Coal mine roof fracture position positioning method based on distributed optical fibers

Abstract

The invention provides a coal mine roof fracture position positioning method based on a distributed optical fiber, and the method comprises the steps: recording the vibration waveform of each vibration induction point on a distributed DAS optical cable through a distributed DAS vibration collection system after a coal mine roof corresponding to a coal mining working face is fractured, and the distributed DAS optical cable comprises an upper ground surface of the coal mining working face and a lower ground surface of the coal mining working face; the first DAS optical cable and the second DAS optical cable are arranged in the inclined direction of the coal face and the trend direction of the coal face respectively and intersect perpendicularly, the third DAS optical cable is arranged in a coal pillar area on the solid coal side and intersects with the first DAS optical cable perpendicularly, and the vibration waveform arrival time of each vibration sensing point on each DAS optical cable is sequenced in sequence. Constructing three corresponding normal planes; and taking the spatial intersection point of the three normal planes as the fracture position of the coal mine roof. Therefore, the high-precision position of the fracture point of the coal mine roof is obtained by using the principle of the normal plane intersection point of the three optical cables, and the seismic source positioning precision is improved.

Description

Technical Field

[0001] The present invention relates to the field of coal mine safety technology, and in particular to a method, device, electronic equipment and storage meson for locating a coal mine roof rupture position based on distributed optical fiber. Background Art

[0002] The location of coal mine roof rupture is one of the important guarantees for mine safety production. In the related technology, the roof rupture signal is obtained through the detector of the traditional coal mine microseismic monitoring system for judgment. However, due to installation, maintenance and cost issues, the number of traditional detector measurement points is limited, and it is easy to be affected by electromagnetic interference in the underground environment of coal mines. At the same time, the transmission line is long, resulting in huge maintenance. Therefore, the current traditional coal mine microseismic monitoring system has poor source positioning accuracy and cannot meet the needs of coal mine production. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, the first purpose of the present invention is to propose a method for locating the rupture position of the coal mine roof based on distributed optical fiber, using the principle of the intersection of the normal planes of three optical cables to obtain the high-precision position of the rupture point of the coal mine roof and improve the accuracy of earthquake source positioning.

[0005] The second object of the present invention is to provide a device for locating the fracture position of a coal mine roof based on distributed optical fiber.

[0006] A third objective of the present invention is to provide an electronic device.

[0007] A fourth object of the present invention is to provide a non-transitory computer-readable storage medium storing computer instructions.

[0008] To achieve the above-mentioned purpose, the first embodiment of the present invention proposes a method for locating the fracture position of a coal mine roof based on distributed optical fiber, the method comprising:

[0009] After the coal mine roof rupture occurs at the coal mining face, the vibration wave propagates outward, and the vibration waveform of each vibration sensing point on the distributed DAS optical cable is recorded by the distributed DAS vibration acquisition system, wherein the distributed DAS optical cable includes two vertically intersecting first DAS optical cables and second DAS optical cables arranged on the surface above the coal mining face along the inclination direction and the strike direction of the coal mining face, respectively, and a third DAS optical cable vertically intersecting the first DAS optical cable in the coal pillar area on the physical coal side of the coal mining face;

[0010] Constructing a first normal plane of the first DAS optical cable according to the order of arrival of the vibration waveform of each vibration sensing point on the first DAS optical cable;

[0011] Constructing a second normal plane of the second DAS optical cable according to the order of arrival of the vibration waveform of each vibration sensing point on the second DAS optical cable;

[0012] Constructing a third normal plane of the third DAS optical cable according to the order of arrival of the vibration waveform of each vibration sensing point on the third DAS optical cable;

[0013] The first normal plane, the second normal plane, and the third normal plane are mutually perpendicular, and have only one spatial intersection point, and the spatial intersection point is used as the coal mine roof fracture position. To achieve the above purpose, the second aspect of the present invention proposes a coal mine roof fracture position positioning device based on distributed optical fiber, and the device includes:

[0014] A recording module is used for recording the vibration waveform of each vibration sensing point on the distributed DAS optical cable through a distributed DAS vibration collection system after the coal mine roof rupture occurs at the coal mining face and the vibration wave propagates outward, wherein the distributed DAS optical cable includes two vertically intersecting first DAS optical cables and second DAS optical cables arranged on the surface above the coal mining face along the inclination direction of the coal mining face and the strike direction of the coal mining face, respectively, and a third DAS optical cable vertically intersecting the first DAS optical cable in the coal pillar area on the side of the coal mining face corresponding to the physical coal;

[0015] A first construction module, configured to construct a first normal plane of the first DAS optical cable according to the order of arrival of the vibration waveform of each vibration sensing point on the first DAS optical cable;

[0016] A second construction module, configured to construct a second normal plane of the second DAS optical cable according to the order of arrival of the vibration waveform of each vibration sensing point on the second DAS optical cable;

[0017] A third construction module, configured to construct a third normal plane of the third DAS optical cable according to the order of arrival of the vibration waveform of each vibration sensing point on the third DAS optical cable;

[0018] A determination module is provided for determining that the first normal plane, the second normal plane and the third normal plane are mutually perpendicular and have only one spatial intersection point, and the spatial intersection point is used as the fracture position of the coal mine roof.

[0019] To achieve the above-mentioned purpose, the third aspect of the present invention proposes an electronic device, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method described in the first aspect.

[0020] In order to achieve the above-mentioned purpose, the fourth aspect of the present invention proposes a non-transitory computer-readable storage medium storing computer instructions, where the computer instructions are used to enable the computer to execute the method described in the first aspect.

[0021] The distributed optical fiber-based coal mine roof rupture location positioning method, device, electronic device and storage medium of the embodiment of the present invention, after the coal mine roof rupture occurs at the coal mining face, the distributed DAS vibration acquisition system records the vibration waveform of each vibration sensing point on the distributed DAS optical cable, and the distributed DAS optical cable includes two vertically intersecting first DAS optical cables and second DAS optical cables arranged along the inclination direction and the strike direction of the coal mining face on the surface above the coal mining face, and a third DAS optical cable vertically intersecting the first DAS optical cable in the coal pillar area on the side of the solid coal, and the vibration waveform of each vibration sensing point on each DAS optical cable is sequentially arranged in time to construct three corresponding normal planes; the spatial intersection of the three normal planes is used as the coal mine roof rupture position. Thus, the high-precision coal mine roof rupture point position is obtained by using the principle of the intersection of the normal planes of the three optical cables, and the earthquake source positioning accuracy is improved.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0024] Figure 1 A schematic flow chart of a method for locating a coal mine roof rupture position based on distributed optical fiber provided in an embodiment of the present invention;

[0025] Figure 2 A network layout diagram of a distributed DAS optical cable provided by an embodiment of the present invention;

[0026] Figure 3 An example diagram of a DAS optical cable arrangement solution provided by an embodiment of the present invention;

[0027] Figure 4 An example diagram of constructing a normal plane provided by an embodiment of the present invention;

[0028] Figure 5 A vibration sensing point determination stereogram provided by an embodiment of the present invention;

[0029] Figure 6 A schematic structural diagram of a device for locating a coal mine roof rupture position based on distributed optical fiber provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0031] It should be noted that the acquisition, storage, use, and processing of data in the technical solution of this application comply with the relevant provisions of relevant laws and regulations.

[0032] The following describes a method and device for locating a coal mine roof rupture position based on distributed optical fiber according to an embodiment of the present invention with reference to the accompanying drawings.

[0033] Figure 1 A schematic flow chart of a method for locating a coal mine roof rupture position based on distributed optical fiber provided in an embodiment of the present invention.

[0034] like Figure 1 As shown, the method comprises the following steps:

[0035] Step 101, after the coal mine roof corresponding to the coal mining working face breaks, the vibration wave propagates outward, and the vibration waveform of each vibration sensing point on the distributed DAS optical cable is recorded by the distributed DAS vibration collection system, wherein the distributed DAS optical cable includes two vertically intersecting first DAS optical cables and second DAS optical cables arranged on the surface above the coal mining working face along the inclination direction and the strike direction of the coal mining working face respectively, and a third DAS optical cable vertically intersecting the first DAS optical cable in the coal pillar area on the physical coal side of the coal mining working face.

[0036] The distributed DAS vibration acquisition system is a technology that uses optical cables as sensing media to continuously monitor vibration signals distributed along the optical cables. When the optical cable is subjected to dynamic strain such as external sound waves, the phase and other characteristics of the light transmitted in the optical cable will change. This change can be extracted and converted into a corresponding vibration signal through coherent detection and other means, thereby realizing the perception of the vibration sensing point and determining its specific position on the optical cable.

[0037] In some embodiments, the first DAS optical cable is arranged starting from a preset first distance threshold behind the cut-off point of the coal mining face, and a first DAS optical cable is arranged every second distance threshold, and in the inclination direction of the coal mining face, the length of the first DAS optical cable covers the inclination length of the coal mining face, and extends the inclination length of at least one adjacent coal mining face, wherein the second distance threshold is greater than the first distance threshold; the second DAS optical cable is arranged starting from a preset first distance threshold behind the cut-off point of the coal mining face, and is arranged all the way to the first distance threshold outside the corresponding stop mining line of the coal mining face, and is located at the midpoint of the coal mining face in the inclination direction of the coal mining face.

[0038] Optionally, in the coal pillar area corresponding to the solid coal side of the coal mining working face, a vertical borehole is constructed downward from the surface, the depth of the vertical borehole is the depth of the coal seam, and a DAS optical cable is arranged in the vertical hole to obtain a third DAS optical cable.

[0039] Further, the third DAS optical cable intersects the first DAS optical cable perpendicularly, and the distance between each third DAS optical cable is a second distance threshold.

[0040] Among them, on the surface above the coal mining working face, the vertically intersecting first DAS optical cable and the second DAS optical cable can be arranged in a buried manner, but it is not limited to this.

[0041] Specifically, the first distance threshold may be 100m, and the second distance threshold may be 1000m. For example, Figure 2 As shown in the figure, two vertically intersecting first DAS optical cables (ground optical cable X) and second DAS optical cables (ground optical cable Y) are arranged along the inclination direction (X) and the strike direction (Y) of the coal mining face respectively, and a third DAS optical cable (well optical cable Z) vertically intersecting the ground optical cable X in the coal pillar area on the solid coal side of the advanced tunnel of the coal mining face; the ground optical cable X is arranged from the preset 100m behind the cut-off (starting line) of the coal mining face, and a ground optical cable X is arranged every 1000m; the ground optical cable Y is arranged from the preset 100m behind the cut-off of the coal mining face, and is arranged to 1000m outside the corresponding stop line of the coal mining face.

[0042] It can be understood that, in the coal pillar area on the physical coal side, the third DAS optical cable intersects the first DAS optical cable vertically, so the distance between each third DAS optical cable is also 1000m.

[0043] In order to better understand the network layout diagram of the distributed DAS optical cable, the embodiment of the present invention also provides an example diagram of the DAS optical cable layout scheme, such as Figure 3As shown in the figure, in a coal mine including goaf, advanced tunnel, working face a and working face b adjacent to working face a, the coal mining working face (working face a) has a dip length of 300m and a strike length of 2000m ( Figure 3 Only a range of 1000m is selected for illustration). Ground optical cable X (first DAS optical cable) and ground optical cable Y (second DAS optical cable) are arranged on the surface above working face a, and ground optical cable X is laid along the inclination direction of working face a. Since the coal mine roof rupture event (seismic source sensing point S) not only occurs inside working face a, but also outside working face a, the laying range of ground optical cable X is 300m from the upper extension of working face a to 300m from the lower extension of adjacent working face b. Ground optical cable Y is laid along the strike direction of working face a, located at the midpoint of working face a in the inclination direction, and the laying range is 100m from the cut-eye extension of working face a to 100m from the stop-mining line extension.

[0044] On the surface above the coal pillar of working face a, a borehole is vertically constructed underground until it reaches the coal seam layer, and then an optical cable Z (third DAS optical cable) is laid in the borehole, which intersects the ground optical cable X vertically.

[0045] Step 102 , constructing a first normal plane of the first DAS optical cable according to the order of arrival of the vibration waveform of each vibration sensing point on the first DAS optical cable.

[0046] In some embodiments, each point on the first DAS optical cable can be regarded as a vibration sensing point. When the optical cable gauge is infinitely small, the first normal plane of the first optical cable can be uniquely determined for each crack in the coal mine roof, so that each point in the first normal plane satisfies the P wave (vibration waveform) arrival time order, that is, each point in the first normal plane is a vibration sensing point. Therefore, accurate monitoring of the earthquake source point is achieved through the precise and rapid construction of the first normal plane.

[0047] Specifically, Figure 4As shown, there are 6 vibration sensing points on the first DAS optical cable, the source sensing point S breaks, and the vibration waveform propagates to the 6 vibration sensing points in sequence. The order in which the 6 vibration sensing points are excited is 3>4>2>5>6>1, and the greater than sign indicates earlier than. The order of excitation can be used to determine two normal planes L1 and L2 perpendicular to the first DAS optical cable. The intersection of the normal plane L1 and the first DAS optical cable is the No. 3 sensing point that first receives the vibration waveform, and the intersection of the normal plane L2 and the first DAS optical cable is the midpoint between the No. 3 sensing point and the No. 4 sensing point that receives the vibration waveform second. It can be seen that all points between the normal plane L1 and the normal plane L2 meet the above excitation order, so they may all be source sensing points. All source sensing points above the normal plane L1 and below the normal plane L2 can be ruled out as source sensing points. The gauge length of the first DAS optical cable is set to 0.1m, that is, there is a seismic source sensing point every 0.1m on the first DAS optical cable, and the vertical distance between the normal plane L1 and the normal plane L2 is only 0.05m. Compared with the scale of the coal mine working face of several thousand meters, the thickness of 0.05m can be completely regarded as a plane, and this plane becomes the first normal plane of the first DAS optical cable.

[0048] Step 103 , constructing a second normal plane of the second DAS optical cable according to the order of arrival of the vibration waveform of each vibration sensing point on the second DAS optical cable.

[0049] In some embodiments, each point on the second DAS optical cable can be regarded as a vibration sensing point. When the optical cable gauge is infinitely small, the second normal plane of the second optical cable can be uniquely determined for each crack in the coal mine roof, so that each point in the second normal plane satisfies the P wave (vibration waveform) arrival time order, that is, each point in the second normal plane is a vibration sensing point. Therefore, accurate monitoring of the earthquake source point is achieved through the precise and rapid construction of the second normal plane.

[0050] Among them, the construction method of the second normal plane can also be as follows Figure 4 As shown, the construction method is the same as the first normal plane.

[0051] Step 104 , constructing a third normal plane of the third DAS optical cable according to the order of arrival of the vibration waveform of each vibration sensing point on the third DAS optical cable.

[0052] In some embodiments, each point on the third DAS optical cable can be regarded as a vibration sensing point. When the optical cable gauge is infinitely small, the third normal plane of the third optical cable can be uniquely determined for each crack in the coal mine roof, so that each point in the third normal plane satisfies the P wave (vibration waveform) arrival time order, that is, each point in the third normal plane is a vibration sensing point. Therefore, accurate monitoring of the earthquake source point is achieved through the precise and rapid construction of the third normal plane.

[0053] Among them, the third normal plane can be constructed as follows Figure 4 As shown, the construction method is the same as the first normal plane.

[0054] Step 105: The first normal plane, the second normal plane, and the third normal plane are perpendicular to each other, and have only one spatial intersection point. The spatial intersection point is used as the fracture position of the coal mine roof.

[0055] In some embodiments, the first normal plane, the second normal plane, and the third normal plane are perpendicular to each other, and there is only one spatial intersection. An implementation method of using the spatial intersection as the location of the coal mine roof rupture can be that the first normal plane, the second normal plane, and the third normal plane are perpendicular to each other. When the first normal plane is α1x+b1y+c1z+d1=0, the second normal plane is α2x+b2y+c2z+d2=0, and the third normal plane is α3x+b3y+c3z+d3=0; c z+d1=0、α2x+b2y+c2z+d2=0、α3x+b3y+c3z+d3=0, to form a three-variable linear equation system A, and transform the three-variable linear equation system into a matrix form AX=B, to solve the three-variable linear equation system X=(A -1 )B; wherein, det(A)≠0; the solution of the three-variable linear equation system X=(A -1 )B is used as the spatial intersection of the first normal plane, the second normal plane, and the third normal plane, and the spatial intersection is used as the fracture position of the coal mine roof. Thus, the accurate solution of the fracture position of the coal mine roof is achieved.

[0056] Specifically, Figure 5As shown in the figure, in a coal mine including goaf, advanced tunnel, working face a and working face b adjacent to working face a, the vibration sensing point S is broken, and the vibration waveform (P wave) excites all the source sensing points on three spatially orthogonal optical cables (first DAS optical cable, second DAS optical cable, and third DAS optical cable). The source sensing points on each DAS optical cable can obtain the P wave excitation sequence (sequentially sorted at that time). The P wave excitation sequence can be obtained through the source sensing points on the ground optical cable X (first DAS optical cable), and the first normal plane I can be obtained. The P wave excitation sequence can be obtained through the source sensing points on the ground optical cable Y (second DAS optical cable), and the second normal plane II can be obtained. The P wave excitation sequence can be obtained through the source sensing points on the well optical cable Z (third DAS optical cable), and the third normal plane III can be obtained. Plane I and plane II intersect at the straight line EF, plane I and plane III intersect at the straight line CD, and plane III and plane II intersect at the straight line AB. The straight lines AB, CD and EF in space intersect at a point S, which is the final vibration sensing point. By solving the three-variable linear equation system, the coordinates of the vibration sensing point can be obtained, which is the coordinates of point S. x ,S y ,S z .

[0057] The distributed optical fiber-based method for locating the rupture position of the coal mine roof in the embodiment of the present invention records the vibration waveform of each vibration sensing point on the distributed DAS optical cable through the distributed DAS vibration acquisition system after the coal mining working face corresponds to the rupture of the coal mine roof. The distributed DAS optical cable includes two vertically intersecting first DAS optical cables and second DAS optical cables arranged along the inclination direction and the strike direction of the coal mining working face on the surface above the coal mining working face, and a third DAS optical cable vertically intersecting the first DAS optical cable in the coal pillar area on the side of the solid coal. The vibration waveforms of each vibration sensing point on each DAS optical cable are sequentially arranged in time to construct three corresponding normal planes; the spatial intersection of the three normal planes is used as the rupture position of the coal mine roof. Thus, the high-precision position of the rupture point of the coal mine roof is obtained by using the principle of the intersection of the normal planes of the three optical cables, thereby improving the accuracy of the earthquake source positioning.

[0058] In order to implement the above-mentioned embodiment, the present invention further proposes a device for locating the fracture position of a coal mine roof based on distributed optical fiber.

[0059] Figure 6 A schematic structural diagram of a device for locating a coal mine roof rupture position based on distributed optical fiber provided in an embodiment of the present invention.

[0060] like Figure 6 As shown, the distributed optical fiber-based coal mine roof rupture position positioning device 60 includes a recording module 61 , a first building module 62 , a second building module 63 , a third building module 64 , and a determination module 65 .

[0061] The recording module 61 is used for recording the vibration waveform of each vibration sensing point on the distributed DAS optical cable through the distributed DAS vibration collection system after the coal mine roof rupture occurs at the coal mining face and the vibration wave propagates outward, wherein the distributed DAS optical cable includes two vertically intersecting first DAS optical cables and second DAS optical cables arranged on the surface above the coal mining face along the inclination direction of the coal mining face and the strike direction of the coal mining face, respectively, and a third DAS optical cable vertically intersecting the first DAS optical cable in the coal pillar area on the side of the coal mining face corresponding to the physical coal;

[0062] A first constructing module 62, configured to construct a first normal plane of the first DAS optical cable according to the order of arrival of the vibration waveform of each vibration sensing point on the first DAS optical cable;

[0063] A second construction module 63, configured to construct a second normal plane of the second DAS optical cable according to the order of arrival of the vibration waveform of each vibration sensing point on the second DAS optical cable;

[0064] A third construction module 64 is used to construct a third normal plane of the third DAS optical cable according to the order of arrival of the vibration waveform of each vibration sensing point on the third DAS optical cable;

[0065] Determine module 65, for the first normal plane, the second normal plane, and the third normal plane to be mutually perpendicular, and have only one spatial intersection point, and use the spatial intersection point as the coal mine roof fracture position

[0066] Further, in a possible implementation of the embodiment of the present invention, the first DAS optical cable is arranged starting from a preset first distance threshold behind the cut-eye of the coal mining face, and a first DAS optical cable is arranged every second distance threshold, and in the inclination direction of the coal mining face, the length of the first DAS optical cable covers the inclination length of the coal mining face and extends to the inclination length of at least one adjacent coal mining face, wherein the second distance threshold is greater than the first distance threshold;

[0067] The second DAS optical cable is arranged from the preset first distance threshold behind the cut eye of the coal mining face, and is arranged to the first distance threshold outside the corresponding stop mining line of the coal mining face, and is located at the midpoint of the coal mining face in the inclination direction of the coal mining face.

[0068] Furthermore, in a possible implementation of the embodiment of the present invention, the laying method of the third DAS optical cable includes:

[0069] In the coal pillar area corresponding to the solid coal side of the coal mining working face, a vertical borehole is constructed downward from the surface. The depth of the vertical borehole is the depth of the coal seam, and a DAS optical cable is arranged in the vertical hole to obtain a third DAS optical cable.

[0070] Furthermore, in a possible implementation manner of the embodiment of the present invention, the third DAS optical cable intersects the first DAS optical cable perpendicularly, and the distance between each of the third DAS optical cables is a second distance threshold.

[0071] Further, in a possible implementation of the embodiment of the present invention, the first building module 62 is specifically used to:

[0072] Each point on the first DAS optical cable is used as a vibration sensing point. When the gauge length of the first DAS optical cable is infinitely small, the first normal plane of the first DAS optical cable can be uniquely determined for each rupture in the coal mine roof, wherein each point in the first normal plane satisfies the time-sequencing of the vibration waveform, that is, each point in the first normal plane is a vibration sensing point.

[0073] The second building module 63 is specifically used for:

[0074] Each point on the second DAS optical cable is used as a vibration sensing point. When the gauge length of the second DAS optical cable is infinitely small, the second normal plane of the second DAS optical cable can be uniquely determined for each rupture in the coal mine roof, wherein each point in the second normal plane satisfies the time-sequencing of the vibration waveform, that is, each point in the second normal plane is a vibration sensing point.

[0075] The third building block 64 is specifically used for:

[0076] Each point on the third DAS optical cable serves as a vibration sensing point. When the gauge length of the third DAS optical cable is infinitely small, the third normal plane of the third DAS optical cable can be uniquely determined for each rupture in the coal mine roof, wherein each point in the third normal plane satisfies the time ordering of the vibration waveform, that is, each point in the third normal plane is a vibration sensing point.

[0077] Further, in a possible implementation manner of the embodiment of the present invention, the determining module 65 is specifically configured to:

[0078] The first normal plane, the second normal plane, and the third normal plane are perpendicular to each other, when the first normal plane is α1x+b1y+c1z+d1=0, the second normal plane is α2x+b2y+c2z+d2=0, and the third normal plane is α3x+b3y+c3z+d3=0;

[0079] α1x+b1y+c cz+d1=0, α2x+b2y+c2z+d2=0, α3x+b3y+c3z+d3=0 to form a three-variable linear equation system A, and transform the three-variable linear equation system into a matrix form AX=B to solve the three-variable linear equation system X=(A -1 )B;

[0080] in, det(A)≠0;

[0081] The solution of the three-variable linear equation system is X=(A -1 )B is taken as the spatial intersection of the first normal plane, the second normal plane and the third normal plane, and the spatial intersection is taken as the rupture position of the coal mine roof.

[0082] The distributed optical fiber-based coal mine roof rupture location positioning device of the embodiment of the present invention records the vibration waveform of each vibration sensing point on the distributed DAS optical cable through the distributed DAS vibration acquisition system after the coal mining working face corresponds to the coal mine roof rupture. The distributed DAS optical cable includes two vertically intersecting first DAS optical cables and second DAS optical cables arranged along the inclination direction and the strike direction of the coal mining working face on the surface above the coal mining working face, and a third DAS optical cable vertically intersecting the first DAS optical cable in the coal pillar area on the side of the solid coal. The vibration waveforms of each vibration sensing point on each DAS optical cable are sequentially arranged in time to construct three corresponding normal planes; the spatial intersection of the three normal planes is used as the coal mine roof rupture position. Thus, the high-precision coal mine roof rupture point position is obtained by using the principle of the intersection of the normal planes of the three optical cables, thereby improving the accuracy of earthquake source positioning.

[0083] In order to implement the above embodiment, the present invention further provides an electronic device, including:

[0084] at least one processor; and

[0085] a memory communicatively connected to the at least one processor; wherein,

[0086] The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can perform the aforementioned method.

[0087] In order to implement the above embodiment, the present invention further proposes a non-transitory computer-readable storage medium storing computer instructions, where the computer instructions are used to enable the computer to execute the above method.

[0088] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0089] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0090] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.

[0091] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0092] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of 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, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0093] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0094] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0095] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A method for locating the fracture position of coal mine roof based on distributed optical fiber, characterized in that: The method comprises: After the coal mine roof rupture occurs at the coal mining face, the vibration wave propagates outward, and the vibration waveform of each vibration sensing point on the distributed DAS optical cable is recorded by the distributed DAS vibration acquisition system, wherein the distributed DAS optical cable includes two vertically intersecting first DAS optical cables and second DAS optical cables arranged on the surface above the coal mining face along the inclination direction and the strike direction of the coal mining face, respectively, and a third DAS optical cable vertically intersecting the first DAS optical cable in the coal pillar area on the physical coal side of the coal mining face; Constructing a first normal plane of the first DAS optical cable according to the order of arrival of the vibration waveform of each vibration sensing point on the first DAS optical cable; Constructing a second normal plane of the second DAS optical cable according to the order of arrival of the vibration waveform of each vibration sensing point on the second DAS optical cable; Constructing a third normal plane of the third DAS optical cable according to the order of arrival of the vibration waveform of each vibration sensing point on the third DAS optical cable; The first normal plane, the second normal plane, and the third normal plane are perpendicular to each other, and have only one spatial intersection point, and the spatial intersection point is used as the fracture position of the coal mine roof.

2. The method for locating the fracture position of coal mine roof based on distributed optical fiber according to claim 1, characterized in that: in: The first DAS optical cable is arranged from a preset first distance threshold behind the cut-eye of the coal mining face, and a first DAS optical cable is arranged every second distance threshold, and in the inclination direction of the coal mining face, the length of the first DAS optical cable covers the inclination length of the coal mining face and extends to the inclination length of at least one adjacent coal mining face, wherein the second distance threshold is greater than the first distance threshold; The second DAS optical cable is arranged from the preset first distance threshold behind the cut eye of the coal mining face, and is arranged to the first distance threshold outside the corresponding stop mining line of the coal mining face, and is located at the midpoint of the coal mining face in the inclination direction of the coal mining face.

3. The method for locating the fracture position of coal mine roof based on distributed optical fiber according to claim 1, characterized in that: The laying method of the third DAS optical cable includes: In the coal pillar area corresponding to the solid coal side of the coal mining working face, a vertical borehole is constructed downward from the surface. The depth of the vertical borehole is the depth of the coal seam, and a DAS optical cable is arranged in the vertical hole to obtain a third DAS optical cable.

4. The method for locating the fracture position of coal mine roof based on distributed optical fiber according to claims 2 and 3, characterized in that: The third DAS optical cable intersects the first DAS optical cable perpendicularly, and the distance between each of the third DAS optical cables is a second distance threshold.

5. The method for locating the fracture position of coal mine roof based on distributed optical fiber according to claim 1, characterized in that: The constructing a first normal plane of the first DAS optical cable according to the order of arrival of the vibration waveform of each vibration sensing point on the first DAS optical cable comprises: Each point on the first DAS optical cable is used as a vibration sensing point. When the gauge length of the first DAS optical cable is infinitely small, the first normal plane of the first DAS optical cable can be uniquely determined for each rupture in the coal mine roof, wherein each point in the first normal plane satisfies the time-sequencing of the vibration waveform, that is, each point in the first normal plane is a vibration sensing point. The constructing a second normal plane of the second DAS optical cable according to the order of arrival of the vibration waveform of each vibration sensing point on the second DAS optical cable comprises: Each point on the second DAS optical cable is used as a vibration sensing point. When the gauge length of the second DAS optical cable is infinitely small, the second normal plane of the second DAS optical cable can be uniquely determined for each rupture in the coal mine roof, wherein each point in the second normal plane satisfies the time-sequencing of the vibration waveform, that is, each point in the second normal plane is a vibration sensing point. The constructing a third normal plane of the third DAS optical cable according to the order of arrival of the vibration waveform of each vibration sensing point on the third DAS optical cable comprises: Each point on the third DAS optical cable serves as a vibration sensing point. When the gauge length of the third DAS optical cable is infinitely small, the third normal plane of the third DAS optical cable can be uniquely determined for each rupture in the coal mine roof, wherein each point in the third normal plane satisfies the time ordering of the vibration waveform, that is, each point in the third normal plane is a vibration sensing point.

6. The method for locating the fracture position of coal mine roof based on distributed optical fiber according to claim 5, characterized in that: The first normal plane, the second normal plane, and the third normal plane are perpendicular to each other, and have only one spatial intersection point, and the spatial intersection point is used as the coal mine roof fracture position, including: The first normal plane, the second normal plane, and the third normal plane are perpendicular to each other, when the first normal plane is α1x+b1y+c1z+d1=0, the second normal plane is α2x+b2y+c2z+d2=0, and the third normal plane is α3x+b3y+c3z+d3=0; α1x+b1y+c c z+d1=0, α2x+b2y+c2z+d2=0, α3x+b3y+c3z+d3=0 to form a three-variable linear equation system A, and transform the three-variable linear equation system into a matrix form AX=B to solve the three-variable linear equation system X=(A -1 )B; in, det(A)≠0; The solution of the three-variable linear equation system is X=(A -1 )B is taken as the spatial intersection of the first normal plane, the second normal plane and the third normal plane, and the spatial intersection is taken as the rupture position of the coal mine roof.

7. A device for locating the fracture position of a coal mine roof based on distributed optical fiber, characterized in that: The device comprises: A recording module is used for recording the vibration waveform of each vibration sensing point on the distributed DAS optical cable through a distributed DAS vibration collection system after the coal mine roof rupture occurs at the coal mining face and the vibration wave propagates outward, wherein the distributed DAS optical cable includes two vertically intersecting first DAS optical cables and second DAS optical cables arranged on the surface above the coal mining face along the inclination direction of the coal mining face and the strike direction of the coal mining face, respectively, and a third DAS optical cable vertically intersecting the first DAS optical cable in the coal pillar area on the side of the coal mining face corresponding to the physical coal; A first construction module, configured to construct a first normal plane of the first DAS optical cable according to the order of arrival of the vibration waveform of each vibration sensing point on the first DAS optical cable; A second construction module, configured to construct a second normal plane of the second DAS optical cable according to the order of arrival of the vibration waveform of each vibration sensing point on the second DAS optical cable; A third construction module, configured to construct a third normal plane of the third DAS optical cable according to the order of arrival of the vibration waveform of each vibration sensing point on the third DAS optical cable; A determination module is used to determine that the first normal plane, the second normal plane, and the third normal plane are perpendicular to each other, and have only one spatial intersection point, and the spatial intersection point is used as the coal mine roof rupture position.

8. The device for locating the fracture position of coal mine roof based on distributed optical fiber according to claim 6, characterized in that: in: The first DAS optical cable is arranged from a preset first distance threshold behind the cut-eye of the coal mining face, and a first DAS optical cable is arranged every second distance threshold, and in the inclination direction of the coal mining face, the length of the first DAS optical cable covers the inclination length of the coal mining face and extends to the inclination length of at least one adjacent coal mining face, wherein the second distance threshold is greater than the first distance threshold; The second DAS optical cable is arranged from the preset first distance threshold behind the cut eye of the coal mining face, and is arranged to the first distance threshold outside the corresponding stop mining line of the coal mining face, and is located at the midpoint of the coal mining face in the inclination direction of the coal mining face.

9. The device for locating coal mine roof rupture position based on distributed optical fiber according to claim 6, characterized in that: The laying method of the third DAS optical cable includes: In the coal pillar area corresponding to the solid coal side of the coal mining working face, a vertical borehole is constructed downward from the surface. The depth of the vertical borehole is the depth of the coal seam, and a DAS optical cable is arranged in the vertical hole to obtain a third DAS optical cable.

10. The device for locating the fracture position of coal mine roof based on distributed optical fiber according to claims 8 and 9, characterized in that: The third DAS optical cable intersects the first DAS optical cable perpendicularly, and the distance between each of the third DAS optical cables is a second distance threshold.

11. The method for locating the fracture position of coal mine roof based on distributed optical fiber according to claim 7, characterized in that: The first building module is specifically used for: Each point on the first DAS optical cable is used as a vibration sensing point. When the gauge length of the first DAS optical cable is infinitely small, the first normal plane of the first DAS optical cable can be uniquely determined for each rupture in the coal mine roof, wherein each point in the first normal plane satisfies the time-sequencing of the vibration waveform, that is, each point in the first normal plane is a vibration sensing point. The second building block is specifically used for: Each point on the second DAS optical cable is used as a vibration sensing point. When the gauge length of the second DAS optical cable is infinitely small, the second normal plane of the second DAS optical cable can be uniquely determined for each rupture in the coal mine roof, wherein each point in the second normal plane satisfies the time-sequencing of the vibration waveform, that is, each point in the second normal plane is a vibration sensing point. The third building block is specifically used for: Each point on the third DAS optical cable serves as a vibration sensing point. When the gauge length of the third DAS optical cable is infinitely small, the third normal plane of the third DAS optical cable can be uniquely determined for each rupture in the coal mine roof, wherein each point in the third normal plane satisfies the time ordering of the vibration waveform, that is, each point in the third normal plane is a vibration sensing point.

12. The device for locating coal mine roof rupture position based on distributed optical fiber according to claim 11, characterized in that: The determination module is specifically used for: The first normal plane, the second normal plane, and the third normal plane are perpendicular to each other, when the first normal plane is α1x+b1y+c1z+d1=0, the second normal plane is α2x+b2y+c2z+d2=0, and the third normal plane is α3x+b3y+c3z+d3=0; α1x+b1y+c c z+d1=0, α2x+b2y+c2z+d2=0, α3x+b3y+c3z+d3=0 to form a three-variable linear equation system A, and transform the three-variable linear equation system into a matrix form AX=B to solve the three-variable linear equation system X=(A -1 )B; in, det(A)≠0; The solution of the three-variable linear equation system is X=(A -1 )B is taken as the spatial intersection of the first normal plane, the second normal plane and the third normal plane, and the spatial intersection is taken as the rupture position of the coal mine roof.

13. An electronic device, characterized in that: include: at least one processor; as well as a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the method according to any one of claims 1 to 6.

14. A non-transitory computer-readable storage medium storing computer instructions, characterized in that: The computer instructions are used to cause the computer to execute the method according to any one of claims 1-6.

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