CN106284036A - The evaluation methodology of highway pavement compactness based on GPR - Google Patents
The evaluation methodology of highway pavement compactness based on GPR Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/01—Devices or auxiliary means for setting-out or checking the configuration of new surfacing, e.g. templates, screed or reference line supports; Applications of apparatus for measuring, indicating, or recording the surface configuration of existing surfacing, e.g. profilographs
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Abstract
A kind of evaluation methodology of highway pavement compactness based on GPR, including: make different compactness highway pavement exemplar, exemplar comprises the exemplar that compactness is 100%；Obtaining each exemplar relative dielectric constant, compactness is that the dielectric constant of the exemplar of 100% is labeled as master body dielectric constant；Relative dielectric constant according to each exemplar and compactness, calculate the compactness index that different compactness is corresponding；Compactness is fitted with compactness index corresponding relation, it is thus achieved that fitting formula；Utilize GPR that highway pavement is detected；Calculate the dielectric constant of surveyed highway pavement according to testing result, calculate compactness index further；According to the compactness of fitting formula Yu requirement, evaluate the compactness situation of surveyed highway pavement.The present invention utilizes GPR, it is achieved that the Non-Destructive Testing to bituminous highway compactness of pavement, significant with detection for highway pavement Fast Evaluation in engineer applied.
Description
Technical field
The present invention relates to the radar exploration technique field, further to a kind of highway pavement compactness based on GPR
Evaluation methodology.
Background technology
Asphalt used by highway pavement is that Colophonium coordinates heated stirring to form, wherein by weight proportion with aggregate
Compactness of pavement is one of Engineering Quality Control and the of paramount importance index of maintenance.The size of compactness directly influences concrete
Thermostability, crack resistance, skid resistance, durability and permeability.
Owing to compactness is affected by many factors such as aggregate, Colophonium, air, the method measuring highway pavement compactness at present
And it is few." nuclear gauge measures compactness test method " (T0922-2008) and " Non-nuclear Density Gauge mensuration compactness
Test method " (T0925-2008) passes through nuclear gauge respectively and Non-nuclear Density Gauge measures area densities, by density
Assessment of Changes compactness, uses less in the current engineering of the method.The most the most frequently used Asphalt Pavement Compaction Degree Index detection method is
" dig pit and core drilling method measures road surface thickness test method " (T0912-2008), the method passes through destructive means at bituminous paving
Obtain a number of sample, measure the compactness of each sample and represent system-wide section Colophonium with this lot sample actual measurement compactness originally
The compactness of surface layer.
The compactness of bituminous concrete is mainly reflected by porosity and density, porosity and the difference of density
Can be presented as that the dielectric constant of bituminous concrete is different.GPR, as a kind of emerging non-destructive detecting device, has obtained
Arrive application widely, owing to GPR can accurately estimate road surface dielectric constant, therefore can be by visiting ground
The compactness on radar surveying road surface, the method evaluating compactness of pavement currently with GPR mainly comprises the steps that
(1) utilize GPR that highway pavement is detected, obtain road reflection amplitude A1；
(2) below GPR, sufficiently large metallic plate is laid on ground, is acquired with GPR, can be sent out
Penetrate amplitude Am；
(3) calculating highway pavement dielectric constant, the DIELECTRIC CONSTANT ε of road surface can be expressed as:
(4) think that dielectric constant section compactness on the low side there may be problem.
During realizing the present invention, it is found by the applicant that there is following technological deficiency in above-mentioned prior art:
Although nuclear gauge and Non-nuclear Density Gauge can measure area densities, but limited by equipment operation principle, make
Strictly demarcating with front needs, test process is loaded down with trivial details, inefficient, and typically should not be used in evaluation examination or arbitration.
Although boring and coring measurement method can preferably measure Asphalt Pavement Compaction Degree Index, but there are two open defects:
(1) bituminous paving can be caused damage, boring can affect Pavement Road Surface Quality too much by the method；
(2) choosing of bore position has stronger randomness, it is difficult to ensures the representativeness of sampling sample, is unfavorable for accurately commenting
Valency Asphalt Pavement Compaction Degree Index.
Existing GPR Compaction Degree Index Evaluation method make use of the relation between compactness and dielectric constant, but in reality
In engineer applied, the method two open defects of existence:
(1) determining between dielectric constant and compactness can only not studied according to assessing compactness of pavement situation qualitatively
Magnitude relation, therefore cannot accurately measure compactness of pavement；
(2) very big, even if areal even same road dielectric constant there is also discrete due to Load materials diversity
Property, therefore versatility is poor.
Summary of the invention
(1) to solve the technical problem that
In view of this, it is an object of the invention to provide a kind of highway pavement splitting evaluation side based on GPR
Method, to solve at least one technical problem above-described.
(2) technical scheme
For achieving the above object, the present invention provides the evaluation methodology of a kind of highway pavement compactness based on GPR,
Including step:
(1) make different compactness highway pavement exemplar, exemplar comprises the exemplar that compactness is 100%；
(2) obtaining each exemplar relative dielectric constant, compactness is that the dielectric constant of the exemplar of 100% is labeled as standard sample
Part dielectric constant；
(3) according to relative dielectric constant and the compactness of each exemplar, the compactness index that different compactness is corresponding is calculated；
(4) compactness is fitted with compactness index corresponding relation, it is thus achieved that fitting formula；
(5) utilize GPR that highway pavement is detected；
(6) testing result according to step (5) calculates the dielectric constant of surveyed highway pavement, calculates compactness further and refers to
Number；
(7) according to the compactness of fitting formula Yu requirement, the compactness situation of surveyed highway pavement is evaluated.
Preferably, described in step (1), highway pavement exemplar is Colophonium exemplar.
Preferably, in step (2), the acquisition of relative dielectric constant includes: utilize GPR to each exemplar to examining
Survey, obtain exemplar reflected amplitudes；Below GPR, metallic plate is laid on ground, is acquired with GPR, is launched
Amplitude；The relative dielectric constant of each exemplar is calculated according to exemplar reflected amplitudes with transmitting amplitude.
Preferably, step (3) includes sub-step: according to each exemplar DIELECTRIC CONSTANT ε ', wherein master body dielectric constant isCalculating each exemplar compactness index, exemplar compactness index can be tried to achieve by following formula:
Preferably, in step (4), fit approach carries out index for employing computer to compactness index and compactness data
Matching.
Preferably, step (5) including: utilizes GPR to detect highway pavement, obtains road reflection amplitude 4；
Below GPR, the metallic plate of the size radar wavelength more than five times is laid on ground, is acquired with GPR, permissible
Obtain launching amplitude Am。
Preferably, step (6) including: according to road reflection amplitude A1With transmitting amplitude Am, calculate highway pavement dielectric normal
Number, the DIELECTRIC CONSTANT ε of highway pavement is expressed as:
Calculate the average dielectric constant of whole piece highway pavementThen compactness index c is:
Preferably, step (7) including: the compactness that would be required to substitutes into fitting formula, obtains the compactness of corresponding requirement
Index, in pavement detection result, filters out and regards as doubtful defective section less than the section of the compactness index required.
(3) beneficial effect
Pass through technique scheme, it can be seen that the evaluation methodology of the present invention has the beneficial effects that:
(1) operation relative ease, it is adaptable to road surface is checked and accepted and check；
(2) it is a kind of lossless Compaction Degree Index Evaluation method, does not affect Pavement Road Surface Quality；
(3) road pavement can carry out continuous detecting, obtain comprehensive cover type and evaluate compactness of pavement level；
(4) detection compactness of pavement that can be quantitative, the defective section of fast searching compactness；
(5) difference in dielectric constant between different road surface, more accurately road pavement compacting can be overcome by compactness index
Degree is evaluated.
Accompanying drawing explanation
Fig. 1 is the flow chart of the evaluation methodology of embodiment of the present invention highway pavement based on GPR compactness.
Fig. 2 is the GPR pavement detection result figure of the present invention one specific embodiment.
Fig. 3 is highway pavement dielectric constant and the number of channels relation schematic diagram of the present invention one specific embodiment.
Fig. 4 is the highway pavement exemplar schematic diagram of the embodiment of the present invention.
Fig. 5 is the compactness index matching schematic diagram with compactness of the present invention one specific embodiment.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Accompanying drawing, the present invention is described in further detail.Following referring to the drawings explanation to embodiment of the present invention is intended to this
Bright present general inventive concept explains, and is not construed as a kind of restriction to the present invention.
Fig. 1 is the flow chart of the evaluation methodology of embodiment of the present invention highway pavement based on GPR compactness.This
The evaluation methodology of bright embodiment includes step:
(1) make different compactness highway pavement exemplar, exemplar comprises the exemplar that compactness is 100%.
Highway pavement exemplar described in this step can be conventional road surface exemplar, the composition of exemplar need not completely with treat
Surveying the identical of highway pavement, the compactness index of follow-up proposition can reduce due to sample composition and highway pavement to be measured as far as possible
The error that nonuniformity is brought.
In the present embodiment, compactness refer to dry density and the standard maximum dry density after soil or the compacting of other road-making materials it
Ratio, represents with percentage rate.
Optionally, road surface exemplar is Colophonium exemplar.
In the manufacturing process of exemplar, compactness scope should be chosen as far as possible and can cover highway pavement compactness to be measured, such as
The compactness of highway pavement to be measured is between 70-100%, then the exemplar minimum compactness chosen is preferably lower than 70%, maximum
Compactness is preferably 100%.
Manufactured size and the profile of exemplar are shown in Figure 4, keep identical with highway pavement to be measured as far as possible, and size
Upper (i.e. the circular diameter that the length of side radar wavelength more than five times, or metallic plate can cover)) should ensure that radar can detect generation
Echo-signal.
In specific embodiment shown in Fig. 4, having made 7 pieces of different compactness exemplars, compactness is respectively 85%, and 90%,
92%, 95%, 97%, 100%, 105% (compactness the most should be more than 100%, but indivedual measurement result exceedes
100% is normal, because maximum dry density is an experimental data, and the composition of material is the most stable, it is possible that meeting
This kind of situation occurs).
(2) obtaining each exemplar relative dielectric constant, compactness is that the dielectric constant of the exemplar of 100% is labeled as standard sample
Part dielectric constant.
In this step, the acquisition of relative dielectric constant includes:
Utilize GPR to each exemplar to detecting (such as: use mid frequency 1G, bandwidth 1G, sample rate
Each exemplar is detected by 51.2GHz time domain GPR), obtain exemplar reflected amplitudes；
Below GPR, sufficiently large metallic plate is laid on ground, is acquired with GPR, obtains launching amplitude；
The relative dielectric constant of each exemplar is calculated according to exemplar reflected amplitudes with transmitting amplitude.
(3) according to relative dielectric constant and the compactness of each exemplar, the compactness index that different compactness is corresponding is calculated；
In this step, according to each exemplar DIELECTRIC CONSTANT ε ', wherein master body dielectric constant isCalculate each exemplar
Compactness index, exemplar compactness index can pass through following formula (2) and try to achieve:
(4) compactness is fitted with compactness index corresponding relation, it is thus achieved that fitting formula.
In this step, fit approach does not limits, such as fitting of a polynomial or exponential fitting, preferably uses exponential fitting.
The mode of matching is: for existing some discrete points, obtain under least square meaning difference therewith under continuous function.
Fig. 5 is the compactness index matching schematic diagram with compactness of the present invention one specific embodiment, and compactness index is intended
Conjunction relational expression is:
Compactness=0.397+0.343e1.396C+2.725e-1.396C, wherein C is compactness index.
(5) utilize GPR that highway pavement is detected；
This step includes: utilize GPR to detect highway pavement (such as: use mid frequency 1G, bandwidth
1G, each exemplar is detected by sample rate 51.2GHz time domain GPR), obtain road reflection amplitude A1, the number of channels of detection
For hundreds of Zhi Ji ten thousand road.
Below GPR, sufficiently large metallic plate is laid on ground, is acquired with GPR, can be launched
Amplitude Am；This sufficiently large referring to ensures that radar can detect the length of side of generation echo-signal, the such as metallic plate thunder more than five times
Reach wavelength.
Fig. 3 is highway pavement dielectric constant and the number of channels relation schematic diagram of the present invention one specific embodiment.
In this figure, abscissa represents that number of channels, left side vertical coordinate represent dielectric constant.
(6) testing result according to step (5) calculates the dielectric constant of surveyed highway pavement, calculates compactness further and refers to
Number.
In this step, according to road reflection amplitude A1With transmitting amplitude Am, calculate highway pavement dielectric constant, highway pavement
DIELECTRIC CONSTANT ε be expressed as:
Calculate the average dielectric constant of whole piece highway pavementThen compactness index c is:
Fig. 3 is highway pavement dielectric constant and the number of channels relation schematic diagram of the present invention one specific embodiment.Right side in this figure
Vertical coordinate represents compactness index.
(7) according to the compactness of fitting formula Yu requirement, the compactness situation of surveyed highway pavement is evaluated.
In this step, the compactness that would be required to substitutes into fitting formula, obtains the compactness index of corresponding requirement, on road surface
In testing result, filter out and regard as doubtful defective section less than the section of the compactness index required.
According in the specific embodiment shown in Fig. 5, if the compaction requirement for this section of highway is 85%, then its corresponding pressure
Solidity index is 0.77.In pavement detection result, doubtful not conforming to is regarded as in the section filtering out compactness characteristic underflow 0.77
Lattice section.
Above, the embodiment of the present invention utilizes GPR, it is achieved that the Non-Destructive Testing to bituminous highway compactness of pavement, right
In engineer applied, highway pavement Fast Evaluation is significant with detection
Particular embodiments described above, has been carried out the purpose of the present invention, technical scheme and beneficial effect the most in detail
Describe in detail bright it should be understood that the foregoing is only the specific embodiment of the present invention, be not limited to the present invention, all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, should be included in the protection of the present invention
Within the scope of.
Claims (8)
1. the evaluation methodology of a highway pavement compactness based on GPR, it is characterised in that include step:
(1) make different compactness highway pavement exemplar, exemplar comprises the exemplar that compactness is 100%；
(2) obtaining each exemplar relative dielectric constant, compactness is that the dielectric constant of the exemplar of 100% is labeled as master body Jie
Electric constant；
(3) according to relative dielectric constant and the compactness of each exemplar, the compactness index that different compactness is corresponding is calculated；
(4) compactness is fitted with compactness index corresponding relation, it is thus achieved that fitting formula；
(5) utilize GPR that highway pavement is detected；
(6) testing result according to step (5) calculates the dielectric constant of surveyed highway pavement, calculates compactness index further；
(7) according to the compactness of fitting formula Yu requirement, the compactness situation of surveyed highway pavement is evaluated.
Evaluation methodology the most according to claim 1, it is characterised in that described in step (1), highway pavement exemplar is Colophonium
Exemplar.
Evaluation methodology the most according to claim 1, it is characterised in that in step (2), the acquisition of relative dielectric constant includes:
Utilize GPR to each exemplar to detecting, obtain exemplar reflected amplitudes；
Below GPR, metallic plate is laid on ground, is acquired with GPR, obtains launching amplitude；
The relative dielectric constant of each exemplar is calculated according to exemplar reflected amplitudes with transmitting amplitude.
Evaluation methodology the most according to claim 1, it is characterised in that step (3) including:
According to each exemplar DIELECTRIC CONSTANT ε ', wherein master body dielectric constant isCalculate each exemplar compactness index, exemplar
Compactness index can be tried to achieve by following formula:
Evaluation methodology the most according to claim 1, it is characterised in that in step (4), fit approach is for using computer pair
Compactness index and compactness data carry out exponential fitting.
Evaluation methodology the most according to claim 1, it is characterised in that step (5) including:
Utilize GPR that highway pavement is detected, obtain road reflection amplitude A1；
Below GPR, the metallic plate of the size radar wavelength more than five times is laid on ground, is acquired with GPR,
Can obtain launching amplitude Am。
Evaluation methodology the most according to claim 6, it is characterised in that step (6) including:
According to road reflection amplitude A1 and transmitting amplitude Am, calculate highway pavement dielectric constant, the DIELECTRIC CONSTANT ε table of highway pavement
It is shown as:
Calculate the average dielectric constant of whole piece highway pavementThen compactness index c is:
Evaluation methodology the most according to claim 1, it is characterised in that step (7) including:
The compactness that would be required to substitutes into fitting formula, obtains the compactness index of corresponding requirement, in pavement detection result, and sieve
Select and regard as doubtful defective section less than the section of the compactness index required.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106940370A (en) * | 2017-02-14 | 2017-07-11 | 北京市道路工程质量监督站 | Asphalt Pavement Compaction Degree Index detection method, apparatus and system |
| CN107063924A (en) * | 2017-04-21 | 2017-08-18 | 中水北方勘测设计研究有限责任公司 | A kind of method for being used to examine the roller compaction construction quality of impervious body containing over coarse grained soil |
| CN107576674A (en) * | 2017-08-30 | 2018-01-12 | 曲阜师范大学 | A kind of method based on GPR measurement soil compression degree |
| CN107894219A (en) * | 2017-11-16 | 2018-04-10 | 东南大学 | The antidote of radar thickness measuring error is coupled a kind ofly |
| CN108333096A (en) * | 2018-03-28 | 2018-07-27 | 东南大学 | A kind of asphalt concrete pavement porosity detection method based on Ground Penetrating Radar |
| CN109187668A (en) * | 2018-08-24 | 2019-01-11 | 武汉理工大学 | Compactness lossless detection method based on asphalt dielectric property |
| CN110512501A (en) * | 2019-08-12 | 2019-11-29 | 武汉理工大学 | A kind of crack disease evaluation method based on Ground Penetrating Radar and FWD joint-detection |
| CN114075825A (en) * | 2021-11-09 | 2022-02-22 | 华中科技大学 | Geological radar-based roadbed compaction quality rapid automatic detection method and equipment |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106940370A (en) * | 2017-02-14 | 2017-07-11 | 北京市道路工程质量监督站 | Asphalt Pavement Compaction Degree Index detection method, apparatus and system |
| CN107063924A (en) * | 2017-04-21 | 2017-08-18 | 中水北方勘测设计研究有限责任公司 | A kind of method for being used to examine the roller compaction construction quality of impervious body containing over coarse grained soil |
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| CN107894219B (en) * | 2017-11-16 | 2019-11-08 | 东南大学 | The antidote of radar thickness measuring error is coupled a kind ofly |
| CN108333096A (en) * | 2018-03-28 | 2018-07-27 | 东南大学 | A kind of asphalt concrete pavement porosity detection method based on Ground Penetrating Radar |
| CN109187668A (en) * | 2018-08-24 | 2019-01-11 | 武汉理工大学 | Compactness lossless detection method based on asphalt dielectric property |
| CN110512501A (en) * | 2019-08-12 | 2019-11-29 | 武汉理工大学 | A kind of crack disease evaluation method based on Ground Penetrating Radar and FWD joint-detection |
| CN114075825A (en) * | 2021-11-09 | 2022-02-22 | 华中科技大学 | Geological radar-based roadbed compaction quality rapid automatic detection method and equipment |
| CN114075825B (en) * | 2021-11-09 | 2022-08-02 | 华中科技大学 | Geological radar-based roadbed compaction quality rapid automatic detection method and equipment |
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