CN107807055B - A kind of asphalt multisequencing dynamic creep experimental data processing and analysis method - Google Patents
A kind of asphalt multisequencing dynamic creep experimental data processing and analysis method Download PDFInfo
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- CN107807055B CN107807055B CN201710918621.1A CN201710918621A CN107807055B CN 107807055 B CN107807055 B CN 107807055B CN 201710918621 A CN201710918621 A CN 201710918621A CN 107807055 B CN107807055 B CN 107807055B
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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
- G01N2203/001—Impulsive
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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
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0071—Creep
Abstract
The invention discloses a kind of asphalt multisequencing dynamic creep experimental data processing and analysis methods, low-pass filtering is carried out to the deformation of creep data that test measures by one Butterworth LPF of design, obtain smooth creep curve, the average permanent strain rate of each loadingsequence is calculated separately again, then according to three indexs of formula Calculation Estimation creep property of asphalt mixture: strain rate Sensitivity Index SRSI, compound average permanent strain rate CAPSR, compound creep stiffness modulus CCSM:SRSI is bigger, mean that influence of the stress state to material creep is more significant；CAPSR then represents the equivalent strain rate under Various Complex stress state, and the value is bigger, shows that the permanent strain generated in primary load in material is bigger, the high-temperature behavior of material is poorer；CCSM represents the power of the permanent deformation resistance of material at the end of creep test, and the value is bigger, it was demonstrated that the high-temperature behavior of material is better.
Description
Technical field
The present invention relates to a kind of asphalt multisequencing dynamic creep experimental data processing and analysis methods, belong to road
Care field.
Background technique
U.S.'s NCHRP project recommend dynamic creep test be widely used at present probe into asphalt height
The laboratory test of warm creep properties, the test are loaded using half-sine pulse, it is considered to be vehicle on closest to practical road surface
The action mode of load, the flow number proposed based on the test is the evaluation High Temperature Stability of Asphalt Mixture being widely adopted
Index.Many scholars propose some modified version tests, such as the multi-stage loading creep based on axle load spectrum on the basis of the test
Test, the test of uniaxial penetration dynamic creep etc., moreover, improving, flow number is still continued to use in test or compound rheological number comes
Evaluate the non-deformability of asphalt.
Practical experience shows that flow number is not a precision height, the index that variability is small, discrimination is good.Firstly, stream
The variability for becoming number is larger, such as multiple parallel test specimens of identical material, and the difference of flow number can be from tens to several hundred
Secondary etc., therefore, then the approximate range that certain material flowing deformation number can only be obtained by carrying out multiple parallel test is averaging
Value, so the number of parallel test directly affects the precision of index, and is limited to experimental condition and energy, this field is most absolutely
The parallel test of number research is arrived three times two, is far from being enough for index biggish for this variability.
Secondly, the definition of flow number is more fuzzy, the specific calculation method of specification is not formed.Asphalt
Creep curve can be divided into three phases, and the first stage shows as strain rate and is gradually reduced, and second stage strain rate is kept substantially
It is constant, phase III strain rate rapid growth, and flow number is defined as second stage and the critical point of phase III reply
Accumulation load number.Although the creep three stages curve of asphalt can use power function, linear function and index respectively
Function is fitted, but since strain rate of the material during changing to next stage is gradual change not mutated, not classmate
Person to how determining that critical point proposes different judgment criterias, such as someone enter using the minimum point of strain rate as material it is broken
The starting point in bad stage, somebody think just to mean that material enters brokenly when strain rate increases to 1.1 times of minimum point strain rate
The bad stage.Since unified standard is not yet reached in the judgement of critical point, results in and same group of test data is defined using different
The calculated result of standard has more apparent deviation, to exacerbate the variability of this index.
In addition, the test procedure of existing dynamic creep only acquires a deformation data in each loading cycle, that is, adopt
Sample frequency is 1, can not obtain all deformed response of the test specimen when entire impulsive load loads and unloads, and can not be learnt,
This sample in loading cycle which position, whether be it is fixed, these it is unknown for post analysis processing data make
At inconvenience.So improving sample frequency, being for accurately comprehensive material deformational behavior of the acquisition based on impulsive load must
It wants.More or less there is noise jamming in the acquired data of test apparatus, (1Hz), nothing when previous sampling frequency is lower
Body of laws shows the presence of high-frequency noise, therefore, it is impossible to effectively be filtered to test data.When sample frequency increases, it is necessary to first
Noise reduction process is carried out to the data of acquisition, the index that just can be carried out next step calculates.Therefore, suitable low-pass filter, which is arranged, is
This method head technical problems to be solved.
Importantly, flow number cannot effectively apply to instruct the maintenance management on practical road surface.This is because stream
Become number representative is that when entrance accelerates the failure the stage material, and cannot directly embody tiring out when material enters failure stage
Product deformation.And pavement maintenance management person concerns, has accumulated how many rutting deformation on road surface at present, if reach and need to carry out
The standard of maintenance, i.e., no matter material is in which of creep in stage, as long as track has been more than safety standard, during structure will face
It repairs.For example, nowadays repairing maintenance criteria in the track amount of Jiangsu Province's highway is 10mm, i.e. pavement track reaches 10mm
When to carry out the maintenance measures such as milling or cover.Track is road surfaces cross section sunken inside minimum point and protuberance highest point
The difference of deflection, according to existing research, the deflection of recess and bump pad close to 1:1, i.e., when reach repair standard in track when, road
The flow deformation of face recess is in 5mm or so, for the bitumen layer of 180mm thickness, is approximately equal to 2.8 ten thousand microstrains.Greatly
It measures indoor dynamic creep test data to show when test specimen initially enters and accelerates the failure the stage, the corresponding permanent microstrain of accumulation
Substantially 5~100,000, it can be found that road surface will be apparently higher than the standard of repairing in track, flow number is corresponding to be tired out for the two comparison
Product deformation, in other words, the bitumen layer in practical pavement structure also fail to have faced into the stage that accelerates the failure necessary
Middle mastery shield, therefore, obtains the flow number of material, has little significance for practical maintenance of surface for instructing.
In dynamic creep test, usually setting test specimen reaches 5~100,000 accumulation microstrains or accumulation load number reaches
Test stops when to 10000 times.In the uniaxial dynamic creep test of no confining pressure, axial stress 0.7MPa, flow number is usual
It is differed tens to several hundred times, but with the increase of confining pressure, flow number is also obviously increased.It is tried in three axis or injection dynamic creep
In testing, certain materials are in the strain rate very little of second stage, and material does not occur obviously destroying yet when leading to load 10000 times, because
And flow number can not be obtained, the superiority and inferiority for comparing the high-temperature behavior of different materials of also just having no way of.Moreover, 10000 loads are anticipated
Taste a test period close to 3 hours, test efficiency is lower.
In conclusion flow number evaluate asphalt high-temperature behavior when there is various disadvantages, solve this
A kind of method of problem is, using material creep second stage strain rate come the quality of judgement material non-deformability, this
It is because the strain rate of second stage is held essentially constant, the accumulated deformation of size and material has direct positive correlation, and is easy
It calculates, error is smaller, and accuracy is high.But since traditional dynamic creep is tested in primary test often only with single lotus
Carry action mode, i.e., primary test can only obtain the strain rate under a kind of loaded condition, such as obtain under a variety of force-bearing situations
Strain rate then needs to carry out test of many times, and this considerably increases the difficulty that workload and later data are handled.Therefore, it develops
The local dynamic station creep test that can carry out multisequencing load can be convenient, clearly compare the strain rate under different loaded conditions
Variation, analyze to the sensitivity of a certain condition, and calculate the composite strain rate under a variety of situations, compound creep stiffness mould
Amount etc., this method can be with the non-deformabilities of more scientific efficient evaluation asphalt.
Summary of the invention
Technical problem: the purpose of the present invention is to propose to a kind of asphalt multisequencing dynamic creep experimental data processing and
Analysis method, the analysis indexes proposed based on this method are high convenient for calculating, precision, more comprehensively, effectively can reflect that complexity is answered
The croop property of asphalt under power situation.
Technical solution: the present invention provides a kind of asphalt multisequencing dynamic creep experimental data processing and analysis sides
Method, method includes the following steps:
1) Butterworth LPF parameter is set, the noise jamming in bitumen mixture specimen creep data is removed,
Gentle creep curve is obtained, which is divided into primary creep behavior and creep second stage；
2) test specimen is extracted by first and the last one sampled point in each half-sine pulse load action period
Deformation data, then calculate permanent strain rate Δ ε of the asphalt within each load-bearing period according to the following formula:
In formula: Δ ε --- the permanent strain rate of test specimen in the single load-bearing period, unit: μ ε/s；
dl--- the accumulated deformation value of the last one sampled point, unit: mm in the single load-bearing period；
df--- the accumulated deformation value of first sampled point, unit: mm in the single load-bearing period；
The height of h --- test specimen, unit: mm；
T --- the duration in single pulse load period, unit: s；
3) each loadingsequence includes multiple duplicate half-sine pulse loading cycles, calculates each load sequence according to the following formula
The average permanent strain rate of column
In formula: i --- i-th of loadingsequence；
--- the average permanent strain rate in i-th of loadingsequence, unit: μ ε/s；
Δεj--- the permanent strain rate in i-th of loadingsequence in jth time loading cycle, unit: μ ε/s；
Ni--- the repetition in half-sine pulse period loads number in i-th of loadingsequence；
4) the average permanent strain rate of each loadingsequence calculated according to previous step, Calculation Estimation asphalt are anti-forever
Three indexs of long deformability are respectively: strain rate Sensitivity Index SRSI, compound average permanent strain rate CAPSR, compound compacted
Become stiffness modulus CCSM；
1. strain rate Sensitivity Index SRSI is calculated according to the following formula:
In formula: i --- i-th of loadingsequence；
SRSIi--- the strain rate Sensitivity Index of i-th of loadingsequence；
--- the sum of the superposition of the average permanent strain rate of all loadingsequences, unit: μ ε/s；
N --- the total number of creep test loadingsequence；
2. compound average permanent strain rate CAPSR is calculated according to the following formula:
In formula:--- compound average permanent strain rate, unit: μ ε/s；
Ni--- the repetition in half-sine pulse period loads number in i-th of loadingsequence；
N --- the total number of creep test loadingsequence；
N ' --- the half-sine pulse period repeats the total degree of load in all loadingsequences of creep second stage；
3. compound creep stiffness modulus CCSM is calculated according to the following formula:
In formula:--- the equivalent stress that test specimen is subject to, unit: MPa；
σi--- the stress rank of i-th of loadingsequence, unit: MPa；
N --- all loadingsequences repeat load number in total；
Δεp--- the permanent strain that test specimen is accumulated when off-test, unit: 1；
N --- the total number of creep test loadingsequence；
Sc--- the compound creep stiffness modulus of test specimen, unit: MPa.
Wherein:
It is 2~4 that Butterworth LPF parameter setting described in step 1), which is respectively as follows: order, and cutoff frequency is
10~30Hz.
Primary creep behavior described in step 1) is that creep migrates the phase, only comprising the sample under 1 preloading sequence effect
Deformation data；The creep second stage is creep stationary phase, includes the sample deformation data under the effect of multiple loadingsequences.
The number of loadingsequence is configured or adjusts according to test demand in the creep stationary phase.
In creep second stage described in step 1), the stress range of each loadingsequence 0.3~1.4MPa it
Between, pulse width is between 0.1~0.5s, and the intermittent time is between 0~10s.
Sample frequency in step 2) in each half-sine pulse load action period is 200~1000Hz.
The utility model has the advantages that compared with prior art, present invention has the advantage that
The analysis indexes of proposition are convenient for calculating, precision is high, can more comprehensively, effectively reflect pitch under complex stress situation
The croop property of mixture:
Creep curve is divided into two stages, and the first stage is preloading phase, it is therefore an objective to reach the permanent strain rate of test specimen
To stabilization；Second stage is multisequencing load phase, covers axis all on practical road surface and carries rank, and different speeds pair
The influence of creep, finally, the three norms for the evaluation asphalt non-deformability being calculated: strain rate Sensitivity Index
SRSI, compound average permanent strain rate CAPSR, compound creep stiffness modulus CCSM, more previous index more comprehensively, intuitively reflect
The creeping property of material under complex stress situation.
In addition, These parameters calculation formula is clear, accuracy is high, variability is small, it is flat under every kind of obtained force-bearing situation
Equal permanent strain rate is applicable not only to the meter of the compound average permanent strain rate of laboratory test test specimen, compound creep stiffness modulus
It calculates, moreover it is possible to be based on the actual axle load spectrum data in road surface, calculate the compound average permanent strain rate and compound creep strength on true road surface
Spend modulus.
In conclusion this analysis method can make to have set up between indoor experimental data and practical maintenance of surface data
Effect connection, facilitates two kinds of data and mutually compares confirmation, so that indoor experimental data be made preferably to instruct pavement maintenance management reality
It tramples, helps effectively being estimated to the track development of bituminous pavement for pavement maintenance management unit more convenient and quicker.
Detailed description of the invention
Fig. 1 is creep comparison diagram of the filtering front and back asphalt within the load action period twice；
Fig. 2 be the 4th loadingsequence average permanent strain rate and the sequence in load corresponding permanent strain rate every time
With the variation of load number；
Fig. 3 is the strain rate Sensitivity Index distribution map of all loadingsequences；
Fig. 4 is the average permanent strain rate of all loadingsequences of second stage and the compound average permanent strain rate of material.
Specific embodiment
By taking the test result of AC-20 type 70# asphalt as an example, the present invention is done in conjunction with the drawings and specific embodiments
It further illustrates.
The method of the present invention the following steps are included:
1) Butterworth (Butterworth) low-pass filter parameter is designed, the noise removed in test specimen creep data is dry
It disturbs, obtains gentle creep curve, wherein the determination method of order and cutoff frequency: determining the value model of each parameter first
It encloses, different combinations is then carried out in value range to two parameters, compare the filter effect under every kind of combination, it is final to determine
Optimum combination.
As shown in Figure 1, the figure shows (stress intensities in the 4th loadingsequence in multisequencing local dynamic station creep test
0.7MPa, pulse width 0.4s, intermittent time 0.6s) (total 2s, 1000 data points) filtering front and back in the first two loading cycle
Accumulated deformation data comparison.Sample frequency is set as 500Hz in this example, and therefore, collected data point is 500 in 1s,
The sampling interval of adjacent two o'clock is 2ms.It can be clearly seen that, the unfiltered data that solid line is shown have more wave from figure
Dynamic, i.e., the presence of so-called noise jamming, noise will affect greatly the accuracy that strain rate calculates, it is necessary to first logarithm
According to progress noise reduction process.
Butterworth low-pass filter is selected, by repeatedly attempting, discovery is that 3, cutoff frequency is set as when setting order
Filter effect when 20Hz is best.Intermittent line in figure eliminates noise substantially, and more smoothly, and two curves more paste
It closes, intermittent line is fluctuated generally within solid line near the intermediate value of data, illustrates that filtering is more successful, filtered data can embody
The correct deformation behaviour of test specimen out.It should be noted that the sample frequency of the setting and test of cutoff frequency is closely related.This example
The cutoff frequency of 20Hz is set, depending on being the sample frequency based on 500Hz in test, if the sample frequency in test have it is larger
Variation then needs to adjust the cutoff frequency of filter to reach satisfied filter effect.
2) test specimen is extracted by first and the last one sampled point in each half-sine pulse load action period
Deformation data, then calculate permanent strain rate Δ ε of the asphalt within each load-bearing period according to the following formula:
In formula: Δ ε --- the permanent strain rate of test specimen in the single load-bearing period, unit: μ ε/s；
dl--- the accumulated deformation value of the last one sampled point, unit: mm in the single load-bearing period；
df--- the accumulated deformation value of first sampled point, unit: mm in the single load-bearing period；
The height of h --- test specimen, unit: mm；
T --- the duration in single pulse load period, unit: s；
It is 1s, sample frequency 500Hz, height of specimen 150mm, therefore, public affairs due to loading the primary period in this example
Formula can be rewritten asBy taking loadingsequence four as an example, the permanent strain rate loaded every time being calculated is as schemed
Shown in 2, permanent strain rate is larger at load initial stage, is gradually reduced and tends towards stability with the increase of load number.
3) each loadingsequence includes multiple duplicate half-sine pulse loading cycles, calculates each load sequence according to the following formula
The average permanent strain rate of column
In formula: i --- i-th of loadingsequence；
--- the average permanent strain rate in i-th of loadingsequence, unit: μ ε/s；
Δεj--- the permanent strain rate in i-th of loadingsequence in jth time loading cycle, unit: μ ε/s；Ni—
The repetition in half-sine pulse period loads number in-i-th loadingsequence；
In this example, the repetition load number of remaining each sequence is 50 in addition to preloading sequence, after repeated loading
The average permanent strain rate that strain rate is averaged, then the value can represent the average mechanics of the material under this force-bearing situation
Response.The average permanent strain rate of all loadingsequences of creep second stage is illustrated in Fig. 4.
4) the average permanent strain rate of each loadingsequence calculated according to previous step, Calculation Estimation asphalt are anti-forever
Three indexs of long deformability are respectively: strain rate Sensitivity Index SRSI, compound average permanent strain rate CAPSR, compound compacted
Become stiffness modulus CCSM；
1. strain rate Sensitivity Index SRSI is calculated according to the following formula:
In formula: i --- i-th of loadingsequence；
SRSIi--- the strain rate Sensitivity Index of i-th of loadingsequence；
--- the sum of the superposition of the average permanent strain rate of all loadingsequences, unit: μ ε/s；
N --- the total number of creep test loadingsequence；
The index is that the average permanent strain rate measured under each loaded condition accounts for all loadingsequences respectively and averagely answers
The ratio of the sum of variability；The value being calculated is bigger, illustrates that corresponding stress state is more significant to the draw of material.Fig. 3
Shown in be the SRSI exponential distribution figure comprising totally 25 loadingsequences including preloading sequence.Wherein, preloading sequence
Stress rank is 0.7MPa, pulse width 0.1s；Remaining 24 sequence be respectively eight kinds of stress ranks (0.7MPa~
1.4MPa) and the combination of three kinds of pulse widths (0.1s~0.4s), the loading sequence of test and column from left to right as shown in the figure
The arrangement of shape figure is consistent.It is clear that from Fig. 3 when stress rank and pulse width are positively correlated with permanent strain rate,
And influence of the superposition of the two to strain rate is more significant.Although it is noted that stress shape suffered by preloading sequence
Condition and sequence 2 are consistent, but strain rate Sensitivity Index is close with sequence 18 (1.2MPa_0.2s), illustrate primary creep behavior (or
The densification stage of material) to material permanent deformation influence it is more significant, this is similar to the Accumulation of track on practical road surface,
The development speed of track is very fast after being just open to traffic.
2. compound average permanent strain rate CAPSR is calculated according to the following formula:
In formula:--- compound average permanent strain rate, unit: μ ε/s；
Ni--- the repetition in half-sine pulse period loads number in i-th of loadingsequence；
N ' --- the half-sine pulse period repeats the total degree of load in all loadingsequences of creep second stage；
N --- the total number of creep test loadingsequence；
Average permanent strain rate under every kind of force-bearing situation is overlapped by the step according to load number accounting, obtains one
A CAPSR for representing a variety of force-bearing situations, the value is smaller, then means that the high-temperature behavior of material is better.This formula is not only fitted
For laboratory test, practical road surface can also be extended to and carried out using that is,It is changed on practical road surface axle load spectrum accounting just
Can, the difference of the high-temperature behavior on the different axle load spectrum road surfaces of comparison that thus can be convenient.For convenience of for example, still adopting here
It is analyzed with the data of laboratory test, the CAPSR being calculated is as shown in the horizontal line of arrow meaning in Fig. 4.
3. compound creep stiffness modulus CCSM is calculated according to the following formula:
In formula:--- the equivalent stress that test specimen is subject to, unit: MPa；
σi--- the stress rank of i-th of loadingsequence, unit: MPa；
N --- all loadingsequences repeat load number in total；
Δεp--- the permanent strain that test specimen is accumulated when off-test, unit: 1；
N --- the total number of creep test loadingsequence；
Sc--- the compound creep stiffness modulus of test specimen, unit: MPa.
Compared with CAPSR, CCSM introduces the influence of axial stress and primary creep behavior, represents material and tries in creep
The power of the permanent deformation resistance of material at the end of testing, the value are bigger, it was demonstrated that the high-temperature behavior of material is better.With CAPSR phase
Instead, CCSM means that more greatly the non-deformability of material is better.
In this example, test specimen half-sine pulse load repeat function number in the preloading sequence of primary creep behavior is
400, therefore, the equivalent stress being calculated is 0.9625MPa；Height of specimen 150mm, the accumulation of test specimen is permanent when off-test
It is deformed into 5.2mm, accumulation permanent strain is 3.47%；Bringing above formula into and obtaining the CCSM of the material is 27.7MPa.
Claims (5)
1. a kind of asphalt multisequencing dynamic creep experimental data processing and analysis method, it is characterised in that: this method packet
Include following steps:
1) Butterworth LPF parameter is set, removes the noise jamming in bitumen mixture specimen creep data, obtains
Gentle creep curve, the curve are divided into primary creep behavior and creep second stage；
2) test specimen is extracted in the change by first in each half-sine pulse load action period and the last one sampled point
Then graphic data calculates permanent strain rate Δ ε of the asphalt within each load-bearing period according to the following formula:
In formula: Δ ε --- the permanent strain rate of test specimen in the single load-bearing period, unit: μ ε/s；
dl--- the accumulated deformation value of the last one sampled point, unit: mm in the single load-bearing period；
df--- the accumulated deformation value of first sampled point, unit: mm in the single load-bearing period；
The height of h --- test specimen, unit: mm；
T --- the duration in single pulse load period, unit: s；
3) each loadingsequence includes multiple duplicate half-sine pulse loading cycles, calculates each loadingsequence according to the following formula
Average permanent strain rate
In formula: i --- i-th of loadingsequence；
--- the average permanent strain rate in i-th of loadingsequence, unit: μ ε/s；
Δεj--- the permanent strain rate in i-th of loadingsequence in jth time loading cycle, unit: μ ε/s；Ni--- i-th plus
The repetition for carrying the half-sine pulse period in sequence loads number；
4) the average permanent strain rate of each loadingsequence calculated according to previous step, the anti-permanent change of Calculation Estimation asphalt
Three indexs of shape ability are respectively: strain rate Sensitivity Index SRSI, compound average permanent strain rate CAPSR, compound creep strength
Spend modulus CCSM；
1. strain rate Sensitivity Index SRSI is calculated according to the following formula:
In formula: i --- i-th of loadingsequence；
SRSIi--- the strain rate Sensitivity Index of i-th of loadingsequence；
--- the sum of the superposition of the average permanent strain rate of all loadingsequences, unit: μ ε/s；
N --- the total number of creep test loadingsequence；
2. compound average permanent strain rate CAPSR is calculated according to the following formula:
In formula:--- compound average permanent strain rate, unit: μ ε/s；
Ni--- the repetition in half-sine pulse period loads number in i-th of loadingsequence；
N --- the total number of creep test loadingsequence；
N ' --- the half-sine pulse period repeats the total degree of load in all loadingsequences of creep second stage；
3. compound creep stiffness modulus CCSM is calculated according to the following formula:
In formula:--- the equivalent stress that test specimen is subject to, unit: MPa；
σi--- the stress rank of i-th of loadingsequence, unit: MPa；
N --- all loadingsequences repeat load number in total；
Δεp--- the permanent strain that test specimen is accumulated when off-test, unit: 1；
N --- the total number of creep test loadingsequence；
Sc--- the compound creep stiffness modulus of test specimen, unit: MPa.
2. a kind of asphalt multisequencing dynamic creep experimental data processing according to claim 1 and analysis method,
It is characterized by: it is 2~4 that Butterworth LPF parameter setting described in step 1), which is respectively as follows: order, cutoff frequency
For 10~30Hz.
3. a kind of asphalt multisequencing dynamic creep experimental data processing according to claim 1 and analysis method,
It is characterized by: primary creep behavior described in step 1) is that creep migrates the phase, only comprising the examination under 1 preloading sequence effect
Sample deformation data；The creep second stage is creep stationary phase, includes the sample deformation number under the effect of multiple loadingsequences
According to.
4. a kind of asphalt multisequencing dynamic creep experimental data processing according to claim 1 and analysis method,
It is characterized by: the stress range of each loadingsequence is in 0.3~1.4MPa in creep second stage described in step 1)
Between, pulse width is between 0.1~0.5s, and the intermittent time is between 0~10s.
5. a kind of asphalt multisequencing dynamic creep experimental data processing according to claim 1 and analysis method,
It is characterized by: the sample frequency in step 2) in each half-sine pulse load action period is 200~1000Hz.
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