Treatment method and device for roof of fully-mechanized mining face

Abstract

The present application provides a method and device for treating the roof of a fully mechanized coal mining face. The method relates to the field of coal mine safety technology. The method includes: determining the key roof strata of the fully mechanized coal mining face according to the measurement data of the open-off cut of the fully mechanized coal mining face; determining the theoretical first caving interval after the roof ages according to the measurement data; determining the drilling depth and inclination angle of the key roof strata according to the first caving interval and the measurement data; forming drill holes on the key roof strata according to the drilling depth and inclination angle of the key roof strata; controlling a fracturing device to inject fracturing fluid into the drill holes of the key roof strata. By means of injecting fracturing fluid, the problem of controlling the roof at the initial mining of the fully mechanized coal mining face is solved, which has high safety and reliability, so as to ensure the efficient production of coal mine safety, and also has the characteristics of high speed and high efficiency.

Description

Technical Field

[0001] This application relates to the technical field of coal mine safety, and particularly to a method and device for treating the roof of a fully mechanized coal mining face. Background Art

[0002] For a long time, the problem of roof caving in the initial mining of fully mechanized coal mining faces has mainly been solved by explosive blasting. However, the safety accidents caused by explosive blasting exposure cannot be ignored. How to solve the problem of roof caving in the initial mining of fully mechanized coal mining faces has become the focus of research. Summary of the Invention

[0003] The purpose of this application is to solve at least one of the technical problems in the related art to a certain extent.

[0004] To this end, the first purpose of this application is to propose a method for treating the roof of a fully mechanized coal mining face, so as to solve the problem of roof control in the initial mining of fully mechanized coal mining faces by injecting fracturing fluid, which has high safety and reliability, thereby ensuring the efficient production of coal mines, and also having the characteristics of high speed and high efficiency.

[0005] The second purpose of this application is to propose a device for treating the roof of a fully mechanized coal mining face.

[0006] The third purpose of this application is to propose an electronic device.

[0007] The fourth purpose of this application is to propose a computer-readable storage medium.

[0008] The fifth purpose of this application is to propose a computer program product.

[0009] To achieve the above object, the first aspect embodiment of this application proposes a method for treating the roof of a fully mechanized coal mining face, including:

[0010] Determine the key roof strata of the fully mechanized coal mining face according to the measurement data of the open-off cut of the fully mechanized coal mining face;

[0011] Determine the theoretical initial caving step distance after the roof ages according to the measurement data;

[0012] Determine the drilling depth and inclination angle of the key roof strata according to the initial caving step distance and the measurement data;

[0013] Form a borehole on the key roof strata according to the drilling depth and inclination angle of the key roof strata;

[0014] Control the fracturing equipment to inject fracturing fluid into the borehole of the key roof strata.

[0015] To achieve the above object, the second aspect embodiment of this application proposes a device for treating the roof of a fully mechanized coal mining face, including:

[0016] A first determination module, configured to determine a key roof stratum of the fully mechanized coal mining face according to measurement data of the open-off cut of the fully mechanized coal mining face;

[0017] A second determination module, configured to determine a theoretical first caving interval after the roof ages according to the measurement data;

[0018] A third determination module, configured to determine the drilling depth and dip angle of the key roof stratum according to the first caving interval and the measurement data;

[0019] A drilling module, configured to form a drill hole in the key roof stratum according to the drilling depth and dip angle of the key roof stratum;

[0020] A fracturing module, configured to control a fracturing device to inject fracturing fluid into the drill hole of the key roof stratum.

[0021] To achieve the above object, an embodiment of the third aspect of the present application provides an electronic device, including: a processor; and a memory communicatively connected to the processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory, so that the processor can execute the method for processing the roof of the fully mechanized coal mining face according to the embodiment of the first aspect above.

[0022] To achieve the above object, an embodiment of the fourth aspect of the present application provides a computer-readable storage medium, on which a computer program is stored, and the computer instructions are used to cause the computer to execute the method for processing the roof of the fully mechanized coal mining face according to the embodiment of one of the above aspects.

[0023] To achieve the above object, an embodiment of the fifth aspect of the present application provides a computer program product, including a computer program, and when the computer program is executed by a processor, it implements the method for processing the roof of the fully mechanized coal mining face according to the embodiment of one of the above aspects.

[0024] The method and device for processing the roof of the fully mechanized coal mining face provided by the present application determine the theoretical first caving interval after the roof ages through the measurement data of the open-off cut of the fully mechanized coal mining face. Further, according to the first caving interval and the measurement data, the drilling depth and dip angle of the key roof stratum are determined. Based on the determined drilling depth and dip angle, a drill hole is formed in the key roof stratum, and fracturing fluid is injected into the drill hole of the key roof stratum, so that cracks are generated in the key roof stratum under the action of the fracturing fluid, thereby effectively reducing the rock stratum strength and weakening the overall structure, promoting the orderly layered caving of the working face roof, shortening the first caving interval of the working face roof, and thus weakening the pressure of the initial roof weighting of the working face. In the present application, the control problem of the initial roof of the fully mechanized coal mining face is solved by the method of injecting fracturing fluid, which has high safety and reliability, so that the safe and efficient production of coal mines can be guaranteed, and it also has the characteristics of fast and efficient.

[0025] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Description of the Drawings

[0026] The above-mentioned and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description of the embodiments in conjunction with the drawings, wherein:

[0027] Figure 1 is a schematic flow chart of a method for treating the roof of a fully mechanized coal mining face provided by an embodiment of the present application;

[0028] Figure 2 is a schematic diagram of the rock mass structure before the initial caving of the key roof strata provided by an embodiment of the present application;

[0029] Figure 3 is a schematic diagram of the layout of the drilling depth and inclination provided by an embodiment of the present application;

[0030] Figure 4 is a schematic flow chart of another method for treating the roof of a fully mechanized coal mining face provided by an embodiment of the present application;

[0031] Figure 5 is a sectional view of the drilling layout provided by an embodiment of the present application;

[0032] Figure 6 is a schematic structural diagram of a device for treating the roof of a fully mechanized coal mining face provided by an embodiment of the present application. Detailed Embodiments

[0033] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application and should not be construed as limiting the present application.

[0034] The method and device for treating the roof of a fully mechanized coal mining face according to the embodiments of the present application will be described below with reference to the drawings.

[0035] Figure 1 is a schematic flow chart of a method for treating the roof of a fully mechanized coal mining face provided by an embodiment of the present application. As Figure 1 shown, the method for treating the roof of the fully mechanized coal mining face may include but is not limited to the following steps:

[0036] S101. Determine the key roof strata of the fully mechanized coal mining face according to the measurement data of the open-off cut of the fully mechanized coal mining face.

[0037] In some embodiments, the initial cut of the fully mechanized coal mining face can be carried out. Further, based on the geological data of the initial cut, relevant information of the rock strata can be determined, such as lithology, such as sandstone and mudstone, the thickness and specific weight of the rock strata, the elastic modulus of the rock strata, etc.

[0038] In some embodiments, the measurement data of the initial cut may include, but are not limited to, the elastic modulus of different rock strata E (unit: GPa), the thickness of different rock strata h (unit: m), the specific weight of different rock strata γ (unit: kN / m3), the tensile strength of the rock strata R T (unit: MPa).

[0039] In some embodiments, based on the geological data of the initial cut of the fully mechanized coal mining face in the mine and in combination with the borehole columnar diagram, according to the theory of mine pressure and strata control, it can be determined whether the rock strata is the key roof stratum. It should be noted that the borehole columnar diagram can visually show the lithology changes of the rock strata at different depths, and can determine the lithology characteristics and approximate positions of the rock strata.

[0040] In some embodiments, for the m th layer of the fully mechanized coal mining face, according to the measurement data, the first load of the m th layer on the n +1th layer, and the second load of the m th layer on the n th layer are obtained. Further, the first breaking distance of the hard rock of the m th layer, and the second breaking distance of the hard rock of the m th layer adjacent to the m +1th layer are obtained. In response to the first load being less than the second load and the second breaking moment being greater than the first breaking distance, it is determined that the m th layer is the key roof stratum.

[0041] In some embodiments, the following formula (1) can be used to determine the first load ( m ) of the n +1th layer by the q n+1 th layer m :

[0042]

[0043] In some embodiments, the following formula (2) can be used to determine the first breaking distance of the hard rock of the m th layer:

[0044]

[0045] It should be noted thatE n+1 represents the elastic modulus of the n +1-th layer; E m represents the elastic modulus of the m -th layer; h n+1 represents the rock layer thickness of the n +1-th layer; h m represents the rock layer thickness of the m -th layer; γ n+1 represents the rock layer unit weight of the n +1-th layer; γ m represents the rock layer unit weight of the m -th layer; R T represents the tensile strength of the corresponding rock layer; q m represents the load of the m -th layer.

[0046] In response to the first load ( q n+1 ) m being less than the second load ( q n ) m , and the second breaking moment L m+1 being greater than the first breaking distance L m , it is determined that the m -th layer is the key roof layer, that is to say, when the m -th layer satisfies the following formulas (3) and (4), the m -th layer can be identified as the key roof layer.

[0047]

[0048]

[0049] wherein, ( q n ) m represents the second load of the m -th layer on the n -th layer; L m+1 represents the second breaking distance of the m +1-th layer. It can be understood that the determination process of ( q n ) m is the same as that of ( q n+1 ) mThe determination process is similar and will not be elaborated here; L m+1 The determination process of L m is similar to that of

[0050] It should be noted that the m th layer satisfies formula (3), indicating that the hard rock control range of the m th layer reaches the n th layer, that is, the load of the n +1th layer (the first load ( q n+1 )) m is less than the load of the n th layer (the second load ( q n )) m . The m th layer satisfies formula (4), indicating that the breaking distance (the first breaking moment m L m ) of the lower hard rock (the m th layer) is less than the breaking distance (the second breaking moment L m+1 ) of the upper hard rock (the

[0051] +1th layer). It can be understood that the roof key strata of each rock stratum in the fully mechanized coal mining face can be determined in the above manner to determine all the roof key strata in the fully mechanized coal mining face. Optionally, after determining all the roof key strata, the number of key strata in the fully mechanized coal mining face can be determined.

[0052] S102. According to the measurement data, determine the theoretical initial caving step distance after the roof ages.

[0053] In some embodiments, the measurement data of the roof key strata can be determined from the measurement data of the open-off cut. Further, according to the measurement data, the thickness, tensile strength, and overlying rock load of the roof key strata can be determined. According to the thickness, tensile strength, and overlying rock load of the roof key strata, the initial caving step distance can be determined.

[0054] In some embodiments, as Figure 2 shows the rock mass structure form before the initial caving of the roof key strata in the open-off cut of the fully mechanized coal mining face. Before the strata of the aged roof cave in, it is regarded as a rock beam structure with both ends fixed. According to material mechanics, the theoretical ultimate span of the rock beam structure is:

[0055]

[0056] Among them, L is the initial caving step distance corresponding to the roof key strata, with the unit of m; his the thickness of the key roof stratum, with the unit of m; R T is the tensile strength of the key roof stratum, with the unit of MPa; q is the overlying rock load corresponding to the key roof stratum, with the unit of MPa.

[0057] S103. According to the initial caving step distance and measurement data, determine the drilling depth and inclination angle of the key roof stratum.

[0058] In some embodiments, according to the measurement data, determine the vertical distance between the key roof stratum and the roof of the cut-through roadway. Further, based on the trigonometric function relationship, in combination with the vertical distance between the key roof stratum and the roof of the cut-through roadway and the initial caving step distance, determine the drilling depth and inclination angle of the key roof stratum.

[0059] Optionally, the key roof stratum includes two layers, one of which is the main key stratum and the other is the sub-key stratum. Based on the trigonometric function relationship, in combination with the vertical distance and the initial caving step distance, determine the drilling depth and inclination angle of the key roof stratum. The following formula can be used to determine the drilling depth and inclination angle of the key roof stratum:

[0060]

[0061]

[0062]

[0063]

[0064] Such as Figure 3 shows the layout schematic diagram of the drilling depth and inclination angle. Among them, L 1 is the depth of the drilling corresponding to the main key stratum, with the unit of m; h1 is the vertical distance between the main key stratum and the roof of the cut-through roadway, with the unit of m; θ1 is the inclination angle of the drilling corresponding to the main key stratum, with the unit of °; S 2 is the depth of the drilling corresponding to the sub-key stratum, with the unit of m; h2 is the vertical distance between the sub-key stratum and the roof of the cut-through roadway, with the unit of m; θ2 is the inclination angle of the drilling, with the unit of °. S L 2 is the depth of the drilling corresponding to the sub-key stratum P with the unit of m; h2 is the vertical distance between the sub-key stratum and the roof of the cut-through roadway, with the unit of m; θ2 is the inclination angle of the drilling P with the unit of °.

[0065] S104. According to the drilling depth and inclination angle of the key roof stratum, form drill holes on the key roof stratum.

[0066] In some embodiments, according to the drilling layout parameters, that is, the drilling depth and inclination angle, use a drilling rig at the cut-through roadway of the fully-mechanized mining face in the mine to drill a plurality of drill holes with a fixed diameter into the key roof stratum.

[0067] ​In some embodiments, the drilling layout parameters are determined according to the drilling depth and dip angle of the key roof stratum. Further, a drilling task is generated based on the drilling layout parameters, and the drilling task is sent to the drilling equipment to form a borehole in the key roof stratum.

[0068] S105, control the fracturing equipment to inject fracturing fluid into the borehole of the key roof stratum.

[0069] In some embodiments, the fracturing fluid may include, but is not limited to, water-based fracturing fluid, oil-based fracturing fluid, hybrid-based fracturing fluid, etc. The fracturing fluid can be reasonably selected in combination with the geological conditions of the key roof stratum, which can effectively improve the fracturing effect.

[0070] In some embodiments, the fracturing equipment can inject fracturing fluid into the borehole of the key roof stratum to form pressure in the borehole with the fracturing fluid, so that the key roof stratum can generate fracture cracks after the pressure meets certain conditions. As the fracturing equipment continuously injects fracturing fluid into the borehole under high pressure, the fissures can continuously expand around under the drive of high pressure, and then the rock formation can form interconnected quasi-fracture surfaces. By injecting fracturing fluid into the borehole, the rock strength of the key roof stratum can be effectively reduced, and the overall structure can be weakened, promoting the orderly layered caving of the working face roof, shortening the initial caving step distance of the working face roof, and weakening the initial roof weighting intensity of the working face.

[0071] In some embodiments, the fracturing equipment can use clear water as the fracturing fluid and inject it into the borehole of the key roof stratum to form water pressure in the borehole with the clear water. When the water pressure caused by continuous water injection exceeds the fracture pressure of the key roof stratum, the key roof stratum will generate fracture cracks. As the water pump continuously injects clear water under high pressure, it will further promote the fissures to continuously expand around under the drive of high-pressure water, and then the rock formation can form interconnected quasi-fracture surfaces, which not only effectively reduces the rock strength of the key roof stratum, but also weakens the overall structure, promotes the orderly layered caving of the working face roof, shortens the initial caving step distance of the working face roof, and weakens the initial roof weighting intensity of the working face.

[0072] The roof treatment method for the fully mechanized coal mining face provided by the embodiments of the present application determines the theoretical initial caving interval after the roof ages through the measurement data of the open-off cut of the fully mechanized coal mining face. Further, according to the initial caving interval and the measurement data, the drilling depth and dip angle of the key roof strata are determined. Further, based on the determined drilling depth and dip angle, drill holes are formed in the key roof strata, and fracturing fluid is injected into the drill holes of the key roof strata, so that cracks are generated in the key roof strata under the action of the fracturing fluid, thereby effectively reducing the rock strength and weakening the overall structure, promoting the orderly layered caving of the working face roof, shortening the initial caving interval of the working face roof, and thus weakening the intensity of the initial roof weighting in the working face. In the present application, the problem of controlling the initial roof in the fully mechanized coal mining face is solved by the method of injecting fracturing fluid, which has high safety and reliability, so as to ensure the safe and efficient production of coal mines, and has the characteristics of being fast and efficient.

[0073] Figure 4 It is a schematic flow chart of a roof treatment method for a fully mechanized coal mining face provided by an embodiment of the present application. As Figure 4 shown, the roof treatment method for the fully mechanized coal mining face may include but is not limited to the following steps:

[0074] S401, determine the key roof strata of the fully mechanized coal mining face according to the measurement data of the open-off cut of the fully mechanized coal mining face.

[0075] S402, determine the theoretical initial caving interval after the roof ages according to the measurement data.

[0076] S403, determine the drilling depth and dip angle of the key roof strata according to the initial caving interval and the measurement data.

[0077] For the specific implementation manners of steps S401 to S403, reference may be made to the descriptions of steps S101 to S103 in the above embodiments, and the steps are not repeated here.

[0078] S404, determine the fracture propagation radius of the fracturing, and determine the layout interval between the drill holes of adjacent key roof strata according to the fracture propagation radius of the fracturing.

[0079] In some embodiments, the fracture propagation radius of the fracturing can be determined according to the rock mechanical properties, the properties of the fracturing fluid, the working parameters of the fracturing equipment (for example, injection parameters), the in-situ stress conditions, etc.

[0080] Further, according to the fracture propagation radius of the fracturing, determine the layout interval between the drill holes of different key roof strata. That is to say, the drilling layout parameters also include the layout interval. Optionally, a mapping relationship between the fracture propagation radius of the fracturing and the drilling interval is pre-constructed. After obtaining the fracture propagation radius of the fracturing, the mapping relationship can be queried to obtain the drilling interval that has a mapping relationship with the fracture propagation radius of the fracturing as the layout interval between the drill holes of adjacent key roof strata.

[0081] Exemplarily, after the fracturing equipment injects clear water, the hydraulic pressure can cause the fracture crack propagation radius to be approximately (4 - 5) m, and it can be determined that the interval between boreholes can be set to (16 - 20) m based on the fracture crack propagation radius.

[0082] S405. Determine the opening position and orientation of the borehole, and based on the borehole depth, inclination angle, layout interval, as well as the opening position and orientation, determine the borehole layout parameters.

[0083] In some embodiments, the opening position of the borehole can be on the straight line formed by the intersection of the cutting side of the cut-through roadway and the roof.

[0084] In some embodiments, the orientation of the borehole faces the mining direction of the fully mechanized mining face.

[0085] After determining the borehole depth, inclination angle, layout interval, as well as the opening position and orientation, the borehole layout parameters can be determined based on the above parameters.

[0086] That is to say, the borehole layout parameters further include: the opening position and orientation of the borehole, the opening position is on the straight line formed by the intersection of the cutting side of the cut-through roadway and the roof, and the orientation of the borehole faces the mining direction of the fully mechanized mining face.

[0087] S406. Generate a borehole task based on the borehole layout parameters, and send the borehole task to the borehole equipment to form a borehole on the key roof stratum.

[0088] In some embodiments, after determining the borehole layout parameters, a borehole task can be generated based on the borehole layout parameters. To improve the safety of the borehole operation, the borehole task can be sent to the borehole equipment so that the borehole equipment can execute the borehole task on the key roof stratum to form a borehole on the key roof stratum.

[0089] In some embodiments, the key roof stratum includes two layers, namely the main key stratum and the sub-key stratum. The borehole in the main key stratum is called borehole S , and the borehole in the sub-key stratum is called borehole P . Borehole S and borehole P adopt an interval layout method, and the spacing between the two types of boreholes is equal. That is to say, multiple equally spaced boreholes such as S , P , S , P can be formed on the key roof stratum. Optionally, the general borehole diameter is (56 - 60) mm. As Figure 5 shown, Figure 5 is the cross-section of the borehole layout.

[0090] S407. Determine the working parameters of the fracturing equipment based on the rock hardness and the initial caving step distance of the key roof stratum.

[0091] In some embodiments, the working parameters at least include the number of fracturing times, the pump pressure and the flow rate of the water pump.

[0092] In some embodiments, the pump pressure and the flow rate of the water pump can be determined based on the rock formation hardness. For example, the mapping relationship between the rock formation hardness - the pump pressure of the water pump - the flow rate can be determined in advance through experimental data. After determining the rock formation hardness of the current roof key stratum, the mapping relationship can be queried to determine the corresponding pump pressure and flow rate of the water pump as the working parameters of the fracturing equipment. For example, a flow rate of (80 - 150) L / min and a pump pressure of 62 MPa of the water pump can be selected as the working parameters of the fracturing equipment.

[0093] In some embodiments, the number of fracturing times can be determined based on the initial caving step distance. To prevent the overflow of the fracturing fluid in the borehole, a threshold value can be set, and the number of fracturing times can be determined according to the initial caving step distance and the set threshold value. The set threshold value can be the critical distance of the fracturing fluid in the borehole from the borehole mouth.

[0094] In some embodiments, the number of fracturing times can be determined by using the following formula:

[0095] Number of fracturing times n =( L n - a) / b. Wherein, a is the set threshold value, and b is the effective length of one - time fracturing of the fracturing equipment. Wherein, L n is the initial caving step distance of the roof key stratum n of.

[0096] By way of example, the effective length of one - time fracturing is usually 3 m, that is, b = 3. In order to protect the safety and stability of the roof during the coal face mining, it is set that no fracturing is carried out within 10 m from the borehole mouth, that is, a = 10, and the number of fracturing times n =( L n - 10) / 3.

[0097] S408, control the fracturing equipment to inject the fracturing fluid into the borehole of the roof key stratum based on the working parameters in a mode of segmentally retreating from the bottom of the borehole to the borehole mouth.

[0098] In some embodiments, the fracturing equipment can include a high - pressure water injection pump, a fracturing fluid container and a connecting pipe between the water pump and the fracturing fluid container. The fracturing fluid container also has an outlet end, and under the action of the high - pressure water injection pump, the outlet end injects the fracturing fluid into the borehole of the roof key stratum.

[0099] In some embodiments, the fracturing equipment is controlled to inject fracturing fluid into the borehole in a mode of segmentally retreating from the bottom of the borehole towards the borehole mouth, that is, first entering the bottom of the borehole and successively retreating from the bottom of the borehole towards the borehole mouth according to a set step length.

[0100] In some embodiments, the fracturing equipment may inject fracturing fluid into the borehole according to a set number of fracturing times.

[0101] In some embodiments, the high-pressure water injection pump of the pressure equipment may operate according to a set pump pressure and flow rate to inject fracturing fluid into the borehole.

[0102] In some embodiments, the pressure equipment may set a duration to inject fracturing fluid into the borehole. For example, the fracturing equipment may have a continuous water injection time of (15 - 30) min.

[0103] Exemplarily, clear water is used as the fracturing fluid and injected into the key stratum of the roof by a high-pressure water injection pump. Generally, the flow rate of the high-pressure water injection pump is (80 - 150) L / min and the pump pressure is 62 MPa. When the water pressure after continuous injection exceeds the fracture pressure of the key stratum of the roof, the rock formation generates fracture cracks. With the continuous injection of high pressure by the water injection pump, the water pressure rises, prompting the cracks to continuously expand in all directions under the drive of high pressure, forming an interconnected quasi-fracture surface, which can effectively reduce the rock strength of the key stratum of the roof and weaken the overall structure, promote the orderly layered caving of the working face roof, shorten the first caving step distance of the working face roof, and is beneficial to weakening the first weighting intensity of the working face roof.

[0104] In some embodiments, during the process of injecting fracturing fluid into the borehole, the distance between the fracturing fluid in the borehole and the borehole mouth can be determined. By detecting the situation of the fracturing fluid injected into the borehole, the distance between the fracturing fluid in the borehole and the borehole mouth is determined. In response to the distance between the fracturing fluid in the borehole and the borehole mouth reaching the set distance, the fracturing equipment is controlled to end the injection of fracturing fluid into the borehole. During the process of injecting fracturing fluid into the borehole in this application, through the real-time detection of the distance between the fracturing fluid in the borehole and the borehole mouth, the injection state of the fracturing fluid in the borehole can be identified. When the state meets the conditions, the injection can be stopped, which can not only improve the injection accuracy of the fracturing fluid, but also avoid the problems of excessive injection or insufficient injection.

[0105] In some embodiments, during the process of injecting fracturing fluid into a borehole, surface images of the key roof strata can be collected and the states of the surface images can be recognized to determine whether there are fracture cracks on the surface of the key roof strata. When it is determined that there are fracture cracks on the surface of the key roof strata, the fracturing equipment can be controlled to end the fracturing. During the process of injecting fracturing fluid into the borehole in this application, by monitoring the surface of the key roof strata in real time, it is possible to identify whether there are fracture cracks on the surface. After the fracture cracks appear, the further injection of fracturing fluid can be stopped. Similarly, when there are no fracture cracks, the injection can be continued, enabling the fracturing operation to meet the requirements without manual intervention for determination, thereby improving the operation safety.

[0106] The method for treating the roof of a fully mechanized coal mining face provided in the embodiments of this application determines the theoretical initial caving step distance after the roof ages based on the measurement data of the key roof strata in the open-off cut of the fully mechanized coal mining face. Further, based on the initial caving step distance and the measurement data, the borehole depth and inclination angle of the key roof strata are determined. Further, based on the determined borehole depth and inclination angle, boreholes are formed on the key roof strata, and fracturing fluid is injected into the boreholes of the key roof strata so that the key roof strata generate cracks under the action of the fracturing fluid, thereby effectively reducing the rock stratum strength and weakening the overall structure, promoting the orderly layered caving of the working face roof, shortening the initial caving step distance of the working face roof, and weakening the intensity of the initial roof weighting in the working face.

[0107] In this application, the problem of controlling the initial roof in a fully mechanized coal mining face is solved by the method of injecting fracturing fluid, which has high safety and reliability. Thus, it can ensure the safe and efficient production of coal mines, and at the same time has the characteristics of being fast and efficient.

[0108] Figure 6 It is a schematic structural diagram of a device for treating the roof of a fully mechanized coal mining face provided in the embodiments of this application. As Figure 6 shown, the device 600 for treating the roof of the fully mechanized coal mining face includes: a first determination module 601, a second determination module 602, a third determination module 603, a borehole module 604, and a fracturing module 605.

[0109] The first determination module 601 is configured to determine the key roof strata of the fully mechanized coal mining face according to the measurement data of the open-off cut of the fully mechanized coal mining face;

[0110] The second determination module 602 is configured to determine the theoretical initial caving step distance after the roof ages according to the measurement data;

[0111] The third determination module 603 is configured to determine the borehole depth and inclination angle of the key roof strata according to the initial caving step distance and the measurement data;

[0112] The borehole module 604 is configured to form boreholes on the key roof strata according to the borehole depth and inclination angle of the key roof strata;

[0113] The fracturing module 605 is used to control the fracturing equipment to inject fracturing fluid into the boreholes of the key roof strata.

[0114] In some embodiments, the second determination module 602 is further configured to:

[0115] Determine the thickness, tensile strength, and overlying rock load of the key roof strata according to the measurement data;

[0116] Determine the initial caving step distance according to the thickness, tensile strength, and overlying rock load of the key roof strata.

[0117] In some embodiments, the third determination module 603 is further configured to:

[0118] Determine the vertical distance between the key roof strata and the roof of the cut-through according to the measurement data;

[0119] Based on the trigonometric function relationship, in combination with the vertical distance and the initial caving step distance, determine the borehole depth and inclination angle of the key roof strata.

[0120] In some embodiments, the borehole module 604 is further configured to:

[0121] Determine the borehole layout parameters according to the borehole depth and inclination angle of the key roof strata;

[0122] Generate a borehole task based on the borehole layout parameters and send the borehole task to the borehole equipment to form boreholes on the key roof strata.

[0123] In some embodiments, the borehole module 604 is further configured to:

[0124] Determine the fracturing crack propagation radius;

[0125] Determine the layout interval between the boreholes of adjacent key roof strata according to the fracturing crack propagation radius, and the borehole layout parameters further include the layout interval.

[0126] In some embodiments, the borehole layout parameters further include: the opening position and azimuth of the borehole, the opening position is on the straight line formed by the intersection of the cutting side and the roof, and the azimuth of the borehole faces the mining direction of the fully mechanized coal face.

[0127] In some embodiments, the first determination module 601:

[0128] For the m th layer of the fully mechanized coal face, according to the measurement data, obtain the first load of the m th layer on the n +1th layer, and the second load of the m th layer on the n th layer;

[0129] Obtain them The first breaking distance of the hard rock of the layer, and the m layer adjacent to the m (n + 1)-th layer of the second breaking distance of the hard rock;

[0130] In response to the first load being less than the second load, and the second breaking moment being greater than the first breaking distance, it is determined that the m layer is the key roof stratum.

[0131] In some embodiments, the fracturing module 605 is further configured to:

[0132] Based on the rock hardness and the initial caving interval of the key roof stratum, determine the working parameters of the fracturing equipment, where the working parameters at least include the number of fracturing times, the pump pressure and the flow rate of the water pump;

[0133] Control the fracturing equipment to inject fracturing fluid into the borehole of the key roof stratum in a mode of segmentally retreating from the bottom of the borehole to the borehole mouth based on the working parameters.

[0134] In some embodiments, the fracturing module 605 is further configured to:

[0135] During the process of injecting fracturing fluid into the borehole, determine the distance between the fracturing fluid in the borehole and the borehole mouth;

[0136] In response to the distance between the fracturing fluid in the borehole and the borehole mouth reaching the set distance, control the fracturing equipment to end injecting fracturing fluid into the borehole.

[0137] The device for treating the roof of the fully mechanized coal mining face provided by the embodiments of the present application determines the theoretical initial caving interval after the roof ages through the measurement data of the key roof stratum of the open-off cut of the fully mechanized coal mining face. Further, according to the initial caving interval and the measurement data, determine the borehole depth and inclination angle of the key roof stratum. Further, based on the determined borehole depth and inclination angle, form a borehole on the key roof stratum, and inject fracturing fluid into the borehole of the key roof stratum, so that cracks are generated in the key roof stratum under the action of the fracturing fluid, thereby effectively reducing the rock stratum strength and weakening the overall structure, promoting the orderly layered caving of the working face roof, shortening the initial caving interval of the working face, and weakening the roof weighting intensity during the initial mining of the working face. In the present application, the problem of controlling the initial mining roof of the fully mechanized coal mining face is solved by the way of injecting fracturing fluid, which has high safety and reliability, so as to ensure the safe and efficient production of coal mines, and has the characteristics of high speed and high efficiency.

[0138] To implement the above embodiments, the present application also proposes an electronic device, including: a processor, and a memory communicatively connected to the processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory to implement the method provided by the foregoing embodiments.

[0139] To implement the above embodiments, the present application also provides a computer-readable storage medium storing computer-executable instructions, which are used to implement the method provided by the foregoing embodiments when executed by a processor.

[0140] To implement the above embodiments, the present application also provides a computer program product including a computer program, which implements the method provided by the foregoing embodiments when executed by a processor.

[0141] The collection, storage, use, processing, transmission, provision, and application of the user's personal information involved in the present application all comply with the provisions of relevant laws and regulations and do not violate public order and good customs.

[0142] It should be noted that personal information from users should be collected for legal and reasonable purposes and should not be shared or sold outside of these legitimate uses. In addition, such collection / sharing should be carried out after obtaining the informed consent of the user, including but not limited to notifying the user to read the user agreement / user notice and signing an agreement / authorization including authorizing relevant user information before the user uses the function. In addition, any necessary steps should be taken to protect and safeguard access to such personal information data and ensure that others with access to the personal information data comply with their privacy policies and procedures.

[0143] The present application is expected to provide an implementation for users to selectively block the use or access of personal information data. That is, the present application is expected to provide hardware and / or software to prevent or block access to such personal information data. Once the personal information data is no longer needed, the risk can be minimized by restricting data collection and deleting the data. In addition, when applicable, personal identifiers are removed from such personal information to protect the privacy of the user.

[0144] In the description of the foregoing embodiments, the descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0145] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features indicated. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of this application, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0146] Any process or method description represented in a flowchart or described otherwise herein may be understood to represent a module, segment, or portion of code including one or more executable instructions for implementing a customized logical function or process, and the scope of the preferred embodiments of this application includes additional implementations, where functions may be executed not in the order shown or discussed, including in a substantially simultaneous manner according to the functions involved or in a reverse order, which should be understood by those skilled in the technical field to which the embodiments of this application pertain.

[0147] The logic and / or steps represented in a flowchart or described otherwise herein, for example, may be considered a sequenced list of executable instructions for implementing a logical function and may be embodied specifically in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, a system including a processor, or other systems that can fetch and execute instructions from the instruction execution system, apparatus, or device. As used in this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium include the following: an electrical connection portion having one or more wirings (electronic device), a portable computer diskette (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can even be paper or other suitable medium on which the program can be printed, as the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpretation, or other appropriate processing as necessary, and then stored in a computer memory.

[0148] It should be understood that each part of the present application can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, any one of the following techniques known in the art or a combination thereof can be used: discrete logic circuits having logic gate circuits for implementing logical functions on data signals, application specific integrated circuits having appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

[0149] Those of ordinary skill in the art can understand that all or part of the steps carried by the method of implementing the above embodiments can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiments.

[0150] In addition, in each embodiment of the present application, each functional unit can be integrated into a processing module, or each unit can exist physically alone, or two or more units can be integrated into one module. The above integrated module can be implemented in the form of hardware or in the form of a software functional module. When the above integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0151] The above-mentioned storage medium can be a read-only memory, a magnetic disk, an optical disc, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A method for treating the roof of a fully mechanized coal mining face, characterized in that, The method includes: Determining the key roof strata of the fully mechanized coal mining face according to the measurement data of the open-off cut of the fully mechanized coal mining face; wherein, the key roof strata include the main key stratum and the sub-key stratum; Determining the theoretical initial caving interval after the roof ages according to the measurement data; Determining the vertical distance between the key roof strata and the roof of the open-off cut according to the measurement data; Based on the trigonometric function relationship, combining the vertical distance and the initial caving interval, determining the drilling depth and inclination angle of the key roof strata: Wherein, L1 is the depth of the borehole S corresponding to the main key stratum, h1 is the vertical distance between the main key stratum and the roof of the open-off cut, θ1 is the inclination angle of the borehole S corresponding to the main key stratum, L2 is the depth of the borehole P corresponding to the sub-key stratum, h2 is the vertical distance between the sub-key stratum and the roof of the open-off cut, and θ2 is the inclination angle of the borehole P; Forming a borehole on the key roof strata according to the drilling depth and inclination angle of the key roof strata; Controlling the fracturing equipment to inject fracturing fluid into the borehole of the key roof strata; The determining the key roof strata of the fully mechanized coal mining face according to the measurement data of the open-off cut of the fully mechanized coal mining face includes: For the m th layer of the fully mechanized coal mining face, according to the measurement data, obtain the first load of the m th layer on the n +1th layer, and the second load of the m th layer on the n th layer; Use the following formula to determine the first load of the mth layer on the n+1th layer: Among them, (q n+1 ) m represents the first load of the m-th layer on the (n + 1)-th layer, E n+1 represents the elastic modulus of the (n + 1)-th layer; E m represents the elastic modulus of the m-th layer; h n+1 represents the rock formation thickness of the (n + 1)-th layer; h m represents the rock formation thickness of the m-th layer; γ n+1 represents the rock formation unit weight of the (n + 1)-th layer; γ m represents the rock formation unit weight of the m-th layer; Obtain the first breaking distance of the hard rock of the m th layer, and the second breaking distance of the hard rock of the m th layer adjacent to the m th + 1 layer; Use the following formula to determine the first breaking distance of the hard rock of the mth layer: Among them, L m represents the first breaking distance of the hard rock in the m-th layer, and R T represents the tensile strength of the corresponding rock stratum; q m represents the load of the m-th layer; Determine that the m layer is the key roof layer in response to the first load being less than the second load and the second breaking moment being greater than the first breaking distance, that is Among them, (q n ) m represents the second load of the m-th layer on the n-th layer; L m+1 represents the second breaking distance of the (m + 1)-th layer.

2. The method according to claim 1, wherein The determining the theoretical initial caving interval after the roof ages according to the measurement data includes: Determining the thickness, tensile strength and overlying rock load of the key roof strata according to the measurement data; Determining the initial caving interval according to the thickness, tensile strength and overlying rock load of the key roof strata.

3. The method according to claim 1, characterized in that, The forming a borehole on the key roof strata according to the drilling depth and inclination angle of the key roof strata includes: Determining the borehole layout parameters according to the drilling depth and inclination angle of the key roof strata; Generating a borehole task based on the borehole layout parameters and sending the borehole task to the borehole equipment to form a borehole on the key roof strata.

4. The method according to claim 3, wherein The determining the borehole layout parameters according to the drilling depth and inclination angle of the key roof strata includes: Determining the fracture propagation radius of the fracturing; Determining the layout interval between the boreholes of adjacent key roof strata according to the fracture propagation radius of the fracturing, and the borehole layout parameters further include the layout interval.

5. The method according to claim 3, characterized in that, The borehole layout parameters further include: the opening position and azimuth of the borehole, the opening position is on the straight line formed by the intersection of the rib of the open-off cut and the roof, and the azimuth of the borehole faces the mining direction of the fully mechanized coal mining face.

6. The method according to any one of claims 1-5, characterized in that, The controlling the fracturing equipment to inject fracturing fluid into the borehole of the key roof strata includes: Determining the working parameters of the fracturing equipment based on the rock hardness of the key roof strata and the initial caving interval, wherein the working parameters at least include the number of fracturing times, the pump pressure and the flow rate of the water pump; Controlling the fracturing equipment to inject fracturing fluid into the borehole of the key roof strata in a mode of retreating in sections from the bottom of the borehole to the borehole mouth based on the working parameters.

7. The method according to claim 6, characterized in that, The method further includes: During the process of injecting fracturing fluid into the borehole, determining the distance between the fracturing fluid in the borehole and the borehole mouth; In response to the distance between the fracturing fluid in the borehole and the borehole mouth reaching the set distance, controlling the fracturing equipment to end injecting fracturing fluid into the borehole.

8. A device for treating the roof of a fully-mechanized mining face, characterized in that, The device is used to implement the method as claimed in claim 1, and the device includes: A first determination module, configured to determine a roof key stratum of the fully-mechanized mining face according to measurement data of the open-off cut of the fully-mechanized mining face; wherein, the roof key stratum includes a main key stratum and a sub-key stratum; A second determination module, configured to determine a theoretical first caving interval after the roof ages according to the measurement data; A third determination module, configured to determine the drilling depth and dip angle of the roof key stratum according to the first caving interval and the measurement data; A drilling module, configured to form a drill hole on the roof key stratum according to the drilling depth and dip angle of the roof key stratum; A fracturing module, configured to control a fracturing device to inject fracturing fluid into the drill hole of the roof key stratum; The first determination module is specifically configured to, for the m th layer of the fully-mechanized coal mining face, obtain, according to the measurement data, the first load of the m th layer on the n th + 1 layer, and the second load of the m th layer on the n th layer; Obtain the first breaking distance of the hard rock of the m layer, and the second breaking distance of the hard rock of the m layer adjacent to the m +1 layer; Determine that the m layer is the key roof stratum in response to the first load being less than the second load and the second breaking moment being greater than the first breaking distance.

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