Road maintenance scheme determination method and system based on distributed optical fibers

Abstract

The invention discloses a road maintenance scheme determination method and system based on distributed optical fibers, and is applied to the technical field of intelligent monitoring, and the method comprises the steps: obtaining a displacement time history curve of vertical displacement at a plurality of feature points of each target road in a target region through the distributed optical fibers; calculating a damage feature value of each feature point according to the displacement time history curve, and averaging the damage feature values of the feature points to obtain a damage value of the target road; and when the damage value exceeds an expected damage value, judging that the target road corresponding to the damage value needs to be maintained. According to the method, the damage condition of the road can be directly judged according to the detection result of the distributed optical fiber, which road needs to be maintained is determined, the road operation and maintenance efficiency is effectively improved, the road operation and maintenance cost is effectively reduced, and invalid maintenance of the road is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of intelligent monitoring technology, specifically to a method and system for determining road maintenance schemes based on distributed optical fibers. Background Technology

[0002] Urban roads and surrounding pipelines are like blood vessels in the human body, serving as the lifeline and critical infrastructure for urban operation. However, during their service life, roads are susceptible to aging and external damage, leading to frequent hidden dangers such as road surface collapse, foundation settlement, pipeline leaks, and line damage, with the location, type, and timing being difficult to predict. Traditional operation and maintenance technologies cannot keep up with the growth rate of urban infrastructure, resulting in enormous pressure on operation and maintenance work.

[0003] In the prior art, Chinese patent application number 202510621718.0 discloses a method for on-site fabrication of distributed optical fiber road sensors and road risk monitoring and early warning, including: optical fiber unit fabrication, concave shallow groove cutting, sensor construction, data acquisition, road surface condition data conversion, time domain signal interval division of scattered light, frequency domain conversion and filtering, multimodal feature extraction and road surface condition identification.

[0004] However, when monitoring road damage using distributed optical fibers, although Brillouin scattering can reflect a certain degree of strain change, it is essentially a weighted value of strain and temperature change, which is difficult to separate; while Rayleigh scattering can detect vibration, but it is difficult to reflect road damage more intuitively; therefore, it is difficult to realize road damage analysis using distributed optical fibers in the current technology. Summary of the Invention

[0005] 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 system for determining road maintenance schemes based on distributed optical fibers.

[0006] In a first aspect, embodiments of this application provide a method for determining road maintenance schemes based on distributed optical fibers, including: Displacement-time history curves of vertical displacement at multiple feature points of each target road in the target area are obtained using distributed optical fibers; the distributed optical fibers are embedded in the target roads during construction. The damage characteristic value of each feature point is calculated based on the displacement-time history curve, and the average value of the damage characteristic value of each feature point is calculated to obtain the damage value of the target road; the feature points are evenly distributed along the longitudinal direction of the target road; When the damage value exceeds the expected damage value, it is determined that the target road corresponding to the damage value needs maintenance.

[0007] In one possible implementation, the calculation of the damage characteristic value includes: The damage characteristic value is calculated by integrating the displacement value over time based on the displacement-time history curve.

[0008] In one possible implementation, the calculation of the expected damage value includes: Construct road test specimens for target roads in the corresponding target area; experimental distributed optical fibers are installed at corresponding locations on the road test specimens; A preset first load spectrum is used to apply a vertical dynamic load to the top of the road test specimen until the surface of the road test specimen cracks, and the experimental displacement time history curve of the vertical displacement at the crack point is recorded through the experimental distributed optical fiber. The expected damage value is calculated by integrating the displacement value over time based on the experimental displacement-time history curve.

[0009] In one possible implementation, the calculation of the expected damage value includes: Construct a finite element model of the target road in the corresponding target area; The top of the finite element model is loaded using a second load spectrum with a duration of one unit time, and the tensile strain time history curve at the bottom of the road surface and the sample displacement time history curve of the vertical displacement at the corresponding distributed optical fiber are obtained in the finite element model. Multiple tensile strain maxima are selected from the tensile strain time history curve using the rainflow counting method, and the road damage within the unit time period is calculated based on the number of times each tensile strain maxima occurs as the tensile strain damage value. Based on the sample displacement time history curve, the displacement value is integrated over time to form the displacement damage value per unit time. The number of cycles required for maintenance of the target road is calculated using the tensile strain damage value; the number of cycles is the number of cycles per unit time. The expected damage value is formed by multiplying the number of cycles by the displacement damage value.

[0010] In one possible implementation, the calculation of the tensile strain damage value includes: Obtain the number of occurrences of each maximum tensile strain within a unit time period, and query the fatigue damage caused by each maximum tensile strain within the unit time period based on the ε-N curve; The tensile strain damage value is formed by summing the fatigue damage corresponding to each maximum tensile strain value.

[0011] Secondly, embodiments of this application also provide a road maintenance scheme determination system based on distributed optical fiber, including: The acquisition unit is configured to acquire displacement-time history curves of vertical displacement at multiple feature points of each target road in the target area via distributed optical fiber; the distributed optical fiber is embedded in the target road during construction. The feature unit is configured to calculate the damage feature value of each feature point based on the displacement-time history curve, and to average the damage feature values ​​of each feature point to obtain the damage value of the target road; the feature points are evenly distributed along the longitudinal direction of the target road; The judgment unit is configured to determine that the target road corresponding to the damage value needs maintenance when the damage value exceeds the expected damage value.

[0012] In one possible implementation, the feature unit is further configured as follows: The damage characteristic value is calculated by integrating the displacement value over time based on the displacement-time history curve.

[0013] In one possible implementation, a first expected unit is also included, configured as follows: Construct road test specimens for target roads in the corresponding target area; experimental distributed optical fibers are installed at corresponding locations on the road test specimens; A preset first load spectrum is used to apply a vertical dynamic load to the top of the road test specimen until the surface of the road test specimen cracks, and the experimental displacement time history curve of the vertical displacement at the crack point is recorded through the experimental distributed optical fiber. The expected damage value is calculated by integrating the displacement value over time based on the experimental displacement-time history curve.

[0014] In one possible implementation, a second expected unit is also included, configured as follows: Construct a finite element model of the target road in the corresponding target area; The top of the finite element model is loaded using a second load spectrum with a duration of one unit time, and the tensile strain time history curve at the bottom of the road surface and the sample displacement time history curve of the vertical displacement at the corresponding distributed optical fiber are obtained in the finite element model. Multiple tensile strain maxima are selected from the tensile strain time history curve using the rainflow counting method, and the road damage within the unit time period is calculated based on the number of times each tensile strain maxima occurs as the tensile strain damage value. Based on the sample displacement time history curve, the displacement value is integrated over time to form the displacement damage value per unit time. The number of cycles required for maintenance of the target road is calculated using the tensile strain damage value; the number of cycles is the number of cycles per unit time. The expected damage value is formed by multiplying the number of cycles by the displacement damage value.

[0015] In one possible implementation, the first expected unit is further configured as follows: Obtain the number of occurrences of each maximum tensile strain within a unit time period, and query the fatigue damage caused by each maximum tensile strain within the unit time period based on the ε-N curve; The tensile strain damage value is formed by summing the fatigue damage corresponding to each maximum tensile strain value.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects: This invention relates to a method and system for determining road maintenance schemes based on distributed optical fiber. It can directly judge the damage status of roads through the results of distributed optical fiber detection, determine which roads need maintenance, thereby effectively improving the efficiency and cost of road operation and maintenance, and greatly reducing ineffective road maintenance. Attached Figure Description

[0017] 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 Schematic diagram of an embodiment of this application. Detailed Implementation

[0018] 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.

[0019] 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.

[0020] Please refer to the following: Figure 1 This is a flowchart illustrating the method for determining a road maintenance scheme based on distributed optical fiber provided in an embodiment of the present invention. Further, the method for determining a road maintenance scheme based on distributed optical fiber may specifically include the contents described in steps S1-S3.

[0021] S1: Obtain displacement-time history curves of vertical displacement at multiple feature points of each target road in the target area using distributed optical fibers; the distributed optical fibers are embedded in the target roads during construction. S2: Calculate the damage characteristic value of each feature point based on the displacement-time history curve, and average the damage characteristic values ​​of each feature point to obtain the damage value of the target road; the feature points are evenly distributed along the longitudinal direction of the target road; S3: When the damage value exceeds the expected damage value, it is determined that the target road corresponding to the damage value needs to be maintained.

[0022] In implementing this application embodiment, distributed optical fibers need to be buried in the target road during construction in the target area. Generally, they need to be buried on the top surface of the substrate and the bottom of the surface layer to facilitate detection and laying. During deployment, the distributed optical fibers need to be laid along the longitudinal direction of the road. After the target road is put into use, the vertical displacement generated by vehicles passing over the target road surface will cause axial strain in the distributed optical fibers, resulting in Rayleigh scattering. This scattering can be captured by analytical instruments to form a vibration time history curve at a certain point. Furthermore, for different feature points, the phase sequences characterized by Rayleigh scattering are independent of each other, so the vibration conditions of different feature points can be distinguished based on this. It should be understood that vibration detection through Rayleigh scattering of distributed optical fibers is a mature existing technology, and the specific process is not limited in this application embodiment.

[0023] In this embodiment of the application, when it is necessary to calculate the damage characteristic value of each feature point through the displacement time history curve, the displacement time history curve can be integrated. Since the vibration displacement generated when the vehicle passes is a unidirectional displacement, the displacement spectral density obtained by integration can effectively characterize the amount of energy accumulated at a certain feature point. When evaluating, for road maintenance, it is necessary to evaluate the overall state of a road and then analyze whether the road needs maintenance. Therefore, after averaging all the damage characteristic values, the average value can be used as the damage value of the road. It should be understood that, for the arrangement of feature points, they generally need to be evenly distributed along the longitudinal direction of the road to better characterize the state of the entire road.

[0024] In the implementation of this application's embodiments, since a highly accurate assessment of road damage is not required in engineering applications, this application's embodiments use a method of calibrating an expected damage value to determine whether the target road requires maintenance. The calibration process can be conducted through experiments or finite element analysis. This application's embodiments, through the aforementioned technical means, can achieve relatively accurate monitoring of urban roads without relying on Brillouin scattering, thereby determining the timing of maintenance for each road, reducing the costs and urban traffic congestion caused by ineffective maintenance.

[0025] In one possible implementation, the calculation of the damage characteristic value includes: The damage characteristic value is calculated by integrating the displacement value over time based on the displacement-time history curve.

[0026] In the implementation of this application, the displacement value is integrated over time to represent the displacement spectral density of the displacement time history curve, which represents the magnitude of energy accumulation and shows a strong positive correlation with the degree of road damage. Therefore, it can be used to evaluate the damage status of the road.

[0027] In one possible implementation, the calculation of the expected damage value includes: Construct road test specimens for target roads in the corresponding target area; experimental distributed optical fibers are installed at corresponding locations on the road test specimens; A preset first load spectrum is used to apply a vertical dynamic load to the top of the road test specimen until the surface of the road test specimen cracks, and the experimental displacement time history curve of the vertical displacement at the crack point is recorded through the experimental distributed optical fiber. The expected damage value is calculated by integrating the displacement value over time based on the experimental displacement-time history curve.

[0028] This application provides a technical solution for calibrating the expected damage value through experiments. First, a road test specimen of the target road needs to be constructed, with the experimental distributed optical fibers deployed in the same locations as the actual optical fibers. Then, a tensile-compression testing machine is used to apply vertical dynamic loading to the top of the road test specimen. The first load spectrum selected can be a load spectrum with a fixed amplitude. Since it is difficult to observe internal cracking of the road test specimen during the experiment, the need for road surface maintenance is determined by observing surface cracking. When cracking occurs on the surface of the road test specimen, the expected damage value can be obtained by integrating the experimental displacement-time history curve corresponding to the crack location.

[0029] In one possible implementation, the calculation of the expected damage value includes: Construct a finite element model of the target road in the corresponding target area; The top of the finite element model is loaded using a second load spectrum with a duration of one unit time, and the tensile strain time history curve at the bottom of the road surface and the sample displacement time history curve of the vertical displacement at the corresponding distributed optical fiber are obtained in the finite element model. Multiple tensile strain maxima are selected from the tensile strain time history curve using the rainflow counting method, and the road damage within the unit time period is calculated based on the number of times each tensile strain maxima occurs as the tensile strain damage value. Based on the sample displacement time history curve, the displacement value is integrated over time to form the displacement damage value per unit time. The number of cycles required for maintenance of the target road is calculated using the tensile strain damage value; the number of cycles is the number of cycles per unit time. The expected damage value is formed by multiplying the number of cycles by the displacement damage value.

[0030] In implementing this application, a method for calibrating expected damage values ​​using a finite element model is also provided when experimental conditions are unavailable. This involves constructing a finite element model of the target road, including its surface layer, base layer, and subbase. A second load spectrum is then constructed, which can employ road vehicle loads specified in standards for more accurate simulation. After loading and calculating the top of the finite element model using the second load spectrum, the tensile strain time history curves of the corresponding elements at the bottom of the road surface in the finite element model can be obtained. These curves can be used for fatigue analysis of the road surface bottom. It should be understood that the road surface bottom mentioned in this embodiment generally refers to the bottom of the road surface layer. Simultaneously, the displacement time history curves of the elements in the finite element model at locations corresponding to the distributed optical fiber in actual conditions can also be obtained.

[0031] In this embodiment, the expected damage value needs to be calibrated using tensile strain time history curves and sample displacement time history curves. Since the second load spectrum is generally a fixed-duration load spectrum (i.e., a unit time), the tensile strain time history curve generated by loading and calculating the second load spectrum within a unit time can characterize the damage at the bottom of the road surface within that unit time. Specifically, this damage can be statistically determined by rainflow counting, identifying the number of different strain levels, and then fatigue damage can be performed by querying the ε-N curve. Fatigue damage based on tensile strain is a mature existing technology, and this embodiment does not impose further limitations. Simultaneously, integrating the displacement value over time on the sample displacement time history curve within a unit time yields the displacement damage value within that unit time. This displacement damage value corresponds to the analyzed tensile strain damage value, and the number of cycles of the tensile strain damage value indicates the final number of maintenance cycles required. Multiplying this number by the displacement damage value yields the accurate expected damage value, completing the calibration.

[0032] In one possible implementation, the calculation of the tensile strain damage value includes: Obtain the number of occurrences of each maximum tensile strain within a unit time period, and query the fatigue damage caused by each maximum tensile strain within the unit time period based on the ε-N curve; The tensile strain damage value is formed by summing the fatigue damage corresponding to each maximum tensile strain value.

[0033] For example, a specific implementation scheme is given here; please refer to [link / reference]. Figure 2 The diagram illustrates the specific process of this solution. The solution is based on a vibration fiber optic detection and alarm system. When constructing a 50m long asphalt concrete road, a 5mm diameter groove is cut longitudinally along the road, 20mm from the top of the base layer. A single-mode communication fiber is placed in the groove and filled with epoxy resin, allowing the fiber and the road structure to vibrate and deform synchronously. The groove location should be aligned as closely as possible with the expected wheel tracks. The fiber is connected to a phase-sensitive optical time-domain reflectometer (OTDR). The phase change of the scattered light is extracted using a Hilbert transform and converted into a vertical displacement time-history curve. The equipment has a spatial resolution of 5m, meaning the feature point spacing is 5m. After sampling the fiber phase data using the ODR, the displacement time-history curve of each feature point can be obtained. Integrating and averaging these curves allows for comparison with the corresponding calibrated damage expectation value, thus obtaining an accurate road condition.

[0034] Based on the same inventive concept, embodiments of this application also provide a road maintenance scheme determination system based on distributed optical fiber, including: The acquisition unit is configured to acquire displacement-time history curves of vertical displacement at multiple feature points of each target road in the target area via distributed optical fiber; the distributed optical fiber is embedded in the target road during construction. The feature unit is configured to calculate the damage feature value of each feature point based on the displacement-time history curve, and to average the damage feature values ​​of each feature point to obtain the damage value of the target road; the feature points are evenly distributed along the longitudinal direction of the target road; The judgment unit is configured to determine that the target road corresponding to the damage value needs maintenance when the damage value exceeds the expected damage value.

[0035] In one possible implementation, the feature unit is further configured as follows: The damage characteristic value is calculated by integrating the displacement value over time based on the displacement-time history curve.

[0036] In one possible implementation, a first expected unit is also included, configured as follows: Construct road test specimens for target roads in the corresponding target area; experimental distributed optical fibers are installed at corresponding locations on the road test specimens; A preset first load spectrum is used to apply a vertical dynamic load to the top of the road test specimen until the surface of the road test specimen cracks, and the experimental displacement time history curve of the vertical displacement at the crack point is recorded through the experimental distributed optical fiber. The expected damage value is calculated by integrating the displacement value over time based on the experimental displacement-time history curve.

[0037] In one possible implementation, a second expected unit is also included, configured as follows: Construct a finite element model of the target road in the corresponding target area; The top of the finite element model is loaded using a second load spectrum with a duration of one unit time, and the tensile strain time history curve at the bottom of the road surface and the sample displacement time history curve of the vertical displacement at the corresponding distributed optical fiber are obtained in the finite element model. Multiple tensile strain maxima are selected from the tensile strain time history curve using the rainflow counting method, and the road damage within the unit time period is calculated based on the number of times each tensile strain maxima occurs as the tensile strain damage value. Based on the sample displacement time history curve, the displacement value is integrated over time to form the displacement damage value per unit time. The number of cycles required for maintenance of the target road is calculated using the tensile strain damage value; the number of cycles is the number of cycles per unit time. The expected damage value is formed by multiplying the number of cycles by the displacement damage value.

[0038] In one possible implementation, the first expected unit is further configured as follows: Obtain the number of occurrences of each maximum tensile strain within a unit time period, and query the fatigue damage caused by each maximum tensile strain within the unit time period based on the ε-N curve; The tensile strain damage value is formed by summing the fatigue damage corresponding to each maximum tensile strain value.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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 determining road maintenance schemes based on distributed optical fibers, characterized in that, include: Displacement-time history curves of vertical displacement at multiple feature points of each target road in the target area are obtained using distributed optical fibers. The distributed optical fiber is buried in the target road during the construction of the target road; The damage characteristic value of each feature point is calculated based on the displacement-time history curve, and the average damage characteristic value of each feature point is calculated to obtain the damage value of the target road; the feature points are evenly distributed along the longitudinal direction of the target road; When the damage value exceeds the expected damage value, it is determined that the target road corresponding to the damage value needs maintenance.

2. The method for determining a road maintenance scheme based on distributed optical fiber according to claim 1, characterized in that, The calculation of the damage characteristic value includes: The damage characteristic value is calculated by integrating the displacement value over time based on the displacement-time history curve.

3. The method for determining a road maintenance scheme based on distributed optical fiber according to claim 1, characterized in that, The calculation of the expected damage value includes: Construct road test specimens for target roads in the corresponding target area; experimental distributed optical fibers are installed at corresponding locations on the road test specimens; A preset first load spectrum is used to apply a vertical dynamic load to the top of the road test specimen until the surface of the road test specimen cracks, and the experimental displacement time history curve of the vertical displacement at the crack point is recorded through the experimental distributed optical fiber. The expected damage value is calculated by integrating the displacement value over time based on the experimental displacement-time history curve.

4. The method for determining a road maintenance scheme based on distributed optical fiber according to claim 1, characterized in that, The calculation of the expected damage value includes: Construct a finite element model of the target road in the corresponding target area; The top of the finite element model is loaded using a second load spectrum with a duration of one unit time, and the tensile strain time history curve at the bottom of the road surface and the sample displacement time history curve of the vertical displacement at the corresponding distributed optical fiber are obtained in the finite element model. Multiple tensile strain maxima are selected from the tensile strain time history curve using the rainflow counting method, and the road damage within the unit time period is calculated based on the number of times each tensile strain maxima occurs as the tensile strain damage value. Based on the sample displacement time history curve, the displacement value is integrated over time to form the displacement damage value per unit time. The number of cycles required for maintenance of the target road is calculated using the tensile strain damage value; the number of cycles is the number of cycles per unit time. The expected damage value is formed by multiplying the number of cycles by the displacement damage value.

5. The method for determining a road maintenance scheme based on distributed optical fiber according to claim 4, characterized in that, The calculation of the tensile strain damage value includes: Obtain the number of occurrences of each maximum tensile strain within a unit time period, and query the fatigue damage caused by each maximum tensile strain within the unit time period based on the ε-N curve; The tensile strain damage value is formed by summing the fatigue damage corresponding to each maximum tensile strain value.

6. A road maintenance scheme determination system based on distributed optical fiber, characterized in that, include: The acquisition unit is configured to acquire displacement-time history curves of vertical displacement at multiple feature points of each target road in the target area via distributed optical fiber; The distributed optical fiber is buried in the target road during the construction of the target road; The feature unit is configured to calculate the damage feature value of each feature point based on the displacement-time history curve, and to average the damage feature values ​​of each feature point to obtain the damage value of the target road; the feature points are evenly distributed along the longitudinal direction of the target road; The judgment unit is configured to determine that the target road corresponding to the damage value needs maintenance when the damage value exceeds the expected damage value.

7. The road maintenance scheme determination system based on distributed optical fiber according to claim 6, characterized in that, The feature unit is further configured to: The damage characteristic value is calculated by integrating the displacement value over time based on the displacement-time history curve.

8. The road maintenance scheme determination system based on distributed optical fiber according to claim 6, characterized in that, It also includes a first expected unit, configured as follows: Construct road test specimens for target roads in the corresponding target area; experimental distributed optical fibers are installed at corresponding locations on the road test specimens; A preset first load spectrum is used to apply a vertical dynamic load to the top of the road test specimen until the surface of the road test specimen cracks, and the experimental displacement time history curve of the vertical displacement at the crack point is recorded through the experimental distributed optical fiber. The expected damage value is calculated by integrating the displacement value over time based on the experimental displacement-time history curve.

9. The road maintenance scheme determination system based on distributed optical fiber according to claim 6, characterized in that, It also includes a second expected unit, configured as follows: Construct a finite element model of the target road in the corresponding target area; The top of the finite element model is loaded using a second load spectrum with a duration of one unit time, and the tensile strain time history curve at the bottom of the road surface and the sample displacement time history curve of the vertical displacement at the corresponding distributed optical fiber are obtained in the finite element model. Multiple tensile strain maxima are selected from the tensile strain time history curve using the rainflow counting method, and the road damage within the unit time period is calculated based on the number of times each tensile strain maxima occurs as the tensile strain damage value. Based on the sample displacement time history curve, the displacement value is integrated over time to form the displacement damage value per unit time. The number of cycles required for maintenance of the target road is calculated using the tensile strain damage value; the number of cycles is the number of cycles per unit time. The expected damage value is formed by multiplying the number of cycles by the displacement damage value.

10. The road maintenance scheme determination system based on distributed optical fiber according to claim 9, characterized in that, The first expected unit is also configured as follows: Obtain the number of occurrences of each maximum tensile strain within a unit time period, and query the fatigue damage caused by each maximum tensile strain within the unit time period based on the ε-N curve; The tensile strain damage value is formed by summing the fatigue damage corresponding to each maximum tensile strain value.

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