CN106769411B - Interlayer shear test device for pavement structure - Google Patents
Interlayer shear test device for pavement structure Download PDFInfo
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- CN106769411B CN106769411B CN201611205961.1A CN201611205961A CN106769411B CN 106769411 B CN106769411 B CN 106769411B CN 201611205961 A CN201611205961 A CN 201611205961A CN 106769411 B CN106769411 B CN 106769411B
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- 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
- G01N3/02—Details
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- 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
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention relates to the field of road engineering, in particular to an interlayer shearing test device for a pavement structure. The invention provides an interlayer shear test device for a pavement structure, which comprises a bracket, wherein a fixed slot position, a vertical tangential load loading device and a horizontal load loading device are arranged on the bracket, the vertical tangential load loading device and the horizontal load loading device are respectively positioned at two sides of the fixed slot position, the vertical tangential load loading device comprises a vertical tangential load loading base positioned on the bracket and a vertical tangential load loading slot position positioned on the vertical tangential load loading base, and the position of the vertical tangential load loading slot position is matched with the position of the fixed slot position. The interlayer shearing test device and the interlayer shearing test method for the pavement structure can well solve the problem of testing the interlayer state of the road engineering double-layer structure.
Description
Technical Field
The invention relates to the field of road engineering, in particular to an interlayer shearing test device for a road surface structure, and further provides an interlayer shearing test method for the road surface structure, wherein the test device and the test method can be used for interlayer shearing states of a road engineering double-layer structure.
Background
The high-performance asphalt surface layer (forming a composite pavement) is additionally paved on the old cement concrete pavement, so that the structural bearing capacity of the pavement can be effectively improved, the functional performance of the pavement is improved, and the pavement can be implemented under the condition of no stopping navigation, thereby being a main stream mode of additionally paving the airport pavement. The existing pavement in China is mainly made of cement concrete, wherein nearly 1/3 of the runway is paved in the next ten years, and the composite pavement and the number are expected to grow rapidly.
In the design and evaluation of composite pavement structures, the interlayer properties of asphalt paving and old cement concrete pavement are the core factors for determining the design and evaluation of rationality. In the conventional structural analysis, the layers of the composite pavement are generally assumed to be completely continuous or in a specific state, and due to the lack of effective correlation with actual conditions, the design and evaluation results are often unreasonable. In order to meet the requirement of building a large number of high-quality composite pavement, the problem of interlayer analysis and evaluation is urgently needed to be solved, the foundation is to master the mechanical properties and evolution rules of the interlayer, and the solution means is to detect the interlayer state of the pavement through an indoor test method.
At present, a unified test method for obtaining extensive certification is not established internationally aiming at the problem of the state between composite pavement layers, and the methods used in different countries are different in test steps, equipment, parameters and the like. Part of the existing equipment can only complete an interlayer shearing test under the action of a load, and is not in line with the stress condition of a road surface layer under the action of a large-scale airplane load. Therefore, the invention provides a scientific direct shear test device for detecting the interlayer state of the airport composite pavement by improving the existing instrument and equipment, and can be popularized to the interlayer state test application of the double-layer structure in the field of road engineering.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, an object of the present invention is to provide an interlaminar shear test device for a pavement structure, and further to provide an interlaminar shear test method for a pavement structure, which is used for solving the problems in the prior art.
To achieve the above object and other related objects, a first aspect of the present invention provides an interlayer shear test device for a pavement structure, including a bracket, on which a fixing slot, a vertical tangential load loading device and a horizontal load loading device are provided, where the vertical tangential load loading device and the horizontal load loading device are located on two sides of the fixing slot, respectively, and the vertical tangential load loading device includes a vertical tangential load loading base located on the bracket and a vertical tangential load loading slot located on the vertical tangential load loading base, and the position of the vertical tangential load loading slot is matched with the position of the fixing slot.
In some embodiments of the invention, the vertical tangential load loading slot is spaced apart from the fixed slot in a horizontal direction.
In some embodiments of the invention, the vertical tangential load loading base comprises a loading base body and a telescoping device, the base body being connected to the bracket by the telescoping device.
In some embodiments of the invention, the support is further provided with a guide device for guiding the moving direction of the vertical tangential load loading base.
In some embodiments of the present invention, the horizontal load loading device is provided with a tension pressure sensor.
In some embodiments of the invention, the horizontal load loading device comprises a hydraulic transmission device, and a transmission part is arranged on the hydraulic transmission device.
The invention provides a pavement structure interlayer shear test method, which comprises the following steps of:
(1) Placing the pavement structure test piece in a fixed slot, and enabling the interface of the structural layer of the pavement structure test piece to be positioned between the vertical tangential load loading slot and the fixed slot;
(2) The horizontal load loading device applies horizontal load to the pavement structure test piece;
(3) The vertical tangential load loading device applies a vertical tangential load to the pavement structure test piece.
In some embodiments of the invention, the interface layer condition of the structural layers of the pavement structure test piece is analyzed by vertical tangential load and/or displacement of the pavement structure test piece.
In some embodiments of the invention, in the step (3), a vertical load is applied to the pavement structure specimen to generate shear failure.
The interlayer shearing test device and the interlayer shearing test method for the pavement structure can well solve the problem of testing the interlayer state of the road engineering double-layer structure, can master the interlayer mechanical property and the evolution rule of the pavement, evaluate the interlayer bonding performance of various structural combinations and estimate the attenuation condition of the shearing resistance of the existing pavement through the direct shearing test of a laboratory test piece or a field core sample, and provide a scientific test means for the design and evaluation of the pavement.
Drawings
Fig. 1 shows a side view of the invention.
Fig. 2 is a schematic perspective view of the present invention.
Description of element reference numerals
1. Support frame
2. Fixed slot
3. Vertical tangential load loading device
31. Vertical tangential load loading base
311. Base body
312. Telescopic device
32. Vertical tangential load loading slot
33. Guiding device
4. Horizontal load loading device
41. Hydraulic transmission device
42. Transmission piece
5. Tension and pressure sensor
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.
Please refer to fig. 1-2. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the invention, are not intended to be critical to the essential characteristics of the invention, but are intended to fall within the spirit and scope of the invention. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.
As shown in fig. 1-2, the invention provides an interlayer shear test device for a pavement structure, which comprises a bracket 1, wherein a fixed slot 2, a vertical tangential load loading device 3 and a horizontal load loading device 4 are arranged on the bracket 1, the vertical tangential load loading device 3 and the horizontal load loading device 4 are respectively positioned at two sides of the fixed slot 2, the vertical tangential load loading device 3 comprises a vertical tangential load loading base 31 positioned on the bracket 1 and a vertical tangential load loading slot 32 positioned on the vertical tangential load loading base, and the position of the vertical tangential load loading slot 32 is matched with the position of the fixed slot 2. The vertical tangential load loading slot 32 may be a hollow cylindrical groove with an opening facing the fixed slot 2, the diameter of the cross section of the cylinder may be 10-20cm, the height may be 3-7cm, the fixed slot 2 may be a hollow semi-cylinder, the diameter of the cross section of the fixed slot is matched with the vertical tangential load loading slot 32, and the height of the fixed slot 2 may be 10-15cm (the height direction of the slot is horizontal).
In the interlayer shear test device for the pavement structure, the vertical tangential load loading groove 32 and the fixed groove 2 are horizontally spaced, and the spacing can be 0.8-1.2cm. So that the interface of the structural layers of the pavement structure specimen can be positioned between the vertical tangential load loading slot and the fixing slot, and generally, the pavement structure specimen is preferentially fixed on the fixing slot 2. The position of the vertical tangential load loading slot 32 is generally matched with the position of the horizontal load loading device 4, and the horizontal load loading device 4 can apply a horizontal load to the pavement structure test piece, so that the horizontal load applied by the horizontal load loading device 4 is generally directed to the vertical tangential load loading slot 32.
In the pavement structure interlayer shear test device provided by the invention, the vertical tangential load loading base 31 can comprise a loading base body 311 and a telescopic device 312, wherein the base body 311 is connected with the bracket 1 through the telescopic device 312, so that the base body 311 can move vertically, the vertical tangential load loading device can apply vertical tangential load to a pavement structure test piece, the telescopic device 312 can be a spring, for example, and the elastic coefficient of the spring can be 5500-6500N/m. The support 1 may further be provided with a guide device 33 for guiding the moving direction of the vertical tangential load loading base 31, for example, the guide device 33 may include a bearing and a guide shaft, the guide shaft may be a vertical metal rod located on the support 1, and the bearing may be connected to the base body 311 and sleeved on the guide shaft, so that the moving direction of the base body 311 when moving vertically may be guided.
In the interlayer shear test device for the pavement structure, the horizontal load loading device 4 can be provided with the tension and pressure sensor 5, so that the horizontal load applied to the pavement structure test piece by the horizontal load loading device 4 can be displayed, and the accuracy of the sensor can be more than 3 per mill. The horizontal load loading device 4 may include a hydraulic transmission device 41, a transmission member 42 is disposed on the hydraulic transmission device 41, and the transmission member 42 may transmit the horizontal load applied by the hydraulic transmission device 41 to the pavement structure test piece. The hydraulic transmission device 41 may be a hydraulic cylinder, etc., and the transmission member 42 may be a metal disc, and the disc surface of the metal disc is generally attached to the pavement structure test piece.
In the interlayer shear test device for a pavement structure provided by the invention, the components such as the bracket 1, the fixed slot 2, the base body 311, the vertical tangential load loading slot 32, the transmission member 42 and the like can be generally made of high-strength materials, for example, iron alloy materials.
The pavement structure interlayer shear test method by adopting the pavement structure interlayer shear test device provided by the invention comprises the following specific processes:
(1) The testing device is arranged on the universal testing machine, so that an upper pressure head of the universal testing machine is aligned with a base body of the testing device.
(2) The pavement structure test piece is obtained by sampling an existing pavement structure drill core (or prepared by a laboratory). The pavement structure test piece is a double-layer composite test piece, the bottom of the pavement structure test piece is a circle with the diameter of 15cm, the total height of the pavement structure test piece is 10cm, and the height of each layer of structure is 5cm.
(3) And transversely arranging the test piece in a test piece slot of the test device, and preferentially filling the fixed slot so that the interface of the pavement structure test piece is positioned in the gap between the two test piece slots.
(4) And starting the hydraulic transmission device, applying horizontal load to the test piece through the metal disc, and controlling the load by means of the tension pressure sensor and the display instrument.
(5) And starting the universal testing machine, and applying a vertical tangential load to the test piece through the base body until the test piece is subjected to shearing damage.
(6) And stopping the universal testing machine, restoring the testing device to the original position by means of a spring, and taking down the test piece.
(7) And recording tangential vertical load and tangential displacement data of the test piece by a computer, and drawing a shear load-displacement curve.
(8) And analyzing the interlayer state of the pavement structure test piece through the test curve.
In summary, the present invention effectively overcomes the disadvantages of the prior art and has high industrial utility value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (9)
1. The utility model provides a road surface structure interlaminar shear test device, its characterized in that, including support (1), be equipped with fixed slot position (2), vertical tangential load loading device (3) and horizontal load loading device (4) on support (1), vertical tangential load loading device (3) and horizontal load loading device (4) are located the both sides of fixed slot position (2) respectively, vertical tangential load loading device (3) are including being located vertical tangential load loading base (31) on support (1) and being located vertical tangential load loading base vertical tangential load loading slot position (32), the position of vertical tangential load loading slot position (32) cooperatees with the position of fixed slot position (2).
2. The interlayer shear test device for a pavement structure according to claim 1, wherein the vertical tangential load loading slot (32) is spaced apart from the fixing slot (2) in a horizontal direction.
3. The pavement structure interlayer shear test device according to claim 1, wherein the vertical tangential load loading base (31) comprises a loading base body (311) and a telescopic device (312), and the base body (311) is connected with the bracket (1) through the telescopic device (312).
4. The interlayer shear test device for pavement structures according to claim 1, wherein the support (1) is further provided with a guide device (33) for guiding the moving direction of the vertical tangential load loading base (31).
5. The interlayer shear test device for a pavement structure according to claim 1, wherein the horizontal load loading device (4) is provided with a tension pressure sensor (5).
6. The interlayer shear test device for a pavement structure according to claim 1, wherein the horizontal load loading device (4) comprises a hydraulic transmission device (41), and a transmission member (42) is arranged on the hydraulic transmission device (41).
7. A pavement structure interlayer shear test method using the pavement structure interlayer shear test device according to any one of claims 1 to 6, comprising the steps of:
(1) Placing the pavement structure test piece in a fixed slot, and enabling the interface of the structural layer of the pavement structure test piece to be positioned between the vertical tangential load loading slot and the fixed slot;
(2) The horizontal load loading device applies horizontal load to the pavement structure test piece;
(3) The vertical tangential load loading device applies a vertical tangential load to the pavement structure test piece.
8. A pavement structure interlayer shear test method according to claim 7, wherein the interlayer state of the interface of the structural layers of the pavement structure test piece is analyzed by a vertical tangential load and/or a displacement occurring in the pavement structure test piece.
9. The method of claim 7, wherein in the step (3), a vertical load is applied to the pavement structure specimen to generate shear failure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611205961.1A CN106769411B (en) | 2016-12-23 | 2016-12-23 | Interlayer shear test device for pavement structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611205961.1A CN106769411B (en) | 2016-12-23 | 2016-12-23 | Interlayer shear test device for pavement structure |
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| Publication Number | Publication Date |
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| CN106769411A CN106769411A (en) | 2017-05-31 |
| CN106769411B true CN106769411B (en) | 2023-08-01 |
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| AU8053487A (en) * | 1986-10-31 | 1988-05-05 | William Ian Wood | Pavement testing machine and method of testing pavements |
| JPH10325788A (en) * | 1997-05-26 | 1998-12-08 | Fujita Corp | Apparatus and method for test of shear strength of bedrock in original position |
| CA2330431A1 (en) * | 2001-01-08 | 2002-07-08 | Stephen Norman Goodman | In situ shear strength test facility |
| CN102095682A (en) * | 2011-01-17 | 2011-06-15 | 长安大学 | Method for testing shearing strength of road structure |
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| CN104990811A (en) * | 2015-07-10 | 2015-10-21 | 山西省交通科学研究院 | A device for studying stress absorbing interlayer stress diffusion property of composite pavement |
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| JPH10325788A (en) * | 1997-05-26 | 1998-12-08 | Fujita Corp | Apparatus and method for test of shear strength of bedrock in original position |
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| CN106769411A (en) | 2017-05-31 |
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