Distributed fiber based method and system for determining road maintenance solutions

Abstract

The application discloses a distributed optical fiber-based road maintenance scheme determination method and system, and is applied to the technical field of intelligent monitoring.The method comprises the following steps: obtaining a displacement time history curve of vertical displacement of a plurality of characteristic points of each target road in a target area through a distributed optical fiber; calculating a damage characteristic value of each characteristic point according to the displacement time history curve, and averaging the damage characteristic value of each characteristic point 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.The application can directly judge the damage condition of a road according to the detection result of the distributed optical fiber, determine which road needs to be maintained, and effectively improve the efficiency and cost of road operation and maintenance, and greatly reduce invalid road maintenance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of intelligent monitoring, in particular to a road maintenance scheme determination method and system based on distributed optical fibers. BACKGROUND

[0002] Urban roads and surrounding pipelines are like blood vessels in the human body, and are the lifeline and key infrastructure of urban operation. However, during service, roads are easily affected by aging and external damage, and hidden dangers such as road collapse, foundation settlement, pipeline leakage, and line damage frequently occur, and the location, type, and time are difficult to predict. Traditional operation and maintenance technology cannot keep up with the growth of urban infrastructure, resulting in a huge pressure on operation and maintenance work.

[0003] In the prior art, a Chinese patent with application number 202510621718.0 discloses a field manufacturing of a distributed optical fiber road sensor and a road risk monitoring and early warning method, which includes: optical fiber unit manufacturing, concave shallow groove cutting, sensor construction, data acquisition, road surface state data conversion, scattered light time domain signal interval division, frequency domain conversion and filtering processing, multi-modal feature extraction, and road surface condition identification.

[0004] However, when monitoring road damage by using distributed optical fibers, Brillouin scattering can reflect a certain degree of strain change, but its essence is the weighted value of strain and temperature change, which is difficult to separate. Rayleigh scattering can detect vibration, but it is difficult to more directly reflect road damage. Therefore, it is difficult to analyze road damage by using distributed optical fibers in the prior art. SUMMARY

[0005] In order to at least overcome the above-mentioned deficiencies in the prior art, the purpose of the present application is to provide a road maintenance scheme determination method and system based on distributed optical fibers.

[0006] In a first aspect, the embodiments of the present application provide a road maintenance scheme determination method based on distributed optical fibers, which comprises:

[0007] Obtaining a displacement time history curve of the vertical displacement of each feature point of a target road in a target area by using a distributed optical fiber; the distributed optical fiber is buried in the target road during construction of the target road;

[0008] Calculating a damage feature value of each feature point according to the displacement time history curve, and obtaining a damage value of the target road by averaging the damage feature value of each feature point; the feature points are uniformly arranged along the longitudinal direction of the target road;

[0009] When the damage value exceeds an expected damage value, it is determined that the target road corresponding to the damage value needs to be maintained.

[0010] In a possible implementation, the calculation of the damage characteristic value comprises:

[0011] The damage characteristic value is calculated by integrating displacement values with respect to time according to the displacement time history curve.

[0012] In a possible implementation, the calculation of the damage expectation value comprises:

[0013] A road surface test piece of a target road corresponding to a target area is constructed; the road surface test piece is provided with an experimental distributed optical fiber at a corresponding part;

[0014] The top of the road surface test piece is vertically dynamically loaded by a preset first load spectrum to cause the surface of the road surface test piece to crack, and an experimental displacement time history curve of the vertical displacement at the cracking point is recorded by the experimental distributed optical fiber;

[0015] The damage expectation value is calculated by integrating displacement values with respect to time according to the experimental displacement time history curve.

[0016] In a possible implementation, the calculation of the damage expectation value comprises:

[0017] A finite element model of a target road corresponding to a target area is constructed;

[0018] The top of the finite element model is loaded by a second load spectrum with a unit time length, and a tensile strain time history curve of the road surface bottom of the finite element model and a sample displacement time history curve of the vertical displacement at the distributed optical fiber are obtained;

[0019] A plurality of tensile strain maxima are selected from the tensile strain time history curve by rainflow counting, and the damage condition of the road in the unit time length is calculated as a tensile strain damage value according to the number of occurrences of each tensile strain maximum;

[0020] The displacement damage value in the unit time length is formed by integrating displacement values with respect to time according to the sample displacement time history curve;

[0021] The cycle number of the target road when maintenance is required is calculated by the tensile strain damage value; the cycle number is the number of cycle unit time lengths;

[0022] The damage expectation value is formed by multiplying the cycle number by the displacement damage value.

[0023] In a possible implementation, the calculation of the tensile strain damage value comprises:

[0024] The number of occurrences of each tensile strain maximum in the unit time length is obtained, and the fatigue damage caused by each tensile strain maximum in the unit time length is queried according to an ε-N curve;

[0025] Summing up fatigue damage corresponding to each tensile strain maximum value forms the tensile strain damage value.

[0026] In a second aspect, the embodiments of the present application also provide a distributed optical fiber-based road maintenance scheme determination system, comprising:

[0027] An acquisition unit is configured to acquire, through a distributed optical fiber, displacement time history curves of vertical displacements at a plurality of feature points of each target road in a target area; the distributed optical fiber is buried in the target road during construction of the target road;

[0028] A feature unit is configured to calculate damage feature values of each feature point according to the displacement time history curves, and acquire an average value of the damage feature values of each feature point to obtain a damage value of the target road; the feature points are uniformly arranged along a longitudinal direction of the target road;

[0029] A judgment unit is configured to judge that the target road corresponding to the damage value needs to be maintained when the damage value exceeds a damage expected value.

[0030] In a possible implementation, the feature unit is further configured to:

[0031] Integrate displacement values with respect to time according to the displacement time history curves to calculate the damage feature values.

[0032] In a possible implementation, the system further comprises a first expectation unit configured to:

[0033] Construct a road surface test piece of the target road corresponding to the target area; the road surface test piece is provided with an experimental distributed optical fiber at a corresponding part;

[0034] Vertically dynamically load a top of the road surface test piece by a preset first load spectrum to cause the road surface test piece to crack on a surface, and record an experimental displacement time history curve of vertical displacements at a cracking point position by the experimental distributed optical fiber;

[0035] Integrate displacement values with respect to time according to the experimental displacement time history curve to calculate the damage expected value.

[0036] In a possible implementation, the system further comprises a second expectation unit configured to:

[0037] Construct a finite element model of the target road corresponding to the target area;

[0038] Load a top of the finite element model by a second load spectrum with a unit time length, and acquire a tensile strain time history curve of a road surface bottom of the finite element model and a sample displacement time history curve of vertical displacements at the distributed optical fiber;

[0039] Rainflow counting method is performed on the tensile strain time curve to select a plurality of tensile strain maxima, and damage of the road in the unit time is calculated as a tensile strain damage value according to the number of occurrences of each tensile strain maximum;

[0040] According to the sample displacement time curve, displacement value is integrated with respect to time to form a displacement damage value in a unit time;

[0041] The cycle number of the target road when maintenance is required is calculated by the tensile strain damage value; the cycle number is the number of cycle unit times;

[0042] The cycle number is multiplied by the displacement damage value to form the damage expectation value.

[0043] In a possible implementation, the first expectation unit is further configured to:

[0044] The number of occurrences of each tensile strain maximum in a unit time is obtained, and fatigue damage caused by each tensile strain maximum in the unit time is inquired according to an ε-N curve;

[0045] The fatigue damage corresponding to each tensile strain maximum is summed to form the tensile strain damage value.

[0046] Compared with the prior art, the present application has the following advantages and beneficial effects:

[0047] The present application is based on a distributed optical fiber-based road maintenance scheme determination method and system, which can directly judge the damage condition of the road through the detection results of the distributed optical fiber, determine which road needs to be maintained, and effectively improve the efficiency and cost of road operation and maintenance, greatly reducing the invalid maintenance of the road. BRIEF DESCRIPTION OF DRAWINGS

[0048] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present application and constitute a part of the application, do not limit the embodiments of the present application. In the drawings:

[0049] Figure 1 The present application is based on a distributed optical fiber-based road maintenance scheme determination method and system, which can directly judge the damage condition of the road through the detection results of the distributed optical fiber, determine which road needs to be maintained, and effectively improve the efficiency and cost of road operation and maintenance, greatly reducing the invalid maintenance of the road.

[0050] Figure 2 The present application is based on a distributed optical fiber-based road maintenance scheme determination method and system, which can directly judge the damage condition of the road through the detection results of the distributed optical fiber, determine which road needs to be maintained, and effectively improve the efficiency and cost of road operation and maintenance, greatly reducing the invalid maintenance of the road. DETAILED DESCRIPTION

[0051] In order to make the purposes, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. It should be understood that the drawings in the present application serve only the purpose of description and illustration, and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn according to the actual proportions. The flowcharts used in the present application show the operations implemented according to some embodiments of the embodiments of the present application. It should be understood that the operations of the flowcharts can not be implemented in sequence, and the steps without logical context relationship can be reversed in sequence or implemented simultaneously. In addition, one or more other operations can be added to the flowcharts or one or more operations can be removed from the flowcharts under the guidance of the content of the present application.

[0052] In addition, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0053] Please refer to Figure 1 The flowchart of the method for determining a road maintenance scheme based on distributed optical fibers provided by the embodiments of the present application, and further, the method for determining a road maintenance scheme based on distributed optical fibers can specifically include the contents described in the following steps S1 to S3.

[0054] S1: Obtain a displacement time history curve of a vertical displacement of each feature point of a target road in a target area through a distributed optical fiber; the distributed optical fiber is buried in the target road during construction of the target road;

[0055] S2: Calculate a damage characteristic value of each feature point according to the displacement time history curve, and obtain a damage value of the target road by averaging the damage characteristic values of each feature point; the feature points are uniformly arranged along the longitudinal direction of the target road;

[0056] S3: When the damage value exceeds an expected damage value, it is determined that the target road corresponding to the damage value needs to be maintained.

[0057] In the implementation of the embodiments of the present application, when the target road construction in the target area is needed, the distributed optical fiber is buried in the target road, which is generally needed to be buried in the top surface of the base and the bottom of the surface layer for facilitating detection and laying; when laying, the distributed optical fiber is laid along the longitudinal direction of the road. After the target road is put into use, the vertical displacement generated by the vehicle when passing through the target road will cause the axial strain of the distributed optical fiber, and then generate Rayleigh scattering, which can be captured by the analyzer to form the vibration time history curve of a certain point; at the same time, the phase sequences represented by the Rayleigh scattering generated by different characteristic points are independent of each other, so the vibration conditions of different characteristic points can be distinguished based on this. It should be understood that the vibration detection by Rayleigh scattering of the distributed optical fiber belongs to the mature prior art, and the specific process is not limited in the embodiments of the present application.

[0058] In the embodiments of the present application, when the damage characteristic value of each characteristic point is calculated by the displacement time history curve, the integral of the displacement time history curve can be used for calculation. Since the vibration displacement generated when the vehicle passes through is unidirectional displacement, the displacement spectral density obtained by integration can effectively represent the energy accumulated at a certain characteristic point. When evaluating, for road maintenance, the overall state of a road needs to be evaluated to analyze whether the road needs to be maintained, so the average value of all damage characteristic values is taken as the damage value of the road. It should be understood that for the arrangement of characteristic points, they are generally arranged uniformly along the longitudinal direction of the road, so as to better represent the state of the entire road.

[0059] In the implementation of the embodiments of the present application, in engineering applications, since it is not necessary to accurately evaluate the damage condition of the road, the embodiments of the present application adopt a method of calibrating an expected damage value to determine whether the target road needs to be maintained. The calibration process can be carried out by test or finite element calculation. The embodiments of the present application can accurately monitor the urban road without using Brillouin scattering, so as to determine the time when each road needs to be maintained and reduce the cost and urban road congestion caused by invalid maintenance.

[0060] In a possible implementation, the calculation of the damage characteristic value comprises:

[0061] According to the displacement time history curve, the displacement value is integrated with respect to time to calculate the damage characteristic value.

[0062] In the implementation of the embodiments of the present application, the integral of the displacement value with respect to time represents the displacement spectral density of the displacement time history curve, which represents the size of energy accumulation and has a strong positive correlation with the degree of road damage, so it can be used to evaluate the damage condition of the road.

[0063] In a possible implementation, the calculation of the damage expectation value comprises:

[0064] constructing a road surface test piece of a target road corresponding to a target area; the road surface test piece is provided with an experimental distributed optical fiber at a corresponding position;

[0065] vertically dynamically loading a top of the road surface test piece by a preset first load spectrum to cause the road surface test piece to crack on a surface, and recording an experimental displacement time history curve of vertical displacement at a cracking point by the experimental distributed optical fiber;

[0066] integrating displacement values with respect to time according to the experimental displacement time history curve to calculate the damage expectation value.

[0067] When the embodiments are implemented, a technical solution for damage expectation value calibration in an experimental manner is provided, wherein a road surface test piece of a target road is first constructed, and an experimental distributed optical fiber arranged therein needs to be the same as an actual arrangement position; then a tensile testing machine is used to vertically dynamically load a top of the road surface test piece, and a first load spectrum selected can be a load spectrum with a fixed amplitude. Since it is difficult to observe cracking inside the road surface test piece in the experiment, it is determined whether the road surface needs to be maintained by observing surface cracking of the road surface test piece. When surface cracking of the road surface test piece occurs, the damage expectation value can be obtained by integrating a corresponding experimental displacement time history curve at a cracking position.

[0068] In a possible implementation, the calculation of the damage expectation value comprises:

[0069] constructing a finite element model of a target road corresponding to a target area;

[0070] loading a top of the finite element model by a second load spectrum with a unit time length, and obtaining a tensile strain time history curve of a road surface bottom in the finite element model and a sample displacement time history curve of vertical displacement at the distributed optical fiber;

[0071] selecting a plurality of tensile strain maxima from the tensile strain time history curve by rain flow counting, and calculating a damage condition of the road in the unit time length as a tensile strain damage value according to a number of occurrences of each tensile strain maximum;

[0072] integrating displacement values with respect to time according to the sample displacement time history curve to form a displacement damage value in the unit time length;

[0073] calculating a cycle number when the target road needs to be maintained by the tensile strain damage value; the cycle number is a number of cycle unit time lengths;

[0074] multiplying the cycle number by the displacement damage value to form the damage expectation value.

[0075] The application also provides a method for calibrating the damage expectation value by using a finite element model without experimental conditions. The finite element model of the target road is constructed, and the finite element model needs to include the surface layer, the base layer and the cushion layer of the road. Then, a second load spectrum is constructed, and the second load spectrum can use the vehicle load specified in the specification to simulate more accurately. The tensile strain time history curve of the corresponding unit at the bottom of the road in the finite element model can be obtained by loading the top of the finite element model by the second load spectrum and calculating, which can be used for fatigue analysis of the bottom of the road. It should be understood that the bottom of the road in the embodiment refers to the bottom of the surface layer of the road. Meanwhile, the displacement time history curve of the unit in the finite element model at the corresponding position of the distributed optical fiber in the actual situation can also be obtained.

[0076] In the embodiment of the application, the damage expectation value is calibrated by the tensile strain time history curve and the sample displacement time history curve. Since the second load spectrum generally uses a fixed time load spectrum, i.e., a unit time, the tensile strain time history curve generated by loading and calculating the second load spectrum in a unit time can represent the damage of the road bottom in a unit time. Specifically, the damage can be counted by the rain flow counting method according to the number of different strain degrees, and then the fatigue damage is obtained by querying the ε-N curve. The fatigue damage based on the tensile strain is a mature prior art, and the embodiment of the application does not make further limitation. Meanwhile, the displacement damage value in a unit time can be obtained by integrating the displacement value with respect to time for the sample displacement time history curve in a unit time. At this time, the displacement damage value and the tensile strain damage value obtained by analysis are in a corresponding relationship, and the number of cycles of the tensile strain damage value can represent the final number of cycles that need to be maintained. The accurate damage expectation value can be obtained by multiplying the number of cycles by the displacement damage value to complete the calibration.

[0077] In a possible implementation, the calculation of the tensile strain damage value comprises:

[0078] The number of occurrences of each tensile strain maximum value in a unit time is obtained, and the fatigue damage caused by each tensile strain maximum value in the unit time is obtained according to the ε-N curve;

[0079] The fatigue damage corresponding to each tensile strain maximum value is summed to form the tensile strain damage value.

[0080] For example, a specific implementation scheme is given here, please refer to Figure 2, shows the specific process of the scheme. The specific scheme is based on a set of vibration optical fiber detection alarm system, wherein, when a 50m long newly built asphalt concrete road is built, a 5mm diameter groove is opened on the top of the base layer of the road along the longitudinal direction of the road, and a single mode communication optical fiber is placed in the groove, and epoxy resin is poured to make the optical fiber and the road structure vibrate and deform synchronously. The position of the groove needs to be as close as possible to the expected wheel track of the vehicle. The optical fiber is connected to the phase-sensitive optical time domain reflectometer, and after the phase change of the scattered light is extracted by Hilbert transform, it is converted into vertical displacement to form a displacement time history curve. The spatial resolution of the device is 5m, i.e. the distance between feature points is 5m. By sampling the phase data of the optical fiber by the phase-sensitive optical time domain reflectometer, the displacement time history curve of each feature point can be obtained, which is integrated and averaged to compare with the corresponding calibrated damage expectation value to obtain the accurate road state.

[0081] Based on the same inventive concept, the embodiments of the present application also provide a distributed optical fiber based road maintenance scheme determination system, comprising:

[0082] An acquisition unit is configured to acquire, by a distributed optical fiber, a displacement time history curve of vertical displacement at a plurality of feature points of each target road in a target area; the distributed optical fiber is buried in the target road during construction of the target road;

[0083] A feature unit is configured to calculate a damage feature value of each feature point according to the displacement time history curve, and to obtain an damage value of the target road by averaging the damage feature value of each feature point; the feature points are uniformly arranged along the longitudinal direction of the target road;

[0084] A judgment unit is configured to judge that the target road corresponding to the damage value needs to be maintained when the damage value exceeds a damage expectation value.

[0085] In a possible implementation, the feature unit is further configured to:

[0086] According to the displacement time history curve, the displacement value is integrated with respect to time to calculate the damage feature value.

[0087] In a possible implementation, a first expectation unit is further configured to:

[0088] A road surface test piece of the target road corresponding to the target area is constructed; the experimental distributed optical fiber is arranged at the corresponding part of the road surface test piece;

[0089] A vertical dynamic load is applied to the top of the road surface test piece by a preset first load spectrum to cause the surface of the road surface test piece to crack, and an experimental displacement time history curve of the vertical displacement at the cracking point position is recorded by the experimental distributed optical fiber;

[0090] According to the experimental displacement time history curve, displacement values are integrated with respect to time to calculate the damage expectation value.

[0091] In a possible implementation, the method further includes a second expectation unit configured to:

[0092] constructing a finite element model of a target road corresponding to a target area;

[0093] loading a top of the finite element model by a second load spectrum with a unit time length, and obtaining a tensile strain time history curve of a road bottom in the finite element model and a sample displacement time history curve corresponding to a vertical displacement at the distributed optical fiber;

[0094] performing rainflow counting on the tensile strain time history curve to select a plurality of tensile strain maxima, and calculating a damage condition of the road in the unit time length as a tensile strain damage value according to a number of occurrences of each tensile strain maximum;

[0095] integrating displacement values with respect to time according to the sample displacement time history curve to form a displacement damage value in the unit time length;

[0096] calculating a cycle number when the target road needs to be maintained by the tensile strain damage value; the cycle number is a number of cycle unit time lengths;

[0097] multiplying the cycle number by the displacement damage value to form the damage expectation value.

[0098] In a possible implementation, the first expectation unit is further configured to:

[0099] obtaining a number of occurrences of each tensile strain maximum in the unit time length, and querying fatigue damage caused by each tensile strain maximum in the unit time length according to an ε-N curve;

[0100] summing up fatigue damages corresponding to each tensile strain maximum to form the tensile strain damage value.

[0101] Those skilled in the art can appreciate that the units and algorithm steps of the examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software or a combination of both. In order to clearly illustrate the interchangeability of hardware and software, the components and steps of the examples have been described in the above description in general terms. Whether the functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. A person skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0102] In several embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented by other manners. For example, the apparatus embodiments described above are merely illustrative, for example, the division of the units is merely a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, and can also be electrical, mechanical or other form of connection.

[0103] The units described as separate components can or can not be physically separated, and it is obvious to those skilled in the art that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized by electronic hardware, computer software or a combination of both. In order to clearly illustrate the interchangeability of hardware and software, the components and steps of each example have been described in the above description in general terms. Whether the functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. The skilled person can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0104] In addition, each functional unit in each embodiment of the present application can be integrated into one processing unit, or each unit can exist physically, or two or more units can be integrated into one unit. The integrated unit can be realized in the form of hardware or software functional unit.

[0105] When the integrated unit is realized in the form of software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the part that contributes to the prior art, or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a grid device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various media that can store program codes.

[0106] The above detailed description of the specific embodiments of the present application has been given to understand the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

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 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. The calculation of the expected damage value includes: constructing 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.

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: integrating the displacement value over time according to the displacement-time history curve to calculate the damage characteristic value.

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 tensile strain damage value includes: obtaining the number of occurrences of each maximum tensile strain value within a unit time period, and querying the fatigue damage caused by each maximum tensile strain value within the unit time period according to the ε-N curve; The tensile strain damage value is formed by summing the fatigue damage corresponding to each maximum tensile strain value.

4. 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; It also includes a second expected unit, configured to: construct a finite element model of the target road corresponding to the 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 road maintenance scheme determination system based on distributed optical fiber according to claim 4, characterized in that, The feature unit is further configured to: integrate the displacement value over time according to the displacement-time history curve to calculate the damage feature value.

6. The road maintenance scheme determination system based on distributed optical fiber according to claim 4, characterized in that, The second expected unit is further configured to: 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 according to 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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