A device and method for real-time monitoring of movement trajectory of rock layers on top of a mine

Abstract

The present invention provides a device and method for real-time monitoring of the movement trajectory of the rock layer on the top of a mine, and relates to the technical field of monitoring the movement of the rock layer on the top of a mine. The device for real-time monitoring of the movement trajectory of the rock layer on the top of a mine of the present invention has fewer parts and components, and the assembly process is simple and rapid when used on site. It can be assembled and used according to the actual length of the monitoring borehole in the monitoring of the top of a mine; the device for real-time monitoring of the movement trajectory of the rock layer on the top of a mine of the present invention has a simple structure, is easy to process and manufacture, uses fewer precision instruments inside, and the cost of the entire device is relatively low, which can reduce the investment cost of mine monitoring; the device for real-time monitoring of the movement trajectory of the rock layer on the top of a mine of the present invention is used to monitor the rock layer on the top of a mine in real time, and can monitor the movement trajectory of the roof rock layer in real time, accurately, and continuously, and provide more detailed rock layer information for the prevention and control of disasters such as mine pressure, rock layer control, and rock burst.

Description

Technical Field

[0001] The invention relates to the technical field of mine top slab rock layer movement monitoring, and in particular to a device and method for real-time monitoring of the movement trajectory of a mine top slab rock layer. Background Art

[0002] As the mining of underground working faces in coal mines progresses, the roof of the goaf area will break and collapse, causing rock movement and changes in the stress field in the strata, and even major safety accidents such as rock burst. Therefore, it is necessary to monitor the movement of the rock strata on the top of the mine. At present, the roof rock strata monitoring methods used in coal mines mainly include column-type roof displacement sensor monitoring, borehole TV peek monitoring, and double-end water plugging monitoring. For example, a column-type roof displacement sensor is installed in the filling goaf area. The column-type roof displacement sensor can monitor the sinking speed and settlement displacement of the rock strata roof in the filling goaf area throughout the whole process. The disadvantage is that the sensor has high requirements for the stability of the bottom plate at the installation site, the protection of the communication lines and equipment, and is only suitable for monitoring the surface displacement of the roof rock strata inside the filling goaf area. The use of high-resolution borehole television to spy on rock cracks has the advantages of simple operation and intuitive monitoring results. It is widely used in geological engineering and coal mine roof monitoring fields, but it has the following disadvantages: the monitoring results are affected by the quality of the rock formation and the drilling effect. The TV probe is easily covered by the mud and sand in the borehole or stuck by the gravel in the hole, resulting in poor imaging effects. In addition, borehole television peeping can only detect the development state of rock formation cracks at a certain moment, and cannot monitor the movement process of the rock formation. The double-end water plugging method is to first plug a certain distance of the borehole with a plugger, and then inject water into the borehole. The degree of rock formation crack development and the height of the fracture zone are determined by the amount of water loss in the plugged section of the borehole. The disadvantages are that the drilling depth is large, the measurement data is not accurate enough, and the measurement efficiency is low. The above-mentioned monitoring methods all have certain limitations. They can only detect the degree of crack development of the roof rock formation and monitor the fracture state of the rock formation, and cannot effectively obtain the specific structure of the rock formation and the whole process information of its movement. Summary of the invention

[0003] The object of the present invention is to provide a device and method for real-time monitoring of the movement trajectory of the roof rock strata of a mine, so as to monitor the movement trajectory of the roof rock strata in real time, accurately and continuously.

[0004] In order to achieve the above object, the technical solutions adopted by the present invention are as follows:

[0005] A device for real-time monitoring of the movement trajectory of the rock layer on the top of a mine, comprising a support pipe, a connecting pipe, a displacement sensor, an angle sensor, a sealing ring, a grouting main pipe, a grouting branch pipe, a grouting unit and a data acquisition unit;

[0006] The support pipe is made of hard material, and the connecting pipe is made of soft material. The connecting pipe can be compressed, stretched or bent under the action of external force;

[0007] Several support tubes are connected end to end in sequence, and two adjacent support tubes are connected via a connecting tube;

[0008] Between two adjacent support tubes, at least one support tube is provided with a displacement sensor, and the displacement sensor is used to measure the distance between the two adjacent support tubes;

[0009] An angle sensor is provided in each support tube, and the angle sensor is used to measure the angle of the support tube in which it is located;

[0010] At least one sealing ring is disposed in the circumference of the head end and the tail end of each support tube;

[0011] The grouting main pipe passes through each support pipe and the connecting pipe, and at least one grouting branch pipe is arranged inside each support pipe, one end of the grouting branch pipe is connected to the grouting main pipe, and the other end of the grouting branch pipe is exposed from the side wall of the support pipe, and the other end of the grouting branch pipe is located between the two sealing rings;

[0012] The grouting unit is connected to the grouting main pipe and is used to inject slurry into the grouting main pipe;

[0013] The data acquisition unit signal is connected to the displacement sensor and the angle sensor to collect distance and angle data.

[0014] Preferably, the displacement sensor is configured as a pull-wire displacement sensor, and at least two pull-wire displacement sensors are arranged between two adjacent support tubes, the main end of the pull-wire displacement sensor is connected to the head end of an adjacent support tube, and the pull wire end of the pull-wire displacement sensor is connected to the tail end of another adjacent support tube.

[0015] Preferably, two pull-wire displacement sensors are arranged between two adjacent support tubes;

[0016] The main body end of a pull-wire displacement sensor is connected to the axial position of the head end of an adjacent support tube, and the pull-wire end of a pull-wire displacement sensor is connected to the axial position of the tail end of another adjacent support tube;

[0017] The main body end of another pull-wire displacement sensor is connected to the upper edge position of the head end of an adjacent support tube, and the pull-wire end of another pull-wire displacement sensor is connected to the upper edge position of the tail end of another adjacent support tube.

[0018] Preferably, the grouting branch pipe is connected to the support pipe via a buckle, and under the action of external force, the buckle is separated from the support pipe.

[0019] Preferably, the sealing ring is made of soft material.

[0020] A method for real-time monitoring of the movement trajectory of the rock layer on the top of a mine, using the above-mentioned real-time monitoring device for the movement trajectory of the rock layer on the top of a mine, the method comprises the following steps:

[0021] Step 1: Drilling a hole in the top rock layer of the tunnel or working surface to form a monitoring hole;

[0022] Step 2: Push the supporting pipe and the connecting pipe connected in sequence into the monitoring borehole, and fit the sealing ring to the inner wall of the supporting pipe and the monitoring borehole;

[0023] Step 3: The grouting unit injects slurry into the grouting main pipe and the grouting branch pipe, and the slurry flows to the support pipe, the inner wall of the monitoring borehole and the space between the two sealing rings;

[0024] Step 4: After the slurry solidifies, the data acquisition unit collects the distance data measured by the displacement sensor and the angle data measured by the angle sensor in real time, and then obtains the real-time horizontal and vertical positions of any support tube. The real-time horizontal and vertical positions of each support tube are used to depict the movement trajectory of the roof rock layer.

[0025] Preferably, in step 4,

[0026] The horizontal position X of any support tube n The calculation formula is:

[0027]

[0028] Where:

[0029] l—the length of the support tube, in cm;

[0030] α1—The angle of the first support tube measured by the angle sensor, in degrees;

[0031] α2—The angle of the second support tube is measured by the angle sensor, in degrees;

[0032] α n —The angle of the nth support tube is measured by the angle sensor in degrees;

[0033] d1—The projection value of the distance between the first support tube and the second support tube measured by the displacement sensor in the x direction, in cm;

[0034] d2—projection value of the distance between the second support tube and the third support tube measured by the displacement sensor in the x direction, in cm;

[0035] d (n-1) —The projection value of the distance between the n-1th support tube and the nth support tube in the x direction is measured by the displacement sensor, in cm;

[0036] The calculation formula for the vertical position of any support pipe is:

[0037]

[0038] l—the length of the support tube, in cm;

[0039] α1—The angle of the first support tube measured by the angle sensor, in degrees;

[0040] α2—The angle of the second support tube is measured by the angle sensor, in degrees;

[0041] α n —The angle of the nth support tube is measured by the angle sensor in degrees;

[0042] h1—the projection value of the distance between the first support tube and the second support tube measured by the displacement sensor in the y direction, in cm;

[0043] h2—the projection value of the distance between the second support tube and the third support tube measured by the displacement sensor in the y direction, in cm;

[0044] h (n-1) —The projection value of the distance between the n-1th support tube and the nth support tube in the y direction is measured by the displacement sensor, in cm.

[0045] Preferably, in step 3, after the grouting is completed but before the slurry solidifies, the grouting main pipe is withdrawn from the monitoring borehole.

[0046] The beneficial technical effects of the present invention are:

[0047] The device for real-time monitoring the movement trajectory of the rock layer on the top of a mine of the present invention has fewer parts and components, and the assembly process is simple and rapid when used on site. It can be assembled and used according to the actual length of the monitoring borehole in the monitoring of the top of a mine.

[0048] The real-time monitoring device for the movement trajectory of the rock layer on the top of the mine of the present invention has a simple structure, is easy to process and manufacture, uses fewer precision instruments inside, and has a relatively low cost for the entire device, which can reduce the investment cost of mine monitoring.

[0049] The device for real-time monitoring the movement trajectory of the roof rock strata of a mine is applied to monitor the movement trajectory of the roof rock strata in real time, which can monitor the movement trajectory of the roof rock strata in real time, accurately and continuously, and provide more detailed rock strata information for disaster prevention and control such as mine pressure, rock strata control and impact ground pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a structural schematic diagram of a device for real-time monitoring of the movement trajectory of rock layers on the top of a mine according to an embodiment of the present invention;

[0051] Figure 2 It is a schematic diagram of the construction arrangement of a device for real-time monitoring of the movement trajectory of rock layers on the top of a mine according to an embodiment of the present invention;

[0052] Figure 3 This is a calculation principle diagram of the distance between two adjacent support tubes measured by the displacement sensor according to an embodiment of the present invention;

[0053] Figure 4 Schematic diagram of the motion trajectory of the support tube according to an embodiment of the present invention. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical scheme and beneficial effects of the present invention more clearly understood, the present invention is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings. Certain embodiments of the present invention will be described more comprehensively with reference to the accompanying drawings, in which some but not all embodiments will be shown. In fact, the various embodiments of the present invention can be implemented in many different forms and should not be construed as being limited to the embodiments described herein; rather, these embodiments are provided so that the present invention meets applicable legal requirements.

[0055] In the description of the present invention, it should be noted that the terms "inside", "outside", "upper", "lower", "front", "back" and the like indicate directions or positional relationships based on directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0056] In an embodiment of the present invention, a device and method for real-time monitoring of the movement trajectory of the rock layer on the top of a mine are provided. Please refer to Figures 1 to 4 shown.

[0057] A device for real-time monitoring of the movement trajectory of a mine top slab rock layer comprises a support pipe 1, a connecting pipe 2, a displacement sensor 4, an angle sensor 3, a sealing ring 5, a grouting main pipe 6, a grouting branch pipe, a grouting unit and a data acquisition unit.

[0058] The support tube 1 is made of a hard material, and both ends of the support tube 1 are closed. The connecting tube 2 is made of a soft material, and the connecting tube 2 can be compressed, stretched or bent under the action of an external force. Among them, the length of the support tube 1 is 40 cm, the minimum length of the connecting tube 2 after compression is 8 cm, and the maximum length after stretching is 25 cm.

[0059] A plurality of support tubes 1 are connected end to end in sequence, and two adjacent support tubes 1 are connected via a connecting tube 2 .

[0060] Between two adjacent support tubes 1 , at least one support tube 1 is provided with a displacement sensor 4 , and the displacement sensor 4 is used to measure the distance between the two adjacent support tubes 1 .

[0061] The displacement sensor 4 is configured as a pull-wire displacement sensor. At least one pull-wire displacement sensor is arranged between two adjacent support tubes 1. The main end of the pull-wire displacement sensor is connected to the head end of an adjacent support tube 1, and the pull-wire end of the pull-wire displacement sensor is connected to the tail end of another adjacent support tube 1.

[0062] Specifically, two pull-wire displacement sensors are arranged between two adjacent support tubes 1; the main body end of one pull-wire displacement sensor is connected to the axial position of the head end of an adjacent support tube 1, and the pull-wire end of one pull-wire displacement sensor is connected to the axial position of the tail end of another adjacent support tube 1; the main body end of another pull-wire displacement sensor is connected to the upper edge position of the head end of an adjacent support tube 1, and the pull-wire end of another pull-wire displacement sensor is connected to the upper edge position of the tail end of another adjacent support tube 1.

[0063] An angle sensor 3 is disposed in each support tube 1 , and the angle sensor 3 is used to measure the angle of the support tube 1 where the angle sensor 3 is located, which is the angle between the axis of the support tube 1 and the horizontal line.

[0064] A sealing ring 5 is disposed around the head end and the tail end of each support tube 1. The sealing ring 5 is made of a soft material (rubber) so that the sealing ring 5 fits tightly against the support tube 1 and the inner wall of the monitoring borehole 7, so that the support tube 1 and the inner wall of the monitoring borehole 7 are sealed and connected by the sealing ring 5, so that a closed space is formed between the support tube 1, the inner wall of the monitoring borehole 7 and the two sealing rings 5.

[0065] The grouting main pipe 6 passes through each support pipe 1 and the connecting pipe 2. Two grouting branch pipes are arranged inside each support pipe 1. The two grouting branch pipes are arranged coaxially and vertically arranged with the grouting main pipe 6. One end of the grouting branch pipe is connected to the grouting main pipe 6, and the other end of the grouting branch pipe is exposed from the side wall of the support pipe 1. The other end of the grouting branch pipe is located between the two sealing rings 5.

[0066] The grouting unit is located along the empty tunnel 8, and the grouting unit is connected to the grouting main pipe 6, and is used to inject slurry into the grouting main pipe 6 and the grouting branch pipe. When the grouting unit injects slurry into the grouting main pipe 6 and the grouting branch pipe, the slurry enters the above-mentioned closed space from the grouting branch pipe, and after the slurry solidifies, the slurry fixes the support pipe 1 and the top rock layer as a whole. In this way, the support pipe 1 can migrate and rotate along with the top rock layer. Among them, the two sealing rings 5 ​​are used to confine the slurry to the closed space on the outside of the support pipe 1 to prevent the slurry from flowing to the position between adjacent support pipes 1, thereby preventing the slurry from solidifying so that the connecting pipe 2 cannot be compressed, stretched or bent.

[0067] The data acquisition unit is located in the gob-side tunnel 8, and the data acquisition unit is connected to each displacement sensor 4 and the angle sensor 3 by signal, and is used to collect distance data through the displacement sensor 4 and collect angle data through the angle sensor 3. The data acquisition unit can be connected to each displacement sensor 4 and the angle sensor 3 through a signal cable, and the signal cable passes through the support tube 1 and the connecting tube 2.

[0068] The grouting branch pipe is connected to the support pipe 1 via a plastic buckle, and the buckle is separated from the support pipe 1 under the action of external force. In this way, when it is necessary to withdraw the grouting main pipe 6 from the monitoring borehole 7, it is only necessary to pull the grouting main pipe 6 outside the monitoring borehole 7 to separate the grouting main pipe 6 and the grouting branch pipe from the support pipe 1. It is prevented that the grouting main pipe 6 solidifies inside the support pipe 1 and the connecting pipe 2, and during the migration and rotation of the top rock layer, the solidified grouting main pipe 6 is prevented from damaging the angle sensor 3 or the displacement sensor 4.

[0069] A method for real-time monitoring of the movement trajectory of the rock layer on the top of a mine, using the real-time monitoring device for the movement trajectory of the rock layer on the top of a mine described in this embodiment, the method comprises the following steps:

[0070] Step 1: Leave a coal pillar 9 on one side of the goaf 10 and set up a goaf-side tunnel 8. Drill a monitoring borehole 7 from the goaf-side tunnel 8 or the top of the working face toward the goaf 10 or the solid coal roof rock layer. The drilling depth should reach the key layer 11.

[0071] Step 2: Determine the connection length of the support tube 1 and the connecting tube 2 according to the depth of the monitoring borehole 7, push the support tube 1 and the connecting tube 2 connected in sequence into the monitoring borehole 7, and fit the sealing ring 5 to the inner wall of the support tube 1 and the monitoring borehole 7.

[0072] Step 3: The grouting unit injects slurry into the grouting main pipe 6 and the grouting branch pipe, and the slurry flows to the support pipe 1, the inner wall of the monitoring borehole 7 and the space between the two sealing rings 5. After the grouting is completed but before the slurry solidifies, the grouting main pipe 6 is withdrawn from the monitoring borehole 7.

[0073] Step 4: After the slurry solidifies, the data acquisition unit collects the distance data measured by the displacement sensor 4 and the angle data measured by the angle sensor 3 in real time, and then obtains the real-time horizontal and vertical positions of any support tube 1. The real-time horizontal and vertical positions of each support tube 1 depict the movement trajectory of the roof rock layer.

[0074] In step 4,

[0075] The horizontal position X of any support tube 1 n The calculation formula is:

[0076]

[0077] Where:

[0078] l—the length of the support tube 1, in cm;

[0079] α1—the angle of the first support tube 1 measured by the angle sensor 3, in degrees;

[0080] α2—the angle of the second support tube 1 measured by the angle sensor 3, in degrees;

[0081] α n —The angle of the nth support tube 1 is measured by the angle sensor 3 in degrees;

[0082] d1—projection value of the distance between the first support tube 1 and the second support tube 1 measured by the displacement sensor 4 in the x direction, in cm;

[0083] d2—projection value of the distance between the second support tube 1 and the third support tube 1 measured by the displacement sensor 4 in the x direction, in cm;

[0084] d (n-1) — The projection value of the distance between the n-1th support tube 1 and the nth support tube 1 in the x direction is measured by the displacement sensor 4, in cm;

[0085] The calculation formula for the vertical position of any support tube 1 is:

[0086]

[0087] l—the length of the support tube 1, in cm;

[0088] α1—the angle of the first support tube 1 measured by the angle sensor 3, in degrees;

[0089] α2—the angle of the second support tube 1 measured by the angle sensor 3, in degrees;

[0090] α n —The angle of the nth support tube 1 is measured by the angle sensor 3 in degrees;

[0091] h1—projection value of the distance between the first support tube 1 and the second support tube 1 measured by the displacement sensor 4 in the y direction, in cm;

[0092] h2—projection value of the distance between the second support tube 1 and the third support tube 1 measured by the displacement sensor 4 in the y direction, in cm;

[0093] h (n-1) —The projection value of the distance between the n-1th support tube 1 and the nth support tube 1 in the y direction is measured by the displacement sensor 4, in cm.

[0094] in,

[0095] The specific calculation method of the relative positions of adjacent support tubes 1 is:

[0096] Each support tube 1 has the same specifications and dimensions. The angle between support tube i and support tube i+1 measured by angle sensor 3 is α n-1 , α n The radius of support tube 1 is r, and the distance between support tube i and support tube i+1 is L i , L' i ; Among them, the distance L i The distance L' is measured by a pull-rope displacement sensor 4 connecting the axial positions of the head and tail ends of the adjacent support tubes 1. i The displacement is measured by a pull-rope displacement sensor 4 connected to the upper edge positions of the head and tail ends of the adjacent support tubes 1 .

[0097] Assume that the angles between the pull ropes of the two pull rope displacement sensors 4 and the horizontal direction are θ i ,θ' i , respectively, draw rectangles with the radius of support tube i, support tube i+1 and the ropes of the two rope displacement sensors 4 as diagonals. According to the geometric relationship and trigonometric function relationship, we can get:

[0098] RCOsα n -L' i sinθ' i =rcosα n-1 -L i sinθ i ;

[0099] L' i cosθ' i -rsinα n-1 =L i cosθ i -rsinα n ;

[0100] in,

[0101] r—radius of support tube 1, in cm;

[0102] L i —A pull rope displacement sensor 4 connected to the axis position of the head and tail ends of the adjacent support tubes 1 measures the length of the pull rope in cm;

[0103] L' i —A pull rope displacement sensor 4 connected to the upper edge of the head and tail ends of the adjacent support tubes 1 measures the length of the pull rope in cm;

[0104] α n-1—The angle of the n-1th support tube 1, in degrees;

[0105] α n —The angle of the nth support tube 1, in degrees;

[0106] θ i —The angle between the pull rope of a pull rope displacement sensor 4 connecting the axis positions of the n-1th support tube 1 and the head and tail ends of the nth support tube 1 and the horizontal direction, in degrees;

[0107] θ' i —The angle between the pull rope of a pull rope displacement sensor 4 connecting the upper edge of the first and tail ends of the n-1th support tube 1 and the horizontal direction, in degrees;

[0108] According to the above two formulas, the angle θ between the pull rope of the pull rope displacement sensor 4 between the support tube i and the support tube i+1 and the horizontal direction can be obtained: i and θ′ i ,

[0109] You can get

[0110] The projection value d of the distance between the n-1th support tube 1 and the nth support tube 1 in the x direction (n-1) The calculation formula is:

[0111] d (n-1) =L i cosθ i ;

[0112] The projection value h of the distance between the n-1th support tube 1 and the nth support tube 1 in the y direction (n-1) The calculation formula is:

[0113] h (n-1) =L i sinθ i .

[0114] So far, the present embodiment has been described in detail in conjunction with the accompanying drawings. Based on the above description, those skilled in the art should have a clear understanding of the real-time monitoring device and method for the movement trajectory of the rock layer on the top of the mine of the present invention. The real-time monitoring device for the movement trajectory of the rock layer on the top of the mine of the present invention has fewer parts and components, and the assembly process is simple and rapid when used on site. It can be assembled and used according to the actual length of the monitoring borehole 7 in the monitoring of the top of the mine; the real-time monitoring device for the movement trajectory of the rock layer on the top of the mine of the present invention has a simple structure and is easy to process and manufacture. It uses fewer precision instruments inside, and the relatively precise instruments are only the angle sensor 3 and the displacement sensor 4. The cost of the entire device is relatively low, which can reduce the investment cost of mine monitoring; the real-time monitoring device for the movement trajectory of the rock layer on the top of the mine of the present invention is used to monitor the rock layer on the top of the mine in real time, and the movement trajectory of the roof rock layer can be monitored in real time, accurately and continuously, and more detailed rock layer information can be provided for the prevention and control of disasters such as mine pressure, rock layer control and rock burst.

[0115] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for real-time monitoring of the movement trajectory of rock layers on the top of a mine, characterized in that: It includes a support pipe, a connecting pipe, a displacement sensor, an angle sensor, a sealing ring, a grouting main pipe, a grouting branch pipe, a grouting unit and a data acquisition unit; The support pipe is made of hard material, and the connecting pipe is made of soft material. The connecting pipe can be compressed, stretched or bent under the action of external force; Several support tubes are connected end to end in sequence, and two adjacent support tubes are connected via a connecting tube; Between two adjacent support tubes, at least one support tube is provided with a displacement sensor, and the displacement sensor is used to measure the distance between the two adjacent support tubes; An angle sensor is provided in each support tube, and the angle sensor is used to measure the angle of the support tube in which it is located; At least one sealing ring is disposed in the circumference of the head end and the tail end of each support tube; The grouting main pipe passes through each support pipe and the connecting pipe, and at least one grouting branch pipe is arranged inside each support pipe, one end of the grouting branch pipe is connected to the grouting main pipe, and the other end of the grouting branch pipe is exposed from the side wall of the support pipe, and the other end of the grouting branch pipe is located between the two sealing rings; The grouting unit is connected to the grouting main pipe and is used to inject slurry into the grouting main pipe; The data acquisition unit signal is connected to the displacement sensor and the angle sensor to collect distance and angle data; Drilling construction is carried out in the top rock layer of the tunnel or working surface to form monitoring boreholes; Push the supporting pipe and connecting pipe connected in sequence into the monitoring borehole, and fit the sealing ring to the inner wall of the supporting pipe and the monitoring borehole; The grouting unit injects slurry into the grouting main pipe and the grouting branch pipe, and the slurry flows to the support pipe, the inner wall of the monitoring borehole and the space between the two sealing rings; After the slurry solidifies, the data acquisition unit collects the distance data measured by the displacement sensor and the angle data measured by the angle sensor in real time, and then obtains the real-time horizontal and vertical positions of any support pipe. The real-time horizontal and vertical positions of each support pipe are used to describe the movement trajectory of the roof rock layer. in, The horizontal position of any support tube X n The calculation formula is: ； Where: l —The length of the support tube, in cm; α 1—The angle of the first support tube is measured by the angle sensor in degrees; α 2—The angle of the second support tube is measured by the angle sensor in degrees; α n —Measured by the angle sensor n The angle of the root support tube, in degrees; d 1—The projection value of the distance between the first support tube and the second support tube in the x direction is measured by the displacement sensor, in cm; d 2—The projection value of the distance between the second support tube and the third support tube in the x direction is measured by the displacement sensor, in cm; d (n-1) —Measured by displacement sensor n - 1 support tube and n The projection value of the distance between the root support tubes in the x direction, in cm; The calculation formula for the vertical position of any support pipe is: ； l —The length of the support tube, in cm; α 1—The angle of the first support tube is measured by the angle sensor in degrees; α 2—The angle of the second support tube is measured by the angle sensor in degrees; α n —Measured by the angle sensor n The angle of the root support tube, in degrees; h 1—The projection value of the distance between the first support tube and the second support tube in the y direction measured by the displacement sensor, in cm; h 2—The projection value of the distance between the second support tube and the third support tube in the y direction is measured by the displacement sensor, in cm; h (n-1) —Measured by displacement sensor n - 1 support tube and n The projection value of the distance between the root support tubes in the y direction, in cm.

2. The device for real-time monitoring of the movement trajectory of the rock layer on the top of a mine according to claim 1 is characterized by: The displacement sensor is configured as a pull-wire displacement sensor, and at least two pull-wire displacement sensors are arranged between two adjacent support tubes. The main end of the pull-wire displacement sensor is connected to the head end of an adjacent support tube, and the pull-wire end of the pull-wire displacement sensor is connected to the tail end of another adjacent support tube.

3. The device for real-time monitoring of the movement trajectory of the rock layer on the top of a mine according to claim 2 is characterized by: Two pull-rope displacement sensors are arranged between two adjacent support tubes; The main body end of a pull-wire displacement sensor is connected to the axial position of the head end of an adjacent support tube, and the pull-wire end of a pull-wire displacement sensor is connected to the axial position of the tail end of another adjacent support tube; The main body end of another pull-wire displacement sensor is connected to the upper edge position of the head end of an adjacent support tube, and the pull-wire end of another pull-wire displacement sensor is connected to the upper edge position of the tail end of another adjacent support tube.

4. The device for real-time monitoring of the movement trajectory of the rock layer on the top of a mine according to claim 1 is characterized by: The grouting branch pipe is connected to the support pipe via a buckle, and the buckle is separated from the support pipe under the action of external force.

5. The device for real-time monitoring of the movement trajectory of the rock layer on the top of a mine according to claim 1 is characterized by: The sealing ring is made of soft material.

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