A tunnel monitoring device

Abstract

The application relates to a tunnel monitoring device which comprises a sensing module, a signal conversion module and a terminal device. The tunnel comprises a tunnel hole and a support layer formed along the edge of the tunnel hole. The sensing module comprises a sensing rod and a sensing body. The sensing rod is laid on the support layer. The sensing body comprises a sensitive part, a first fiber grating group and a second fiber grating group arranged on the sensitive part. The sensitive part is connected with the sensing rod and deforms with the movement of the sensing rod. The first fiber grating group collects a first strain of the sensitive part along a first direction, and the second fiber grating group collects a second strain of the sensitive part along a second direction. The first direction is perpendicular to the second direction in a horizontal plane. The signal conversion module is in communication connection with the first fiber grating group and the second fiber grating group, and converts the optical signal into an electrical signal. The terminal device is in communication connection with the signal conversion module, displays the first strain and the second strain of the received electrical signal, and the accuracy of reflecting the tunnel deformation by using the fiber grating to collect the strain is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnel monitoring, in particular to a tunnel monitoring device. BACKGROUND

[0002] In order to facilitate people's travel, it is an optimal choice to connect the land which is inconvenient to repair the road or the island which is inconvenient to build a bridge by using a tunnel, which can be the connection of land and land, land and island, and island and island.

[0003] However, as the tunnel operation time increases, the tunnel is prone to deformation and settlement such as cracking and water leakage, thereby threatening the operation safety of the tunnel. Especially for large-scale underwater tunnels, the safety is of great importance, therefore, it is of great significance to health monitor the tunnel structure and obtain real-time monitoring data of the tunnel structure, so as to evaluate the safety of the tunnel structure condition by using the real-time monitoring data, which is important for the later maintenance and maintenance of the tunnel structure.

[0004] At present, the traditional methods such as precision level, total station, GPS method and three-dimensional laser scanning are usually used to monitor the deformation and settlement of the tunnel in China, but the precision level and total station need to be read by artificial, and the measurement results will be affected by human factors; GPS cannot find the deformation of the monitored object in the longitudinal direction, and is easily affected by the weather, which has great limitations in actual application; three-dimensional laser scanning is easily affected by external light and other factors in the monitoring process, resulting in large measurement result error and inaccuracy. SUMMARY

[0005] Therefore, it is necessary to provide a tunnel monitoring device aiming at the problem that the monitoring data of the tunnel structure is not accurate.

[0006] A tunnel monitoring device for monitoring a tunnel, the tunnel comprising a tunnel hole and a support layer formed along the edge of the tunnel hole, the tunnel monitoring device comprising a sensing module, a signal conversion module and a terminal device, wherein:

[0007] The sensing module comprises a sensing rod and a sensing body, the sensing rod is laid on the support layer, the sensing body comprises a sensitive part and a first fiber grating group and a second fiber grating group arranged on the sensitive part, the sensitive part is connected with the sensing rod and deforms with the movement of the sensing rod, the first fiber grating group is used for collecting a first strain of the sensitive part along a first direction, the second fiber grating group is used for collecting a second strain of the sensitive part along a second direction, and the first direction is perpendicular to the second direction in the horizontal plane;

[0008] The signal conversion module is in communication connection with the first fiber grating group and the second fiber grating group, and is used for converting the first strain variable of the optical signal and the second strain variable of the optical signal into the first strain variable of the electrical signal and the second strain variable of the electrical signal in one-to-one correspondence.

[0009] The terminal device is in communication connection with the signal conversion module, and is used for displaying the first strain variable and the second strain variable of the received electrical signal.

[0010] The tunnel monitoring device, by setting the first fiber grating group and the second fiber grating group, collects the first strain variable and the second strain variable of the sensitive member in the first direction and the second direction, i.e., the X direction and the Y direction, to reflect the deformation in the horizontal plane of the tunnel in real time, and the signal conversion module and the terminal device display the collected first strain variable and the second strain variable, thereby realizing remote automatic real-time monitoring of the tunnel. Compared with the manual reading of data by the precision level gauge and the total station, the application avoids manual reading, so that the measured data is not affected by human factors. Compared with the current method of monitoring the deformation of the tunnel by the GPS method, the application realizes monitoring of the deformation in the longitudinal direction of the tunnel, i.e., the Y direction, and the fiber grating is made of silica material and is resistant to corrosion, so it can work in harsh environments and is not affected by the weather. Compared with the current method of monitoring the deformation of the tunnel by the three-dimensional laser scanning, the fiber grating is not affected by the light source, and the fiber grating has high sensitivity to strain, so the first fiber grating group and the second fiber grating group are used to collect the first strain variable and the second strain variable of the sensitive member in the X direction and the Y direction to reflect the deformation in the horizontal plane of the tunnel in real time, so that the accuracy and accuracy of the measurement result are high.

[0011] In one of the embodiments, a data processing module is further included, which is in communication connection with the signal conversion module and is used for processing the first strain variable of the electrical signal to obtain a first deformation variable and processing the second strain variable of the electrical signal to obtain a second deformation variable.

[0012] The terminal device is in communication connection with the data processing module and is used for displaying the received first deformation variable and second deformation variable.

[0013] In one of the embodiments, the first fiber grating group includes a first fiber grating and a second fiber grating, the first fiber grating and the second fiber grating are arranged in one-to-one correspondence on the first side and the second side of the sensitive member along the first direction, the first fiber grating generates a first center wavelength shift amount with the strain of the first side, and the second fiber grating generates a second center wavelength shift amount with the strain of the second side.

[0014] The signal conversion module is in communication connection with the first fiber grating and the second fiber grating, and is configured to receive and transmit the first center wavelength shift and the second center wavelength shift to the data processing module after signal processing.

[0015] The data processing module is configured to obtain the first deformation inclination angle by subtracting the second center wavelength shift from the first center wavelength shift.

[0016] In one of the embodiments, the second fiber grating group includes a third fiber grating and a fourth fiber grating, the third fiber grating and the fourth fiber grating are arranged on the third side and the fourth side of the sensitive member along the second direction one by one, the third fiber grating generates a third center wavelength shift with the strain of the third side, and the fourth fiber grating generates a fourth center wavelength shift with the strain of the fourth side.

[0017] The signal conversion module is in communication connection with the third fiber grating and the fourth fiber grating, and is configured to receive and transmit the third center wavelength shift and the fourth center wavelength shift to the data processing module after signal processing.

[0018] The data processing module is configured to obtain the second deformation inclination angle by subtracting the fourth center wavelength shift from the third center wavelength shift.

[0019] In one of the embodiments, a first cavity is formed in the sensing rod, one end of the sensitive member is connected to the sensing rod, and the other end of the sensitive member is suspended in the first cavity.

[0020] In one of the embodiments, the sensing body further includes a counterweight, the counterweight is connected to the end of the sensitive member away from the sensing rod.

[0021] In one of the embodiments, the number of the sensing bodies is multiple, and the multiple sensing bodies are distributed along the length direction of the sensing rod.

[0022] In one of the embodiments, a settlement sensing plate is further included, the settlement sensing plate is laid on the support layer, and the side of the settlement sensing plate away from the support layer is laid with the sensing rod.

[0023] In one of the embodiments, a protective cover is further included, the protective cover is arranged on the side of the sensing rod away from the settlement sensing plate.

[0024] In one of the embodiments, sand is further included, the sand is laid between the settlement sensing plate and the protective cover, and the sensing rod is arranged in the sand. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 A schematic view of a tunnel monitoring device provided by the present application is installed in a tunnel;

[0026] Figure 2 A schematic view of a sensing module provided by the present application is installed in a tunnel; Figure 1 A schematic view of a sensing module provided by the present application is installed in a tunnel;

[0027] Figure 3 A schematic view of a sensing module provided by the present application is installed in a tunnel; Figure 2 A schematic view of a sensing module provided by the present application is installed in a tunnel;

[0028] Figure 4 A schematic view of a sensing module provided by the present application is installed in a tunnel; Figure 1 A schematic view of a sensing module provided by the present application is installed in a tunnel;

[0029] Figure 5 A schematic view of a sensing module provided by the present application is installed in a tunnel; Figure 1 A schematic view of a sensing module provided by the present application is installed in a tunnel;

[0030] Figure 6 A schematic view of a sensing module provided by the present application is installed in a tunnel; Figure 2 A schematic view of a sensing module provided by the present application is installed in a tunnel;

[0031] Figure 7 A schematic view of a sensing module provided by the present application is installed in a tunnel; Figure 2 A schematic view of a sensing module provided by the present application is installed in a tunnel;

[0032] Figure 8 A schematic view of a sensing module provided by the present application is installed in a tunnel;

[0033] Wherein:

[0034] 10, tunnel monitoring device; 20, tunnel; 21, tunnel hole; 22, support layer; a, first direction; b, second direction;

[0035] 100, sensing module; 110, sensing rod; 111, first cavity; 112, mounting hole; 120, sensing body; 121, sensitive part; 122, first fiber grating group; 1221, first fiber grating; 1222, second fiber grating; 123, second fiber grating group; 1231, third fiber grating; 1232, fourth fiber grating; 124, counterweight; 125, top cover; 126, first through hole;

[0036] 200, signal conversion module; 210, transmission optical cable;

[0037] 300, terminal device; 310, data line;

[0038] 400, settlement sensing plate; 500, protective cover; 600, sandy soil. DETAILED DESCRIPTION

[0039] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the specific embodiments of the present application will be described below in detail with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in many different manners without the specific details, and it is to be understood that the present application is not limited to the specific embodiments described below and that the specific embodiments are given for the purposes of exemplification only.

[0040] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0041] In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0042] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be direct contact between the first and second features, or indirect contact between the first and second features through intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0044] It is to be understood that when an element as a preamble is referred to as being "on" or "disposed on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements can also be present. As used herein the terms "vertical", "horizontal", "upper", "lower", "left", "right", and the like as well as their derivatives, refer to the orientation of the figure and not to the orientation of the device or element being described.

[0045] Referring to Figure 1 , Figure 2 and Figure 3 , an embodiment of the present application provides a tunnel monitoring device 10, which is used for monitoring the structural state of a tunnel 20, and people use the monitoring data to evaluate the safety of the tunnel 20 structure, so as to make timely response to the maintenance and repair of the tunnel 20, the tunnel 20 includes a tunnel hole 21 and a support layer 22 formed along the edge of the tunnel hole 21, and the tunnel monitoring device 10 includes a sensing module 100, a signal conversion module 200 and a terminal device, in specific use, the tunnel hole 21 can be used for people to pass through the seabed, and the support layer 22 is generally composed of surrounding rock and plays a supporting role on the tunnel hole 21, wherein:

[0046] The perception module 100 comprises a perception rod 110 laid on the support layer 22 and a sensing body 120 comprising a sensitive member 121 and a first fiber grating group 122 and a second fiber grating group 123 arranged on the sensitive member 121, the sensitive member 121 is connected with the perception rod 110, the sensitive member 121 deforms with the movement of the perception rod 110, the first fiber grating group 122 is used for collecting a first strain of the sensitive member 121 along a first direction a, the second fiber grating group 123 is used for collecting a second strain of the sensitive member 121 along a second direction b, the first direction a and the second direction b are perpendicular in the horizontal plane, in the specific arrangement, the material of the sensitive member 121 is a flexible material, generally an elastic member, the first direction a is the X direction, and the second direction b is the Y direction, through the above arrangement, when the tunnel 20 deforms, the perception rod 110 will move with the deformation of the support layer 22 in the tunnel 20, the sensitive member 121 will deform with the movement of the perception rod 110 with the deformation of the support layer 22, and the application uses the first fiber grating group 122 and the second fiber grating group 123 to collect the first strain and the second strain of the sensitive member 121 in the X direction and the Y direction to reflect the deformation of the tunnel 20 in the horizontal plane in real time, and the first fiber grating group 122 and the second fiber grating group 123 collect the strain of the sensitive member 121 by moving the wavelength when the sensitive member 121 deforms, and the wavelength movement of the first fiber grating group 122 and the second fiber grating group 123 represents the strain of the sensitive member 121;

[0047] The signal conversion module 200 is in communication connection with the first fiber grating group 122 and the second fiber grating group 123, and is used for converting the first strain of the optical signal and the second strain of the optical signal into the first strain of the electrical signal and the second strain of the electrical signal in one-to-one correspondence, in the specific arrangement, generally, the first fiber grating group 122 and the second fiber grating group 123 are connected in series as a whole through a transmission optical cable and then are in communication connection with the signal conversion module 200, the signal conversion module 200 is a fiber grating demodulator, the fiber grating demodulator is connected with the first fiber grating group 122 and the second fiber grating group 123 through a transmission optical cable 210, the transmission optical cable 210 can realize long-distance transmission of the optical signal, and the first fiber grating group 122 and the second fiber grating group 123 represent the strain of the sensitive member 121 by moving the wavelength of itself when the sensitive member 121 deforms, and the fiber grating demodulator is needed to convert the strain of the optical signal into the strain of the electrical signal and then continue the subsequent monitoring operation;

[0048] The terminal device is in communication connection with the signal conversion module 200, and the terminal device is used to display the first strain variable of the received electric signal and the second strain variable of the electric signal. Through the above setting, the terminal device is connected with the signal conversion module 200 by using a data line, so that people can analyze and evaluate the safety condition of the tunnel 20 structure by the displayed data.

[0049] The tunnel monitoring device 10 collects the first strain variable and the second strain variable of the sensitive member 121 in the first direction a and the second direction b, i.e., the X direction and the Y direction, by setting the first fiber grating group 122 and the second fiber grating group 123, so as to reflect the deformation in the horizontal plane of the tunnel 20 in real time. The signal conversion module 200 and the terminal device display the collected first strain variable and second strain variable, so as to realize the remote automatic real-time monitoring of the tunnel 20. Compared with the manual reading of data by using the precision level gauge and the total station, the application avoids the manual reading, so that the measured data is not affected by human factors. Compared with the method of monitoring the deformation of the tunnel 20 by using the GPS method, the application realizes the monitoring of the deformation of the tunnel 20 in the longitudinal direction, i.e., the Y direction, and the fiber grating is made of silica material and is resistant to corrosion, so as to work in a harsh environment and is not affected by the weather. Compared with the method of monitoring the deformation of the tunnel 20 by using the three-dimensional laser scanning, the fiber grating is not affected by the light source, and the fiber grating has high sensitivity to strain. Therefore, the first fiber grating group 122 and the second fiber grating group 123 collect the first strain variable and the second strain variable of the sensitive member 121 in the X direction and the Y direction, so as to reflect the deformation in the horizontal plane of the tunnel 20 in real time, so that the measurement result has high precision and accuracy.

[0050] In order for people to conveniently analyze data, a preferred embodiment, the tunnel monitoring device 10 further comprises a data processing module 300, the data processing module 300 is in communication connection with the signal conversion module 200, the data processing module 300 is used to obtain a first deformation variable after processing the first strain variable of the electric signal, the data processing module 300 is used to obtain a second deformation variable after processing the second strain variable of the electric signal. In the specific setting, the data processing module 300 is connected with the signal conversion module 200 through a data line 310, and the data processing module 300 can be a host computer in a computer. Through the above setting, the data processing module 300 can record the first strain variable, the first deformation variable, the second strain variable and the second deformation variable.

[0051] The terminal device is in communication connection with the data processing module 300, and the terminal device is used to display the received first deformation variable and second deformation variable. In a specific setting, in addition to using the terminal device, the online monitoring system can also be in communication connection with the data processing module 300, and the online monitoring system is used to reflect the relevant data processed by the data processing module 300. The terminal device in the present application can be a display device, and the deformation of the tunnel 20 in the horizontal plane can be more intuitively obtained. The terminal device can also be used to display the first strain variable and the second strain variable for people to conduct more detailed data analysis.

[0052] In combination Figure 4 As shown, in order to enable the first fiber grating group 122 to better collect the first strain variable of the sensitive member 121 along the first direction a, specifically, the first fiber grating group 122 includes a first fiber grating 1221 and a second fiber grating 1222, the first fiber grating 1221 and the second fiber grating 1222 are arranged one by one on the first side and the second side of the sensitive member 121 along the first direction a, the first fiber grating 1221 generates a first center wavelength shift amount with the strain of the first side, and the second fiber grating 1222 generates a second center wavelength shift amount with the strain of the second side. In a specific setting, the sensitive member 121 can be a square body structure, and the first fiber grating 1221 and the second fiber grating 1222 are arranged at the centers of the two side surfaces arranged opposite to each other along the first direction a in the sensitive member 121;

[0053] The signal conversion module 200 is in communication connection with the first fiber grating 1221 and the second fiber grating 1222, and is used to accept and deliver the first center wavelength shift amount and the second center wavelength shift amount after signal processing to the data processing module 300. In a specific setting, generally, the first fiber grating 1221 and the second fiber grating 1222 are connected in series as a whole by using an optical cable and are in communication connection with the signal conversion module 200. Through the above setting, the optical signal is converted into an electrical signal by using a fiber grating demodulator;

[0054] The data processing module 300 is configured to subtract the first central wavelength shift from the second central wavelength shift to obtain a first deformation inclination angle. According to the above arrangement, the first fiber grating 1221 and the second fiber grating 1222 are located at the centers of two symmetrical sides of the sensitive member 121, and when the sensitive member 121 deforms, the strains of the two light equations corresponding to the two sides are equal, and the wavelength shifts are opposite. However, the first fiber grating 1221 and the second fiber grating 1222 are also sensitive to temperature, and the same direction wavelength shift occurs when the first fiber grating 1221 and the second fiber grating 1222 are affected by temperature. That is, the opposite wavelength shifts of the first fiber grating 1221 and the second fiber grating 1222 are the coupled wavelength shifts after the temperature and strain are simultaneously responded. The opposite wavelength shifts are used as the difference to reflect the inclination angle change of the sensitive member 121 along the first direction a, and the influence of temperature on the first fiber grating group 122 is eliminated.

[0055] In combination Figure 5 As shown in FIG. 1, in order to better collect the second strain of the sensitive member 121 along the second direction b, specifically, the second fiber grating group 123 includes a third fiber grating 1231 and a fourth fiber grating 1232. The third fiber grating 1231 and the fourth fiber grating 1232 are arranged on the third side and the fourth side of the sensitive member 121 along the second direction b one by one. The third fiber grating 1231 generates a third central wavelength shift with the strain of the third side, and the fourth fiber grating 1232 generates a fourth central wavelength shift with the strain of the fourth side. In a specific arrangement, the sensitive member 121 can be a square body structure, and the third fiber grating 1231 and the fourth fiber grating 1232 are arranged at the centers of the two opposite sides of the sensitive member 121 along the second direction b.

[0056] The signal conversion module 200 is in communication connection with the third fiber grating 1231 and the fourth fiber grating 1232, and is configured to receive and process the third central wavelength shift and the fourth central wavelength shift signals and then transmit them to the data processing module 300. In a specific arrangement, the third fiber grating 1231 and the fourth fiber grating 1232 are connected in series by an optical cable and then connected to the signal conversion module 200.

[0057] The data processing module 300 is configured to subtract the third central wavelength shift from the fourth central wavelength shift to obtain a second deformation inclination angle. The arrangement of the second fiber grating group 123 is the same as that of the first fiber grating group 122. Not only is the influence of temperature on the second fiber grating group 123 eliminated, but also the inclination angle change of the sensitive member 121 along the second direction b is obtained.

[0058] In combination Figure 6 And Figure 7As shown, in order to facilitate the deformation of the sensing element 121 with the movement of the sensing rod 110, a preferred embodiment is that a first cavity 111 is formed inside the sensing rod 110, one end of the sensing element 121 is connected with the sensing rod 110, and the other end of the sensing element 121 is suspended in the first cavity 111.

[0059] In order to make the sensing element 121 quickly deform with the movement of the sensing rod 110, specifically, the sensing body 120 further comprises a counterweight 124 connected with the end of the sensing element 121 away from the sensing rod 110. Through the above arrangement, when the sensing rod 110 moves with the deformation of the tunnel 20, the counterweight 124 in the sensing rod 110 can quickly cause the corresponding deformation of the sensing element 121 with the change of position.

[0060] In order to facilitate real-time monitoring of the entire tunnel 20, more specifically, the number of sensing bodies 120 is multiple, and the multiple sensing bodies 120 are distributed along the length direction of the sensing rod 110. In the specific arrangement, the sensing rod 110 is provided with a plurality of mounting holes 112 penetrating through one side wall thickness along the length direction thereof, the mounting holes 112 are in communication with the first cavity 111, the mounting holes 112 can be threaded holes, and the sensing body 120 further comprises a top cover 125 installed in the mounting hole 112, the top cover 125 is connected with one end of the sensing element 121, the other end of the sensing element 121 is connected with the counterweight 124 and located in the first cavity 111, and the top cover 125 is further provided with a first through hole 126 penetrating through the thickness thereof, so that the first fiber grating 1221, the second fiber grating 1222, the third fiber grating group 1231 and the fourth fiber grating 1232 are connected in series as a whole by using an optical cable, and the optical cable is pulled out from the first through hole 126 to be connected with the signal conversion module in communication, each mounting hole 112 corresponds to one sensing body 120, and each sensing body 120 is provided with one fiber grating at the center of each of the four sides, two opposite fiber gratings form a group to measure the longitudinal inclination angle and the transverse inclination angle of the tunnel 20, thereby reflecting the deformation condition of the corresponding section of the tunnel 20, and the number of sensing bodies 120 can be 2, 4, 6 or more.

[0061] Through the above setting, each sensing body 120 constitutes a monitoring unit, and each monitoring unit is used for monitoring the deformation condition of the corresponding tunnel 20 section. The specific number of sensing bodies 120 is set according to the length of the tunnel 20, which ensures accurate monitoring of the deformation condition of the entire tunnel 20. It can be that all sensing bodies 120 are arranged on one sensing rod 110, or the sensing rod 110 is arranged in sections, and a certain number of sensing bodies 120 are arranged on each section of the sensing rod 110. The overall length of the sensing rod 110 needs to exceed the length of the tunnel 20, so as to realize monitoring of the deformation condition of the entire tunnel 20 through the sensing bodies 120 on the sensing rod 110. Furthermore, the multiple monitoring units are connected in series through the transmission optical cable 210 to remotely monitor the tunnel 20. When the tunnel 20 is long, the data can also be monitored in real time to obtain the deformation state of the entire tunnel 20, thereby solving the problems of long measurement work and long cycle caused by the current precision level gauge and total station in measuring a long tunnel 20.

[0062] In combination Figure 8 As shown in the figure, in order to better perceive the deformation of the tunnel 20, in a preferred embodiment, the tunnel monitoring device 10 further comprises a settlement perception plate 400, which is laid on the support layer 22, and the side of the settlement perception plate 400 away from the support layer 22 is laid with a sensing rod 110. In a specific arrangement, the settlement perception plate 400 is a horizontal plate, and the sensing body 120 connected to the sensing rod 110 is also located above the settlement perception plate 400. Through the above arrangement, when the tunnel 20 settles, the settlement perception plate 400 will move with the sensing rod 110, thereby causing the deformation of the sensitive part 121, which avoids the direct movement of the perception module 100 with the deformation of the tunnel 20, and plays a certain protective role for the perception module 100.

[0063] In order to better protect the perception module 100, specifically, the tunnel monitoring device 10 further comprises a protective cover 500, which is arranged on the side of the sensing rod 110 away from the settlement perception plate 400. In a specific arrangement, the protective cover 500 can be arranged on the sensing rod 110 and the sensing body 120 connected to the sensing rod 110. Through the above arrangement, the sensing rod 110 and the sensing body 120 can be protected from damage caused by the deformation of the tunnel 20.

[0064] In order to better ensure that the sensing rod 110 can reflect the deformation condition of the tunnel 20 in real time, more specifically, the tunnel monitoring device 10 further comprises sand soil 600, which is laid between the settlement perception plate 400 and the protective cover 500, and the sensing rod 110 is arranged in the sand soil 600. Through the above arrangement, the sand soil 600 will change with the deformation of the settlement perception plate 400, thereby causing the sensing rod 110 to change position, and then causing the deformation of the sensitive part 121, and finally reflecting the real-time deformation condition of the tunnel 20 through the first and second fiber grating groups 122 and 123.

[0065] The technical features of the above-described embodiments can be combined in any manner. For the sake of brevity, not all possible combinations of the technical features are described herein, but it should be understood that the scope of the disclosure encompasses all possible combinations of the technical features.

[0066] The above-described embodiments are merely representative of several embodiments of the present application, and the description is relatively specific and detailed, but should not be construed as limiting the scope of the patent. It should be noted that, for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the scope of the present application. Therefore, the scope of the patent of the present application should be subject to the appended claims.

Claims

1. A tunnel monitoring device for monitoring a tunnel, said tunnel comprising a tunnel opening and a support layer formed along the edge of said tunnel opening, characterized in that, It includes a sensing module, a signal conversion module, and a terminal device, wherein: The sensing module includes a sensing rod and a sensor. The sensing rod is laid on the support layer and has a first cavity inside. The sensor includes a sensitive element, a counterweight, and a first fiber grating group and a second fiber grating group disposed on the sensitive element. One end of the sensitive element is connected to the sensing rod, and the other end of the sensitive element is suspended in the first cavity. The counterweight is connected to the end of the sensitive element away from the sensing rod, so that the sensitive element deforms as the sensing rod moves. The first fiber grating group is used to collect a first strain of the sensitive element along a first direction, and the second fiber grating group is used to collect a second strain of the sensitive element along a second direction. The first direction and the second direction are perpendicular to each other in the horizontal plane. The signal conversion module is communicatively connected to the first fiber grating group and the second fiber grating group, and is used to convert the first strain of the optical signal and the second strain of the optical signal into the first strain of the electrical signal and the second strain of the electrical signal in a one-to-one correspondence. The terminal device is communicatively connected to the signal conversion module and is used to display the first strain and the second strain of the received electrical signal.

2. The tunnel monitoring device according to claim 1, characterized in that, It also includes a data processing module, which is communicatively connected to the signal conversion module, and is used to process the first strain of the electrical signal to obtain a first shape variable, and process the second strain of the electrical signal to obtain a second shape variable; The terminal device is communicatively connected to the data processing module and is used to display the received first shape and second shape.

3. The tunnel monitoring device according to claim 2, characterized in that, The first fiber grating group includes a first fiber grating and a second fiber grating. The first fiber grating and the second fiber grating are disposed on the first side and the second side of the sensing element in a one-to-one correspondence along the first direction. The first fiber grating generates a first center wavelength drift with the strain of the first side, and the second fiber grating generates a second center wavelength drift with the strain of the second side. The signal conversion module is communicatively connected to the first fiber grating and the second fiber grating, and is used to receive and process the first center wavelength drift and the second center wavelength drift signals and then transmit them to the data processing module; The data processing module is used to calculate the difference between the first center wavelength drift and the second center wavelength drift to obtain the first deformation tilt angle.

4. The tunnel monitoring device according to claim 2, characterized in that, The second fiber grating group includes a third fiber grating and a fourth fiber grating. The third fiber grating and the fourth fiber grating are disposed on the third side and the fourth side of the sensing element in a one-to-one correspondence along the second direction. The third fiber grating generates a third center wavelength drift with the strain on the third side, and the fourth fiber grating generates a fourth center wavelength drift with the strain on the fourth side. The signal conversion module is communicatively connected to the third fiber grating and the fourth fiber grating, and is used to receive the processed signals of the third center wavelength drift and the fourth center wavelength drift and transmit them to the data processing module; The data processing module is used to calculate the difference between the third center wavelength drift and the fourth center wavelength drift to obtain the second deformation tilt angle.

5. The tunnel monitoring device according to claim 1, characterized in that, The number of sensors is multiple, and the multiple sensors are distributed at intervals along the length direction of the sensing rod.

6. The tunnel monitoring device according to claim 1, characterized in that, It also includes a settlement sensing plate, which is laid on the support layer, and the sensing rod is laid on the side of the plate away from the support layer.

7. The tunnel monitoring device according to claim 6, characterized in that, It also includes a protective cover, which is placed on the side of the sensing rod away from the settlement sensing plate.

8. The tunnel monitoring device according to claim 7, characterized in that, It also includes sand, which is laid between the settlement sensing plate and the protective cover, and the sensing rod is set inside the sand.

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