Device for real-time monitoring movement trajectory of mine roof strata and method thereof

Abstract

The present disclosure provides a device and a method for real-time monitoring the movement trajectory of mine roof strata, which relates to the technical field of the movement monitoring of mine roof strata. The device described in the present disclosure has fewer components, and the assembly process is simple and fast during use. It can be assembled and used according to the actual length of the monitoring borehole; the structure of the device is relatively simple, easy to manufacture, uses fewer precision instruments, and has a lower cost; by using the device of the present disclosure for real-time monitoring of mine roof strata, the movement trajectory of mine roof strata can be monitored in real-time, accurately, and continuously, providing more detailed strata information for disaster prevention and control such as mine pressure, strata control, and rock burst.

Claims

1. A device for real-time monitoring a movement trajectory of mine roof strata, comprising supporting pipes, connecting pipes, a displacement sensor, an angle sensor, a hole sealing ring, a grouting main pipe, a grouting branch pipe, a grouting unit, and a data acquisition unit; the supporting pipes are made of hard materials, the connecting pipes are made of soft materials and the connecting pipes are capable of being compressed, extended, or bent by an external force; a plurality of supporting pipes are connected end-to-end in sequence, and two adjacent supporting pipes are connected to each other by the connecting pipes; between two adjacent supporting pipes, at least one of the supporting pipes is provided with the displacement sensor for measuring a distance between two adjacent supporting pipes; each of the supporting pipes is provided with one angle sensor, and the angle sensor is used to measure an angle of each of the supporting pipes where the angle sensor is located; at least one hole sealing ring is arranged in a circumferential direction of a head end and a tail end of each of the supporting pipes; a grouting main pipe passes through an interior of each of the supporting pipes and the connecting pipes, at least one grouting branch pipe is installed inside each of the supporting pipes, one end of the grouting branch pipe is communicated with the grouting main pipe, an other end of the grouting branch pipe is exposed from a side wall of the supporting pipe, and the other end of the grouting branch pipe is located between two hole sealing rings; a grouting unit is connected to the grouting main pipe for injecting grout into the grouting main pipe; and a data acquisition unit is in signal connection to the displacement sensor and the angle sensor for collecting distances and angle data; the device is configured to perform a method for real-time monitoring the movement trajectory of mine roof strata, wherein the method comprises the following steps: step 1, drilling a hole in a roof strata of a roadway or a working face to form a monitoring borehole; step 2, pushing the sequentially connected support pipes and the connecting pipes into the monitoring borehole, and the hole sealing ring is attached to the supporting pipes and an inner wall of the monitoring borehole; step 3, injecting grout from the grouting unit into the grouting main pipe and the grouting branch pipe, the grout flows to the supporting pipes, the inner wall of the monitoring borehole, and a space between two the hole sealing rings; after the grouting is completed and before the grout solidifies, removing the grouting main pipe from the monitoring borehole; step 4, after the grout solidifies, collecting, by the data acquisition unit, a distance data measured by the displacement sensor and an angle data measured by the angle sensor in real time, and then obtaining a horizontal position and a vertical position of any of supporting pipes in real-time, and depicting the movement trajectory of roof strata based on the horizontal position and the vertical position of each of supporting pipes in real-time; a calculation formula for the horizontal position X.sub.n of any of supporting pipes is: $X_{n} = I \cos_{1} + d_{1} + I \cos_{2} + d_{2} .Math. + d_{(n - 1)} + \frac{1}{2} I \cos_{n};$ in the calculation formula: la length of the supporting pipe, in cm; .sub.1an angle of a first supporting pipe measured by the angle sensor, in degrees; .sub.2an angle of a second supporting pipe measured by the angle sensor, in degrees; .sub.nan angle of a nth supporting pipe measured by the angle sensor, in degrees; d.sub.1a projection value of a distance between the first supporting pipe and the second supporting pipe in a X direction measured by the displacement sensor, in cm; d.sub.2a projection value of a distance between the second supporting pipe and a third supporting pipe in the X direction measured by the displacement sensor, in cm; d.sub.(n-1)a projection value of the distance between a (n1)th supporting pipe and the nth supporting pipe measured by the displacement sensor in the X direction, in cm; a calculation formula for a vertical position of any of supporting pipes is: $Y_{n} = I \sin_{1} + h_{1} + I \sin_{2} + h_{2} .Math. + h_{(n - 1)} + \frac{1}{2} I \sin_{n};$ la length of supporting pipe, in cm; .sub.1an angle of the first supporting pipe measured by the angle sensor, in degrees; .sub.2an angle of the second supporting pipe measured by the angle sensor, in degrees; .sub.nan angle of the nth supporting pipe measured by the angle sensor, in degrees; h.sub.1a projection value of a distance between the first supporting pipe and the second supporting pipe in a Y direction measured by the displacement sensor, in cm; h.sub.2a projection value of a distance between the second supporting pipe and the third supporting pipe in the Y direction measured by the displacement sensor, in cm; h.sub.(n-1)a projection value of a distance between a (n1)th supporting pipe and the nth supporting pipe in the Y direction measured by the displacement sensor, in cm.

2. The device for real-time monitoring the movement trajectory of mine roof strata according to claim 1, wherein the displacement sensor uses a draw-wire displacement sensor, at least two of the draw-wire displacement sensors are arranged between adjacent supporting pipes, a main body end of the draw-wire displacement sensor is connected to a head end of one of adjacent supporting pipes, and a rope end of the draw-wire displacement sensor is connected to a tail end of the other of adjacent supporting pipes.

3. The device for real-time monitoring the movement trajectory of mine roof strata according to claim 2, wherein two draw-wire displacement sensors are arranged between two adjacent supporting pipes; a main body end of one of the two draw-wire displacement sensors is connected to an axis position of the head end of one of the two adjacent supporting pipes, and the rope end of the rope displacement sensor is connected to an axis position of the tail end of the other of the two adjacent supporting pipes; an main body end of an other of the two rope displacement sensors is connected to an upper edge position of the head end of one of the two adjacent supporting pipes, and the rope end of the other of the rope displacement sensors is connected to the upper edge position of the tail end of the other of the two adjacent supporting pipes.

4. The device for real-time monitoring the movement trajectory of mine roof strata according to claim 1, wherein the grouting branch pipe is connected to the supporting pipes through a buckle, and the buckle capable of disengaging from the supporting pipes under an external force.

5. The device for real-time monitoring the movement trajectory of mine roof strata according to claim 1, wherein the hole sealing ring is made of soft material.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic structural diagram of a device for real-time monitoring the movement trajectory of mine roof strata in the embodiment of the present disclosure;

(2) FIG. 2 is a schematic diagram of the construction layout of the device for real-time monitoring the movement trajectory of mine roof strata in the embodiment of the present disclosure;

(3) FIG. 3 is a schematic diagram of the calculation principle for measuring the distance between adjacent supporting pipes using a displacement sensor in the embodiment of the present disclosure;

(4) FIG. 4 is a schematic diagram of the movement trajectory of the supporting pipe in the embodiment of the present disclosure.

DETAILED DESCRIPTION OF THE EMBODIMENTS

(5) The present invention will be further described with reference to the drawings and preferred embodiments. It should be understood that these embodiments are only used to illustrate the present invention, but the present invention is not limited thereto. In addition, it should be understood that after reading the content described in the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent technical means also fall within the scope of protection of the present invention.

(6) In the present invention, the terms first, second, and third are merely for the purpose of description, but cannot be understood as indicating or implying relative importance. The term multiple means two or more unless otherwise explicitly defined. The terms mount, connect with, connect, fix, and the like shall be understood in a broad sense. For example, connect may mean being fixedly connected, detachably connected, or integrally connected; and connect with may mean being directly connected or indirectly connected through an intermediary. For those of ordinary skill in the art, specific meanings of the above terms in the present invention can be understood according to specific situations.

(7) In the description of the present invention, it should be understood that if orientation or position relations indicated by the terms such as upper, lower, inside, outside, front, back, and the like are based on the orientation or position relations shown in the drawings, and the terms are intended only to facilitate the description of the present invention and simplify the description, rather than indicating or implying that the apparatus or element referred to must have a particular orientation and be constructed and operated in the particular orientation, and therefore cannot be construed as a limitation on the present invention.

(8) In the embodiments of the present disclosure, a device and a method for real-time monitoring the movement trajectory of mine roof strata are provided, as shown in FIG. 1 to FIG. 4.

(9) A device for real-time monitoring the movement trajectory of mine roof strata includes supporting pipes 1, connecting pipes 2, a displacement sensor 4, an angle sensor 3, a hole sealing ring 5, a grouting main pipe 6, a grouting branch pipe, a grouting unit, and a data acquisition unit.

(10) The supporting pipe 1 is made of hard material, and both ends of the supporting pipe 1 is closed. The connecting pipe 2 is made of soft material and can be compressed, extended, or bent by an external force. Wherein the length of the supporting pipe 1 is 40 cm, the minimum length of the connecting pipe 2 after compression is 8 cm, and the maximum length after extension is 25 cm.

(11) A plurality of supporting pipes 1 are connected end-to-end in sequence, and two adjacent supporting pipes 1 are connected to each other by a connecting pipe 2.

(12) Between two adjacent supporting pipes 1, at least one supporting pipe 1 is provided with a displacement sensor 4 for measuring the distance between two adjacent supporting pipes 1.

(13) The displacement sensor 4 uses a draw-wire displacement sensor, and at least one draw-wire displacement sensor is arranged between adjacent supporting pipes 1. The main body end of the draw-wire displacement sensor is connected to the head end of one of the two adjacent supporting pipes 1, and the rope end of the draw-wire displacement sensor is connected to the tail end of the other one of the two adjacent supporting pipes 1.

(14) Specifically, two draw-wire displacement sensors are arranged between adjacent supporting pipe 1. The main body end of one of the two draw-wire displacement sensor is connected to the axis position of the head end of one of the two adjacent supporting pipe 1, and a rope end of the rope displacement sensor is connected to the axis position of the tail end of the other adjacent supporting pipe 1. The main body end of the other rope displacement sensor is connected to the upper edge position of the head end of the adjacent supporting pipe 1, and the rope end of the other rope displacement sensor is connected to the upper edge position of the tail end of the other adjacent supporting pipe 1.

(15) One angle sensor 3 is arranged in each supporting pipe 1, and the angle sensor 3 is used to measure the angle of the supporting pipe 1 where the angle sensor 3 is located, which is the included angle between the axis of the supporting pipe 1 and the horizontal line.

(16) An hole sealing ring 5 is arranged in the circumferential direction of the head end and the tail end of each supporting pipe 1. Wherein the hole sealing ring 5 is made of soft material (rubber), so that the hole sealing ring 5 is closely attached to the supporting pipe 1 and the inner wall of the monitoring borehole 7. By sealing connection between the supporting pipe 1 and the inner wall of the monitoring borehole 7 with the hole sealing ring 5, an unenclosed space is formed between the supporting pipe 1, the inner wall of the monitoring borehole 7, and two the hole sealing rings 5.

(17) The grouting main pipe 6 passes through the interiors of each supporting pipe 1 and each connecting pipe 2, and two grouting branch pipes are arranged inside each supporting pipe 1. The two grouting branch pipes are arranged coaxially, and the grouting branch pipes are arranged perpendicular to the grouting main pipe 6. One end of the grouting branch pipe is communicated with the grouting main pipe 6, the other end of the grouting branch pipe is exposed from the side wall of the supporting pipe 1, and located between two hole sealing rings 5.

(18) The grouting unit is located in the gob-side entry 8, and is connected to the grouting main pipe 6 for injecting grout into the grouting main pipe 6 and the grouting branch pipe. When injecting grout into the grouting main pipe 6 and the grouting branch pipe by the grouting unit, the grout enters the enclosed space from the grouting branch pipe. After the grout solidifies, the grout fixes the supporting pipe 1 and the roof strata as a whole. In this way, the supporting pipe 1 can migrate and rotate along with the roof strata. Wherein two hole sealing rings 5 are used to confine the grout to the enclosed space on the circumferential outside of the supporting pipe 1, avoiding the grout from flowing to the position between adjacent supporting pipe 1, thereby preventing the connecting pipe 2 from being compressed, extended or bent caused by the grout solidification.

(19) The data acquisition unit is located in the gob-side entry 8, and the data acquisition unit is in signal connection with each displacement sensor 4 and each angle sensor 3, and is used for collecting distance data through the displacement sensor 4 and collecting angle data through the angle sensor 3. Wherein the data acquisition unit is capable of being connected to each displacement sensor 4 and each angle sensor 3 through signal cables, signal cables pass through the supporting pipe 1 and the connecting pipe 2.

(20) The grouting branch pipe is connected to the supporting pipe 1 through a plastic buckle, and under external force, the buckle can disengage from the supporting pipe 1. In this way, when it is necessary to remove the grouting main pipe 6 from the monitoring borehole 7, simply pull the grouting main pipe 6 outside the monitoring borehole 7 to detach the grouting main pipe 6 and the grouting branch pipe from the supporting pipe 1. This prevents the grouting main 6 from solidifying inside the supporting pipe 1 and the connecting pipe 2, and prevents the solidified grouting main pipe 6 from damaging the angle sensor 3 or the displacement sensor 4 during migration and rotation of the roof strata.

(21) A method for real-time monitoring the movement trajectory of mine roof strata, applying the device for real-time monitoring the movement trajectory of mine roof strata described in this embodiment, wherein the method including the following steps: Step 1: setting a coal column 9 on one side of the goaf 10 and setting a gob-side entry 8. Drilling holes in the goaf 10 or the roof strata of solid coal of the gob-side entry 8 or the top of working face to form monitoring borehole 7, and the drilling depth should reach key stratum 11. Step 2: determining the length of the connection between the supporting pipe 1 and the connecting pipe 2 based on the depth of the monitoring borehole 7. Pushing the supporting pipe 1 and the connecting pipe 2 connected in sequence into the monitoring borehole 7, and the hole sealing ring 5 is attached to the supporting pipe 1 and the inner wall of the monitoring borehole 7. Step 3: injecting grout from the grouting unit into the grouting main pipe 6 and the grouting branch pipe. The grout flows to the supporting pipe 1, the inner wall of the monitoring borehole 7, and the space between two the hole sealing rings 5. After the grouting is completed and before the grout solidifies, the grouting main pipe 6 is removed from the monitoring borehole 7. Step 4: After the grout 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 position and vertical position of any supporting pipe 1, and depicts the movement trajectory of roof strata by the real-time horizontal and vertical positions of each supporting pipe 1.

(22) In the step 4,

(23) The calculation formula for the horizontal position X.sub.n of any supporting pipe 1 is:

(24) $X_{n} = I \cos_{1} + d_{1} + I \cos_{2} + d_{2} .Math. + d_{(n - 1)} + \frac{1}{2} I \cos_{n};$

(25) In the formula: lthe length of the supporting pipe 1, in cm; .sub.1the angle of the first supporting pipe 1 measured by the angle sensor 3, in degrees; .sub.2the angle of the second supporting pipe 1 measured by the angle sensor 3, in degrees; .sub.nthe angle of the nth supporting pipe 1 measured by the angle sensor 3, in degrees; d.sub.1the projection value of the distance between the first supporting pipe 1 and the second supporting pipe 1 in the X direction measured by the displacement sensor 4, in cm; d.sub.2the projection value of the distance between the second supporting pipe 1 and the third supporting pipe 1 in the X direction measured by the displacement sensor 4, in cm; d.sub.(n-1)the projection value of the distance between the (n1)th supporting pipe 1 and the nth supporting pipe 1 measured by the displacement sensor 4 in the X direction, in cm;

(26) The calculation formula for the vertical position of any supporting pipe 1 is:

(27) $Y_{n} = I \sin_{1} + h_{1} + I \sin_{2} + h_{2} .Math. + h_{(n - 1)} + \frac{1}{2} I \sin_{n};$ lthe length of the supporting pipe 1, in cm; .sub.1the angle of the first supporting pipe 1 measured by the angle sensor 3, in degrees; .sub.2the angle of the second supporting pipe 1 measured by the angle sensor 3, in degrees; .sub.nthe angle of the nth supporting pipe 1 measured by the angle sensor 3, in degrees; h.sub.1the projection value of the distance between the first supporting pipe 1 and the second supporting pipe 1 in the Y direction measured by the displacement sensor 4, in cm; h.sub.2the projection value of the distance between the second supporting pipe 1 and the third supporting pipe 1 in the Y direction measured by the displacement sensor 4, in cm; h.sub.(n-1)the projection value of the distance between the (n1)th supporting pipe 1 and the nth supporting pipe 1 in the Y direction measured by the displacement sensor 4, in cm.

(28) Wherein, the specific calculation method for the relative position of adjacent supporting pipes 1 is:

(29) The specifications and dimensions of each supporting pipe 1 are the same. The angles of the supporting pipe i and the supporting pipe i+1 are measured by the angle sensor 3 as .sub.n-1 and .sub.n, and the radius of the supporting pipe 1 is r, as well as the distance between the supporting pipe i and the supporting pipe i+1 as L.sub.i and L.sub.i. Wherein the distance L.sub.i is measured by the draw-wire displacement sensor 4 connected the axial positions of the head end and the tail end of adjacent supporting pipes 1, and the distance L.sub.i is measured by the draw-wire displacement sensor 4 connected the upper edge positions of the head end and the tail end of adjacent supporting pipes 1.

(30) Assuming that the angles between two the draw-wire displacement sensors 4 and the horizontal direction are .sub.i and .sub.i, respectively, draw rectangles with the radii of the supporting pipe i and the supporting pipe i+1 and the ropes of two the draw-wire displacement sensors 4 as diagonals. According to the geometric relationship and trigonometric function relationship, the following formula can be obtain:
r cos .sub.nL.sub.i sin .sub.i=r cos .sub.n-1L.sub.i sin .sub.i;
L.sub.i cos .sub.ir sin .sub.n-1=L.sub.i cos .sub.ir sin .sub.n;

(31) Wherein rthe radius of the supporting pipe 1, in cm; L.sub.ithe length of the rope measured by the draw-wire displacement sensor 4 connected the axial positions of the head end and the tail end of adjacent supporting pipes 1, in cm; L.sub.ithe length of the rope measured by the draw-wire displacement sensor 4 connected the upper edge positions of the head end and the tail end of adjacent supporting pipes 1, in cm; .sub.n-1the angle of the (n1)th supporting pipe 1, in degrees; .sub.nthe angle of the nth supporting pipe 1, in degrees; .sub.ithe angle between the rope of the draw-wire displacement sensor 4 connected the axis position of the head end and tail end of the (n1)th supporting pipe 1 and the nth supporting pipe 1, and the horizontal direction, in degrees; .sub.ithe angle between the rope of the draw-wire displacement sensor 4 connected to the upper edge position of the head end and the tail end of the (n1)th supporting pipe 1 and the nth supporting pipe 1, and the horizontal direction, in degrees;

(32) According to the above two formulas, the angle .sub.i and .sub.i between the horizontal direction and the rope of the draw-wire displacement sensor 4 between the supporting pipe i and the supporting pipe i+1 can be obtained.

(33) So it can further obtain the following:

(34) The calculation formula for the projection value d.sub.(n-1) of the distance between the (n1)th supporting pipe 1 and the nth supporting pipe 1 in the X direction is:
d.sub.(n-1)=L.sub.i cos .sub.i; The calculation formula for the projection value h.sub.(n-1) of the distance between the (n1)th supporting pipe 1 and the nth supporting pipe 1 in the Y direction is:
h.sub.(n-1)=L.sub.i sin .sub.i.

(35) Thus, a detailed description of the embodiment has been provided in conjunction with the accompanying drawings. Based on the above description, technical personnel in this field should have a clear understanding of the device and the method for real-time monitoring the movement trajectory of mine roof strata of the present disclosure. The device for real-time monitoring the movement trajectory of mine roof strata of the present disclosure has fewer components, and the assembly process is simple and rapid during on-site use. It can be assembled and used according to the actual length of the monitoring borehole 7 in mining roof monitoring. The device for real-time monitoring the movement trajectory of mine roof strata of the present disclosure has a relatively simple structure, which is easy to process and manufacture, and uses fewer precision instruments inside. The precise instruments only include the angle sensor 3 and the displacement sensor 4, so that the overall cost of the device is relatively low, which can reduce the investment cost of mining monitoring. The device for real-time monitoring the movement trajectory of mine roof strata of the present disclosure is applied to monitor the mine roof strata in real time, the movement trajectory of mine roof strata can be monitored in real time, accurately and continuously, and more detailed strata information can be provided for disaster prevention and control such as mine pressure, strata control and rock burst.

(36) Certainly, the above descriptions are merely preferred embodiments of the present disclosure. The present disclosure is not limited to the above embodiments listed. It should be noted that, all equivalent replacements and obvious variations made by any person skilled in the art under the teaching of the specification fall within the essential scope of the specification and shall be protected by the present disclosure.

Device for real-time monitoring movement trajectory of mine roof strata and method thereof

Assignee

Inventors

Cpc classification

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E21D11/152

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Classification Explorer

E21F17/185

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E21B33/13

FIXED CONSTRUCTIONS

International classification

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E21B33/13

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Classification Explorer

E21D11/15

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Classification Explorer

E21F17/18

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Abstract

Claims

Description