CN106894316A - A kind of method based on fiber-optic grating sensor detection asphalt pavement structure destruction - Google Patents
A kind of method based on fiber-optic grating sensor detection asphalt pavement structure destruction Download PDFInfo
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- CN106894316A CN106894316A CN201710114361.2A CN201710114361A CN106894316A CN 106894316 A CN106894316 A CN 106894316A CN 201710114361 A CN201710114361 A CN 201710114361A CN 106894316 A CN106894316 A CN 106894316A
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
-
- 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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- 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
- G01N2203/0003—Steady
-
- 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
-
- 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
- G01N2203/0075—Strain-stress relations or elastic constants
-
- 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
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
Abstract
The invention discloses a kind of method based on fiber-optic grating sensor detection asphalt pavement structure destruction, the method is comprised the following steps：1）One or more fiber-optic grating sensors are fixedly mounted on rut test piece surface；2）The test parameters of accelerated loading is set, and simulating rut by accelerating and loading test forms, real-time monitoring fiber-optic grating sensor；3）The strain value of fiber-optic grating sensor is monitored, the graph of relation of load number of times and surface of test piece strain value is made；4）Test specimen structure damage analysis：Test piece deformation destructiveness is analyzed by surface strain values.The present invention proposes a kind of simple to operate, Feasible degree asphalt pavement structure destructive test method high, and road pavement structure design and maintenance have great theory significance.Bituminous paving strain-responsive, process is simple, it is easy to implement, and recoverable are monitored using surface-type fiber Bragg grating strain sensor.
Description
Technical field
Pitch is detected the present invention relates to road performance assessment technology field, more particularly to a kind of fiber-optic grating sensor that is based on
The method of pavement structure destruction.
Background technology
Under the coupling of overload, heavily loaded overfrequency load and temperature, being become by structure usually occurs in bituminous paving early stage
There is crackle in the pavement cracking that shape causes, bituminous paving, should be repaired in time, and otherwise rainwater and other debris can enter surface layer
Structure and roadbed, accelerate road surface infringement.On the other hand, the existing highway layout specification of China is destroyed using stress as pavement structure
Performance detection index, and foreign countries then use and most the strain of structure partial characteristic can be reflected as design objective.Bituminous concrete material
The inhomogeneities of material causes it to there are stress raisers under load effect, when the tensile strength of asphalt material has been exceeded,
Will crack.For generation, the distribution situation of more intuitive and accurate monitoring crack, passed using fiber grating surface-type
Sensor monitoring asphalt pavement structure destruction has obvious social and economic benefits.Currently, asphalt roads strain value is detected both at home and abroad
Mainly there are two methods of fiber Bragg grating strain sensor and resistance strain plate, fiber-optic grating sensor accuracy of detection is high, anti-electricity
Magnetic disturbance ability is strong, but its price is high, cannot be reused after imbedding bituminous concrete using embedded-type sensor, therefore into
This problem significantly limit its application.Fiber grating surface-type strain transducer is arranged on surface of test piece and detects surface strain,
Solve the problems, such as that flush type is not reproducible to utilize, with economic benefit higher, and test data is accurate, can accurately reflect
Asphalt concrete structure destroys situation, and road pavement structure design and maintenance of surface have most important theories meaning.
The content of the invention
The technical problem to be solved in the present invention is for defect of the prior art, there is provided a kind of to be passed based on fiber grating
The method of sensor detection asphalt pavement structure destruction.
The technical solution adopted for the present invention to solve the technical problems is：One kind detects pitch based on fiber-optic grating sensor
The method of pavement structure destruction, comprises the following steps：
1) one or more fiber-optic grating sensors are fixedly mounted on rut test piece surface；The fiber-optic grating sensor
Installation site is：Each edge of fiber-optic grating sensor locating distance rut test piece is more than or equal to 30mm；Sensor distance rut test piece
Rolling region at least 30mm；When multiple sensors are installed, sensor spacing is more than 15mm；
2) test parameters of accelerated loading is set, and simulating rut by accelerating and loading test forms, real-time monitoring optical fiber light
Gate sensor；The test parameters of the accelerated loading includes temperature, rolling load, rolling speed；
3) strain value of fiber-optic grating sensor is monitored, the relation curve of load number of times and surface strain variations rate is made
Figure；
4) 4) test specimen structure damage analysis：By load number of times and the relation curve map analysis test specimen of surface of test piece strain value
Deformation failure degree, the rut test piece deformation failure degree is divided into three phases：Migration phase, stationary phase, breakdown time；
When surface of test piece strain value constantly increases, judge that rut test piece is in the migration phase, now, when rolling, pitch
The porosity on road surface reduces, and the change in displacement rate of rut constantly increases；
In the range of surface of test piece strain value certain numerical value fluctuate, and fluctuation amplitude it is smaller when, judge rut test piece be in
Stationary phase, now, bituminous paving hole is compacted substantially, and the transport ratio of rut is held essentially constant；
When surface of test piece strain value amplitude is undergone mutation, fluctuation amplitude is three times of stationary phase or so, judges rut test piece
In breakdown time, now, asphalt pavement structure destruction, rut transport ratio is increased dramatically.The strain jumping phenomenon can be used as pitch
Pavement structure destroys determination flag.
First stage (migration phase), under rolling effect, bituminous concrete porosity reduction, the transport ratio of test specimen increases rapidly
Greatly；Second stage (stationary phase), porosity is held essentially constant, and bituminous paving is compacted, and test specimen transport ratio is held essentially constant；
Phase III (breakdown time), as the continuous action of rolling causes pavement structure to destroy, the generation of crackle more accelerates this and breaks
Bad, there is drastic change in the transport ratio of test specimen.The rut and strain feelings of bituminous concrete test specimen under present invention combination actual measurement rut rolling
Condition, finds the three phases formed in rut, and test specimen change in displacement rate is different, and strain variation exists just with test specimen change in displacement rate
Dependency relation；Wherein, at initial stage phase III, its surface strain amplitude can undergo mutation, and reason is that pavement structure is destroyed,
Its overall mechanical properties declines, and increase is deformed under rolling effect, result in plastic strain amplitude mutation.Therefore, using fiber grating
It is feasible in theory that Sensor monitoring asphalt pavement structure destroys this method.
By such scheme, the step 1) in multiple sensors when, mounting means is as follows：Multiple sensors need to be arranged on and close
In reason installation region, to avoid the interference due to die trial to strain-responsive, while distance is more than 15mm between sensor.
By such scheme, the step 1) in fiber grating surface-type strain transducer physical attribute it is as follows：Size φ
10mm × 120mm, range ± 2000 μ ε, operating temperature -30~80 DEG C, resolution ratio 0.1%F.S, precision 0.3%F.S, tail optical fiber is
Armored optical cable, connector uses FC/APC forms.
By such scheme, the step 1) in fixed using base by the way of fixedly mount fiber-optic grating sensor.
By such scheme, the step 1) in during rut test piece is highway engineering pitch and Asphalt Mixture Experiment code
The standard rut test piece of T0703-2011 wheel milling process shapings or the combination rut test piece of simulated roadway structure.
By such scheme, the step 1) in rut test piece be divided into three surface layers of upper, middle and lower, cutting optimal bottom uses epoxy
Resin pastes limestone gravel to simulate base layer structure, and groundwork thickness is not more than 1cm.
By such scheme, the step 3) in the strain value of monitoring fiber-optic grating sensor be to be gathered by grid by (FBG) demodulator
The wave length shift that change long causes, and its Fourier space is converted into strain related physical quantity, while using temperature sensor
Temperature-compensating is done, the strain value that elimination is caused by temperature obtains the strain value after the denoising of fiber Bragg grating strain sensor.
By such scheme, the step 4) in, when rut test piece is in breakdown time, surface of test piece strain value amplitude occurs prominent
Become, fluctuation amplitude is three times of stationary phase.
The beneficial effect comprise that：
1. the present invention acquires rolling and acts on lower drip by fiber grating surface-type strain transducer and high accuracy (FBG) demodulator
A kind of strained situation of blue or green concrete sample, it is proposed that simple to operate, Feasible degree asphalt pavement structure destructive test method high,
Road pavement structure design and maintenance have great theory significance.From Economic and Efficiency Analysis, the technology to improve service life of road surface,
Resource consumption is reduced to have a clear superiority；On the other hand, the recycling of sensor also successfully solves fiber-optic grating sensor and exists
Cost Problems in terms of pitch strain detecting.From technical elements analysis, the test specimen structure failure judgment method of proposition is genuine and believable,
It is expected to turn into the main judgment basis of Pavement Structure Design.
2. fiber grating strain response data is accurately and reliably.
3. using surface-type fiber Bragg grating strain sensor monitoring bituminous paving strain-responsive, process is simple, it is easy to implement,
And recoverable.
Brief description of the drawings
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing：
Fig. 1 is the method flow diagram of the embodiment of the present invention；
Fig. 2 is the sensor fixing structure generalized section of the embodiment of the present invention, wherein：1- rut test piece upper layers；2-
Setscrew；3- fiber Bragg grating strain sensor bases；4- fiber Bragg grating strain sensors；H represents thickness above rut test piece
Degree；
Fig. 3 is the schematic view of the mounting position of the sensor in standard rut test piece of the embodiment of the present invention, and A represents that test specimen is wide
Degree；B represents rut rolling width；C, D represent size sensor；E is sensor from left hand edge and rut rolling region distance；F
It is sensor from lower edges position；
Fig. 4 is combining the schematic view of the mounting position of rut test piece for the sensor of the embodiment of the present invention；In figure：A, b are group
Close rut test piece length and width；C is rut rolling width；D is sensor from right hand edge and rut rolling region distance；E is sensor
From lower edges position；
Fig. 5 is that real road sensor peace turns reasonable area schematic, in figure：S is sensor distance rolling region and road
Road Edge is apart from minimum value；
Fig. 6 is the Plays rut test piece rutting depth of the embodiment of the present invention 1 with rolling layer variation diagram；
Fig. 7 is that the Plays rut test piece of the embodiment of the present invention 1 is strained with rolling layer variation diagram；
Fig. 8 be the embodiment of the present invention 2 in combine rut time rutting depth with rolling layer variation diagram；
Fig. 9 is strained with rolling layer variation diagram to combine the rut time in the embodiment of the present invention 2；
Figure 10 be the embodiment of the present invention 3 in combine rut time rutting depth with rolling layer variation diagram；
Figure 11 is strained with rolling layer variation diagram to combine the rut time in the embodiment of the present invention 3.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the present invention, limit is not used to
The fixed present invention.
As shown in figure 1,
Embodiment 1：
A kind of asphalt pavement structure destruction monitoring method based on fiber Bragg grating strain sensor, according to indoor wheel tracking test
The actual asphalt pavement structure of simulation, uses loading procedure, while using fiber grating table by accelerating and loading test simulated roadway
Face formula strain transducer real-time detection surface of test piece strain, reflects that test specimen rut acts on the road surface for causing and opens by surface strain
Split, with reference to the destruction of rut Displacement Analysis pavement structure.
It is inspection fiber grating surface-type strain transducer and the feasibility of monitoring method, according to road construction experience, institute
Rut test piece level is stated with AC-13 is used, pitch is domestic No. 70 matrix, and bitumen aggregate ratio 4.8% simulates pitch highway upper layer
Structure.Using《Highway engineering pitch and Asphalt Mixture Experiment code》(JTGE20-2011) T0702-2011 pitches mixing in
Material test specimen preparation method (wheel milling process) shaping rut test piece.Through inspection, the level meets road construction performance with property indices
It is required that.
It is Immersion Wheel Truck Test to test, 80 DEG C of temperature, load 0.7Mpa, oxygen concentration 21%, 42 times/min of compaction speed,
Rolling 15000 times,.
Surface strain detecting instrument uses fiber Bragg grating (FBG) demodulator, and its sample frequency is 25Hz, wavelength accuracy ± 1pm, energy
It is enough to monitor four sensors simultaneously.
Fiber grating surface-type strain transducer size φ 10mm × 120mm, range ± 2000 μ ε, operating temperature -30~
80 DEG C, resolution ratio 0.1%F.S, precision 0.3%F.S, tail optical fiber are armored optical cable, and connector uses FC/APC forms.Sensor can
Recycle.
A kind of method that the destruction of asphalt roads structure is estimated based on fiber Bragg grating strain sensor, it comprises the following steps：
1) making of rut test piece：With reference to《Highway engineering pitch and Asphalt Mixture Experiment code》Middle T0703-2011 wheels
Milling process is molded rut test piece；
Epoxy resin is used to paste limestone gravel to simulate base layer structure first, it is ensured that groundwork thickness is not more than 1cm.Press
Order is molded successively from the bottom up, determines that test specimen level is matched somebody with somebody and thickness according to actual pavement structure.
2) stickup of fiber grating surface-type strain transducer：
Carry out setscrew fixation in the install sensor by the way of base fixation, the position installed in sensor first
Mark, then with the impact drilling, finally installs setscrew and sensor, and mounting structure generalized section is shown in that Fig. 2, H are represented
Rut test piece upper layer thickness, is 40mm.In order to avoid the influence that edge effect is gathered to strain data, sensor selection is installed
It is more than or equal in the range of 30mm away from die edge；In order to avoid sensor is subject to crushing during test specimen rolling, because distance is taken turns
Grind region at least 30mm.In the present embodiment in surface of test piece middle position installation surface formula strain transducer, installation site is such as
Fig. 3, in figure：A represents specimen width, is 300mm；B represents rut rolling width, is 50mm；C, D represent size sensor, point
Wei not 120mm and 10mm；E be sensor from left hand edge and rut rolling region distance, be 42.4.mm；F is sensor from upper and lower
Marginal position, is 122.5mm；
Monitoring bituminous concrete test specimen strain-responsive situation.
3) the surface strain monitoring under rut rolling：Corresponding test parameters (temperature, rolling load, rolling speed are set
Deng), the deformation of real-time monitoring test specimen.
4) test specimen structure damage analysis：Test piece deformation destructiveness is reflected by surface strain rate, test specimen is embodied as
Rutting deformation is divided into three phases：Migration phase, stationary phase, breakdown time.The migration phase, when rolling, the porosity of bituminous paving subtracts
Small, the change in displacement rate of rut constantly increases, and corresponding strain value is also in increase；Stationary phase, bituminous paving hole is pressed substantially
Real, the transport ratio of rut is held essentially constant, and corresponding strain value fluctuates in the range of certain numerical value；Breakdown time, bituminous paving
Structure is destroyed, and rut transport ratio increases suddenly, and corresponding strain value is undergone mutation.The strain jumping phenomenon can be used as bituminous paving
Structure destroys determination flag.
Foundation based on fiber-optic grating sensor monitoring asphalt pavement structure destruction：Plastic strain amplitude is mutated.
Experimental test result such as Fig. 6 and Fig. 7：
Indoors in accelerating and loading test, the formation of rut is divided into three phases, migrates phase, stationary phase for Fig. 6 and Fig. 7 explanations
And breakdown time, its rut change in displacement rate is in first to increase the trend for tending towards stability afterwards, finally increasing again.Can according to strain curve
Know, different times plastic strain amplitude with rut change in displacement rate correlation, and root it is documented that, rut forms the 3rd rank
Road section surface structure is destroyed, and strain mutation occurs in now surface of test piece strain, and strain mutation can be destroyed as pavement fatigue
Judgment basis.
Strain mutation appears in rolling 12000 times or so, therefore can determine whether in 80 DEG C of temperature, rut load 0.7Mpa, oxygen
Gas concentration 21%, 42 times/min of rut speed, under experimental condition containing rainwater, the pavement structure is taken turns repeatedly by No. 12000 vehicles
Fatigue cracking occurs after stone roller effect, pavement structure is destroyed.
Embodiment 2：
A kind of asphalt pavement structure destruction monitoring method based on fiber Bragg grating strain sensor, according to indoor wheel tracking test
The actual asphalt pavement structure of simulation, uses loading procedure, while using fiber grating table by accelerating and loading test simulated roadway
Face formula strain transducer real-time detection rut test piece surface strain, reflects that the road surface that test specimen rut causes is opened by surface strain
Split, with reference to rutting depth analysis pavement track destruction.
The combination rut test piece is divided into three surface layers of upper, middle and lower, die trial size preferably to simulate actual pavement structure
1m×0.5m；Cutting optimal bottom uses epoxy resin to paste limestone gravel to simulate base layer structure, and groundwork thickness is not more than
1cm.Each level with being followed successively by AC-25, AC-20, AC-13 from top to bottom, thickness is respectively 8,6,4cm.In, cutting optimal use
90# matrix pitches, upper layer uses SBS modified pitch.Using《Highway engineering pitch and Asphalt Mixture Experiment code》(JTG
E20-2011 T0702-2011 bitumen mixture specimens preparation method (wheel milling process) shaping rut test piece in).Through inspection, the level is matched somebody with somebody
Property indices meet road construction performance requirement.
Experimental condition is, temperature 60 C, load 1.0Mpa, oxygen concentration 21%, ultraviolet ray intensity 79w/mm, rolling speed
24 times/min, rolling 30000 times, Water spray speed 10mm/h.
Surface strain detecting instrument be fiber Bragg grating (FBG) demodulator, its sample frequency be 25Hz, wavelength accuracy ± 1pm, can
Four sensors are monitored simultaneously.
Fiber grating surface-type strain transducer size φ 10mm × 120mm, range ± 2000 μ ε, operating temperature -30~
80 DEG C, resolution ratio 0.1%F.S, precision 0.3%F.S, tail optical fiber are armored optical cable, and connector uses FC/APC forms.Sensor can
Recycle.
A kind of above-mentioned method that the destruction of asphalt roads structure is estimated based on fiber Bragg grating strain sensor, it includes following step
Suddenly：
1) making of rut test piece：With reference to《Highway engineering pitch and Asphalt Mixture Experiment code》Middle T0703-2011 wheels
Milling process is molded rut test piece；
Epoxy resin is used to paste limestone gravel to simulate base layer structure first, it is ensured that groundwork thickness is not more than 1cm.Press
Order is molded successively from the bottom up, determines that rut level is matched somebody with somebody and thickness according to actual pavement structure.
2) stickup of fiber grating surface-type strain transducer：
Carry out setscrew fixation in the install sensor by the way of base fixation, the position installed in sensor first
Mark, then with the impact drilling, finally installs setscrew and sensor, and mounting structure generalized section is shown in accompanying drawing 2.In order to
Avoiding the collection of edge effect corresponding sides data influences, and sensor is selectively mounted to the scope more than or equal to 30mm away from die edge
It is interior；In order to avoid sensor is subject to crushing during test specimen rolling, because apart from rolling region at least 30mm.Embodiment selection is in examination
Part surface middle position installation surface formula strain transducer, installation site is shown in Fig. 4, in figure：A, b are combination rut test piece length and width,
Respectively 1000mm and 500mm；C is rut rolling width, is 70mm；D be sensor from right hand edge and rut rolling region away from
From being 40mm；E be sensor from lower edges position, be 472.5mm；Monitoring bituminous concrete test specimen strain-responsive situation.
3) the surface strain monitoring under rut rolling：Corresponding test parameters (temperature, rolling load, rolling speed are set
Deng), the deformation of real-time monitoring test specimen.
4) test specimen structure damage analysis：Test piece deformation destructiveness is reflected by surface strain rate, test specimen is embodied as
Rutting deformation is divided into three phases：Migration phase, stationary phase, breakdown time.The migration phase, when rut rolling, the hole of bituminous paving
Rate reduces, and the change in displacement rate of rut constantly increases, and corresponding strain value is also in increase；Stationary phase, bituminous paving hole is basic
It is compacted, rut transport ratio is held essentially constant, corresponding strain value fluctuates in the range of certain numerical value；Breakdown time, asphalt road
Face structure destruction, rut transport ratio increases suddenly, and corresponding strain value is undergone mutation.The strain jumping phenomenon can be used as asphalt road
Face structure destruction determination flag.
Foundation based on fiber-optic grating sensor monitoring asphalt pavement structure destruction：Plastic strain amplitude is mutated.
Experimental test result such as Fig. 8 and Fig. 9：
Can be drawn compared to standard rut test piece by Fig. 8 and Fig. 9, combination rut test piece under load effect rut and
Strained situation is more complicated, illustrates that combining rut test piece can preferably reflect the duty status on actual road surface.Work as rut simultaneously
When there is the phase III, plastic strain amplitude mutation can therewith occur in bituminous paving surface strain, and the point is still as bituminous paving car
The determination flag of rut destruction.
After strain mutation appears in rolling 25000 times, therefore can determine whether in temperature 60 C, rut load 1.0Mpa, oxygen
Concentration 21%, ultraviolet ray intensity 79w/mm, rut rolling 24 times/min, Spraying rates 10mm/h, under experimental condition containing rainwater, should
Pavement structure occurs fatigue cracking after rolling is acted on repeatedly by No. 25000 vehicles, and pavement structure is destroyed.And compared to
Standard rut test piece, combination rut test piece can preferably reflect the actual destruction situation on road surface.
Embodiment 3：
A kind of asphalt pavement structure destruction monitoring method based on fiber Bragg grating strain sensor, it is characterised in that according to room
Interior wheel tracking test simulates actual asphalt pavement structure, and loading procedure is used by accelerating and loading test simulated roadway, while utilizing
Fiber grating surface-type strain transducer real-time monitoring rut test piece surface strain, reflects that test specimen is drawn by rut by surface strain
The pavement cracking for rising, with reference to rutting depth analysis pavement track destruction.
The combination rut test piece is divided into three surface layers of upper, middle and lower, die trial size preferably to simulate actual pavement structure
1m×0.5m；Cutting optimal bottom uses epoxy resin to paste limestone gravel to simulate base layer structure, and groundwork thickness is not more than
1cm.Each level with being followed successively by AC-25, AC-20, AC-13 from top to bottom, thickness is respectively 8,6,4cm.In, cutting optimal use
90# matrix pitches, upper layer uses SBS modified pitch.Using《Highway engineering pitch and Asphalt Mixture Experiment code》(JTG
E20-2011 T0702-2011 bitumen mixture specimens preparation method (wheel milling process) shaping rut test piece in).Through inspection, the level is matched somebody with somebody
Property indices meet road construction performance requirement.
Experimental condition uses accelerating and loading test, 40 DEG C of temperature, rut load 0.7Mpa, oxygen concentration 21%, ultraviolet light
Intensity 79w/mm, 24 times/min of rolling speed, rolling number of times 30000 times.
Surface strain detecting instrument be fiber Bragg grating (FBG) demodulator, its sample frequency be 25Hz, wavelength accuracy ± 1pm, can
Four sensors are monitored simultaneously.
Fiber grating surface-type strain transducer size φ 10mm × 120mm, range ± 2000 μ ε, operating temperature -30~
80 DEG C, resolution ratio 0.1%F.S, precision 0.3%F.S, tail optical fiber are armored optical cable, and connector uses FC/APC forms.Sensor can
Recycle.
A kind of above-mentioned method that the destruction of asphalt roads structure is estimated based on fiber Bragg grating strain sensor, it includes following step
Suddenly：
1) making of rut test piece：With reference to《Highway engineering pitch and Asphalt Mixture Experiment code》Middle T0703-2011 wheels
Milling process is molded rut test piece；
Epoxy resin is used to paste limestone gravel to simulate base layer structure first, it is ensured that groundwork thickness is not more than 1cm.Press
Order is molded successively from the bottom up, determines that test specimen level is matched somebody with somebody and thickness according to actual pavement structure.
2) stickup of fiber grating surface-type strain transducer：
Carry out setscrew fixation in the install sensor by the way of base fixation, the position installed in sensor first
Mark, then with the impact drilling, finally installs setscrew and sensor, and mounting structure generalized section is shown in accompanying drawing 2.In order to
Avoiding collection of the edge effect on strain data influences, and sensor is selectively mounted to the scope more than or equal to 30mm away from die edge
It is interior；In order to avoid sensor is subject to crushing during test specimen rolling, because apart from rolling region at least 30mm.The patent is selected in test specimen
Surface middle position installation surface formula strain transducer, installation site is shown in that Fig. 5, S are sensor distance rolling region and road roadside
Edge, apart from minimum value, is 30mm, monitors bituminous concrete test specimen strain-responsive situation.
3) the surface strain monitoring under rut rolling：Corresponding test parameters (temperature, rolling load, rolling speed are set
Deng), the deformation of real-time monitoring test specimen.
4) test specimen structure damage analysis：Test piece deformation destructiveness is reflected by surface strain rate, test specimen is embodied as
Rutting deformation is divided into three phases：Migration phase, stationary phase, breakdown time.The migration phase, when rut rolling, the hole of bituminous paving
Rate reduces, and the change in displacement rate of rut constantly increases, and corresponding strain value is also in increase；Stationary phase, bituminous paving hole is basic
It is compacted, the transport ratio of rut is held essentially constant, corresponding strain value fluctuates in the range of certain numerical value；Breakdown time, pitch
Pavement structure is destroyed, and rut transport ratio increases suddenly, and corresponding strain value is undergone mutation.The strain jumping phenomenon can be used as pitch
Pavement structure destroys determination flag.
Foundation based on fiber-optic grating sensor monitoring asphalt pavement structure destruction：Plastic strain amplitude is mutated.
Experimental test result is as follows：
Due to the change of experiment condition, rut is caused the phase III do not occur, corresponding strain curve does not also occur
Strain mutation, illustrates in temperature 60 C, rut load 1.0Mpa, oxygen concentration 21%, ultraviolet ray intensity 79w/mm, rut rolling
24 times/min, Spraying rates 10mm/h, under experimental condition containing rainwater, the pavement structure by No. 30000 vehicles, make repeatedly by rolling
Be not in the pavement cracking caused by rut with rear pavement structure, pavement structure does not occur fatigue rupture.
Meanwhile, strain trend still conforms to rutting depth rate of change, and the rut slope of curve and strain rate are proportionate pass
System, therefore the purpose of the fatigue behaviour of monitoring bituminous paving can be reached by surface strain.
The performance detection of the asphalt pavement structure destruction methods based on fiber-optic grating sensor：Plastic strain amplitude mutation is used as drip
Blue or green pavement structure failure judgment mark, as a result shows the method accurately and reliably.
The present invention is applied to various actual asphalt pavement structures, level and matches somebody with somebody, and simulated test parameter (such as temperature, load) is not only
It is limited only to the condition in case, embodiment numerous to list herein.
It should be appreciated that for those of ordinary skills, can according to the above description be improved or converted,
And all these modifications and variations should all belong to the protection domain of appended claims of the present invention.
Claims (8)
1. it is a kind of that the method that asphalt pavement structure is destroyed is detected based on fiber-optic grating sensor, it is characterised in that including following step
Suddenly：
1) one or more fiber-optic grating sensors are fixedly mounted on rut test piece surface；The installation of the fiber-optic grating sensor
Position is as follows：Each edge of fiber-optic grating sensor locating distance rut test piece is more than or equal to 30mm；Sensor distance rut test piece
Rolling region at least 30mm；
2) test parameters of accelerated loading is set, and simulating rut by accelerating and loading test is formed, and real-time monitoring fiber grating is passed
Sensor；The test parameters of the accelerated loading includes temperature, rolling load, rolling speed；
3) strain value of fiber-optic grating sensor is monitored, the graph of relation of load number of times and surface of test piece strain value is made；
4) test specimen structure damage analysis：Broken by the relation curve map analysis test piece deformation of load number of times and surface of test piece strain value
Bad degree, the rut test piece deformation failure degree is divided into three phases：Migration phase, stationary phase, breakdown time；
When surface of test piece strain value constantly increases, judge that rut test piece is in the migration phase, now, when rolling, bituminous paving
Porosity reduce, the change in displacement rate of rut constantly increases；
In the range of surface of test piece strain value certain numerical value fluctuate, and fluctuation amplitude it is smaller when, judge rut test piece be in stabilization
Phase, now, bituminous paving hole is compacted substantially, and the transport ratio of rut is held essentially constant；
When surface of test piece strain value amplitude is undergone mutation, fluctuation amplitude is three times of stationary phase or so, judges that rut test piece is in
Breakdown time, now, asphalt pavement structure destruction, rut transport ratio is increased dramatically.
2. it is according to claim 1 that the method that asphalt pavement structure is destroyed, its feature are detected based on fiber-optic grating sensor
Be, the step 1) in multiple sensor when, mounting means is as follows：When multiple sensors are installed, sensor spacing is more than
15mm。
3. it is according to claim 1 that the method that asphalt pavement structure is destroyed, its feature are detected based on fiber-optic grating sensor
Be, the step 1) in fiber grating surface-type strain transducer physical attribute it is as follows：Size φ 10mm × 120mm, amount
Journey ± 2000 μ ε, operating temperature -30~80 DEG C, resolution ratio 0.1%F.S, precision 0.3%F.S, tail optical fiber is armored optical cable, connection
Head uses FC/APC forms.
4. it is according to claim 1 that the method that asphalt pavement structure is destroyed, its feature are detected based on fiber-optic grating sensor
Be, the step 1) in using base fix by the way of fixedly mount fiber-optic grating sensor.
5. it is according to claim 1 that the method that asphalt pavement structure is destroyed, its feature are detected based on fiber-optic grating sensor
Be, the step 1) in rut test piece be T0703-2011 wheel milling process in highway engineering pitch and Asphalt Mixture Experiment code
The standard rut test piece of shaping or the combination rut test piece of simulated roadway structure.
6. it is according to claim 1 that the method that asphalt pavement structure is destroyed, its feature are detected based on fiber-optic grating sensor
Be, the step 1) in rut test piece be divided into three surface layers of upper, middle and lower, limestone is pasted in cutting optimal bottom using epoxy resin
To simulate base layer structure, groundwork thickness is not more than 1cm to rubble.
7. it is according to claim 1 that the method that asphalt pavement structure is destroyed, its feature are detected based on fiber-optic grating sensor
Be, the step 3) in the strain value of monitoring fiber-optic grating sensor be to gather to change the ripple that causes by grid are long by (FBG) demodulator
Drift long, and its Fourier space is converted into strain related physical quantity, while doing temperature-compensating using temperature sensor, eliminate
The strain value caused by temperature, obtains the strain value after the denoising of fiber Bragg grating strain sensor.
8. it is according to claim 1 that the method that asphalt pavement structure is destroyed, its feature are detected based on fiber-optic grating sensor
It is, the step 4) in, when rut test piece is in breakdown time, surface of test piece strain value amplitude is undergone mutation, and fluctuation amplitude is big
In 3 times of stationary phase surface of test piece strain value amplitude fluctuations.
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