CN101178340A - Asphalt pavement reflection crack propagation analog experiment device - Google Patents
Asphalt pavement reflection crack propagation analog experiment device Download PDFInfo
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- CN101178340A CN101178340A CNA2007100191475A CN200710019147A CN101178340A CN 101178340 A CN101178340 A CN 101178340A CN A2007100191475 A CNA2007100191475 A CN A2007100191475A CN 200710019147 A CN200710019147 A CN 200710019147A CN 101178340 A CN101178340 A CN 101178340A
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Abstract
The invention discloses a blacktop reflecting crack propagation analog experiment device which includes an environment box and a blacktop simulative platform and a reflecting crack propagation tester arranged in the environment box. The reflecting crack propagation tester includes a horizontal pulling fatigue test part, a vertical cutting fatigue test part and a data collecting part controlled by a microcomputer. The blacktop simulative platform includes a fixed testing vehicle (1) and a skip car frame (3) welded as a whole, and an active testing skip car (2) that can move horizontally on the skip car frame (3). The device can carry through pulling type and cutting type reflecting crack propagation expanding large scale dimension road structure experiment, analyze and compare the anti-crack effects of different blacktop structures or materials, acquire relevant calculating parameters and verify a theoretical calculating result, and provide a reliable testing basis for the blacktop structure design.
Description
Technical field
The present invention relates to the splitting resistance research field of highway engineering bituminous pavement, particularly propose a kind of asphalt pavement reflection crack propagation analog experiment device.
Background technology
From the seventies in 20th century, the research of road engineering bound pair asphalt pavement reflective cracking both at home and abroad is very active always, and understanding fully the production process of reflection crack and proposing the effectively preventing measure is two key problems that solve reflection crack.Therefore, the research to these two problems is the key point that improves the bituminous pavement permanance.Although static force analysis method, fracture and damage mechanics and Finite Element Method provide theoretical foundation for the reflection crack of analyzing asphalt mat, but because the complicacy of pavement structure and the factors such as variability of material parameter, only can not solve the research topic of reflection crack fully from theoretical analysis, there are certain gap in theoretical analysis and practical engineering application, for both are connected, must pass through shop experiment, within a short period of time, control main experimental factor and carry out analysis of experiments research, estimate the cracking resistance of different structure bituminous pavement.
In recent years, scientific research institution has carried out many shop experiments that are directed to asphalt pavement reflective cracking both at home and abroad, has developed corresponding testing equipment and test method, mainly can be divided into following a few class: 1) direct tensile test.Adopt the bituminous concrete stripping and slicing (be of a size of 45cm * 15cm * 7cm, include two kinds of breach and non-notch) that repeats after hydraulic pressure loading machine paves, rolls the scene to carry out the repeated stretching torture test as Canadian Ottawa scholar A.Shalaby; Holland H.V.Duijn on the fritter concrete slab making several pitch overlay structures such as unfilled bitumen concrete, non-woven polypropylene grid PP, polyester grid PET and glass mat Glasphalt carry out direct tensile test, contrast the stretch-proof ability of various materials.2) tension test indirectly.People such as the E.K.Tschegg of University Vienna Austria adopt diametral compression test to evaluate interlaminar bonding intensity and unit energy to failure.3) a crooked tensile fatigue test.The G.Dondi of Italy Bologna university adopts the pitch overlay of different materials such as no reinforcement bituminous concrete, non-woven geotextile, polypropylene GSZ and geotechnological knitmesh to carry out the three-point bending torture test, and the pitch overlay structure cracking resistance of different interlayers is estimated.The three point bending test of span centre notch test specimen has been carried out having in France Limoges civil engineering work laboratory, has obtained the coefficient C and the P value of calculating stress strength factor K and Paris rule, thereby utilizes da/dN=C (Δ K) p formula to calculate the fatigure failure life-span.Tongji University adopts non-incision that reinforcement layer test specimen arranged, and the overlay structure is respectively test specimen and the plain asphalt concrete that contains PEF stratum reticulare, non-woven geotextile, extraordinary steel wire grid interlayer, carries out static test in temperature under-3 ℃, 15 ℃ and 60 ℃ of conditions.4) shear fatigue test.The shear fatigue that South China College of Construction adopts homemade shear to simulate II type crack destroys.Portugal J.B.Sousa has adopted Cox﹠amp; The reflection crack instrument (CS7000 and CS7200 system) that Sons company produces has carried out shearing and drawing crack repeated load test to test specimen, has simulated the synergy in I type and II type crack.5) test plate (panel) torture test.Japan NAGATO.ABC and Univ Nottingham UK all adopted the torture test of test plate (panel) wheelmark, adopt the wheel simulation seam both sides of rolling inclined to one side load and in load action to fatigue effect that bituminous pavement produced.
Make a general survey of above various at the asphalt pavement reflective cracking torture test, mainly based on phenomenology method or mechanics method of approximation.From the angle of phenomenology method, analyzed the influence of pitch or sandwich material to the compound splitting resistance, do not relate to pavement structure and change the otherness that causes whole road surface cracking resistance; Angle from the mechanics method of approximation, looking asphalt is homogeneous, elasticity, isotropy, analyzed asphalt crack propagation rule, but its result of calculation and engineering physical presence are than big difference, therefore, two kinds of methods all thoroughly do not disclose damage, fatigue and the mechanism of fracture of asphalt under load action.
Asphalt collection viscoelastroplasticity and nonuniformity etc. are one, existing test method or computation model can not reflect truly comprehensively that the pavement structure reflection crack forms, expands and the fracture rule, develop a kind of asphalt pavement structure test instrument that its reflection crack forms, expands under load action that reflects more truly, have very important realistic meaning.
Summary of the invention
The object of the present invention is to provide a kind of asphalt pavement reflection crack propagation analog experiment device, this device can carry out stretch-draw type and the test of shearing-type reflection crack expansion vast scale size, analyze the effect of anti-cracking that compares different pitches pavement structure or material, obtain relevant calculating parameter and proof theory result of calculation, for Asphalt Pavement Structure Design provides reliable test basis.
In order to solve the problems of the technologies described above, technical scheme of the present invention, comprise environmental cabinet, and be placed on bituminous pavement analog platform and reflection crack tester in the environmental cabinet, it is characterized in that described reflection crack tester comprises horizontal direction stretch-draw torture test parts, vertical shearing torture test parts and data acquisition parts; Described bituminous pavement analog platform comprises the fixation test truck and the truck support that are welded as a whole, and the movement test truck that can move horizontally on the truck frame guide rail.
Described truck support is provided with guide rail, guide rail is provided with roller bearing, the movement test truck can move horizontally on this guide rail, and described movement test truck also has the connection crossbeam, and described fixation test truck and movement test truck are respectively arranged with truck baffle plate and baffle plate slot.
Described horizontal direction stretch-draw torture test parts comprise that described electro-hydraulic servo is carried out machine and provided power source by servo-hydraulic oil station by connecting the electro-hydraulic servo execution machine that crossbeam and connecting pin are connected with the movement test truck.
Described vertical shearing torture test parts comprise slip back-pressure crossbeam connected vertically successively, pulse fatigue testing machine, vertical load pressure head.
Described data acquisition parts comprise temperature sensor, the stress-strain data Acquisition Instrument of test pavement structure test layer and are installed in vertical load sensor on the pulse fatigue testing machine, are installed in the video camera on the slip back-pressure crossbeam.
Temperature regulator outside described environmental cabinet comprises installation heat circulation pipe within it and is installed in it is connected, and the temperature adjusting case is connected with temperature regulator by control line.
Adopt asphalt pavement reflection crack propagation analog experiment device, on the one hand, carry out horizontal direction stretch-draw torture test, simulation bituminous pavement basic unit and road surface Yin Wendu or humidity change to produce shrinks and buckling deformation, causes forming stretch-draw type reflection crack; On the other hand, carry out the vertical shearing torture test, simulation is under the effect of the inclined to one side load of wheel, owing to the excessive shearing-type reflection crack that causes bituminous pavement of the flexure difference of seam both sides; Both are dynamically torture test continuously, simulate by shop experiment, analyze the opening mode of different pavement, generation, expansion mechanism and the tired rule of shearing-type reflection crack, check the effect of anti-cracking of various different pitches pavement structures or material, and the size effect of basic crack is to the influence of reflection crack expansion.
The advantage that the technology of the present invention is outstanding is:
1) selects vast scale size pavement structure test layer for use, adopt baby roller to roll, guarantee its molding effect, can carry out stretch-draw type and shearing-type reflection crack propagation analog experiment near the actual road surface of engineering;
2) pavement structure test slabbing seam district arranges stress section and foil gauge, the stress field and the strain field in record crack district, reflect the response relation between stress, strain variation rule and the stress and strain of compound in the fatigue damage process, explored the mechanism that asphalt pavement reflective cracking forms, expands.
3) thickness of pavement structure test layer can change according to testing requirements, is convenient to study the cracking resistance of different pavement or material;
4) but both independent operating of vertical and horizontal direction load also can move simultaneously, be convenient to carry out the approximate simulation of coupled stress.
Description of drawings
Below in conjunction with the drawings and specific embodiments content of the present invention is described in further details.
Fig. 1 is test truck vertical view
Fig. 2 is a bituminous pavement analog platform structural drawing;
Fig. 3 is a reflection crack tester structural drawing;
Fig. 4 is a temperature adjusting case synoptic diagram;
Embodiment
The present invention mainly comprises the temperature adjusting case, is placed on bituminous pavement analog platform and reflection crack tester in the temperature adjusting case.
Referring to Fig. 1,2, the bituminous pavement analog platform comprises that fixation test truck 1 and truck support 3 are welded as a whole, support 3 is provided with guide rail 8, guide rail 8 is provided with roller bearing 6, movement test truck 2 can move on guide rail 8 by roller bearing 6, movement test truck 2 also has the crossbeam 7 of connection, so that be connected with horizontal gearing.Fixation test truck 1 and movement test material 2 are respectively arranged with truck baffle plate 4 and baffle plate slot 5, and when moulding pavement test structural sheet, truck baffle plate 4 is inserted in the truck baffle plate slot 5, and its height can be regulated according to the thickness of pavement test structural sheet 9.The long 1.2m of each test truck, wide 1.5m, truck baffle plate 4 height can be at 40cm with interior variation, and the truck support is welded with the 1cm steel plate, guarantees enough structural strength and rigidity, and two car bottom plate slits can change between 0～10mm.
Referring to Fig. 3, the reflection crack tester comprises by micro-processor controlled horizontal direction stretch-draw torture test parts, vertical shearing torture test parts and data acquisition parts.Horizontal direction stretch-draw torture test parts comprise that electro-hydraulic servo is carried out machine 18 and provided power source by the servo-hydraulic oil station 19 that is subjected to microcomputer 20 controls by connecting the electro-hydraulic servo execution machine 18 that crossbeam 7 and connecting pin 10 are connected with movement test truck 2.Vertical shearing torture test parts comprise slip back-pressure crossbeam 11 connected vertically successively, are subjected to pulse fatigue testing machine 14, the vertical load pressure head 13 of microcomputer 20 controls, and this vertical load pressure head 13 acts on the pavement structure test layer 9.The data acquisition parts comprise temperature sensor 17, the stress-strain data Acquisition Instrument 16 of imbedding pavement structure test layer 9 and are installed in vertical load sensor 15 on the pulse fatigue testing machine 14, are installed in the video camera 12 on the slip back-pressure crossbeam 11 that microcomputer 20 receives corresponding temperature, stress, strain, load and picture signal.
With reference to Fig. 4, the heat circulation pipe 22 in the environmental cabinet 21 is connected with temperature regulator 23, and temperature regulator 23 is connected with temperature adjusting case 24 by control line, and temperature adjusting case 24 is connected with external power supply.Environmental cabinet 21 is provided with heat-insulation and heat-preservation door and door lock, the pilot system that bituminous pavement analog platform and reflection crack tester are formed places in the environmental cabinet 21, the test preparatory stage, open the environment chamber door, paving structure test layer is closed then, by temperature adjusting case 24 temperature required condition is set, start-up temperature regulator 23 allows pilot system be under the ambient temperature conditions of setting.Environmental cabinet 21 long 2.5m, wide 1.8m, high 2m, the refrigerating capacity of temperature regulator 23 is 15000 kilocalories, and the environmental temperature regulate and control scope is between-20～60 ℃ in the case, and temperature error is ± 1 ℃.
Under the temperature conditions that environmental cabinet is set, the present invention can be simultaneously or is independently carried out the reflection crack propagation analog experiment of two aspects, on the one hand, carry out horizontal direction stretch-draw torture test, loaded pavement structure test layer 9 in the test truck, imbed temperature sensor 17, stress section in the stress-strain data Acquisition Instrument 16 and foil gauge, behind roller-compaction, start the insulation of environmental cabinet temperature regulating device, in the process of the test, the whether requirement up to specification of temperature sensor 17 monitoring test structural sheet temperature, movement test truck 2 is connected with electro-hydraulic servo execution machine 18 by connecting crossbeam 7 and connecting pin 10, electro-hydraulic servo is carried out machine 18 and is provided power source by servo-hydraulic oil station 19, and control movement test truck 2 is according to the testing requirements tangential movement, and microcomputer 20 monitoring servo-hydraulic oil station 19 operations and output are from the image of video camera 12; On the other hand, when carrying out the vertical shearing torture test, contact with slip back-pressure crossbeam 11 on the pulse fatigue testing machine 14, be connected with vertical load pressure head 13 down, and act on the pavement structure test layer 9, load information is imported microcomputer 20 into by sensor 15.The data that stress-strain data Acquisition Instrument 16 is gathered from stress section and foil gauge during test.
The horizontal hydraulic pressure gearing comprises servo-hydraulic oil station 19 and electro-hydraulic servo execution machine 18, the frequency of load application and displacement size all can be set by actual tests requirement and purpose, both can realize being interrupted and load, can carry out continuous to-and-fro movement again, the loading frequency scope is 1 time/minute～10 times/minute, and displacement range is 0～10mm.Electronics off-load, accumulator intelligence oil supply loop system, start-up system, the energising of off-load solenoid valve are adopted in servo-hydraulic oil station, oil pump output hydraulic oil process retaining valve is to the accumulator repairing, when pressure transducer detects when reaching system works pressure, the outage of off-load solenoid valve allows the oil pump off-load, rely on the energy storage of accumulator, keep, supply with outer oil circuit pressure oil-source, reduce under the return difference of system works pressure in limited time the energising of off-load solenoid valve when outer oil circuit pressure, oil pump is loaded, oil-filled to accumulator.Oil sources is through built-in proportional servo valve, and the displacement of its spool of step motor control to the machine of execution fuel feeding, is controlled the direction of travel and the displacement of execution machine, and pattern displacement pick-up unit real-time follow-up detects the displacement of topworks.
The WPS-500 type pulse fatigue testing machine that dynamic load in the vertical shearing torture test uses Jinan testing machine factory to produce, maximum load capability is 500kN, loading frequency is 60 times/min～540 time/min.The big I of load application is adjusted on demand, and numeral shows, loads number of times and shows automatically and record.Fatigue tester is hammered three parts into shape by main frame, switch board and the application of force and is formed, and auxiliary device has slip back-pressure crossbeam 11, load pressure head 13, torture test sensor 15 etc.
Stress section, foil gauge have been buried underground in the crack propagation district, use BX120-40AA type foil gauge in the stress test, length 40mm, resistance 120 Ω, strain detection testing device has P20R-17 type preset tandem-driving bogie, KH-17 type switch controller and YJ-16 type electric wire strain gauge, record stress, the strain variation situation of asphalt mat structural cracks district under vertical or horizontal loads is for the mechanical analysis of crack propagation provides test basis.
System controlled by computer and data output system are equipped with the software of special-purpose monitoring power system operation, can under environment such as WINDOWS98/2000/XP, move, when carrying out horizontal stretch-draw torture test, at first carry out system's zero clearing, according to testing requirements stretch-draw displacement, frequency are set, horizontal shift, thrust and pull-up curve, stretch-draw frequency and the number of run of interface display test truck can carry out the inquiry of oil pressure alert event and test figure during test, and external printer can be printed each test figure immediately; When carrying out the vertical shearing torture test, load size, frequency are set, control microcomputer interface display load peak value and valley, frequency and number of loading according to testing requirements.Simultaneously microcomputer is connected with the high-pixel camera machine, can be on the interface spread scenarios in Real Time Observation crack, test the laminar surface crack when connecting fully when pavement structure, the number of loading of correspondence is fatigue lifetime.
This test unit is simulated the influence to it of the actual loading situation of bituminous pavement and variation of ambient temperature preferably, the whole test structure adopts large-sized pavement structure, reflect actual pavement structure situation as far as possible truly, characterize the asphalt pavement structure cracking resistance, warranty test result's reliability, its practical application effect is remarkable.
Claims (7)
1. asphalt pavement reflection crack propagation analog experiment device, comprise environmental cabinet, and be placed on bituminous pavement analog platform and reflection crack tester in the environmental cabinet, it is characterized in that described reflection crack tester comprises horizontal direction stretch-draw torture test parts, vertical shearing torture test parts and data acquisition parts;
Described bituminous pavement analog platform comprises the fixation test truck (1) and truck support (3) that are welded as a whole, and the movement test truck (2) that can move horizontally on truck support (3).
2. asphalt pavement reflection crack propagation analog experiment device as claimed in claim 1, it is characterized in that, described truck support (3) is provided with guide rail (8), movement test truck (2) can move horizontally on guide rail (8), described movement test truck (2) also has connection crossbeam (7), and described fixation test truck (1) and movement test truck (2) are respectively arranged with truck baffle plate (4) and baffle plate slot (5).
3. asphalt pavement reflection crack propagation analog experiment device as claimed in claim 2 is characterized in that, institute's guide rail (8) is provided with roller bearing (6).
4. asphalt pavement reflection crack propagation analog experiment device as claimed in claim 2, it is characterized in that, described horizontal direction stretch-draw torture test parts comprise that described electro-hydraulic servo is carried out machine (18) and provided power source by servo-hydraulic oil station (19) by connecting the electro-hydraulic servo execution machine (18) that crossbeam (7) and connecting pin (10) are connected with movement test truck (2).
5. asphalt pavement reflection crack propagation analog experiment device as claimed in claim 4, it is characterized in that described vertical shearing torture test parts comprise slip back-pressure crossbeam connected vertically successively (11), pulse fatigue testing machine (14), vertical load pressure head (13).
6. asphalt pavement reflection crack propagation analog experiment device as claimed in claim 5, it is characterized in that described data acquisition parts comprise temperature sensor (17), the stress-strain data Acquisition Instrument (16) of test pavement structure test layer and are installed in vertical load sensor (15) on the pulse fatigue testing machine (14), are installed in the video camera (12) on the slip back-pressure crossbeam (11).
7. asphalt pavement reflection crack propagation analog experiment device as claimed in claim 1, it is characterized in that, temperature regulator (23) outside described environmental cabinet (2 1) comprises installation heat circulation pipe (22) within it and is installed in it is connected, and temperature adjusting case (24) is connected with temperature regulator (23) by control line.
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| CNA2007100191475A CN101178340A (en) | 2007-11-21 | 2007-11-21 | Asphalt pavement reflection crack propagation analog experiment device |
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| CNA2007100191475A CN101178340A (en) | 2007-11-21 | 2007-11-21 | Asphalt pavement reflection crack propagation analog experiment device |
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| CN101788431A (en) * | 2010-02-10 | 2010-07-28 | 长沙理工大学 | Device and method for testing shear performance of asphalt mixture |
| CN101793650A (en) * | 2010-03-18 | 2010-08-04 | 长安大学 | Accumulated deformation test instrument for functional layer asphalt and concrete between concrete supercrusts |
| CN102141506A (en) * | 2010-12-30 | 2011-08-03 | 长安大学 | Anti-stripping test device for surface aggregates of porous pavements |
| CN102393339A (en) * | 2011-11-24 | 2012-03-28 | 长安大学 | Test method and apparatus for simulating actual pavement cracking through crack |
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| CN112684157B (en) * | 2020-11-30 | 2023-09-22 | 重庆大学 | Asphalt pavement adhesive layer performance testing device |
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