A device for monitoring displacement of a slope

Abstract

The application discloses a kind of slope displacement monitoring devices, it is related to slope displacement monitoring technical field, including the borehole of distribution setting in grid support surface, borehole distribution setting in the grid center position of grid support, detection rod assembly is arranged in borehole, detection rod assembly is connected with displacement sensor, surface detection assembly is arranged on grid support, and the center of surface detection assembly is connected with detection rod assembly;Detection rod assembly includes combination cylinder one and multiple combination cylinder two, combination cylinder one and combination cylinder two are elastic material, combination cylinder one and combination cylinder two are connected head to tail between and adjacent combination cylinder two, combination cylinder one is coaxially provided with fiber bragg grating in and fiber bragg grating extends into combination cylinder two, combination cylinder one and combination cylinder two are provided with leak hole on side wall, and the inside of detection rod assembly that combination cylinder one and combination cylinder two are made is filled with elastic material, and fiber bragg grating encapsulated by elastic material realizes to the displacement in the inside of slope is monitored in real time.

Description

Technical Field

[0001] This invention relates to the field of slope displacement monitoring technology, specifically a slope displacement monitoring device. Background Technology

[0002] Slope protection typically involves forming a grid-like structure to cover and protect the slope surface. However, even with this grid-like protection, the internal structure of the slope remains largely separate from the grid support itself. The grid support primarily restricts soil erosion at the slope surface, but its protective effect on the internal slope is significantly lower than that on the surface. Over time, the internal slope often experiences stratified displacement compared to the surface. Specifically, some areas may have intact surface grid support structures, while the internal slope may experience collapse, spalling, soil erosion, and other structural damage, leading to slope protection failure and roadbed instability. Therefore, there is an urgent need for a slope displacement monitoring device to monitor displacement at different depths within the slope, ensuring the overall reliability of the slope protection. Summary of the Invention

[0003] The purpose of this invention is to provide a slope displacement monitoring device to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A slope displacement monitoring device includes boreholes distributed on the slope surface, the boreholes being located at the center of a grid support, a detection rod assembly being installed in each borehole, the detection rod assembly being connected to a displacement sensor, and a surface detection assembly being installed on the grid support, the center of the surface detection assembly being connected to the detection rod assembly.

[0006] The detection rod assembly includes a first combined cylinder and multiple second combined cylinders. The first and second combined cylinders are made of elastic material. The first and second combined cylinders, as well as adjacent second combined cylinders, are connected end to end. A fiber optic grating is coaxially arranged inside the first combined cylinder and extends into the second combined cylinder. Leakage holes are provided on the side walls of the first and second combined cylinders. The detection rod assembly composed of the first and second combined cylinders is filled with elastic material. The fiber optic grating is located at the center of the first and second combined cylinders and is encapsulated by the filled elastic material.

[0007] As a further embodiment of the present invention: a positioning cylinder is installed inside the drill hole, and a material injection groove is evenly provided on the side wall of the positioning cylinder. The material injection groove is parallel to the axis of the positioning cylinder and extends to the bottom end of the positioning cylinder. The leakage holes on the side walls of the first and second combined cylinders are provided corresponding to the material injection grooves.

[0008] As a further embodiment of the present invention: the upper end of the positioning cylinder is provided with a positioning hole one, the upper end of the combined cylinder one is provided with a positioning hole two, and the positioning hole one, the positioning hole two, and the injection groove correspond to each other.

[0009] As a further embodiment of the present invention: the edge of the positioning cylinder is provided with a disassembly groove, the positioning hole is provided through, and the positioning cylinder is fixedly installed to the edge of the drill hole through the positioning hole.

[0010] As a further embodiment of the present invention: mounting holes are provided on the side walls of the first and second combined cylinders, a positioning ring is sleeved on the outer side of the fiber optic grating, a positioning screw is provided at the mounting hole, and the positioning ring is connected to the first and second combined cylinders through the positioning screw.

[0011] As a further embodiment of the present invention: the connection between the inner ring of the positioning ring and the fiber optic grating is provided with a rounded chamfer, and the positioning ring is provided with a filling hole.

[0012] As a further embodiment of the present invention: the end of the first combined cylinder is provided with an internal thread, and the two ends of the second combined cylinder are respectively provided with an internal thread and an external thread. The first combined cylinder and the second combined cylinder, as well as multiple second combined cylinders, are connected by internal and external threads. A connecting spring is also provided between the first combined cylinder and the second combined cylinder, as well as between multiple second combined cylinders. Multiple spring rods are embedded in the internal thread portion of the first combined cylinder and the second combined cylinder.

[0013] As a further embodiment of the present invention: a plug is provided at the end of the first combined cylinder, and a mounting plug and a connecting thread are respectively provided on both sides of the plug. The mounting plug is connected to the end of the first combined cylinder, and the plug is connected to the surface detection component through the connecting thread.

[0014] As a further embodiment of the present invention: the surface detection component includes a central ring, the inner ring of which is provided with a sealing nut, the sealing nut engaging with a connecting thread, the sealing nut having a mating hole, the side of the central ring having a sliding groove, the sliding groove containing a plurality of mating sliders, the mating sliders being connected to a sliding rod, the apex of the grid support being rotatably mounted with a plug-in cylinder, the sliding rod and the plug-in cylinder being interlocked, and the fiber grating passing through the sealing nut and connected to a central positioning component.

[0015] As a further embodiment of the present invention: the central positioning component includes a fixed frame disposed on the grid support surface, a central positioning disk disposed at the center of the fixed frame, the fiber optic grating passing through the central positioning disk and connected to a sensor connector, and the sensor connector being connected to a displacement sensor.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] (1) A frame structure for the detection rod assembly is formed by connecting the first combination cylinder and multiple second combination cylinders end to end. Then, the fiber optic grating used for displacement detection is inserted into the detection rod assembly through the end. It should be noted that the surface of the fiber optic grating and the interior of the detection rod assembly are installed in a non-fixed manner. This can avoid the fiber optic grating from breaking due to deformation and stretching of the detection rod assembly when displacement occurs inside the slope.

[0018] (2) After the detection rod assembly is inserted into the borehole and installed, elastic material is poured into the detection rod assembly. After the elastic material solidifies, it forms a sealed protection for the fiber optic grating. When displacement occurs inside the slope, it causes the detection rod assembly to bend as a whole. Combined with the fiber optic grating, the displacement can be detected in real time.

[0019] (3) After drilling is completed, a positioning cylinder is inserted into the borehole. In order to ensure that the detection rod assembly still maintains the initial installation posture between the positioning cylinder and the borehole after the positioning cylinder is removed, multiple injection grooves are opened on the side wall of the positioning cylinder. The leakage holes opened on the side walls of combined cylinder one and combined cylinder two are directly opposite the injection grooves, so that the detection rod assembly is also filled with elastic material in the injection groove to form support. After the positioning cylinder is removed, elastic material is continued to be injected into the borehole so that the cavity left by the removal of the positioning cylinder continues to be filled with elastic material, thus protecting the detection rod assembly as a whole.

[0020] (4) By setting a central positioning component between the grid supports, after the detection rod component and the surface detection component are installed, the fiber optic grating extends to the center of the central positioning disk. When the slope surface displaces, the fiber optic grating between the central positioning disk and the end of the detection rod component will deform accordingly, thereby realizing the measurement of the slope surface displacement. Combined with the fiber optic grating, the entire slope can be monitored and the displacement recorded in real time. The detection rod components distributed between the grid supports can detect the displacement of the entire slope and construct a displacement model, thereby intuitively displaying the displacement changes inside the slope. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the installation structure between the present invention and the grid support.

[0022] Figure 2 This is a schematic diagram of the overall structure of the present invention.

[0023] Figure 3 This is a schematic diagram of the detection rod assembly in this invention.

[0024] Figure 4 for Figure 3 Enlarged structural diagram at point A in the middle.

[0025] Figure 5 This is a schematic diagram of the cross-sectional structure of the combined cylinder one in this invention.

[0026] Figure 6 This is a schematic diagram of the cross-sectional structure of the combined cylinder two in this invention.

[0027] Figure 7 This is a cross-sectional view of the positioning cylinder in this invention.

[0028] Figure 8 This is a schematic diagram showing the engagement of the positioning cylinder and one end of the combined cylinder in this invention.

[0029] Figure 9 This is a schematic diagram of the surface detection component in this invention.

[0030] Figure 10 for Figure 9 Enlarged structural diagram at point B.

[0031] Figure 11 This is a schematic diagram of the central positioning component structure of the present invention.

[0032] Figure 12 for Figure 11 Enlarged structural diagram at point C.

[0033] In the diagram: 1. Grid support; 2. Detection rod assembly; 20. Combination cylinder one; 200. Positioning hole two; 21. Combination cylinder two; 22. Plug; 220. Connecting thread; 221. Mounting plug; 23. Fiber grating; 24. Connecting spring; 25. Positioning ring; 26. Injection hole; 27. Positioning screw; 28. Leakage hole; 29. ​​Spring rod; 210. Positioning cylinder; 211. Injection groove; 212. Positioning hole one; 213. Disassembly groove; 3. Surface detection assembly; 30. Central ring; 300. Slide groove; 31. Sliding rod; 310. Matching slider; 32. Insertion cylinder; 33. Sealing nut; 330. Docking hole; 4. Central positioning assembly; 40. Fixing bracket; 41. Sensor connector; 43. Central positioning plate. Detailed Implementation

[0034] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0035] like Figures 1-6As shown, a slope displacement monitoring device includes boreholes distributed on the slope surface. The boreholes are located at the center of the grid of the grid support 1. A detection rod assembly 2 is installed in the borehole. The detection rod assembly 2 is connected to a displacement sensor. A surface detection assembly 3 is installed on the grid support 1. The center of the surface detection assembly 3 is connected to the detection rod assembly 2. The detection rod assembly 2 includes a first combination cylinder 20 and multiple second combination cylinders 21. The first combination cylinder 20 and the second combination cylinders 21 are made of elastic material. The first combination cylinder 20 and the second combination cylinders 21 are connected end to end. A fiber optic grating 23 is coaxially arranged inside the first combination cylinder 20 and extends into the second combination cylinders 21. Leakage holes 28 are provided on the side walls of the first combination cylinder 20 and the second combination cylinders 21. The detection rod assembly 2 composed of the first combination cylinder 20 and the second combination cylinders 21 is filled with elastic material. The fiber optic grating 23 is located at the center of the first combination cylinder 20 and the second combination cylinders 21. The fiber optic grating 23 is encapsulated by the filled elastic material.

[0036] Specifically, after the grid support 1 is poured, holes are drilled in the center of the grid. It is important to ensure that the holes are as perpendicular as possible to the slope surface, making it easier for the detection rod assembly 2 to monitor the stratified displacement within the slope during continuous monitoring. After drilling, the frame structure of the detection rod assembly 2 is formed by connecting the first combined cylinder 20 and multiple second combined cylinders 21 end-to-end. Then, the fiber optic grating 23 used for displacement detection is inserted into the detection rod assembly 2 through its end. It is important to note that the surface of the fiber optic grating 23 is not fixed to the interior of the detection rod assembly 2. This avoids deformation and stretching of the detection rod assembly 2 due to displacement within the slope, which could cause the fiber optic grating 23 to break.

[0037] More specifically, to further protect the fiber optic grating 23 inside the detection rod assembly 2, after the detection rod assembly 2 is inserted into the borehole and installed, an elastic material is injected into the detection rod assembly 2. After the elastic material solidifies, it forms a sealed protection for the fiber optic grating 23. When displacement occurs inside the slope, it causes the detection rod assembly 2 to bend as a whole, and in conjunction with the fiber optic grating 23, the displacement can be detected in real time. The elastic material can be rubber, silicone, or polyurethane.

[0038] Furthermore, such as Figure 7 , Figure 8 As shown, a positioning cylinder 210 is installed inside the drill hole. A material injection groove 211 is evenly arranged on the side wall of the positioning cylinder 210. The material injection groove 211 is parallel to the axis of the positioning cylinder 210 and extends to the bottom end of the positioning cylinder 210. The leakage holes 28 on the side walls of the combined cylinder 1 20 and the combined cylinder 21 are set corresponding to the material injection groove 211.

[0039] Specifically, to facilitate the insertion of the detection rod assembly 2 into the drilled hole, a positioning cylinder 210 is inserted into the drilled hole after drilling is completed. At the same time, to ensure that the detection rod assembly 2 maintains its initial installation posture with the drilled hole after the positioning cylinder 210 is subsequently removed, multiple injection grooves 211 are opened on the side wall of the positioning cylinder 210. The leakage holes 28 opened on the side walls of the first combination cylinder 20 and the second combination cylinder 21 are directly opposite the injection grooves 211, so that the detection rod assembly 2 is also filled with elastic material in the injection grooves 211 to form support. After the positioning cylinder 210 is removed, elastic material continues to be injected into the drilled hole, so that the cavity left at the location where the positioning cylinder 210 is removed continues to be filled with elastic material, thus protecting the entire detection rod assembly 2.

[0040] Furthermore, such as Figure 7 , Figure 8 As shown, the upper end of the positioning cylinder 210 is provided with a positioning hole 212, and the upper end of the combined cylinder 20 is provided with a positioning hole 200. The positioning hole 212, the positioning hole 200, and the injection groove 211 correspond to each other.

[0041] Furthermore, such as Figure 8 As shown, the positioning cylinder 210 has a disassembly groove 213 on its edge, and the positioning hole 212 is provided through it. The positioning cylinder 210 is fixedly installed to the edge of the drill hole through the positioning hole 212.

[0042] Specifically, to facilitate the positioning between the positioning cylinder 210 and the detection rod assembly 2, and to ensure that the elastic material can smoothly enter the injection groove 211 from the leak hole 28 during subsequent injection, a positioning hole 212 is provided at the upper end of the positioning cylinder 210, and a positioning hole 200 is provided at the upper end of the combined cylinder 20. After the positioning cylinder 210 is inserted into the drill hole, it first forms a positioning with the edge of the drill hole through the positioning hole 212. It can also be positioned by inserting a pin and the positioning hole 212 into the slope. Then, the detection rod assembly 2 is installed in conjunction with the positioning hole 212. The combined cylinder 20 at the upper end adjusts the insertion angle through the positioning hole 200 and the positioning hole 212 on the positioning cylinder 210 to ensure that the leak hole 28 on the detection rod assembly 2 corresponds to the injection groove 211 on the positioning cylinder 210, so that the elastic material can be smoothly injected into the injection groove 211 during subsequent injection.

[0043] Furthermore, such as Figure 3 , Figure 4 As shown, mounting holes are provided on the side walls of the first combination cylinder 20 and the second combination cylinder 21. A positioning ring 25 is sleeved on the outer side of the fiber optic grating 23. A positioning screw 27 is provided at the mounting hole. The positioning ring 25 is connected to the first combination cylinder 20 and the second combination cylinder 21 through the positioning screw 27.

[0044] Furthermore, such as Figure 4As shown, the connection between the inner ring of the positioning ring 25 and the fiber optic grating 23 is provided with a rounded chamfer, and the positioning ring 25 is provided with an injection hole 26.

[0045] Specifically, to ensure that the fiber optic grating 23 is centered in the middle of the detection rod assembly 2, positioning rings 25 are provided inside the first combination cylinder 20 and the second combination cylinder 21. Positioning rings 25 are positioned using positioning screws 27 on the side walls. When installing the fiber optic grating 23, it can be directly inserted into the detection rod assembly 2, and the fiber optic grating 23 smoothly inserts itself with the rounded chamfer of the inner ring of the positioning ring 25. Simultaneously, to facilitate subsequent injection of elastic material, injection holes 26 are provided on the positioning rings 25. Elastic material can be inserted through the injection holes 26 to sequentially inject it into the second combination cylinder 21 and the first combination cylinder 20.

[0046] Furthermore, such as Figure 3 , Figure 5 , Figure 6 As shown, the end of the first combination cylinder 20 is provided with an internal thread, and the two ends of the second combination cylinder 21 are respectively provided with an internal thread and an external thread. The first combination cylinder 20 and the second combination cylinder 21, as well as multiple second combination cylinders 21, are connected by internal and external threads. A connecting spring 24 is also provided between the first combination cylinder 20 and the second combination cylinder 21, as well as multiple second combination cylinders 21. Multiple spring rods 29 are embedded in the internal thread portion of the first combination cylinder 20 and the second combination cylinder 21.

[0047] Specifically, the depth of the detection rod assembly 2 can be set according to the geological conditions. Since the combined cylinder 1 20 and combined cylinder 2 21 are also made of elastic material, a spring rod 29 is embedded in the internal thread to facilitate threaded connection and ensure stability when the thread is screwed. At the same time, the spring rod 29 can also deform synchronously when affected by the internal displacement of the slope, thereby transmitting the displacement to the internal fiber optic grating 23 and being detected by the displacement sensor.

[0048] Furthermore, such as Figure 3 As shown, the end of the combined cylinder 20 is provided with a plug 22, and the two sides of the plug 22 are respectively provided with a mounting plug 221 and a connecting thread 220. The mounting plug 221 is connected to the end of the combined cylinder 20, and the plug 22 is connected to the surface detection component 3 through the connecting thread 220.

[0049] Specifically, after the detection rod assembly 2 is installed and the elastic material is initially poured in, the positioning cylinder 210 is removed from the borehole, and the elastic material is poured into the borehole to fill the borehole and the detection rod assembly 2 with elastic material. After the elastic material has set, the plug 22 is installed at the end of the combined cylinder 20, and the fiber optic grating 23 passes through the plug 22 and connects to the subsequent surface detection assembly 3.

[0050] Furthermore, such as Figure 2 , Figure 9 , Figure 10 As shown, the surface detection component 3 includes a central ring 30, the inner ring of which is provided with a sealing nut 33, which cooperates with the connecting thread 220. The sealing nut 33 is provided with a mating hole 330. The side of the central ring 30 is provided with a sliding groove 300, and multiple mating sliders 310 are distributed in the sliding groove 300. The mating sliders 310 are connected to sliding rods 31. The vertex of the grid support 1 is rotatably installed with a plug-in cylinder 32. The sliding rods 31 and the plug-in cylinder 32 are plugged into each other. The fiber optic grating 23 passes through the sealing nut 33 and is connected to a central positioning component 4.

[0051] Specifically, the central ring 30 is sleeved on the sealing nut 33, and the sealing nut 33 is connected to the connecting thread 220 of the plug 22. The central ring 30 is connected to the top of the grid support 1 by the surrounding sliding rods 31 and plug-in cylinders 32. When the slope surface is displaced, the insertion length and interval angle between the multiple sliding rods 31 and plug-in cylinders 32 distributed in the surface detection component 3 will change. The displacement of the slope surface can also be determined by observing the insertion length and interval angle between the sliding rods 31 and plug-in cylinders 32.

[0052] Furthermore, such as Figure 2 , Figure 11 , Figure 12 As shown, the central positioning component 4 includes a fixing frame 40 disposed on the surface of the grid support 1. A central positioning disk 43 is disposed at the center of the fixing frame 40. The fiber optic grating 23 passes through the central positioning disk 43 and is connected to a sensor connector 41. The sensor connector 41 is connected to a displacement sensor.

[0053] Specifically, the displacement changes on the slope surface can also be detected by the fiber optic grating 23. By setting a central positioning component 4 between the grid supports 1, after the detection rod component 2 and the surface detection component 3 are installed, the fiber optic grating 23 extends to the center of the central positioning disk 43. When displacement occurs on the slope surface, the fiber optic grating 23 between the central positioning disk 43 and the end of the detection rod component 2 will deform accordingly, thereby measuring the displacement of the slope surface. Combined with the fiber optic grating 23, real-time monitoring and recording of the displacement of the entire slope can be achieved. Based on the detection rod components 2 distributed between the grid supports 1, the displacement of the entire slope can be detected, and a displacement model can be constructed, thus visually displaying the displacement changes inside the slope.

[0054] The working principle of this invention embodiment is as follows:

[0055] like Figures 1-12As shown, after the grid support 1 is poured, holes are drilled in the center of the grid. It is important to ensure that the holes are as perpendicular as possible to the slope surface, making it easier for the detection rod assembly 2 to monitor the stratified displacement within the slope during continuous monitoring. After drilling, the frame structure of the detection rod assembly 2 is formed by connecting the first combined cylinder 20 and multiple second combined cylinders 21 end-to-end. Then, the fiber optic grating 23 used for displacement detection is inserted into the detection rod assembly 2 through its end. It is important to note that the surface of the fiber optic grating 23 is not fixed to the interior of the detection rod assembly 2. This prevents deformation and stretching of the detection rod assembly 2 when displacement occurs within the slope, which could cause the fiber optic grating 23 to break. To further protect the fiber optic grating 23 inside the detection rod assembly 2, after the detection rod assembly 2 is inserted into the drilled holes and installed, an elastic material is injected into the detection rod assembly 2. After the elastic material solidifies, it forms a sealed protection for the fiber optic grating 23. When displacement occurs within the slope, it causes the detection rod assembly 2 to bend as a whole, allowing for real-time detection of the displacement in conjunction with the fiber optic grating 23. To facilitate the insertion of the detection rod assembly 2 into the drilled hole, a positioning cylinder 210 is inserted into the drilled hole after drilling is completed. At the same time, to ensure that the detection rod assembly 2 maintains its initial installation posture with the drilled hole after the positioning cylinder 210 is subsequently removed, multiple injection grooves 211 are opened on the side wall of the positioning cylinder 210. The leakage holes 28 opened on the side walls of the first combination cylinder 20 and the second combination cylinder 21 are directly opposite the injection grooves 211, so that the detection rod assembly 2 is also filled with elastic material at the injection grooves 211 to form support. After the positioning cylinder 210 is removed, elastic material continues to be injected into the drilled hole, so that the cavity left at the location where the positioning cylinder 210 is removed continues to be filled with elastic material, thus protecting the entire detection rod assembly 2. To facilitate the positioning between the positioning cylinder 210 and the detection rod assembly 2, and to ensure that the elastic material can smoothly enter the injection tank 211 from the hole 28 during subsequent injection, a positioning hole 212 is provided at the upper end of the positioning cylinder 210, and a positioning hole 200 is provided at the upper end of the combined cylinder 20. After the positioning cylinder 210 is inserted into the drill hole, it first forms a positioning with the edge of the drill hole through the positioning hole 212. Then, the detection rod assembly 2 is installed in conjunction with the positioning hole 212. The combined cylinder 20 at the upper end adjusts the insertion angle through the positioning hole 200 and the positioning hole 212 on the positioning cylinder 210 to ensure that the hole 28 on the detection rod assembly 2 corresponds to the injection tank 211 on the positioning cylinder 210, so that the elastic material can be smoothly injected into the injection tank 211 during subsequent injection. The depth of the detection rod assembly 2 can be set according to the geological conditions. Since the combined cylinder 1 20 and combined cylinder 2 21 are also made of elastic material, a spring rod 29 is embedded in the internal thread to facilitate threaded connection and ensure stability when the thread is screwed. At the same time, the spring rod 29 can also deform synchronously when affected by the internal displacement of the slope, thereby transmitting the displacement to the internal fiber optic grating 23 and being detected by the displacement sensor.The displacement changes on the slope surface can also be detected by the fiber optic grating 23. By setting a central positioning component 4 between the grid supports 1, after the detection rod component 2 and the surface detection component 3 are installed, the fiber optic grating 23 extends to the center of the central positioning disk 43. When displacement occurs on the slope surface, the fiber optic grating 23 between the central positioning disk 43 and the end of the detection rod component 2 deforms accordingly, thereby measuring the displacement of the slope surface. Combined with the fiber optic grating 23, real-time monitoring and recording of the displacement of the entire slope are achieved. Based on the detection rod components 2 distributed between the grid supports 1, the displacement of the entire slope can be detected, and a displacement model can be constructed, thus visually displaying the displacement changes inside the slope.

[0056] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0057] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A slope displacement monitoring device, comprising boreholes distributed on the slope surface, the boreholes being distributed at the center of a grid of a grid support (1), characterized in that, A detection rod assembly (2) is provided inside the borehole, and a displacement sensor is connected to the detection rod assembly (2). A surface detection assembly (3) is provided on the grid support (1), and the center of the surface detection assembly (3) is connected to the detection rod assembly (2). The detection rod assembly (2) includes a first combination cylinder (20) and multiple second combination cylinders (21). The first combination cylinder (20) and the second combination cylinders (21) are made of elastic material. The first combination cylinder (20) and the second combination cylinders (21) are connected end to end, as are adjacent second combination cylinders (21). A fiber optic grating (23) is coaxially arranged inside the first combination cylinder (20) and extends into the second combination cylinder (21). A leakage hole (28) is provided on the side wall of the first combination cylinder (20) and the second combination cylinders (21). The detection rod assembly (2) composed of the first combination cylinder (20) and the second combination cylinders (21) is filled with elastic material. The fiber optic grating (23) is located at the center of the first combination cylinder (20) and the second combination cylinders (21). The fiber optic grating (23) is encapsulated by the filled elastic material. A positioning cylinder (210) is installed inside the borehole. A material injection groove (211) is evenly arranged on the side wall of the positioning cylinder (210). The material injection groove (211) is parallel to the axis of the positioning cylinder (210) and extends to the bottom end of the positioning cylinder (210). The leakage holes (28) on the side walls of the first combination cylinder (20) and the second combination cylinder (21) are provided corresponding to the material injection groove (211). The upper end of the positioning cylinder (210) is provided with a positioning hole one (212), and the upper end of the combined cylinder one (20) is provided with a positioning hole two (200). The positioning hole one (212), the positioning hole two (200), and the injection groove (211) correspond to each other.

2. The slope displacement monitoring device according to claim 1, characterized in that, The positioning cylinder (210) has a disassembly groove (213) on its edge, and the positioning hole (212) is provided through it. The positioning cylinder (210) is fixedly installed to the edge of the drill hole through the positioning hole (212).

3. The slope displacement monitoring device according to claim 1, characterized in that, Mounting holes are provided on the side walls of the first (20) and the second (21) of the combined cylinder. A positioning ring (25) is sleeved on the outer side of the fiber optic grating (23). A positioning screw (27) is provided at the mounting hole. The positioning ring (25) is connected to the first (20) and the second (21) of the combined cylinder through the positioning screw (27).

4. A slope displacement monitoring device according to claim 3, characterized in that, The inner ring of the positioning ring (25) is provided with a rounded chamfer at the connection between it and the fiber optic grating (23), and the positioning ring (25) is provided with a filling hole (26).

5. A slope displacement monitoring device according to claim 1, characterized in that, The end of the first combination cylinder (20) is provided with an internal thread, and the two ends of the second combination cylinder (21) are respectively provided with an internal thread and an external thread. The first combination cylinder (20) and the second combination cylinder (21) and multiple second combination cylinders (21) are connected by internal and external threads. A connecting spring (24) is also provided between the first combination cylinder (20) and the second combination cylinder (21) and multiple second combination cylinders (21). Multiple spring rods (29) are embedded in the internal thread of the first combination cylinder (20) and the second combination cylinder (21).

6. The slope displacement monitoring device according to claim 1, characterized in that, The end of the first combination cylinder (20) is provided with a plug (22), and the two sides of the plug (22) are respectively provided with a mounting plug (221) and a connecting thread (220). The mounting plug (221) is connected to the end of the first combination cylinder (20), and the plug (22) is connected to the surface detection component (3) through the connecting thread (220).

7. A slope displacement monitoring device according to claim 6, characterized in that, The surface detection component (3) includes a central ring (30), the inner ring of which is provided with a sealing nut (33), the sealing nut (33) and the connecting thread (220) are mutually engaged, the sealing nut (33) is provided with a mating hole (330), the side of the central ring (30) is provided with a sliding groove (300), a plurality of mating sliders (310) are distributed in the sliding groove (300), the mating sliders (310) are connected to a sliding rod (31), the vertex of the grid support (1) is rotatably installed with a plug-in cylinder (32), the sliding rod (31) and the plug-in cylinder (32) are mutually plugged in, and the fiber grating (23) passes through the sealing nut (33) and is connected to a central positioning component (4).

8. A slope displacement monitoring device according to claim 7, characterized in that, The central positioning component (4) includes a fixing frame (40) set on the surface of the grid support (1). A central positioning disk (43) is set at the center of the fixing frame (40). The fiber optic grating (23) passes through the central positioning disk (43) and is connected to a sensor connector (41). The sensor connector (41) is connected to a displacement sensor.

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