CN111549833A - Foundation pile detection method and system and storage medium - Google Patents
Foundation pile detection method and system and storage medium Download PDFInfo
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- CN111549833A CN111549833A CN202010392454.3A CN202010392454A CN111549833A CN 111549833 A CN111549833 A CN 111549833A CN 202010392454 A CN202010392454 A CN 202010392454A CN 111549833 A CN111549833 A CN 111549833A
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Abstract
The invention relates to the technical field of foundation pile detection, and discloses a foundation pile detection method, a system and a storage medium, wherein the method comprises the steps of modeling various defects of a foundation pile in advance to reduce the section area of the foundation pile, and setting a mapping relation between the damage degree and the integrity coefficient of the foundation pile in a matching manner; actually measuring a pile top vibration speed time-domain curve graph of the foundation pile by adopting a low-strain reflection wave method to obtain a damage position of the foundation pile, calculating low-strain reflection wave power fingerprints with different damage degrees by adopting a foundation pile power problem analytical solution based on the damage position, obtaining an approximate function relation, calculating to obtain a foundation pile integrity coefficient eta, and obtaining a foundation pile damage level according to the integrity coefficient eta; the method effectively solves the problem of quantitative analysis of the damage degree of the foundation pile, and improves the accuracy and the practicability of the low-strain reflected wave detection method for identifying the damage of the foundation pile.
Description
Technical Field
The invention relates to the technical field of foundation pile detection, in particular to a foundation pile detection method, a foundation pile detection system and a storage medium.
Background
Foundation piles have been widely used in the field of civil engineering as a form of deep foundation structure. The foundation pile can transfer the self weight and the load of the upper structure to the stable soil layer contacted with the foundation pile, thereby greatly reducing the settlement of the foundation and the uneven settlement of the building. The foundation pile has the advantages of high bearing capacity, small settlement, strong shock resistance and the like, is widely applied in some areas with complex geological conditions, soft soil and multiple earthquakes, and has already obtained considerable effect.
Foundation piles can be divided into cast-in-place piles and precast piles according to the manufacturing process, wherein the cast-in-place piles are widely used, such as: bridge, highway, railway, high-rise building and other engineering. However, in the process of constructing and manufacturing foundation piles, due to the influence of factors such as construction technology, personnel operation, external conditions, material quality and the like, defects such as pile breakage, neck expansion, diameter reduction, segregation, mud inclusion, sediment, cavities and the like are easily caused, the defects are potential hazards of buildings and greatly influence the quality of the buildings, and once the quality of an upper structure cannot be loaded at the defect part, the buildings collapse and are seriously lost. Therefore, foundation pile detection is very important, and the quality of the building can be greatly improved only by timely detecting the defective pile and taking effective prevention and treatment measures.
Stress waves in the process of testing the foundation pile low-strain reflection wave method are influenced by the coupling effect of a pile-soil system and the damping of a pile body material in the propagation process, and the energy of the stress waves is gradually attenuated, however, the traditional analysis method of the low-strain reflection wave method needs a large amount of assumptions and fails to consider the coupling effect of the pile-soil system, the damping of the pile body material and the influence of a transverse inertia effect, and the defects of the concrete pile are difficult to quantitatively analyze in actual engineering.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a foundation pile detection method, which is used for solving the problems in the background technology.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention provides a foundation pile detection method, which comprises the following steps:
modeling various defects of the foundation pile in advance to reduce the section area of the foundation pile, and matching and setting a mapping relation between the damage degree and the integrity coefficient of the foundation pile;
actually measuring a pile top vibration speed time-domain curve graph of the foundation pile by adopting a low-strain reflection wave method;
calculating to obtain the damage position of the foundation pile according to the time domain curve graph, specifically:
identifying longitudinal wave velocity, incident wave crest and reflected wave crest occurrence time parameters of the foundation pile according to the time domain curve graph, and substituting the time parameters into a formula
Calculating to obtain the damage position, wherein D is the distance between the defect damage and the pile top, V is the longitudinal wave velocity of the foundation pile, and t2Time of occurrence of a defective reflected wave, t1The time of occurrence of the incident wave;
calculating low-strain reflected wave power fingerprints with different damage degrees by adopting a foundation pile power problem analysis method based on the damage position;
fitting an approximate function relation between the low-strain reflected wave power fingerprint and the integrity coefficient of the foundation pile by a least square method;
actually measuring a time-domain curve graph of the pile top vibration speed according to a low-strain reflection wave method to obtain an actually measured low-strain reflection wave power fingerprint, substituting the actually measured low-strain reflection wave power fingerprint into an approximate function relation, and calculating to obtain a foundation pile integrity coefficient eta;
and obtaining the damage grade of the foundation pile according to the integrity coefficient eta, wherein the grade comprises perfect, slight defect, obvious defect and broken pile.
Preferably, the low-strain reflected wave power fingerprint calculation method includes:
collecting defect reflected wave peak value in time-domain curve chart of pile top vibration speed of actually-measured foundation pile by low-strain reflected wave methodAdAnd the peak value A of the incident wave0；
Substituting into a formula:
and obtaining the low-strain reflected wave power fingerprint phi.
Preferably, the fitting of the approximate functional relation between the low-strain reflected wave dynamic fingerprint and the foundation pile integrity coefficient by the least square method specifically includes:
taking N complete coefficients η within a preset damage degree rangek(k＝1,2,3…N)；
The pile top dynamic response under different complete coefficients is calculated by adopting a foundation pile dynamic problem analytic solution considering the pile-soil coupling effect, and N incident wave peak values A are obtained0 kAnd the peak value A of the reflected waved kAnd calculating to obtain the low-strain reflected wave power fingerprint phi of N foundation pilesk(k＝1，2，…n)；
Based on the obtained N groups of data (η)k，φk) And fitting an approximate function relation between the low-strain reflected wave dynamic fingerprint and the integrity coefficient of the foundation pile by using a least square method.
Preferably, the approximate functional relationship is:
wherein
Is the undetermined coefficient of a sextic polynomial.
Preferably, the approximate functional relationship is:
η＝η(φ)＝η[φ(X1,X2)；X3,X4,X5…Xn]
wherein X1Is the peak of the defect reflection, X2Is the peak of the defect incident wave; x3,X4,X5…XnThe parameters are excitation parameters, foundation pile structure parameters and foundation parameters.
Preferably, the excitation parameters, the foundation pile structure parameters and the foundation parameters specifically include: one or more of the parameters of the amplitude of the exciting force, the pulse width, the equivalent radius of the foundation pile, the longitudinal wave velocity of the concrete of the foundation pile, the mass density of the concrete of the foundation pile, the material damping of the concrete of the foundation pile, the shear wave velocity of the soil layer and the mass density.
Preferably, the various defects of the foundation pile comprise one or more of a pile body necking defect, a pile body concrete segregation defect, a pile body mud clamping defect, a pile breaking defect and pile bottom sediment.
Preferably, the modeling of various defects of the foundation pile into the reduction of the cross-sectional area of the foundation pile in advance and the matching of the set mapping relationship between the damage degree and the integrity coefficient of the foundation pile specifically include:
substituting the area of the defect section and the section area of the pile body of the foundation pile into a formula:
wherein ZdIs the area of the defect cross-section, Z0The cross-sectional area of the pile body.
The present invention also provides a foundation pile detection system, including: the device comprises an excitation device, a sensor, an amplifier, a control processing device and a display device;
the excitation equipment applies excitation load to the end part of the foundation pile, receives the propagation speed of stress waves in the pile body through the sensor, amplifies signals received by the sensor through the amplifier and then sends the amplified signals into the control processing device for calculation and analysis to obtain reflected wave waveforms;
carrying out systematic analysis on the detected reflected wave oscillogram, and matching the waveform characteristics with the defect types to obtain the defects existing in the pile body
The excitation equipment comprises one or more of a hand hammer and a force rod and is used for applying proper excitation on the pile top;
the sensor comprises one or more of a speed sensor, an acceleration sensor and a displacement sensor and is used for collecting reflected wave signals;
the amplifier is a voltage amplifier and is used for providing amplification functions of high signal-to-noise ratio and high gain for reflected wave signals collected by the sensor;
the control processor is used for receiving data sent by the amplifier and executing the following steps:
modeling various defects of the foundation pile in advance to reduce the section area of the foundation pile, and matching and setting a mapping relation between the damage degree and the integrity coefficient of the foundation pile;
actually measuring a pile top vibration speed time-domain curve graph of the foundation pile by adopting a low-strain reflection wave method;
calculating to obtain the damage position of the foundation pile according to the time domain curve graph, specifically:
identifying longitudinal wave velocity, incident wave crest and reflected wave crest occurrence time parameters of the foundation pile according to the time domain curve graph, and substituting the time parameters into a formula
Calculating to obtain the damage position, wherein D is the distance between the defect damage and the pile top, V is the longitudinal wave velocity of the foundation pile, and t2Time of occurrence of a defective reflected wave, t1The time of occurrence of the incident wave;
calculating low-strain reflected wave power fingerprints with different damage degrees by adopting a foundation pile power problem analysis method based on the damage position;
fitting an approximate function relation between the low-strain reflected wave power fingerprint and the integrity coefficient of the foundation pile by a least square method;
actually measuring a time-domain curve graph of the pile top vibration speed according to a low-strain reflection wave method to obtain an actually measured low-strain reflection wave power fingerprint, substituting the actually measured low-strain reflection wave power fingerprint into an approximate function relation, and calculating to obtain a foundation pile integrity coefficient eta;
and obtaining the damage grade of the foundation pile according to the integrity coefficient eta, wherein the grade comprises perfect, slight defect, obvious defect and broken pile.
The present invention also provides a storage medium having stored thereon a computer program which, when being executed by a processor, performs the steps of the pile detection method as described above.
Compared with the prior art, the invention has the following beneficial effects:
the method combines a foundation pile power problem analysis solution considering the pile-soil coupling effect and a foundation pile dynamic measurement low-strain reflection wave method, establishes the quantitative relation between the foundation pile damage degree and the low-strain reflection wave power fingerprint, effectively solves the problem of quantitative analysis of the foundation pile damage degree, and improves the accuracy and the practicability of foundation pile damage identification.
Further salient features and significant advances with respect to the present invention over the prior art are described in further detail in the examples section.
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Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic structural diagram of a foundation pile detection system according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that certain names are used throughout the specification and claims to refer to particular components. It will be understood that one of ordinary skill in the art may refer to the same component by different names. The present specification and claims do not intend to distinguish between components that differ in name but not function. As used in the specification and claims of this application, the terms "comprises" and "comprising" are intended to be open-ended terms that should be interpreted as "including, but not limited to," or "including, but not limited to. The embodiments described in the detailed description are preferred embodiments of the present invention and are not intended to limit the scope of the present invention.
Moreover, those skilled in the art will appreciate that aspects of the present invention may be embodied as a system, method or computer program product. Accordingly, various aspects of the present invention may be embodied in a combination of hardware and software, which may be referred to herein generally as a "circuit," module "or" system. Furthermore, in some embodiments, various aspects of the invention may also be embodied in the form of a computer program product in one or more microcontroller-readable media having microcontroller-readable program code embodied therein.
Example 1
The foundation pile detection method of the embodiment comprises the following steps:
modeling various defects of the foundation pile in advance to reduce the section area of the foundation pile, and matching and setting a mapping relation between the damage degree and the integrity coefficient of the foundation pile;
actually measuring a pile top vibration speed time-domain curve graph of the foundation pile by adopting a low-strain reflection wave method;
calculating to obtain the damage position of the foundation pile according to the time domain curve graph, specifically:
identifying longitudinal wave velocity, incident wave crest and reflected wave crest occurrence time parameters of the foundation pile according to the time domain curve graph, and substituting the time parameters into a formula
Calculating to obtain the damage position, wherein D is the distance between the defect damage and the pile top, V is the longitudinal wave velocity of the foundation pile, and t2Time of occurrence of a defective reflected wave, t1The time of occurrence of the incident wave;
calculating low-strain reflected wave power fingerprints with different damage degrees by adopting a foundation pile power problem analysis method based on the damage position;
fitting an approximate function relation between the low-strain reflected wave power fingerprint and the integrity coefficient of the foundation pile by a least square method;
actually measuring a time-domain curve graph of the pile top vibration speed according to a low-strain reflection wave method to obtain an actually measured low-strain reflection wave power fingerprint, substituting the actually measured low-strain reflection wave power fingerprint into an approximate function relation, and calculating to obtain a foundation pile integrity coefficient eta;
and obtaining the damage grade of the foundation pile according to the integrity coefficient eta, wherein the grade comprises perfect, slight defect, obvious defect and broken pile.
The low-strain reflected wave power fingerprint calculation method in the embodiment includes:
collecting defect reflected wave peak value A in pile top vibration speed time domain curve chart of actually measured foundation pile by low-strain reflected wave methoddAnd the peak value A of the incident wave0；
Substituting into a formula:
and obtaining the low-strain reflected wave power fingerprint phi.
The fitting of the approximate function relation between the low-strain reflected wave dynamic fingerprint and the foundation pile integrity coefficient by the least square method in the embodiment specifically includes:
taking N complete coefficients η within a preset damage degree rangek(k＝1,2,3…N)；
The pile top dynamic response under different complete coefficients is calculated by adopting a foundation pile dynamic problem analytic solution considering the pile-soil coupling effect, and N incident wave peak values A are obtained0 kAnd the peak value A of the reflected waved kAnd calculating to obtain the low-strain reflected wave power fingerprint phi of N foundation pilesk(k＝1，2，…n)；
Based on the obtained N groups of data (η)k，φk) And fitting an approximate function relation between the low-strain reflected wave dynamic fingerprint and the integrity coefficient of the foundation pile by using a least square method.
The approximate functional relation in this embodiment is:
wherein
Is the undetermined coefficient of a sextic polynomial.
The approximate functional relation in this embodiment is:
η＝η(φ)＝η[φ(X1,X2)；X3,X4,X5…Xn]
wherein X1Is the peak of the defect reflection, X2Is the peak of the defect incident wave; x3,X4,X5…XnThe parameters are excitation parameters, foundation pile structure parameters and foundation parameters.
The excitation parameters, the foundation pile structure parameters and the foundation parameters in the embodiment specifically include: one or more of the parameters of the amplitude of the exciting force, the pulse width, the equivalent radius of the foundation pile, the longitudinal wave velocity of the concrete of the foundation pile, the mass density of the concrete of the foundation pile, the material damping of the concrete of the foundation pile, the shear wave velocity of the soil layer and the mass density.
The various defects of the foundation pile in the embodiment comprise one or more of a pile body necking defect, a pile body concrete segregation defect, a pile body mud clamping defect, a pile breaking defect and pile bottom sediment.
In this embodiment, the modeling of various defects of the foundation pile into a reduction in the cross-sectional area of the foundation pile in advance, and the matching of the set mapping relationship between the damage degree and the integrity coefficient of the foundation pile specifically include:
substituting the area of the defect section and the section area of the pile body of the foundation pile into a formula:
wherein ZdIs the area of the defect cross-section, Z0The cross-sectional area of the pile body.
Example 2
Referring to fig. 1, the present embodiment provides a foundation pile detection system, including:
the device comprises an excitation device, a sensor, an amplifier, a control processing device and a display device;
the excitation equipment applies excitation load to the end part of the foundation pile, receives the propagation speed of stress waves in the pile body through the sensor, amplifies signals received by the sensor through the amplifier and then sends the amplified signals into the control processing device for calculation and analysis to obtain reflected wave waveforms;
carrying out systematic analysis on the detected reflected wave oscillogram, and matching the waveform characteristics with the defect types to obtain the defects existing in the pile body
The excitation equipment comprises one or more of a hand hammer and a force rod and is used for applying proper excitation on the pile top;
the sensor comprises one or more of a speed sensor, an acceleration sensor and a displacement sensor and is used for collecting reflected wave signals;
the amplifier is a voltage amplifier and is used for providing amplification functions of high signal-to-noise ratio and high gain for reflected wave signals collected by the sensor;
the control processor is used for receiving data sent by the amplifier and executing the following steps:
modeling various defects of the foundation pile in advance to reduce the section area of the foundation pile, and matching and setting a mapping relation between the damage degree and the integrity coefficient of the foundation pile;
actually measuring a pile top vibration speed time-domain curve graph of the foundation pile by adopting a low-strain reflection wave method;
calculating to obtain the damage position of the foundation pile according to the time domain curve graph, specifically:
identifying longitudinal wave velocity, incident wave crest and reflected wave crest occurrence time parameters of the foundation pile according to the time domain curve graph, and substituting the time parameters into a formula
Calculating to obtain the damage position, wherein D is the distance between the defect damage and the pile top, V is the longitudinal wave velocity of the foundation pile, and t2Time of occurrence of a defective reflected wave, t1The time of occurrence of the incident wave;
calculating low-strain reflected wave power fingerprints with different damage degrees by adopting a foundation pile power problem analysis method based on the damage position;
fitting an approximate function relation between the low-strain reflected wave power fingerprint and the integrity coefficient of the foundation pile by a least square method;
actually measuring a time-domain curve graph of the pile top vibration speed according to a low-strain reflection wave method to obtain an actually measured low-strain reflection wave power fingerprint, substituting the actually measured low-strain reflection wave power fingerprint into an approximate function relation, and calculating to obtain a foundation pile integrity coefficient eta;
and obtaining the damage grade of the foundation pile according to the integrity coefficient eta, wherein the grade comprises perfect, slight defect, obvious defect and broken pile.
Example 3
The present embodiment provides a storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the pile detection method according to embodiment 1.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, may be located in one place. Or may be distributed over multiple network elements. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
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 such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention.
And the aforementioned storage medium includes: a U disk, a mobile hard disk, and a Read-Only Memory (ROM). Various media capable of storing program check codes, such as Random Access Memory (RAM), magnetic disk, or optical disk.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A foundation pile detection method is characterized by comprising the following steps:
modeling various defects of the foundation pile in advance to reduce the section area of the foundation pile, and matching and setting a mapping relation between the damage degree and the integrity coefficient of the foundation pile;
actually measuring a pile top vibration speed time-domain curve graph of the foundation pile by adopting a low-strain reflection wave method;
calculating to obtain the damage position of the foundation pile according to the time domain curve graph, specifically:
identifying longitudinal wave velocity, incident wave crest and reflected wave crest occurrence time parameters of the foundation pile according to the time domain curve graph, and substituting the time parameters into a formula
Calculating to obtain the damage position, wherein D is the distance between the defect damage and the pile top, V is the longitudinal wave velocity of the foundation pile, and t2Time of occurrence of a defective reflected wave, t1The time of occurrence of the incident wave;
calculating low-strain reflected wave power fingerprints with different damage degrees by adopting a foundation pile power problem analysis method based on the damage position;
fitting an approximate function relation between the low-strain reflected wave power fingerprint and the integrity coefficient of the foundation pile by a least square method;
actually measuring a time-domain curve graph of the pile top vibration speed according to a low-strain reflection wave method to obtain an actually measured low-strain reflection wave power fingerprint, substituting the actually measured low-strain reflection wave power fingerprint into an approximate function relation, and calculating to obtain a foundation pile integrity coefficient eta;
and obtaining the damage grade of the foundation pile according to the integrity coefficient eta, wherein the grade comprises perfect, slight defect, obvious defect and broken pile.
2. A foundation pile detection method according to claim 1, wherein the low strain reflected wave power fingerprint calculation method comprises:
collecting defect reflected wave peak value A in pile top vibration speed time domain curve chart of actually measured foundation pile by low-strain reflected wave methoddAnd the peak value A of the incident wave0；
Substituting into a formula:
and obtaining the low-strain reflected wave power fingerprint phi.
3. The pile detection method according to claim 2, wherein the fitting of the approximate functional relation between the low-strain reflected wave dynamic fingerprint and the pile integrity coefficient by a least square method specifically comprises:
taking N complete coefficients η within a preset damage degree rangek(k＝1,2,3…N)；
Using foundation pile power taking into account pile-soil couplingThe problem analysis solution calculates to obtain pile top dynamic response under different complete coefficients to obtain N incident wave peak values A0 kAnd the peak value A of the reflected waved kAnd calculating to obtain the low-strain reflected wave power fingerprint phi of N foundation pilesk(k＝1，2，…n)；
Based on the obtained N groups of data (η)k，φk) And fitting an approximate function relation between the low-strain reflected wave dynamic fingerprint and the integrity coefficient of the foundation pile by using a least square method.
4. A pile detection method according to claim 3, wherein said approximate functional relation is:
wherein
Is the undetermined coefficient of a sextic polynomial.
5. A foundation pile detection method according to claim 4, wherein the approximate functional relation is:
η＝η(φ)＝η[φ(X1,X2)；X3,X4,X5…Xn]
wherein X1Is the peak of the defect reflection, X2Is the peak of the defect incident wave; x3,X4,X5…XnThe parameters are excitation parameters, foundation pile structure parameters and foundation parameters.
6. The foundation pile detection method according to claim 5, wherein the excitation parameters, the foundation pile structure parameters and the foundation parameters specifically include: one or more of the parameters of the amplitude of the exciting force, the pulse width, the equivalent radius of the foundation pile, the longitudinal wave velocity of the concrete of the foundation pile, the mass density of the concrete of the foundation pile, the material damping of the concrete of the foundation pile, the shear wave velocity of the soil layer and the mass density.
7. The foundation pile detection method according to claim 1, wherein the various types of defects of the foundation pile comprise one or more of a pile body necking defect, a pile body concrete segregation defect, a pile body mud clamping defect, a pile breaking defect and pile bottom sediment.
8. The method for detecting the foundation pile according to claim 1, wherein the step of modeling various types of defects of the foundation pile in advance to reduce the cross-sectional area of the foundation pile and matching and setting the mapping relationship between the damage degree and the integrity coefficient of the foundation pile specifically comprises the steps of:
substituting the area of the defect section and the section area of the pile body of the foundation pile into a formula:
wherein ZdIs the area of the defect cross-section, Z0The cross-sectional area of the pile body.
9. A foundation pile detection system, comprising: the device comprises an excitation device, a sensor, an amplifier, a control processing device and a display device;
the excitation equipment applies excitation load to the end part of the foundation pile, receives the propagation speed of stress waves in the pile body through the sensor, amplifies signals received by the sensor through the amplifier and then sends the amplified signals into the control processing device for calculation and analysis to obtain reflected wave waveforms;
carrying out systematic analysis on the detected reflected wave oscillogram, and matching the waveform characteristics with the defect types to obtain the defects existing in the pile body
The excitation equipment comprises one or more of a hand hammer and a force rod and is used for applying proper excitation on the pile top;
the sensor comprises one or more of a speed sensor, an acceleration sensor and a displacement sensor and is used for collecting reflected wave signals;
the amplifier is a voltage amplifier and is used for providing amplification functions of high signal-to-noise ratio and high gain for reflected wave signals collected by the sensor;
the control processor is used for receiving data sent by the amplifier and executing the following steps:
modeling various defects of the foundation pile in advance to reduce the section area of the foundation pile, and matching and setting a mapping relation between the damage degree and the integrity coefficient of the foundation pile;
actually measuring a pile top vibration speed time-domain curve graph of the foundation pile by adopting a low-strain reflection wave method;
calculating to obtain the damage position of the foundation pile according to the time domain curve graph, specifically:
identifying longitudinal wave velocity, incident wave crest and reflected wave crest occurrence time parameters of the foundation pile according to the time domain curve graph, and substituting the time parameters into a formula
Calculating to obtain the damage position, wherein D is the distance between the defect damage and the pile top, V is the longitudinal wave velocity of the foundation pile, and t2Time of occurrence of a defective reflected wave, t1The time of occurrence of the incident wave;
calculating low-strain reflected wave power fingerprints with different damage degrees by adopting a foundation pile power problem analysis method based on the damage position;
fitting an approximate function relation between the low-strain reflected wave power fingerprint and the integrity coefficient of the foundation pile by a least square method;
actually measuring a time-domain curve graph of the pile top vibration speed according to a low-strain reflection wave method to obtain an actually measured low-strain reflection wave power fingerprint, substituting the actually measured low-strain reflection wave power fingerprint into an approximate function relation, and calculating to obtain a foundation pile integrity coefficient eta;
and obtaining the damage grade of the foundation pile according to the integrity coefficient eta, wherein the grade comprises perfect, slight defect, obvious defect and broken pile.
10. A storage medium, characterized in that the storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps of the pile detection method according to any one of claims 1 to 8.
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