Shield construction data monitoring method and equipment

Abstract

The invention discloses a shield construction data monitoring method and device. The method comprises the steps that the distance between a target exposed surrounding rock and a shield body of the same section is detected through a plurality of distance sensors and serves as the back break distance; after the target bare surrounding rock extends out of the shield body, performing section contour scanning on the target bare surrounding rock to obtain section contour data; drawing an over-break and under-break distribution diagram according to the section contour data, and correcting the over-break and under-break distribution diagram according to the over-break and under-break distance. According to the method, section scanning data are corrected through shield body distance measurement monitoring, and over-excavation underestimation and under-excavation overestimation caused by tunnel surrounding rock convergence are effectively reduced, so that the monitoring result is more accurate, and effective data support is provided for construction decision making and shield control.

Description

Technical Field

[0001] This invention relates to intelligent monitoring technology, specifically to a method and equipment for monitoring tunnel boring machine (TBM) construction data. Background Technology

[0002] Over-excavation in shield tunnels reduces the self-stabilizing thickness of the tunnel face, making it prone to collapse and mudslides. It also increases the amount of slag removed, slows down the construction period, causes insufficient backfilling behind the initial support, deepens the surface settlement trough, and may even lead to sudden collapse. Additional concrete backfilling and multiple backfillings are required, increasing material and maintenance costs. Furthermore, the increased thickness of the lining, temperature shrinkage cracks, and loose waterproofing membrane reduce durability. Meanwhile, under-excavation forces secondary chiseling, interrupts the tunneling cycle, disturbs the surrounding rock, and causes insufficient gaps in the steel frame or segment assembly, a sudden increase in the insertion force of the capping block, edge and corner cracking, and bolt breakage, seriously affecting construction safety.

[0003] In the prior art, Chinese patent application number CN201710316233.6 discloses a method for measuring the excavation of irregular tunnels. This invention uses a 3D laser scanner positioned behind the tail and cutterhead of a tunnel boring machine (TBM) within the irregular tunnel to perform a full-angle scan, obtaining point cloud images of the inner surface of the irregular tunnel and the outer shell of the TBM. Based on these point cloud images, a model of the inner surface of the irregular tunnel and a model of the front and rear contours of the TBM are obtained through tunnel section extraction and TBM outline extraction. The central axis of the irregular tunnel is determined based on these models, and the attitude data of the TBM and the coordinate data of the central axis of the irregular tunnel are calculated based on the central axis and reference points. This overcomes the limitation of traditional measurement techniques, which are only applicable to circular tunnels. However, existing monitoring techniques require the surrounding rock to be exposed to the shield body before scanning the surrounding rock section. By this time, the surrounding rock has been exposed for a long time and has converged, resulting in significant errors in the monitoring results. Summary of the Invention

[0004] In order to at least overcome the above-mentioned shortcomings in the prior art, the purpose of this application is to provide a method and equipment for monitoring shield tunneling construction data.

[0005] In a first aspect, embodiments of this application provide a method for monitoring shield tunneling construction data, including: The over- or under-excavation distance is determined by detecting the distance between the target exposed surrounding rock and the shield body at the same cross-section using multiple distance sensors; the distance sensors are arranged circumferentially on the shield body, and the detection direction is radially towards the target exposed surrounding rock along the shield body. After the target exposed surrounding rock extends out of the shield, the cross-sectional contour scan of the target exposed surrounding rock is performed to obtain cross-sectional contour data; A distribution map of over-excavation and under-excavation is drawn based on the cross-sectional contour data, and the distribution map of over-excavation and under-excavation is corrected based on the over-excavation and under-excavation distance.

[0006] In one possible implementation, drawing an over-excavation / under-excavation distribution map based on the cross-sectional profile data includes: In the preset polar coordinate system, a circular area is constructed with the center point of the shield body as the center and the diameter of the shield cutterhead as the diameter as the standard area. The shield center point corresponding to the cross-sectional contour data is obtained as the contour center point, and the cross-sectional contour data is set in the polar coordinate system to form the over-excavation and under-excavation distribution map; in the polar coordinate system, the contour center point and the circle center coincide.

[0007] In one possible implementation, correcting the over- and under-excavation distribution map based on the over- and under-excavation distance includes: The over- or under-excavation distances are configured in the polar coordinate system, and the distance to the center of the measuring circle corresponding to each over- or under-excavation distance is calculated based on the over- or under-excavation distances; the distance to the center of the measuring circle is the distance from the point corresponding to the over- or under-excavation distance to the center point of the shield body; Obtain the center distance of the profile contour data at each location corresponding to the over-excavation and under-excavation distance, and calculate the ratio of the center distance of the measuring circle to the profile contour data as the convergence ratio at the corresponding location. Interpolate all the aforementioned convergence ratios based on the circumferential distance to form the interpolated convergence ratio corresponding to each cross-sectional contour data point; The cross-sectional profile data is corrected according to the interpolation convergence ratio.

[0008] In one possible implementation, correcting the cross-sectional profile data according to the interpolation convergence ratio includes: The product of the interpolation convergence ratio and the distance between the center circles of the cross-sectional contour data at the corresponding position is calculated as the corrected contour data. The corrected contour data is set in the polar coordinate system and curve fitting is performed to form the corrected over-excavation and under-excavation distribution map.

[0009] In one possible implementation, configuring the over-dumping and under-dumping distance in the polar coordinate system includes: Obtain the polar coordinates of each distance sensor relative to the center point of the shield body, and configure each distance sensor in the polar coordinate system according to the polar coordinates; The over- and under-dig distance is configured in the polar coordinate system by extending the distance sensor position corresponding to the over- and under-dig distance in the polar coordinate system.

[0010] In one possible implementation, the calculation of the distance between the center of the ranging circle includes: Obtain the polar coordinates of each over- or under-dig distance extended at the distance sensor, and calculate the distance to the center of the ranging circle based on the polar coordinates.

[0011] Secondly, embodiments of this application also provide a shield tunneling construction data monitoring device, comprising: The distance monitoring module is configured to detect the distance between the target exposed surrounding rock and the shield body at the same cross section using multiple distance sensors as the over- or under-excavation distance; the distance sensors are arranged circumferentially on the shield body, and the detection direction is radially towards the target exposed surrounding rock along the shield body; The cross-section monitoring module is configured to perform cross-section contour scanning on the target exposed surrounding rock after it extends out of the shield body to obtain cross-section contour data. The analysis module is configured to draw an over-excavation and under-excavation distribution map based on the cross-sectional contour data, and to correct the over-excavation and under-excavation distribution map based on the over-excavation and under-excavation distance.

[0012] In one possible implementation, the analysis module is further configured as follows: In the preset polar coordinate system, a circular area is constructed with the center point of the shield body as the center and the diameter of the shield cutterhead as the diameter as the standard area. The shield center point corresponding to the cross-sectional contour data is obtained as the contour center point, and the cross-sectional contour data is set in the polar coordinate system to form the over-excavation and under-excavation distribution map; in the polar coordinate system, the contour center point and the circle center coincide.

[0013] In one possible implementation, the analysis module is further configured as follows: The over- or under-excavation distances are configured in the polar coordinate system, and the distance to the center of the measuring circle corresponding to each over- or under-excavation distance is calculated based on the over- or under-excavation distances; the distance to the center of the measuring circle is the distance from the point corresponding to the over- or under-excavation distance to the center point of the shield body; Obtain the center distance of the profile contour data at each location corresponding to the over-excavation and under-excavation distance, and calculate the ratio of the center distance of the measuring circle to the profile contour data as the convergence ratio at the corresponding location. Interpolate all the aforementioned convergence ratios based on the circumferential distance to form the interpolated convergence ratio corresponding to each cross-sectional contour data point; The cross-sectional profile data is corrected according to the interpolation convergence ratio.

[0014] In one possible implementation, the analysis module is further configured as follows: The product of the interpolation convergence ratio and the distance between the center circles of the cross-sectional contour data at the corresponding position is calculated as the corrected contour data. The corrected contour data is set in the polar coordinate system and curve fitting is performed to form the corrected over-excavation and under-excavation distribution map.

[0015] Compared with the prior art, the present invention has the following advantages and beneficial effects: This invention discloses a method and equipment for monitoring shield tunneling construction data. By using shield body distance measurement monitoring to correct cross-section scanning data, it effectively reduces the underestimation of over-excavation and overestimation of under-excavation caused by tunnel surrounding rock convergence, thereby making the monitoring results more accurate and providing effective data support for construction decision-making and shield control. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the method steps in an embodiment of this application; Figure 2 This is a distribution diagram of over-excavation and under-excavation in an embodiment of this application. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the accompanying drawings in this application are for illustrative and descriptive purposes only and are not intended to limit the scope of protection of this application. Furthermore, it should be understood that the schematic drawings are not drawn to scale. The flowcharts used in this application illustrate operations implemented according to some embodiments of this application. It should be understood that the operations in the flowcharts may not be implemented in sequence, and steps without logical contextual relationships may be reversed or implemented simultaneously. In addition, those skilled in the art, guided by the content of this application, may add one or more other operations to the flowcharts, or remove one or more operations from the flowcharts.

[0018] Furthermore, the described embodiments are merely some, not all, of the embodiments of this application. The components of the embodiments of this application described and illustrated herein can typically be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0019] Please refer to the following: Figure 1 This is a flowchart illustrating a shield tunneling construction data monitoring method provided in an embodiment of the present invention. Further, the shield tunneling construction data monitoring method may specifically include the contents described in steps S1-S3.

[0020] S1: The over- or under-excavation distance is determined by detecting the distance between the target exposed surrounding rock and the shield body at the same cross-section using multiple distance sensors; the distance sensors are arranged circumferentially on the shield body, and the detection direction is radially towards the target exposed surrounding rock along the shield body. S2: After the target exposed surrounding rock extends out of the shield body, the cross-sectional contour scan of the target exposed surrounding rock is performed to obtain cross-sectional contour data; S3: Draw an over-excavation and under-excavation distribution map based on the cross-sectional contour data, and correct the over-excavation and under-excavation distribution map based on the over-excavation and under-excavation distance.

[0021] In the implementation of this application embodiment, a ring of distance sensors needs to be arranged around the shield body. For example, for a 6m diameter tunnel boring machine, 16 laser rangefinders are arranged on the outer shell of the shield body at a distance of 0.5 from the cutterhead. They are installed in mounting holes machined inside the shield body steel plate, with the detection window flush with the outer surface of the shield body. At the same time, the laser emission direction of all laser rangefinders is radially pointing towards the tunnel wall along the shield body. The central angle between adjacent sensors is 22.5°. These sensors transmit the ranging data to the host computer in real time through the field CAN bus.

[0022] In this embodiment, the distance sensor, being mounted on the shield, can detect the state of the exposed surrounding rock cut by the cutterhead earlier. However, due to the limited number of distance sensors, their locations are relatively discrete, making it difficult to provide complete information on over-excavation and under-excavation. Therefore, in this embodiment, a two-dimensional laser scanner is also deployed at the shield tail to scan the exposed surrounding rock outside the shield tail. It should be understood that in subsequent processing, the exposed surrounding rock sections corresponding to the two-dimensional laser scanner and the laser distance sensor need to be consistent. This can be achieved by calibrating the mileage of the target exposed surrounding rock section, which is not limited in this embodiment. For example, the two-dimensional laser scanner is configured on the outside of the shield tail, ensuring that the two-dimensional laser scanner can immediately scan the surrounding rock section just exposed by the shield after the shield tail has completely passed through the target exposed surrounding rock area.

[0023] In this embodiment of the application, the cross-sectional profile obtained by scanning with a two-dimensional laser scanner is an extremely accurate cross-sectional profile, but it is a cross-sectional profile generated after convergence. At this time, the cross-sectional profile can be presented in a coordinate system to form an over-excavation and under-excavation distribution map, and the over-excavation and under-excavation distribution map can be corrected by the distance data generated by the distance sensor to form an accurate over-excavation and under-excavation distribution map.

[0024] In one possible implementation, drawing an over-excavation / under-excavation distribution map based on the cross-sectional profile data includes: In the preset polar coordinate system, a circular area is constructed with the center point of the shield body as the center and the diameter of the shield cutterhead as the diameter as the standard area. The shield center point corresponding to the cross-sectional contour data is obtained as the contour center point, and the cross-sectional contour data is set in the polar coordinate system to form the over-excavation and under-excavation distribution map; in the polar coordinate system, the contour center point and the circle center coincide.

[0025] In the implementation of this application embodiment, all data needs to be represented in the same coordinate system. Since shield tunnels generally adopt a circular structure, a polar coordinate system is used for representation. In this polar coordinate system, the standard outline of the shield tunnel needs to be drawn first, so the diameter of the shield cutterhead is selected as the diameter to construct the standard area. The cross-sectional outline data is relative to the data of the two-dimensional laser scanner, so these cross-sectional outline data can be converted to this polar coordinate system according to the specific position of the two-dimensional laser scanner. Specifically, the cross-sectional outline data is converted to the polar coordinate system by calculating the positional relationship between the two-dimensional laser scanner and the center point of the outline; at this time, these cross-sectional outline data can form a basic over-excavation and under-excavation distribution map.

[0026] In one possible implementation, correcting the over- and under-excavation distribution map based on the over- and under-excavation distance includes: The over- or under-excavation distances are configured in the polar coordinate system, and the distance to the center of the measuring circle corresponding to each over- or under-excavation distance is calculated based on the over- or under-excavation distances; the distance to the center of the measuring circle is the distance from the point corresponding to the over- or under-excavation distance to the center point of the shield body; Obtain the center distance of the profile contour data at each location corresponding to the over-excavation and under-excavation distance, and calculate the ratio of the center distance of the measuring circle to the profile contour data as the convergence ratio at the corresponding location. Interpolate all the aforementioned convergence ratios based on the circumferential distance to form the interpolated convergence ratio corresponding to each cross-sectional contour data point; The cross-sectional profile data is corrected according to the interpolation convergence ratio.

[0027] In the implementation of this application embodiment, since the over-excavation and under-excavation distance characterizes the over-excavation and under-excavation state relatively accurately, but is relatively discrete, while the cross-sectional profile data characterizes the over-excavation and under-excavation state after convergence, and the data density is sufficient; therefore, after correcting the cross-sectional profile data by the over-excavation and under-excavation distance, the over-excavation and under-excavation state before convergence can be characterized very accurately. Specifically, the over-excavation and under-excavation distance needs to be configured in the aforementioned polar coordinate system. In specific configuration, the over-excavation and under-excavation distances acquired by each distance sensor are known. At the same time, since each distance sensor is evenly distributed on the shield surface, its position relative to the shield center point is also known. Thus, the position of each distance sensor in the polar coordinate system can be calculated, thereby calculating the position of the detected target exposed surrounding rock corresponding to the over-excavation and under-excavation distance and completing the configuration in the polar coordinate system.

[0028] In this embodiment, after configuring the over-excavation and under-excavation distances, the distance between the center of the measuring circle and the corresponding distance between the center of the contour circle can be calculated. This distance, along with the corresponding distance between the center of the contour circle, can characterize the convergence of the cross-sectional contour data, thereby correcting the cross-sectional contour data using the over-excavation and under-excavation distances. For an example, please refer to [link to example]. Figure 2 The diagram shows the over- and under-excavation distribution maps before and after correction. The dashed lines represent the uncorrected over- and under-excavation distribution map, with the numbers indicating different distance sensors. The solid lines represent the corrected over- and under-excavation distribution map, and the circles represent standard areas. It is clear that areas within the standard areas are under-excavated, while those outside are over-excavated. In this embodiment, the reason for selecting different distances from the center of the circle to calculate the corresponding proportions is that some normally or over-excavated exposed surrounding rock may appear as under-excavated in the cross-sectional profile data after convergence. Selecting the distance to the center of the circle can effectively identify this situation. It should be understood that the under- and over-excavation range in shield tunneling is generally within 20mm. Figure 2 The enlargement is only for accurately representing the corresponding over-excavation and under-excavation ranges.

[0029] In this embodiment, during correction, it is necessary to calculate the ratio of the distance between the center of the measuring circle for each over- or under-excavation distance to the distance between the center of the contour circle of the corresponding cross-sectional contour data. For example, when there are 16 over- or under-excavation distances, 16 convergence ratios need to be calculated. The convergence ratio represents the degree of convergence at the corresponding location. Interpolation can be used to interpolate this convergence ratio to the point of each cross-sectional contour data for correction. The interpolation process can involve linear interpolation between two adjacent over- or under-excavation distances, or nonlinear interpolation by performing a trinomial fitting on the convergence ratios corresponding to three or four adjacent over- or under-excavation distances. This embodiment does not impose any limitations on this approach.

[0030] In one possible implementation, correcting the cross-sectional profile data according to the interpolation convergence ratio includes: The product of the interpolation convergence ratio and the distance between the center circles of the cross-sectional contour data at the corresponding position is calculated as the corrected contour data. The corrected contour data is set in the polar coordinate system and curve fitting is performed to form the corrected over-excavation and under-excavation distribution map.

[0031] When implementing the embodiments of this application, the interpolation convergence ratio obtained by interpolation and the corresponding contour circle center distance can be very close to the actual newly excavated contour data, which makes it easier to analyze the over-excavation and under-excavation caused by the actual excavation.

[0032] In one possible implementation, configuring the over-dumping and under-dumping distance in the polar coordinate system includes: Obtain the polar coordinates of each distance sensor relative to the center point of the shield body, and configure each distance sensor in the polar coordinate system according to the polar coordinates; The over- and under-dig distance is configured in the polar coordinate system by extending the distance sensor position corresponding to the over- and under-dig distance in the polar coordinate system.

[0033] In one possible implementation, the calculation of the distance between the center of the ranging circle includes: Obtain the polar coordinates of each over- or under-dig distance extended at the distance sensor, and calculate the distance to the center of the ranging circle based on the polar coordinates.

[0034] Based on the same inventive concept, this application also provides a shield tunneling construction data monitoring device, including: The distance monitoring module is configured to detect the distance between the target exposed surrounding rock and the shield body at the same cross section using multiple distance sensors as the over- or under-excavation distance; the distance sensors are arranged circumferentially on the shield body, and the detection direction is radially towards the target exposed surrounding rock along the shield body; The cross-section monitoring module is configured to perform cross-section contour scanning on the target exposed surrounding rock after it extends out of the shield body to obtain cross-section contour data. The analysis module is configured to draw an over-excavation and under-excavation distribution map based on the cross-sectional contour data, and to correct the over-excavation and under-excavation distribution map based on the over-excavation and under-excavation distance.

[0035] In one possible implementation, the analysis module is further configured as follows: In the preset polar coordinate system, a circular area is constructed with the center point of the shield body as the center and the diameter of the shield cutterhead as the diameter as the standard area. The shield center point corresponding to the cross-sectional contour data is obtained as the contour center point, and the cross-sectional contour data is set in the polar coordinate system to form the over-excavation and under-excavation distribution map; in the polar coordinate system, the contour center point and the circle center coincide.

[0036] In one possible implementation, the analysis module is further configured as follows: The over- or under-excavation distances are configured in the polar coordinate system, and the distance to the center of the measuring circle corresponding to each over- or under-excavation distance is calculated based on the over- or under-excavation distances; the distance to the center of the measuring circle is the distance from the point corresponding to the over- or under-excavation distance to the center point of the shield body; Obtain the center distance of the profile contour data at each location corresponding to the over-excavation and under-excavation distance, and calculate the ratio of the center distance of the measuring circle to the profile contour data as the convergence ratio at the corresponding location. Interpolate all the aforementioned convergence ratios based on the circumferential distance to form the interpolated convergence ratio corresponding to each cross-sectional contour data point; The cross-sectional profile data is corrected according to the interpolation convergence ratio.

[0037] In one possible implementation, the analysis module is further configured as follows: The product of the interpolation convergence ratio and the distance between the center circles of the cross-sectional contour data at the corresponding position is calculated as the corrected contour data. The corrected contour data is set in the polar coordinate system and curve fitting is performed to form the corrected over-excavation and under-excavation distribution map.

[0038] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0039] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, devices or units, or may be electrical, mechanical or other forms of connection.

[0040] The units described as separate components may or may not be physically separate. As will be apparent to those skilled in the art, the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0041] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0042] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or grid device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0043] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for monitoring shield tunneling construction data, characterized in that, include: The over- or under-excavation distance is determined by detecting the distance between the target exposed surrounding rock and the shield body at the same cross-section using multiple distance sensors; the distance sensors are arranged circumferentially on the shield body, and the detection direction is radially towards the target exposed surrounding rock along the shield body. After the target exposed surrounding rock extends out of the shield, the cross-sectional contour scan of the target exposed surrounding rock is performed to obtain cross-sectional contour data; A distribution map of over-excavation and under-excavation is drawn based on the cross-sectional contour data, and the distribution map of over-excavation and under-excavation is corrected based on the over-excavation and under-excavation distance.

2. The method for monitoring shield tunneling construction data according to claim 1, characterized in that, Drawing an over-excavation and under-excavation distribution map based on the cross-sectional profile data includes: In the preset polar coordinate system, a circular area is constructed with the center point of the shield body as the center and the diameter of the shield cutterhead as the diameter as the standard area. The shield center point corresponding to the cross-sectional contour data is obtained as the contour center point, and the cross-sectional contour data is set in the polar coordinate system to form the over-excavation and under-excavation distribution map; in the polar coordinate system, the contour center point and the circle center coincide.

3. The method for monitoring shield tunneling construction data according to claim 2, characterized in that, The over- and under-excavation distribution map is corrected based on the over- and under-excavation distance, including: The over- or under-excavation distances are configured in the polar coordinate system, and the distance to the center of the measuring circle corresponding to each over- or under-excavation distance is calculated based on the over- or under-excavation distances; the distance to the center of the measuring circle is the distance from the point corresponding to the over- or under-excavation distance to the center point of the shield body; Obtain the center distance of the profile contour data at each location corresponding to the over-excavation and under-excavation distance, and calculate the ratio of the center distance of the measuring circle to the profile contour data as the convergence ratio at the corresponding location. Interpolate all the aforementioned convergence ratios based on the circumferential distance to form the interpolated convergence ratio corresponding to each cross-sectional contour data point; The cross-sectional profile data is corrected according to the interpolation convergence ratio.

4. The method for monitoring shield tunneling construction data according to claim 3, characterized in that, Correcting the cross-sectional profile data according to the interpolation convergence ratio includes: The product of the interpolation convergence ratio and the distance between the center circles of the cross-sectional contour data at the corresponding position is calculated as the corrected contour data. The corrected contour data is set in the polar coordinate system and curve fitting is performed to form the corrected over-excavation and under-excavation distribution map.

5. The method for monitoring shield tunneling construction data according to claim 3, characterized in that, Configuring the over-excavation and under-excavation distance in the polar coordinate system includes: Obtain the polar coordinates of each distance sensor relative to the center point of the shield body, and configure each distance sensor in the polar coordinate system according to the polar coordinates; The over- and under-dig distance is configured in the polar coordinate system by extending the distance sensor position corresponding to the over- and under-dig distance in the polar coordinate system.

6. The method for monitoring shield tunneling construction data according to claim 5, characterized in that, The calculation of the distance between the centers of the ranging circle includes: Obtain the polar coordinates of each over- or under-dig distance extended at the distance sensor, and calculate the distance to the center of the ranging circle based on the polar coordinates.

7. A shield tunneling construction data monitoring device, characterized in that, include: The distance monitoring module is configured to detect the distance between the target exposed surrounding rock and the shield body at the same cross section using multiple distance sensors as the over- or under-excavation distance; the distance sensors are arranged circumferentially on the shield body, and the detection direction is radially towards the target exposed surrounding rock along the shield body; The cross-section monitoring module is configured to perform cross-section contour scanning on the target exposed surrounding rock after it extends out of the shield body to obtain cross-section contour data. The analysis module is configured to draw an over-excavation and under-excavation distribution map based on the cross-sectional contour data, and to correct the over-excavation and under-excavation distribution map based on the over-excavation and under-excavation distance.

8. The shield tunneling construction data monitoring device according to claim 7, characterized in that, The analysis module is also configured to: In the preset polar coordinate system, a circular area is constructed with the center point of the shield body as the center and the diameter of the shield cutterhead as the diameter as the standard area. The shield center point corresponding to the cross-sectional contour data is obtained as the contour center point, and the cross-sectional contour data is set in the polar coordinate system to form the over-excavation and under-excavation distribution map; in the polar coordinate system, the contour center point and the circle center coincide.

9. A shield tunneling construction data monitoring device according to claim 8, characterized in that, The analysis module is also configured to: The over- or under-excavation distances are configured in the polar coordinate system, and the distance to the center of the measuring circle corresponding to each over- or under-excavation distance is calculated based on the over- or under-excavation distances; the distance to the center of the measuring circle is the distance from the point corresponding to the over- or under-excavation distance to the center point of the shield body; Obtain the center distance of the profile contour data at each location corresponding to the over-excavation and under-excavation distance, and calculate the ratio of the center distance of the measuring circle to the profile contour data as the convergence ratio at the corresponding location. Interpolate all the aforementioned convergence ratios based on the circumferential distance to form the interpolated convergence ratio corresponding to each cross-sectional contour data point; The cross-sectional profile data is corrected according to the interpolation convergence ratio.

10. A shield tunneling construction data monitoring device according to claim 9, characterized in that, The analysis module is also configured to: The product of the interpolation convergence ratio and the distance between the center circles of the cross-sectional contour data at the corresponding position is calculated as the corrected contour data. The corrected contour data is set in the polar coordinate system and curve fitting is performed to form the corrected over-excavation and under-excavation distribution map.

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