A fiber grating soil monitoring device

Abstract

The present application relates to a fiber Bragg grating soil monitoring device, and relates to the field of soil monitoring technology, which includes a demodulator, several strain fiber Bragg grating detection chains and several mounting parts, wherein the several fiber Bragg grating detection chains respectively include a multi-core optical cable pre-buried under the slope surface of the slope to be monitored, the multi-core optical cable is respectively connected in series with several strain fiber Bragg grating sensors, and the several strain fiber Bragg grating sensors are respectively detachably mounted on several mounting parts, and the several mounting parts are inserted under the slope surface of the slope to be monitored, and the several mounting parts are arranged in a linear array; the output ends of the multi-core optical cable are all connected to the demodulator, and the signal output end of the demodulator is connected to a signal processor, and the signal processor receives several force sensing signals and generates a slope monitoring array; the signal output end of the signal processor is connected to a display in a control room; the signal output end of the demodulator is also connected to a fire alarm host. The present application can monitor the slope in real time and reduce the losses caused by landslide disasters.

Description

Technical Field

[0001] The present application relates to the field of soil monitoring technology, and in particular to a fiber grating soil monitoring device. Background Art

[0002] Landslide disaster is a natural disaster, which mainly refers to the disaster caused by the rock or soil losing its original balance under the action of gravity and sliding down the slope along the potential weak structural surface in whole or in part. Studies have shown that rainfall is one of the main causes of landslide disasters. The effect of rainfall on landslide is a dynamic process. Rainwater infiltrates into the soil, which increases the water content of the soil, increases the bulk density of the soil, causes the soil to soften, and then leads to a decrease in the shear strength of the soil. Therefore, distributed real-time monitoring of the water content of the slope soil is of great significance to grasp the stability of the slope soil.

[0003] In the prior art, slopes prone to landslides are mainly monitored by regular manual inspections, which makes it difficult to predict landslide disasters, and there is room for improvement. Utility Model Content

[0004] In order to monitor the slope in real time and reduce the losses caused by landslide disasters, the present application provides a fiber grating soil monitoring device.

[0005] The fiber grating soil monitoring device provided in this application adopts the following technical solution:

[0006] A fiber grating soil monitoring device comprises a demodulator, a plurality of strain fiber grating detection chains and a plurality of mounting parts, wherein the plurality of fiber grating detection chains respectively comprise a multi-core optical cable pre-buried under the slope surface of a slope to be monitored, the multi-core optical cable is respectively connected in series with a plurality of strain fiber grating sensors, the plurality of strain fiber grating sensors are respectively detachably mounted on the plurality of mounting parts, the plurality of mounting parts are inserted under the slope surface of the slope to be monitored, and the plurality of mounting parts are arranged in a linear array;

[0007] The output ends of the multi-core optical cables are all connected to the demodulator, which receives the reflected light reflected by the plurality of strain fiber grating sensors and outputs force sensing signals respectively, and the signal output end of the demodulator is connected to a signal processor, which receives the plurality of force sensing signals and generates a slope monitoring array;

[0008] The signal output end of the signal processor is connected to a display in the control room, and the display receives and displays the slope monitoring array;

[0009] The signal output end of the demodulator is also connected to a fire alarm host, which is located in a control room. The fire alarm host receives a number of the force sensing signals and alarms when the force on any of the fiber grating sensors changes too quickly.

[0010] By adopting the above technical scheme, during the monitoring process, the reflected light output by the fiber grating sensor under force is transmitted to the demodulator via the multi-core optical cable, the demodulator measures the pressure exerted on the mounting parts by the soil at each fiber grating sensor point, and generates a slope monitoring array through the signal processor; when a landslide disaster occurs on the slope to be monitored, the pressure exerted on the mounting parts by the sliding of the soil on the slope increases, and when the force on the fiber grating sensor on any mounting part changes too quickly, the fire alarm host sends out an alarm to prompt that a landslide has occurred on the slope; at the same time, relevant personnel in the control room can judge the force conditions of each point in the slope through the slope monitoring array displayed on the display in the control room, and locate the location where the landslide occurs, and at the same time, the flow direction of soil and rock during the landslide can be predicted according to the location of the landslide point, so that the flow direction of soil and rock in the landslide can be predicted while monitoring the landslide disaster, so as to facilitate timely adoption of relevant measures.

[0011] Preferably, it also includes an audible and visual alarm installed beside the slope to be monitored, and the signal input end of the audible and visual alarm is signal-connected to the signal output end of the fire alarm host.

[0012] By adopting the above technical solution, through the sound and light alarm installed on the side of the slope to be detected, when the fiber optic Bragg grating sensor on the mounting part at any point is subjected to abnormal force and there is a risk of landslide, the signal processor can control the sound and light alarm to emit a warning sound and flash, prompting the crowd on the slope to evacuate, thereby reducing the losses caused by the landslide disaster.

[0013] Preferably, a plurality of grooves are provided at intervals of a set length under the slope surface of the slope to be monitored, a plurality of optical cable protection tubes are pre-buried in the plurality of grooves, a plurality of optical fiber fusion packages and installation sleeves are fixedly installed on the plurality of optical cable protection tubes, and the installation sleeves are located beside the optical fiber fusion package;

[0014] The mounting member comprises an insertion rod, which is detachably mounted in the mounting sleeve, and a mounting groove is formed through the side wall of the insertion rod, and mounting plates are fixedly mounted at the upper and lower ends of the mounting groove, respectively, and the two ends of the strain fiber grating sensor are fixedly mounted on the two mounting plates, respectively;

[0015] The plurality of insertion rods are detachably installed in the plurality of installation sleeves, and the optical fibers at both ends of the plurality of strain fiber grating sensors are connected to the multi-core optical cable through the optical fiber fusion splicing package.

[0016] By adopting the above technical solution, the optical cable protection tube can provide effective protection for the multi-core optical cable. After the installer installs the fiber optic Bragg grating sensor on the mounting part, the installation rod can be plugged into the optical cable protection tube through the installation sleeve, and the fiber optic Bragg grating sensor can be connected to the multi-core optical cable through the optical fiber fusion package. The trench can then be filled and covered with soil to complete the installation of the fiber optic Bragg grating sensor.

[0017] Preferably, an internal thread is formed on the inner wall of the installation sleeve, a connecting portion is formed on the bottom of the insertion rod, an external thread is formed on the outer wall of the connecting portion, and the connecting portion is threadedly connected in the installation sleeve.

[0018] By adopting the above technical solution, the internal thread in the installation sleeve can facilitate the installer to connect the plug rod to the optical cable protection tube, which can improve the stability of the connection between the plug rod and the installation sleeve.

[0019] Preferably, a concrete layer is poured in the groove, the optical cable protection tube and the optical fiber fusion package are both located in the concrete layer, and the joint between the insertion rod and the installation sleeve is located in the concrete layer.

[0020] By adopting the above technical solution, the concrete layer can fix the position of the optical cable protection tube, the plug rod and the optical fiber fusion package, thereby improving the stability of the installation of the fiber grating sensor.

[0021] In summary, the fiber Bragg grating soil monitoring device of the present application has at least one of the following beneficial technical effects:

[0022] 1. During the monitoring process, the reflected light output by the FBG sensor is transmitted to the demodulator via a multi-core optical cable. The demodulator measures the pressure exerted by the soil at each FBG sensor point on the mounting part, and generates a slope monitoring array through a signal processor. When a landslide occurs on the slope to be monitored, the pressure exerted by the sliding of the soil on the slope on the mounting part increases. When the force on the FBG sensor on any mounting part changes too quickly, the fire alarm host issues an alarm to indicate that a landslide has occurred on the slope. At the same time, the relevant personnel in the control room can judge the force conditions at each point in the slope through the slope monitoring array displayed on the display in the control room, and locate the location of the landslide. At the same time, the flow direction of soil and rock during the landslide can be predicted according to the location of the landslide point. This can realize the monitoring of landslide disasters while predicting the flow direction of soil and rock in the landslide, so as to facilitate timely adoption of relevant measures.

[0023] 2. The concrete layer can fix the position of the optical cable protection tube, the plug rod and the optical fiber fusion package, thereby improving the stability of the installation of the fiber grating sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1It is a schematic diagram of an embodiment of the present application for demonstrating the overall connection structure of the monitoring device.

[0025] Figure 2 It is a schematic diagram of an embodiment of the present application for demonstrating the arrangement relationship of a strain fiber Bragg grating detection chain.

[0026] Figure 3 It is a schematic diagram of an embodiment of the present application for demonstrating the overall structure of a strain fiber Bragg grating detection chain.

[0027] Figure 4 It is a schematic diagram of an embodiment of the present application for illustrating the overall structure of the installation structure.

[0028] Explanation of the reference numerals in the accompanying drawings: 1. demodulator; 2. strain fiber grating detection chain; 21. multi-core optical cable; 22. strain fiber grating sensor; 3. mounting part; 31. plug rod; 32. mounting groove; 33. mounting plate; 4. slope to be monitored; 41. groove; 42. optical cable protection tube; 421. optical fiber fusion package; 422. mounting sleeve; 43. concrete layer. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-4 This application is described in further detail.

[0030] Example

[0031] The present application embodiment discloses a fiber Bragg grating soil monitoring device. Figure 1-Figure 4 , including a demodulator 1, a plurality of strain fiber Bragg grating detection chains 2 and a plurality of mounting parts 3, wherein the plurality of fiber Bragg grating detection chains respectively include a multi-core optical cable 21 pre-buried under the slope surface of the slope body 4 to be monitored, the multi-core optical cable 21 is respectively connected in series with a plurality of strain fiber Bragg grating sensors 22, the plurality of strain fiber Bragg grating sensors 22 are respectively detachably mounted on the plurality of mounting parts 3, the plurality of mounting parts 3 are inserted under the slope surface of the slope body 4 to be monitored, and the plurality of mounting parts 3 are arranged in a linear array.

[0032] The output ends of the multi-core optical cable 21 are connected to the demodulator 1, which receives reflected light reflected by several strain fiber grating sensors 22 and outputs force sensing signals respectively. The signal output end of the demodulator 1 is connected to a signal processor, which receives several force sensing signals and generates a slope monitoring array.

[0033] The signal output end of the signal processor is connected to a display in the control room, and the display receives the slope monitoring array and displays it.

[0034] The signal output end of the demodulator 1 is also connected to a fire alarm host, which is located in the control room. The fire alarm host receives a number of force sensing signals and alarms when the force on any fiber grating sensor changes too quickly.

[0035] During the monitoring process, the reflected light output by the fiber grating sensor is transmitted to the demodulator 1 via the multi-core optical cable 21. The soil at each fiber grating sensor point of the demodulator 1 forms pressure on the mounting member 3, and generates a slope monitoring array through the signal processor. When a landslide occurs in the slope 4 to be monitored, the pressure on the mounting member 3 increases due to the sliding of the soil on the slope. When the force on the fiber grating sensor on any mounting member 3 changes too quickly, the fire alarm host issues an alarm to indicate that a landslide has occurred on the slope.

[0036] At the same time, relevant personnel in the control room can judge the stress conditions of each point in the slope through the slope monitoring array displayed on the display in the control room, and locate the location of the landslide. At the same time, they can predict the flow direction of soil and rock during the landslide according to the location of the landslide point. While monitoring the landslide disaster, they can predict the flow direction of soil and rock in the landslide, so as to facilitate timely adoption of relevant measures.

[0037] It should be noted that the number of installed fiber grating sensors and the distance between the fiber grating sensors can be adjusted according to the area of ​​the slope to be monitored, which will not be limited or elaborated here.

[0038] The end of the multi-core optical cable 21 is connected to a pump light source, which is pre-buried under the slope surface of the slope body 4 to be monitored and powered by a solar power supply device, which will not be described in detail here.

[0039] Reference Figure 1 It also includes an audible and visual alarm installed on the side of the slope to be monitored, and the signal input end of the audible and visual alarm is connected to the signal output end of the fire alarm host.

[0040] By installing an audible and visual alarm on the side of the slope to be detected, when the fiber grating sensor on the mounting member 3 at any point is subjected to abnormal force and there is a risk of landslide, the signal processor can control the audible and visual alarm to emit warning sounds and flashes, prompting people on the slope to evacuate and reduce the losses caused by landslide disasters.

[0041] Reference Figure 3 and Figure 4 A plurality of grooves 41 are provided at set length intervals under the slope surface of the slope body 4 to be monitored, a plurality of optical cable protection tubes 42 are pre-buried in the plurality of grooves 41, a plurality of optical fiber fusion packages 421 and installation sleeves 422 are fixedly installed on the plurality of optical cable protection tubes 42, and the installation sleeves 422 are located beside the optical fiber fusion package 421.

[0042] The mounting member 3 includes an insert rod 31, which is detachably mounted in the mounting sleeve 422. A mounting groove 32 is formed through the side wall of the insert rod 31. Mounting plates 33 are fixedly mounted at the upper and lower ends of the mounting groove 32. Both ends of the strain fiber grating sensor 22 are fixedly mounted on the two mounting plates 33.

[0043] The plurality of plug rods 31 are detachably installed in the plurality of installation sleeves 422 , respectively. The optical fibers at both ends of the plurality of strain fiber grating sensors 22 are connected to the multi-core optical cable 21 through the optical fiber fusion splicing package 421 .

[0044] The optical cable protection tube 42 can provide effective protection for the multi-core optical cable 21. After the installer installs the fiber grating sensor on the mounting member 3, the installation rod can be inserted into the optical cable protection tube 42 through the installation sleeve 422, and the fiber grating sensor can be connected to the multi-core optical cable 21 through the optical fiber fusion package 421. The groove 41 can then be filled and covered with soil to complete the installation of the fiber grating sensor.

[0045] Referring to the figure, an internal thread is formed on the inner wall of the installation sleeve 422, a connecting portion is formed on the bottom of the insertion rod 31, an external thread is formed on the outer wall of the connecting portion, and the connecting portion is threadedly connected in the installation sleeve 422.

[0046] The internal thread in the installation sleeve 422 can facilitate the installer to connect the insertion rod 31 to the optical cable protection tube 42, and can improve the stability of the connection between the insertion rod 31 and the installation sleeve 422.

[0047] Reference Figure 3 and Figure 4 A concrete layer 43 is poured in the groove 41, the optical cable protection tube 42 and the optical fiber fusion package 421 are both located in the concrete layer 43, and the joint between the insertion rod 31 and the installation sleeve 422 is located in the concrete layer 43. The concrete layer 43 can fix the positions of the optical cable protection tube 42, the insertion rod 31 and the optical fiber fusion package 421, thereby improving the stability of the installation of the fiber grating sensor.

[0048] The implementation principle of a fiber Bragg grating soil monitoring device in the embodiment of the present application is as follows: during the monitoring process, the reflected light output by the fiber Bragg grating sensor is transmitted to the demodulator 1 via the multi-core optical cable 21, and the soil at each fiber Bragg grating sensor point of the demodulator 1 forms a pressure on the mounting member 3, and a slope monitoring array is generated through a signal processor; when a landslide disaster occurs on the slope 4 to be monitored, the pressure formed by the soil sliding down on the slope on the mounting member 3 increases, and when the force on the fiber Bragg grating sensor on any mounting member 3 changes too quickly, the fire alarm host sends an alarm to prompt that a landslide has occurred on the slope; at the same time, relevant personnel in the control room can judge the force conditions of each point in the slope through the slope monitoring array displayed on the display in the control room, and locate the location where the landslide occurs. At the same time, the flow direction of soil and rock during the landslide can be predicted according to the location of the landslide point, so that the flow direction of soil and rock in the landslide can be predicted while monitoring the landslide disaster, so as to facilitate timely adoption of relevant measures.

[0049] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A fiber Bragg grating soil monitoring device, characterized in that: The invention comprises a demodulator (1), a plurality of strain fiber Bragg grating detection chains (2) and a plurality of mounting parts (3), wherein the plurality of fiber Bragg grating detection chains respectively comprise a multi-core optical cable (21) pre-buried under the slope surface of a slope body (4) to be monitored, the multi-core optical cable (21) respectively being connected in series with a plurality of strain fiber Bragg grating sensors (22), the plurality of strain fiber Bragg grating sensors (22) respectively being detachably mounted on the plurality of mounting parts (3), the plurality of mounting parts (3) being inserted under the slope surface of the slope body (4) to be monitored, and the plurality of mounting parts (3) being arranged in a linear array; The output ends of the multi-core optical cable (21) are all connected to the demodulator (1), the demodulator (1) receives reflected light reflected by a plurality of the strain fiber grating sensors (22) and outputs force sensing signals respectively, and the signal output end of the demodulator (1) is connected to a signal processor, and the signal processor receives a plurality of the force sensing signals and generates a slope monitoring array; The signal output end of the signal processor is connected to a display in the control room, and the display receives and displays the slope monitoring array; The signal output end of the demodulator (1) is also signal-connected to a fire alarm host, which is located in a control room. The fire alarm host receives a number of force sensing signals and issues an alarm when the force on any of the fiber grating sensors changes too quickly.

2. A fiber Bragg grating soil monitoring device according to claim 1, characterized in that: It also includes an audible and visual alarm installed beside the slope to be monitored, and the signal input end of the audible and visual alarm is connected to the signal output end of the fire alarm host.

3. The fiber Bragg grating soil monitoring device according to claim 1, characterized in that: A plurality of grooves (41) are arranged at intervals of a set length under the slope surface of the slope body (4) to be monitored, a plurality of optical cable protection tubes (42) are respectively pre-buried in the plurality of grooves (41), a plurality of optical fiber fusion packages (421) and installation sleeves (422) are respectively fixedly installed on the plurality of optical fiber protection tubes (42), and the installation sleeves (422) are located beside the optical fiber fusion packages (421); The mounting member (3) comprises an insertion rod (31), the insertion rod (31) being detachably mounted in the mounting sleeve (422), a mounting groove (32) penetrating the side wall of the insertion rod (31), mounting plates (33) being fixedly mounted at the upper and lower ends of the mounting groove (32), and the two ends of the strain fiber grating sensor (22) being fixedly mounted on the two mounting plates (33) respectively; The plurality of insertion rods (31) are detachably mounted in the plurality of mounting sleeves (422), and the optical fibers at both ends of the plurality of strain fiber grating sensors (22) are connected to the multi-core optical cable (21) via the optical fiber fusion splicing package (421).

4. A fiber Bragg grating soil monitoring device according to claim 3, characterized in that: An internal thread is formed on the inner wall of the installation sleeve (422), a connecting portion is formed on the bottom of the insertion rod (31), an external thread is formed on the outer wall of the connecting portion, and the connecting portion is threadedly connected inside the installation sleeve (422).

5. The fiber Bragg grating soil monitoring device according to claim 4, characterized in that: A concrete layer (43) is poured in the groove (41), the optical cable protection tube (42) and the optical fiber fusion package (421) are both located in the concrete layer (43), and the joint between the insertion rod (31) and the installation sleeve (422) is located in the concrete layer (43).

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