Method and device for detecting road disease size based on ground penetrating radar

Abstract

The invention discloses a method and a device for detecting the size of a road disease based on a ground penetrating radar. The method comprises the following steps: respectively acquiring relative dielectric constants of a surface layer, a base layer and a roadbed material of a target road; calculating a dielectric influence factor of the disease based on the position of the disease in the target road detected by the ground penetrating radar, the relative dielectric constant, and the operation parameter and the structure parameter of the ground penetrating radar; calculating a first critical dimension and a second critical dimension of the disease according to the dielectric influence factor of the disease and the structural parameters of the ground penetrating radar; and determining the size relationship between the horizontal size of the disease and the first critical size and the second critical size according to the change relationship between the reflected wave electric field intensity of the ground penetrating radar electromagnetic wave and the horizontal size of the disease. The pavement disease size is reversely deduced based on the electric field intensity of the ground penetrating radar electromagnetic wave reflected wave, data support is provided for formulating a reasonable and effective road maintenance and repair scheme, the road disease repair efficiency is improved, and safety and smoothness of road traffic are ensured.

Description

Technical Field

[0001] This application relates to the technical field of road disease detection, and specifically relates to a method and device for detecting the size of road diseases based on ground penetrating radar. Background Art

[0002] As the infrastructure of the transportation system, the road structure mainly includes three structural layers from top to bottom: the surface layer, the base layer, and the subgrade. Among them, the surface layer and the base layer together constitute the pavement structure. Under the combined influence of long-term traffic loads and complex and variable environmental factors, various types of diseases such as cracks, looseness, and voids often occur inside the subgrade and pavement. The existence of these diseases not only seriously damages the durability and driving safety of the road, but also poses a potential threat to the smooth operation of road traffic.

[0003] To address these problems, it is particularly important to timely and accurately obtain the size information of road diseases. By precisely measuring the size of diseases, the severity of diseases and their impact on the structural safety of the road can be more scientifically evaluated, so as to formulate more reasonable and effective maintenance and repair plans.

[0004] Therefore, how to quickly detect the size of road diseases is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] This application provides a method and device for detecting the size of road diseases based on ground penetrating radar, which can quickly detect the size of road diseases based on ground penetrating radar and provide data support for formulating reasonable and effective road maintenance and repair plans.

[0006] In a first aspect, an embodiment of this application provides a method for detecting the size of road diseases based on ground penetrating radar. The method for detecting the size of road diseases based on ground penetrating radar includes: Obtain the relative dielectric constants of the surface layer, the base layer, and the subgrade materials of the target road respectively; Based on the position of the disease in the target road detected by the ground penetrating radar, the relative dielectric constant, the operating parameters and the structural parameters of the ground penetrating radar, calculate the dielectric influence factor of the disease; According to the dielectric influence factor of the disease and the structural parameters of the ground penetrating radar, calculate the first critical size and the second critical size of the disease; According to the relationship between the reflected wave electric field intensity of the ground penetrating radar electromagnetic wave and the horizontal size of the disease, determine the size relationship between the horizontal size of the disease and the first critical size and the second critical size.

[0007] In combination with the first aspect, in one embodiment, the operating parameters of the ground penetrating radar include the center frequency of the electromagnetic wave of the ground penetrating radar, and the structural parameters of the ground penetrating radar include the antenna distance between the transmitting antenna and the receiving antenna of the ground penetrating radar. Calculating the dielectric influence factor of the disease in the target road based on the position of the disease, the relative dielectric constant, the operating parameters and the structural parameters of the ground penetrating radar includes: If the disease is in the surface layer, calculate the dielectric influence factor of the surface layer disease according to the relative dielectric constant of the surface layer material, the center frequency, the antenna distance, the distance from the top of the disease to the upper surface of the surface layer, and the speed of light in vacuum:

[0008] Wherein, is the dielectric influence factor of the surface layer disease, is the relative dielectric constant of the surface layer material, is the center frequency, d is the antenna distance, is the distance from the top of the disease to the upper surface of the surface layer, is the speed of light in vacuum.

[0009] In one embodiment, calculating the dielectric influence factor of the disease in the target road based on the position of the disease, the relative dielectric constant, the operating parameters and the structural parameters of the ground penetrating radar further includes: If the disease is in the base layer, calculate the dielectric influence factor of the base layer disease according to the thickness of the surface layer, the relative dielectric constant of the base layer material, the relative dielectric constant of the surface layer material, the center frequency, the antenna distance, the distance from the top of the disease to the upper surface of the surface layer, and the speed of light in vacuum:

[0010] Wherein, is the dielectric influence factor of the base layer disease, is the thickness of the surface layer, is the relative dielectric constant of the base layer material.

[0011] In one embodiment, calculating the dielectric influence factor of the disease in the target road based on the position of the disease, the relative dielectric constant, the operating parameters and the structural parameters of the ground penetrating radar further includes: If the disease is in the subgrade, calculate the dielectric influence factor of the subgrade disease according to the thickness of the base course, the thickness of the surface course, the relative dielectric constant of the subgrade material, the relative dielectric constant of the base course material, the relative dielectric constant of the surface course material, the center frequency, the antenna distance, the distance from the top of the disease to the upper surface of the surface course, and the speed of light in vacuum:

[0012] Wherein, is the dielectric influence factor of the subgrade disease, is the thickness of the base course, is the relative dielectric constant of the subgrade material.

[0013] In one embodiment, calculate the first critical dimension of the disease according to the dielectric influence factor of the disease and the structural parameters of the ground penetrating radar, including: Calculate the first critical dimension according to the dielectric influence factor of the disease and the antenna distance of the ground penetrating radar:

[0014] Wherein, is the first critical dimension, is the dielectric influence factor of the disease, wherein ∈ , is the distance from the top of the disease to the upper surface of the surface course.

[0015] In one embodiment, calculate the second critical dimension of the disease according to the dielectric influence factor of the disease and the structural parameters of the ground penetrating radar, including: Calculate the second critical dimension according to the dielectric influence factor of the disease and the antenna distance of the ground penetrating radar:

[0016] Wherein, is the second critical dimension, is the dielectric influence factor of the disease, wherein ∈ , is the distance from the top of the disease to the upper surface of the surface course.

[0017] In one embodiment, determine the size relationship between the horizontal dimension of the disease and the first critical dimension and the second critical dimension according to the change relationship of the reflected wave electric field intensity of the ground penetrating radar electromagnetic wave with the horizontal dimension of the disease, including: If the horizontal dimension of the disease increases synchronously with the reflected wave electric field intensity, it is determined that the horizontal dimension of the disease is less than the first critical dimension; If, as the horizontal dimension of the disease increases, the reflected wave electric field strength decreases synchronously, it is determined that the horizontal dimension of the disease is greater than or equal to the first critical dimension and less than or equal to the second critical dimension; If, as the horizontal dimension of the disease increases, the reflected wave electric field strength remains unchanged, it is determined that the horizontal dimension of the disease is greater than the second critical dimension.

[0018] In one embodiment, the obtaining the relative dielectric constants of the surface layer, base layer and subgrade material of the target road respectively includes: Using the surface layer material to prepare a plurality of first type specimens, calculating the average value of the relative dielectric constants of the plurality of first type specimens, and obtaining the relative dielectric constant of the surface layer material; Using the base layer material to prepare a plurality of second type specimens, calculating the average value of the relative dielectric constants of the plurality of second type specimens, and obtaining the relative dielectric constant of the base layer material; Using the subgrade material to prepare a plurality of third type specimens, calculating the average value of the relative dielectric constants of the plurality of third type specimens, and obtaining the relative dielectric constant of the subgrade material.

[0019] In a second aspect, an embodiment of the present application provides a device for detecting the size of road diseases based on ground penetrating radar. The device for detecting the size of road diseases based on ground penetrating radar includes: An acquisition module, which is used to respectively acquire the relative dielectric constants of the surface layer, base layer and subgrade material of the target road; A first calculation module, which is used to calculate the dielectric influence factor of the disease based on the position of the disease in the target road detected by the ground penetrating radar, the relative dielectric constant, the operating parameters and structural parameters of the ground penetrating radar; A second calculation module, which is used to calculate the first critical dimension and the second critical dimension of the disease according to the dielectric influence factor of the disease and the structural parameters of the ground penetrating radar; A determination module, which is used to determine the size relationship between the horizontal dimension of the disease and the first critical dimension and the second critical dimension according to the change relationship of the reflected wave electric field strength of the ground penetrating radar electromagnetic wave with the horizontal dimension of the disease.

[0020] Combined with the second aspect, in one embodiment, the operating parameters of the ground penetrating radar include the center frequency of the ground penetrating radar electromagnetic wave, the structural parameters of the ground penetrating radar include the antenna distance between the transmitting antenna and the receiving antenna of the ground penetrating radar, and the first calculation module is further used for: If the disease is in the surface layer, calculating the dielectric influence factor of the surface layer disease according to the relative dielectric constant of the surface layer material, the center frequency, the antenna distance, the distance from the top of the disease to the upper surface of the surface layer and the speed of light in vacuum:

[0021] Among them, is the dielectric influence factor of the surface layer disease, is the relative dielectric constant of the surface layer material, is the center frequency, d is the antenna distance, is the distance from the top of the disease to the upper surface of the surface layer, is the speed of light in vacuum.

[0022] The beneficial effects brought by the technical solutions provided in the embodiments of the present application include: By separately obtaining the relative dielectric constants of the surface layer, base layer, and subgrade materials of the target road; calculating the dielectric influence factor of the disease based on the position of the disease in the target road detected by the ground penetrating radar, the relative dielectric constant, the operating parameters and structural parameters of the ground penetrating radar; calculating the first critical size and the second critical size of the disease according to the dielectric influence factor of the disease and the structural parameters of the ground penetrating radar; and determining the size relationship between the horizontal size of the disease and the first critical size and the second critical size according to the variation relationship between the reflected wave electric field intensity of the ground penetrating radar electromagnetic wave and the horizontal size of the disease. It realizes the inversion of the road surface disease size based on the electric field intensity of the reflected wave of the ground penetrating radar electromagnetic wave, provides data support for formulating reasonable and effective road maintenance and repair plans, thereby improving the repair efficiency of road diseases and ensuring the safety and smoothness of road traffic. Description of the Drawings

[0023] Figure 1 is a schematic flowchart of an embodiment of the method for detecting the size of road diseases based on a ground penetrating radar in the present application; Figure 2 is a top view of internal diseases of the subgrade and road surface in the present application; Figure 3 is a schematic diagram of the functional modules of an embodiment of the device for detecting the size of road diseases based on a ground penetrating radar in the present application. Detailed Embodiments

[0024] In order to enable those skilled in the art to better understand the solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0025] To make the purpose, technical solutions, and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0026] In a first aspect, an embodiment of the present application provides a method for detecting the size of road diseases based on ground penetrating radar.

[0027] In one embodiment, referring to Figure 1 , Figure 1 is a schematic flow chart of the first embodiment of the method for detecting the size of road diseases based on ground penetrating radar in the present application. As Figure 1 shown, the method for detecting the size of road diseases based on ground penetrating radar includes: Step S101: Obtain the relative dielectric constants of the surface layer, base layer, and subgrade material of the target road respectively.

[0028] Specifically, use the surface layer material to prepare a plurality of first-type specimens, calculate the average value of the relative dielectric constants of the plurality of first-type specimens, and obtain the relative dielectric constant of the surface layer material; use the base layer material to prepare a plurality of second-type specimens, calculate the average value of the relative dielectric constants of the plurality of second-type specimens, and obtain the relative dielectric constant of the base layer material; use the subgrade material to prepare a plurality of third-type specimens, calculate the average value of the relative dielectric constants of the plurality of third-type specimens, and obtain the relative dielectric constant of the subgrade material.

[0029] Exemplarily, use the asphalt mixture used in the surface layer to prepare a plurality of first-type specimens, use the cement stabilized macadam material used in the base layer to prepare a plurality of second-type specimens, and use the subgrade filler to prepare a plurality of third-type specimens. The number of the first-type specimens, the second-type specimens, and the third-type specimens is not less than 15. Then use a network analyzer to measure the relative dielectric constants of each specimen, and calculate the average value of the relative dielectric constants of the specimens of the same type, so as to obtain the relative dielectric constant of the surface layer material , the relative dielectric constant of the base layer material,

[0030] and the relative dielectric constant

[0031] of the subgrade material.

[0032] Among them, the ground penetrating radar emits electromagnetic waves towards the target road through the antenna. These electromagnetic waves propagate in the road medium. When the electromagnetic waves encounter the interface of different underground media, part of the electromagnetic waves will be reflected back. The receiving antenna of the ground penetrating radar captures these reflected signals, and the received reflected signals can be processed to generate a road structure image. Through image analysis, the location of the disease in the road can be determined.

[0033] In one embodiment, if the disease is in the surface layer, according to the relative dielectric constant of the surface layer material, the center frequency, the antenna distance, the distance from the top of the disease to the upper surface of the surface layer, and the speed of light in vacuum, calculate the dielectric influence factor of the surface layer disease:

[0034] Among them, is the dielectric influence factor of the surface layer disease, is the relative dielectric constant of the surface layer material, is the center frequency, d is the antenna distance, is the distance from the top of the disease to the upper surface of the surface layer, is the speed of light in vacuum.

[0035] In one embodiment, if the disease is in the base layer, according to the thickness of the surface layer, the relative dielectric constant of the base layer material, the relative dielectric constant of the surface layer material, the center frequency, the antenna distance, the distance from the top of the disease to the upper surface of the surface layer, and the speed of light in vacuum, calculate the dielectric influence factor of the base layer disease:

[0036] Among them, is the dielectric influence factor of the base layer disease, is the thickness of the surface layer, is the relative dielectric constant of the base layer material.

[0037] In one embodiment, if the disease is in the subgrade, according to the thickness of the base layer, the thickness of the surface layer, the relative dielectric constant of the subgrade material, the relative dielectric constant of the base layer material, the relative dielectric constant of the surface layer material, the center frequency, the antenna distance, the distance from the top of the disease to the upper surface of the surface layer, and the speed of light in vacuum, calculate the dielectric influence factor of the subgrade disease:

[0038] Among them, is the dielectric influence factor of the subgrade disease, is the thickness of the base layer, is the relative dielectric constant of the subgrade material.

[0039] Step S103: Calculate the first critical size and the second critical size of the disease according to the dielectric influence factor of the disease and the structural parameters of the ground penetrating radar.

[0040] In one embodiment, calculate the first critical size according to the dielectric influence factor of the disease and the antenna distance of the ground penetrating radar:

[0041] Wherein, is the first critical size, is the dielectric influence factor of the disease, where ∈ , is the distance from the top of the disease to the upper surface of the surface layer. That is, when calculating the first critical size of the disease in the surface layer, is , when calculating the first critical size of the disease in the base course, is , when calculating the first critical size of the disease in the subgrade, is .

[0042] In one embodiment, calculate the second critical size according to the dielectric influence factor of the disease and the antenna distance of the ground penetrating radar:

[0043] Wherein, is the second critical size, is the dielectric influence factor of the disease, where ∈ , is the distance from the top of the disease to the upper surface of the surface layer. That is, when calculating the first critical size of the disease in the surface layer, is , when calculating the first critical size of the disease in the base course, is , when calculating the first critical size of the disease in the subgrade, is .

[0044] Step S104: Determine the size relationship between the horizontal size of the disease and the first critical size and the second critical size according to the change relationship of the reflected wave electric field intensity of the ground penetrating radar electromagnetic wave with the horizontal size of the disease.

[0045] Specifically, if the horizontal dimension of the disease increases synchronously with the reflected wave electric field intensity, it is determined that the horizontal dimension of the disease is less than the first critical dimension; if the reflected wave electric field intensity decreases synchronously as the horizontal dimension of the disease increases, it is determined that the horizontal dimension of the disease is greater than or equal to the first critical dimension and less than or equal to the second critical dimension; if the reflected wave electric field intensity remains unchanged as the horizontal dimension of the disease increases, it is determined that the horizontal dimension of the disease is greater than the second critical dimension.

[0046] Explanatory, as Figure 2 shown, when the ground penetrating radar advances along the forward direction line, if there is a disease in the road, the horizontal dimension of the disease scanned will increase as the radar advances, and at the same time, the receiving antenna of the ground penetrating radar can obtain the reflected wave electric field intensity of the electromagnetic wave of the ground penetrating radar. When the horizontal dimension of the disease is less than the first critical dimension, the disease is within the range where the electromagnetic wave can be effectively reflected. Within this range, as the horizontal dimension of the scanned disease increases, it will directly lead to an increase in the reflection area of the disease, thereby enhancing the electric field intensity of the reflected wave. When the horizontal dimension of the disease increases to the range between the first critical dimension and the second critical dimension, the increase in the disease size may cause the interference effect of the reflected wave, and part of the reflected waves cancel each other out, thereby weakening the electric field intensity of the total reflected wave, resulting in the synchronous decrease of the reflected wave electric field intensity as the horizontal dimension of the disease increases. When the horizontal dimension of the disease increases to be greater than the second critical dimension, the disease can form a stable reflection waveform, so the further increase in the disease size has a very weak impact on the reflected wave electric field intensity, and the situation where the reflected wave electric field intensity remains unchanged as the horizontal dimension of the disease increases will occur.

[0047] Therefore, based on the following principle, when the horizontal dimension of the internal disease of the surface layer, base layer or subgrade along the forward direction of the ground penetrating radar satisfies when, as increases, the electric field intensity of the reflected wave at the top of the disease increases accordingly; when it satisfies when, as increases, the electric field intensity of the reflected wave at the top of the disease decreases accordingly; when it satisfies when, as increases, the electric field intensity of the reflected wave at the top of the disease remains unchanged. According to the variation relationship between the reflected wave electric field intensity of the ground penetrating radar electromagnetic wave and the horizontal dimension of the disease, the size relationship between the horizontal dimension of the disease and the first critical dimension and the second critical dimension can be determined, thereby determining the size range of the horizontal dimension of the disease.

[0048] In a specific Embodiment 1, for a certain asphalt pavement structure, the surface layer is 18 cm thick, and the average dielectric constant , the base layer is 40 cm thick, and the average dielectric constant , Subgrade dielectric constant , In a certain disease in the surface layer, the buried depth is 6 cm, the distance between the transmitting and receiving antennas of the ground penetrating radar is 5 cm, and the frequency of the electromagnetic wave emitted by the ground penetrating radar is 200 MHz. Through the above method, the dielectric influence factor of the surface layer disease is calculated as , The first critical dimension 7.00 cm, the second critical dimension 20.01 cm. Therefore, when the horizontal dimension of the internal disease in this surface layer along the advancing direction of the ground penetrating radar is less than 7.00 cm, as increases, the electric field strength of the reflected wave at the top of the disease increases; when is between 7.00 cm and 20.01 cm, as increases, the electric field strength of the reflected wave at the top of the disease decreases; when is greater than 20.01 cm, as increases, the electric field strength of the reflected wave at the top of the disease remains unchanged.

[0049] In the specific second embodiment, for a certain asphalt pavement structure, the surface layer is 18 cm thick, and the average dielectric constant , the base layer is 40 cm thick, and the average dielectric constant , the subgrade dielectric constant , in a certain disease in the surface layer, the buried depth is 7 cm, the distance between the transmitting and receiving antennas of the ground penetrating radar is 5 cm, and the frequency of the electromagnetic wave emitted by the ground penetrating radar is 500 MHz. Through the above method, the dielectric influence factor of the surface layer disease is calculated as , the first critical dimension has no solution (the value inside the square root is negative), the second critical dimension 8.15 cm. Therefore, when the horizontal dimension of the internal disease in this surface layer along the advancing direction of the ground penetrating radar is less than 8.15 cm, as increases, the electric field strength of the reflected wave at the top of the disease decreases; when is greater than 8.15 cm, as increases, the electric field strength of the reflected wave at the top of the disease remains unchanged.

[0050] In the specific third embodiment, for a certain asphalt pavement structure, the surface layer is 18 cm thick, and the average dielectric constant , the base layer is 40 cm thick, and the average dielectric constant , the subgrade dielectric constant , in a certain disease in the base layer, the buried depth is 25 cm, the distance between the transmitting and receiving antennas of the ground penetrating radar is 5 cm, and the frequency of the electromagnetic wave emitted by the ground penetrating radar is 200 MHz. Through the above method, the dielectric influence factor of the base layer disease is calculated as , the first critical dimension 3.88 cm, the second critical dimension 12.82 cm. Therefore, when the horizontal dimension of the internal disease in this surface layer along the advancing direction of the ground penetrating radar is less than 3.88 cm, as increases, the electric field strength of the reflected wave at the top of the disease increases accordingly; when is between 3.88 cm and 12.82 cm, as increases, the electric field strength of the reflected wave at the top of the disease decreases accordingly; when is greater than 12.82 cm, as increases, the electric field strength of the reflected wave at the top of the disease remains unchanged.

[0051] In a specific embodiment 4, for a certain asphalt pavement structure, the surface layer is 18 cm thick, and the average dielectric constant , the base layer is 40 cm thick, and the average dielectric constant , the dielectric constant of the subgrade , the burial depth of a certain disease in the subgrade is 7 cm, the distance between the transmitting and receiving antennas of the ground penetrating radar is 5 cm, and the frequency of the electromagnetic wave emitted by the ground penetrating radar is 100 MHz. Through the above method, it is calculated that the dielectric influence factor of the subgrade disease , the first critical dimension has no solution (the value inside the square root is negative), and the second critical dimension is 13.98 cm. Therefore, when the horizontal dimension of the internal disease in this surface layer along the advancing direction of the ground penetrating radar is less than 13.98 cm, as increases, the electric field strength of the reflected wave at the top of the disease decreases accordingly; when is greater than 13.98 cm, as increases, the electric field strength of the reflected wave at the top of the disease remains unchanged.

[0052] The method for detecting the size of road diseases based on ground penetrating radar provided by the present invention calculates the first critical dimension and the second critical dimension of the internal diseases in the road surface layer, base layer, and subgrade, and accordingly gives the relationship between the electric field strength of the electromagnetic reflection wave at the top of the internal diseases in the roadbed and pavement and the horizontal dimension of the diseases along the advancing direction of the ground penetrating radar, which can provide a reference for inverting the size of the diseases in the roadbed and pavement based on the electric field strength of the reflected wave of the ground penetrating radar, so as to realize providing data support for formulating a reasonable and effective road maintenance and repair plan, thereby improving the repair efficiency of road diseases and ensuring the safety and smoothness of road traffic.

[0053] In the second aspect, the embodiments of the present application also provide a device for detecting the size of road diseases based on ground penetrating radar.

[0054] In one embodiment, referring to Figure 3 , Figure 3This is a schematic diagram of the functional modules of an embodiment of the device for detecting the size of road diseases based on ground penetrating radar. As Figure 3 shown, the device for detecting the size of road diseases based on ground penetrating radar includes: An acquisition module, which is used to acquire the relative dielectric constants of the surface layer, base layer, and subgrade material of the target road respectively; A first calculation module, which is used to calculate the dielectric influence factor of the disease based on the position of the disease in the target road detected by the ground penetrating radar, the relative dielectric constant, the operating parameters and structural parameters of the ground penetrating radar; A second calculation module, which is used to calculate the first critical size and the second critical size of the disease according to the dielectric influence factor of the disease and the structural parameters of the ground penetrating radar; A determination module, which is used to determine the size relationship between the horizontal size of the disease and the first critical size and the second critical size according to the change relationship between the reflected wave electric field intensity of the ground penetrating radar electromagnetic wave and the horizontal size of the disease.

[0055] Further, in an embodiment, the operating parameters of the ground penetrating radar include the center frequency of the ground penetrating radar electromagnetic wave, the structural parameters of the ground penetrating radar include the antenna distance between the transmitting antenna and the receiving antenna of the ground penetrating radar, and the first calculation module is further used for: If the disease is in the surface layer, calculate the dielectric influence factor of the surface layer disease according to the relative dielectric constant of the surface layer material, the center frequency, the antenna distance, the distance from the top of the disease to the upper surface of the surface layer, and the speed of light in vacuum:

[0056] Wherein, is the dielectric influence factor of the surface layer disease, is the relative dielectric constant of the surface layer material, is the center frequency, d is the antenna distance, is the distance from the top of the disease to the upper surface of the surface layer, is the speed of light in vacuum. Further, in an embodiment, the first calculation module is further used for: If the disease is in the base layer, calculate the dielectric influence factor of the base layer disease according to the thickness of the surface layer, the relative dielectric constant of the base layer material, the relative dielectric constant of the surface layer material, the center frequency, the antenna distance, the distance from the top of the disease to the upper surface of the surface layer, and the speed of light in vacuum:

[0057] Wherein, is the dielectric influence factor of the base layer disease, is the thickness of the surface layer, is the relative permittivity of the base material.

[0058] Further, in one embodiment, the first calculation module is further configured to: If the disease is in the roadbed, then according to the thickness of the base layer, the thickness of the surface layer, the relative permittivity of the roadbed material, the relative permittivity of the base material, the relative permittivity of the surface layer material, the center frequency, the antenna distance, the distance from the top of the disease to the upper surface of the surface layer, and the speed of light in vacuum, calculate the dielectric influence factor of the roadbed disease:

[0059] Wherein, is the dielectric influence factor of the roadbed disease, is the thickness of the base layer, is the relative permittivity of the roadbed material.

[0060] Further, in one embodiment, the second calculation module is further configured to: Calculate the first critical dimension according to the dielectric influence factor of the disease and the antenna distance of the ground penetrating radar:

[0061] Wherein, is the first critical dimension, is the dielectric influence factor of the disease, where ∈ , is the distance from the top of the disease to the upper surface of the surface layer.

[0062] Further, in one embodiment, the second calculation module is further configured to: Calculate the second critical dimension according to the dielectric influence factor of the disease and the antenna distance of the ground penetrating radar:

[0063] Wherein, is the second critical dimension, is the dielectric influence factor of the disease, where ∈ , is the distance from the top of the disease to the upper surface of the surface layer.

[0064] Further, in one embodiment, the determination module is further configured to: According to the variation relationship between the electric field intensity of the reflected wave of the ground penetrating radar electromagnetic wave and the horizontal size of the disease, determining the size relationship between the horizontal size of the disease and the first critical size and the second critical size includes: If the horizontal size of the disease increases synchronously with the electric field intensity of the reflected wave, it is determined that the horizontal size of the disease is smaller than the first critical size; If the electric field intensity of the reflected wave decreases synchronously as the horizontal size of the disease increases, it is determined that the horizontal size of the disease is greater than or equal to the first critical size and less than or equal to the second critical size; If the electric field intensity of the reflected wave remains unchanged as the horizontal size of the disease increases, it is determined that the horizontal size of the disease is greater than the second critical size.

[0065] Further, in an embodiment, the obtaining module is further configured to: Prepare a plurality of first-type specimens using the surface layer material, calculate the average relative dielectric constant of the plurality of first-type specimens, and obtain the relative dielectric constant of the surface layer material; Prepare a plurality of second-type specimens using the base layer material, calculate the average relative dielectric constant of the plurality of second-type specimens, and obtain the relative dielectric constant of the base layer material; Prepare a plurality of third-type specimens using the subgrade material, calculate the average relative dielectric constant of the plurality of third-type specimens, and obtain the relative dielectric constant of the subgrade material.

[0066] Wherein, the function implementation of each module in the above device for detecting the size of road diseases based on ground penetrating radar corresponds to each step in the above method embodiment for detecting the size of road diseases based on ground penetrating radar, and its function and implementation process will not be elaborated here one by one.

[0067] It should be noted that the serial numbers of the above embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments.

[0068] The terms "including" and "having" and any variations thereof in the specification, claims and drawings of the present application are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices. The descriptions of terms such as "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit that "first", "second" and "third" are different types.

[0069] In the description of the embodiments of this application, words such as "exemplary", "for example", or "for illustration" are used to indicate examples, illustrations, or explanations. Any embodiment or design solution described as "exemplary", "for example", or "for illustration" in the embodiments of this application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary", "for example", or "for illustration" is intended to present the relevant concepts in a specific manner.

[0070] In the description of the embodiments of this application, unless otherwise specified, " / " means "or". For example, A / B can mean A or B; "and / or" in the text is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of this application, "a plurality of" means two or more than two.

[0071] In some processes described in the embodiments of this application, a plurality of operations or steps appear in a specific order. However, it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of this application or may be executed in parallel. The serial numbers of the operations are only used to distinguish different operations, and the serial numbers themselves do not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed in sequence or in parallel, and these operations or steps may be combined.

[0072] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium as described above (such as ROM / RAM, magnetic disk, optical disc) and includes several instructions to enable a terminal device to execute the methods described in the various embodiments of this application.

[0073] The above are only the preferred embodiments of this application, and do not limit the patent scope of this application accordingly. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of this application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of this application.

Claims

1. A method for detecting the size of road damage based on ground penetrating radar, characterized in that: The method for detecting the size of road damage based on ground penetrating radar comprises: Obtain the relative dielectric constants of the surface layer, base layer and roadbed materials of the target road respectively; Calculate the dielectric influence factor of the defect based on the location of the defect in the target road detected by the ground penetrating radar, the relative dielectric constant, and the operating parameters and structural parameters of the ground penetrating radar; Calculating a first critical size and a second critical size of the defect according to a dielectric influence factor of the defect and a structural parameter of the ground penetrating radar; According to the relationship between the electric field intensity of the reflected wave of the ground penetrating radar electromagnetic wave and the horizontal size of the defect, the size relationship between the horizontal size of the defect and the first critical size and the second critical size is determined.

2. The method for detecting the size of road damage based on ground penetrating radar according to claim 1, characterized in that: The operating parameters of the ground penetrating radar include the center frequency of the electromagnetic wave of the ground penetrating radar, the structural parameters of the ground penetrating radar include the antenna distance between the transmitting antenna and the receiving antenna of the ground penetrating radar, and the dielectric influence factor of the defect is calculated based on the location of the defect in the target road detected by the ground penetrating radar, the relative dielectric constant, the operating parameters and the structural parameters of the ground penetrating radar, including: If the defect is in the surface layer, the dielectric influence factor of the surface layer defect is calculated according to the relative dielectric constant of the surface layer material, the center frequency, the antenna distance, the distance from the top of the defect to the upper surface of the surface layer and the speed of light in vacuum: in, is the dielectric influencing factor of the surface layer disease, is the relative dielectric constant of the surface layer material, is the center frequency, d is the antenna distance, is the distance from the top of the disease to the upper surface of the surface layer, is the speed of light in a vacuum.

3. The method for detecting the size of road damage based on ground penetrating radar as claimed in claim 2, characterized in that: Calculating the dielectric influence factor of the defect based on the location of the defect in the target road detected by the ground penetrating radar, the relative dielectric constant, and the operating parameters and structural parameters of the ground penetrating radar, further comprising: If the defect is in the base layer, the dielectric influence factor of the base layer defect is calculated based on the thickness of the surface layer, the relative dielectric constant of the base layer material, the relative dielectric constant of the surface layer material, the center frequency, the antenna distance, the distance from the top of the defect to the upper surface of the surface layer and the speed of light in vacuum: in, is the dielectric influence factor of the base layer disease, is the thickness of the surface layer, is the relative dielectric constant of the base material.

4. The method for detecting the size of road damage based on ground penetrating radar as claimed in claim 3, characterized in that: The step of calculating the dielectric influence factor of the defect based on the location of the defect in the target road detected by the ground penetrating radar, the relative dielectric constant, and the operating parameters and structural parameters of the ground penetrating radar further includes: If the defect is on the roadbed, the dielectric influence factor of the roadbed defect is calculated based on the thickness of the base layer, the thickness of the surface layer, the relative dielectric constant of the roadbed material, the relative dielectric constant of the base layer material, the relative dielectric constant of the surface layer material, the center frequency, the antenna distance, the distance from the top of the defect to the upper surface of the surface layer and the vacuum light speed: in, is the dielectric influencing factor of the roadbed disease, is the thickness of the base layer, is the relative dielectric constant of the roadbed material.

5. The method for detecting the size of road damage based on ground penetrating radar according to any one of claim 4, characterized in that: Calculating a first critical size of the defect according to the dielectric influence factor of the defect and the structural parameters of the ground penetrating radar includes: The first critical size is calculated according to the dielectric impact factor of the disease and the antenna distance of the ground penetrating radar: in, is the first critical dimension, is the dielectric influence factor of the disease, where ∈ , It is the distance from the top of the disease to the upper surface of the surface layer.

6. The method for detecting the size of road damage based on ground penetrating radar according to any one of claim 4, characterized in that: Calculating a second critical size of the defect according to the dielectric influence factor of the defect and the structural parameters of the ground penetrating radar includes: The second critical size is calculated according to the dielectric impact factor of the disease and the antenna distance of the ground penetrating radar: in, is the second critical dimension, is the dielectric influence factor of the disease, where ∈ , It is the distance from the top of the disease to the upper surface of the surface layer.

7. The method for detecting the size of road damage based on ground penetrating radar as claimed in claim 1, characterized in that: Determining the relationship between the horizontal size of the defect and the first critical size and the second critical size according to the relationship between the electric field intensity of the reflected wave of the ground penetrating radar electromagnetic wave and the horizontal size of the defect includes: If the horizontal size of the defect increases synchronously with the electric field intensity of the reflected wave, it is determined that the horizontal size of the defect is smaller than the first critical size; If the electric field intensity of the reflected wave decreases synchronously with the increase in the horizontal size of the defect, it is determined that the horizontal size of the defect is greater than or equal to the first critical size and less than or equal to the second critical size; If the electric field intensity of the reflected wave remains unchanged as the horizontal size of the defect increases, it is determined that the horizontal size of the defect is greater than the second critical size.

8. The method for detecting the size of road damage based on ground penetrating radar as claimed in claim 1, characterized in that: The step of respectively obtaining the relative dielectric constants of the surface layer, base layer and roadbed materials of the target road comprises: Using the surface layer material to prepare a plurality of first-type test pieces, calculating an average relative dielectric constant of the plurality of first-type test pieces, and obtaining a relative dielectric constant of the surface layer material; Using the base material to prepare a plurality of second-type test pieces, calculating an average relative dielectric constant of the plurality of second-type test pieces, and obtaining a relative dielectric constant of the base material; A plurality of third-type test pieces are prepared using the roadbed material, and an average relative dielectric constant of the plurality of third-type test pieces is calculated to obtain the relative dielectric constant of the roadbed material.

9. A device for detecting the size of road damage based on ground penetrating radar, characterized in that: The device for detecting the size of road damage based on ground penetrating radar comprises: An acquisition module, which is used to respectively acquire the relative dielectric constants of the surface layer, base layer and roadbed materials of the target road; A first calculation module, which is used to calculate the dielectric influence factor of the disease based on the location of the disease in the target road detected by the ground penetrating radar, the relative dielectric constant, and the operating parameters and structural parameters of the ground penetrating radar; A second calculation module, which is used to calculate a first critical size and a second critical size of the defect according to a dielectric influence factor of the defect and a structural parameter of the ground penetrating radar; A determination module is used to determine the size relationship between the horizontal size of the defect and the first critical size and the second critical size according to the relationship between the electric field intensity of the reflected wave of the ground penetrating radar electromagnetic wave and the horizontal size of the defect.

10. The method for detecting the size of road damage based on ground penetrating radar as claimed in claim 9, characterized in that: The operating parameters of the ground penetrating radar include the center frequency of the electromagnetic wave of the ground penetrating radar, the structural parameters of the ground penetrating radar include the antenna distance between the transmitting antenna and the receiving antenna of the ground penetrating radar, and the first calculation module is further used for: If the defect is in the surface layer, the dielectric influence factor of the surface layer defect is calculated according to the relative dielectric constant of the surface layer material, the center frequency, the antenna distance, the distance from the top of the defect to the upper surface of the surface layer and the speed of light in vacuum: in, is the dielectric influencing factor of the surface layer disease, is the relative dielectric constant of the surface layer material, is the center frequency, d is the antenna distance, is the distance from the top of the disease to the upper surface of the surface layer, is the speed of light in a vacuum.

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