CN104237028B - A kind of pavement structure interlayer shear strength tester - Google Patents
A kind of pavement structure interlayer shear strength tester Download PDFInfo
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- CN104237028B CN104237028B CN201410522400.9A CN201410522400A CN104237028B CN 104237028 B CN104237028 B CN 104237028B CN 201410522400 A CN201410522400 A CN 201410522400A CN 104237028 B CN104237028 B CN 104237028B
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Abstract
The invention discloses a kind of pavement structure interlayer shear strength tester, it is characterized in that arranging shearing die is that diaphragm capsule is fixed in the bottom arranged by split and top is sheared die sleeve and constituted, test specimen fixed placement is in the fixing diaphragm capsule in bottom, the shear surface of test specimen fixes the either flush of diaphragm capsule with bottom, top is sheared die sleeve and is solidly set on the shear layer of test specimen, and bottom surface is concordant with the shear surface of test specimen；The fixed angle of the fixing diaphragm capsule in bottom can regulate, so that the upper surface of test specimen is by being set as being level, or is horizontal by included angle A；Shear the side offer pulling force enforcement shearing of die sleeve on top with pull bar, the axis of pull bar is parallel with the upper surface of test specimen；Vertical loading free to rotate takes turns the upper surface utilizing the vertical pressure that vertical load bar is given to be butted on test specimen.The present invention truly simulates the road surface under certain longitudinal gradient angle, bridge floor shear property, improves measuring accuracy.
Description
Technical field
The present invention relates to a kind of pavement detection instrument, be more particularly to pavement structure interlayer shear strength tester.
Background technology
Pavement structure interlayer shear strength refers to the structure shearing resistance breakdown strength of top course interlayer, basic unit's interlayer or surface layer and basic unit's interlayer.The test of pavement structure interlayer shear strength is the important means that road pavement performance is estimated, but current conventional use of shear strength test instrument Shortcomings in following: road surface, the shear stress that bridge deck structure layer bears, especially road surface it is parallel to, the shear stress of bridge deck surfaces, mainly due to vehicle in normal traveling, cause when starting suddenly and brake, and now vehicular load still road pavement has bigger pressure at right angle, the shear resistance of structure interlayer will be produced material impact by the effect of this pressure at right angle, and this impact can along with road, the change of bridge top rake and change.Shear stress vertical road wheel load and be parallel under the load combined effect of road surface produce.Vehicle, at the Normal stress started and the load of road pavement is not only perpendicular to road surface during brake, is also parallel to the top layer passage load on road surface, and at an angle, vehicle level is 90 ° when travelling to its normal orientation with road surface.Pavement structure interlayer shear strength test instrument of the prior art is all Normal stress for the load that test specimen applies, or it is not provided with Normal stress, it is to assume that road surface is in premised on level, it is impossible to simulation road surface as shown in Figure 9, loading process when bridge floor is in different top rake.
The upper layer of test specimen is fixed by currently used pavement structure interlayer shear strength test instrument, cutting optimal slip carrying out horizontal is pulled to load, namely pull the cutting optimal on road surface or go to a grassroots level, but actually, wheel load is the upper layer directly contacting road surface, it is transmitted to lower floor by top layer perpendicular or parallel to the load on road surface, the shear stress that road surface produces is then caused by road surface centering, cutting optimal effect, obviously, existing test method is not the stressing conditions on actual road surface.
Currently used pavement structure interlayer shear strength test instrument is to utilize the vertical flat board that loads to apply Normal stress, therefore there is bigger frictional force vertical loading between flat board and road table, simulate the load being parallel to road surface according to the slip pulling road surface, ultimately result in because the existence of frictional force brings bigger error even mistake to experimental result.
Generally speaking, the structure sheaf on road surface is followed successively by upper layer, middle surface layer, cutting optimal and upper basic unit from top to bottom and goes to a grassroots level, shearing test needs to carry out between variant structure sheaf, including the shearing test etc. between the shearing test between cutting optimal and upper basic unit, upper layer and middle surface layer, but currently used pavement structure interlayer shear strength test instrument can not meet the requirement carrying out testing between different structure layer.
Summary of the invention
The present invention is for avoiding the weak point existing for above-mentioned prior art, a kind of pavement structure interlayer shear strength tester is provided, to can truly road surface when certain angle of simulated roadway or bridge and bridge floor shear property, load while taking into account the slip of road crust and vertical load, reduce because of the cancellation level of the frictional force caused by surface layer slip loading tensile and vertical load, improve simulation precision.
The present invention solves that technical problem adopts the following technical scheme that
Pavement structure interlayer shear strength tester of the present invention, it is structurally characterized in that:
Arranging shearing die is that diaphragm capsule is fixed in the bottom arranged by split and top is sheared die sleeve and constituted, test specimen fixed placement is in the fixing diaphragm capsule in described bottom, the shear surface of described test specimen fixes the either flush of diaphragm capsule with bottom, described top is sheared die sleeve and is solidly set on the shear layer of test specimen, and the bottom surface that die sleeve is sheared on top is concordant with the shear surface of test specimen；
The fixing diaphragm capsule in described bottom can regulate at the fixed angle supported on platform, so that the upper surface of described test specimen is by being set as being level, or is horizontal by included angle A；
Arranging pull bar, shear the side offer pulling force enforcement shearing of die sleeve with described pull bar on described top, the axis of described pull bar is parallel with the upper surface of described test specimen, and the rate of extension of described pull bar and pulling force can be adjusted to setting value；
Arranging and vertically load wheel, the vertical wheel that loads free to rotate is arranged on the bottom of vertical load bar, is provided with displacement transducer on described vertical load bar, and described vertical loading takes turns the upper surface utilizing the vertical pressure that vertical load bar is given to be butted on test specimen.
Pavement structure interlayer shear strength tester of the present invention, its construction features lies also in:
Arranging a lifting platform, described pull bar is to be hinged on described lifting platform with pull bar afterbody, and by the height of described lifting platform adjusting yoke afterbody, pull bar front end is fixedly connected on described top and shears the sidepiece of die sleeve.
Pavement structure interlayer shear strength tester of the present invention, its construction features also resides in:
The supporting construction arranging the fixing diaphragm capsule in described bottom is: the fixing diaphragm capsule in described bottom is propped up by support bar and stands on support platform, and the bottom of described support bar is hinged with described support platform, and the top of support bar is fixedly connected on the bottom of the fixing diaphragm capsule in bottom；The bottom of the fixing diaphragm capsule in described bottom, be in described support bar diverse location on be hinged with length-adjustable hound, the bottom of described hound is hinged on described support platform, by setting the length regulating described hound, so that the upper surface of described test specimen is in level, or it is in horizontal by included angle A.
Pavement structure interlayer shear strength tester of the present invention, its construction features also resides in:
With transverse section, the compound rut plate for rectangle is test specimen, the version arranging the fixing diaphragm capsule in described bottom is: a pair " L " shape side plate is staggered relatively and docking forms a rectangle frame at two ends, described rectangle frame is placed on a supporting plate, described supporting plate is formed with sidepiece rib in the left and right sides, with described sidepiece rib, described rectangle frame is formed spacing in the left and right sides, the base plate of fixing diaphragm capsule using described supporting plate as bottom, described support bar is be connected with described supporting plate with hound；Test specimen is positioned in the fixing diaphragm capsule in the bottom being made up of described rectangle frame and supporting plate, and it is the rectangle frame that can be solidly set on described test specimen shear layer that die sleeve is sheared on the top of supporting setting.
Pavement structure interlayer shear strength tester of the present invention, its construction features also resides in:
With transverse section for circular drill core be test specimen, arranging the fixing diaphragm capsule in described bottom is hypomere cylinder fixture, described hypomere cylinder fixture is placed on a supporting plate, described supporting plate is set to cylindrical concave station at its end face center position, described hypomere cylinder fixture is positioned in described cylindrical concave station, the base plate of fixing diaphragm capsule using described supporting plate as bottom, described support bar is be connected with described supporting plate with hound；Test specimen is positioned in the fixing diaphragm capsule in the bottom being made up of described hypomere cylinder fixture and supporting plate, and it is the epimere cylinder fixture that can be solidly set on described test specimen shear layer that die sleeve is sheared on the top of supporting setting.
Pavement structure interlayer shear strength tester of the present invention, its construction features also resides in:
Arrange the closed box of temperature-controllable, described shearing die and the vertical wheel that loads to be placed in described closed box.
Compared with the prior art, the present invention has the beneficial effect that:
1, road surface under certain longitudinal gradient angle conditions of the true simulated roadway of the present invention or bridge, bridge floor shear property, be entirely capable of meeting existing whole road, bridge Longitudinal Slope Design condition and laboratory test simulated conditions by arranging the range of grade of 0-60 °；
2, the present invention adopts the load mode pulling road surface superstructure, it is equipped with simultaneously and vertically loads wheel, load while having taken into account the slip of road crust and vertical load, closing to reality operating mode more, and significantly slackened traditional normal direction and loaded the error that the frictional force between flat board and test specimen is brought, improve simulation precision.
3, supporting different bottom solid model boxes and the top of arranging of the present invention is sheared die sleeve and is gone for the shearing of different pavement and thickness, includes compound rut plate, the i.e. square test specimen of 300mm × 300mm × 100mm, and any thickness cylinder specimen of scene drill core, φ=100mm；
4, comprehensive simulated road surface of the present invention force-bearing situation, top is set and shears die sleeve on corresponding test specimen shear layer, disclosure satisfy that the shearing test of on-the-spot drill core different-thickness and different layers position, evaluated by shearing test road pavement interlayer structure and material shear behavior.
5, according to load mode of the present invention, supporting environmental cabinet is set, and control the temperature in environmental cabinet, vertical load can be realized, be parallel to three's coupling of road surface load and temperature, this structure arranges the use environment fully meeting road surface, make shearing test road pavement interlayer structure and material can carry out Accurate Assessment, provide data more accurately for engineering practice.
Accompanying drawing explanation
Fig. 1 is present configuration schematic diagram；
Fig. 2 is test mode schematic diagram of the present invention；
Fig. 3 a is shearing die schematic front view in the present invention；
Fig. 3 b is shearing die schematic side view in the present invention；
Fig. 4 a is the fixing diaphragm capsule schematic front view in middle and lower part of the present invention；
Fig. 4 b is the fixing diaphragm capsule schematic top plan view in middle and lower part of the present invention；
Fig. 5 is that die sleeve schematic front view is sheared in middle and upper part of the present invention；
Fig. 6 is hypomere cylinder fixture schematic front view in the present invention；
Fig. 7 a is epimere cylinder fixture schematic front view in the present invention；
Fig. 7 b is epimere cylinder fixture schematic top plan view in the present invention；
Fig. 8 a is pavement structure schematic diagram；
Fig. 8 b and Fig. 8 c is the shearing die schematic diagram of different shear layers；
Fig. 9 is that automotive wheels travels mechanics principle figure on the slope；
Number in the figure: diaphragm capsule is fixed in 1 bottom, 11a is " L " shape side plate, 11b supporting plate, 11c sidepiece rib, 12a hypomere cylinder fixture, 12b cylinder concave station, 12c epimere cylinder fixture, and die sleeve is sheared on 2 tops；3 support platform, and 3a angle index, 4 pull bars, 5 vertically load wheel, 6 vertical load bars, 7 lifting platforms, 7a scale mark, 8 support bars, 9 hounds, 10 closed boxes, 11 pull bar control chambers, 12 temperature control boxs, 13 vertical Loading Control modules, 14 electric heaters.
Detailed description of the invention
In the present embodiment, between road surface structare layer, the structure of shear strength tester is set to:
As depicted in figs. 1 and 2, arranging shearing die is that diaphragm capsule 1 is fixed in the bottom arranged by split and top is sheared die sleeve 2 and constituted, test specimen fixed placement is in the fixing diaphragm capsule 1 in bottom, the shear surface of test specimen fixes the either flush of diaphragm capsule with bottom, top is sheared die sleeve and is solidly set on the shear layer of test specimen, and the bottom surface that die sleeve is sheared on top is concordant with the shear surface of test specimen；The fixing diaphragm capsule 1 in bottom can regulate at the fixed angle supported on platform 3, so that the upper surface of test specimen is by being set as being level, or is horizontal by included angle A；Arranging pull bar 4, shear the side offer pulling force enforcement shearing of die sleeve 2 with pull bar 4 on top, the axis of pull bar 4 is parallel with the upper surface of test specimen, and the rate of extension of pull bar 4 and pulling force can be adjusted to setting value；Arranging the vertical wheel 5 that loads, the free to rotate wheel 5 that vertically loads is arranged on the bottoms of vertical load bar 6, is provided with displacement transducer on vertical load bar 6, and vertical loading takes turns 5 upper surfaces utilizing the vertical pressure that vertical load bar 6 is given to be butted on test specimen.
In being embodied as, corresponding structure arranges and also includes:
As depicted in figs. 1 and 2, arranging lifting platform 7, pull bar 4 is to be hinged on lifting platform 7 with pull bar afterbody, and by the height of lifting platform 7 adjusting yoke afterbody, pull bar front end is fixedly connected on top and shears the sidepiece of die sleeve 2.
As shown in Figure 3 a and Figure 3 b shows, the supporting construction arranging the fixing diaphragm capsule 1 in bottom is: the fixing diaphragm capsule 1 in bottom stands on support platform 3 by support bar 8, the bottom of support bar 8 is hinged with support platform 3, and the top of support bar 8 is fixedly connected on the bottom of the fixing diaphragm capsule 1 in bottom；The bottom of the fixing diaphragm capsule 1 in bottom, be in support bar 8 diverse location on be hinged with length-adjustable hound 9, the bottom of hound 9 is hinged on support platform 3, by setting the length regulating hound 9, so that the upper surface of test specimen is in level, or it is in horizontal by included angle A.
As shown in figures 4 a and 4b, it is test specimen for the compound rut plate with transverse section for rectangle, the version arranging the fixing diaphragm capsule 1 in bottom is: a pair " L " shape side plate 11a is staggered relatively and docking forms a rectangle frame at two ends, rectangle frame is placed on a supporting plate 11b, supporting plate 11b is formed with sidepiece rib 11c in the left and right sides, with sidepiece rib 11c, rectangle frame is formed spacing in the left and right sides, the base plate of fixing diaphragm capsule 1 using supporting plate 11b as bottom, support bar 8 is be connected with supporting plate 11b with hound 9；Test specimen is positioned in the fixing diaphragm capsule 1 in the bottom being made up of rectangle frame and supporting plate 11b；As it is shown in figure 5, it is the rectangle frame that can be solidly set on test specimen shear layer that die sleeve 2 is sheared on the top of supporting setting.
As shown in Fig. 4 b and Fig. 6, for with transverse section for circular drill core be test specimen, the fixing diaphragm capsule 1 in bottom is set there is hypomere cylinder fixture 12a, hypomere cylinder fixture 12a is placed on supporting plate 11b, end face center position at supporting plate 11b is set to cylindrical concave station 12b, hypomere cylinder fixture 12a is positioned in cylindrical concave station 12b, and the base plate of fixing diaphragm capsule 1 using supporting plate 11b as bottom, support bar 8 is be connected with supporting plate 11b with hound 9；Test specimen is positioned in the fixing diaphragm capsule 1 in the bottom being made up of hypomere cylinder fixture 12a and supporting plate 11b；As shown in figs. 7 a and 7b, die sleeve 2 is sheared on the top of supporting setting is the epimere cylinder fixture 12c that can be solidly set on test specimen shear layer；
As it is shown in figure 1, regulate to realize temperature, closed box 10, shearing die and the vertical wheel 5 that loads are set and are placed in closed box 10.
In the pavement structure shown in Fig. 8 a, being respectively as follows: road surface 1A from end face to bottom surface successively each layer, general thickness is 40mm；Surface layer 1B in road surface, general thickness is 60mm；Road surface cutting optimal 1C, general thickness is about 80mm；Basic unit 2A on road surface, general thickness is 360mm；Go to a grassroots level 2B on road surface, is generally 200mm.
Epimere cylinder fixture and the height distribution of hypomere cylinder fixture in shearing die shown in Fig. 8 b are to be configured for shearing aspect by with road surface 1A；The height distribution of epimere cylinder fixture in shearing die shown in Fig. 8 c and hypomere cylinder fixture is to be configured by forming shearing aspect on road surface cutting optimal 1C and road surface between basic unit 2A.
Additionally, as depicted in figs. 1 and 2, in order to accurately adjust the surficial inclination of test specimen, i.e. the simulated roadway gradient, it is possible to supporting labelling angle index 3a on platform 3, and be correspondingly arranged angle indicator in the bottom of support bar 8, be used for characterizing road gradient；Meanwhile, this road gradient is demarcated correspondingly at the top of lifting platform 7 and pull bar afterbody, specifically scale mark 7a is set at the top of lifting platform 7, tuning drive gear is set at pull bar afterbody；Supporting setting can also include each control unit, and pull bar control chamber 11 as shown in Figure 1, temperature control box 12 and vertical load bar control module 13, to complete automatically to load and test process.
Coordinating adjustment support bar 8 hound 9 can obtain the road surface inclination alpha of setting, as shown in Figure 2 and Figure 9, this angle can be passed through angle index and directly read.
Vertical Loading Control module 13 adjusts the vertical loading position loading wheel 5 by vertical load bar 6, makes the vertical wheel 5 of loading connect with the upper surface of test specimen and contact；Adjusting lifting platform 7 makes pull bar 4 remain parallel with the upper surface of test specimen.
Temperature control box 12 arranges refrigeration system, by being arranged on the electric heater 14 in closed box 10, or the temperature reaching to set in closed box 10 is made by the refrigeration system being arranged in temperature control box 12, it is possible to make the temperature environment set in test specimen is tested.
The test of pavement structure interlayer shear strength is to utilize the vertical wheel that loads to implement vertical loading, pull bar and shearing die is utilized to implement to shear to test specimen, record relevant test data, including: vertical load P, surface layer rate of extension v, stretching maximal force F and maximum displacement value S, road surface interlayer section of shear A, proof box test temperature T etc..
When for different shear test block shape, vertical load, test temperature, rate of extension, pavement structure interlayer shear strength τ, adopt following formula to be calculated: τ=F/A.
Basic parameter is arranged:
The long 500mm of closed box size, wide 500mm, high 1200mm；
Temperature in closed box is arranged :-20 DEG C～60 DEG C, precision is ± 1 DEG C；
The surficial inclination of test specimen: 0～60 °；
Pull bar: loading force: 0～50KN, precision ± 0.1KN, loading speed: 10mm/min～50mm/min, precision ± 1.0mm/min；
Vertically load wheel: lifting: 0-500mm, vertical pressure: 0～50KN, precision ± 0.1KN.
Claims (5)
1. a pavement structure interlayer shear strength tester, is characterized in that:
Arranging shearing die is that diaphragm capsule (1) is fixed in the bottom arranged by split and top is sheared die sleeve (2) and constituted, test specimen fixed placement is in the fixing diaphragm capsule (1) in described bottom, the shear surface of described test specimen fixes the either flush of diaphragm capsule (1) with bottom, described top is sheared die sleeve (2) and is solidly set on the shear layer of test specimen, and the bottom surface that die sleeve (2) is sheared on top is concordant with the shear surface of test specimen；
Described bottom is fixed diaphragm capsule (1) and can be regulated at the fixed angle supported on platform (3), so that the upper surface of described test specimen is by being set as being level, or is horizontal by included angle A；
Pull bar (4) is set, the side offer pulling force enforcement shearing of die sleeve (2) is provided on described top with described pull bar (4), the axis of described pull bar (4) is parallel with the upper surface of described test specimen, and rate of extension and the pulling force of described pull bar (4) can be adjusted to setting value；
Arrange and vertically load wheel (5), the free to rotate wheel (5) that vertically loads is arranged on the bottom of vertical load bar (6), being provided with displacement transducer on described vertical load bar (6), described vertical loading takes turns the upper surface that (5) utilize the vertical pressure that vertical load bar (6) is given to be butted on test specimen；
The supporting construction arranging the fixing diaphragm capsule (1) in described bottom is: described bottom is fixed diaphragm capsule (1) and stood in support platform (3) by support bar (8), the bottom of described support bar (8) is hinged with described support platform, and the top of support bar (8) is fixedly connected on the bottom of the fixing diaphragm capsule (1) in bottom；The bottom of the fixing diaphragm capsule (1) in described bottom, be in the diverse location of described support bar (8) on be hinged with length-adjustable hound (9), the bottom of described hound (9) is hinged on described support platform (3), by setting the length regulating described hound (9), so that the upper surface of described test specimen is in level, or it is in horizontal by included angle A.
2. pavement structure interlayer shear strength tester according to claim 1, it is characterized in that: a lifting platform (7) is set, described pull bar (4) is to be hinged on described lifting platform (7) with pull bar afterbody, by the height of described lifting platform (7) adjusting yoke afterbody, pull bar front end is fixedly connected on described top and shears the sidepiece of die sleeve (2).
3. pavement structure interlayer shear strength tester according to claim 1, is characterized in that:
With transverse section, the compound rut plate for rectangle is test specimen, the version arranging the fixing diaphragm capsule (1) in described bottom is: a pair " L " shape side plate (11a) is staggered relatively and docking forms a rectangle frame at two ends, described rectangle frame is placed on a supporting plate (11b), described supporting plate (11b) is formed with sidepiece rib (11c) in the left and right sides, with described sidepiece rib (11c), described rectangle frame is formed spacing in the left and right sides, the base plate of fixing diaphragm capsule (1) using described supporting plate (11b) as bottom, described support bar (8) is be connected with described supporting plate (11b) with hound (9)；Test specimen is positioned in the fixing diaphragm capsule (1) in the bottom being made up of described rectangle frame and supporting plate, and it is the rectangle frame that can be solidly set on described test specimen shear layer that die sleeve (2) is sheared on the top of supporting setting.
4. pavement structure interlayer shear strength tester according to claim 1, is characterized in that:
With transverse section for circular drill core be test specimen, arranging the fixing diaphragm capsule (1) in described bottom is hypomere cylinder fixture (12a), described hypomere cylinder fixture (12a) is placed on a supporting plate (11b), described supporting plate (11b) is set to cylindrical concave station (12b) at its end face center position, described hypomere cylinder fixture (12a) is positioned in described cylindrical concave station (12b), the base plate of fixing diaphragm capsule using described supporting plate (11b) as bottom, described support bar (8) is be connected with described supporting plate (11b) with hound (9)；Test specimen is positioned in the fixing diaphragm capsule (1) in the bottom being made up of described hypomere cylinder fixture and supporting plate, and it is epimere cylinder fixture (12c) that can be solidly set on described test specimen shear layer that die sleeve (2) is sheared on the top of supporting setting.
5. pavement structure interlayer shear strength tester according to claim 1, is characterized in that: arranges the closed box (10) of temperature-controllable, described shearing die and the vertical wheel that loads and is placed in described closed box (10).
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| CN105445121A (en) * | 2015-01-06 | 2016-03-30 | 北京市道路工程质量监督站 | Field detection equipment for shear resistance strength of asphalt mixture |
| CN105352820B (en) * | 2015-09-18 | 2017-04-19 | 山东大学 | Multi-function fracture rock mass pressure shear test device |
| CN106442951A (en) * | 2016-10-13 | 2017-02-22 | 沈阳建筑大学 | Combined multifunctional track plate device |
| CN107764630B (en) * | 2017-10-19 | 2020-04-14 | 长安大学 | Test device for testing shear failure of asphalt pavement |
| CN107831070B (en) * | 2017-12-04 | 2024-04-09 | 长沙理工大学 | Compression shear testing device for structural strength and fatigue of composite pavement |
| CN113109175B (en) * | 2021-03-01 | 2024-06-04 | 绍兴文理学院 | Multi-angle shear strength test device for stratum boundary surface |
| CN113984546B (en) * | 2021-09-28 | 2023-08-22 | 北京建筑大学 | Testing machine and testing method for measuring road interlayer shear strength |
| CN114002079A (en) * | 2021-11-08 | 2022-02-01 | 江苏科技大学 | Large-scale interface shearing equipment and implementation method thereof |
| CN116026711B (en) * | 2023-03-30 | 2023-06-20 | 江苏腾达工程检测有限公司 | Asphalt pavement shearing fatigue degree detection equipment |
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| JP4098218B2 (en) * | 2003-11-11 | 2008-06-11 | 財団法人電力中央研究所 | Rock shear test method and rock shear test equipment |
| CN103852371B (en) * | 2014-03-12 | 2016-08-17 | 中国水电顾问集团贵阳勘测设计研究院有限公司 | Dress sample box is sheared in a kind of coarse-grained soil direct shear test visualization |
| CN104062190B (en) * | 2014-04-21 | 2017-02-22 | 青海省公路科研勘测设计院 | Shearing strength detection method for new and old pavement connecting layer material |
| CN104007025A (en) * | 2014-05-08 | 2014-08-27 | 河海大学 | Multifunctional tilt table device used for testing interfacial shear strength characteristics of geotechnical synthetic material |
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