Pile foundation damage identification method and device, equipment and storage medium

Abstract

According to the pile foundation damage identification method, device and equipment and the storage medium, the pile foundation fluctuation signal is obtained through the array sensor arranged on the surface of the pile foundation, wave field separation is conducted on the pile foundation fluctuation signal, and the wave field signal feature of the pile foundation fluctuation signal is obtained; and combined analysis of wave energy and peak values is conducted on the wave field signal characteristics, and the local damage position of the pile foundation is determined. According to the method, wave field separation is carried out on the pile foundation fluctuation signals, valuable wave field signal features are extracted, and therefore combined analysis of wave energy and peak values is carried out, pile foundation damage of different depths and different directions is comprehensively evaluated, and accurate positioning of the pile foundation damage is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of pile foundation detection, and in particular to a method, device, equipment and storage medium for identifying pile foundation damage. Background Art

[0002] As an important part of building structure, the health of pile foundation is directly related to the stability and safety of the project. Since pile foundations are mostly located in underground environments, they are affected by complex loads and soil media for a long time, and may suffer from fatigue, cracking and other damages, threatening the safety of the project. However, traditional pile foundation detection methods usually rely on macroscopic observation or static load testing, which has a complex detection process, low efficiency, and it is difficult to accurately identify the specific location and extent of damage.

[0003] Therefore, detection technology based on array sensors and wave field separation has gradually become a research hotspot. By extracting the characteristics of the wave signal in the pile foundation and combining frequency domain and wave number domain analysis, accurate identification of pile foundation damage can be achieved. However, in the signal processing process, the existing technology is limited by noise interference, false frequency effect and the complexity of calculation of reflection wave enhancement coefficient, and it is still difficult to achieve high-precision determination of the location and size of pile foundation damage.

[0004] In summary, the problems existing in the prior art need to be solved urgently. Summary of the invention

[0005] The present invention provides a method, device, equipment and storage medium for identifying pile foundation damage, which are used to solve the defects in the prior art and achieve accurate positioning of pile foundation damage.

[0006] The present invention provides a method for identifying pile foundation damage, comprising: Acquiring a pile foundation fluctuation signal, wherein the pile foundation fluctuation signal is acquired by an array sensor arranged on the surface of the pile foundation; Performing wave field separation on the pile foundation wave signal to obtain wave field signal characteristics of the pile foundation wave signal; The wave field signal characteristics are subjected to a combined analysis of wave energy and peak value to determine the local damage position of the pile foundation.

[0007] According to a method for identifying pile foundation damage provided by the present invention, after the step of obtaining the pile foundation fluctuation signal, the method further comprises the following steps: Performing wavelet transform noise reduction processing on the pile foundation fluctuation signal; The wavelet transform denoising process is as follows:

[0008]

[0009]

[0010] in, j is the number of wavelet decomposition layers, For the j Layer wavelet decomposition scaling coefficient, For the j −1-layer wavelet decomposition scaling coefficient, For the j Layer decomposition coefficient, For the j −1 layer decomposition coefficient, For the j Layer wavelet coefficients, is the sequence number of the sampling point in the discrete time series, is the transform coefficient index of discrete wavelet transform, is the reflection coefficient of the filter, is the reflection coefficient of the filter, is the filter coefficient of the low-pass filter, is the filter coefficient of the high-pass filter.

[0011] According to a pile foundation damage identification method provided by the present invention, the step of performing wave field separation on the pile foundation fluctuation signal to obtain the wave field signal characteristics of the pile foundation fluctuation signal specifically includes: Converting the pile foundation vibration signal into frequency domain and wave number domain; For the converted pile foundation vibration signal, the positive and negative wave fields are extracted through filters to obtain the upgoing wave and the downgoing wave; Performing a two-dimensional inverse Fourier transform on the upgoing wave and the downgoing wave to obtain upgoing wavefield data and downgoing wavefield data.

[0012] According to a pile foundation damage identification method provided by the present invention, the step of performing a combined analysis of wave energy and peak value on the wave field signal characteristics to determine the local damage position of the pile foundation specifically includes: Determining a reflection signal coefficient at each position according to the upgoing wavefield data and the downgoing wavefield data; Determining the Z-axis coordinate of the local damage position of the pile foundation according to the wave number and depth of the upgoing wavefield data and the downgoing wavefield data; According to the local reflection signal enhancement coefficient, the X-axis coordinate of the local damage position of the pile foundation is determined; The local damage position of the pile foundation is determined according to the Z-axis coordinate and the X-axis coordinate.

[0013] According to a pile foundation damage identification method provided by the present invention, the step of determining the Z-axis coordinate of the local damage position of the pile foundation according to the wave number and depth of the upgoing wavefield data and the downgoing wavefield data specifically includes: Determining the wavefield components and reflected wave signal coefficients at each position according to the wavenumber and depth of the upgoing wavefield data and the downgoing wavefield data; Determining a wave number abnormal change point based on the wave field component and the reflected wave signal coefficient; According to the abnormal wave number change point, the Z-axis coordinate of the local damage position of the pile foundation is determined.

[0014] According to a pile foundation damage identification method provided by the present invention, the wave field component is obtained by the following method:

[0015]

[0016] in, is the wave field component, is the upgoing wave field data, is the time window function, is the reference depth position, is the propagation speed of the wave; The reflected wave signal coefficient is obtained by the following method:

[0017] in, is the reflection wave signal coefficient at the Zth depth position, It is the downlink wave field data.

[0018] According to a pile foundation damage identification method provided by the present invention, the local reflection signal enhancement coefficient is obtained by the following method:

[0019] in, M and N is the number of grouping columns, is the local reflection signal enhancement coefficient, which indicates the reflection wave comparison between different groups. For Z Position i Column sensor data, For Z Position j Column sensor data.

[0020] The present invention also provides a pile foundation damage identification device, comprising: A signal acquisition module, used to acquire a pile foundation fluctuation signal, wherein the pile foundation fluctuation signal is acquired by an array sensor arranged on the surface of the pile foundation; A wave field separation module, used for performing wave field separation on the pile foundation wave signal to obtain wave field signal characteristics of the pile foundation wave signal; The damage determination module is used to perform a combined analysis of wave energy and peak value on the wave field signal characteristics to determine the local damage position of the pile foundation.

[0021] The present invention also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the method for identifying pile foundation damage as described in any one of the above is implemented.

[0022] The present invention also provides a non-transitory computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the method for identifying pile foundation damage as described in any one of the above is implemented.

[0023] The present invention also provides a computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the method for identifying pile foundation damage as described in any one of the above is implemented.

[0024] The pile foundation damage identification method, device, equipment and storage medium provided by the present invention obtains the pile foundation fluctuation signal through an array sensor arranged on the surface of the pile foundation, performs wave field separation on the pile foundation fluctuation signal, and obtains the wave field signal characteristics of the pile foundation fluctuation signal; performs a combined analysis of wave energy and peak value on the wave field signal characteristics to determine the local damage position of the pile foundation. The present invention extracts valuable wave field signal characteristics by performing wave field separation on the pile foundation fluctuation signal, thereby performing a combined analysis of wave energy and peak value, so as to comprehensively evaluate the pile foundation damage at different depths and directions, and realize accurate positioning of the pile foundation damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a schematic diagram of the process of the pile foundation damage identification method provided by the present invention; Figure 2 It is a structural schematic diagram of a pile foundation damage identification device provided by the present invention; Figure 3 It is a structural schematic diagram of the electronic device provided by the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] In order to solve the problems in the prior art, the present invention proposes a method for identifying pile foundation damage to achieve accurate positioning of pile foundation damage. The following is a description of the method for identifying pile foundation damage. Figure 1 As shown, including but not limited to the following steps: Step 110: Acquire a pile foundation fluctuation signal, wherein the pile foundation fluctuation signal is acquired by an array sensor disposed on the surface of the pile foundation.

[0029] In step 110, firstly, an array sensor is set on the surface of the pile foundation to obtain the fluctuation signal of the pile foundation. The array sensor can be a piezoelectric sensor, an optical fiber sensor, etc., which can sense the fluctuation signal generated by the pile foundation when it is affected by external loads, vibrations or other environmental factors.

[0030] Array sensors should be evenly distributed on the surface of the pile foundation to ensure that the fluctuation signal of the pile foundation can be fully captured. The spacing of the sensors is usually reasonably designed according to the size, depth and fluctuation characteristics of the pile foundation. The sensor layout can be in the form of a multi-column array to improve the accuracy and coverage of signal acquisition.

[0031] Each sensor captures and records the signal of the pile foundation surface fluctuation in real time. The signal type is the time series fluctuation data, specifically including information such as amplitude, frequency, waveform, etc. The pile foundation fluctuation signal can be expressed as a time domain signal, which records the change of the fluctuation signal over time.

[0032] The data acquisition system transmits the signals collected by each sensor to the signal processing module in real time. This module is responsible for further analysis and processing of the original signals output by the sensor.

[0033] Step 120: performing wave field separation on the pile foundation wave signal to obtain wave field signal characteristics of the pile foundation wave signal.

[0034] In step 120, the acquired pile foundation wave signal needs to be processed by wave field separation. The purpose of wave field separation is to extract upgoing waves and downgoing waves from the original wave signal so as to further analyze the characteristics of the reflected wave.

[0035] First, the pile foundation vibration signal is converted from the time domain to the frequency domain and wave number domain. The spectrum information of the signal can be extracted through Fourier transform or other transformation methods. Through spectrum analysis, the wave number distribution and frequency characteristics of the signal can be understood, providing basic data for subsequent wave field separation.

[0036] Next, by designing a suitable filter, the upgoing wave and the downgoing wave are separated. The upgoing wave refers to the wave that is excited by the bottom of the pile foundation or the surrounding environment and propagates to the surface of the pile foundation. It is usually used to detect the state of the ground or foundation; the downgoing wave is the wave signal transmitted from the surface of the pile foundation to the deep layer of the pile foundation or the surrounding medium. It is often used to monitor the condition inside the pile foundation.

[0037] Upgoing and downgoing waves can be extracted by using different wavenumber domain filtering techniques or reflection wave separation algorithms. For example, by setting different frequency thresholds, the corresponding upgoing and downgoing wave components can be screened out, thereby obtaining the separated wave field signal characteristics.

[0038] After wave field separation, the frequency domain signals of the upgoing and downgoing waves obtained will serve as the basic data for subsequent analysis and can provide key information for subsequent damage location and analysis.

[0039] Step 130: Perform a combined analysis of wave energy and peak value on the wave field signal characteristics to determine the local damage position of the pile foundation.

[0040] The core of this step is to conduct a combined analysis of wave energy and peak value on the wave field signal characteristics, and to determine the local damage location of the pile foundation by analyzing the energy distribution of the local reflection signal and the wave field signal.

[0041] Perform wave energy analysis on the extracted upgoing and downgoing wave signals. Wave energy can be represented by the amplitude square and frequency characteristics of the signal. Common energy calculation methods include:

[0042] Among them, v(x, t) is the amplitude of the wave signal, and E is the wave energy. By calculating the energy of the upgoing and downgoing waves, it can help determine the energy loss and reflection characteristics during the signal transmission process.

[0043] Analyze the peak characteristics of the wave field signal. Since damage will cause changes in the reflected waves of the pile surface, the peak position and signal intensity changes of the reflected waves can be used as potential indicators of damage. Use the peak detection algorithm to extract the maximum and minimum values ​​in the waveform and further analyze its change characteristics.

[0044] Based on the wave energy distribution and peak changes of the upgoing and downgoing waves, the possible location of the pile foundation damage can be inferred. In particular, when the reflection wave coefficient of the wave field signal changes significantly, it usually means that there is an abnormality or damage at that location. Certain specific locations of the wave field signal (such as the reflection wave enhancement point) can be determined as damaged areas.

[0045] Combining the analysis results of wave energy and peak value, certain judgment rules are adopted to identify the area of ​​local damage. For example, by setting the energy threshold and peak change threshold, the local damage position of the pile foundation can be accurately located and its depth and lateral position can be determined.

[0046] As a further optional embodiment, after the step of obtaining the pile foundation fluctuation signal, the method further includes the following steps: Performing wavelet transform noise reduction processing on the pile foundation fluctuation signal; The wavelet transform denoising process is as follows:

[0047]

[0048]

[0049] in, j is the number of wavelet decomposition layers, For the j Layer wavelet decomposition scaling coefficient, For the j −1-layer wavelet decomposition scaling coefficient, For the j Layer decomposition coefficient, For the j −1 layer decomposition coefficient, For the j Layer wavelet coefficients, is the sequence number of the sampling point in the discrete time series, is the transform coefficient index of discrete wavelet transform, is the reflection coefficient of the filter, is the reflection coefficient of the filter, is the filter coefficient of the low-pass filter, is the filter coefficient of the high-pass filter.

[0050] As a further optional embodiment, after obtaining the pile foundation fluctuation signal, the method further includes performing wavelet transform noise reduction processing on the fluctuation signal. Wavelet transform is a multi-resolution analysis technology that can effectively separate different scale components of the signal, thereby removing noise. In this embodiment, the pile foundation fluctuation signal is subjected to noise reduction by wavelet transform, thereby improving the accuracy of subsequent analysis.

[0051] Specifically, the original pile foundation vibration signal is transformed by wavelet, and the signal is decomposed into different scales and frequency bands using appropriate wavelet functions (such as Daubechies wavelet, Symlet wavelet, etc.). This process can be achieved by multi-level wavelet decomposition, which usually includes multiple decomposition levels to capture the characteristics of the signal in different frequency ranges.

[0052] Wavelet transform decomposes the signal through a recursive filtering process and calculates the approximate coefficients (low-frequency components) and detail coefficients (high-frequency components) respectively. The specific decomposition formula is as follows: The j-th level decomposition scale coefficient

[0053]

[0054] in, is the filter coefficient of the low-pass filter, For the j −1 layer decomposition coefficient, is the transform coefficient index of discrete wavelet transform, is the sequence number of the sampling point in the discrete time series.

[0055] The j-th layer wavelet coefficients :

[0056] in, is the reflection coefficient of the filter, For the j −1 layer decomposition coefficient, is the transform coefficient index of discrete wavelet transform.

[0057] After wavelet decomposition, we retain the low-frequency components (approximate coefficients) of the signal and process the high-frequency components (detail coefficients). To reduce noise, we can perform threshold processing on the high-frequency detail coefficients to remove the noise. The threshold method can be a soft threshold or a hard threshold method, which is determined according to the type of noise and the characteristics of the signal.

[0058] The specific recovery process is as follows:

[0059] in, is the filter coefficient of the low-pass filter, is the filter coefficient of the high-pass filter.

[0060] After denoising, the signal is reconstructed using the inverse wavelet transform. This step combines the denoised approximate coefficients with the processed detail coefficients to obtain a clear denoised signal. This signal will serve as the basis for subsequent analysis to ensure that in the subsequent wave field separation and damage location steps, the interference of the wave signal noise on the analysis results is effectively suppressed.

[0061] Signal denoising helps eliminate irrelevant signals caused by sensor noise or environmental interference, making subsequent wavefield separation and damage identification more accurate. Through the multi-resolution characteristics of wavelet transform, we can analyze signals at different scales to further improve the sensitivity and accuracy of detection.

[0062] As a further optional embodiment, the step of performing wave field separation on the pile foundation fluctuation signal to obtain the wave field signal characteristics of the pile foundation fluctuation signal specifically includes: Converting the pile foundation vibration signal into frequency domain and wave number domain; For the converted pile foundation vibration signal, the positive and negative wave fields are extracted through filters to obtain the upgoing wave and the downgoing wave; Performing a two-dimensional inverse Fourier transform on the upgoing wave and the downgoing wave to obtain upgoing wavefield data and downgoing wavefield data.

[0063] In this step, the original pile foundation vibration signal is first converted from the time domain to the frequency domain and wave number domain in order to separate the different wave field components in the signal. The frequency domain representation of the signal can be achieved using Fourier transform or other spectrum analysis methods.

[0064] Frequency domain conversion: Through Fourier transform, the spectrum representation of the signal is obtained and the frequency components of the signal are analyzed.

[0065] Wavenumber domain conversion: Through wavenumber transformation (such as the application of Fourier transform in the wavenumber domain), the signal is expressed in the form of a wavenumber function, thereby separating the wave fields in different directions.

[0066] In the wave number domain, by applying specific filters, positive waves and negative waves can be separated. Positive waves and negative waves represent the wave signals that are emitted from the pile foundation and propagate in all directions. By selecting appropriate filters, upgoing waves (positive waves) and downgoing waves (negative waves) can be effectively extracted.

[0067] Upgoing wave (positive wave): The signal is transmitted from the pile foundation to the surface and propagates upward, usually corresponding to the component with positive wave number.

[0068] Downward wave (negative wave): The signal propagates from the surface to the inside of the pile foundation, usually corresponding to the negative wave number component.

[0069] The filter can be designed as a bandpass filter, and the appropriate frequency range and wavenumber range can be selected to ensure that both upgoing and downgoing waves are effectively extracted. For example, a simplified filter is used to extract positive and negative waves: Upgoing wave extraction: Select the spectrum part in the positive wave number interval to extract the upgoing wave signal.

[0070] Downward wave extraction: Select the spectrum part in the negative wave number interval to extract the downward wave signal.

[0071] Once the frequency domain information of the upgoing and downgoing waves is extracted, we can convert it from the frequency domain and wavenumber domain back to the time domain through a two-dimensional inverse Fourier transform to obtain the upgoing and downgoing wavefield data:

[0072]

[0073] in and They are the time domain data of the upgoing and downgoing wave fields respectively.

[0074] As a further optional embodiment, the step of performing a combined analysis of wave energy and peak value on the wave field signal characteristics to determine the local damage position of the pile foundation specifically includes: Determining a reflection signal coefficient at each position according to the upgoing wavefield data and the downgoing wavefield data; Determining the Z-axis coordinate of the local damage position of the pile foundation according to the wave number and depth of the upgoing wavefield data and the downgoing wavefield data; According to the local reflection signal enhancement coefficient, the X-axis coordinate of the local damage position of the pile foundation is determined; The local damage position of the pile foundation is determined according to the Z-axis coordinate and the X-axis coordinate.

[0075] In this embodiment, the wave field signal characteristic analysis step in the pile foundation damage identification method is further optimized. By calculating the reflection signal coefficient of the upgoing wave and the downgoing wave data, combined with the wave number and depth information, the local damage position of the pile foundation is accurately determined. Specifically: According to the upgoing wave field data and the downgoing wave field data, the reflection signal coefficient at each position is calculated. The reflection signal coefficient reflects the reflection of the wave when it is affected by obstacles or inhomogeneous media during propagation. By calculating the reflection signal coefficient, the intensity of the wave signal reflected at different positions can be identified, and then the possible damage area inside the pile foundation can be determined.

[0076] The Z-axis coordinate of the local damage position of the pile foundation is determined based on the wave number (kz) and depth (z) of the upgoing wave field data and the downgoing wave field data. The wave number and depth information can help determine the path and reflection characteristics of wave propagation, thereby inferring the depth position of the damage.

[0077] After determining the depth of the damage (Z-axis coordinate), the X-axis coordinate of the pile foundation damage position is further determined based on the local reflection signal enhancement coefficient. The reflection signal enhancement coefficient reflects the degree to which the signal is reflected and amplified by the local damage area during propagation. By calculating the enhancement coefficients at different positions, the specific location of the damage can be determined.

[0078] By analyzing the enhancement factor ratios of all column data, the area with the largest reflection signal can be located, and then the X-axis coordinate of the damage can be determined.

[0079] Once the X-axis and Z-axis coordinates are determined by the reflection signal coefficient and the reflection signal enhancement coefficient, the local damage position of the pile foundation can be determined by combining these two coordinates. The determination of the damage position is of great significance for the repair and reinforcement of the pile foundation.

[0080] This embodiment further improves the accuracy of pile foundation damage identification by combining wave energy, peak analysis and reflection signal coefficient calculation. Through the change of wave number and depth, and the analysis of local reflection signal enhancement coefficient, the depth and lateral position of the damage can be accurately located. This method can not only effectively identify pile foundation damage, but also provide a scientific basis for pile foundation maintenance and reinforcement, and has high practical value.

[0081] As a further optional embodiment, the step of determining the Z-axis coordinate of the local damage position of the pile foundation according to the wave number and depth of the upgoing wavefield data and the downgoing wavefield data specifically includes: Determining the wavefield components and reflected wave signal coefficients at each position according to the wavenumber and depth of the upgoing wavefield data and the downgoing wavefield data; Determining a wave number abnormal change point based on the wave field component and the reflected wave signal coefficient; According to the abnormal wave number change point, the Z-axis coordinate of the local damage position of the pile foundation is determined.

[0082] In this embodiment, the Z-axis coordinate determination step in the pile foundation damage location identification method is further optimized. The specific steps include: determining the Z-axis coordinate of the damage location based on the wave number and depth information of the upgoing wave field data and the downgoing wave field data, combined with the wave field component and the reflected wave signal coefficient. The key to this method is to accurately locate the damage depth inside the pile foundation through the analysis of abnormal changes in the wave number.

[0083] First, it is necessary to obtain the wave field data of the upgoing and downgoing waves, and calculate the wave field components at each position based on these data. These wave field components reflect the characteristics of the wave during propagation in the pile foundation, including information such as the amplitude and phase of the wave.

[0084] By calculating the wave field components, the wave characteristics at different depths can be obtained. Furthermore, the calculation of the reflected wave signal coefficient can reveal the reflection intensity of the wave when it propagates inside the pile foundation, helping to identify damage.

[0085] Based on the obtained wave field components and reflected wave signal coefficients, the variation characteristics of the wave number are further analyzed. The wave number is an important indicator of wave propagation characteristics, which may undergo abnormal changes in the damaged area. Usually, the wave propagation path in the damaged area will be affected by medium inhomogeneity or obstacles, resulting in abnormal changes in the wave number.

[0086] Abnormal change points of wave number usually indicate the existence of structural defects or inhomogeneous media. In this embodiment, by detecting the change trend of the wave number, these abnormal change points can be determined, thereby inferring possible damage locations.

[0087] Method for identifying abnormal wave number change points: By calculating the wave number kz at different positions, the wave number distribution can be obtained.

[0088] Compare the changes in wave number distribution and identify the points of abnormal wave number changes, that is, the places where the wave number changes sharply.

[0089] The depth position corresponding to the abnormal change point is the candidate area of ​​the damage location.

[0090] After identifying the abnormal change points of the wave number, the Z-axis coordinates of the local damage positions of the pile foundation are further determined based on these abnormal change points. The Z-axis coordinates of the damage refer to the depth position of the damage inside the pile foundation.

[0091] Method for determining the Z-axis coordinate of the damage location: The location of the damage in the pile foundation can be inferred based on the location of the abnormal wave number change point.

[0092] The Z-axis coordinate of the abnormal point is the depth of the damage.

[0093] The accuracy of the damage depth can be verified by further time domain and frequency domain analysis.

[0094] Through the above steps, this embodiment provides a method for calculating the wave field components and reflected wave signal coefficients based on upgoing wave and downgoing wave data, and combined with the identification of abnormal wave number change points, the Z-axis coordinate of the pile foundation damage can be accurately determined. This method has high positioning accuracy, can effectively identify the depth damage of the pile foundation, and can realize automated and efficient damage detection in actual engineering.

[0095] As a further optional embodiment, the wave field component is obtained by:

[0096]

[0097] in, is the wave field component, is the upgoing wave field data, is the time window function, is the reference depth position, is the propagation speed of the wave; The reflected wave signal coefficient is obtained by the following method:

[0098] in, is the reflection wave signal coefficient at the Zth depth position, It is the downlink wave field data.

[0099] This embodiment describes in detail the calculation method of the wave field component and the reflected wave signal coefficient, which is used to further accurately determine the location of the pile foundation damage. The calculation of the wave field component can accurately describe the propagation characteristics of the wave signal, while the reflected wave signal coefficient helps to evaluate the intensity of the wave signal reflected in the pile foundation and provide a basis for damage location.

[0100] Wave field components The upgoing wave field data and time window functions The calculation expression is used to describe the wave characteristics at a specific position Z, a specific wave number kz and a frequency ω.

[0101] The calculation formula of wave field components is:

[0102] in, is the wave field component, which represents the signal characteristics at the z position and kz wave number. It is the upgoing wave field data, which means the wave data of the signal propagating from the surface of the pile foundation to the bottom. is a time window function, which is used to limit the time range of the signal and enhance the local characteristics of the signal. For the reference depth position, the surface depth of the pile foundation is usually selected as the reference. is the wave propagation speed.

[0103] The specific form of the time window is:

[0104] Among them, Dr is the length of the window.

[0105] The wave field components calculated by the above integrals describe the propagation characteristics of waves at different depths and wave numbers, and provide detailed information about the wave signal.

[0106] The reflected wave signal coefficient is used to describe the reflection intensity of the signal when it propagates inside the pile foundation. By comparing the wave field data of the upgoing wave and the downgoing wave, the reflected wave signal coefficient can be estimated, thereby revealing the reflection characteristics inside the pile foundation. The calculation formula of the reflected wave signal coefficient is as follows:

[0107] in, is the reflected wave signal coefficient at the Zth depth position, which describes the intensity of the reflected wave signal. It is the downlink wavefield data, which represents the reflected wave signal returning to the surface from below.

[0108] The calculation of the reflected wave signal coefficient can analyze the reflection intensity of the wave signal at different depths by integrating the ratio of the upgoing wave and the downgoing wave data. The reflected wave signal coefficient is crucial for damage identification because the reflection of the wave in the damaged area is usually strong. By calculating the change of the reflected wave signal coefficient, the location of the damage can be effectively determined.

[0109] This embodiment provides a method for calculating the wave field components and the reflected wave signal coefficients, and can achieve high-precision identification of pile foundation damage by accurately analyzing the fluctuation signals of the upgoing and downgoing waves. This method has important practical significance for damage monitoring of complex pile foundation structures and can effectively improve the accuracy and reliability of damage identification.

[0110] As a further optional embodiment, the local reflection signal enhancement coefficient is obtained by:

[0111] in, M and N is the number of grouping columns, is the local reflection signal enhancement coefficient, which indicates the reflection wave comparison between different groups. For Z Position i Column sensor data, For Z Position j Column sensor data.

[0112] In this embodiment, the local reflection signal enhancement coefficient k is used to evaluate the reflection wave intensity comparison between different positions or different sensor groups, thereby helping to determine the precise location of the pile foundation damage. By calculating the reflection signal enhancement coefficient for the data of multiple sensor columns, the reflection characteristics of the local damage area can be identified, further improving the accuracy of damage detection.

[0113] The local reflection signal enhancement coefficient k is obtained by comparing the reflection wave signal strength between different columns of sensor data. It provides an important basis for the location of pile foundation damage. Through this coefficient, it can be revealed which areas have stronger reflection waves, and then the possible damage location can be inferred.

[0114] The calculation formula of the local reflection signal enhancement coefficient is:

[0115] in, M and N is the number of grouping columns. The specific value depends on the sensor configuration when actually collecting data. is the local reflection signal enhancement coefficient, which indicates the contrast of reflection wave intensity between different groups. The location with a larger coefficient usually means that the reflection of the wave is stronger and there may be damage. For Z Position i A column of sensor data, indicating the response intensity of the sensor to the reflected wave. is the j-th column reflected wave signal coefficient at position Z.

[0116] In practical applications, it is assumed that multiple array sensors are arranged on the pile foundation, and the wave signals obtained by these sensors are analyzed according to different depths Z. The reflected wave signal coefficient of each row of sensors is calculated, and then the area where the reflected wave is enhanced is found by calculating the local reflected signal enhancement coefficient k, so as to infer the possible damage location of the pile foundation.

[0117] This embodiment provides an effective way to evaluate the damaged area of ​​the pile foundation by calculating the local reflection signal enhancement coefficient. By comparing the reflection wave signals of different sensor groups, the enhanced area of ​​the fluctuation signal can be accurately located, and then the damage location can be inferred. This method not only improves the accuracy of damage identification, but also provides valuable information for subsequent damage repair and prevention.

[0118] The following is a description of the pile foundation damage identification device provided by the present invention. As shown in FIG. x, the pile foundation damage identification device described below and the pile foundation damage identification method described above can be referred to each other.

[0119] A pile foundation damage identification device, comprising: A signal acquisition module 210 is used to acquire a pile foundation fluctuation signal, wherein the pile foundation fluctuation signal is acquired by an array sensor arranged on the surface of the pile foundation; The wave field separation module 220 is used to perform wave field separation on the pile foundation wave signal to obtain the wave field signal characteristics of the pile foundation wave signal; The damage determination module 230 is used to perform a combined analysis of wave energy and peak value on the wave field signal characteristics to determine the local damage position of the pile foundation.

[0120] Figure 3 An example of a physical structure diagram of an electronic device is shown in FIG. Figure 3 As shown, the electronic device may include: a processor 310, a communications interface 320, a memory 330 and a communication bus 340, wherein the processor 310, the communications interface 320 and the memory 330 communicate with each other through the communication bus 340. The processor 310 may call the logic instructions in the memory 330 to execute the pile foundation damage identification method, which includes: Acquiring a pile foundation fluctuation signal, wherein the pile foundation fluctuation signal is acquired by an array sensor arranged on the surface of the pile foundation; Performing wave field separation on the pile foundation wave signal to obtain wave field signal characteristics of the pile foundation wave signal; The wave field signal characteristics are subjected to a combined analysis of wave energy and peak value to determine the local damage position of the pile foundation.

[0121] In addition, the logic instructions in the above-mentioned memory 330 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0122] On the other hand, the present invention further provides a computer program product, the computer program product comprising a computer program, the computer program can be stored in a non-transitory computer-readable storage medium, when the computer program is executed by a processor, the computer can execute the pile foundation damage identification method provided by the above methods, the method comprising: Acquiring a pile foundation fluctuation signal, wherein the pile foundation fluctuation signal is acquired by an array sensor arranged on the surface of the pile foundation; Performing wave field separation on the pile foundation wave signal to obtain wave field signal characteristics of the pile foundation wave signal; The wave field signal characteristics are subjected to a combined analysis of wave energy and peak value to determine the local damage position of the pile foundation.

[0123] In another aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method for identifying pile foundation damage provided by the above methods is implemented, and the method comprises: Acquiring a pile foundation fluctuation signal, wherein the pile foundation fluctuation signal is acquired by an array sensor arranged on the surface of the pile foundation; Performing wave field separation on the pile foundation wave signal to obtain wave field signal characteristics of the pile foundation wave signal; The wave field signal characteristics are subjected to a combined analysis of wave energy and peak value to determine the local damage position of the pile foundation.

[0124] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0125] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for identifying pile foundation damage, characterized in that: include: Acquiring a pile foundation fluctuation signal, wherein the pile foundation fluctuation signal is acquired by an array sensor arranged on the surface of the pile foundation; Performing wave field separation on the pile foundation wave signal to obtain wave field signal characteristics of the pile foundation wave signal; The wave field signal characteristics are subjected to a combined analysis of wave energy and peak value to determine the local damage position of the pile foundation.

2. The method for identifying pile foundation damage according to claim 1, characterized in that: After the step of obtaining the pile foundation fluctuation signal, the method further comprises the following steps: Performing wavelet transform noise reduction processing on the pile foundation fluctuation signal; The wavelet transform denoising process is as follows: in, j is the number of wavelet decomposition layers, For the j Layer wavelet decomposition scaling coefficient, For the j −1-layer wavelet decomposition scaling coefficient, For the j Layer decomposition coefficient, For the j −1 layer decomposition coefficient, For the j Layer wavelet coefficients, is the sequence number of the sampling point in the discrete time series, is the transform coefficient index of discrete wavelet transform, is the reflection coefficient of the filter, is the reflection coefficient of the filter, is the filter coefficient of the low-pass filter, is the filter coefficient of the high-pass filter.

3. The method for identifying pile foundation damage according to claim 1, characterized in that: The step of performing wave field separation on the pile foundation fluctuation signal to obtain the wave field signal characteristics of the pile foundation fluctuation signal specifically includes: Converting the pile foundation vibration signal into frequency domain and wave number domain; For the converted pile foundation vibration signal, the positive and negative wave fields are extracted through filters to obtain the upgoing wave and the downgoing wave; Performing a two-dimensional inverse Fourier transform on the upgoing wave and the downgoing wave to obtain upgoing wavefield data and downgoing wavefield data.

4. The method for identifying pile foundation damage according to claim 3, characterized in that: The step of performing a combined analysis of wave energy and peak value on the wave field signal characteristics to determine the local damage position of the pile foundation specifically includes: Determining a reflection signal coefficient at each position according to the upgoing wavefield data and the downgoing wavefield data; Determining the Z-axis coordinate of the local damage position of the pile foundation according to the wave number and depth of the upgoing wavefield data and the downgoing wavefield data; According to the local reflection signal enhancement coefficient, the X-axis coordinate of the local damage position of the pile foundation is determined; The local damage position of the pile foundation is determined according to the Z-axis coordinate and the X-axis coordinate.

5. The method for identifying pile foundation damage according to claim 4, characterized in that: The step of determining the Z-axis coordinate of the local damage position of the pile foundation according to the wave number and depth of the upgoing wave field data and the downgoing wave field data specifically includes: Determining the wavefield components and reflected wave signal coefficients at each position according to the wavenumber and depth of the upgoing wavefield data and the downgoing wavefield data; Determining a wave number abnormal change point based on the wave field component and the reflected wave signal coefficient; According to the abnormal wave number change point, the Z-axis coordinate of the local damage position of the pile foundation is determined.

6. The method for identifying pile foundation damage according to claim 5, characterized in that: The wave field components are obtained in the following way: in, is the wave field component, is the upgoing wave field data, is the time window function, is the reference depth position, is the propagation speed of the wave; The reflected wave signal coefficient is obtained by the following method: in, is the reflection wave signal coefficient at the Zth depth position, It is the downlink wave field data.

7. The method for identifying pile foundation damage according to claim 6, characterized in that: The local reflection signal enhancement coefficient is obtained by the following method: in, M and N is the number of grouping columns, is the local reflection signal enhancement coefficient, which indicates the reflection wave comparison between different groups. For Z Position i Column sensor data, For Z Position j Column reflection wave signal coefficient.

8. A pile foundation damage identification device, characterized in that: include: A signal acquisition module, used to acquire a pile foundation fluctuation signal, wherein the pile foundation fluctuation signal is acquired by an array sensor arranged on the surface of the pile foundation; A wave field separation module is used to perform wave field separation on the pile foundation wave signal to obtain wave field signal characteristics of the pile foundation wave signal; The damage determination module is used to perform a combined analysis of wave energy and peak value on the wave field signal characteristics to determine the local damage position of the pile foundation.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the method for identifying pile foundation damage according to any one of claims 1 to 7 is implemented.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method for identifying pile foundation damage according to any one of claims 1 to 7 is implemented.

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