CN1769859A - Instrument for testing shearing performance of pavement flexible material - Google Patents
Instrument for testing shearing performance of pavement flexible material Download PDFInfo
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- CN1769859A CN1769859A CN 200510042996 CN200510042996A CN1769859A CN 1769859 A CN1769859 A CN 1769859A CN 200510042996 CN200510042996 CN 200510042996 CN 200510042996 A CN200510042996 A CN 200510042996A CN 1769859 A CN1769859 A CN 1769859A
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Abstract
The invention relates to an apparatus for measuring shearing performance for pavement flexible material which comprises: control device, data collecting device 2, test sample constraint device 6, vertical moving device 4 and horizontal moving device 5; wherein the test sample 3 comprising two bottom-sealed half cylindrical cylinders that are bilateral symmetry to each other; the left half part of test sample 3 being placed on platform 1 which can move vertically, fixing by rectangle fixing clip plate and bolt; the right half part being placed on the bottom plate of another platform 1 which is on the same level with platform 1 moving vertically; the top of test sample 3 being fixed with semi-circular clip plate and bolt. The invention has the advantages that shear rate is adjustable.
Description
One, technical field:
The present invention relates to the specialized equipment that the road pavement material carries out permanent confined pressure vertical shearing test, utilize the control box automatic control level to put on the confined pressure of material test specimen, measure load and shear displacemant that also automatic collection vertically puts on test specimen, can be used for estimating the anti-shearing deformability of pavement flexible material; The instrument that specially refers to a kind of testing shearing performance of pavement flexible material.
Two, background technology:
Prior art and product shortcoming make a presentation: still do not have the instrument that is directly used in testing shearing performance of pavement flexible material at present.With the equipment of this unit affinity pavement structure shearing performance test device (exploitation of LLM Chang An University) is arranged and be usually used in the triaxial test device of material analysis.Pavement structure shearing performance test device is primarily aimed at road surface structare layer and carries out shear test, bonding state between structural sheet under the mensuration horizontal loads, square particle shape plate test specimen is adopted in test, can't the road pavement structure in the anti-shear abilities of flexible material under vertical wheel load effect such as graded broken stone, asphalt estimate.Though the triaxial test device can apply different confined pressures the strength of materials, modulus are measured, can't the simulated roadway flexible material actual detrusion process under the vertical effect of traffic load, and the direct anti-shear ability of evaluating material designing institute care; Though test specimen adopts cylindrical specimen, adopt the vibratory drilling method moulding close to have big difficulty with actual compaction technology, bigger simultaneously because sample dimensions is less for big material size effect influence, influence test accuracy.
Three, summary of the invention:
The objective of the invention is to overcome the shortcoming of above-mentioned prior art and product, utilize the control box automatic control level to put on the confined pressure of material test specimen, measure load and shear displacemant that also automatic collection vertically puts on test specimen, can be used for estimating the anti-shearing deformability of pavement flexible material, develop a kind of instrument of novel pavement flexible material shearing performance test, improve experimental precision
Technical solution of the present invention: instrument for testing shearing performance of pavement flexible material, comprise control, data collector 2 connects the force transducer 7 that is positioned at test specimen 3 tops through connecting lead 9, test specimen restraint device 6 internal fixation test specimens 3, fix vertical running gear 4 and walking in a horizontal state device 5 in the platform 1 of a left side, it is characterized in that: in the test specimen restraint device, test specimen 3 is by left-right symmetric, two half-cylindrical examination tubes moulding that seal the bottom surface, shaping test piece 3 examination tube left-half are placed on the platform 1 that can vertically walk, and by rectangle fixation clip and bolt, moulding sample 3 examination tube right half parts are placed on another platform 1 base plate, this platform 1 base plate be in same surface level above the platform 1 that can vertically walk, above the test specimen 3 with semicircle pressing plate and bolt.
Compared with prior art, the advantage and the effect that have of the present invention is as follows:
(1) can simulate pavement flexible material detrusion process under the actual traffic load effect.In the actual traffic load mechanism, flexible material in the road surface structare layer is wall pressure and vertical pressure acting in conjunction generation detrusion down in the horizontal direction, but the wheel load effect is influenced by tire-contact area, structural sheet Load Transfer ability etc., the vertical load that is delivered to flexible material layer only acts on local than small size, and the actual shear deformation zone that produces is at the compressive region and the interface of compressive region not; Because road surface structare layer horizontal direction size (width and length) is relatively large, the material horizontal direction is retrained by wall pressure during the distortion of regional area pressurized vertical shearing, can't move freely; Therefore utilize two semi-circular cylindrical samples to simulate compressive region and compressive region not respectively, two semicylinder interface simulation interfaces, the one-sided vertical load that applies of vertical running gear is simulated the wheel load effect, the walking in a horizontal state device applies the actual suffered horizontal direction wall pressure of wall pressure value simulation material that the structural sheet FEM (finite element) calculation obtains, can simulate actual detrusion process, realistic stressed and distortion situation.Pavement structure shearing performance test device and triaxial test device all can't be simulated this real process.
(2) test specimen adopts the body vibration moulding, and size can adjust, can actual to composition of simulation material and closely knit situation, and size effect is tested in elimination.Utilize vibration moulding, can simulate the compaction technology of material in the practice of construction process, the gradation composition of warranty test material is constant, packing and on-the-spot actual coincideing.The two semicircle die trial global formations of the actual employing of two semi-circular cylindrical samples, promptly utilize set bolt at first two semicircle die trials closely to be connected, the test specimen global formation and be fixed in test platform after remove set bolt again, this method was not only convenient but also guarantee the globality of test specimen.Sample dimensions can be adjusted according to the test material maximum particle diameter, eliminates the size effect influence.Adopting two semicircle die trial body vibration shaping test pieces, is one of crucial innovation of the present invention.
(3) shear rate is adjustable, can simulate different load action processes (load size, load action speed) and carry out the test evaluation of material anti-shear performance.
(4) develop experimental control device, control process of the test automatically, test figure is gathered and storage automatically, and can be connected with computing machine by serial ports and to carry out data transmission, and easy and simple to handle, artificial interference is little.Utilize Control Software to set controlled variable such as shear rate, wall pressure, automatically control test start and stop.The direct collecting scissors shear force of test figure, shear displacemant and wall pressure, frequency acquisition is adjustable, outputs to Excel and can carry out later stage calculating and handle.
Four, description of drawings:
Accompanying drawing is a structural representation of the present invention.
Number in the figure explanation: 1-pedestal, 2-control device, data collector, 3-test specimen, the vertical running gear of 4-, 5-walking in a horizontal state device, 6-restraint device, 7-force transducer, 8-support, 9-connecting line.
Five, embodiment:
As shown in drawings.Mainly form by control device, data collector 2, test specimen restraint device 6 and running gear four parts.Control device utilizes controller to control whole testing shear performance operating process, and parameters such as test specimen numbering, shear rate, wall pressure control can be set, and monitors load and shift value variation in real time, can be connected the transmission test data with computing machine by serial ports.Data acquisition is divided into two independently sub-devices, and one is the device of synchronous acquisition vertical shearing power and vertical displacement, and another is the power value harvester of wall pressure.Test specimen restraint device 6 is mainly used in and guarantees two semicircle test specimen maintenance levels, plumbness in the shear test process, and especially fixedly the test specimen upper and lower end parts is avoided test specimen shear history medium dip distortion, is the core apparatus of test; The upper end restraint device utilizes the counter-force screw that top semicircle steel plate is applied vertical load, and the bottom restraint device adopts pressing plate, set bolt, sensor pressure head etc. to apply vertical load and fixes.Running gear is made up of two parts, and a part is vertical running gear 4, can rise with the constant speed of setting and descend, and test specimen is applied vertical shearing power, and shear rate is adjustable; Another part is a walking in a horizontal state device 5, provides horizontal direction constant wall pressure to test specimen.
Principle of work: two half-cylindrical examination tubes moulding that test specimen 3 is sealed by left-right symmetric, bottom surface, the examination tube left-half of forming sample 3 is placed on pedestal 1 platform of vertical running gear 4, and by rectangle fixation clip and fixation clip bolt will try the tube left-half firmly be fixed on the platform of vertical running gear 4, apply acting force by the counter-force bolt to semicircle pressing plate again, left-half sample upper and lower end parts is tightly retrained.The walking in a horizontal state device 5 on right side can apply predefined wall pressure to sample by moving forward and backward of self, the half round post examination tube on the right has a vertical guide, be placed on vertical running gear 4 and be on the base plate of same surface level, place semicircle pressing plate above the sample, make the surface of pressing plate be in same plane, and then establish semicircle pressing plate at pad on the pressing plate and make between pressing plate and force transducer 7 pressure heads and closely contact with an examination tube end face.During test, apply certain wall pressure for sample 3 by walking in a horizontal state device 5 after, the bolt that fixing left and right sides two halves is tried tin is laid down, start vertical running gear, carry out the shear test of sample.Data collector 2 is collecting scissors shear force, wall pressure and shear displacemants in real time automatically, and preserve automatically, but also real time print raw data.When trial load reached peak value and falls back to setting, control device stopped test automatically.
The course of work: preliminary work---control box is opened, and connected the communication interface of wall pressure, shearing force, displacement, motor, energized will be installed initialization then, and check whether whole instrument is working properly.Specimen molding---test specimen 3 moulding on shaking table, the two parts that will try tube before the test earlier are linked to be an integral body with two bolts, are fixed on the vibration table surface with sleeve again.By calculated in advance good watering quantity and the material uniform mixing for preparing, vibration moulding.After specimen molding is good, sleeve is laid down, the examination tube that test specimen is housed is removed from shaking table.Test specimen is installed---and at first will try tube and be placed on together on the platform of vertical running gear, and guide rail be inserted in two draw-in grooves of walking in a horizontal state device; Then semicircle sheet steel is placed on sample end face near vertical running gear; Next will place one side of something examination tube on the platform of vertical running gear firmly fixing with the pressing plate screw rod, and load on first round thin steel of test, two ends of the half of sample of vertical running gear 4 one sides are constrained with the counter-force screw on the pressing plate; Add that at one side of something test end face that contacts with pressure head semicircle pressing plate makes force transducer 7 pressure heads tightly contact with pressing plate; Next start by walking in a horizontal state device 5, add wall pressure in advance for sample 3, lay down fixedly two halves examination tube screw again.On-test---set numbering, wall pressure variation range, the shear rate of test specimen 3, starter motor, control beginning shear test automatically.When shearing force to peaking and fall back to setting time test finishes automatically, vertical running gear just drops to the position before the test automatically, waits for the beginning of test next time.
Claims (1)
1, instrument for testing shearing performance of pavement flexible material, comprise control, data collector (2) connects the force transducer (7) that is positioned at test specimen (3) top through connecting lead (9), test specimen restraint device (6) internal fixation test specimen (3), fix vertical running gear (4) and walking in a horizontal state device (5) in the left side platform (1), it is characterized in that: in the test specimen restraint device, test specimen (3) is by left-right symmetric, two half-cylindrical examination tubes moulding that seal the bottom surface, shaping test piece (3) examination tube left-half is placed on the platform (1) that can vertically walk, and by rectangle fixation clip and bolt, moulding sample (3) examination tube right half part is placed on another platform (1) base plate, this platform (1) base plate be in same surface level above the platform (1) that can vertically walk, above the test specimen (3) with semicircle pressing plate and bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510042996 CN1769859A (en) | 2005-07-27 | 2005-07-27 | Instrument for testing shearing performance of pavement flexible material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510042996 CN1769859A (en) | 2005-07-27 | 2005-07-27 | Instrument for testing shearing performance of pavement flexible material |
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| CN1769859A true CN1769859A (en) | 2006-05-10 |
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| CN 200510042996 Pending CN1769859A (en) | 2005-07-27 | 2005-07-27 | Instrument for testing shearing performance of pavement flexible material |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104034607A (en) * | 2014-06-04 | 2014-09-10 | 同济大学 | Large-sized multifunctional geosynthetic material interface power direct shear apparatus |
| CN104035127A (en) * | 2014-06-04 | 2014-09-10 | 同济大学 | SDOF (single degree of freedom) vibrating table testing device |
| CN104316416A (en) * | 2014-11-18 | 2015-01-28 | 东南大学 | Semicircle loading direct shear test device and method for bituminous mixture |
| CN104655557A (en) * | 2013-11-21 | 2015-05-27 | 交通运输部科学研究院 | Equipment for measuring interlamellar jointing direct shear resistance between asphalt surface course and semi-rigid base |
| CN108801802A (en) * | 2018-06-05 | 2018-11-13 | 航天工程装备（苏州）有限公司 | A kind of device and test method for T connector crooked test |
-
2005
- 2005-07-27 CN CN 200510042996 patent/CN1769859A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104655557A (en) * | 2013-11-21 | 2015-05-27 | 交通运输部科学研究院 | Equipment for measuring interlamellar jointing direct shear resistance between asphalt surface course and semi-rigid base |
| CN104655557B (en) * | 2013-11-21 | 2018-03-02 | 交通运输部科学研究院 | The equipment that measurement asphalt surface course is coupled anti-staight scissors performance with semi-rigid type base interlayer |
| CN104034607A (en) * | 2014-06-04 | 2014-09-10 | 同济大学 | Large-sized multifunctional geosynthetic material interface power direct shear apparatus |
| CN104035127A (en) * | 2014-06-04 | 2014-09-10 | 同济大学 | SDOF (single degree of freedom) vibrating table testing device |
| CN104034607B (en) * | 2014-06-04 | 2016-04-06 | 同济大学 | Large-sized multifunction geosynthetics interface motivation direct shear apparatus |
| CN104316416A (en) * | 2014-11-18 | 2015-01-28 | 东南大学 | Semicircle loading direct shear test device and method for bituminous mixture |
| CN108801802A (en) * | 2018-06-05 | 2018-11-13 | 航天工程装备（苏州）有限公司 | A kind of device and test method for T connector crooked test |
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