CN115450268B - Supporting disc pile detection device and method - Google Patents
Supporting disc pile detection device and method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000001514 detection method Methods 0.000 title claims abstract description 23
- 238000005259 measurement Methods 0.000 claims abstract description 45
- 239000002689 soil Substances 0.000 claims abstract description 12
- 230000005284 excitation Effects 0.000 claims description 26
- 230000007547 defect Effects 0.000 claims description 14
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/48—Piles varying in construction along their length, i.e. along the body between head and shoe, e.g. made of different materials along their length
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/10—Miscellaneous comprising sensor means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
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Abstract
The application discloses a device and a method for detecting a support disc pile, wherein the method comprises the following steps: exciting the pile body center of the support disc pile at least once, and receiving a stress wave signal from a pile body detector and a stress wave scattering signal from a measurement detector; cross-correlating and superposing stress wave signals and stress wave scattering signals to obtain a single-channel measurement superposition record of the target direction; calculating based on the supporting disc depth and the soil speed of the supporting disc pile to obtain the absolute time of peak pickup; calculating based on absolute time, stress wave scattering signals and single-channel measurement superposition records to obtain peak point amplitude of a target direction in a time window; and calculating to obtain a calculated variance based on the peak point amplitude of the same depth, and determining whether the pile body is extruded and expanded completely by comparing the calculated variance with the theoretical variance. Thereby realizing the piling effect of the nondestructive test support disc pile and being widely applied to the field of support disc pile detection.
Description
Technical Field
The application relates to the field of supporting disc pile detection, in particular to a supporting disc pile detection device and method.
Background
Compared with the common constant-diameter pile, the support disc pile has the advantages that the vertical bearing capacity, the horizontal bearing capacity and the bending resistance are obviously improved, and meanwhile, the use of pile body materials is reduced. With the increasing maturity of the construction technology of the support disc pile, the support disc pile is widely applied in engineering. The technology for detecting the forming effect of the support disc pile mainly comprises a thermal anomaly detection method, a core drilling method and the like, but the detection effect, the detection efficiency and the economy are not ideal, even the support disc pile is possibly damaged to detect the effect, the pile forming effect of the support disc pile is difficult to accurately evaluate due to the defect of a reliable and efficient detection technology, and the large-scale popularization and application of the support disc pile technology are limited.
Disclosure of Invention
In view of the above, the embodiment of the application provides a device and a method for detecting a supporting disc pile, thereby realizing the pile forming effect of nondestructive detection of the supporting disc pile.
One aspect of the present application provides a supporting disc pile detection apparatus, including: supporting disc piles; the measuring detectors are used for collecting stress wave scattering signals of the squeezed and expanded parts of the support disc piles, and the stress wave scattering signals are arranged towards a target direction at the edge of a pile body of the support disc piles, wherein each target direction comprises the same number of measuring detectors, the target direction comprises a first direction, a second direction, a third direction and a fourth direction, and the first direction, the second direction, the third direction and the fourth direction are mutually perpendicular; and the pile body detector is used for collecting stress wave signals of the pile body of the support disc pile and is arranged in the center of the pile body of the support disc pile.
The application further provides a method for detecting the support disc pile, which comprises the following steps: exciting the pile body center of the support disc pile at least once, and receiving a stress wave signal from the pile body detector and a stress wave scattering signal from the measurement detector; cross-correlating and superposing the stress wave signal and the stress wave scattering signal to obtain a single-channel measurement superposition record of the target direction; calculating based on the supporting disc depth and the soil mass speed of the supporting disc pile to obtain the absolute time of peak value pickup; calculating based on the absolute time, the stress wave scattering signal and the single-channel measurement superposition record to obtain peak point amplitude of the target direction in a time window; and calculating to obtain a calculated variance based on the peak point amplitude of the same depth, and determining whether the pile body is extruded and expanded completely by comparing the calculated variance with the theoretical variance.
According to some embodiments of the application, the exciting the pile body center of the disc pile at least once comprises: and releasing the excitation device to the position of the central surface of the pile body at least once at the same height so that the pile body of the support disc pile excites elastic waves, wherein the excitation device is used for vibrating the support disc pile.
According to some embodiments of the present application, after the exciting the pile body center of the disc pile at least once and receiving the stress wave signal from the pile body detector and the stress wave scattering signal from the measurement detector, the method further comprises the steps of: vertically superposing the stress wave signals; vertically superposing the stress wave scattering signals; wherein, the formula of vertically superposing the stress wave signals is as follows:wherein GZ s Is a stress wave signal after vertical superposition, n is the excitation frequency, GZ i The stress wave signals acquired after the ith excitation are obtained; the formula for vertically superposing the stress wave scattering signals is as follows: />Wherein, GM s Is a stress wave scattering signal after vertical superposition, n is the number of excitation times, GM i And (3) scattering signals for the stress wave acquired after the ith excitation.
According to some embodiments of the application, the step of cross-correlating the superimposed stress wave signal and the scattered stress wave signal to obtain a single-pass measurement superimposed record of the target direction comprises: the calculation formula of the single-channel measurement superposition record of the target direction is as follows:wherein R (t, t) n )＝E[GZ s (t)GM s (t n )]T is the time for recording the signal of the pile body detector, n is the label of the measuring detector, t n For recording the time of the signal of the nth measuring detector, a is the number of the measuring detectors contained in any one of the target directions, M +x Superimposed recording for single-pass measurement of said first direction, M -x Superimposed recordings for a single measurement of said second direction,M +y superimposed recording for said third direction single-pass measurement, M -y And superposing records for the single-channel measurement in the fourth direction.
According to some embodiments of the present application, in the step of calculating the absolute time of peak pickup based on the tray depth and the soil speed of the tray pile, the absolute time is expressed as:wherein d n And v is the longitudinal wave speed of the underground soil body, and is the depth of the nth squeezing and expanding part of the support disc pile.
According to some embodiments of the application, the calculating based on the absolute time, the stress wave scattering signal and the single-pass measurement superposition record, to obtain peak point amplitude of the target direction within a time window, includes: calculating according to the stress wave scattering signal to obtain an analysis signal; calculating according to the analysis signal to obtain instantaneous frequency; the calculation formula of the analytic signal is as follows:wherein c i (t n ) To resolve the signal, GM si (t n ) For the ith stress wave scattering signal j is a coefficient,>for the ith GM si (t n ) Hilbert transform Spectrum, t n Absolute time for peak pickup; the calculation formula of the instantaneous frequency is as follows: />Wherein Ω i (t n ) For the i-th measuring detector's instantaneous frequency, t n Is the absolute time.
According to some embodiments of the application, the calculating based on the absolute time, the stress wave scattering signal and the single-pass measurement superposition record, to obtain peak point amplitude of the target direction in a time window, further comprises: root of Chinese characterCalculating according to the instantaneous frequency to obtain a corresponding time window; acquiring the maximum amplitude value of the target direction in the time window as peak point amplitude based on the single-channel measurement superposition record; the formula for calculating the corresponding time window according to the instantaneous frequency is as follows:wherein Ω i (t n ) The instantaneous frequency of the detector is measured for the ith.
According to some embodiments of the present application, the calculating the calculated variance based on the peak point amplitude of the same depth, and comparing the calculated variance with the theoretical variance, determining whether the pile body is complete includes: calculating according to peak point amplitudes of the same depth to obtain a calculated variance; wherein the calculation formula for calculating the variance is:wherein n is the nth squeeze-expansion position of the support disc pile, and j is the target direction, including +x, -x, +y and-y directions.
According to some embodiments of the present application, the calculating the peak point amplitude based on the same depth to obtain a calculated variance, and determining whether the pile body is complete by comparing the calculated variance with a theoretical variance, further includes: when the calculated variance is larger than the theoretical variance, judging that a defect exists at the squeezing and expanding position of the depth; and when the calculated variance is equal to or smaller than the theoretical variance, judging that the depth is complete at the squeeze-expansion position.
According to the embodiment of the application, the measuring detector is arranged at the extrusion expansion position of the support disc pile to collect stress wave scattering signals, and the pile body detector is arranged at the pile body center of the pile body of the support disc pile to collect stress wave signals. The stress wave signals and the stress wave scattering signals are collected through exciting the pile body center of the support disc pile, the stress wave signals and the stress wave scattering signals are overlapped, single-channel measurement overlapping records of four target directions are obtained, and the influence of offset is eliminated; calculating based on the supporting disc depth and the soil speed of the supporting disc pile to obtain the absolute time of peak pickup; calculating based on absolute time, stress wave scattering signals and single-channel measurement superposition records to obtain peak point amplitude of a target direction in a time window; and calculating to obtain a calculated variance based on the peak point amplitude of the same depth, and determining whether the pile body is extruded and expanded completely by comparing the calculated variance with the theoretical variance. The method has the advantages that the collected stress wave scattering signals at the extruding and expanding supporting disc are utilized to evaluate the supporting disc pile forming effect of the supporting disc pile, the supporting disc pile is not required to be damaged in the mode, meanwhile, the stress wave scattering signals can be utilized to collect more abundant information, and therefore reliability of pile forming effect detection is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic top view of a supporting pile detection device according to an embodiment of the present application;
FIG. 2 is a schematic cross-sectional view of a supporting pile detection device according to an embodiment of the present application;
FIG. 3 is a flow chart of steps of a method for detecting a pile of a support disc according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a defect at a pile body squeeze-expansion position of a support disc pile according to an embodiment of the present application;
fig. 5 is a diagram showing the interpretation of the complete signal and the defect signal at the expansion part of the disc pile in fig. 4.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
Referring to fig. 1 and 2, fig. 1 is a schematic top view of a supporting pile detection apparatus according to an embodiment of the present application, and fig. 2 is a schematic cross-sectional view of a supporting pile detection apparatus according to an embodiment of the present application.
Specifically, the supporting disc pile detection device comprises a supporting disc pile, a measuring detector and a pile body detector. The measuring detector is used for collecting stress wave scattering signals of the squeezed and expanded part of the support disc pile, and the stress wave scattering signals are arranged from the edge of the pile body of the support disc pile to the target direction. In practical application, the corresponding arrangement can be carried out according to the direction of the extrusion expansion of the known support disc pile. In a specific embodiment, because the measurable position of the pile body is limited, a certain offset distance is adopted for measurement, in theory, the larger the number of measurement channels is, the larger the offset distance is, the more information can be obtained, but in consideration of actual operation and the signal to noise ratio problem of a large offset distance signal, the distance between channels can be set to be 1 meter, 8 channels in each target direction, namely, 1-8 channels are arranged in the first direction, 9-16 channels are arranged in the second direction, 17-24 channels are arranged in the third direction, 25-32 channels are arranged in the fourth direction, and 32 channels are arranged in total. Further, in the process of installing the measuring detector, in order to ensure the signal coupling effect, the measuring detector can be installed into a firm soil body by adopting a long tail cone and butter. The pile body detector is used for collecting stress wave signals of the pile body of the support disc pile and is arranged at the center of the pile body. Further, a seismometer is connected to the detector, and the correlation data detected by the measuring detector and the pile body detector is recorded by the seismometer. In a specific embodiment, the pile body detector and the measuring detector are the same type of detector, and a moving coil type velocity detector is generally used, for example: 28Hz broadband high-sensitivity speed detector.
Referring to fig. 3, fig. 3 is a flowchart of a method for detecting a pile of a support disc according to an embodiment of the present application. The method for detecting the supporting disc piles is applied to a supporting disc pile detection device.
And S100, exciting the pile body center of the support disc pile at least once, and receiving the stress wave signal from the pile body detector and the stress wave scattering signal from the measuring detector.
Specifically, the excitation device is released at least once at the same height at the center surface position of the pile body, and typically, for improving the detection accuracy, the excitation device is released 8-10 times; for example, the excitation device may be a steel ball. And the pile body detector acquires a corresponding stress wave signal, and the measuring detector acquires a corresponding stress wave scattering signal.
And step S200, cross-correlating and superposing stress wave signals and stress wave scattering signals to obtain a single-channel measurement superposition record of the target direction.
Before proceeding to step S200, the method further comprises the steps of:
the formula of the vertical superposition stress wave signal is:wherein GZ s Is a stress wave signal after vertical superposition, n is the excitation frequency, GZ i The stress wave signals acquired after the ith excitation are obtained;
the formula of the vertical superposition stress wave scattering signal is:wherein, GM s Is a stress wave scattering signal after vertical superposition, n is the number of excitation times, GM i Is the stress wave scattering signal acquired after the ith excitation.
Specifically, the stress wave signal is embodied as: GZ (gZ) i ＝G(t)+N GZi (t) the stress wave scattering signal is embodied as: GM (GM) i ＝G(t)+N GMi (t), wherein t is the recording time, G (t) is the effective signal, N GZi (t) is the noise signal in the stress wave signal in the ith excitation, N GMi And (t) is a noise signal in the stress wave scattering signal in the ith excitation, and it can be seen that the signal to noise ratio can be improved and the effective wave energy can be increased by vertically superposing the stress wave signal and the stress wave scattering signal which are excited for multiple times. Therefore, the stress wave signals and the stress wave scattering signals are vertically overlapped respectively, and the formula of the vertical overlapping of the stress wave signals is as follows:wherein GZ s Is a stress wave signal after vertical superposition, n is the excitation frequency, GZ i The stress wave signals acquired after the ith excitation are obtained; the stress wave scattering signal superposition formula is +.>Wherein, GM s Is a stress wave scattering signal after vertical superposition, n is the number of excitation times, GM i Is the stress wave scattering signal acquired after the ith excitation.
Specifically, after the superposition of the stress wave signal and the superposition of the stress wave dispersion signal are completed, the operation of step S200 is performed: and cross-correlating the superimposed stress wave signals and the stress wave scattering signals, thereby obtaining single-channel measurement superimposed records of different target directions. The calculation formula of the single-channel measurement superposition record of the target direction is as follows:
wherein R (t, t) n )＝E[GZ s (t)GM s (t n )]T is the time for recording the signal of the pile body detector, n is the label of the measuring detector, t n For recording the time of the signal of the nth measuring detector, a is the number of measuring detectors contained in any one target direction, M +x Superimposed recording for single-pass measurement in first direction, M -x Superimposed recording for single-pass measurement in the second direction, M +y Superimposed recording for single-pass measurement in third direction, M -y The record is superimposed for a single measurement in the fourth direction. The pile body detectors arranged on the pile body can acquire stress wave signals of the pile body wave guide bodies, the measurement detectors arranged on the ground can acquire stress wave scattering signals of the squeezed and expanded positions of the support disc piles in different directions, and the stress wave scattering signals are subjected to cross-correlation superposition processing, so that the influence of offset can be eliminated, and the scattered wave signals of the squeezed and expanded positions are further extracted. Showing theFor example, assuming that each target direction includes 8 measuring detectors, then
And step S300, calculating based on the supporting disc depth and the soil mass speed of the supporting disc pile to obtain the absolute time of peak value pickup.
Specifically, the absolute time of peak pickup, i.e., the time domain signal position, is:wherein, the design depth of the support disc pile is d n I.e. d n The depth of the nth squeezing and expanding part of the support disc pile is v, and v is the longitudinal wave speed of the underground soil body.
And step S400, calculating based on absolute time, stress wave scattering signals and single-channel measurement superposition records to obtain the peak point amplitude of the target direction in the time window.
Specifically, the corresponding peak point amplitudes in different single-channel signals in the corresponding time window are picked up, and the specific mode for acquiring the time window is as follows: according to the stress wave scattering signal, an analysis signal is obtained by calculation, and the calculation formula is as follows:wherein c i (t n ) To resolve the signal, GM si (t n ) For the ith stress wave scattering signal j is a coefficient,>for the ith GM si (t n ) Hilbert transform Spectrum, t n Absolute time for peak pickup; the instantaneous frequency is calculated according to the analytic signal, and the formula is as follows: />Wherein Ω i (t n ) For the i-th measuring detector's instantaneous frequency, t n Is the absolute time. Thereby calculating the instantaneous frequency of the signal at the absolute time of picking up the peak. According to the instantaneous frequency, a corresponding time window is obtained by calculation, and the formula is as follows: />Wherein Ω i (t n ) Measuring the instantaneous frequency of the detector for the ith; based on the single-channel measurement superposition record, the maximum value of the amplitude in the target direction in the time window is obtained as the peak point amplitude, and the peak point amplitude is respectively recorded as follows:wherein +x, -x, +y, -y represent the first direction, the second direction, the third direction and the fourth direction respectively, and n represents the nth squeeze-expansion position of the support disc pile.
And S500, calculating to obtain a calculated variance based on the peak point amplitude of the same depth, and determining whether the pile body is extruded and expanded completely by comparing the calculated variance with the theoretical variance.
Specifically, the same depth point has 4-channel cross-correlation superposition records in +X, -X, +Y and-Y and 4 directions, and the variance isWherein n is the nth squeeze-expansion position of the support disc pile, j is the target direction, and the target direction comprises +x, -x, +y and-y directions. Theoretical error of +.>Wherein. n is the nth squeezing and expanding position of the support disc pile, and when the calculated variance is larger than the theoretical variance, the defect exists in the squeezing and expanding position of the depth; and when the calculated variance is equal to or smaller than the theoretical variance, judging that the depth expansion part is complete. Exemplary, when->Then the 1 st depth pinch-out is considered to be defective when +.>Then no defect is considered to exist at the expansion of depth 1. Further, by analysis->Calculating the average value of peak point amplitudes at the same depth, and obtaining a target direction lower than the average value as a maximum probability of defect existence, for example, when +.>Then the expansion part at the 1 st depth is considered to have defects, and the +.>Wherein the direction corresponding to the peak point amplitude below the average value is where the defect is most likely to exist. It should be noted that, theoretically, the variance value should be 0, but in practice, due to the influence of observation and squeeze-spread effects, there may still be a deviation in case of complete different directions, so the theoretical variance value +.>The theoretical variance can be defined as +.A.A practical embodiment is exemplified as the theoretical variance of the square of the maximum amplitude of the depth signal corresponding to the squeeze-spread>n is 5-10. Fig. 4 and fig. 5 provide an embodiment, fig. 4 is a schematic diagram of a defect at a pile body expansion position of a support disc pile provided by the embodiment, and fig. 5 is an explanatory comparison diagram of a complete expansion position and a defect signal in the embodiment, wherein in fig. 5, a 1 position represents the complete position signal, a 2 position represents the defect position signal, a complete position stress wave scattering signal is strong and regular, and a defect position stress wave scattering signal is weak and disordered.
In some alternative embodiments, the functions/acts noted in the block diagrams may occur out of the order noted in the operational illustrations. For example, two blocks shown in succession may in fact be executed substantially concurrently or the blocks may sometimes be executed in the reverse order, depending upon the functionality/acts involved. Furthermore, the embodiments presented and described in the flowcharts of the present application are provided by way of example in order to provide a more thorough understanding of the technology. The disclosed methods are not limited to the operations and logic flows presented herein. Alternative embodiments are contemplated in which the order of various operations is changed, and in which sub-operations described as part of a larger operation are performed independently.
Furthermore, while the application is described in the context of functional modules, it should be appreciated that, unless otherwise indicated, one or more of the described functions and/or features may be integrated in a single physical device and/or software module or one or more functions and/or features may be implemented in separate physical devices or software modules. It will also be appreciated that a detailed discussion of the actual implementation of each module is not necessary to an understanding of the present application. Rather, the actual implementation of the various functional modules in the apparatus disclosed herein will be apparent to those skilled in the art from consideration of their attributes, functions and internal relationships. Accordingly, one of ordinary skill in the art can implement the application as set forth in the claims without undue experimentation. It is also to be understood that the specific concepts disclosed are merely illustrative and are not intended to be limiting upon the scope of the application, which is to be defined in the appended claims and their full scope of equivalents.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the application, the scope of which is defined by the claims and their equivalents.
While the preferred embodiment of the present application has been described in detail, the present application is not limited to the embodiments described above, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present application, and these equivalent modifications or substitutions are included in the scope of the present application as defined in the appended claims.
Claims (10)
1. A branch disc pile detection device, characterized by comprising:
supporting disc piles;
the measuring detectors are used for collecting stress wave scattering signals of the squeezed and expanded parts of the support disc piles, and the stress wave scattering signals are arranged towards a target direction at the edge of a pile body of the support disc piles, wherein each target direction comprises the same number of measuring detectors, the target direction comprises a first direction, a second direction, a third direction and a fourth direction, and the first direction, the second direction, the third direction and the fourth direction are mutually perpendicular;
the pile body detector is used for collecting stress wave signals of the pile body of the support disc pile and is arranged in the center of the pile body of the support disc pile;
the supporting disc pile detection device is also used for exciting the pile body center of the supporting disc pile at least once and receiving the stress wave signal from the pile body detector and the stress wave scattering signal from the measuring detector; cross-correlating and superposing the stress wave signal and the stress wave scattering signal to obtain a single-channel measurement superposition record of the target direction; calculating based on the supporting disc depth and the soil mass speed of the supporting disc pile to obtain the absolute time of peak value pickup; calculating based on the absolute time, the stress wave scattering signal and the single-channel measurement superposition record to obtain peak point amplitude of the target direction in a time window; and calculating to obtain a calculated variance based on the peak point amplitude of the same depth, and determining whether the pile body is extruded and expanded completely by comparing the calculated variance with the theoretical variance.
2. A disc pile detection method applied to the disc pile detection device according to claim 1, comprising:
exciting the pile body center of the support disc pile at least once, and receiving a stress wave signal from the pile body detector and a stress wave scattering signal from the measurement detector;
cross-correlating and superposing the stress wave signal and the stress wave scattering signal to obtain a single-channel measurement superposition record of the target direction;
calculating based on the supporting disc depth and the soil mass speed of the supporting disc pile to obtain the absolute time of peak value pickup;
calculating based on the absolute time, the stress wave scattering signal and the single-channel measurement superposition record to obtain peak point amplitude of the target direction in a time window;
and calculating to obtain a calculated variance based on the peak point amplitude of the same depth, and determining whether the pile body is extruded and expanded completely by comparing the calculated variance with the theoretical variance.
3. A method of detecting a disc pile according to claim 2, wherein exciting the pile body centre of the disc pile at least once comprises:
and releasing the excitation device to the position of the central surface of the pile body at least once at the same height so that the pile body of the support disc pile excites elastic waves, wherein the excitation device is used for vibrating the support disc pile.
4. A method of detecting a disc pile according to claim 3, wherein the excitation of the pile body centre of the disc pile is at least once, and after receiving the stress wave signal from the pile body detector and the stress wave scattering signal from the measurement detector, further comprises the steps of:
vertically superposing the stress wave signals;
vertically superposing the stress wave scattering signals;
wherein, the formula of vertically superposing the stress wave signals is as follows:
wherein GZ s Is a stress wave signal after vertical superposition, n is the excitation frequency, GZ i The stress wave signals acquired after the ith excitation are obtained;
the formula for vertically superposing the stress wave scattering signals is as follows:
wherein, GM s Is a stress wave scattering signal after vertical superposition, n is the number of excitation times, GM i And (3) scattering signals for the stress wave acquired after the ith excitation.
5. The method of claim 4, wherein the step of cross-correlating the superimposed stress wave signal and the scattered stress wave signal to obtain a single-pass measurement superimposed record of the target direction comprises:
the calculation formula of the single-channel measurement superposition record of the target direction is as follows:
wherein R (t, t) n )＝E[GZ s (t)GM s (t n )]T is the time for recording the signal of the pile body detector, n is the label of the measuring detector, t n For recording the time of the signal of the nth measuring detector, a is the number of the measuring detectors contained in any one of the target directions, M +x Superimposed recording for single-pass measurement of said first direction, M -x Superimposed recording for single-pass measurement of said second direction, M +y Superimposed recording for said third direction single-pass measurement, M -y Superimposed recording for said single-pass measurement in the fourth direction E [ GZ ] s (t)GM s (t n )]To GZ s (t)GM s (t n ) And carrying out expected value operation.
6. The method for detecting a pile according to claim 5, wherein in the step of calculating an absolute time for peak pickup based on a depth of a pile and a soil mass velocity of the pile,
the absolute time formula is:
wherein d n The depth of the nth squeezing and expanding part of the support disc pile is v is the longitudinal wave of the underground soil bodySpeed.
7. The method for detecting a branch pile according to claim 6, wherein the calculating based on the absolute time, the stress wave scattering signal and the single-pass measurement superposition record to obtain the peak point amplitude of the target direction within a time window comprises:
calculating according to the stress wave scattering signal to obtain an analysis signal;
calculating according to the analysis signal to obtain instantaneous frequency;
the calculation formula of the analytic signal is as follows:
wherein c i (t n ) To resolve the signal, GM si (t n ) For the i-th stress wave scattering signal, j is a coefficient,for the ith GM si (t n ) Hilbert transform Spectrum, t n Absolute time for peak pickup;
the calculation formula of the instantaneous frequency is as follows:
wherein Ω i (t n ) For the i-th measuring detector's instantaneous frequency, t n Is the absolute time.
8. The method for detecting a branch pile according to claim 7, wherein the calculating based on the absolute time, the stress wave scattering signal and the single-pass measurement superposition record, to obtain the peak point amplitude of the target direction within a time window, further comprises:
calculating according to the instantaneous frequency to obtain a corresponding time window;
acquiring the maximum amplitude value of the target direction in the time window as peak point amplitude based on the single-channel measurement superposition record;
the formula for calculating the corresponding time window according to the instantaneous frequency is as follows:wherein Ω i (t n ) The instantaneous frequency of the detector is measured for the ith.
9. The method for detecting a pile-on-disc pile according to claim 8, wherein the step of calculating the calculated variance based on the peak point amplitudes at the same depth, and determining whether the pile body is complete by comparing the calculated variance with the theoretical variance, comprises:
calculating according to peak point amplitudes of the same depth to obtain a calculated variance;
wherein the calculation formula for calculating the variance is:
wherein n is the nth squeeze-expansion position of the support disc pile, j is the target direction, which comprises +x, -x, +y, -y directions,in order to increase the peak amplitude in the j target direction at the nth pinch-out, +.>For->And carrying out expected value operation.
10. The method for detecting a pile-on-disc according to claim 9, wherein the calculating the calculated variance based on the peak point amplitude of the same depth, and determining whether the pile body is complete by comparing the calculated variance with the theoretical variance, further comprises:
when the calculated variance is larger than the theoretical variance, judging that a defect exists at the squeezing and expanding position of the depth;
and when the calculated variance is equal to or smaller than the theoretical variance, judging that the depth is complete at the squeeze-expansion position.
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