CN104727207B - A kind of semi-rigid base asphalt pavement structure maintenance method for designing - Google Patents
A kind of semi-rigid base asphalt pavement structure maintenance method for designing Download PDFInfo
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- CN104727207B CN104727207B CN201510150613.8A CN201510150613A CN104727207B CN 104727207 B CN104727207 B CN 104727207B CN 201510150613 A CN201510150613 A CN 201510150613A CN 104727207 B CN104727207 B CN 104727207B
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- 239000010426 asphalt Substances 0.000 title claims abstract description 61
- 238000012423 maintenance Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000013461 design Methods 0.000 claims abstract description 28
- 238000012937 correction Methods 0.000 claims abstract description 19
- 238000012360 testing method Methods 0.000 claims abstract description 12
- 238000005336 cracking Methods 0.000 claims abstract description 10
- 230000007613 environmental effect Effects 0.000 claims abstract description 7
- 238000005070 sampling Methods 0.000 claims abstract description 6
- 238000001514 detection method Methods 0.000 claims abstract description 4
- 238000005259 measurement Methods 0.000 claims abstract description 4
- 238000009661 fatigue test Methods 0.000 claims abstract description 3
- 239000000463 material Substances 0.000 claims description 6
- 230000032683 aging Effects 0.000 claims description 4
- 238000011835 investigation Methods 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 claims description 3
- 230000035882 stress Effects 0.000 claims description 3
- 238000000205 computational method Methods 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 3
- 239000011295 pitch Substances 0.000 description 3
- 230000002929 anti-fatigue Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009533 lab test Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010205 computational analysis Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Classifications
-
- 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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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Road Repair (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a kind of semi-rigid base asphalt pavement structure maintenance method for designing, it is characterized in that, the method comprises the following steps: according to pavement condition index PCI satisfy the need table cracking situation grade, the bituminous paving medium and above for cracking situation coordinates road surface core boring sampling by FWD FWD, it is thus achieved that the design parameter of each structure sheaf of road surface；Described parameter includes thickness and the modulus of each structure sheaf in old road；The fatigue behaviour of detection overlay asphalt, can be by test volume parameter and bring empirical equation into and estimate, it is possible to obtained by indoor fatigue test actual measurement；Set up 3D road surface and overlay structural finite element model, maximum equivalent strain stress bottom asphalt overlay at calculating crack locationVM, by εVMSubstitute into fatigue equation and use environmental correction coefficient road pavement to be revised fatigue life, finally giving the thickness of asphalt overlay.
Description
Technical field
The present invention relates to a kind of asphalt pavement maintenance method for designing, be specifically related to the structure of a kind of semi-rigid asphalt pavement
Property maintenance method for designing.
Background technology
Ending for the end of the year 2013, the highway of China has broken through 100,000 kilometers, and total kilometrage jumps the first in the world of crouching.From previous generation
Discipline the nineties starts, and China enters the period that highway construction is fast-developing, and within especially 1998, implementation of China is positive
Financial policy since, more than highway construction on-stream item, investment quantity big highly visible.State is not only in highway construction
The pillar industry of people's economy, especially the consumption rich and influential family of the energy and resource, the arduousness being faced with resources conservation and environmental protection is appointed
Business and substantial responsibility.
Semi-rigid asphalt pavement as the primary structure form on highway in China road surface, its usability in life cycle
Can directly determine the service level of road network.Under the repeated action of traffic loading and natural cause, pavement structure performance by
Gradually decline, ultimately result in and cannot meet load use requirement.Meanwhile, for meeting the ever-increasing volume of traffic, it is necessary to take
Corresponding reinforcement and reconstructional measures, make the structural behaviour on road surface be recovered, even improve.It is estimated that current China is every
Year there are about the bituminous paving of 12% to need repairing, and the structural maintenance method for designing of domestic routine is substantially according to newly-built
Mechanical response bottom each structure sheaf is simply checked by the mentality of designing in the middle of asphalt pavement design criterion, design objective mistake
In single, it is impossible to the service life after reflection old road resurfacing maintenance.Therefore, it is necessary to enter one on the basis of existing research
Step proposes the structural maintenance method for designing of semi-rigid asphalt pavement, difference maintenance program when specifying Highway design
Corresponding service life, so that highway engineering maintenance decision is more scientific and reasonable.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the present invention provides a kind of semi-rigid asphalt pavement
Structural maintenance method for designing, the rebuilt pavement structure service life corresponding by calculating different pitches layer thickness, point
The reasonable thickness of analysis bituminous paving, solves the deficiencies in the prior art.
Technical scheme: for achieving the above object, the technical solution used in the present invention is: a kind of semi-rigid asphalt pavement
Structural maintenance method for designing, it is characterised in that the method comprises the following steps: satisfy the need according to pavement condition index PCI
Mark cracking situation is graded, and the bituminous paving medium and above for cracking situation is joined by FWD FWD
Close road surface core boring sampling, to obtain the parameter of each structure sheaf of road surface；Described parameter includes thickness and the modulus of each structure sheaf；
The fatigue properties of asphalt mixture of asphalt overlay (4) can be by test volume parameter and bring empirical equation into and estimate, also
Can be obtained by indoor fatigue test actual measurement；Set up 3D road surface and overlay structural finite element model, calculate crack (5) position
Bottom, place's asphalt overlay (4) maximum equivalent strain stressVM, by εVMSubstitute into fatigue equation and use environmental correction coefficient pair
Fatigue life of pavement is revised, and finally gives (4) thickness of asphalt overlay.
Further, each structure sheaf of road surface includes roadbed (1), old road semi-rigid type base (2) and old road asphalt surface course
(3)；
Obtain the parameter of each structure sheaf of described road surface method particularly includes: by FWD FWD inverse or employing
Damage detection mode and obtain roadbed (1), old road semi-rigid type base (2), the modulus of resilience on old road asphalt surface course (3),
And obtain road surface each layer thickness parameter by GPR GPR or core boring sampling mode, overlay setting of maintenance as road surface
Meter parameter；Described modulus and thickness should using there is 95% fraction lower tantile as parameter typical value.
Further, the fatigue behaviour evaluation method of repaving asphalt coat (4) compound, method particularly includes:
Asphalt after completing for mix-design carries out indoor girder repeated bend test and obtains its fatigue resistance
Can, according to result of the test to fatigue equation formula Nf=a (1/ ε0)bIn relevant parameter be modified；In formula, NfFor adding
The Repeated Loading number of times carried, ε0For the stretching strain of asphalt girder bottom centre position, a, b are material
Fatigue behaviour parameter.
Further, bottom, crack (5) position asphalt overlay (4) maximum equivalent strain stressVMComputational methods tool
Body is for setting up 3D FEM model, and brings following formula into and calculate:
ε in formula1、ε2、ε3Represent the first principal strain, the second principal strain and the 3rd principal strain respectively.
Further, the circular of environmental correction coefficient is: the investigation on-site meteorological data of highway engineering,
Described meteorological data includes the design maximum temperature of locality, design minimum temperature and the monthly mean temperature of locality；Described set
Meter maximum temperature is local nearly 7 days temperature on average the highest；Described design minimum temperature is local average annual accumulated temperature；Root
Aging correction factor, temperature correction coefficient and on-the-spot correction factor is calculated respectively according to meteorological data.
Beneficial effect: the present invention, based on 3D finite element stimulation, sets up semi-rigid asphalt pavement and overlays finite element
Model, it is proposed that asphalt pavement structure maintenance method for designing and step, it is adaptable to the old asphalt pavement of different regions is entered
Row Overlay design and checking computations, determine suitable thickness according to the actual pavement usage situation plan on road surface service life.
Accompanying drawing explanation
Fig. 1 is the required overlay pavement structure 3D model schematic set up of the present invention；
Fig. 2 is the flow chart of the present invention.
In figure: 1-roadbed, 2-old road semi-rigid type base, 3-old road asphalt surface course, 4-repaving asphalt coat, 5-crack.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is further described.
It is a kind of semi-rigid base asphalt pavement structure maintenance method for designing as depicted in figs. 1 and 2, in conjunction with explanation
The present invention is done further description by book accompanying drawing and example:
(1) according to formula 1, the serious cracking degree of employing pavement condition index PCI evaluation old road asphalt surface course 3:
PCI=100-15 × DR0.412 (1)
In formula, DR is the comprehensive breakage rate in road surface, and computing formula is:
DR=D/A=Σ Σ DijKij/A (2)
In formula, D is the comprehensive damaged area (m in section2), A is the gross area (m in section2), DijIt is that the i-th class is damaged
Actual spoilage area (the m of the bad j level order of severity2), KijIt is the conversion coefficient of the i-th class damage j level order of severity, wherein
Longitudinally, laterally its damaged area of crack is fracture length (m) × 0.2m, rut breakage area be fracture length (m) ×
0.4m。
The number range of pavement condition index PCI is 0～100, and value is the biggest, and to represent pavement usage situation the best.Pavement behavior
Use standard as shown in table 1:
For the semi-rigid asphalt pavement that PCI index is more than middle rank, now table crack in road is less than 10%, it is adaptable to
The bituminous paving of the present invention overlays maintenance method for designing；As PCI index is only secondary, difference etc., preferably by bituminous paving milling weight
Repair, now can be directly with reference to the design specification of newly-built bituminous paving.
(2) damage detection mode by FWD FWD inverse or employing and obtain the modulus of resilience of ground surface material,
And obtain road surface each layer thickness parameter by GPR GPR or core boring sampling mode, overlay setting of maintenance as road surface
Meter parameter.During the modulus of resilience detects, the position that pavement cracking degree is serious, resilience mould should be detected as much as possible
Amount and thickness should using there is 95% fraction lower tantile as design parameter typical value.
(3) the investigation on-site meteorological data of highway engineering, it is thus achieved that local design maximum temperature (7 days average air the highest
Temperature) and design minimum temperature (average annual accumulated temperature), and the monthly mean temperature of locality.
(4) selection of overlay asphalt mixture material and performance test.The Reflective Cracking Resistance of repaving asphalt coat 4 with
The anti-fatigue performance of asphalt is closely related.For the engineering project of conditions permit, preferably complete for mix-design
After asphalt carry out indoor girder repeated bend test and obtain its anti-fatigue performance, according to result of the test to fatigue side
Relevant parameter in formula 3 is modified:
Nf=a (1/ ε0)b (3)
In formula, NfFor the Repeated Loading number of times loaded, ε0Should for drawing of asphalt girder bottom centre position
Becoming, a, b are the fatigue behaviour parameter of material.
The fatigue equation of asphalt also can record its volume parameter by laboratory test, rule of thumb formula (formula 4～
Formula 7) calculate:
Nf=2.738 × 105×e0.077VFB(ε0)-3.624(S0")-2.72 (4)
S0=8.56 (G0)0.913 (5)
S0"=81.125 (G0”)0 . 725 (7)
Wherein, VFB is pitch saturation degree (%), ε0For tension strain at base of asphalt layer, S0" for loss modulus.S0" surveying
During examination, the test specimen that girder repeated bend test uses is 6.35cm width, 5.1cm height, the girder of 38.1cm length, 3 points
Load and support across footpath 35.6cm.
(5) the maximum equivalent strain stress containing position, crack 5 bottom asphalt overlay 4 is calculatedVM.Due to old before maintenance
There are to a certain degree crack 5 in road asphalt surface course 3, after overlaying maintenance, bottom the repaving asphalt coat 4 at crack location
Mechanical response relatively big, be easily caused generation and the extension of reflection crack.Therefore, must be by setting up 3D road surface finite element mould
Type (Fig. 1), brings in the middle of model by the actual measurement parameter in step (2), containing crack 5 bottom checking computations repaving asphalt coat 4
The maximum equivalent strain stress of positionVM, εVMDefinition such as formula 8:
In formula, εVMStrain for maximum equivalent, ε1、ε2、ε3It is the first principal strain, the second principal strain and the 3rd principal strain.
(6) computing environment correction factor.Environmental correction coefficient is divided into aging correction factor AF, temperature according to the difference of function
Degree correction factor TF and on-the-spot correction factor FF, respectively according to formula 9～formula 12
AF=0.0363Tmax+0.3 (9)
TF=0.09RCT+2.55 (10)
RCT=Tmin+0.5(Tav-mean-Tmin) (11)
FF=e0.2303PC (12)
In formula, TmaxFor design maximum temperature, TminFor design minimum temperature, Tav-meanFor the average of monthly mean temperature,
RCT is crack reflection temperature, DEG C；PC is fracture spacing, %.
(7) standard axle load effect number of times ESALs is calculated.
ESALs=AF × TF × FF × a × (1/ εVM)b (13)
Embodiment: as a example by the highway engineering maintenance and reconstruction engineering of East China, by investigating the road table cracking situation on old road, really
Road table-like condition indices P CI=60 of Ding Gai highway, is rated medium, can carry out former road surface by overlaying new asphalt surface course
Maintenance.Use FWD to carry out deflection test and inverse obtains old pavement parameter of structure design, roadbed 1 resilience
Modulus E0=50MPa, equivalent modulus of resilience E of old road semi-rigid type base 21=2000MPa, groundwork thickness H1=0.5m,
Modulus E of Bituminous concrete surface surface layer 32=3500MPa, thickness H2=0.18m.The asphalt that repaving asphalt coat 4 uses
AC13, obtains its dynamic bending rollering modulus E by laboratory test3=4000MPa, and tried by indoor girder flexural fatigue
Relevant parameter a, b in running repair just its fatigue equation formula (3), obtains its fatigue equation such as formula 14:
Nf=6.45 × 1020(ε0)-5.93 (14)
Setting up semi-rigid type base 3D FEM model (Fig. 1), repaving asphalt coat 4 design thickness is H3, calculate crack 5
Top maximum equivalent strain stressVM, different thickness H3Corresponding εVMAs shown in table 2.
The meteorological data that investigation is local, obtains this area's design maximum temperature TmaxIt is 45 DEG C, designs minimum temperature Tmin
For-10 DEG C, monthly mean temperature average Tav-meanIt it is 20 DEG C.Calculate aging correction factor AF, temperature correction coefficient respectively
TF and on-the-spot correction factor FF, and the fracture spacing PC value in latter stage design period is set to 5%, carry out computational analysis.
Substitution formula 9～formula 12, respectively obtain AF=1.9335, TF=2.65, RCT=60, FF=3.163.Comprehensive data above,
Obtain different fatigue life corresponding to thickness as shown in table 2, according to Pavement Design axle load effect number of times in table 2
I.e. can determine that the reasonable thickness of bitumen layer.
The service life of table 2 different pitches layer thickness
The above is only the preferred embodiment of the present invention, it should be pointed out that: for those skilled in the art
For, under the premise without departing from the principles of the invention, it is also possible to make some improvements and modifications, these improvements and modifications are also
Should be regarded as protection scope of the present invention.
Claims (5)
1. a semi-rigid base asphalt pavement structure maintenance method for designing, it is characterised in that the method includes following
Step: grade, for the cracking medium and above drip of situation according to pavement condition index PCI table cracking situation of satisfying the need
Blue or green road surface coordinates road surface core boring sampling by FWD FWD, it is thus achieved that the parameter of each structure sheaf of road surface；Described
Parameter includes thickness and the modulus of each structure sheaf in old road；The fatigue behaviour of asphalt overlay (4) compound passes through test body
Long-pending parameter is also brought into empirical equation and is estimated, or obtained by indoor fatigue test actual measurement；Set up 3D road surface and overlay knot
Structure FEM model, calculates asphalt overlay (4) bottom maximum equivalent strain stress above crackVM, by εVMSubstitute into fatigue
Equation also uses environmental correction coefficient road pavement to be revised fatigue life, finally gives (4) thickness of asphalt overlay.
2. a kind of semi-rigid base asphalt pavement structure maintenance method for designing as claimed in claim 1, its feature exists
In, each structure sheaf in described old road includes roadbed (1), old road semi-rigid type base (2) and old road asphalt surface course (3)；
Obtain the parameter of each structure sheaf in described old road method particularly includes: had by FWD FWD inverse or employing
Damage detection mode and obtain roadbed (1), old road semi-rigid type base (2), the modulus of resilience on old road asphalt surface course (3), and
Obtain each layer thickness in road surface by GPR GPR or core boring sampling mode, overlay the design parameter of maintenance as road surface；
Described modulus and thickness should using there is 95% fraction lower tantile as parameter typical value.
3. a kind of semi-rigid base asphalt pavement structure maintenance method for designing as claimed in claim 1, its feature exists
In, including the fatigue behaviour evaluation method of repaving asphalt coat (4) compound, method particularly includes:
Asphalt after completing for mix-design carries out indoor girder repeated bend test and obtains its fatigue resistance
Can, according to result of the test to fatigue equation formula Nf=a (1/ ε0)bIn relevant parameter be modified；In formula, NfFor adding
The Repeated Loading number of times carried, ε0For the stretching strain of asphalt girder bottom centre position, a, b are material
Fatigue behaviour parameter.
4. a kind of semi-rigid base asphalt pavement structure maintenance method for designing as claimed in claim 1, its feature exists
In, bottom, described crack (5) position asphalt overlay (4) maximum equivalent strain stressVMComputational methods for setting up 3D
FEM model, and calculate as the following formula:
ε in formula1、ε2、ε3Represent the first principal strain, the second principal strain and the 3rd principal strain respectively.
5. a kind of semi-rigid base asphalt pavement structure maintenance method for designing as claimed in claim 1, its feature exists
In, the circular of described environmental correction coefficient is: the investigation on-site meteorological data of highway engineering, described meteorology
Data includes the design maximum temperature of locality, design minimum temperature and the monthly mean temperature of locality；The described design highest temperature
Degree is local nearly 7 days temperature on average the highest；Described design minimum temperature is local average annual accumulated temperature；Provide according to meteorology
Material calculates aging correction factor, temperature correction coefficient and on-the-spot correction factor respectively.
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| CN105803909B (en) * | 2016-03-24 | 2017-11-03 | 北京国道通公路设计研究院股份有限公司 | The evaluation method of Asphalt Pavement Semi-rigid Base damaged condition |
| CN106284034B (en) * | 2016-08-11 | 2018-11-09 | 中公高科养护科技股份有限公司 | A kind of maintenance of surface method |
| CN107217576A (en) * | 2017-06-14 | 2017-09-29 | 广州市市政集团有限公司 | A kind of road quality detection method and system based on FWD and 3D GPRs |
| CN107389477B (en) * | 2017-06-14 | 2019-08-20 | 东南大学 | A kind of Layer Modulus of Asphalt Pavement reverse calculation algorithms |
| CN107798175B (en) * | 2017-10-10 | 2020-10-13 | 武汉理工大学 | Method for evaluating bearing capacity reserve of asphalt pavement in initial design stage |
| CN109799155B (en) * | 2019-01-22 | 2021-10-19 | 北京市道路工程质量监督站(北京市公路工程质量检测中心) | Existing asphalt pavement damage detection method |
| CN110119589B (en) * | 2019-05-21 | 2023-01-17 | 长沙理工大学 | Method for calculating reflection crack resistance of semi-rigid base asphalt pavement structure |
| CN110512501B (en) * | 2019-08-12 | 2021-02-19 | 武汉理工大学 | Crack disease evaluation method based on ground penetrating radar and FWD combined detection |
| CN112685930A (en) * | 2020-12-22 | 2021-04-20 | 江苏中路工程技术研究院有限公司 | Asphalt pavement structure reinforcement strategy determination method |
| CN113324848B (en) * | 2021-05-20 | 2022-07-15 | 山东大学 | Low-temperature bending strain test method for asphalt mixture trabecula test piece |
| CN115856069B (en) * | 2023-02-27 | 2023-05-05 | 昆明市公路局 | Asphalt pavement crack detection equipment and application method thereof |
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| Tóth | Seoyoung Cho |
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