Method and device for determining the state of cracking of a tunnel lining

Abstract

The application discloses a tunnel lining crack damage state determination method and device, wherein the method comprises the following steps: acquiring local deformation detection data and lining apparent image of a tunnel; constructing construction joint mileage data sequence according to the lining apparent image; determining tunnel lining segment information parameters, and dividing lining units in the segments according to the tunnel lining segment information parameters; determining lining crack damage indexes in each lining unit; dividing the local deformation detection data according to the division of the lining units in the segments, and determining local deformation indexes of each lining unit; performing normalization processing on the lining crack damage indexes in each lining unit and the local deformation indexes of each lining unit according to units; determining lining crack damage comprehensive indexes of each lining unit in the tunnel; and determining lining crack damage states of each lining unit in the tunnel according to the lining crack damage comprehensive indexes of each lining unit in the tunnel. The application can realize accurate determination of the tunnel lining crack damage state and rapid identification of lining crack damage sections of the tunnel.

Description

Technical Field

[0001] This invention relates to the field of tunnel inspection technology, and in particular to a method and apparatus for determining the crack state of tunnel lining. Background Technology

[0002] This section is intended to provide background or context for the embodiments of the invention set forth in the claims. The description herein is not an admission that it is prior art simply because it is included in this section.

[0003] Traditional tunnel defect data management relies on manual inspections and tabular records. Practice shows that a single tunnel can have thousands of cracks, characterized by diverse forms, scattered distribution, and multiple characteristic attributes. The existing standard, "Deterioration Assessment of Railway Bridge and Tunnel Structures Part 2: Tunnels," clearly defines the grade of cracks, specifying that Grade A cracks must be progressively developed. Grade A indicates that the defect is affecting the lining safety and requires immediate action. Currently, assessing each crack individually yields fragmented results, making it difficult to obtain the overall condition of the lining structure and thus impossible to determine key maintenance sections. Therefore, it is necessary to investigate the density of crack distribution within a specific length to provide a basis for delineating key tunnel sections and subsequently quantitatively tracking their changes. Summary of the Invention

[0004] This invention provides a method for determining the crack state of tunnel lining, enabling accurate determination of the crack state of tunnel lining and rapid identification of cracked sections in the tunnel lining. The method includes:

[0005] Acquire local deformation detection data and lining appearance images of the tunnel;

[0006] Based on the lining appearance image, construction joint mileage information is extracted, and a construction joint mileage data sequence is constructed.

[0007] The tunnel lining segments are divided according to the construction joint mileage data sequence, the tunnel lining segment information parameters are determined, and the lining units within the segments are divided according to the tunnel lining segment information parameters.

[0008] Based on the lining units within the segment, the lining cracking index within each lining unit is determined unit by unit. The lining cracking index includes the circumferential cracking index and the longitudinal cracking index.

[0009] The local deformation detection data are divided according to the division of lining units within the segment, and the local deformation index of each lining unit is determined.

[0010] The lining cracking index and the local deformation index of each lining unit are normalized on a unit-by-unit basis.

[0011] Based on the normalized lining crack index and local deformation index of each lining unit, the comprehensive lining crack index of each lining unit in the tunnel is determined.

[0012] The lining damage status of each lining unit in the tunnel is determined based on the comprehensive index of lining damage of each lining unit.

[0013] This invention also provides a device for determining the crack state of tunnel lining, used to accurately determine the crack state of tunnel lining and quickly identify cracked sections of the tunnel lining. The device includes:

[0014] The lining appearance image acquisition module is used to acquire local deformation detection data and lining appearance images of the tunnel.

[0015] The construction joint mileage data sequence construction module is used to extract construction joint mileage information and construct construction joint mileage data sequence based on the appearance image of the lining.

[0016] The lining unit division module is used to divide the tunnel lining segments according to the construction joint mileage data sequence, determine the tunnel lining segment information parameters, and divide the lining units within the segments according to the tunnel lining segment information parameters.

[0017] The lining cracking index determination module is used to determine the lining cracking index of each lining unit according to the lining unit in the segment. The lining cracking index includes the circumferential cracking index and the longitudinal cracking index.

[0018] The local deformation index determination module is used to divide the local deformation detection data according to the division of lining units within the segment, and determine the local deformation index of each lining unit.

[0019] The normalization module is used to normalize the lining cracking index and the local deformation index of each lining unit on a unit-by-unit basis.

[0020] The lining cracking comprehensive index determination module is used to determine the lining cracking comprehensive index of each lining unit in the tunnel based on the lining cracking index and the local deformation index of each lining unit after normalization.

[0021] The lining crack condition determination module is used to determine the lining crack condition of each lining unit in the tunnel based on the comprehensive lining crack index of each lining unit in the tunnel.

[0022] This invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the above-described method for determining the crack state of tunnel lining.

[0023] This invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for determining the crack state of tunnel lining.

[0024] This invention also provides a computer program product, which includes a computer program that, when executed by a processor, implements the above-described method for determining the crack state of tunnel lining.

[0025] In this embodiment of the invention, compared with the problems of difficulty in accurately evaluating the lining condition and the lack of guidance for tunnel maintenance from fragmented detection data in the prior art, this embodiment of the invention establishes circumferential and longitudinal cracking indices on a segment-by-segment basis, integrates local deformation detection data, and conducts lining cracking condition assessment unit by unit. Through normalization processing, a comprehensive lining cracking index is determined, and the cracking condition of the lining unit is determined based on the comprehensive lining cracking index. This quickly identifies key sections of the entire tunnel cracking condition, thereby determining key maintenance sections of the tunnel, accurately evaluating the lining cracking condition, and providing a basis for the division of key tunnel sections and tracking subsequent lining cracking changes. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0027] Figure 1 This is a flowchart of the method for determining the crack state of tunnel lining in an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram showing the division of each tunnel lining unit in an embodiment of the present invention;

[0029] Figure 3 This is a distribution map of tunnel cracks and defects in an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram of the local deformation of the fourth segment lining in an embodiment of the present invention;

[0031] Figure 5 This is a schematic diagram of the tunnel lining cracking state determination device in an embodiment of the present invention. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0033] Figure 1 This is a flowchart of a method for determining the crack state of tunnel lining in an embodiment of the present invention. The method includes:

[0034] Step 101: Obtain local deformation detection data and lining appearance images of the tunnel;

[0035] Step 102: Extract construction joint mileage information from the lining appearance image and construct a construction joint mileage data sequence.

[0036] Step 103: Divide the tunnel lining segments according to the construction joint mileage data sequence, determine the tunnel lining segment information parameters, and divide the lining units within the segments according to the tunnel lining segment information parameters.

[0037] Step 104: Based on the lining units within the segment, determine the lining cracking index for each lining unit, wherein the lining cracking index includes the circumferential cracking index and the longitudinal cracking index.

[0038] Step 105: Divide the local deformation detection data according to the division of lining units within the segment, and determine the local deformation index of each lining unit.

[0039] Step 106: Normalize the lining cracking index and the local deformation index of each lining unit according to the unit.

[0040] Step 107: Determine the comprehensive index of lining cracking of each lining unit in the tunnel based on the normalized lining cracking index and the local deformation index of each lining unit.

[0041] Step 108: Determine the lining crack status of each lining unit in the tunnel based on the comprehensive index of lining crack in each lining unit in the tunnel.

[0042] The following is a detailed explanation of each step.

[0043] In step 101, local deformation detection data and lining appearance images of the tunnel are acquired.

[0044] In step 102, construction joint mileage information is extracted based on the lining appearance image, and a construction joint mileage data sequence is constructed.

[0045] In a specific embodiment, firstly, an image of the lining surface is acquired, and then construction joint mileage information is obtained by acquiring the lining surface image. The constructed sequence of opening and construction joint mileage data is as follows:

[0046] {f0, f1, f2, f3…f m f m+1}

[0047] In the formula f m This represents the value in the m-th construction joint mileage data sequence. f0 is the mileage of the small mileage side opening, f m+1 This refers to the mileage of the side entrance at the major mileage. Construction joints are a prominent feature of the lining surface left after concrete pouring during construction. In special sections, the spacing between construction joints varies, such as in curved sections and at the location of the lower anchor section, where the distance between two construction joints can be 10-12 meters. Therefore, it is necessary to manually determine the mileage information of each construction joint based on the visual images.

[0048] In step 103, the tunnel lining segments are divided according to the construction joint mileage data sequence, the tunnel lining segment information parameters are determined, and the lining units within the segments are divided according to the tunnel lining segment information parameters.

[0049] In one embodiment, the tunnel lining segment information parameters include: segment type, construction joint information, arching line, centerline of the up and down lines, and tunnel centerline, or any combination thereof.

[0050] In one embodiment, dividing the lining units within a segment according to tunnel lining segment information parameters includes:

[0051] Based on the segment type and construction joint information, divide the segments and determine the number of segments, segment longitudinal width, segment circumferential length, and segment area; based on the arching line, the centerline of the up and down lines, and the centerline of the tunnel, divide the areas of the arch crown, the up and down arch waist, and the up and down sidewalls.

[0052] In a specific embodiment, the lining segments are divided according to the construction joint mileage data sequence, and the size information of each segment is calculated, wherein the longitudinal width B of the i-th segment is... i =f m -f m-1 Segment area A i =B i ×L i In the formula L i The segment circumferential length is determined by the tunnel's speed rating.

[0053] The segmental lining unit division is based on the arch initiation line, dividing the lining sidewalls and arch waist areas. The arch crown and arch waist areas are divided according to the centerline of the up and down lines, such as... Figure 2 As shown. a ij Let i represent each lining unit within a segment, where i represents the segment number and j represents the unit position, j≤5. The sequence of tunnel lining units within a segment is: {a i1 a i2 a i3 a i4a i5}

[0054] In step 104, based on the lining units within the segment, the lining cracking index within each lining unit is determined unit by unit. The lining cracking index includes the circumferential cracking index and the longitudinal cracking index.

[0055] In one embodiment, based on the lining units within a segment, the lining cracking index within each lining unit is determined unit by unit, including:

[0056] The location information determines the lining unit to which the crack belongs;

[0057] The circumferential and longitudinal cracking indices are calculated based on the crack length, width, and angle within the lining unit to which the crack belongs.

[0058] In one embodiment, the circumferential cracking index is calculated according to the following formula:

[0059]

[0060] The longitudinal cracking index is calculated using the following formula:

[0061]

[0062] Where i represents the segment number, j represents the region location, and A ij H represents the area of ​​the segment to be calculated. ij Z represents the circumferential cracking index. ij The longitudinal cracking index, δ k Let l represent the width of the k-th crack. k Let cos(θ) represent the length of the k-th crack. k ) represents the sine value of the angle between the k-th crack and the horizontal line, sin(θ) k ) represents the cosine value of the angle between the k-th crack and the horizontal line.

[0063] In step 105, the local deformation detection data is divided according to the division of lining units within the segment, and the local deformation index of each lining unit is determined.

[0064] In one embodiment, the local deformation index of each lining unit is determined according to the following formula:

[0065]

[0066] Among them, D ij Let c represent the local deformation index of the lining of the i-th segment j-th element, c represent the number of local deformation data within the element, and d represent the local deformation index of the lining. z denoted by , where z represents the z-th deformation value.

[0067] In step 106, the lining cracking index and the local deformation index of each lining unit are normalized on a unit-by-unit basis. In one embodiment, the normalization of the lining cracking index and the local deformation index of each lining unit on a unit-by-unit basis includes:

[0068] The circumferential cracking index, longitudinal cracking index, and local deformation index are normalized according to unit categories. The normalization process linearly transforms the indices with different dimensions into dimensionless parameters within the range of [0,1]. The calculation formula is as follows:

[0069]

[0070]

[0071]

[0072] Where g is the normalized parameter; This represents the normalized longitudinal cracking index of the i-th segment j-th unit; This represents the normalized circumferential cracking index within the j-th segment of the i-th section. The normalized local deformation exponent of the i-th segment j element is represented by max(H). ij ) represents the maximum circumferential cracking index of each unit within the entire tunnel, max(Z) ij ) represents the maximum longitudinal crack index of each unit within the entire tunnel, max(D ij ) represents the maximum local deformation index of each unit within the entire tunnel.

[0073] In step 107, the comprehensive index of lining cracking of each lining unit in the tunnel is determined based on the normalized lining cracking index and the local deformation index of each lining unit.

[0074] In one embodiment, the comprehensive index of lining cracking for each lining unit within the tunnel is determined based on the normalized lining cracking index and the local deformation index of each lining unit, including:

[0075] Based on the impact on the safety of the tunnel lining, different weights are assigned to the normalized parameters, and the comprehensive index of tunnel lining cracking is calculated as follows:

[0076]

[0077] Where W ij This represents the comprehensive index of lining cracking; k1, k2, and k3 represent the weights of each parameter, and k1+k2+k3=3.

[0078] Lining damage generally refers to three states on the lining surface: cracking, crushing, and misalignment. Partial cracking is caused by changes in ambient temperature, and this type of damage has little impact on lining safety. Partial damage results from localized deformation of the lining, which severely affects lining safety. Therefore, the comprehensive lining damage index correlates localized deformation with different types of damage, improving the analytical level of the impact of cracks on the state of lining segments. In step 108, the lining damage state of each lining unit within the tunnel is determined based on the comprehensive lining damage index of each lining unit.

[0079] In one embodiment, the lining cracking state of each lining unit in the tunnel is determined based on the comprehensive index of lining cracking in each lining unit, including:

[0080] Based on the comprehensive cracking index of each lining unit, an index distribution diagram is drawn along the length of the line.

[0081] The plotted index distribution map is analyzed and compared with the historical index distribution map to obtain the analysis and comparison results. The analysis and comparison results include the annual change rate of the lining segment cracking index and the annual average change rate of the lining unit cracking index.

[0082] Based on the analysis and comparison results, the current cracking status of each lining unit is identified.

[0083] In a specific embodiment, lining units with a comprehensive cracking index above a preset threshold are identified as the most unfavorable lining units. Alternatively, the damage development status of each unit can be identified based on the analysis and comparison results of the index distribution map. This index distribution map can quickly determine the key maintenance sections of a single tunnel; statistically comparing and analyzing the comprehensive cracking indices of different tunnels, examining the annual average change rate of the segmental lining crack index and the annual change rate of the key segmental lining crack index, can provide a basis for identifying key tunnels.

[0084] In one specific embodiment, a 50m section of a tunnel is used as an example for illustration. It is assumed that the construction joints in this section are distributed at 10m intervals. The construction joint data sequence is represented as: {10, 20, 30, 40}.

[0085] The segmental lining is divided into units based on the arch initiation line, specifically the lining sidewalls and arch waist areas; and based on the centerline of the up and down lines, the arch crown and arch waist areas are divided, as detailed below. Figure 2 As shown in Table 1, taking a single segment as an example, the dimensions of each lining unit within the segment are as follows:

[0086] Table 1 Dimensions of each lining unit within the segment

[0087] Serial Number area <![CDATA[Area = (length × width) (m 2 )]]> <![CDATA[a i1 ]]> Upward sidewall 40＝10×4 <![CDATA[a i2 ]]> arching back 70＝10×7 <![CDATA[a i3 ]]> dome 50＝10×5 <![CDATA[a i4 ]]> Downward arching 70＝10×7 <![CDATA[a i5 ]]> Downward sidewall 40＝10×4

[0088] Based on the above dimensions, the tunnel lining segment area for this section is 270m².2 Based on the visual image detection results, there are 10 cracks distributed in this section, and the characteristic parameters of each crack are shown in Table 2.

[0089] Table 2. Characteristic parameters of each cracking parameter within the section.

[0090]

[0091]

[0092] The tunnel lining surface is unfolded in a plane, and the cracks obtained from a single inspection are projected onto this unfolded plane. L is the crack length, W is the crack width, and each lining unit within a segment is represented by a. ij This indicates that i represents the segment number, j represents the unit position, and j≤5. For example... Figure 3 As shown in Table 3, the long cracks are divided into unit grids, and the crack index of each lining unit is shown in Table 3.

[0093] Table 3 shows the calculation results of the cracking index of each lining unit in the section.

[0094]

[0095] The results after normalization by unit classification are shown in Table 4:

[0096] Table 4 shows the calculation results of the normalized cracking index for each lining unit within the section.

[0097]

[0098]

[0099] Assuming local deformation exists in the fourth segment, with local deformation indices {0, 0.003, -0.001, 0.002, 0}, the deformed lining morphology is as follows. Figure 4 As shown. The normalized result is {0, 1, 0.33, 0.66, 0};

[0100] Based on the normalized unit lining cracking index and local deformation index, the comprehensive lining cracking index was calculated, and the results are shown in Table 5. Assuming a threshold of 0.8, then a 42 The element is the most unfavorable element.

[0101] Table 5 shows the normalized calculation results of the comprehensive condition index of each lining unit within the section.

[0102] type 1 segment 2 segments 3 segments 4 segments 5 segments Upward sidewall 0.45 0.00 0.66 0.24 0.63 arching back 0.21 0.00 0.29 1.00 0.55 dome 0.00 0.67 0.00 0.11 0.00 Downward arching 0.49 0.00 0.05 0.61 0.19 Downward sidewall 0.64 0.00 0.45 0.66 0.41

[0103] This invention also provides a device for determining the crack state of tunnel lining, as described in the following embodiments. Since the principle by which this device solves the problem is similar to the method for determining the crack state of tunnel lining, the implementation of this device can refer to the implementation of the method for determining the crack state of tunnel lining; repeated details will not be elaborated further. Figure 5 This is a schematic diagram of a tunnel lining cracking condition determination device according to an embodiment of the present invention. The device includes:

[0104] The lining appearance image acquisition module 501 is used to acquire local deformation detection data and lining appearance images of the tunnel.

[0105] The construction joint mileage data sequence construction module 502 is used to extract construction joint mileage information and construct construction joint mileage data sequence based on the lining appearance image.

[0106] The lining unit division module 503 is used to divide the tunnel lining segments according to the construction joint mileage data sequence, determine the tunnel lining segment information parameters, and divide the lining units within the segments according to the tunnel lining segment information parameters.

[0107] The lining cracking index determination module 504 is used to determine the lining cracking index of each lining unit according to the lining unit in the segment. The lining cracking index includes the circumferential cracking index and the longitudinal cracking index.

[0108] The local deformation index determination module 505 is used to divide the local deformation detection data according to the division of lining units within the segment and determine the local deformation index of each lining unit.

[0109] The normalization module 506 is used to normalize the lining cracking index and the local deformation index of each lining unit on a unit-by-unit basis.

[0110] The lining cracking comprehensive index determination module 507 is used to determine the lining cracking comprehensive index of each lining unit in the tunnel based on the lining cracking index and the local deformation index of each lining unit after normalization.

[0111] The lining crack condition determination module 508 is used to determine the lining crack condition of each lining unit in the tunnel based on the comprehensive index of lining crack in each lining unit in the tunnel.

[0112] This invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the above-described method for determining the crack state of tunnel lining.

[0113] This invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for determining the crack state of tunnel lining.

[0114] This invention also provides a computer program product, which includes a computer program that, when executed by a processor, implements the above-described method for determining the crack state of tunnel lining.

[0115] In this embodiment of the invention, compared with the problems of difficulty in accurately evaluating the lining condition and the lack of guidance for tunnel maintenance from fragmented detection data in the prior art, this embodiment of the invention establishes circumferential and longitudinal cracking indices on a segment-by-segment basis, integrates local deformation detection data, and conducts lining cracking condition assessment unit by unit. Through normalization processing, a comprehensive lining cracking index is determined, and the cracking condition of the lining unit is determined based on the comprehensive lining cracking index. This quickly identifies key sections of the entire tunnel cracking condition, thereby determining key maintenance sections of the tunnel, accurately evaluating the lining cracking condition, and providing a basis for the division of key tunnel sections and tracking subsequent lining cracking changes.

[0116] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0117] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0118] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0119] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0120] 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 descriptions are merely specific embodiments of the present invention and are 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 determining the crack state of tunnel lining, characterized in that, include: Acquire local deformation detection data and lining appearance images of the tunnel; Based on the lining appearance image, construction joint mileage information is extracted, and a construction joint mileage data sequence is constructed. The tunnel lining segments are divided according to the construction joint mileage data sequence, the tunnel lining segment information parameters are determined, and the lining units within the segments are divided according to the tunnel lining segment information parameters. Based on the lining units within the segment, the lining cracking index within each lining unit is determined unit by unit. The lining cracking index includes the circumferential cracking index and the longitudinal cracking index. The local deformation detection data are divided according to the division of lining units within the segment, and the local deformation index of each lining unit is determined. The lining cracking index and the local deformation index of each lining unit are normalized on a unit-by-unit basis. Based on the normalized lining crack index and local deformation index of each lining unit, the comprehensive lining crack index of each lining unit in the tunnel is determined. The lining cracking status of each lining unit in the tunnel is determined based on the comprehensive index of lining cracking in each lining unit. Based on the lining units within a segment, the lining cracking index within each lining unit is determined, including: The location information determines the lining unit to which the crack belongs; The circumferential cracking index and the longitudinal cracking index are calculated based on the crack length, width, and angle within the lining unit to which the crack belongs. Calculate the circumferential cracking index using the following formula: ； The longitudinal cracking index is calculated using the following formula: ； in, Indicates the segment number. Indicates the location of the area. This represents the area of ​​the unit to be calculated. Z represents the circumferential cracking index. ij Indicates the longitudinal cracking index. Indicates the first The width of the crack is... Indicates the first Strip crack length, Indicates the first The sine value of the angle between the crack and the horizontal line. Indicates the first The cosine of the angle between the crack and the horizontal line.

2. The method as described in claim 1, characterized in that, The tunnel lining segment information parameters include: segment type, construction joint information, arching line, centerline of the up and down lines, and tunnel centerline, or any combination thereof.

3. The method as described in claim 2, characterized in that, Based on the tunnel lining segment information parameters, the lining units within the segment are divided, including: Based on the segment type and construction joint information, divide the segments and determine the number of segments, segment longitudinal width, segment circumferential length, and segment area; based on the arching line, the centerline of the up and down lines, and the centerline of the tunnel, divide the areas of the arch crown, the up and down arch waist, and the up and down sidewalls.

4. The method as described in claim 1, characterized in that, The local deformation index of each lining unit is determined according to the following formula: ； in, Indicates the first Segment Local deformation index of unit lining d represents the number of local deformation data within the element. z This represents the local deformation value. Indicates the first A number of deformation values.

5. The method as described in claim 4, characterized in that, The lining cracking index and the local deformation index of each lining unit were normalized on a unit-by-unit basis, including: The circumferential cracking index, longitudinal cracking index, and local deformation index are normalized according to unit categories. The normalization process linearly transforms the indices with different dimensions into dimensionless parameters within the range of [0,1]. The calculation formula is as follows: ； ； ； Where g is the normalized parameter; Represents the normalized i-th Segment Unit longitudinal cracking index; Represents the normalized i-th Segment Intra-unit circumferential cracking index Represents the normalized i-th Segment Element local deformation index This represents the maximum circumferential cracking index of each unit within the entire tunnel. This represents the maximum longitudinal cracking index of each unit within the entire tunnel. This represents the maximum local deformation index of each unit within the entire tunnel.

6. The method as described in claim 5, characterized in that, Based on the normalized lining cracking index and local deformation index of each lining unit, the comprehensive lining cracking index of each lining unit in the tunnel is determined, including: Based on the impact on the safety of the tunnel lining, different weights are assigned to the normalized parameters, and the comprehensive index of tunnel lining cracking is calculated as follows: ； Wherein, W ij This represents the comprehensive index of lining cracking; k1, k2, and k3 represent the weights of each parameter, and k1+k2+k3=3.

7. The method as described in claim 1, characterized in that, The lining cracking status of each lining unit within the tunnel is determined based on the comprehensive lining cracking index of each lining unit, including: Based on the comprehensive cracking index of each lining unit, an index distribution diagram is drawn along the length of the line. The plotted index distribution map is analyzed and compared with the historical index distribution map to obtain the analysis and comparison results. The analysis and comparison results include the annual change rate of the lining segment cracking index and the annual average change rate of the lining unit cracking index. Based on the analysis and comparison results, the current cracking status of each lining unit is identified.

8. A device for determining the crack state of tunnel lining, characterized in that, include: The lining appearance image acquisition module is used to acquire local deformation detection data and lining appearance images of the tunnel. The construction joint mileage data sequence construction module is used to extract construction joint mileage information and construct construction joint mileage data sequence based on the appearance image of the lining. The lining unit division module is used to divide the tunnel lining segments according to the construction joint mileage data sequence, determine the tunnel lining segment information parameters, and divide the lining units within the segments according to the tunnel lining segment information parameters. The lining cracking index determination module is used to determine the lining cracking index of each lining unit according to the lining unit in the segment. The lining cracking index includes the circumferential cracking index and the longitudinal cracking index. The local deformation index determination module is used to divide the local deformation detection data according to the division of lining units within the segment, and determine the local deformation index of each lining unit. The normalization module is used to normalize the lining cracking index and the local deformation index of each lining unit on a unit-by-unit basis. The lining cracking comprehensive index determination module is used to determine the lining cracking comprehensive index of each lining unit in the tunnel based on the lining cracking index and the local deformation index of each lining unit after normalization. The lining crack condition determination module is used to determine the lining crack condition of each lining unit in the tunnel based on the comprehensive lining crack index of each lining unit in the tunnel. The lining cracking index determination module is specifically used for: The location information determines the lining unit to which the crack belongs; The circumferential cracking index and the longitudinal cracking index are calculated based on the crack length, width, and angle within the lining unit to which the crack belongs. Calculate the circumferential cracking index using the following formula: ； The longitudinal cracking index is calculated using the following formula: ； in, Indicates the segment number. Indicates the location of the area. This represents the area of ​​the unit to be calculated. Z represents the circumferential cracking index. ij Indicates the longitudinal cracking index. Indicates the first The width of the crack is... Indicates the first Strip crack length, Indicates the first The sine value of the angle between the crack and the horizontal line. Indicates the first The cosine of the angle between the crack and the horizontal line.

9. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method of any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the method of any one of claims 1 to 7.

11. A computer program product, characterized in that, The computer program product includes a computer program that, when executed by a processor, implements the method of any one of claims 1 to 7.

Images