A non-destructive testing method and apparatus for existing bridge foundation piles

Abstract

This invention relates to a non-destructive testing method and apparatus for existing bridge foundation piles, belonging to the field of bridge inspection technology. The non-destructive testing method for existing bridge foundation piles includes: constructing a pile velocity model based on the propagation characteristics of sound waves in the target pile and the density of the target pile; using a Ricker wavelet as the source, performing forward modeling based on the pile velocity model to determine the forward wavefield, and using a pile-side acoustic recording as the source, performing inverse modeling based on the pile velocity model to determine the reverse wavefield; separating the forward and reverse wavefields to determine the wavefield components of the pile velocity model; determining the three-dimensional structure of the target pile based on the wavefield components of the pile velocity model, and inspecting the target pile based on the three-dimensional structure. The entire inspection process of this invention is not affected by the superstructure of the pile, and the inspection process is convenient and quick, thereby effectively reducing the cost of non-destructive testing of foundation piles.

Description

Technical Field

[0001] This invention relates to the field of bridge inspection technology, and in particular to a non-destructive testing method and apparatus for existing bridge foundation piles. Background Technology

[0002] With the acceleration of urbanization, highway bridges, railway bridges, and cross-river bridges are under active construction. my country uses well over one million bridge foundation piles annually. During use, these piles are susceptible to damage from water erosion, earthquakes, vehicle overloading, and impacts, leading to issues such as exposed rebar, breakage, diameter reduction, and diameter expansion. These damages can continue to develop, harming the bridge and seriously threatening the safety of its components.

[0003] For existing highway foundation piles with non-free ends (where structures exist), inspection work is usually carried out after the superstructure has already been built. However, due to the influence of the superstructure, traditional pile integrity testing methods are no longer suitable for non-destructive testing of the integrity of such piles. Currently, there are not many effective non-destructive testing methods for substructure piles in bridge inspection, mainly including acoustic wave transmission, low-strain method, side-hole seismic wave method, and cross-hole elastic wave computed tomography (CT).

[0004] Existing methods for non-destructive testing of bridge substructure piles are either unsuitable for piles with superstructures or too costly. Therefore, finding a cost-effective way to perform non-destructive testing on piles with superstructures has become a pressing technical problem. Summary of the Invention

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

[0006] To address the aforementioned problems, this invention provides a non-destructive testing method for existing bridge foundation piles, comprising:

[0007] Based on the propagation characteristics of sound waves in the target pile and the density of the target pile, a pile velocity model is constructed;

[0008] Using the Ricker wavelet as the source, forward modeling was performed based on the pile velocity model to determine the forward wave field, and using the pile side acoustic record as the source, inverse modeling was performed based on the pile velocity model to determine the reverse wave field.

[0009] Wavefield separation is performed on the forward wavefield and the reverse wavefield to determine the wavefield components of the pile velocity model;

[0010] The three-dimensional structure of the target pile is determined based on the wave field components of the pile velocity model, and the target pile is then detected based on the three-dimensional structure.

[0011] In one possible implementation, constructing the pile velocity model based on the propagation characteristics of sound waves in the target pile and the density of the target pile includes:

[0012] A pile velocity model is constructed based on the longitudinal wave velocity of the sound wave in the target pile, the horizontal and vertical vibration velocities of the particles in the target pile, and the density of the target pile.

[0013] In one possible implementation, the determination of the forward wavefield based on the pile velocity model, using the Ricker wavelet as the seismic source, includes:

[0014] Using the Ricker wavelet as the seismic source, forward modeling was performed based on the staggered grid finite difference algorithm and the aforementioned pile velocity model to determine the forward wave field.

[0015] In one possible implementation, the step of using pile-side acoustic records as the seismic source and performing inversion based on the pile velocity model to determine the reverse wave field includes:

[0016] Using the pile-side acoustic record as the seismic source, the reverse wave field is determined by inversion based on the staggered grid finite difference algorithm and the pile velocity model.

[0017] In one possible implementation, the step of separating the forward and reverse wave fields to determine the wave field components of the pile velocity model includes:

[0018] Based on the 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;

[0019] The first wavefield is subjected to Fourier transform and time wavenumber domain decomposition to obtain the third wavefield;

[0020] The fourth wavefield is obtained by performing Fourier transform and time wavenumber domain decomposition on the second wavefield.

[0021] Perform inverse Fourier transform on the third and fourth wave fields to obtain the wave field components of the pile velocity model in the time-space domain.

[0022] In one possible implementation, determining the three-dimensional structure of the target pile based on the wave field components of the pile velocity model includes:

[0023] The wave field components of the pile velocity model are integrated in the time domain to obtain the three-dimensional structure of the target pile.

[0024] In one possible implementation, the source locations of the Rick wavelet and the pile-side acoustic record are the same, and the pile-side acoustic record is obtained by detection after acoustic excitation on the pier corresponding to the target pile.

[0025] The present invention also provides a non-destructive testing device for existing bridge foundation piles, comprising:

[0026] A construction module is used to construct a pile velocity model based on the propagation characteristics of sound waves in the target pile and the density of the target pile;

[0027] The first determining module is used to determine the forward wave field by performing forward modeling based on the pile velocity model using the Ricker wavelet as the source, and to determine the reverse wave field by performing inverse modeling based on the pile velocity model using the pile side acoustic record as the source.

[0028] The second determining module is used to perform wavefield separation on the forward wavefield and the reverse wavefield to determine the wavefield components of the pile velocity model;

[0029] The detection module is used to determine the three-dimensional structure of the target pile based on the wave field components of the pile velocity model, and to detect the target pile based on the three-dimensional structure.

[0030] 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, it implements the non-destructive testing method for existing bridge foundation piles as described above.

[0031] The present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the non-destructive testing method for existing bridge foundation piles as described above.

[0032] The beneficial effects of the present invention are as follows: The non-destructive testing method and device for existing bridge foundation piles provided by the present invention constructs a pile velocity model corresponding to the target pile, then obtains the forward and reverse wave fields of the pile velocity model through forward and inverse modeling, 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 superstructure of the pile, and the detection process is convenient and fast, thereby effectively reducing the cost of non-destructive testing of piles. Attached Figure Description

[0033] Figure 1 A flowchart illustrating an embodiment of the non-destructive testing method for existing bridge foundation piles provided by the present invention;

[0034] Figure 2 A flowchart illustrating an embodiment of the existing bridge foundation pile testing process provided by the present invention;

[0035] Figure 3 A schematic diagram of an embodiment of the pile-side acoustic recording and acquisition scenario provided by the present invention;

[0036] Figure 4 A schematic diagram of an embodiment of the non-destructive testing device for existing bridge foundation piles provided by the present invention;

[0037] Figure 5 A schematic diagram of the structure of an embodiment of the electronic device provided by the present invention. Detailed Implementation

[0038] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form 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 intended to limit the scope of the present invention.

[0039] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Furthermore, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0040] In the description of this invention, reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the described embodiments can be combined with other embodiments.

[0041] With the acceleration of urbanization, highway bridges, railway bridges, and cross-river bridges are under active construction. my country uses well over one million bridge foundation piles annually. During use, these piles are susceptible to damage from water erosion, earthquakes, vehicle overloading, and impacts, leading to issues such as exposed rebar, breakage, diameter reduction, and diameter expansion. These damages can continue to develop, harming the bridge and seriously threatening the safety of its components.

[0042] For existing highway foundation piles with non-free ends (where structures exist), inspection work is usually carried out after the structures are already in place. However, due to the influence of the superstructure, traditional pile integrity testing methods are no longer suitable for non-destructive testing of the integrity of such piles. Currently, there are not many effective non-destructive testing methods for substructure piles in bridge inspection, mainly including acoustic wave transmission, low-strain method, side-hole seismic wave method, and cross-hole elastic wave CT method.

[0043] Existing methods for non-destructive testing of bridge substructure piles are either unsuitable for piles with superstructures or have high testing costs.

[0044] To address the aforementioned problems, this invention provides a non-destructive testing method for existing bridge foundation piles.

[0045] The specific embodiments are described in detail below:

[0046] A specific embodiment of the present invention discloses a non-destructive testing method for existing bridge foundation piles, combined with... Figure 1 Let's take a look. Figure 1 A flowchart illustrating an embodiment of the non-destructive testing method for existing bridge foundation piles provided by the present invention includes steps S101 to S104, wherein:

[0047] In step S101, a pile velocity model is constructed based on the propagation characteristics of sound waves in the target pile and the density of the target pile;

[0048] In step S102, using the Ricker wavelet as the source, forward modeling is performed based on the pile velocity model to determine the forward wave field, and using the pile side acoustic record as the source, inverse modeling is performed based on the pile velocity model to determine the reverse wave field.

[0049] In step S103, the forward wave field and the reverse wave field are separated to determine the wave field components of the pile velocity model.

[0050] In step S104, the three-dimensional structure of the target pile is determined based on the wave field components of the pile velocity model, and the target pile is detected based on the three-dimensional structure.

[0051] During implementation, the physical characteristics of the target pile can first be determined, followed by the propagation characteristics of sound waves within the target pile and the pile's density. Subsequently, based on the sound wave propagation characteristics and the pile's density, a pile velocity model can be constructed. This model can be used to reflect the propagation patterns of sound waves within the target pile.

[0052] Next, using the Ricker wavelet as the source, forward modeling can be performed using the pile velocity model to determine the forward wave field. Simultaneously, using the pile-side acoustic record as the source, inverse modeling can be performed using the pile velocity model to determine the reverse wave field. The pile-side acoustic record can be the record obtained by detecting acoustic waves after acoustic excitation on the target pile.

[0053] Then, the forward and reverse wave fields can be separated to determine the wave field components of the pile velocity model. Based on the wave field components of the pile velocity model, the three-dimensional structure of the target pile can be constructed, and non-destructive testing can be achieved through the three-dimensional structure of the target pile.

[0054] The non-destructive testing method for existing bridge pile foundations provided by this invention can be applied to non-destructive testing scenarios for existing highway bridge pile foundations, as well as to non-destructive testing of other types of bridge pile foundations. This invention does not specifically limit the application of this method.

[0055] Compared with existing technologies, the non-destructive testing method for existing bridge pile foundations provided in this embodiment constructs a pile velocity model corresponding to the target pile, then obtains the forward and reverse wave fields of the pile velocity model through forward and inverse modeling, 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 superstructure of the pile, and the detection process is convenient and fast, thus effectively reducing the cost of non-destructive testing of pile foundations.

[0056] For example, the construction of the pile velocity model based on the propagation characteristics of sound waves in the target pile and the density of the target pile includes:

[0057] A pile velocity model is constructed based on the longitudinal wave velocity of the sound wave in the target pile, the horizontal and vertical vibration velocities of the particles in the target pile, and the density of the target pile.

[0058] Specifically, when constructing a pile velocity model based on the propagation characteristics of sound waves in the target pile and the density of the target pile, the pile velocity model can be constructed based on the longitudinal wave velocity of the sound waves in the target pile, the horizontal vibration velocity and vertical vibration velocity of the particles in the target pile, and the density of the target pile.

[0059] For example, a pile velocity model can be constructed using the following formula:

[0060]

[0061] in, Represents the stress wave field. Indicates the time of transmission. This indicates the density of the target foundation piles. This represents the longitudinal wave velocity of the sound wave within the target pile. This represents the horizontal vibration velocity of a particle in the target pile. This represents the vertical vibration velocity of a particle within the target pile. Indicates the horizontal direction. Indicates the vertical direction.

[0062] For example, the step of using the Ricker wavelet as the seismic source and performing forward modeling based on the pile velocity model to determine the forward wave field includes:

[0063] Using the Ricker wavelet as the seismic source, forward modeling was performed based on the staggered grid finite difference algorithm and the aforementioned pile velocity model to determine the forward wave field.

[0064] Specifically, when determining the forward wave field using the Ricker wavelet as the source and the pile velocity model, the forward model can be performed using the staggered grid finite difference algorithm and the pile velocity model to determine the forward wave field.

[0065] For example, forward modeling can be performed using the following formula:

[0066]

[0067]

[0068]

[0069]

[0070] in, Represents the Reich wavelet, Indicates the wavelet frequency. Indicates the spatial step size in the horizontal direction. Indicates the spatial step size in the vertical direction. Indicates the time step. Let be the difference order. This represents the time discrete sequence number. These are the difference coefficients.

[0071] For example, the step of using pile-side acoustic records as the seismic source and performing inversion based on the pile velocity model to determine the reverse wave field includes:

[0072] Using the pile-side acoustic record as the seismic source, the reverse wave field is determined by inversion based on the staggered grid finite difference algorithm and the pile velocity model.

[0073] Specifically, when using pile-side acoustic records as the seismic source and performing inversion based on the pile velocity model to determine the reverse wave field, inversion can also be performed using the staggered grid finite difference algorithm. During inversion, the maximum recorded time is used as the calculation start time, and the specific calculation formula can refer to the formula used in forward modeling.

[0074] For example, the step of separating the forward and reverse wavefields to determine the wavefield components of the pile velocity model includes:

[0075] Based on the 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;

[0076] The first wavefield is subjected to Fourier transform and time wavenumber domain decomposition to obtain the third wavefield;

[0077] The fourth wavefield is obtained by performing Fourier transform and time wavenumber domain decomposition on the second wavefield.

[0078] Perform inverse Fourier transform on the third and fourth wave fields to obtain the wave field components of the pile velocity model in the time-space domain.

[0079] Specifically, when separating the forward and reverse wave fields to determine the wave field components of the pile velocity model, the forward wave field can be converted into the first wave field and the reverse wave field can be converted into the second wave field through Hilbert transformation.

[0080] For example, the first and second wave fields can be obtained using the following formula:

[0081]

[0082]

[0083] in, Indicates the first wave field. This indicates the second wave field.

[0084] Then, Fourier transform and time wavenumber domain decomposition can be performed on the first and second wave fields to obtain the third and fourth wave fields.

[0085] For example, the third and fourth wavefields can be obtained using the following formula:

[0086]

[0087]

[0088]

[0089]

[0090] in, This represents the first wave field after the Fourier transform. This represents the second wave field after the Fourier transform. Indicates wave number, This represents the upward wave component of the third wave field. This represents the down-current component of the third wave field. This represents the upward wave component of the fourth wave field. This represents the down-current component of the fourth wave field.

[0091] Finally, an inverse Fourier transform can be performed on the third and fourth wave fields to obtain the wave field components of the pile velocity model in the time-space domain.

[0092] For example, the wave field components of the pile velocity model in the time-space domain can be obtained using the following formula:

[0093]

[0094]

[0095] in, Represents the positive wave field in the time-space domain. Represents the reverse wave field in the time-space domain. Indicates the inverse Fourier transform. Indicates the third wave field. This indicates the fourth wave field.

[0096] For example, determining the three-dimensional structure of the target pile based on the wave field components of the pile velocity model includes:

[0097] The wave field components of the pile velocity model are integrated in the time domain to obtain the three-dimensional structure of the target pile.

[0098] Specifically, when determining the three-dimensional structure of a target pile based on 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 through a relevant wave field integration algorithm.

[0099] The three-dimensional structure of the target foundation pile can be calculated using the following formula:

[0100]

[0101]

[0102]

[0103] in, and These are positive upward waves and downward waves, respectively. and These are respectively a reverse upward wave and a downward wave. ,Right now , , For the foundation pile grid points The three-dimensional structure To calculate the maximum time. It can be viewed as a structure obtained by integrating the positive upward wave and the negative downward wave, the structure obtained by integrating the positive upward wave and the negative upward wave, the structure obtained by integrating the positive downward wave and the negative upward wave, and the structure obtained by integrating the positive downward wave and the negative downward wave.

[0104] For example, the source locations of the Rick wavelet and the pile-side acoustic record are the same, and the pile-side acoustic record is obtained by detection after acoustic excitation on the pier corresponding to the target pile.

[0105] Specifically, when performing forward and inverse calculations, it is necessary to ensure that the source locations of the Rick wavelet and the pile-side acoustic wave records are the same.

[0106] In addition, the pile-side acoustic recording is obtained by detecting acoustic waves after acoustic excitation on the pier corresponding to the target pile.

[0107] The technical solution of the present invention will be better illustrated below with a specific embodiment:

[0108] Combination Figure 2 Let's take a look. Figure 2 This is a schematic flowchart of an embodiment of the existing bridge foundation pile testing process provided by the present invention. The process specifically includes the following steps:

[0109] 1. Data collection.

[0110] An observation system was deployed along one side of the pier corresponding to the foundation pile of the bridge under inspection. A rubber sheet was struck with a hammer as the seismic source, and multiple long-duration acoustic records were collected. To ensure imaging accuracy, the acoustic detectors should be spaced 10cm apart, with at least 12 detectors and an offset distance of at least 1m. Figure 3 Let's take a look. Figure 3 This is a schematic diagram of an embodiment of the pile-side acoustic recording and acquisition scenario provided by the present invention.

[0111] 2. Forward modeling.

[0112] Forward modeling of a bridge foundation pile model is performed based on the acoustic wave equation, and the forward wave field of each model grid point at each time step is saved, denoted as . .

[0113] The equation for sound waves is expressed as follows:

[0114]

[0115] in, Represents the stress wave field. Indicates the time of transmission. Indicates the density of the medium. This represents the longitudinal wave velocity of sound in a medium. This represents the horizontal vibration velocity of a particle in a medium. This represents the vertical vibration velocity of a particle in a medium. Indicates the horizontal direction. Indicates the vertical direction.

[0116] The forward modeling formula is as follows:

[0117]

[0118]

[0119]

[0120]

[0121] in, Represents the Reich wavelet, Indicates the wavelet frequency. Indicates the spatial step size in the horizontal direction. Indicates the spatial step size in the vertical direction. Indicates the time step. Let be the difference order. This represents the time discrete sequence number. These are the difference coefficients.

[0122] 3. Inversion calculation.

[0123] Using the acoustic signal collected from the pile side as the seismic source, the pile model was calculated in reverse along the time axis, with the maximum time as the starting time of the calculation. The calculation process in the forward modeling was repeated, and the reverse stress wave field of each model grid point at each time step was recorded, denoted as . .

[0124] 4. Wave field decomposition.

[0125] As sound waves propagate downwards along the pile, they are affected by the internal steel reinforcement, concrete, and defects, generating scattered waves that propagate in different directions. These scattered waves generally have high energy and, when superimposed with the pile's reflections, severely affect the effective signal of the pile, reducing the accuracy of pile detection. To reduce the influence of scattered waves, this invention proposes a time-wavenumber domain wavefield separation algorithm. This algorithm decomposes the forward and reverse wavefields, eliminating invalid scattered waves during imaging, thereby preserving the effective signal of the pile and improving imaging accuracy. The specific steps of wavefield decomposition are as follows:

[0126] (1) Convert the forward and reverse wave fields of the foundation pile into analytical wave fields using the Hilbert transform:

[0127]

[0128]

[0129] (2) Perform a Fourier transform on the analytic wave field and decompose it in the time wavenumber domain:

[0130]

[0131]

[0132]

[0133]

[0134] (3) Perform an inverse Fourier transform on the wavefield components in the time wavenumber domain to obtain the wavefield components in the time space domain:

[0135]

[0136]

[0137] in and These are the source analytical wave fields. and detector analyzes the wave field Fourier transform, It is the wave number. and These are the up / down wave components of the forward and reverse wave fields in the time wavenumber domain, respectively. , These are the forward and reverse wave fields in the time and space domains, representing the up / down waves. It is a one-dimensional inverse Fourier transform.

[0138] 5. Foundation pile imaging.

[0139] Positive wave field of foundation pile and reverse wave field It can be decomposed into two parts: an upward wave and a downward wave.

[0140]

[0141]

[0142] The image of the foundation pile is obtained based on the relevant wavefield integration algorithm:

[0143]

[0144] in, and These are positive upward waves and downward waves, respectively. and These are respectively a reverse upward wave and a downward wave. ,Right now , , For the foundation pile grid points Three-dimensional imaging object, To calculate the maximum time. It can be viewed as a structure obtained by integrating the positive upward wave and the negative downward wave, the structure obtained by integrating the positive upward wave and the negative upward wave, the structure obtained by integrating the positive downward wave and the negative upward wave, and the structure obtained by integrating the positive downward wave and the negative downward wave.

[0145] The proposed method for detecting existing bridge foundation piles based on acoustic wave scattering is unaffected by the bridge superstructure and surrounding noise, enabling rapid and high-precision detection of bridge foundation pile integrity. The time-wavenumber domain wavefield separation algorithm proposed in this invention increases the calculation weight of pile reflection signals and reduces the calculation weight of invalid waves from pile side soil, superstructure, and external disturbances, thereby improving pile detection resolution. The proposed correlation wavefield integration algorithm reduces dependence on the initial model, automates the imaging process, reduces the impact of human error, and improves pile imaging accuracy.

[0146] This invention also provides a non-destructive testing device for existing bridge foundation piles, combined with... Figure 4 Let's take a look. Figure 4 This is a schematic diagram of an embodiment of the non-destructive testing device for existing bridge foundation piles provided by the present invention. The non-destructive testing device 400 for existing bridge foundation piles includes:

[0147] Module 401 is used to construct a pile velocity model based on the propagation characteristics of sound waves in the target pile and the density of the target pile;

[0148] The first determining module 402 is used to determine the forward wave field by performing forward modeling based on the pile velocity model using the Ricker wavelet as the source, and to determine the reverse wave field by performing inverse modeling based on the pile velocity model using the pile side acoustic record as the source.

[0149] The second determining module 403 is used to perform wavefield separation on the forward wavefield and the reverse wavefield to determine the wavefield components of the pile velocity model;

[0150] The detection module 404 is used to determine the three-dimensional structure of the target pile based on the wave field components of the pile velocity model, and to detect the target pile based on the three-dimensional structure.

[0151] The specific implementation methods of each module of the non-destructive testing device for existing bridge foundation piles can be found in the description of the non-destructive testing method for existing bridge foundation piles mentioned above, and it has similar beneficial effects, so it will not be repeated here.

[0152] This invention also provides an electronic device, combined with Figure 5 Let's take a look. Figure 5This is a schematic diagram of an embodiment of the 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, it implements the non-destructive testing method for existing bridge foundation piles as described above.

[0153] In a preferred embodiment, the electronic device 500 further includes a display 503 for displaying the processor 501 performing the non-destructive testing method for existing bridge foundation piles as described above.

[0154] For example, a computer program can be divided into one or more modules / units, one or more of which are stored in memory 502 and executed by processor 501 to complete the present invention. One or more modules / units can be a series of computer program instruction segments capable of performing specific functions, which describe the execution process of the computer program in electronic device 500. For example, the computer program can be divided into the construction module 401, the first determining module 402, the second determining module 403, and the detection module 404 in the above embodiments. The specific functions of each module are as described above and will not be repeated here.

[0155] Electronic device 500 can be a desktop computer, laptop, PDA, or smartphone with an adjustable camera module.

[0156] The processor 501 may be an integrated circuit chip with signal processing capabilities. The processor 501 can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can 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 gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this invention. The general-purpose processor can be a microprocessor or any conventional processor.

[0157] The memory 502 may be, but is not limited to, Random Access Memory (RAM), Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), etc. The memory 502 stores programs, and the processor 501 executes these programs upon receiving execution instructions. The process definition method disclosed in any of the foregoing embodiments of the present invention can be applied to the processor 501, or implemented by the processor 501.

[0158] The display 503 can be an LCD screen or an LED screen. For example, the display screen on a mobile phone.

[0159] Understandable Figure 5 The structure shown is only a schematic diagram of one possible structure of electronic device 500. Electronic device 500 may also include more than one of the following: Figure 5 Show more or fewer components. Figure 5 The components shown can be implemented using hardware, software, or a combination thereof.

[0160] The electronic device provided by the above embodiments of the present invention can be implemented with reference to the content specifically described in the present invention for implementing the non-destructive testing method for existing bridge foundation piles as described above, and has similar beneficial effects as the non-destructive testing method for existing bridge foundation piles as described above, which will not be repeated here.

[0161] This invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the non-destructive testing method for existing bridge foundation piles as described above.

[0162] Generally, computer instructions for implementing the methods of the present invention can be carried on any combination of one or more computer-readable storage media. Non-transitory computer-readable storage media can include any computer-readable medium except for signals themselves that are temporarily propagating.

[0163] Computer-readable storage media can be, for example—but not limited to—electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or any combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in connection with an instruction execution system, apparatus, or device.

[0164] Computer program code for performing the operations of this invention can be written in one or more programming languages ​​or a combination thereof. Programming languages ​​include object-oriented programming languages—such as Java, Smalltalk, and C++—as well as conventional procedural programming languages—such as the "C" language or similar programming languages. In particular, Python, suitable for neural network computation, and platform frameworks such as TensorFlow and PyTorch can be used. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can 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 can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0165] Those skilled in the art will understand that all or part of the processes of the methods described in the above embodiments can be implemented by a computer program instructing related hardware, and the program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a disk, optical disk, read-only memory, or random access memory, etc.

[0166] This invention discloses a non-destructive testing method and apparatus for existing bridge foundation piles. By constructing a pile velocity model corresponding to the target pile, and then obtaining the forward and reverse wave fields of the pile velocity model through forward and inverse modeling, the wave field components of the pile velocity model are obtained through wave field separation. This allows for the construction of a three-dimensional structure of the target pile for pile detection. The entire detection process is not affected by the superstructure of the pile and is convenient and quick, thereby effectively reducing the cost of non-destructive testing of piles.

[0167] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A non-destructive testing method for existing bridge foundation piles, characterized in that, include: Based on the propagation characteristics of sound waves in the target pile and the density of the target pile, a pile velocity model is constructed; Using the Ricker wavelet as the source, forward modeling was performed based on the pile velocity model to determine the forward wave field, and using the pile side acoustic record as the source, inverse modeling was performed based on the pile velocity model to determine the reverse wave field. Wavefield separation is performed on the forward wavefield and the reverse wavefield to determine the wavefield components of the pile velocity model; The three-dimensional structure of the target pile is determined based on the wave field components of the pile velocity model, and the target pile is detected based on the three-dimensional structure. The step of separating the forward and reverse wavefields to determine the wavefield components of the pile velocity model includes: Based on the 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; The first wavefield is subjected to Fourier transform and time wavenumber domain decomposition to obtain the third wavefield; The fourth wavefield is obtained by performing Fourier transform and time wavenumber domain decomposition on the second wavefield. Perform inverse Fourier transform on the third and fourth wave fields to obtain the wave field components of the pile velocity model in the time-space domain.

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

3. The non-destructive testing method for existing bridge foundation piles according to claim 1, characterized in that, The determination of the forward wavefield using the Ricker wavelet as the seismic source and based on the pile velocity model includes: Using the Ricker wavelet as the seismic source, forward modeling was performed based on the staggered grid finite difference algorithm and the aforementioned pile velocity model to determine the forward wave field.

4. The non-destructive testing method for existing bridge foundation piles according to claim 1, characterized in that, The process of using pile-side acoustic records as the seismic source and performing inversion based on the pile velocity model to determine the reverse wavefield includes: Using the pile-side acoustic record as the seismic source, the reverse wave field is determined by inversion based on the staggered grid finite difference algorithm and the pile velocity model.

5. The non-destructive testing method for existing bridge foundation piles according to claim 1, characterized in that, The determination of the three-dimensional structure of the target pile based on the wave field components of the pile velocity model includes: The wave field components of the pile velocity model are integrated in the time domain to obtain the three-dimensional structure of the target pile.

6. The non-destructive testing method for existing bridge foundation piles according to any one of claims 1 to 5, characterized in that, The source locations of the Reich wavelet and the pile-side acoustic record are the same. The pile-side acoustic record is obtained by detecting acoustic waves after acoustic excitation on the pier corresponding to the target pile.

7. A non-destructive testing device for existing bridge foundation piles, characterized in that, include: A construction module is used to construct a pile velocity model based on the propagation characteristics of sound waves in the target pile and the density of the target pile; The first determining module is used to determine the forward wave field by performing forward modeling based on the pile velocity model using the Ricker wavelet as the source, and to determine the reverse wave field by performing inverse modeling based on the pile velocity model using the pile side acoustic record as the source. The second determining module is used to perform wavefield separation on the forward wavefield and the reverse wavefield to determine the wavefield components of the pile velocity model; The detection module is used to determine the three-dimensional structure of the target pile based on the wave field components of the pile velocity model, and to detect the target pile based on the three-dimensional structure. The step of separating the forward and reverse wavefields to determine the wavefield components of the pile velocity model includes: Based on the 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; The first wavefield is subjected to Fourier transform and time wavenumber domain decomposition to obtain the third wavefield; The fourth wavefield is obtained by performing Fourier transform and time wavenumber domain decomposition on the second wavefield. Perform inverse Fourier transform on the third and fourth wave fields to obtain the wave field components of the pile velocity model in the time-space domain.

8. An electronic device, characterized in that, It includes a memory and a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, it implements the non-destructive testing method for existing bridge foundation piles according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, It stores a computer program, which, when executed by a processor, implements the non-destructive testing method for existing bridge foundation piles as described in any one of claims 1 to 6.

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