gun. The distance between the spray gun and the coal wall.

2. The method for preventing coal wall spalling according to claim 1, characterized in that, The step of determining the load increase rate of the hydraulic support based on the mapping relationship between the support load and time includes: Determine the film support timeline; Based on the time point of the film, a first target time point and a second target time point are determined. The first target time point and the second target time point are less than or equal to the time point of the film, and the first target time point and the second target time point are spaced apart by a preset time. Based on the mapping relationship between the support load and time, determine the first target support load corresponding to the first target time point and the second target support load corresponding to the second target time point; The load increase rate of the hydraulic support is determined based on the first target support load and the second target support load.

3. The method for preventing coal wall spalling according to any one of claims 1 to 2, characterized in that, The protective material meets at least one of the following requirements: The adhesive strength of the protective material is greater than the preset adhesive strength; The tensile strength of the protective material is greater than the preset compressive strength; The elongation rate of the protective material is greater than the preset elongation rate; The protective material is non-flammable; The surface drying time of the protective material is less than the preset time.

4. A coal wall spalling prevention device, characterized in that, include: The acquisition module is used to acquire the support load of the hydraulic support; The first determining module is used to determine a target hydraulic support among a plurality of hydraulic supports based on the support load of the hydraulic support. The second determining module is used to determine the target spray gun that matches the target hydraulic support; The spraying module is used to control the target spray gun to spray protective material onto the risk area of ​​the coal wall corresponding to the target hydraulic support. The protective material is used to improve the compressive and tensile properties of the coal wall. The step of determining a target hydraulic support among several hydraulic supports based on the support load of the hydraulic support includes: Determine the mapping relationship between the support load and time of the hydraulic support; Based on the mapping relationship between the support load and time, the support load resistance increase rate of the hydraulic support is determined; Based on the support load resistance increase rate of the hydraulic support, determine the average support load resistance increase rate corresponding to several hydraulic supports. Based on the average support load resistance increase rate, a target hydraulic support is determined among several hydraulic supports. The process of controlling the target spray gun to spray protective material onto the risk area of ​​the corresponding panel of the target hydraulic support includes: Determine the reinforcement risk coefficient corresponding to the coal wall; The area to be sprayed for reinforcement is determined based on the reinforcement risk coefficient, the height of the coal wall, and the width of the target hydraulic support. Control the target spray gun to spray the protective material of the sprayed reinforcement area onto the risk area of ​​the corresponding panel of the target hydraulic support; The downward angle of the spray gun, the distance between the spray gun and the coal wall, and the height of the coal wall satisfy the following relationship: ； in, The height of the coal wall, The elevation angle of the spray gun is [value missing]. The angle of depression of the spray gun. The distance between the spray gun and the coal wall.

5. An electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the coal wall spalling prevention method as described in any one of claims 1 to 3.

6. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the coal wall spalling prevention method as described in any one of claims 1 to 3.

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