Nondestructive testing method and device for existing bridge foundation pile

Abstract

The invention relates to a nondestructive testing method and device for an existing bridge foundation pile, and belongs to the technical field of bridge detection.The nondestructive testing method for the existing bridge foundation pile comprises the steps that a foundation pile speed model is built based on the propagation characteristics of sound waves in a target foundation pile and the density of the target foundation pile; performing forward modeling based on the foundation pile speed model by taking a Ricker wavelet as a seismic source to determine a forward wave field, and performing inversion based on the foundation pile speed model by taking a pile side sound wave record as a seismic source to determine a reverse wave field; performing wave field separation on the forward wave field and the reverse wave field, and determining a wave field component of the foundation pile speed model; and determining a three-dimensional structure of the target foundation pile based on the wave field component of the foundation pile speed model, and detecting the target foundation pile based on the three-dimensional structure. The whole detection process is not influenced by the upper structure of the foundation pile, and the detection process is convenient and fast, so that the cost of nondestructive detection of the foundation pile is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge detection, and in particular to a non-destructive detection method and device for existing bridge foundation piles. Background Art

[0002] With the acceleration of urbanization, highway bridges, railway bridges, and cross-river bridges are also being actively built. The average annual number of bridge foundation piles in my country exceeds 1 million. During the use of foundation piles, due to the influence of water erosion, earthquakes, vehicle overload or collision, the foundation piles are prone to problems such as steel bar leakage, breakage, diameter shrinkage, and diameter expansion. Moreover, these damages may continue to develop, causing damage to the bridge and seriously threatening the safety of bridge components.

[0003] The top of the existing highway piles is a non-free end (there are structures), and its inspection work is usually carried out when the building already exists. Due to the influence of the superstructure, the traditional pile integrity inspection method is no longer applicable to the non-destructive inspection of the integrity of such piles. At present, there are not many effective means for non-destructive inspection of the lower piles in bridge inspection, mainly including the acoustic wave transmission method, low strain method, side hole seismic wave method, cross hole elastic wave computed tomography (CT) method, etc.

[0004] The existing means of non-destructive testing of the foundation piles under the bridge are either not applicable to the foundation piles with superstructures or the testing cost is high. Therefore, how to perform non-destructive testing on the foundation piles with superstructures at a lower cost has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] In view of this, it is necessary to provide a method and device for non-destructive testing of existing bridge foundation piles to solve the problem of high cost of existing non-destructive testing solutions for foundation piles with superstructures.

[0006] In order to solve the above problems, the present invention provides a non-destructive testing method for existing bridge foundation piles, comprising: Constructing a pile velocity model based on the propagation characteristics of the sound waves in the target piles and the density of the target piles; Taking the Ricker wavelet as the seismic source, forward modeling is performed based on the pile velocity model to determine the forward wave field, and taking the pile side acoustic wave record as the seismic source, inversion is performed based on the pile velocity model to determine the reverse wave field; Performing wave field separation on the forward wave field and the reverse wave field to determine the wave field components of the pile velocity model; The three-dimensional structure of the target pile is determined based on the wave field component of the pile velocity model, and the target pile is detected based on the three-dimensional structure.

[0007] In a possible implementation, constructing a pile velocity model based on the propagation characteristics of the sound waves in the target piles and the density of the target piles includes: A pile velocity model is constructed based on the longitudinal wave velocity of the sound wave in the target pile, the horizontal vibration velocity and the vertical vibration velocity of the mass point in the target pile and the density of the target pile.

[0008] In a possible implementation, the method of taking the Ricker wavelet as the seismic source and performing forward modeling based on the pile velocity model to determine the forward wave field includes: Taking the Ricker wavelet as the earthquake source, forward modeling is performed based on the staggered grid finite difference algorithm and the pile velocity model to determine the forward wave field.

[0009] In a possible implementation, the method of using the acoustic wave recording on the pile side as the seismic source and performing inversion based on the pile velocity model to determine the reverse wave field includes: Taking the acoustic wave record on the pile side as the seismic source, inversion is performed based on the staggered grid finite difference algorithm and the pile velocity model to determine the reverse wave field.

[0010] In a possible implementation, performing wavefield separation on the forward wavefield and the reverse wavefield to determine the wavefield components of the pile velocity model includes: Based on Hilbert transform, the forward wave field is converted into a first wave field, and the reverse wave field is converted into a second wave field; Performing Fourier transformation and time-wavenumber domain decomposition on the first wave field to obtain a third wave field; Performing Fourier transformation and time-wavenumber domain decomposition on the second wave field to obtain a fourth wave field; Perform inverse Fourier transform on the third wave field and the fourth wave field to obtain wave field components of the pile velocity model in the time-space domain.

[0011] In a possible implementation, determining the three-dimensional structure of the target pile based on the wave field component of the pile velocity model includes: The wave field component of the pile velocity model is integrated in the time domain to obtain the three-dimensional structure of the target pile.

[0012] In a possible implementation, the Ricker wavelet and the pile side acoustic wave record have the same source position, and the pile side acoustic wave record is obtained by detecting acoustic waves after acoustic wave excitation on a pier corresponding to the target foundation pile.

[0013] The present invention also provides a non-destructive testing device for existing bridge foundation piles, comprising: A construction module, used to construct a pile velocity model based on the propagation characteristics of the sound wave in the target pile and the density of the target pile; The first determination module is used to use the Ricker wavelet as the seismic source, perform forward modeling based on the pile velocity model to determine the forward wave field, and use the pile side acoustic wave record as the seismic source, perform inversion based on the pile velocity model to determine the reverse wave field; A second determination module is used to perform wave field separation on the forward wave field and the reverse wave field to determine the wave field components of the pile velocity model; A detection module is used to determine the three-dimensional structure of the target pile based on the wave field component of the pile velocity model, and detect the target pile based on the three-dimensional structure.

[0014] The present invention also provides an electronic device, including a memory and a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the nondestructive testing method for existing bridge foundation piles as described above is implemented.

[0015] The present invention also provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the non-destructive testing method for existing bridge foundation piles as described above is implemented.

[0016] The beneficial effects of the present invention are as follows: the nondestructive testing method and device for existing bridge foundation piles provided by the present invention construct a foundation pile velocity model corresponding to the target foundation pile, then obtain the forward wave field and reverse wave field of the foundation pile velocity model through forward modeling and inversion, and finally obtain the wave field components of the foundation pile velocity model through wave field separation, thereby constructing a three-dimensional structure of the target foundation pile for the detection of the target foundation pile. The entire detection process is not affected by the foundation pile superstructure, and the detection process is convenient and fast, thereby effectively reducing the cost of nondestructive testing of the foundation piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of a flow chart of an embodiment of a nondestructive testing method for existing bridge foundation piles provided by the present invention; Figure 2 A schematic diagram of a flow chart of an embodiment of an existing bridge foundation pile detection process provided by the present invention; Figure 3 A schematic diagram of an embodiment of a pile side acoustic wave recording and collection scenario provided by the present invention; Figure 4 A schematic structural diagram of an embodiment of a nondestructive testing device for existing bridge foundation piles provided by the present invention; Figure 5 A schematic structural diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0019] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0020] In the description of the present invention, reference to an "embodiment" means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the described embodiments may be combined with other embodiments.

[0021] With the acceleration of urbanization, highway bridges, railway bridges, and cross-river bridges are also being actively built. The average annual number of bridge foundation piles in my country exceeds 1 million. During the use of foundation piles, due to the influence of water erosion, earthquakes, vehicle overload or collision, the foundation piles are prone to problems such as steel bar leakage, breakage, diameter shrinkage, and diameter expansion. Moreover, these damages may continue to develop, causing damage to the bridge and seriously threatening the safety of bridge components.

[0022] The top of the existing highway piles is a non-free end (there are structures), and its inspection work is usually carried out when the building already exists. Due to the influence of the superstructure, the traditional pile integrity inspection method is no longer applicable to the non-destructive inspection of the integrity of such piles. At present, there are not many effective means for non-destructive inspection of the lower piles in bridge inspection, mainly including the acoustic wave transmission method, low strain method, side hole seismic wave method, cross hole elastic wave CT method, etc.

[0023] Existing methods for non-destructive testing of bridge piles are either not suitable for piles with superstructures or have high testing costs.

[0024] In order to solve the above problems, the present invention provides a non-destructive testing method for existing bridge foundation piles.

[0025] The specific embodiments are described in detail below: A specific embodiment of the present invention discloses a non-destructive testing method for existing bridge foundation piles, combining Figure 1 Come and see, Figure 1The flowchart of an embodiment of the nondestructive testing method for existing bridge foundation piles provided by the present invention includes steps S101 to S104, wherein: In step S101, a pile velocity model is constructed based on the propagation characteristics of the sound wave in the target pile and the density of the target pile; In step S102, forward modeling is performed based on the pile velocity model with the Ricker wavelet as the seismic source to determine the forward wave field, and inversion is performed based on the pile velocity model with the pile side acoustic wave record as the seismic source to determine the reverse wave field; In step S103, wavefield separation is performed on the forward wavefield and the reverse wavefield to determine the wavefield components of the pile velocity model; In step S104, the three-dimensional structure of the target pile is determined based on the wave field component of the pile velocity model, and the target pile is detected based on the three-dimensional structure.

[0026] During implementation, the physical properties of the target piles can be determined first, and then the propagation characteristics of the sound waves in the target piles and the density of the target piles can be determined. Subsequently, a pile velocity model can be constructed based on the propagation characteristics of the sound waves in the target piles and the density of the target piles. The pile velocity model can be used to feedback the propagation law of the sound waves in the target piles.

[0027] Then, the Ricker wavelet can be used as the source, and the forward wave field can be determined by forward modeling through the pile velocity model. At the same time, the pile side acoustic wave record can be used as the source, and the reverse wave field can be determined by inversion through the pile velocity model. The pile side acoustic wave record can be the record obtained by detection after acoustic wave excitation on the target pile.

[0028] Then, the forward wave field and the reverse wave field can be separated to determine the wave field components of the pile velocity model. Then, the three-dimensional structure of the target pile can be constructed based on the wave field components of the pile velocity model, and non-destructive testing can be achieved through the three-dimensional structure of the target pile.

[0029] The nondestructive testing method for existing bridge foundation piles provided by the present invention can be applied to the nondestructive testing scenario of existing highway bridge foundation piles, and can also be applied to the nondestructive testing of other types of bridge foundation piles, and the present invention does not make specific limitations on this.

[0030] Compared with the prior art, the nondestructive testing method for existing bridge piles provided in this embodiment constructs a pile velocity model corresponding to the target pile, then obtains the forward wave field and reverse wave field of the pile velocity model through forward modeling and inversion, and finally obtains the wave field components of the pile velocity model through wave field separation, thereby constructing a three-dimensional structure of the target pile for the detection of the target pile. The entire detection process is not affected by the pile superstructure, and the detection process is convenient and fast, thereby effectively reducing the cost of nondestructive testing of piles.

[0031] Exemplarily, the constructing of the pile velocity model based on the propagation characteristics of the sound waves in the target piles and the density of the target piles includes: A pile velocity model is constructed based on the longitudinal wave velocity of the sound wave in the target pile, the horizontal vibration velocity and the vertical vibration velocity of the mass point in the target pile and the density of the target pile.

[0032] Specifically, when constructing a pile velocity model based on the propagation characteristics of sound waves in the target piles and the density of the target piles, the pile velocity model can be constructed based on the longitudinal wave velocity of the sound waves in the target piles, the horizontal vibration velocity and vertical vibration velocity of the particles in the target piles, and the density of the target piles.

[0033] For example, the pile velocity model can be constructed by the following formula:

[0034] in, represents the stress wave field, represents the propagation time, represents the density of the target pile, represents the longitudinal wave velocity of the sound wave in the target pile, represents the horizontal vibration velocity of the mass point in the target pile, represents the vertical vibration velocity of the mass point in the target pile, Indicates the horizontal direction, Indicates the vertical direction.

[0035] Exemplarily, the method of taking the Ricker wavelet as the seismic source and performing forward modeling based on the pile velocity model to determine the forward wave field includes: Taking the Ricker wavelet as the earthquake source, forward modeling is performed based on the staggered grid finite difference algorithm and the pile velocity model to determine the forward wave field.

[0036] Specifically, when the Ricker wavelet is used as the earthquake source and the forward wave field is determined by forward modeling through the pile velocity model, the forward wave field can be determined by forward modeling through the staggered grid finite difference algorithm and the pile velocity model.

[0037] For example, the forward modeling can be performed using the following formula:

[0038]

[0039]

[0040]

[0041] in, represents the Ricker wavelet, represents the wavelet frequency, represents the spatial step length in the horizontal direction, represents the spatial step length in the vertical direction, represents the time step, is the difference order, is the time discrete sequence number, is the difference coefficient.

[0042] Exemplarily, the method of using the acoustic wave recording on the pile side as the earthquake source and performing inversion based on the pile velocity model to determine the reverse wave field includes: Taking the acoustic wave record on the pile side as the seismic source, inversion is performed based on the staggered grid finite difference algorithm and the pile velocity model to determine the reverse wave field.

[0043] Specifically, when using the acoustic wave recording on the pile side as the earthquake source and performing inversion according to the pile velocity model to determine the reverse wave field, the inversion can also be performed according to the staggered grid finite difference algorithm. During the inversion, the maximum time of the record is used as the calculation start time. The specific calculation formula can refer to the formula used in the forward modeling.

[0044] Exemplarily, performing wavefield separation on the forward wavefield and the reverse wavefield to determine the wavefield components of the pile velocity model includes: Based on Hilbert transform, the forward wave field is converted into a first wave field, and the reverse wave field is converted into a second wave field; Performing Fourier transformation and time-wavenumber domain decomposition on the first wave field to obtain a third wave field; Performing Fourier transformation and time-wavenumber domain decomposition on the second wave field to obtain a fourth wave field; Perform inverse Fourier transform on the third wave field and the fourth wave field to obtain wave field components of the pile velocity model in the time-space domain.

[0045] Specifically, when performing wave field separation on the forward wave field and the reverse wave field to determine the wave field components of the pile velocity model, the forward wave field can first be converted into the first wave field and the reverse wave field can be converted into the second wave field through Hilbert transformation.

[0046] For example, the first wave field and the second wave field can be obtained by the following formula:

[0047]

[0048] in, represents the first wave field, Represents the second wave field.

[0049] Then, the first wave field and the second wave field can be subjected to Fourier transformation and time wave number domain decomposition to obtain the third wave field and the fourth wave field.

[0050] For example, the third and fourth wave fields can be obtained by the following formula:

[0051]

[0052]

[0053]

[0054] in, represents the first wave field after Fourier transformation, represents the second wave field after Fourier transformation, represents the wave number, represents the upgoing wave component of the third wave field, represents the downgoing wave component of the third wave field, represents the upgoing wave component of the fourth wave field, Represents the downgoing wave component of the fourth wave field.

[0055] Finally, the third wave field and the fourth wave field can be subjected to inverse Fourier transform to obtain the wave field components of the pile velocity model in the time and space domain.

[0056] For example, the wave field components of the pile velocity model in the time and space domain can be obtained by the following formula:

[0057]

[0058] in, represents the forward wave field in the time-space domain, represents the reverse wave field in the time-space domain, represents the inverse Fourier transform, represents the third wave field, Indicates the fourth wave field.

[0059] Exemplarily, determining the three-dimensional structure of the target pile based on the wave field component of the pile velocity model includes: The wave field component of the pile velocity model is integrated in the time domain to obtain the three-dimensional structure of the target pile.

[0060] Specifically, when determining the three-dimensional structure of the target pile according to the wave field components of the pile velocity model, the wave field components of the pile velocity model can be integrated in the time domain to obtain the three-dimensional structure of the target pile. For example, the three-dimensional structure of the target pile can be obtained by a related wave field integration algorithm.

[0061] The three-dimensional structure of the target pile can be calculated by the following formula:

[0062]

[0063]

[0064] in, and are positive upward wave and downward wave respectively. and are reverse upward wave and downward wave respectively. ,Right now , , is the grid point of the pile The three-dimensional structure of To calculate the maximum time. It can be seen as a structure composed of the structure obtained by integrating the forward upward wave and the reverse downward wave, the structure obtained by integrating the forward upward wave and the reverse upward wave, the structure obtained by integrating the forward downward wave and the reverse upward wave, and the structure obtained by integrating the forward downward wave and the reverse downward wave.

[0065] Exemplarily, the Ricker wavelet and the pile side acoustic wave record have the same source position, and the pile side acoustic wave record is obtained by detection after acoustic wave excitation on the pier corresponding to the target foundation pile.

[0066] Specifically, when performing forward and inversion calculations, it is necessary to ensure that the source locations of the Ricker wavelet and the pile side acoustic wave records are the same.

[0067] In addition, the pile side acoustic wave record is obtained by detection after acoustic wave excitation on the pier corresponding to the target foundation pile.

[0068] The technical solution of the present invention is better described below with reference to a specific embodiment: Combination Figure 2 Come and see, Figure 2 The present invention provides a flow chart of an embodiment of an existing bridge foundation pile detection process, which specifically includes the following steps: 1. Data collection.

[0069] An observation system is arranged along one side of the pier corresponding to the foundation pile of the bridge to be inspected, and a hammer is used to hit the rubber plate as the source of the earthquake to collect multiple long-term sound wave records. To ensure the accuracy of imaging, the interval between the sound wave detectors should be 10 cm, the number of detectors should be no less than 12, and the offset distance should not be less than 1 m. Figure 3 Come and see, Figure 3A schematic diagram of an embodiment of a pile side acoustic wave recording and collection scenario provided by the present invention.

[0070] 2. Forward calculation.

[0071] The bridge pile model is forward calculated based on the acoustic wave equation, and the forward wave field of each model grid point at each time is saved, which is recorded as .

[0072] The acoustic wave equation is expressed as follows:

[0073] in, represents the stress wave field, represents the propagation time, represents the density of the medium, represents the longitudinal wave velocity of sound waves in the medium, It represents the horizontal vibration velocity of particles in the medium. It represents the vertical vibration velocity of the particle in the medium. Indicates the horizontal direction, Indicates the vertical direction.

[0074] The forward calculation formula is as follows:

[0075]

[0076]

[0077]

[0078] in, represents the Ricker wavelet, represents the wavelet frequency, represents the spatial step length in the horizontal direction, represents the spatial step length in the vertical direction, represents the time step, is the difference order, is the time discrete sequence number, is the difference coefficient.

[0079] 3. Inversion calculation.

[0080] The acoustic wave signal collected from the pile side is used as the seismic source. The foundation pile model is calculated in reverse along the time axis. The maximum time is used as the calculation start time. The calculation process in the forward calculation is repeated, and the reverse stress wave field of each model grid point at each time is recorded, which is recorded as .

[0081] 4. Wave field decomposition.

[0082] In the process of sound waves propagating downward along the pile foundation, they are affected by the steel bars, concrete and defects inside the pile foundation, and scattered waves propagating in different directions are generated. These scattered waves are generally of high energy, and they are mixed with the reflection of the pile foundation, which seriously affects the effective signal of the pile foundation and reduces the detection accuracy of the pile foundation. In order to reduce the influence of scattered waves, the present invention proposes a wave field separation algorithm in the time wave number domain, which decomposes the forward wave field and the reverse wave field, and eliminates invalid scattered waves during imaging, thereby retaining the effective signal of the pile foundation and improving the imaging accuracy. The specific steps of decomposing the wave field are: (1) The forward and reverse wave fields of the pile foundation are converted into analytical wave fields through Hilbert transform:

[0083]

[0084] (2) Perform Fourier transform on the analytical wave field and decompose it in the time-wavenumber domain:

[0085]

[0086]

[0087]

[0088] (3) Perform inverse Fourier transform on the wave field components in the time-wavenumber domain to obtain the wave field components in the time-space domain:

[0089]

[0090] in and Source analysis wavefield Analyzing wave fields with geophones The Fourier transform of is the wave number. and They are the up / down wave components of the forward wave field and the reverse wave field in the time wavenumber domain respectively. , They are the forward wave field and the reverse wave field up / down waves in the time-space domain, is the one-dimensional inverse Fourier transform.

[0091] 5. Pile imaging.

[0092] Pile forward wave field and reverse wavefield Decomposed into two parts: upgoing wave and downgoing wave:

[0093]

[0094] The pile imaging volume is obtained according to the relevant wave field integration algorithm:

[0095] in, and are positive upward wave and downward wave respectively. and are reverse upward wave and downward wave respectively. ,Right now , , is the grid point of the pile The three-dimensional imaging body, To calculate the maximum time. It can be seen as a structure composed of the structure obtained by integrating the forward upward wave and the reverse downward wave, the structure obtained by integrating the forward upward wave and the reverse upward wave, the structure obtained by integrating the forward downward wave and the reverse upward wave, and the structure obtained by integrating the forward downward wave and the reverse downward wave.

[0096] The existing bridge pile detection method based on acoustic wave scattering proposed in the present invention is not affected by the bridge superstructure and surrounding noise, and can quickly and accurately detect the integrity of bridge piles. The time wavenumber domain wave field separation algorithm proposed in the present invention improves the calculation weight of the pile reflection signal, reduces the calculation weight of invalid waves such as pile side soil, superstructure, external disturbance, etc., thereby improving the pile detection resolution. The correlation wave field integration algorithm proposed in the present invention reduces the dependence on the initial model, realizes the automation of the imaging process, reduces the influence of human misjudgment, and improves the accuracy of pile imaging.

[0097] The embodiment of the present invention also provides a non-destructive testing device for existing bridge piles, Figure 4 Come and see, Figure 4 The present invention provides a schematic structural diagram of an embodiment of a nondestructive testing device for existing bridge piles. The nondestructive testing device 400 for existing bridge piles includes: A construction module 401 is used to construct a pile velocity model based on the propagation characteristics of the sound wave in the target pile and the density of the target pile; The first determination module 402 is used to use the Ricker wavelet as the seismic source, perform forward modeling based on the pile velocity model to determine the forward wave field, and use the pile side acoustic wave record as the seismic source, perform inversion based on the pile velocity model to determine the reverse wave field; A second determination module 403 is used to perform wave field separation on the forward wave field and the reverse wave field to determine the wave field components of the pile velocity model; The detection module 404 is used to determine the three-dimensional structure of the target pile based on the wave field component of the pile velocity model, and detect the target pile based on the three-dimensional structure.

[0098] The specific implementation methods of each module of the nondestructive testing device for existing bridge foundation piles can refer to the description of the nondestructive testing method for existing bridge foundation piles mentioned above, and have similar beneficial effects, which will not be repeated here.

[0099] The embodiment of the present invention further provides an electronic device, Figure 5 Come and see, Figure 5 This is a structural diagram of an embodiment of an electronic device provided by the present invention. The electronic device 500 includes a processor 501, a memory 502, and a computer program stored in the memory 502 and executable on the processor 501. When the processor 501 executes the program, the nondestructive testing method for existing bridge foundation piles as described above is implemented.

[0100] As a preferred embodiment, the electronic device 500 further includes a display 503 for displaying that the processor 501 executes the above-mentioned non-destructive testing method for existing bridge foundation piles.

[0101] Exemplarily, the computer program may be divided into one or more modules / units, one or more modules / units are stored in the memory 502, and are executed by the processor 501 to complete the present invention. One or more modules / units may be a series of computer program instruction segments that can complete specific functions, and the instruction segments are used to describe the execution process of the computer program in the electronic device 500. For example, the computer program may be divided into the construction module 401, the first determination module 402, the second determination module 403, and the detection module 404 in the above embodiment. The specific functions of each module are as described above, and are not described one by one here.

[0102] The electronic device 500 may be a desktop computer, a notebook, a PDA or a smart phone with an adjustable camera module.

[0103] Among them, the processor 501 may be an integrated circuit chip with signal processing capabilities. The above-mentioned processor 501 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present invention can be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0104] The memory 502 may be, but is not limited to, a random access memory (RAM), a read only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable read-only memory (EEPROM), etc. The memory 502 is used to store programs, and the processor 501 executes the program after receiving an execution instruction. The process definition method disclosed in any of the above embodiments of the present invention may be applied to the processor 501, or implemented by the processor 501.

[0105] The display 503 may be an LCD display screen or an LED display screen, for example, a display screen on a mobile phone.

[0106] Understandably, Figure 5 The structure shown is only a schematic diagram of the structure of the electronic device 500. The electronic device 500 may also include Figure 5 More or fewer components as shown. Figure 5 Each component shown in the figure can be implemented by hardware, software or a combination thereof.

[0107] The electronic device provided according to the above-mentioned embodiment of the present invention can be implemented with reference to the specific description of the method for nondestructive testing of existing bridge foundation piles according to the present invention, and has similar beneficial effects as the method for nondestructive testing of existing bridge foundation piles as described above, which will not be repeated here.

[0108] An embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the nondestructive testing method for existing bridge foundation piles as described above is implemented.

[0109] Generally speaking, the computer instructions for implementing the method of the present invention can be carried by any combination of one or more computer-readable storage media. Non-transitory computer-readable storage media can include any computer-readable media except for the signal itself that is temporarily propagating.

[0110] Computer-readable storage media may be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or devices, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection having one or more conductors, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium may be any tangible medium that contains or stores a program that may be used by or in conjunction with an instruction execution system, apparatus, or device.

[0111] Computer program codes for performing the operations of the present invention may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" or similar programming languages, in particular, Python suitable for neural network computing and platform frameworks based on TensorFlow, PyTorch, etc. may be used. The program code may be executed entirely on the user's computer, partially on the user's computer, as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0112] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0113] The present invention discloses a nondestructive testing method and device for existing bridge foundation piles. The method constructs a foundation pile velocity model corresponding to a target foundation pile, obtains a forward wave field and a reverse wave field of the foundation pile velocity model through forward modeling and inversion, and finally obtains a wave field component of the foundation pile velocity model through wave field separation, thereby constructing a three-dimensional structure of the target foundation pile for detecting the target foundation pile. The entire detection process is not affected by the foundation pile superstructure, and the detection process is convenient and fast, thereby effectively reducing the cost of nondestructive testing of the foundation piles.

[0114] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A non-destructive testing method for existing bridge piles, characterized in that: include: Constructing a pile velocity model based on the propagation characteristics of the sound waves in the target piles and the density of the target piles; Taking the Ricker wavelet as the seismic source, forward modeling is performed based on the pile velocity model to determine the forward wave field, and taking the pile side acoustic wave record as the seismic source, inversion is performed based on the pile velocity model to determine the reverse wave field; Performing wave field separation on the forward wave field and the reverse wave field to determine the wave field components of the pile velocity model; The three-dimensional structure of the target pile is determined based on the wave field component of the pile velocity model, and the target pile is detected based on the three-dimensional structure.

2. The nondestructive testing method for existing bridge foundation piles according to claim 1 is characterized in that: The method of constructing a pile velocity model based on the propagation characteristics of the sound waves in the target piles and the density of the target piles includes: A pile velocity model is constructed based on the longitudinal wave velocity of the sound wave in the target pile, the horizontal vibration velocity and the vertical vibration velocity of the mass point in the target pile and the density of the target pile.

3. The nondestructive testing method for existing bridge foundation piles according to claim 1 is characterized in that: The method of taking the Ricker wavelet as the seismic source and performing forward modeling based on the pile velocity model to determine the forward wave field includes: Taking the Ricker wavelet as the earthquake source, forward modeling is performed based on the staggered grid finite difference algorithm and the pile velocity model to determine the forward wave field.

4. The nondestructive testing method for existing bridge foundation piles according to claim 1, characterized in that: The method of using the acoustic wave recording on the pile side as the earthquake source and performing inversion based on the pile velocity model to determine the reverse wave field includes: Taking the acoustic wave record on the pile side as the seismic source, inversion is performed based on the staggered grid finite difference algorithm and the pile velocity model to determine the reverse wave field.

5. The nondestructive testing method for existing bridge foundation piles according to claim 1, characterized in that: The step of performing wavefield separation on the forward wavefield and the reverse wavefield to determine the wavefield components of the pile velocity model includes: Based on Hilbert transform, the forward wave field is converted into a first wave field, and the reverse wave field is converted into a second wave field; Performing Fourier transformation and time-wavenumber domain decomposition on the first wave field to obtain a third wave field; Performing Fourier transformation and time-wavenumber domain decomposition on the second wave field to obtain a fourth wave field; Perform inverse Fourier transform on the third wave field and the fourth wave field to obtain wave field components of the pile velocity model in the time-space domain.

6. The nondestructive testing method for existing bridge foundation piles according to claim 1, characterized in that: The determining the three-dimensional structure of the target pile based on the wave field component of the pile velocity model includes: The wave field component of the pile velocity model is integrated in the time domain to obtain the three-dimensional structure of the target pile.

7. The nondestructive testing method for existing bridge foundation piles according to any one of claims 1 to 6, characterized in that: The Ricker wavelet and the pile side acoustic wave record have the same source position, and the pile side acoustic wave record is obtained by detecting after acoustic wave excitation on the pier corresponding to the target foundation pile.

8. A non-destructive testing device for existing bridge foundation piles, characterized in that: include: A construction module, used to construct a pile velocity model based on the propagation characteristics of the sound wave in the target pile and the density of the target pile; The first determination module is used to use the Ricker wavelet as the seismic source, perform forward modeling based on the pile velocity model to determine the forward wave field, and use the pile side acoustic wave record as the seismic source, perform inversion based on the pile velocity model to determine the reverse wave field; A second determination module is used to perform wave field separation on the forward wave field and the reverse wave field to determine the wave field components of the pile velocity model; A detection module is used to determine the three-dimensional structure of the target pile based on the wave field component of the pile velocity model, and detect the target pile based on the three-dimensional structure.

9. An electronic device, characterized in that: The invention comprises a memory and a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the nondestructive testing method for existing bridge foundation piles according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed by a processor, the non-destructive testing method for existing bridge foundation piles as described in any one of claims 1 to 7 is implemented.

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