Dam deformation and temperature fiber monitoring device and monitoring method thereof

Abstract

This invention discloses a fiber optic monitoring device and method for dam deformation and temperature, relating to the field of dam deformation monitoring technology. The device includes a pad and a left sand box. The left sand box is bolted to the pad, and wing plates are fixedly installed on both sides of the opening of the left sand box. A tray is fixedly installed at the bottom of the opening of the left sand box. Several wire-passing holes are arranged vertically at the closed end of the left sand box. In this application, the fiber optic monitoring device and method for dam deformation and temperature, through a dual-sand box linkage system, allows the left sand box to be fixed while the right sand box can move tangentially / vertically under the action of a composite moving component. This simulates the layered shear effect in actual engineering, verifies the monitoring capability of distributed fiber optic sensors for soil shear displacement, and simulates the cable-soil interaction during dam deformation. It is suitable for studying the mechanical behavior of soil under different stress conditions, and has significant application value, especially in geological disaster early warning and geotechnical structure safety assessment.

Description

Technical Field

[0001] This invention relates to the field of dam deformation monitoring technology, specifically to a fiber optic monitoring device and method for dam deformation and temperature. Background Technology

[0002] my country has complex geographical conditions, and landslides and other slope instability disasters occur frequently and affect a wide area. Geological disasters have become one of the most important natural disasters threatening people's lives and property and affecting the national economy and people's livelihood. Accurate and effective monitoring, early prediction, and timely prevention are undoubtedly the most effective ways to reduce disaster losses. Distributed, real-time, and remote acquisition of mechanical information inside geological bodies and timely and accurate judgment of abnormal states of rock and soil before disasters are the basic guarantees for effectively monitoring the stability of slopes, dams, tunnels, foundations, etc.

[0003] In traditional dam soil shear monitoring technology, point sensors are usually used to measure soil displacement and deformation. However, this method has problems such as limited monitoring points, inability to monitor continuously, and data accuracy being greatly affected by the environment. How to provide a multi-layer fiber optic monitoring device for soil shear to overcome the shortcomings of traditional monitoring methods, achieve comprehensive and accurate monitoring of soil shear deformation process, and obtain real-time information on minute deformations of soil during shearing is an urgent technical problem to be solved. Summary of the Invention

[0004] The purpose of this invention is to provide a fiber optic monitoring device and method for dam deformation and temperature, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a fiber optic monitoring device for dam deformation and temperature, comprising a pad and a left sand box, wherein the left sand box is bolted on the pad, and wing plates are fixedly installed on both sides of the opening of the left sand box, and a tray is fixedly installed at the bottom of the opening of the left sand box. Several wire holes are arranged vertically at the closed end of the left sand box, and a composite optical fiber passes through each wire hole, and the outer sides of the several composite optical fibers are electrically connected to a host computer.

[0006] Furthermore, a right sand box is arranged side by side on one side of the opening of the left sand box, and a fixing plate is fixedly installed on the closed end of the right sand box.

[0007] Furthermore, the openings of the left sand box and the right sand box are opposite each other, and the bottoms of the left sand box and the right sand box are initially on the same horizontal plane.

[0008] Furthermore, the left and right sand boxes are filled with three layers of sand, and each of the three layers of sand in the left and right sand boxes is equipped with a corresponding composite optical fiber.

[0009] Furthermore, the right sand box is mounted on the base, and a detachable groove plate is bolted to the side of the base. The two types of detachable groove plates are respectively provided with "Z"-shaped and "I"-shaped cam grooves.

[0010] Furthermore, a guide rod is fixedly connected inside the recess of the base, and a cylinder is bolted to the outside of the base.

[0011] Furthermore, a composite moving assembly is installed inside the base recess. The composite moving assembly includes a horizontal slider that is slidably mounted on the guide rods on both sides. A connector is fixedly installed in the middle of the horizontal slider, and the connector is bolted to the telescopic end of the cylinder. Guide holes are provided on both sides of the horizontal slider, and the horizontal slider slides with the corresponding guide rods through the guide holes on both sides.

[0012] Furthermore, the composite moving component also includes slide rods fixedly installed on both sides of the U-shaped recess of the horizontal slider. A lifting slider with the same U-shaped structure is installed on the slide rods, and the lifting slider is arranged opposite to the U-shaped recess of the horizontal slider.

[0013] Furthermore, the composite moving component also includes sliding holes on both sides of the lifting slider. The lifting slider slides in cooperation with the corresponding sliding rods through the sliding holes on both sides. The top plane of the lifting slider is fixed to the right sand box bolt. A sliding pin is fixedly connected to the bottom side of the lifting slider, and the sliding pin slides in cooperation with the cam groove of the corresponding shape on the detachable slot plate.

[0014] Furthermore, the monitoring method includes the following operational steps: Step 1: The test sand box of this application consists of two parts, a left sand box and a right sand box with opposite openings. During the test preparation stage, the sand is filled into the left sand box and the right sand box in layers, and the composite optical fiber is laid at different heights corresponding to the number of sand layers. The composite optical fiber passing through the wire hole at the closed end of the left sand box is connected to the data demodulation host computer for data acquisition. Step 2: Select two types of detachable slot plates for cam grooves, namely "Z" shaped and "I" shaped, according to actual testing requirements. The detachable slot plate of the "Z" shaped cam groove corresponds to the composite motion of the right sand box, which is superimposed in both tangential and vertical directions, while the detachable slot plate of the "I" shaped cam groove only corresponds to the tangential motion of the right sand box. Step 3: When using the detachable slot plate of the "Z" shaped cam groove, when the sliding pin is located in the straight section of the "Z" shaped cam groove, the horizontal slider moves tangentially along with the lifting slider through the sliding on the guide rods on both sides. When the sliding pin is located in the inclined section of the "Z" shaped cam groove, while the horizontal slider moves tangentially along with the lifting slider, the lifting slider also slides vertically through the sliding hole on the sliding rods on both sides of the lifting slider recess, so that the right sand box mounted on the top plane of the lifting slider performs a tangential / vertical composite motion. Step 4: During the experiment, a dual sand box linkage system is used, with the left sand box fixed and the right sand box moving tangentially / vertically under the action of the composite moving component. This simulates the layered shear effect in actual engineering, verifies the ability of the distributed fiber optic sensor to monitor soil shear displacement, and simulates the cable-soil interaction during dam deformation.

[0015] This invention provides a fiber optic monitoring device and method for dam deformation and temperature, which has the following beneficial effects; 1. In use, the test sand box of this application consists of two parts: a left sand box and a right sand box with opposite openings. During the test preparation stage, sand is filled into the left and right sand boxes in layers, and composite optical fibers are placed at different heights corresponding to the number of sand layers. The composite optical fiber passing through the wire hole at the closed end of the left sand box is connected to the data demodulation host computer for data acquisition. During the test, through the dual sand box linkage system, the left sand box is fixed while the right sand box can move tangentially / vertically under the action of the composite moving component, simulating the layered shear effect in actual engineering, verifying the monitoring capability of the distributed optical fiber sensor for soil shear displacement, simulating the cable-soil interaction during dam deformation, and is suitable for studying the mechanical behavior of soil under different stress conditions. It has important application value, especially in geological disaster early warning and geotechnical structure safety assessment.

[0016] 2. In use, the cylinder is activated to push the horizontal slider to move tangentially. A lifting slider is vertically slidably mounted on the slide rods on both sides of the horizontal slider's notch. The top plane of the lifting slider is fixed to the right sandbox bolt, and a sliding pin is fixedly connected to the bottom side of the lifting slider. When using the detachable slot plate of the "Z"-shaped cam groove, when the sliding pin is in the straight section of the "Z"-shaped cam groove, the horizontal slider, through the sliding on the guide rods on both sides, synchronously drives the lifting slider to move tangentially. When the sliding pin is in the inclined section of the "Z"-shaped cam groove, the horizontal slider, while driving the lifting slider to move tangentially... The lifting slider also slides vertically on the sliding rods located on both sides of the lifting slider recess via sliding holes, causing the right sand box mounted on the top plane of the lifting slider to perform a tangential / vertical composite motion. This application can select two types of detachable slot plates with "Z"-shaped and "I"-shaped cam grooves according to actual testing needs. The detachable slot plate with the "Z"-shaped cam groove corresponds to the composite motion of the right sand box with superimposed tangential and vertical motion, while the detachable slot plate with the "I"-shaped cam groove only corresponds to the tangential motion of the right sand box. Moreover, only one cylinder is needed as the power source to drive the tangential / vertical composite motion of the right sand box, and the structural linkage between devices is strong. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall right-side structure of the device of the present invention; Figure 2 This is a schematic diagram of the overall left-side structure of the device of the present invention; Figure 3This is a schematic cross-sectional view of the left and right sand boxes of the present invention; Figure 4 This is a schematic diagram of part of the structure of the device of the present invention; Figure 5 This is a schematic diagram of the exploded structure of the composite moving component of the present invention; Figure 6 This is a cross-sectional view of the composite moving component of the present invention.

[0018] In the diagram: 1. Pad; 2. Left sand box; 3. Wing plate; 4. Tray; 5. Cable hole; 6. Composite optical fiber; 7. Host computer; 8. Right sand box; 9. Fixing plate; 10. Base; 11. Detachable slot plate; 12. Cam groove; 13. Guide rod; 14. Cylinder; 15. Composite moving assembly; 1501. Horizontal slider; 1502. Connector; 1503. Guide hole; 1504. Slide rod; 1505. Lifting slider; 1506. Slide hole; 1507. Slide pin. Detailed Implementation

[0019] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention. Please see Figures 1 to 3 This invention provides a technical solution: a fiber optic monitoring device for dam deformation and temperature, comprising a pad 1 and a left sand box 2. The left sand box 2 is bolted to the pad 1, and wing plates 3 are fixedly installed on both sides of the opening of the left sand box 2. A tray 4 is fixedly installed at the bottom of the opening of the left sand box 2. Several wire holes 5 are arranged vertically at the closed end of the left sand box 2, and a composite optical fiber 6 passes through each wire hole 5. The outer sides of the composite optical fibers 6 are electrically connected to a host computer 7. A right sand box 8 is arranged side by side on one side of the opening of the left sand box 2, and a fixing plate 9 is fixedly installed at the closed end of the right sand box 8. The openings of the left sand box 2 and the right sand box 8 are opposite each other, and the bottoms of the left sand box 2 and the right sand box 8 are initially on the same horizontal plane. The left sand box 2 and the right sand box 8 are filled with three layers of sand, and the three layers of sand in the left sand box 2 and the right sand box 8 are respectively installed with corresponding composite optical fibers 6. The specific operation is as follows: The test sand box of this application consists of two parts, a left sand box 2 and a right sand box 8 with opposite openings. During the test preparation stage, sand is filled into the left sand box 2 and the right sand box 8 in layers, and composite optical fibers 6 are arranged at different heights corresponding to the number of sand layers. The composite optical fiber 6 passing through the wire hole 5 at the closed end of the left sand box 2 is connected to the data demodulation host computer 7 for data acquisition. During the test, through the dual sand box linkage system, the left sand box 2 is fixed while the right sand box 8 can move tangentially / vertically under the action of the composite moving component 15 to simulate the layered shear effect in actual engineering, verify the monitoring capability of the distributed optical fiber sensor for soil shear displacement, simulate the cable-soil interaction during dam deformation, and is suitable for studying the mechanical behavior of soil under different stress conditions. It has important application value, especially in geological disaster early warning and geotechnical structure safety assessment. Please see Figures 4 to 6 The right sand box 8 is mounted on the base 10, and a detachable slot plate 11 is bolted to the side of the base 10. Two types of detachable slot plates 11 are respectively provided with "Z"-shaped and "I"-shaped cam grooves 12. A guide rod 13 is fixedly connected inside the recess of the base 10, and a cylinder 14 is bolted to the outside of the base 10. A composite moving assembly 15 is installed inside the recess of the base 10. The composite moving assembly 15 includes a horizontal slider 1501 slidably mounted on the guide rods 13 on both sides. A connector 1502 is fixedly mounted in the middle of the horizontal slider 1501, and the connector 1502 is bolted to the telescopic end of the cylinder 14. Guide holes 1503 are provided through both sides of the horizontal slider 1501, and the horizontal slider 1501 is connected to the corresponding guide rod 13 through the guide holes 1503 on both sides. 3. Sliding engagement: The composite moving assembly 15 also includes slide rods 1504 fixedly installed on both sides of the "U"-shaped recess of the horizontal slider 1501. A lifting slider 1505 with the same "U"-shaped structure is installed on the slide rods 1504, and the lifting slider 1505 is arranged opposite to the "U"-shaped recess of the horizontal slider 1501. The composite moving assembly 15 also includes sliding holes 1506 on both sides of the lifting slider 1505. The lifting slider 1505 slides with the corresponding slide rods 1504 through the sliding holes 1506 on both sides. The top plane of the lifting slider 1505 is bolted to the right sand box 8. A sliding pin 1507 is fixedly connected to the bottom side of the lifting slider 1505, and the sliding pin 1507 slides with the cam groove 12 of the corresponding shape on the detachable slot plate 11. The specific operation is as follows: Cylinder 14 is activated, pushing the horizontal slider 1501 to move tangentially. A lifting slider 1505 is vertically slidably mounted on the slide rods 1504 on both sides of the recess of the horizontal slider 1501. The top plane of the lifting slider 1505 is bolted to the right sand box 8, and a sliding pin 1507 is fixedly connected to the bottom side of the lifting slider 1505. When using the detachable slot plate 11 of the "Z"-shaped cam groove 12, when the sliding pin 1507 is in the straight section of the "Z"-shaped cam groove 12, the horizontal slider 1501, through sliding on the guide rods 13 on both sides, synchronously drives the lifting slider 1505 to move tangentially together. When the sliding pin 1507 is in the inclined section of the "Z"-shaped cam groove 12, the horizontal slider 1501, while driving the lifting slider 1505... While 505 moves tangentially, the lifting slider 1505 also slides vertically on the sliding rods 1504 located on both sides of the recess of the lifting slider 1505 through the sliding hole 1506, so that the right sand box 8 mounted on the top plane of the lifting slider 1505 performs a tangential / vertical composite motion. This application can select the detachable slot plate 11 of the "Z"-shaped and "I"-shaped cam groove 12 according to the actual test requirements. The detachable slot plate 11 of the "Z"-shaped cam groove 12 corresponds to the composite motion of the right sand box 8 with the tangential and vertical directions superimposed, while the detachable slot plate 11 of the "I"-shaped cam groove 12 only corresponds to the tangential motion of the right sand box 8. Moreover, only one cylinder 14 is needed as the power to realize the tangential / vertical composite motion drive of the right sand box 8, and the structural linkage between the devices is strong.

[0020] In summary, the monitoring methods for the fiber optic monitoring equipment for dam deformation and temperature are as follows: Step 1: The test sand box of this application consists of two parts, a left sand box 2 and a right sand box 8 with opposite openings. During the test preparation stage, sand is filled into the left sand box 2 and the right sand box 8 in layers, and composite optical fibers 6 are laid at different heights corresponding to the number of sand layers. The composite optical fiber 6 passing through the wire hole 5 at the closed end of the left sand box 2 is connected to the data demodulation host computer 7 for data acquisition. Step 2: Select the detachable slot plate 11 of the "Z" shaped and "I" shaped cam groove 12 according to the actual test requirements. The detachable slot plate 11 of the "Z" shaped cam groove 12 corresponds to the composite motion of the right sand box 8, which is superimposed in both tangential and vertical directions, while the detachable slot plate 11 of the "I" shaped cam groove 12 only corresponds to the tangential motion of the right sand box 8. Step 3: When using the detachable slot plate 11 of the "Z" shaped cam groove 12, when the sliding pin 1507 is located in the straight section of the "Z" shaped cam groove 12, the horizontal slider 1501 slides on the guide rods 13 on both sides, and simultaneously drives the lifting slider 1505 to move tangentially together. When the sliding pin 1507 is located in the inclined section of the "Z" shaped cam groove 12, while the horizontal slider 1501 drives the lifting slider 1505 to move tangentially together, the lifting slider 1505 also slides vertically on the sliding rods 1504 on both sides of the recess of the lifting slider 1505 through the sliding hole 1506, so that the right sand box 8 installed on the top plane of the lifting slider 1505 performs a tangential / vertical compound movement. Step 4: During the test, the left sand box 2 is fixed while the right sand box 8 can move tangentially / vertically under the action of the composite moving component 15 through the dual sand box linkage system. This simulates the layered shear effect in actual engineering, verifies the monitoring capability of the distributed optical fiber sensor for soil shear displacement, and simulates the cable-soil interaction during dam deformation.

[0021] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0022] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only for the purpose of helping to understand the method and core ideas of the present invention. The above are only preferred embodiments of the present invention. It should be noted that due to the limitations of textual expression, and the existence of an infinite number of specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of the present invention.

Claims

1. A fiber optic monitoring device for dam deformation and temperature, comprising a pad (1) and a left sand box (2), characterized in that, The left sand box (2) is bolted on the pad (1), and wing plates (3) are fixedly installed on both sides of the opening of the left sand box (2). A tray (4) is fixedly installed at the bottom of the opening of the left sand box (2). Several wire holes (5) are arranged vertically at the closed end of the left sand box (2), and a composite optical fiber (6) passes through each wire hole (5). The outer sides of the several composite optical fibers (6) are electrically connected to the host computer (7). The right sand box (8) is arranged side by side on the opening side of the left sand box (2), and a fixing plate (9) is fixedly installed on the closed end of the right sand box (8). The openings of the left sand box (2) and the right sand box (8) are opposite each other, and the bottoms of the left sand box (2) and the right sand box (8) are on the same horizontal plane in the initial stage; the left sand box (2) and the right sand box (8) are filled with three layers of sand, and the three layers of sand in the left sand box (2) and the right sand box (8) are respectively equipped with corresponding composite optical fibers (6). The right sand box (8) is set on the base (10), and the base (10) is bolted to the side end with a detachable slot plate (11). The detachable slot plate (11) is divided into two types, and is provided with "Z" shaped and "I" shaped cam slots (12). A guide rod (13) is fixedly connected inside the recess of the base (10), and a cylinder (14) is bolted to the outside of the base (10). The base (10) has a recessed cavity in which a composite moving assembly (15) is installed. The composite moving assembly (15) includes a horizontal slider (1501) that is slidably mounted on the two guide rods (13). A connector (1502) is fixedly mounted in the middle of the horizontal slider (1501), and the connector (1502) is bolted to the telescopic end of the cylinder (14). Guide holes (1503) are provided on both sides of the horizontal slider (1501), and the horizontal slider (1501) slides with the corresponding guide rod (13) through the guide holes (1503) on both sides. The composite moving component (15) further includes a slide rod (1504) fixedly installed on both sides of the "U" shaped recess of the horizontal slider (1501). A lifting slider (1505) with the same "U" shaped structure is installed on the slide rod (1504), and the lifting slider (1505) is arranged opposite to the "U" shaped recess of the horizontal slider (1501). The composite moving component (15) also includes sliding holes (1506) on both sides of the lifting slider (1505). The lifting slider (1505) is slidably engaged with the corresponding sliding rod (1504) through the sliding holes (1506) on both sides. The top plane of the lifting slider (1505) is bolted to the right sand box (8). The bottom side of the lifting slider (1505) is fixedly connected with a sliding pin (1507), and the sliding pin (1507) is slidably engaged with the cam groove (12) of the corresponding shape on the detachable slot plate (11).

2. A monitoring method using the fiber optic monitoring equipment for dam deformation and temperature as described in claim 1, characterized in that: The monitoring method includes the following steps: Step 1: The test sand box consists of two parts, a left sand box (2) and a right sand box (8) with opposite openings. During the test preparation stage, the sand is filled into the left sand box (2) and the right sand box (8) in layers, and the composite optical fiber (6) is laid at different heights corresponding to the number of sand layers. The composite optical fiber (6) passing through the wire hole (5) at the closed end of the left sand box (2) is connected to the data demodulation host computer (7) for data acquisition. Step 2: Select the detachable slot plate (11) of the "Z" shaped and "I" shaped cam groove (12) according to the actual test requirements. The detachable slot plate (11) of the "Z" shaped cam groove (12) corresponds to the composite motion of the right sand box (8) with the tangential and vertical superposition, while the detachable slot plate (11) of the "I" shaped cam groove (12) only corresponds to the tangential motion of the right sand box (8). Step 3: When using the detachable slot plate (11) of the "Z" shaped cam groove (12), when the sliding pin (1507) is located in the straight section of the "Z" shaped cam groove (12), the horizontal slider (1501) drives the lifting slider (1505) to move tangentially together through the sliding on the guide rods (13) on both sides. When the sliding pin (1507) is located in the inclined section of the "Z" shaped cam groove (12), while the horizontal slider (1501) drives the lifting slider (1505) to move tangentially together, the lifting slider (1505) also slides vertically through the sliding hole (1506) on the sliding rod (1504) on both sides of the notch of the lifting slider (1505), so that the right sand box (8) installed on the top plane of the lifting slider (1505) performs a tangential / vertical compound motion. Step 4: During the test, the left sand box (2) is fixed and the right sand box (8) can move along the tangential vertical direction under the action of the composite moving component (15) through the dual sand box linkage system to simulate the layered shear effect in actual engineering, verify the monitoring capability of the distributed optical fiber sensor for soil shear displacement, and simulate the cable-soil interaction when the dam is deformed.

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