Optical fiber monitoring system and method for horizontal deformation of deep overlying strata in mined-out subsidence area of coal mine

Abstract

The invention provides a coal mine mining subsidence area deep overlying strata horizontal deformation optical fiber monitoring system and method.The monitoring system comprises an oil pipe, an optical fiber conveying device and an optical fiber monitoring assembly, the oil pipe is arranged in a directional hole, the peripheral wall of the oil pipe is matched with the peripheral wall of the directional hole, and the optical fiber conveying device comprises a conveying body, a pressurizing piece and an optical fiber guiding plug; the conveying body is connected with an oil pipe, the optical fiber guiding plug is arranged in the conveying body, the pressurizing piece is connected with the conveying body and used for applying pressure into the conveying body so that the optical fiber guiding plug can be moved to the bottom of the oil pipe from the conveying body, and the optical fiber monitoring assembly comprises a monitoring piece and an optical fiber body. The optical fiber body is connected with the optical fiber guide plug and used for moving to the bottom of the oil pipe from the conveying body along with the optical fiber guide plug. The monitoring system has the advantages of comprehensive monitoring data, good stability and high data accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber monitoring of coal mine goaf areas, and in particular to an optical fiber monitoring system and method for horizontal deformation of deep overburden in coal mine goaf subsidence areas. Background Art

[0002] The high-intensity mining of coal resources has formed large-scale mining subsidence areas. As a large number of infrastructure constructions such as roads, railways, bridges, tunnels, reservoirs and dams, power plants, coal preparation plants, coal mine industrial sites, high-rise and super-high-rise buildings have to be built in mining subsidence areas, it is a very important work content to use deep rock strata monitoring technology in mining subsidence areas to judge the stability of mining subsidence and evaluate the quality of control projects.

[0003] In the related technologies, the monitoring of mining subsidence areas mainly adopts monitoring methods such as inclinometers, displacement meters and optical fiber monitoring. Among them, the application of optical fiber monitoring realizes the use of vertical drilling in mining subsidence areas to obtain the deformation of the overburden in the vertical full section. However, since vertical drilling optical fiber monitoring only solves the vertical deformation of a certain point or a few points on the site, it is impossible to obtain the change law of the horizontal deformation of the overburden rock mass settlement in the horizontal full section plane direction within the scope of the building (structure) site. Therefore, it is impossible to effectively realize the monitoring of the overburden deformation in the mining subsidence area, and it is also impossible to obtain the spatial deformation law of the underlying rock mass on the site. There is also a defect of low monitoring level of the deep overburden rock in the mining subsidence. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention provides a fiber optic monitoring system and method for horizontal deformation of deep overburden in coal mine goaf collapse areas. The monitoring system has the advantages of comprehensive monitoring data, good stability, and high data accuracy.

[0006] The optical fiber monitoring system for horizontal deformation of deep overburden in coal mine goaf subsidence area according to an embodiment of the present invention comprises:

[0007] An oil pipe, the oil pipe is placed in the directional hole, and the outer peripheral wall of the oil pipe is adapted to the peripheral wall of the directional hole;

[0008] An optical fiber delivery device, the optical fiber delivery device comprising a delivery body, a pressure member and an optical fiber guide plug, the delivery body being connected to the oil pipe, the optical fiber guide plug being placed in the delivery body, the pressure member being connected to the delivery body, and the pressure member being used to apply pressure to the delivery body to move the optical fiber guide plug from the delivery body to the bottom of the oil pipe;

[0009] An optical fiber monitoring assembly, the optical fiber monitoring assembly includes a monitoring component and an optical fiber body, the monitoring component is connected to the optical fiber body, the optical fiber body is connected to the optical fiber guide plug, and the optical fiber body is used to follow the optical fiber guide plug to move from the conveying body to the bottom of the oil pipe.

[0010] The optical fiber monitoring system for horizontal deformation of deep overburden in coal mine goaf subsidence area of ​​the embodiment of the present invention can obtain deformation data of overburden in vertical and horizontal sections in the entire borehole through the optical fiber monitoring component, overcoming the limitation that traditional monitoring means can only monitor a certain point or a few points. It can also monitor the spatial deformation law of overburden rock mass in real time, providing more accurate data for evaluating the stability of goaf subsidence area.

[0011] In some embodiments, the optical fiber delivery device further comprises an extension tube, a first end of which is connected to the delivery body, a second end of which is disposed in the directional hole, and an empty end of the oil pipe adjacent to the directional hole is disposed in the extension tube.

[0012] In some embodiments, the optical fiber delivery device further comprises a sealing member disposed between the inner circumferential wall of the extension tube and the outer circumferential wall of the oil pipe, the sealing member being used for the gap between the inner circumferential wall of the extension tube and the outer circumferential wall of the oil pipe.

[0013] In some embodiments, the delivery body has a pressurized chamber, the pressurizing member is connected to the pressurized chamber for injecting a pressurized object into the pressurized chamber, and the optical fiber body passes through the pressurized chamber and is connected to the optical fiber guide plug.

[0014] In some embodiments, the optical fiber monitoring assembly further includes a check valve, wherein the check valve is connected to the delivery body, and the optical fiber body passes through the check valve and is connected to the optical fiber guide plug.

[0015] In some embodiments, the optical fiber monitoring assembly also includes a lubricant and a limiter, the lubricant is connected between the check valve and the conveying body, the limiter is connected to the conveying body and is located in the pressurized chamber, the limiter and the check valve are arranged at intervals in the height direction of the conveying body, and the optical fiber body sequentially passes through the lubricant, the check valve and the limiter and is connected to the optical fiber guide plug.

[0016] The optical fiber monitoring method for horizontal deformation of deep overburden in coal mine goaf subsidence area according to the embodiment of the present invention is implemented by using the optical fiber monitoring system for horizontal deformation of deep overburden in coal mine goaf subsidence area according to any one of the above embodiments, and comprises the following steps:

[0017] S1. Lower the oil pipe into the directional drilling hole;

[0018] S2, connecting the optical fiber delivery device to the oil pipe orifice, connecting the optical fiber body to the optical fiber guide plug, and then placing the optical fiber guide plug in the oil pipe;

[0019] S3, using a pressurizing member to introduce a pressurized substance into the conveying body, so that the optical fiber guide plug moves along the oil pipe to the bottom of the directional drilling hole under the action of pressure;

[0020] S4, pull out the oil pipe;

[0021] S5, preparing grouting slurry;

[0022] S6. Dismantle the optical fiber delivery device, inject grouting liquid, and then seal the hole.

[0023] In some embodiments, the optical fiber monitoring method for horizontal deformation of deep overburden in coal mine goaf subsidence area of ​​the embodiment of the present invention further comprises the following steps:

[0024] Before step S1, a directional borehole is drilled, a pipe sleeve is lowered, and grouting is performed around the pipe sleeve to seal the pipe sleeve.

[0025] In some embodiments, in step S3, before the pressure substance is introduced into the delivery body, a sealing member is used to seal the gap between the oil pipe and the extension tube of the optical fiber delivery device.

[0026] In some embodiments, in step S3, the pressure member is controlled so that the moving speed of the optical fiber guide plug is greater than or equal to 0.1 m / s and less than or equal to 0.5 m / s. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a fiber optic monitoring system for horizontal deformation of deep overburden in a coal mine goaf subsidence area according to an embodiment of the present invention.

[0028] Figure 2 yes Figure 1 An enlarged schematic diagram of A is shown in FIG.

[0029] Figure 3 It is a schematic diagram of the connection of the optical fiber guide plug of the optical fiber monitoring system for horizontal deformation of deep overburden in coal mine goaf subsidence area according to an embodiment of the present invention.

[0030] Figure 4 It is a schematic diagram of the construction environment of the optical fiber monitoring system for horizontal deformation of deep overburden in coal mine goaf subsidence area according to an embodiment of the present invention.

[0031] Reference numerals:

[0032] 100, directional drilling, 200, collapse zone, 300, fracture zone, 400, surface,

[0033] 1. YouTube,

[0034] 2. Optical fiber delivery device, 21. Delivery body, 22. Pressurizing member, 23. Optical fiber guide plug, 231. Connecting ring, 24. Extension tube, 25. Blocking member, 26. Pressurizing chamber, 27. Check valve, 28. Lubricating member, 29. Stopper,

[0035] 3. Optical fiber monitoring assembly, 31. Monitoring component, 32. Optical fiber body. DETAILED DESCRIPTION

[0036] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0037] The optical fiber monitoring system for horizontal deformation of deep overburden in coal mine goaf subsidence area according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0038] like Figure 1-Figure 4 As shown, the optical fiber monitoring system for horizontal deformation of deep overburden in coal mine goaf subsidence area according to the embodiment of the present invention comprises: an oil pipe 1, an optical fiber transmission device 2 and an optical fiber monitoring component 3.

[0039] The oil pipe 1 is placed in the directional hole, and the outer peripheral wall of the oil pipe 1 is matched with the peripheral wall of the directional hole. The optical fiber delivery device 2 includes a delivery body 21, a pressure member 22 and an optical fiber guide plug 23. The delivery body 21 is connected to the oil pipe 1. The optical fiber guide plug 23 is placed in the delivery body 21. The pressure member 22 is connected to the delivery body 21. The pressure member 22 is used to apply pressure to the delivery body 21 to move the optical fiber guide plug 23 from the delivery body 21 to the bottom of the oil pipe 1. The optical fiber monitoring assembly 3 includes a monitoring member 31 and an optical fiber body 32. The monitoring member 31 is connected to the optical fiber body 32. The optical fiber body 32 is connected to the optical fiber guide plug 23. The optical fiber body 32 is used to follow the optical fiber guide plug 23 from the delivery body 21 to the bottom of the oil pipe 1.

[0040] Specifically, Figure 1-Figure 3 As shown, the extension direction of the oil pipe 1 is consistent with that of the directional hole, and the outer peripheral wall of the oil pipe 1 is adapted to the wall surface of the directional hole, so that the oil pipe 1 can be placed in the directional hole. The conveying body 21 is connected to the pipe mouth of the oil pipe 1, and the pressure member 22 is connected to the conveying body 21, so that the pressure member 22 is activated and can convey pressure material into the oil pipe 1 through the conveying body 21. The optical fiber guide plug 23 is placed in the oil pipe 1, and the optical fiber guide plug 23 is connected to the optical fiber body 32, so that the optical fiber guide plug 23 can move along the oil pipe 1 under the pressure in the conveying body 21, thereby driving the optical fiber body 32 to move, thereby conveying the optical fiber body 32 to the bottom of the directional hole, so as to monitor the horizontal deformation of the deep overburden in the goaf collapse area.

[0041] It is understandable that if Figure 1-Figure 3As shown, the pressure member 22 can pass high-pressure gas or high-pressure liquid into the conveying body 21, so as to drive the optical fiber guide plug 23 to move along the oil pipe 1. That is, the pressure member 22 can be an air pump or a water pump, so as to pass high-pressure gas or high-pressure liquid into the conveying body 21. When the optical fiber guide plug 23 moves to the bottom of the directional borehole, the oil pipe 1 is pulled out, and the directional borehole is grout-sealed so that the optical fiber body 32 can be fixed in the directional borehole, so that the monitoring member 31 can determine the deformation of the deep overburden in the empty collapse area according to the internal signal change of the optical fiber body 32.

[0042] It should be noted that the monitoring element 31 includes an optical fiber sensor, that is, an optical signal is transmitted to the inside of the borehole through an optical fiber, and a sensor that can emit and receive light is equipped at the end of the optical fiber. When the light encounters the wall of the hole or the material in the hole, it will be reflected back. By analyzing the intensity, phase, wavelength and other information of the reflected light, the physical and chemical state inside the borehole can be monitored. Figure 1-Figure 3 As shown, the optical fiber guide plug 23 has a connecting ring 231, and the optical fiber body 32 is connected to the optical fiber guide plug 23 through the connecting ring 231, that is, one end of the optical fiber body 32 is connected to the monitoring component 31, and the other end of the optical fiber body 32 passes through the connecting ring 231 on the optical fiber guide plug 23 and then is connected to the monitoring component 31, thereby realizing a closed-loop connection of the optical fiber body 32 for subsequent monitoring.

[0043] Optionally, the fiber optic monitoring component 3 includes distributed optical fiber and fixed-point optical fiber, that is, the distributed optical fiber can be used to carry out long-distance, large-scale, and continuous monitoring of deep overburden in coal mine subsidence areas, and the fixed-point optical fiber sensing technology can ensure high-precision and local monitoring capabilities in different usage scenarios.

[0044] That is to say, the optical fiber monitoring system for horizontal deformation of deep overburden in coal mine goaf subsidence area of ​​the embodiment of the present invention can obtain deformation data of overburden in vertical and horizontal sections in the entire borehole through the optical fiber monitoring component 3, overcoming the limitation that traditional monitoring means can only monitor a certain point or a few points. It can also monitor the spatial deformation law of overburden rock mass in real time, providing more accurate data for evaluating the stability of goaf subsidence area.

[0045] In some embodiments, the optical fiber delivery device 2 further includes an extension tube 24 , a first end of which is connected to the delivery body 21 , a second end of which is placed in the directional hole, and an empty end of the oil pipe 1 adjacent to the directional hole is placed in the extension tube 24 .

[0046] Specifically, Figure 1-Figure 3 As shown, the upper end of the extension tube 24 is connected to the conveying body 21, and the lower end of the extension tube 24 is placed in the directional hole. The upper end of the oil pipe 1 is placed in the extension tube 24 to provide a guiding channel for the oil pipe 1.

[0047] It is understandable that the extension tube 24 is connected to the delivery body 21 and forms a continuous channel, so that the extension tube 24 can provide a more accurate guide channel for the optical fiber guide plug 23, ensuring that the optical fiber guide plug 23 can accurately move to the bottom of the oil pipe 1 along the predetermined path. In addition, the extension tube 24 can fill the gap between the oil pipe 1 and the directional drilling hole, improve the stability of the oil pipe 1, and avoid friction damage to the optical fiber body 32 due to the shaking of the oil pipe 1 during the delivery of the optical fiber.

[0048] In some embodiments, the optical fiber delivery device 2 further includes a sealing member 25 , which is disposed between the inner circumferential wall of the extension tube 24 and the outer circumferential wall of the oil pipe 1 , and is used to fill the gap between the inner circumferential wall of the extension tube 24 and the outer circumferential wall of the oil pipe 1 .

[0049] Specifically, Figure 1-Figure 3 As shown, the sealing member 25 is an annular member, and parts of the sealing member 25 can be placed in the gap between the inner circumferential wall of the extension tube 24 and the outer circumferential wall of the oil pipe 1, thereby avoiding the existence of a gap between the extension tube 24 and the oil pipe 1, avoiding leakage of the pressure object, and ensuring the movement of the optical fiber guide plug 23.

[0050] It should be noted that the plugging member 25 can be made of rubber material so as to adapt to different diameters of the oil pipe 1 and the extension pipe 24, thereby increasing the compatibility and flexibility of the system. In addition, the plugging member 25 blocks the gap between the oil pipe 1 and the extension pipe 24, thereby improving the sealing between the delivery body 21 and the oil pipe 1, thereby reducing the interference of the external environment on the monitoring system, and helping to improve the accuracy and reliability of the monitoring data.

[0051] In some embodiments, the delivery body 21 has a pressurized chamber 26 , the pressurizing member 22 is connected to the pressurized chamber 26 for injecting a pressurized object into the pressurized chamber 26 , and the optical fiber body 32 passes through the pressurized chamber 26 and is connected to the optical fiber guide plug 23 .

[0052] It is understandable that if Figure 1-Figure 3 As shown, the conveying body 21 contains a pressurized chamber 26, which is used to accommodate the pressure object (such as liquid or gas) discharged by the pressurizing member 22 so as to generate a driving force for driving the optical fiber guide plug 23. The optical fiber body 32 can penetrate the wall of the conveying body 21 and the pressurized chamber 26 from the outside of the conveying body 21 and connect with the optical fiber guide plug 23 to avoid the pressure object affecting the monitoring member 31 during the process of conveying the optical fiber, thereby ensuring the monitoring result.

[0053] It should be noted that a control valve may be provided at the entrance of the pressurized chamber 26 to allow accurate control of the pressure of the injected pressure object, thereby accurately controlling the moving speed and position of the optical fiber guide plug 23. Of course, the design of the pressurized chamber 26 and the pressurized member 22 can adjust the pressure as needed to meet the monitoring requirements of different depths and geological conditions.

[0054] In some embodiments, the optical fiber monitoring assembly 3 further includes a check valve 27 , which is connected to the delivery body 21 , and the optical fiber body 32 passes through the check valve 27 and is connected to the optical fiber guide plug 23 .

[0055] It is understandable that if Figure 1-Figure 3 As shown, the check valve 27 is located at the top of the conveying body 21, and there are two check valves 27. One end of the optical fiber body 32 passes through one check valve 27 in turn, then passes through the connecting ring 231 on the optical fiber guide plug 23, and then passes through another check valve 27 to be connected to the monitoring component 31, thereby ensuring the overall sealing performance of the conveying body 21.

[0056] That is to say, the check valve 27 can prevent the fluid in the oil pipe 1 from flowing back into the conveying body 21 when the pressurization stops or the equipment fails, thereby protecting the optical fiber body 32 and the monitoring equipment. In addition, in an emergency, the check valve 27 can quickly cut off the fluid channel to improve the safety of the system. Preferably, the ratio of the length of the check valve 27 to the width of the check valve 27 is greater than or equal to 1 and less than or equal to 3, so that the check valve 27 has a certain buffer margin to prevent backflow under the action of the pressure object, ensuring that the check valve can quickly cut off the fluid channel in an emergency, avoiding leakage of the pressure object in the conveying body 21, and further improving the safety of the system.

[0057] In some embodiments, the optical fiber monitoring assembly 3 also includes a lubricant 28 and a limiter 29. The lubricant 28 is connected between the check valve 27 and the conveying body 21. The limiter 29 is connected to the conveying body 21 and is located in the pressurized chamber 26. The limiter 29 and the check valve 27 are arranged at intervals in the height direction of the conveying body 21. The optical fiber body 32 passes through the lubricant 28, the check valve 27 and the limiter 29 in sequence and is connected to the optical fiber guide plug 23.

[0058] It can be understood that, as shown in the figure, the lubricating member 28 is placed between the check valve 27 and the conveying body 21, and there are two lubricating members 28, and the two lubricating members 28 correspond to the two check valves 27 one by one. That is to say, when in use, one end of the optical fiber body 32 needs to pass through one of the lubricating members 28, the check valve, the stopper 29, the connecting ring 231, the stopper 29, another check valve and another lubricating member 28 in sequence. Among them, the stopper 29 can separate the optical fibers to prevent the optical fibers from being knotted or entangled during movement, so as to ensure that the optical fiber body 32 always maintains the correct position during the conveying process and limits its range of movement. Improve construction efficiency.

[0059] That is, the lubricating member 28 can lubricate the outer peripheral wall of the optical fiber body 32 to reduce the contact pressure between the optical fiber body 32 and the internal components of the delivery body 21, thereby reducing the risk of damage to the optical fiber. The design of the stopper 29 can ensure the precise position control of the optical fiber body 32 during the delivery process, thereby preventing the optical fiber body 32 from deviating from the predetermined path.

[0060] The following describes the optical fiber monitoring method for horizontal deformation of deep overburden in coal mine goaf collapse area according to the embodiment of the present invention.

[0061] The optical fiber monitoring method for horizontal deformation of deep overburden in coal mine goaf subsidence area of ​​the embodiment of the present invention is implemented by using the optical fiber monitoring system for horizontal deformation of deep overburden in coal mine goaf subsidence area of ​​any one of the above embodiments, and comprises the following steps:

[0062] S1. Lower the oil pipe 1 into the directional borehole. It should be noted that in order to better implement the optical fiber monitoring method for horizontal deformation of deep overburden in coal mine goaf subsidence area of ​​the embodiment of the present invention, it is also necessary to design the hole structure of the directional hole, the selection of drilling layer and the wellbore. That is, the horizontal layer layout of the directional drilling should be comprehensively selected in combination with the burial depth of the goaf, mining conditions, lithology and mechanical characteristics of the overburden strata. Preferably, it is set in the caving zone and the water-conducting fracture zone 300. The wellbore design includes the borehole opening diameter, drilling trajectory, variable diameter layer, target position, casing specifications, and cementing materials.

[0063] In addition, based on the deep overburden in the coal mine goaf collapse area, the construction of directional holes also includes the following steps, namely, building a drilling site at a suitable location on the ground, using a rotary drill to 8 to 10 meters below the bedrock, retracting the drill, expanding the hole to the bottom of the hole and inserting the casing, grouting and sealing the pipe, waiting for the slurry to solidify, completing the first branch hole inclination section and near-horizontal section drilling according to the drilling trajectory, retracting the drill, cleaning the hole, and continuing to complete the drilling of the second branch hole. During the drilling process, if the circulating fluid is lost, cement slurry needs to be injected to plug the leak, and after the slurry solidifies, the hole is swept and drilled again.

[0064] like Figure 4As shown, the directional hole includes a vertical section, a deflection section and a horizontal section (i.e., a horizontal branch hole) connected in sequence, wherein the opening of the vertical section is set at the surface 400, and multiple horizontal branch holes are connected to the vertical section through the deflection section. Figure 4 As shown, two horizontal branch holes are taken as an example, that is, the first horizontal branch hole is set in the goaf collapse zone 200, and the second horizontal branch hole is set in the goaf fracture zone 300, and the first horizontal branch hole is located 3 to 5 meters above the top plate of the goaf collapse zone, and the second horizontal branch hole is located 5 to 30 meters above the top of the collapse zone 200. Of course, the horizontal directional drilling layer can be increased according to the actual situation. It should be noted that the lithology of the drilling layer is preferably a hard rock layer such as sandstone and conglomerate.

[0065] In some embodiments, the optical fiber monitoring method for horizontal deformation of deep overburden in coal mine subsidence area of ​​the embodiment of the present invention also includes the following steps: before step S1, a directional borehole is drilled, and a pipe sleeve is lowered, and grouting is performed around the pipe sleeve to seal it.

[0066] It is understandable that after the sleeve is lowered into the borehole, grouting is performed on the surrounding side. The purpose of grouting is to fix the sleeve to prevent it from moving under the pressure of the underground rock formation, and also to prevent groundwater or other substances from invading the borehole and affecting the effect of optical fiber monitoring. In addition, the sleeve can also provide effective support for the extension tube 24, reducing the possibility of collapse of the hole wall of the directional hole during the optical fiber transmission process.

[0067] S2, connecting the optical fiber delivery device 2 to the opening of the oil pipe 1, and after the optical fiber body 32 is connected to the optical fiber guide plug 23, the optical fiber guide plug 23 is placed in the oil pipe 1.

[0068] S3. Use the pressure member 22 to introduce pressure material into the conveying body 21, so that the optical fiber guide plug 23 moves along the oil pipe 1 to the bottom of the directional drilling hole under the action of pressure.

[0069] In some embodiments, in step S3 , before the pressure substance is introduced into the delivery body 21 , the gap between the oil pipe 1 and the extension tube 24 of the optical fiber delivery device 2 is sealed by the sealing member 25 .

[0070] In some embodiments, in step S3 , the pressure member 22 is controlled so that the moving speed of the optical fiber guide plug 23 is greater than or equal to 0.1 m / s and less than or equal to 0.5 m / s.

[0071] It is understandable that the moving speed of the optical fiber body 32 can be expressed by the following formula:

[0072] Q=v·A,A=πr 2, where v is the water flow velocity, A is the pipe area, and r is the pipe inner diameter. That is to say, for a certain pipe diameter, the flow velocity can be adjusted by controlling the flow rate to ensure that the optical fiber body 32 can move smoothly to the bottom of the directional hole 100 to avoid the optical fiber body 32 being torn off.

[0073] S4. Pull out the oil pipe.

[0074] S5. Prepare grouting slurry.

[0075] Optionally, the grouting slurry base material is cement slurry, that is, the slurry modulus is adjusted by adding a certain proportion of gypsum or bentonite. The water-to-solid ratio of the grouting slurry is preferably 1:1.5-1.2:1, and the solid ratio is preferably cement: gypsum / bentonite=1:0-1:1. In addition, the grouting slurry needs to be returned from the orifice.

[0076] S6. Dismantle the optical fiber delivery device, inject grouting liquid, and then seal the hole.

[0077] Therefore, the optical fiber deformation monitoring method for deep overburden in coal mine goaf subsidence area of ​​the embodiment of the present invention combines the residual deformation distribution characteristics of the caving zone and water-conducting fracture zone of the goaf subsidence stratum, the horizontal directional hole construction technology and the optical fiber deformation monitoring characteristics, and designs an idea of ​​monitoring the overburden deformation in the goaf subsidence area by burying optical fiber through horizontal directional drilling, and proposes a method and process for horizontal drilling layout, drilling and optical fiber burying, which can effectively solve the current vertical line monitoring of overburden deformation in goaf subsidence area, and cannot obtain the spatial deformation law of the underlying rock mass in the site, thereby improving the level of overburden deformation monitoring in deep goaf subsidence.

[0078] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0079] 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.

[0080] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0081] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0082] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean 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 described specific features, structures, materials or characteristics 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.

[0083] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A fiber optic monitoring system for horizontal deformation of deep overburden in coal mine goaf subsidence area, characterized in that: include: An oil pipe, the oil pipe is placed in the directional hole, and the outer peripheral wall of the oil pipe is adapted to the peripheral wall of the directional hole; An optical fiber delivery device, the optical fiber delivery device comprising a delivery body, a pressure member and an optical fiber guide plug, the delivery body being connected to the oil pipe, the optical fiber guide plug being placed in the delivery body, the pressure member being connected to the delivery body, and the pressure member being used to apply pressure to the delivery body to move the optical fiber guide plug from the delivery body to the bottom of the oil pipe; An optical fiber monitoring assembly, the optical fiber monitoring assembly includes a monitoring component and an optical fiber body, the monitoring component is connected to the optical fiber body, the optical fiber body is connected to the optical fiber guide plug, and the optical fiber body is used to follow the optical fiber guide plug to move from the conveying body to the bottom of the oil pipe.

2. The optical fiber monitoring system for horizontal deformation of deep overburden in coal mine goaf subsidence area according to claim 1 is characterized in that: The optical fiber delivery device also includes an extension tube, a first end of which is connected to the delivery body, a second end of which is placed in the directional hole, and an empty end of the oil pipe adjacent to the directional hole is placed in the extension tube.

3. The optical fiber monitoring system for horizontal deformation of deep overburden in coal mine goaf subsidence area according to claim 2 is characterized in that: The optical fiber delivery device further comprises a plugging member, which is placed between the inner circumferential wall of the extension tube and the outer circumferential wall of the oil pipe, and is used for the gap between the inner circumferential wall of the extension tube and the outer circumferential wall of the oil pipe.

4. The optical fiber monitoring system for horizontal deformation of deep overburden in coal mine goaf subsidence area according to claim 3 is characterized in that: The conveying body has a pressurized chamber, the pressurizing member is connected to the pressurized chamber for injecting a pressurized object into the pressurized chamber, and the optical fiber body penetrates the pressurized chamber and is connected to the optical fiber guide plug.

5. The optical fiber monitoring system for horizontal deformation of deep overburden in coal mine goaf subsidence area according to claim 4 is characterized in that: The optical fiber monitoring assembly further includes a check valve, which is connected to the delivery body, and the optical fiber body passes through the check valve and is connected to the optical fiber guide plug.

6. The optical fiber monitoring system for horizontal deformation of deep overburden in coal mine goaf subsidence area according to claim 5 is characterized in that: The optical fiber monitoring assembly also includes a lubricating member and a limiter, the lubricating member is connected between the check valve and the conveying body, the limiter is connected to the conveying body and is located in the pressurized chamber, the limiter and the check valve are arranged at intervals in the height direction of the conveying body, and the optical fiber body sequentially passes through the lubricating member, the check valve and the limiter and is connected to the optical fiber guide plug.

7. A method for optical fiber monitoring horizontal deformation of deep overburden in coal mine goaf subsidence area, the monitoring method is implemented by using the optical fiber monitoring system for horizontal deformation of deep overburden in coal mine goaf subsidence area according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Lower the oil pipe into the directional drilling hole; S2, connecting the optical fiber delivery device to the oil pipe orifice, connecting the optical fiber body to the optical fiber guide plug, and then placing the optical fiber guide plug in the oil pipe; S3, using a pressurizing member to introduce a pressurized substance into the conveying body, so that the optical fiber guide plug moves along the oil pipe to the bottom of the directional drilling hole under the action of pressure; S4, pull out the oil pipe; S5, preparing grouting slurry; S6. Dismantle the optical fiber delivery device, inject grouting liquid, and then seal the hole.

8. The optical fiber monitoring method for horizontal deformation of deep overburden in coal mine goaf subsidence area according to claim 7 is characterized in that: The following steps are also included: Before step S1, a directional borehole is drilled, a pipe sleeve is lowered, and grouting is performed around the pipe sleeve to seal the pipe sleeve.

9. The optical fiber monitoring method for horizontal deformation of deep overburden in coal mine goaf subsidence area according to claim 8 is characterized in that: In step S3, before the pressure substance is introduced into the delivery body, the gap between the oil pipe and the extension pipe of the optical fiber delivery device is sealed by a sealing member.

10. The optical fiber monitoring method for horizontal deformation of deep overburden in coal mine goaf subsidence area according to claim 9, characterized in that: In step S3, the pressure member is controlled so that the moving speed of the optical fiber guide plug is greater than or equal to 0.1 m / s and less than or equal to 0.5 m / s.

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