Online real-time monitoring device for strong adaptability three-dimensional soil depth deformation field

Abstract

The utility model provides a kind of strong adaptability three-dimensional soil depth deformation field on-line real-time monitoring device, including sensing optical fiber, auxiliary pipe, optical fiber fixer, optical fiber demodulator, wireless transmission module and power module;Optical fiber demodulator and wireless transmission module are connected with power module respectively;Sensing optical fiber is worn in the auxiliary pipe, sensing optical fiber in each auxiliary pipe is connected after series connection with optical fiber demodulator, and optical fiber demodulator is connected with monitoring platform by wireless transmission module;Auxiliary pipe includes multiple sections of joint pipe and a section of bottom pipe, two through holes for wearing sensing optical fiber are equipped in each joint pipe, two through holes are distributed along axial direction parallel and symmetrically, U-shaped hole for wearing sensing optical fiber is equipped in bottom pipe, and the sensing optical fiber is fixed by optical fiber fixer after being stretched out from the through hole of auxiliary pipe.The utility model can be adapted to extreme environment use, and when core breakage occurs, it can be quickly repaired without re-drilling.

Description

Technical Field

[0001] This utility model relates to the field of soil deformation monitoring technology, and in particular to a highly adaptable three-dimensional soil depth deformation field online real-time monitoring device. Background Technology

[0002] Soil depth deformation monitoring refers to the process of quantitatively recording the changes in soil displacement, strain, and other parameters at different underground depths over time using certain sensing technologies. It is an important technical means for geological disaster early warning, infrastructure safety assessment, and slope engineering stability analysis, and has been widely used in the engineering and academic research fields for a long time.

[0003] Traditional soil depth deformation monitoring mainly relies on inclinometers, which suffer from limitations such as difficult deployment, frequent maintenance, and poor data continuity, resulting in low monitoring efficiency and accuracy. In recent years, fiber-optic soil depth deformation monitoring technology has developed rapidly by leveraging the advantages of fully distributed measurement, high precision and sensitivity, strong anti-interference capabilities, and extremely long measurement distances. It is poised to replace inclinometer monitoring technology, and its research significance and prospects are very significant.

[0004] Currently, methods for monitoring soil deformation based on optical fibers include: 1. Chinese invention patent (application number CN201611039644.7) discloses a method for slope stability monitoring and landslide early warning based on an all-fiber optic sensor network; 2. Chinese invention patent (application number CN201610382460.4) discloses a method and device for calibration and testing of distributed optical fiber monitoring of soil deformation; 3. Chinese invention patent (application number CN201911019803.0) discloses a quasi-distributed monitoring device for surface settlement based on optical fiber sensing technology. The overall composition of these devices and methods is basically the same, mainly including sensing optical fibers, optical fiber demodulators, and data processing and analysis systems. They can detect soil deformation, but the main problems are as follows: 1. The optical fiber is in direct contact with the external soil, and is prone to core breakage in extreme disaster scenarios where monitoring is more significant. After damage, re-drilling is required, and rapid repair is not possible; 2. The optical fiber is affected by both temperature and deformation, and the monitoring results of existing devices are easily affected by temperature; 3. Existing monitoring devices usually require an external power supply, which is not suitable for long-term automated monitoring in field scenarios. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a highly adaptable online real-time monitoring device for three-dimensional soil depth deformation field, which can be used in extreme environments and can achieve rapid repair without re-drilling when core breakage occurs.

[0006] This utility model is implemented as follows: a highly adaptable three-dimensional soil depth deformation field online real-time monitoring device, including a sensing optical fiber, an auxiliary circular tube, an optical fiber fixer, an optical fiber demodulator, a wireless transmission module, and a power supply module; the optical fiber demodulator and the wireless transmission module are respectively connected to the power supply module;

[0007] The auxiliary circular tube is inserted into the soil, and the sensing optical fiber is passed through the auxiliary circular tube. The sensing optical fibers in each auxiliary circular tube are connected in series and then connected to the optical fiber demodulator. The optical fiber demodulator is connected to the monitoring platform through a wireless transmission module.

[0008] The auxiliary circular tube includes a plurality of connecting circular tubes and a bottom circular tube. Each connecting circular tube has two through holes for threading a sensing optical fiber. The two through holes are parallel and symmetrically distributed along the axial direction. The bottom circular tube has a U-shaped hole for threading a sensing optical fiber. The two through holes are connected through the U-shaped hole. The sensing optical fiber extends out of the through hole of the auxiliary circular tube and is fixed by the optical fiber fixer.

[0009] Furthermore, the bottom surface of the bottom tube is an arc-shaped convex head, and the top surface is provided with two concave cylinders and two convex cylinders. The bottom surface of each connecting tube is provided with two convex cylinders and two concave cylinders that match the top surface of the bottom tube. The top surface of each connecting tube has the same structure as the top surface of the bottom tube. Each section of tube is connected by convex cylinders and concave cylinders to form an auxiliary tube.

[0010] Furthermore, on the top surface of the connecting tube, the two concave cylinders are collinear with the two through holes, and the line connecting the two convex cylinders is perpendicular to the line connecting the two concave cylinders. The distribution positions of the concave and convex cylinders on the bottom surface of the connecting tube are opposite to those on the top surface.

[0011] Furthermore, the sensing optical fiber passes sequentially through a through hole, a U-shaped hole, and another through hole inside the auxiliary circular tube, and after being wound around the convex cylinder at the top of the uppermost continuous circular tube, it is inserted into the optical fiber retainer.

[0012] Furthermore, the fiber optic fixer includes a detachable upper housing and a lower housing. The upper housing and the lower housing are each provided with two semi-circular grooves. When the upper housing and the lower housing are fastened together, the four semi-circular grooves form two circular holes, which secure the sensing fiber to the fiber optic fixer.

[0013] Furthermore, the monitoring device also includes an edge computing system, which is connected to the power supply module. The fiber optic demodulator is connected to the edge computing system, transmits data to the edge computing system for analysis and processing, and then sends it to the monitoring platform via a wireless transmission module.

[0014] Furthermore, the power supply module includes a photovoltaic panel and a battery.

[0015] This utility model has the following advantages:

[0016] 1. By setting up an auxiliary circular tube, the sensing optical fiber is inserted into the through hole and U-shaped hole of the auxiliary circular tube, which protects the sensing optical fiber to adapt to extreme disaster scenarios. At the same time, it can reduce the influence of temperature and reduce the interference of temperature on deformation monitoring, thereby improving the accuracy of monitoring.

[0017] 2. The optical fibers of each auxiliary tube are individually fixed and threaded through the optical fiber fixer. In the event of a core breakage, there is no need to re-drill holes. Simply cut and pull out the sensing optical fiber in the individual auxiliary tube, thread the new optical fiber through it, and fusion splice it with the surrounding optical fibers. This allows for rapid replacement of optical fibers. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the auxiliary circular tube and optical fiber connection structure of the online real-time monitoring device for the highly adaptable three-dimensional soil depth deformation field of this utility model.

[0020] Figure 2 This is a schematic diagram of the distribution of monitoring points in a specific embodiment of the present invention.

[0021] Figure 3 This is a schematic diagram of the continuation circular tube structure of this utility model.

[0022] Figure 4 This is a schematic diagram of the bottom circular tube structure of this utility model.

[0023] Figure 5 This is a schematic diagram of the cross-section of the continuation circular pipe of this utility model.

[0024] Figure 6 This is a schematic diagram of the structure of the connecting circular tube and the top surface of the bottom circular tube of this utility model.

[0025] Figure 7 This is a schematic diagram of the bottom structure of the continuation circular tube of this utility model.

[0026] Figure 8 This is a schematic diagram showing the fiber optic fixer and auxiliary round tube in use according to this utility model.

[0027] Figure 9 This is a schematic diagram of the fiber optic fixer of this utility model.

[0028] Figure 10 This is a schematic diagram illustrating the principle of the highly adaptable three-dimensional soil depth deformation field online real-time monitoring device of this utility model.

[0029] In the diagram: 1. Sensing fiber optic cable; 2. Auxiliary round tube; 21. Splicing round tube; 22. Bottom round tube; 23. Through hole; 24. U-shaped hole; 25. Concave cylinder; 26. Convex cylinder; 3. Fiber optic cable holder; 31. Upper box; 32. Lower box; 33. Round hole; 4. Fiber optic demodulator; 5. Wireless transmission module; 6. Power supply module; 61. Photovoltaic panel; 62. Battery; 7. Edge computing system. Detailed Implementation

[0030] Please see Figures 1 to 9 As shown, this utility model provides a highly adaptable three-dimensional soil depth deformation field online real-time monitoring device, including a sensing optical fiber 1, an auxiliary circular tube 2, an optical fiber fixer 3, an optical fiber demodulator 4, a wireless transmission module 5, and a power supply module 6; the optical fiber demodulator 4 and the wireless transmission module 5 are respectively connected to the power supply module 6.

[0031] The auxiliary circular tube 2 is inserted into the soil and distributed in multiple rows and columns to form a three-dimensional monitoring point distribution. The sensing optical fiber 1 is inserted into the auxiliary circular tube 2. The sensing optical fibers in each auxiliary circular tube 2 are connected in series and then connected to the optical fiber demodulator 4. The optical fiber demodulator 4 is connected to the monitoring platform (not shown) through the wireless transmission module 5.

[0032] The auxiliary circular tube 2 includes a plurality of connecting circular tubes 21 and a bottom circular tube 22. Each connecting circular tube 21 has two through holes 23 for inserting sensing optical fibers. Both through holes extend straight through the connecting circular tube and are parallel and symmetrically distributed along the axial direction. The bottom circular tube 22 has a U-shaped hole 24 for inserting sensing optical fibers 1. The two through holes 23 are connected through the U-shaped hole 24. The sensing optical fiber 1 extends out of the through hole of the auxiliary circular tube 2 and is fixed by the optical fiber fixer 3.

[0033] In one specific embodiment, the fiber demodulator 4 includes BOTDA (Brillouin Optical Time Domain Analysis) and DAS (Distributed Fiber Acoustic Sensing) modules; these are used to demodulate fiber strain signals and determine the location of fiber breakage (since DAS technology does not require a closed loop, it can be used to determine the location of fiber breakage), so that the breakage location can be quickly located after a fiber breakage occurs. Then, the fiber at the fiber fixing device is cut, the broken fiber is pulled out, and the fiber is re-threaded and fixed before being connected to the monitoring device by fusion splicing.

[0034] In one specific embodiment, the bottom surface of the bottom circular tube 22 is an arc-shaped convex head, and the top surface is provided with two concave cylinders 25 and two convex cylinders 26. The bottom surface of each connecting circular tube 21 is provided with two convex cylinders 26 and two concave cylinders 25 that match the top surface of the bottom circular tube. The top surface of each connecting circular tube 21 has the same structure as the top surface of the bottom circular tube 22. Each section of circular tube (connecting circular tubes and connecting circular tubes, connecting circular tubes and bottom circular tubes) is connected by convex cylinders and concave cylinders to form auxiliary circular tubes 2. The connecting circular tubes and the bottom circular tubes are connected by convex cylinders and concave cylinders, and the connecting circular tubes and connecting circular tubes are connected by convex cylinders and concave cylinders to form a fixed whole, which facilitates rapid construction and ensures that all holes in the auxiliary tubes are connected.

[0035] In one specific embodiment, on the top surface of the connecting tube 21, two concave cylinders 25 are collinear with two through holes 26, and the line connecting the two convex cylinders 26 is perpendicular to the line connecting the two concave cylinders 25. The distribution positions of the concave cylinders 25 and convex cylinders 26 on the bottom surface of the connecting tube are opposite to those on the top surface.

[0036] In one specific embodiment, the sensing optical fiber 1 passes through a through hole 23, a U-shaped hole 24 and another through hole 23 in the auxiliary circular tube 2 in sequence, tightens both ends of the sensing optical fiber, and after being wrapped around the convex cylinder 26 at the top of the uppermost continuous circular tube 21 multiple times, it is inserted into the optical fiber fixer 3.

[0037] In one specific embodiment, the fiber optic fixer 3 includes a detachable upper housing 31 and a lower housing 32. The upper housing 31 and the lower housing 32 are respectively provided with two semi-circular grooves. When the upper housing 31 and the lower housing 32 are fastened together, the four semi-circular grooves form two circular holes 33. The circular holes 33 secure the sensing fiber to the fiber optic fixer 3.

[0038] In one specific embodiment, the monitoring device further includes an edge computing system 7, which is connected to the power supply module 6. The fiber optic demodulator 4 is also connected to the edge computing system 7, transmitting data to the edge computing system 7 for analysis and processing before sending it to the monitoring platform via the wireless transmission module 5. By setting up the edge computing system, optical signal analysis can be performed at the edge to obtain the strain of the optical fiber, which is equivalent to the strain of the auxiliary circular tube. The lateral displacement of the auxiliary circular tube can be obtained through integration, and finally, the deformation of the soil can be inverted through the stiffness relationship between the auxiliary circular tube and the soil. This ensures that the data transmitted by the wireless transmission module to the monitoring platform is only displacement data of a limited number of points, rather than the original optical signal data, further reducing the data transmission volume of the wireless transmission module.

[0039] In one specific embodiment, the power supply module 6 includes a photovoltaic panel 61 and a battery 62. The photovoltaic panel 61 converts light energy into electrical energy, stores it in the battery, and supplies power to the fiber optic demodulator 4, the edge computing system 7, and the wireless transmission module 5. This allows for use in outdoor environments where no external power source is available.

[0040] Preferably, the power supply module 6 further includes a working state adjustment response module, used to adjust the monitoring frequency and transmission frequency according to preset conditions, including light intensity, remaining battery power, and result change rate. The working state adjustment response module can adjust the monitoring frequency and transmission frequency based on factors such as light intensity, remaining battery power, and result change rate, and can also remotely adjust the monitoring frequency and transmission frequency through a monitoring platform.

[0041] This invention protects the sensing fiber by inserting it into the longitudinal hollow grooves (i.e., through holes and U-shaped holes) of an auxiliary circular tube, thus mitigating the effects of temperature. This makes it suitable for extreme disaster scenarios and improves monitoring accuracy. It utilizes BOTDA monitoring technology and the conversion between fiber deformation, auxiliary tube deformation, and soil deformation to analyze and monitor deep soil deformation. Even after a short core failure, the DAS technology within the fiber demodulator can quickly locate the broken core, and a new fiber can be quickly replaced using the auxiliary circular tube and fiber fixator (without needing to re-drill holes or replace the auxiliary circular tube). Furthermore, it reduces data transmission by incorporating edge computing technology and includes a photovoltaic panel, battery, and a corresponding operating status adjustment and response module to fully adapt to outdoor work scenarios without power.

[0042] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A highly adaptable three-dimensional soil depth deformation field online real-time monitoring device, characterized in that: Includes sensing optical fiber, auxiliary circular tube, optical fiber fixer, optical fiber demodulator, wireless transmission module and power supply module; The fiber optic demodulator and the wireless transmission module are respectively connected to the power supply module; The auxiliary circular tube is inserted into the soil, and the sensing optical fiber is passed through the auxiliary circular tube. The sensing optical fibers in each auxiliary circular tube are connected in series and then connected to the optical fiber demodulator. The optical fiber demodulator is connected to the monitoring platform through a wireless transmission module. The auxiliary circular tube includes a plurality of connecting circular tubes and a bottom circular tube. Each connecting circular tube has two through holes for threading a sensing optical fiber. The two through holes are parallel and symmetrically distributed along the axial direction. The bottom circular tube has a U-shaped hole for threading a sensing optical fiber. The two through holes are connected through the U-shaped hole. The sensing optical fiber extends out of the through hole of the auxiliary circular tube and is fixed by the optical fiber fixer.

2. The highly adaptable three-dimensional soil depth deformation field online real-time monitoring device according to claim 1, characterized in that: The bottom surface of the bottom tube is an arc-shaped convex head, and the top surface is provided with two concave cylinders and two convex cylinders. The bottom surface of each connecting tube is provided with two convex cylinders and two concave cylinders that match the top surface of the bottom tube. The top surface of each connecting tube has the same structure as the top surface of the bottom tube. Each section of tube is connected by convex cylinders and concave cylinders to form an auxiliary tube.

3. The highly adaptable three-dimensional soil depth deformation field online real-time monitoring device according to claim 2, characterized in that: On the top surface of the connecting tube, two concave cylinders are collinear with two through holes, and the line connecting the two convex cylinders is perpendicular to the line connecting the two concave cylinders. The distribution positions of the concave and convex cylinders on the bottom surface of the connecting tube are opposite to those on the top surface.

4. The highly adaptable three-dimensional soil depth deformation field online real-time monitoring device according to claim 2, characterized in that: The sensing optical fiber passes sequentially through a through hole, a U-shaped hole, and another through hole inside the auxiliary circular tube, and after being wound around the convex cylinder at the top of the uppermost continuous circular tube, it is inserted into the optical fiber retainer.

5. The highly adaptable three-dimensional soil depth deformation field online real-time monitoring device according to claim 1, characterized in that: The fiber optic fixer includes a detachable upper housing and a lower housing. The upper housing and the lower housing are each provided with two semi-circular grooves. When the upper housing and the lower housing are fastened together, the four semi-circular grooves form two circular holes, which secure the sensing fiber to the fiber optic fixer.

6. The highly adaptable three-dimensional soil depth deformation field online real-time monitoring device according to claim 1, characterized in that: The monitoring device also includes an edge computing system, which is connected to the power supply module. The fiber optic demodulator is connected to the edge computing system and transmits data to the edge computing system for analysis and processing before sending it to the monitoring platform via a wireless transmission module.

7. The highly adaptable three-dimensional soil depth deformation field online real-time monitoring device according to claim 1, characterized in that: The power supply module includes a photovoltaic panel and a battery.

Images