A tunnel multi-section surface deformation measurement system

Abstract

The utility model provides a kind of tunnel multi-section surface deformation measurement system, multiple tunnel multi-section surface deformation measurement units are arranged along tunnel axial direction;Each tunnel multi-section surface deformation measurement unit includes machine vision camera, infrared fill light, electrical box and passive reflective target arranged in each tunnel monitoring section.It has the advantages: using non-contact tunnel structure deformation measurement method, can reduce wiring, reduce operation, improve construction efficiency;Machine vision camera and infrared fill light are installed on the surface of tunnel lining by wall-mounted support, with the advantage of easy installation, and the pitch angle of machine vision camera and infrared fill light can be flexibly adjusted, to improve the acquisition range of machine vision camera and the light efficiency of infrared fill light;Using passive infrared reflective target as the indirect carrier of tunnel multi-section structure surface deformation measurement, greatly reduces the workload and cost of field implementation, improves the convenience of system equipment and accessory field construction installation.

Description

Technical Field

[0001] This utility model belongs to the field of tunnel engineering construction technology, specifically relating to a tunnel multi-section surface deformation measurement system. Background Technology

[0002] Deformation monitoring of the tunnel cross-section is necessary both during tunnel construction and operation. Specifically, during construction, the deformation of the surrounding rock and support structure needs to be monitored to understand their development trends, assess rock stability, and provide a basis for tunnel construction. During operation, sections with poor geological conditions may experience tunnel structural deformation or lining cracking due to surrounding rock stress, affecting vehicle safety. Therefore, tunnel cross-section deformation monitoring allows for timely detection of tunnel anomalies and early warnings to reduce accidents.

[0003] Currently, the main method for monitoring and measuring tunnels under construction is to manually measure targets installed on the inner wall of the tunnel using a total station. The main method for monitoring cross-sectional deformation of operating tunnels is to collect data by installing various contact sensors such as strain gauges and displacement gauges. The above methods for monitoring and measuring tunnels have the following shortcomings: (1) Using a total station is cumbersome and the measurement process can easily affect tunnel construction; (2) Using contact sensors requires a large number of contact sensors to be installed on the tunnel cross-section, which requires a lot of wiring, resulting in a high workload and the wiring is prone to aging or damage from external factors, leading to system failure. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a multi-section surface deformation measurement system for tunnels, which can effectively solve the aforementioned problems.

[0005] The technical solution adopted in this utility model is as follows:

[0006] This utility model provides a tunnel multi-section surface deformation measurement system, which arranges multiple tunnel multi-section surface deformation measurement units sequentially along the tunnel axis; each of the tunnel multi-section surface deformation measurement units includes a machine vision camera (1), an infrared supplementary light (2), an electrical box (4), and passive reflective targets (3) arranged on each tunnel monitoring section;

[0007] The electrical box (4) contains a router and a power supply battery; the infrared fill light (2) is connected to the power supply battery via a fill light power supply line (5); the machine vision camera (1) is connected to the power supply battery via a camera power supply line (6); the machine vision camera (1) is connected to the router via a camera communication line (7);

[0008] The electrical box (4) of each of the tunnel multi-section surface deformation measurement units is connected to the electrical box (4) of the next adjacent tunnel multi-section surface deformation measurement unit via an electrical box communication line (8).

[0009] Preferably, at each tunnel monitoring section, one of the passive reflective targets (3) is installed at its crown, left shoulder, left waist, right shoulder and right waist.

[0010] Preferably, the passive reflective target (3) is installed at the corresponding position of the tunnel monitoring section via a passive target base plate (9).

[0011] Preferably, the machine vision camera (1) and the infrared fill light (2) are mounted on the tunnel lining via a wall-mounted bracket (10).

[0012] Preferably, the wall-mounted bracket (10) includes a mounting base (10.1), a horizontal support frame (10.2), an L-shaped hanging bracket (10.3), a camera duckbill bracket (10.4), and an adjustable angle bracket for the fill light (10.5);

[0013] The mounting base (10.1) has mounting holes at its four corners, through which the mounting base (10.1) is fixed to the tunnel lining; the horizontal support frame (10.2) is fixedly installed in the middle of the mounting base (10.1); the camera duckbill bracket (10.4) is installed on the top surface of the horizontal support frame (10.2), and the machine vision camera (1) is installed on the top surface of the camera duckbill bracket (10.4); the L-shaped suspension bracket (10.3) is bolted to the side of the horizontal support frame (10.2), and the adjustable angle bracket for the supplementary light (10.5) is installed on the top of the L-shaped suspension bracket (10.3); the infrared supplementary light (2) is installed inside the adjustable angle bracket for the supplementary light (10.5).

[0014] Preferably, the camera duckbill bracket (10.4) includes a bracket fixing seat (10.4.1), a bracket movable seat (10.4.2), a rotating shaft (10.4.3), a nut (10.4.4), a lead screw (10.4.5), a swing arm (10.4.6), a force transmission rod (10.4.7), a fixing plate (10.4.8), and a spring (10.4.9);

[0015] The bracket fixing seat (10.4.1) is fixed to the horizontal support frame (10.2); the bracket fixing seat (10.4.1) is rotatably connected to the bracket movable seat (10.4.2) through the rotating shaft (10.4.3), so that the bracket movable seat (10.4.2) can rotate relative to the bracket fixing seat (10.4.1);

[0016] The fixing plate (10.4.8) is fixedly installed on the upper side of the movable seat of the bracket (10.4.2); the spring (10.4.9) is installed vertically between the fixing plate (10.4.8) and the bottom surface of the fixing seat of the bracket (10.4.1);

[0017] The swing arm (10.4.6) is L-shaped, with its center fitted around the outside of the pivot (10.4.3); the swing arm (10.4.6) includes an integrally formed vertical rod and a horizontal rod;

[0018] The nut (10.4.4) is fixed to the lower side of the bracket fixing seat (10.4.1); the lead screw (10.4.5) is horizontally arranged, its thread passes through the nut (10.4.4), and the end of the lead screw (10.4.5) abuts against the outside of the rotatable ball embedded in the bottom of the vertical rod, for applying a thrust to the bottom of the vertical rod;

[0019] The force transmission rod (10.4.7) is vertically arranged, with its top fixed to the fixing plate (10.4.8) and its bottom abutting against the outside of the rotatable sphere embedded in the end of the horizontal rod.

[0020] Preferably, the lead screw (10.4.5) is equipped with a handwheel (10.4.10).

[0021] Preferably, the adjustable angle bracket (10.5) for the supplementary light includes a rotating base (10.5.1), which is rotatably connected to the base of the L-shaped suspension bracket (10.3); a first clamping arm (10.5.2) and a second clamping arm (10.5.3) are symmetrically arranged on the front and rear sides of the rotating base (10.5.1); the infrared supplementary light (2) is located on the first clamping arm (10.5.2) and the second clamping arm (10.5.3). Between .5.3); the upper part of the first clamping arm (10.5.2) and the second clamping arm (10.5.3) are provided with an arc-shaped groove (10.5.4) and a mounting through hole (10.5.5) located at the upper part of the arc-shaped groove (10.5.4); the arc-shaped groove (10.5.4) is slidably connected to the protrusion on the side of the infrared fill light (2); the mounting through hole (10.5.5) is used to pass through the bolt and fasten it to the infrared fill light (2).

[0022] The tunnel multi-section surface deformation measurement system provided by this utility model has the following advantages:

[0023] (1) Using a non-contact tunnel structure deformation measurement method can reduce wiring, simplify operations, and improve construction efficiency;

[0024] (2) The machine vision camera and infrared supplement light are installed on the tunnel lining surface by wall-mounted brackets, which has the advantage of convenient installation. In addition, the pitch angle of the machine vision camera and infrared supplement light can be flexibly adjusted to improve the acquisition range of the machine vision camera and the supplementary lighting efficiency of the infrared supplement light, so as to meet the monitoring needs of multiple tunnel sections.

[0025] (3) Using passive infrared reflective targets as indirect carriers for measuring surface deformation of multi-section tunnel structures, there is no need to lay power supply cables for the targets on site, which greatly reduces the workload and cost of on-site implementation and improves the convenience of on-site construction and installation of system equipment and accessories. Attached Figure Description

[0026] Figure 1 A structural diagram of a tunnel multi-section surface deformation measurement system provided by this utility model;

[0027] Figure 2 A schematic diagram of the layout principle of a tunnel multi-section surface deformation measurement system provided by this utility model;

[0028] Figure 3 This is a schematic diagram of the deployment of a single-section target provided by this utility model;

[0029] Figure 4 Structural diagram of the passive target base plate provided by this utility model;

[0030] Figure 5 A diagram illustrating the usage of the wall-mounted bracket provided by this utility model;

[0031] Figure 6 The overall structural diagram of the wall-mounted bracket provided by this utility model;

[0032] Figure 7 Assembly drawing of the mounting base, horizontal support frame and L-shaped suspension frame provided for this utility model;

[0033] Figure 8 The structural diagram of the camera duckbill bracket provided by this utility model. Detailed Implementation

[0034] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0035] This utility model provides a multi-section surface deformation measurement system for tunnels, applied to non-contact tunnel structural deformation measurement. It achieves multi-section structural deformation monitoring of tunnels by identifying the displacement of a passive reflective target. It can be applied to surface deformation monitoring of tunnels under construction or in operation. (See reference...) Figure 1 and Figure 2 Multiple tunnel multi-section surface deformation measurement units are arranged sequentially along the tunnel axis; each of the tunnel multi-section surface deformation measurement units includes a machine vision camera 1, an infrared supplementary light 2, an electrical box 4, and passive reflective targets 3 arranged on each tunnel monitoring section;

[0036] The electrical box 4 contains a router and a power supply battery; the infrared fill light 2 is connected to the power supply battery via a fill light power supply cable 5; the machine vision camera 1 is connected to the power supply battery via a camera power supply cable 6; and the machine vision camera 1 is connected to the router via a camera communication cable 7.

[0037] The electrical box 4 of each of the tunnel multi-section surface deformation measurement units is connected to the electrical box 4 of the next adjacent tunnel multi-section surface deformation measurement unit via the electrical box communication line 8.

[0038] The arrangement of the passive reflective target 3 is as follows: (See attached diagram) Figure 3 At each tunnel monitoring section, one passive reflective target 3 is installed at its arch crown, left arch shoulder, left arch waist, right arch shoulder, and right arch waist. The passive reflective target 3 is specifically implemented through… Figure 4 The passive target base plate 9 shown is installed at the corresponding position on the tunnel monitoring section.

[0039] like Figure 5 As shown, the machine vision camera 1 and the infrared supplementary light 2 are mounted on the tunnel lining via a wall-mounted bracket 10. The wall-mounted bracket 10 facilitates the installation and deployment of the machine vision camera 1 and the infrared supplementary light 2. Figure 6 As shown, the wall-mounted bracket 10 includes a mounting base 10.1, a horizontal support frame 10.2, an L-shaped hanging bracket 10.3, a camera duckbill bracket 10.4, and an adjustable angle bracket for the fill light 10.5;

[0040] See Figure 7 The mounting base 10.1 has mounting holes at its four corners, through which the mounting base 10.1 is fixed to the tunnel lining; the horizontal support frame 10.2 is fixedly installed in the middle of the mounting base 10.1; the camera duckbill bracket 10.4 is installed on the top surface of the horizontal support frame 10.2, and the machine vision camera 1 is installed on the top surface of the camera duckbill bracket 10.4; the L-shaped suspension bracket 10.3 is bolted to the side of the horizontal support frame 10.2, and the adjustable angle bracket 10.5 for the supplementary light is installed on the top of the L-shaped suspension bracket 10.3; the infrared supplementary light 2 is installed inside the adjustable angle bracket 10.5 for the supplementary light.

[0041] See Figure 8The camera duckbill bracket 10.4 includes a bracket fixing base 10.4.1, a bracket movable base 10.4.2, a rotating shaft 10.4.3, a nut 10.4.4, a lead screw 10.4.5, a swing arm 10.4.6, a force transmission rod 10.4.7, a fixing plate 10.4.8, and a spring 10.4.9;

[0042] The bracket fixing seat 10.4.1 is fixed to the horizontal support frame 10.2; the bracket fixing seat 10.4.1 is rotatably connected to the bracket movable seat 10.4.2 through the rotating shaft 10.4.3, so that the bracket movable seat 10.4.2 can rotate relative to the bracket fixing seat 10.4.1;

[0043] The fixing plate 10.4.8 is fixedly installed on the upper side of the movable seat 10.4.2 of the bracket; the spring 10.4.9 is installed vertically between the fixing plate 10.4.8 and the bottom surface of the fixing seat 10.4.1 of the bracket;

[0044] The swing arm 10.4.6 is L-shaped, with its center fitted around the outside of the rotating shaft 10.4.3; the swing arm 10.4.6 includes an integrally formed vertical rod and a horizontal rod;

[0045] The nut 10.4.4 is fixed to the lower side of the bracket fixing seat 10.4.1; the lead screw 10.4.5 is horizontally arranged, its thread passes through the nut 10.4.4, and the end of the lead screw 10.4.5 abuts against the outside of the rotatable ball embedded in the bottom of the vertical rod, for applying a thrust to the bottom of the vertical rod; the lead screw 10.4.5 is equipped with a handwheel 10.4.10.

[0046] The force transmission rod 10.4.7 is vertically arranged, with its top fixed to the fixing plate 10.4.8 and its bottom abutting against the outside of the rotatable sphere embedded in the end of the horizontal rod.

[0047] The camera duckbill bracket 10.4 is used to sensitively adjust the pitch angle of the machine vision camera 1. Its operating principle is as follows:

[0048] Assumption Figure 8In the initial state; when it is necessary to adjust the pitch angle of the machine vision camera 1, rotate the lead screw 10.4.5, which moves to the right and acts on the end of the vertical rod of the swing arm 10.4.6, thereby pushing the swing arm 10.4.6 to rotate counterclockwise around the axis 10.4.3; when the swing arm 10.4.6 rotates counterclockwise around the axis 10.4.3, it applies force to the fixed plate 10.4.8 through the force transmission rod 10.4.7, thereby causing the fixed plate 10.4.8 to overcome the tension of the spring 10.4.9 and drive the movable support seat 10.4.2 to rotate counterclockwise around the axis 10.4.3, thus realizing the adjustment of the pitch angle of the movable support seat 10.4.2; when the adjustment is in place, due to the action of the nut 10.4.4 on the lead screw 10.4.5, the movable support seat 10.4.2 can be kept at the adjusted angle.

[0049] When the pitch angle of the movable support 10.4.2 needs to be adjusted in the opposite direction, the lead screw 10.4.5 rotates in the opposite direction by a certain angle, so that under the tension of the spring 10.4.9, the movable support 10.4.2 rotates clockwise around the pivot 10.4.3.

[0050] The camera duckbill bracket 10.4 provided in this application, through the above-mentioned screw nut and spring structure, can achieve stable pitch angle and fine adjustment.

[0051] See Figure 6 The adjustable angle bracket 10.5 for the supplementary light includes a rotating seat 10.5.1, which is rotatably connected to the base of the L-shaped suspension bracket 10.3. The rotating seat 10.5.1 rotates relative to the L-shaped suspension bracket 10.3 to the required angle and is fastened with bolts to adjust the orientation of the infrared supplementary light 2 so that the infrared supplementary light 2 is in the same orientation as the machine vision camera 1. The rotating base 10.5.1 is symmetrically provided with a first clamping arm 10.5.2 and a second clamping arm 10.5.3 on its front and rear sides; the infrared supplementary light 2 is located between the first clamping arm 10.5.2 and the second clamping arm 10.5.3; the upper part of the first clamping arm 10.5.2 and the second clamping arm 10.5.3 are both provided with an arc-shaped groove 10.5.4 and a mounting through hole 10.5.5 located directly above the arc-shaped groove 10.5.4; the arc-shaped groove 10.5.4 is slidably connected to the protrusion on the side of the infrared supplementary light 2; the mounting through hole 10.5.5 is used to pass a bolt and fasten it to the infrared supplementary light 2. Its usage is as follows: the protrusions on both sides of the infrared fill light 2 slide along their respective arc-shaped grooves 10.5.4 to adjust the pitch angle of the infrared fill light 2. After adjustment, a bolt is passed through the mounting through hole 10.5.5 and screwed into the infrared fill light 2 to achieve a tight fit. By setting the arc-shaped grooves, a stable adjustment of the pitch angle can be achieved.

[0052] The following is an example:

[0053] Machine vision camera 1 is the core device of this system. It is fixedly installed on the surface of the tunnel lining. The camera lens observes along the tunnel axis. In this solution, one machine vision camera is the master, and the other machine vision cameras are slaves. The master and slaves are connected to a local area network through a communication link. Each machine vision camera has a unique device identification code and network address.

[0054] Infrared supplement light 2 is installed next to machine vision camera 1 and is aligned with the observation direction of machine vision camera 1. The supplement light direction is aimed at passive reflective target 3.

[0055] Passive reflective target 3, with its reflective surface facing the machine vision camera 1, passes through... Figure 4 The passive target base plate 9 shown is fixed on the tunnel lining surface. A single monitoring section is usually equipped with 5 passive reflective targets 3: 1 for the arch top, 1 for each of the left and right arch shoulders, and 1 for each of the left and right arch waists. A single machine vision camera 1 can simultaneously measure multiple sections within its effective measurement range.

[0056] Electrical box 4 supplies power to infrared fill light 2 via fill light power supply line 5, supplies power to machine vision camera via camera power supply line 6, and interconnects with machine vision camera 1 via camera communication line 7. Camera data is exchanged and interconnected through the internal exchange of the electrical box. It is connected to other electrical boxes via electrical box communication line 8. Electrical box 4 integrates a router, and data from various devices in the local area network can be exchanged with the Internet through the router.

[0057] Wall-mounted brackets 10 are installed at certain intervals along the tunnel axis on the tunnel lining. The wall-mounted brackets 10 facilitate the installation of the machine vision camera 1 and the infrared supplementary light 2.

[0058] The machine vision camera 1 is mounted via a camera duckbill bracket 10.4; the infrared fill light 2 is mounted via an adjustable fill light bracket 10.5. In this application, the camera duckbill bracket 10.4 facilitates adjustment of the pitch angle of the machine vision camera 1; similarly, the adjustable fill light bracket 10.5 facilitates adjustment of the pitch angle of the infrared fill light 2, thereby ensuring that the infrared fill light 2 and the machine vision camera 1 are aligned in the measurement direction, thus improving the fill light effect.

[0059] One usage method is as follows: The machine vision camera 1 is connected to the electrical box 4 via a communication interface. Different electrical boxes 4 are also interconnected via communication interfaces. The network communication module inside the electrical box 4 is interconnected with the supplementary light switch control module. The machine vision camera 1 can control the power supply switch of the supplementary light to control the on / off state of the supplementary light via commands. Each machine vision camera 1 starts data acquisition and controls the switch component inside the electrical box 4 to turn on the infrared supplementary light 2 through the camera communication line. According to the configured data acquisition volume, multiple frames of images are continuously acquired and the displacement of each target within the field of view is identified. After the data acquisition is completed, the infrared supplementary light 2 is turned off, and the displacement data of each target is reported to the management server, waiting for the next sampling cycle.

[0060] The tunnel multi-section surface deformation measurement system provided by this utility model has the following advantages:

[0061] (1) Using a non-contact tunnel structure deformation measurement method can reduce wiring, simplify operations, and improve construction efficiency;

[0062] (2) The machine vision camera and infrared supplement light are installed on the tunnel lining surface by wall-mounted brackets, which has the advantage of convenient installation. In addition, the pitch angle of the machine vision camera and infrared supplement light can be flexibly adjusted to improve the acquisition range of the machine vision camera and the supplementary lighting efficiency of the infrared supplement light, so as to meet the monitoring needs of multiple tunnel sections.

[0063] (3) Using passive infrared reflective targets as indirect carriers for measuring surface deformation of multi-section tunnel structures, there is no need to lay power supply cables for the targets on site, which greatly reduces the workload and cost of on-site implementation and improves the convenience of on-site construction and installation of system equipment and accessories.

[0064] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A multi-section surface deformation measurement system for tunnels, characterized in that, Multiple tunnel multi-section surface deformation measurement units are arranged sequentially along the tunnel axis; each of the tunnel multi-section surface deformation measurement units includes a machine vision camera (1), an infrared supplementary light (2), an electrical box (4), and passive reflective targets (3) arranged on each tunnel monitoring section. The electrical box (4) contains a router and a power supply battery; the infrared fill light (2) is connected to the power supply battery via a fill light power supply line (5); The machine vision camera (1) is connected to the power supply battery via a camera power supply cable (6); The machine vision camera (1) is connected to the router via a camera communication cable (7); The electrical box (4) of each of the tunnel multi-section surface deformation measurement units is connected to the electrical box (4) of the next adjacent tunnel multi-section surface deformation measurement unit via an electrical box communication line (8). The machine vision camera (1) and the infrared fill light (2) are mounted on the tunnel lining via a wall-mounted bracket (10); The wall-mounted bracket (10) includes a mounting base (10.1), a horizontal support frame (10.2), an L-shaped hanging bracket (10.3), a camera duckbill bracket (10.4), and an adjustable angle bracket for the fill light (10.5). The mounting base (10.1) has mounting holes at its four corners, through which the mounting base (10.1) is fixed to the tunnel lining; the horizontal support frame (10.2) is fixedly installed in the middle of the mounting base (10.1); the camera duckbill bracket (10.4) is installed on the top surface of the horizontal support frame (10.2), and the machine vision camera (1) is installed on the top surface of the camera duckbill bracket (10.4); the L-shaped suspension bracket (10.3) is bolted to the side of the horizontal support frame (10.2), and the adjustable angle bracket for the supplementary light (10.5) is installed on the top of the L-shaped suspension bracket (10.3); the infrared supplementary light (2) is installed inside the adjustable angle bracket for the supplementary light (10.5). The camera duckbill bracket (10.4) includes a bracket fixing seat (10.4.1), a bracket movable seat (10.4.2), a rotating shaft (10.4.3), a nut (10.4.4), a lead screw (10.4.5), a swing arm (10.4.6), a force transmission rod (10.4.7), a fixing plate (10.4.8), and a spring (10.4.9). The bracket fixing seat (10.4.1) is fixed to the horizontal support frame (10.2); the bracket fixing seat (10.4.1) is rotatably connected to the bracket movable seat (10.4.2) through the rotating shaft (10.4.3), so that the bracket movable seat (10.4.2) can rotate relative to the bracket fixing seat (10.4.1); The fixing plate (10.4.8) is fixedly installed on the upper side of the movable seat of the bracket (10.4.2); the spring (10.4.9) is installed vertically between the fixing plate (10.4.8) and the bottom surface of the fixing seat of the bracket (10.4.1). The swing arm (10.4.6) is L-shaped, with its center fitted around the outside of the pivot (10.4.3); the swing arm (10.4.6) includes an integrally formed vertical rod and a horizontal rod; The nut (10.4.4) is fixed to the lower side of the bracket fixing seat (10.4.1); the lead screw (10.4.5) is horizontally arranged, and its thread passes through the nut ( 10.4.4), the end of the lead screw (10.4.5) abuts against the outside of the rotatable ball embedded in the bottom of the vertical rod, for applying a thrust to the bottom of the vertical rod; The force transmission rod (10.4.7) is vertically arranged, with its top fixed to the fixing plate (10.4.8) and its bottom abutting against the outside of the rotatable sphere embedded in the end of the horizontal rod; The adjustable angle bracket (10.5) for the supplementary light includes a rotating base (10.5.1), which is rotatably connected to the base of the L-shaped suspension bracket (10.3). A first clamping arm (10.5.2) and a second clamping arm (10.5.3) are symmetrically arranged on the front and rear sides of the rotating base (10.5.1). The infrared supplementary light (2) is located on the first clamping arm (10.5.2) and the second clamping arm (10.5.3). Between .3); the upper part of the first clamping arm (10.5.2) and the second clamping arm (10.5.3) are provided with an arc-shaped groove (10.5.4) and a mounting through hole (10.5.5) located at the upper part of the arc-shaped groove (10.5.4); the arc-shaped groove (10.5.4) is slidably connected to the protrusion on the side of the infrared fill light (2); the mounting through hole (10.5.5) is used to pass through the bolt and fasten it to the infrared fill light (2).

2. The tunnel multi-section surface deformation measurement system according to claim 1, characterized in that, At each tunnel monitoring section, a passive reflective target (3) is installed at its crown, left shoulder, left waist, right shoulder and right waist.

3. The tunnel multi-section surface deformation measurement system according to claim 1, characterized in that, The passive reflective target (3) is installed at the corresponding position of the tunnel monitoring section via the passive target base plate (9).

4. The tunnel multi-section surface deformation measurement system according to claim 1, characterized in that, The lead screw (10.4.5) is equipped with a handwheel (10.4.10).

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