CN110514538A - High-intensitive rock crustal stress K point test method based on Kaiser effect - Google Patents
High-intensitive rock crustal stress K point test method based on Kaiser effect Download PDFInfo
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N3/06—Special adaptations of indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0298—Manufacturing or preparing specimens
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
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- G01N2203/0658—Indicating or recording means; Sensing means using acoustic or ultrasonic detectors
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Abstract
The high-intensitive rock crustal stress K point test method based on Kaiser effect that the invention discloses a kind of, rock sample is replaced using undisturbed high mixture ratio concrete sample, to eliminate influence caused by primary preservation stress, it is 140kHz using NANO30(resonance frequency, advantage frequency range is 125 ~ 750kHz) and R6 α (resonance frequency 60kHz, advantage frequency range acquires the AE signal of high and low frequency for 35 ~ 100kHz), two kinds of resonant frequency sensors, K point is primarily determined using 2 representational sound emission time domain parameter synthesis, it tests simultaneously according to the distribution characteristics of its dominant frequency to its accuracy, finally verified again in terms of multiband energy-distributing feature, 3 kinds of methods are established mutually to prove, the method for improving test accuracy.
Description
Technical field
The high-intensitive rock crustal stress K point test method based on Kaiser effect that the present invention relates to a kind of, and in particular to base
In the determination method of multiband, the Kaiser effect K point of multi-parameter sound emission.
Background technique
Sound emission (AE) generated elastic wave phenomenon when being the strain energy quick release of material internal storage.German J
When the stress of Kaiser research discovery Polycrystalline Metals reloads again after the release of its all-time high, if stress is not up to first
Preceding maximum stress value, then seldom acoustic emission generates, and after stress reaches and exceeds all-time high, then can generate a large amount of
Acoustic emission signal, this phenomenon is called Kaiser effect.Seldom turn from acoustic emission signal to what acoustic emission signal increased suddenly
Break is referred to as Kaiser point.
AE Kaiser effect method test crustal stress have it is simple, intuitive, be easy to the advantages of largely testing, Kaiser effect
The key that crustal stress should be measured is the selection of K point.It mainly utilizes sound emission to add up Ring-down count the selection of Kaiser point, add up
Energy, or carry out the processing of multiplicity to curve or parameter value on this basis, and mostly use single time domain parameter analyzed (compared with
Frequency domain parameter is considered less), since the otherness and each parameter distribution of sound emission of all kinds of resonant frequency sensors acquisition signal are special
The otherness of sign, causes result of study to show diversity, brings to the application of AE Kaiser effect test crustal stress tired
It is difficult.Therefore, by sound emission time domain multi-parameter and frequency domain parameter in conjunction with determining that Kaiser point will be the trend of development.
Simultaneously as lithology type diversity and its initial stress state it is indefinite, so apply sound emission
When Kaiser effect tests crustal stress, can not verifying the accuracy that it is tested, (there is also this to ask for other detecting earth stress methods
Topic) so that there are more disputes for Kaiser point method of determination at present.
Summary of the invention
In place of solving the deficiencies in the prior art set forth above, the present invention provides a kind of height based on Kaiser effect
Intensity rock crustal stress K point test method, the technical solution adopted is as follows:
A kind of high mixture ratio concrete ground stress K point test method based on Kaiser effect, comprising:
High mixture ratio concrete sample is prepared as high-intensitive rock, uniaxial compression test is carried out to high mixture ratio concrete sample, really
Determine the peak load under Uniaxial Compression, according to load peaks, cyclic loading and unloading is carried out to high mixture ratio concrete sample, until
It is loaded onto destruction, while experimentation is monitored by acoustic emission system for monitoring, the sound that acoustic emission system for monitoring is generated
Transmitting signal is acquired；
Analysis is different plus unloads in cyclic process, the absolute energy of the acoustic emission signal of acoustic emission signal acquisition device acquisition and vibration
The AE Kaiser effect character that bell counts, while Fourier's change is carried out to the signal of acoustic emission signal acquisition device acquisition
It changes, the different basic frequency of signal values added in unloading cyclic process of statistics；
Respectively according in the AE Kaiser effect character and different cyclic processes of sound emission absolute energy and Ring-down count
Basic frequency of signal value establishes the preliminary foundation for determining K point；
During different CYCLIC LOADINGs, the waveform near K point primarily determined carries out three layers of wavelet packet decomposition, to each frequency band energy
Amount accounting is counted, and the situation of change of each frequency band energy accounting during different CYCLIC LOADINGs is analyzed, to energy accounting
High frequency range is counted, and is analyzed the distribution characteristics of energy at K point, is determined K point.
Wherein, in the step of carrying out uniaxial compression test to high mixture ratio concrete sample, the high mixture ratio concrete sample
It is to replace being tested by the high mixture ratio concrete sample of 1:1 using the undisturbed ratio of mud.
Wherein, acoustic emission signal acquisition device is R6 α, NANO30 two kind resonant frequency sensor.
Wherein, during the experiment, sound emission monitoring is carried out to high mixture ratio concrete sample by acoustic emission monitoring system,
The acoustic emission monitoring system is PCI-II, Disp acoustic emission monitoring system, and the two is connected to high mixture ratio concrete sample；Its
In, the resonance frequency of R6 α resonant frequency sensor is 60kHz, and advantage frequency range is 35 ~ 100kHz, for acquiring this band limits
Interior acoustic emission signal；NANO30 resonance frequency is 140kHz, and advantage frequency range is 125 ~ 750kHz, for acquiring this band limits
Interior acoustic emission signal.
Wherein, during adding unloading to test high mixture ratio concrete sample progress uniaxial cycling, control mode is used
Load load, cycle-index are 4 times, the load value of each CYCLIC LOADING be high mixture ratio concrete sample peak load 20%,
40%, 60%, 80%, load and rate of debarkation are all 0.1kN/s, until high mixture ratio concrete sample is loaded onto destruction.
It is different from the prior art, the high-intensitive rock crustal stress K point test provided by the present invention based on Kaiser effect
Method replaces rock sample by the strong concrete test specimen of 1:1 using the undisturbed ratio of mud, is answered with reducing primary preservation
It is influenced caused by power.Acoustic emission signal is acquired simultaneously using two kinds of resonant frequency sensors, by Ring-down count and absolutely
Energy is combined and primarily determines Kaiser effect point, while being tested according to the distribution characteristics of its dominant frequency to its accuracy,
Finally from frequency domain angle analysis multiband energy-distributing feature, result is verified again, establish three kinds of methods mutually prove,
The method for improving test accuracy.
Detailed description of the invention
Fig. 1 is a kind of stream of high-intensitive rock crustal stress K point test method based on Kaiser effect provided by the invention
Journey schematic diagram.
Fig. 2 is applied in a kind of high-intensitive rock crustal stress K point test method based on Kaiser effect provided by the invention
Accumulative Ring-down count-absolute energy-time of two kinds of resonance playing card sensors acquisition is bent when loading 40% that lotus is peak load
Line.
Fig. 3 is applied in a kind of high-intensitive rock crustal stress K point test method based on Kaiser effect provided by the invention
Accumulative Ring-down count-absolute energy-time of two kinds of resonance playing card sensors acquisition is bent when loading 60% that lotus is peak load
Line.
Fig. 4 is applied in a kind of high-intensitive rock stress K point test method based on Kaiser effect provided by the invention
Accumulative Ring-down count-absolute energy-time graph of two kinds of resonance playing card sensors acquisition when load is the 80% of peak load.
Fig. 5 is applied in a kind of high-intensitive rock crustal stress K point test method based on Kaiser effect provided by the invention
Accumulative Ring-down count-absolute energy-time of two kinds of resonance playing card sensors acquisition is bent when loading 100% that lotus is peak load
Line.
Fig. 6 is a kind of patrolling for high-intensitive rock crustal stress K point test method based on Kaiser effect provided by the invention
Collect schematic diagram.
Fig. 7 is the two of a kind of high-intensitive rock crustal stress K point test method based on Kaiser effect provided by the invention
The schematic diagram of kind sensor acquisition data summarization.
Fig. 8 is R6 α in a kind of high-intensitive rock crustal stress K point test method based on Kaiser effect provided by the invention
Monitor No. 1 Kaiser point and nearby each band energy accounting change curve.
Fig. 9 is in a kind of high-intensitive rock crustal stress K point test method based on Kaiser effect provided by the invention
NANO30 monitors No. 1 Kaiser point and nearby each band energy accounting change curve.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.
In the description of the present invention, it is to be understood that, term " on ", "lower", "front", "rear", "left", "right", "top",
The orientation or positional relationship of the instructions such as "bottom", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, merely to just
In description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with
Specific orientation construction and operation, therefore be not considered as limiting the invention.
Fig. 1 and Fig. 6 is consulted, Fig. 1 is a kind of high-intensitive rock crustal stress K point based on Kaiser effect provided by the invention
The flow diagram of test method, Fig. 6 are a kind of high-intensitive rock crustal stress K points based on Kaiser effect provided by the invention
The logical schematic of test method.The step of this method includes:
S110: high mixture ratio concrete sample is prepared as high-intensitive rock, uniaxial compression examination is carried out to high mixture ratio concrete sample
It tests, determines the peak load under Uniaxial Compression, according to load peaks, high mixture ratio concrete sample recycle plus unloaded
It carries, until being loaded onto destruction, while experimentation is monitored by acoustic emission system for monitoring, acoustic emission system for monitoring is produced
Raw acoustic emission signal is acquired.
S120: analyzing in different cyclic processes, the absolute energy of the acoustic emission signal of acoustic emission signal acquisition device acquisition
With the AE Kaiser effect character of Ring-down count, while to acoustic emission signal acquisition device acquisition signal carry out Fourier
Transformation, counts the basic frequency of signal value in different cyclic processes.
S130: the AE Kaiser effect character and different circulations according to sound emission absolute energy and Ring-down count respectively
Basic frequency of signal value in the process establishes the preliminary foundation for determining K point.
S140: during different CYCLIC LOADINGs, the waveform near K point primarily determined carries out three layers of wavelet packet decomposition,
Each frequency band energy accounting is counted, the situation of change of each frequency band energy accounting during different CYCLIC LOADINGs is analyzed,
The frequency range high to energy accounting counts, and analyzes the distribution characteristics of energy at K point, determines K point.
Preferably, acoustic emission signal acquisition device is R6 α, NANO30 two kind resonant frequency sensor.
Preferably, during the experiment, sound emission prison is carried out to high mixture ratio concrete sample by acoustic emission monitoring system
Control, the acoustic emission monitoring system are PCI-II, Disp acoustic emission monitoring system, and the two is connected to high mixture ratio concrete sample；
Wherein, the resonance frequency of R6 α resonant frequency sensor is 60kHz, and advantage frequency range is 35 ~ 100kHz, for acquiring this frequency range model
Enclose interior acoustic emission signal；NANO30 resonance frequency is 140kHz, and advantage frequency range is 125 ~ 750kHz, for acquiring this frequency range model
Enclose interior acoustic emission signal.
Preferably, during carrying out uniaxial cycling loading experiment to high mixture ratio concrete sample, control mode is used
Load load, cycle-index are 4 times, the load value of each CYCLIC LOADING be high mixture ratio concrete sample peak load 20%,
40%, 60%, 80%, load and rate of debarkation are all 0.1kN/s, until high mixture ratio concrete sample is loaded onto destruction.
Specifically, preparing dust and sand ratio is 1:1, having a size of 50mm × 50mm × 100mm concrete sample.According to international rock
The nonparallelism of suggestion of the stone society of theoretical and applied mechanics to laboratory sample size, prepared test specimen two ends face is less than 0.05mm, utilizes
SPM-250 double plate wafer lapping machine polishes to preparation test specimen two ends, is required with guarantee test.Rock is carried out to it by press machine
Mechanical test measures its peak load, and test quantity is no less than 6, and peak value takes its average value, is carrying out list to same batch test specimen
Its load peaks is 100kN after axis compression test.
High mixture ratio concrete sample is subjected to uniaxial cycling load, control mode is loaded using load, cycle-index 4
It is secondary, be finally loaded onto destruction, the peak load of each CYCLIC LOADING measured before being test specimen peak load 20%, 40%, 60%,
80%, adding rate of debarkation is all 0.1kN/s.From entire loaded is loaded into for the first time, it is always on PCI-II, Disp sound hair
It penetrates monitoring system to be monitored destructive process, and sound is sent out using R6 α, NANO30 two kind sensor in test specimen destructive process
Signal is penetrated to be acquired.PCI-II acoustic emission system is connect with NANO30 resonant frequency sensor, Disp acoustic emission system with
The connection of R6 α resonant frequency sensor.Every kind of resonant frequency sensor each 2, amount to 4.
Under 40% level conditions of peak load (second of CYCLIC LOADING), reaching after increasing occurs in sound emission absolute energy
The phenomenon that peak value is then begun to decline, and Ring-down count curve grows steadily can be used as the foundation for determining K point, two kinds of resonance
Frequency sensor error is different, is minimized, but the two error is both less than 20% simultaneously.As shown in Figure 2.
Under 60% level conditions of peak load (third time CYCLIC LOADING), reaching after increasing occurs in sound emission absolute energy
First peak value, then begins to decline, while R6 α Ring-down count curve grows steadily, NANO30 Ring-down count increases suddenly shows
As can be used as the foundation for determining K point, error is less than 5%.As shown in Figure 3.
Under 80% level conditions of peak load (the 4th CYCLIC LOADING), by choosing the observation of result to Kaiser point,
There is different by the two sensors received signal regularity of distribution.Sound emission absolute energy occurs reaching first peak after increasing
Value, then begins to decline, and Ring-down count curve increases obvious phenomenon, can be used as the foundation for determining K point, and error is less than
5%.As shown in Figure 4.
Reach removal after occurring increasing with absolute energy under 100% level conditions of peak load (final load) to be damaged
Peak point after the maximum value of influence, it is that criterion can determine that for K point, error is less than 5% that ring curve, which increases phenomenon,.R6 α is adopted
Collection number of signals is about 48 times of NANO30, has different, but the differentiation to Kaiser point from each parameter overall variation trend
As a result essentially identical.As shown in Figure 5.
Fourier transformation is carried out using R6 α, NANO30 sensor signal collected in test specimen destructive process, when counting each
Between segment signal dominant frequency value, and summarized, the result is shown in Fig. 7.R6 α sensor sound emission master collected in entire loading procedure
Frequency is mainly distributed on the two sections 37-55kHz, 89-106kHz, and NANO30 sensor signal collected is concentrated mainly on
In tetra- sections 146-158kHz, 237-250kHz, 271-280kHz, 322-328kHz, while caning be found that at load initial stage
And before destroying, high frequency sensors have equally collected more low dominant frequency signal.In the preceding CYCLIC LOADING stage three times, sound emission letter
Number dominant frequency is distributed more, and more in the low dominant frequency signal distributions of the 4th, final load phase, this and temporal signatures in high-frequency region
Observed phenomenon is consistent.In final load, basic frequency of signal all largely occurs in high and low frequency.It can be by sound emission dominant frequency
Point before a large amount of appearance is determined as K point, and error is coincide less than 10% with theoretical K point substantially.
It is above-mentioned K point is differentiated on the basis of, for analyze each CYCLIC LOADING stage K point signal frequency component difference with
Waveform near each CYCLIC LOADING stage K point is carried out WAVELET PACKET DECOMPOSITION, and carried out to each frequency band energy accounting by the connection of K point
Statistics analyzes the changing rule of each frequency band energy accounting under different loads level, judges K point according to its rule.
Each CYCLIC LOADING stage is consistent for the determination method of K point, i.e., after waveform carries out WAVELET PACKET DECOMPOSITION near to K point
After frequency band energy calculates analysis, discovery R6 α can be using 0 ~ 62.5kHz as sound emission signal characteristic frequency range, and NANO30 can be incited somebody to action
As sound emission signal characteristic frequency range, and in two frequency ranges, K point energy will be higher than consecutive points to 187.5 ~ 250kHz, can be by this
As an important evidence for differentiating K.
Being divided into for band energy accounting is carried out at 21 points near the Kaiser point of second of CYCLIC LOADING with experimental sample
Example, curve such as Fig. 8 and Fig. 9 that different each band energies of resonance frequency change over time.
Compare from energy accounting degree, NANO30 institute's monitoring signals accounting mean value in 187.5 ~ 250kHz frequency range is about
35%, remaining each frequency band energy accounts for smaller, and primary power accounting is in reduced levels, starts again after slightly rising
Decline, later at K point (the 6th point) arrival energy accounting peak value, then sharply decline.K point energy accounting can be existed
There is the phenomenon that peak value and sentences otherwise as K point in 187.5 ~ 250kHz frequency range.
It is different from the prior art, the high-intensitive rock crustal stress K point test provided by the present invention based on Kaiser effect
Method replaces rock sample by the strong concrete test specimen of 1:1 using the undisturbed ratio of mud, is answered with reducing primary preservation
It is influenced caused by power.Acoustic emission signal is acquired simultaneously using two kinds of resonant frequency sensors, by Ring-down count and absolutely
Energy is combined and primarily determines Kaiser effect point, while being tested according to the distribution characteristics of its dominant frequency to its accuracy,
Finally from frequency domain angle analysis multiband energy-distributing feature, result is verified again, establish three kinds of methods mutually prove,
The method for improving test accuracy.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (5)
1. a kind of high-intensitive rock crustal stress K point test method based on Kaiser effect characterized by comprising
High mixture ratio concrete sample is prepared as high-intensitive rock, uniaxial compression test is carried out to high mixture ratio concrete sample, really
Determine the peak load under Uniaxial Compression, according to load peaks, cyclic loading and unloading is carried out to high mixture ratio concrete sample, until
It is loaded onto destruction, while experimentation is monitored by acoustic emission system for monitoring, the sound that acoustic emission system for monitoring is generated
Transmitting signal is acquired；
Analysis is different plus unloads in cyclic process, the absolute energy of the acoustic emission signal of acoustic emission signal acquisition device acquisition and vibration
The AE Kaiser effect character that bell counts, while Fourier's change is carried out to the signal of acoustic emission signal acquisition device acquisition
It changes, the different basic frequency of signal values added in unloading cyclic process of statistics；
Respectively according in the AE Kaiser effect character and different cyclic processes of sound emission absolute energy and Ring-down count
Basic frequency of signal value establishes the preliminary foundation for determining K point；
During different CYCLIC LOADINGs, the waveform near K point primarily determined carries out three layers of wavelet packet decomposition, to each frequency band energy
Amount accounting is counted, and the situation of change of each frequency band energy accounting during different CYCLIC LOADINGs is analyzed, to energy accounting
High frequency range is counted, and is analyzed the distribution characteristics of energy at K point, is determined K point.
2. the high-intensitive rock crustal stress K point test method according to claim 1 based on Kaiser effect, feature exist
In, to high mixture ratio concrete sample carry out uniaxial compression test the step of in, the high mixture ratio concrete sample be using not by
The ratio of mud of disturbance is replaced being tested by the high mixture ratio concrete sample of 1:1.
3. the high-intensitive rock crustal stress K point test method according to claim 1 based on Kaiser effect, feature exist
In acoustic emission signal acquisition device is R6 α, NANO30 two kind resonant frequency sensor.
4. the high-intensitive rock crustal stress K point test method according to claim 3 based on Kaiser effect, feature exist
During the experiment, by acoustic emission monitoring system to the progress sound emission monitoring of high mixture ratio concrete sample, the sound emission
Monitoring system is PCI-II, Disp acoustic emission monitoring system, and the two is connected to high mixture ratio concrete sample；Wherein, R6 α resonance frequency
The resonance frequency of rate sensor is 60kHz, and advantage frequency range is 35 ~ 100kHz, for acquiring the letter of the sound emission in this band limits
Number；NANO30 resonance frequency is 140kHz, and advantage frequency range is 125 ~ 750kHz, for acquiring the letter of the sound emission in this band limits
Number.
5. the high-intensitive rock crustal stress K point test method according to claim 1 based on Kaiser effect, feature exist
During adding unloading to test high mixture ratio concrete sample progress uniaxial cycling, control mode is loaded using load, is followed
Ring number is 4 times, and the load value of each CYCLIC LOADING is 20%, 40%, 60%, the 80% of high mixture ratio concrete sample peak load,
Load and rate of debarkation are all 0.1kN/s, until high mixture ratio concrete sample is loaded onto destruction.
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| CN112100842A (en) * | 2020-09-10 | 2020-12-18 | 江西理工大学 | Novel method for identifying abnormal region of crustal stress and measuring crustal stress in large range |
| CN112528805A (en) * | 2020-12-04 | 2021-03-19 | 湖南五凌电力科技有限公司 | Water turbine pressure pulsation analysis method, device, equipment and storage medium |
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| CN112100842A (en) * | 2020-09-10 | 2020-12-18 | 江西理工大学 | Novel method for identifying abnormal region of crustal stress and measuring crustal stress in large range |
| CN112100842B (en) * | 2020-09-10 | 2022-04-29 | 江西理工大学 | Novel method for identifying abnormal region of crustal stress and measuring crustal stress in large range |
| CN112528805A (en) * | 2020-12-04 | 2021-03-19 | 湖南五凌电力科技有限公司 | Water turbine pressure pulsation analysis method, device, equipment and storage medium |
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Application publication date: 20191129 |