CN108169044A - Composite recycled material road surface full scale structure antiscour experimental rig and test method - Google Patents
Composite recycled material road surface full scale structure antiscour experimental rig and test method Download PDFInfo
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- CN108169044A CN108169044A CN201711043109.3A CN201711043109A CN108169044A CN 108169044 A CN108169044 A CN 108169044A CN 201711043109 A CN201711043109 A CN 201711043109A CN 108169044 A CN108169044 A CN 108169044A
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- 239000000463 material Substances 0.000 title claims abstract description 36
- 239000002131 composite material Substances 0.000 title claims abstract description 30
- 238000010998 test method Methods 0.000 title claims description 16
- 238000012360 testing method Methods 0.000 claims abstract description 90
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims abstract description 12
- 230000003628 erosive effect Effects 0.000 claims abstract description 9
- 238000005406 washing Methods 0.000 claims description 18
- 239000004568 cement Substances 0.000 claims description 11
- 230000000087 stabilizing effect Effects 0.000 claims description 9
- 239000011384 asphalt concrete Substances 0.000 claims description 5
- 239000011230 binding agent Substances 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 4
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 4
- 230000036541 health Effects 0.000 claims description 4
- 239000004571 lime Substances 0.000 claims description 4
- 239000002689 soil Substances 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 2
- 238000003475 lamination Methods 0.000 claims 1
- 238000005057 refrigeration Methods 0.000 claims 1
- 238000002474 experimental method Methods 0.000 abstract description 17
- 230000000694 effects Effects 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 3
- 238000005086 pumping Methods 0.000 abstract description 2
- 239000010426 asphalt Substances 0.000 description 3
- 239000004567 concrete Substances 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000009991 scouring Methods 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000001680 brushing effect Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003801 milling Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000007660 shear property test Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000004154 testing of material Methods 0.000 description 1
Classifications
-
- 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
- G01N3/56—Investigating resistance to wear or abrasion
- G01N3/567—Investigating resistance to wear or abrasion by submitting the specimen to the action of a fluid or of a fluidised material, e.g. cavitation, jet abrasion
Abstract
The invention discloses a kind of composite recycled material road surface full scale structure antiscour experimental rigs, including pedestal, it is provided on the pedestal and washes away bucket for place test specimen, it is described to wash away in bucket the horizontal pressure foot for being provided with up and down reciprocatingly actuating unit driving, the horizontal pressure foot lower surface is provided with pressure sensor, the signal output end of the pressure sensor is connected with the signal input part of pressure controller, and the control output end of the pressure controller is connected with the control signal of the up and down reciprocatingly actuating unit;Also disclose the method for the test specimen of road surface full scale structure being placed on, antiscour experiment being carried out in above device, the flowing pressure and vehicle generated by simulating vehicle load sails out of the souring of the pumping power road pavement semi-rigid type base of moment generation, measure different water temperatures, flowing pressure, effect number and the relationship of base's erosion quantity, so as to analyze, compare and evaluate the erosion resistibility of semi-rigid pavement, scientific basis is provided for pavement material experiment.
Description
Technical field
The present invention relates to pavement material antierosion experiment equipment technical field, more particularly, to a kind of composite regenerated material
Expect road surface full scale structure antiscour experimental rig and test method.
Background technology
A large amount of highway condition investigations show the main reason for base material erosion resistibility deficiency is China's pavement structure damage it
One.The purt mud of such as bituminous paving, pit slot, crack, depression, the plat-bottom escape of cement concrete pavement, purt mud or even structural
Fracture etc., it is directly related with the erosion resistibility deficiency of base material.
The research of external road pavement Anti brushing Performance starts from the eighties in last century, and the U.S., France and Australia are first
The testing equipment and test method of evaluation ground surface material scour resistance are had developed afterwards, as rotating brush damages test method(s) and rotational shear
Test method(s), the evaluation index of the two is all scour rate, i.e., the ratio between the test specimen mass loss amount in given time and test specimen gross mass
The test specimen mass loss of rotation brushing test is as caused by the pressure abrasion of rotatable wire brush, and effect is washed away in rotational shear experiment
Fruit is that the shearing force of surface of test piece is caused using the flow of rotation, has very big difference with practical pressure water stream souring
It is different.
In recent years, domestic road worker improves and has developed a variety of base material washout test equipment, mainly adopts at present
With shaketalle test method and utilize MTS(Material test system)Apply the washout test method of impact force.Though both test methods
The souring of pressure water stream can be simulated, but the amount of force that is subject to of the former test specimen and frequency are unstable, and the latter is controlled by MTS
Though the impact force that pressure head processed provides is controllable, wash away that surface of test piece is subject to wash away flowing pressure be it is unknown and uneven, can not
Quantitatively judge two big parameters of pressure water stream(Flowing pressure, flow velocity)Influence to base material performance of flushing.Therefore, it is above-mentioned
Test method only rests on qualitative stage to the scour resistance evaluation of base material.In addition, MTS belongs to macrotype platform experiment dress
It puts, takes up a large area, manufacturing expense is quite high, therefore is not easy to promote.
Invention content
To solve the above-mentioned problems, the present invention provides a kind of simple in structure, easy to make, accurate composite regenerated material of control
Expect road surface full scale structure antiscour experimental rig, while provide and a kind of utilize above-mentioned experimental rig progress composite recycled material road surface
The method of full scale structure antiscour experiment.
To achieve the above object, the present invention can take following technical proposals:
Full scale structure antiscour experimental rig in composite recycled material road surface of the present invention, including pedestal, sets on the pedestal
The bucket that washes away for placing test specimen is equipped with, it is described to wash away in bucket the horizontal pressure for being provided with up and down reciprocatingly actuating unit driving
Plate, the horizontal pressure foot lower surface are provided with pressure sensor, the signal output end and pressure controller of the pressure sensor
Signal input part be connected, the control signal of the control output end of the pressure controller and the up and down reciprocatingly actuating unit
It is connected.
In order to realize automatic adjustment experiment water temperature function, refrigerator and heater, the punching are provided in the pedestal
Temperature sensor, the signal output end of the temperature sensor and the signal input part phase of temperature controller are provided in brush bucket
Even, control signal of the control output end of the temperature controller respectively with the refrigerator and heater is connected.
In order to facilitate fixed test specimen, test piece fixing device is connected on the bottom plate for washing away bucket, the test specimen is fixed
Device is the fixed frame being adapted with test specimen external dimensions.
The up and down reciprocatingly actuating unit includes being arranged on the upright bar washed away around bucket, and the upright bar passes through height adjusting part
The cylinder that air compressor machine driving is provided in the support plate washed away above bucket, the support plate is connected with, the cylinder is another
End is connected with horizontal pressure foot.Above-mentioned adjustable for height support plate can make test specimen of the experimental rig suitable for a variety of height specifications.
It is reduced in order to avoid washing away inner bucket water amount, described wash away is provided with head cover on bucket, and is offered on the head cover
Cylinder perforating.
Full scale structure antiscour test method in composite recycled material road surface of the present invention, using above-mentioned experimental rig,
Specific steps include:
The first step makes test specimen according to design requirement;
Second step, after test specimen into the water health 24 hours, taking-up is dried, and is weighed and is recorded;
Third walks, and test specimen is wrapped up with rubber sleave, and rubber sleave certain distance is exposed at the top of test specimen;Then test specimen is put into punching
Fixed in brush bucket, to water filling in bucket is washed away, the water surface is higher than test specimen top surface;
4th step sets the water temperature washed away in bucket, washes away hydraulic pressure and wash away number, starts up and down reciprocatingly actuating unit and drives level
Pressing plate pumps, and the water between horizontal pressure foot and surface of test piece is made to flow under pressure, and simulation pressure water stream is to examination
Part is washed away;
5th step, reach setting wash away number after, up and down reciprocatingly actuating unit is stopped, take out test specimen, dry, weigh simultaneously
Record calculates erosion quantity and washes away loss;
6th step carries out parallel test according to above-mentioned steps or repeats to test, and processing data obtain conclusion (of pressure testing).
The test specimen is by asphalt concrete pavement, the composite regenerated base of cement stabilizing, inorganic binder base and lime
Stablize soil underlayment to suppress.
It is offered on the test specimen from the asphalt concrete pavement and extends to the composite regenerated base of the cement stabilizing
Transverse slot.
Full scale structure antiscour experimental rig in composite recycled material road surface provided by the invention, can simulate because of vehicular load
The flowing pressure and vehicle of generation sail out of moment generation pumping power road pavement semi-rigid type base caused by souring, by
In above device antiscour is carried out to the road surface test specimen of full scale structure, particularly with crannied composite recycled material road surface test specimen
Experiment can measure different water temperatures, different flowing pressure, effect number and the relationship of base's erosion quantity, so as to analyzing, compare and
The erosion resistibility of semi-rigid pavement is evaluated, scientific basis is provided for pavement material experiment.
Compared with prior art, the present invention has the following advantages:
1)The specimen thickness of the present invention is capable of the full size thickness of simulated roadway structure completely;
2)Wide 1-3mm that the present invention is dug on shaping test piece, long 300mm, depth to the composite regenerated base bottom surface of cement stabilizing
Transverse slot, influence of the reflection crack to asphalt surface course that can be completely after simulated roadway base course crack;
3)The present invention can wash away the hydrodynamic pressure value in bucket by adjusting the pressure change of air compressor machine, while can adjust and wash away
Frequency, the temperature of flush water, so as to preferably simulate the live physical condition of bituminous paving;
4)The present invention is capable of the actual conditions of simulated roadway, and road pavement applies the uniform flowing pressure effect of continued for constant, accurately
Frequency and souring power are washed away in control, so as to examine the scour resistance of pavement material, obtain road surface under the conditions of different tests
The rule of scour resistance;
5)The device of the invention has " pump-absorb action " during experiment, i.e. water washes away and aspirates two parts, makes pull of vacuum
Effect it is more obvious;
6)Structure below at the top of test specimen of the present invention will not be washed away, and only be made in environment is washed away at the top of test specimen, with road surface
The phenomenon that truth is consistent, and improves in original test method test specimen following side by current scour, and material peels off;
7)The present invention with《Highway engineering stabilized with inorganic binder testing of materials regulation》(JTG E51-2009)The MTS of middle T0860
Or other testing equipments that can apply oscillatory load are compared, and it is small, it is easy to operate, it is economical and practical, convenient for promoting.
Description of the drawings
Fig. 1 is the structure diagram of the present invention.
Fig. 2 is the structure diagram of test specimen of the present invention.
Specific embodiment
As shown in Figure 1, full scale structure antiscour experimental rig in composite recycled material road surface of the present invention, including pedestal
1, heater 2 and refrigerator 3 can be set in pedestal, be additionally provided on pedestal 1 wash away bucket 4 and it is multiple be located at wash away it is vertical around bucket 4
Bar 5 is provided with by height adjusting part installation there are one the support plate 6 for washing away 4 top of bucket, 6 lower section of support plate is located in upright bar 5
For providing the horizontal pressure foot 9 for washing away hydraulic pressure.Specifically, 8 pedestal of cylinder and piston rod driven by air compressor machine 10 respectively with branch
Fagging 6 is connected with horizontal pressure foot 9, and cylinder 8 takes out, is vented horizontal pressure foot 9 is made to move up and down repeatedly, forces and washes away water flowing in bucket 4
Souring power is generated to test specimen, simulates practical road deck bottom wash away phenomenon.In addition, above-mentioned up and down reciprocatingly actuating unit also can be used
Other common reciprocating drive mechanisms replace.For waterproof, closed type telescopic sleeve 7 is housed in 8 outer sheath of cylinder.In order to detect
The size of scouring force, is provided with pressure sensor 11 in 9 lower surface of horizontal pressure foot, and the signal output end of pressure sensor 11 with
The signal input part of pressure controller 12 is connected, the control output end of pressure controller 12 and the control signal phase of air compressor machine 10
Even, horizontal pressure foot 9 is made to be automatically moved back and forth according to the realization of the experiment hydraulic pressure of setting;Meanwhile it can be set by pressure controller 12
Wash away number(Generally 6000 times or so), make device washing away pressure, wash away number and test test specimen according to setting.For
It avoids washing away clear water spillage in bucket and causes discharge reduction, rubber head cover is provided on bucket 4 is washed away, cylinder 8 makes across head cover
Pressing plate 9 is in below head cover.In order to facilitate fixed test specimen, test piece fixing device is provided with washing away in bucket 4.Specifically, the examination
Part fixing device is screwed onto the support post 13 for washing away 4 barrels of bottoms of bucket including multiple, and each support post 13 is with being fixed on test specimen week
The retainer ring 14 enclosed is connected.It, can be straight in bucket 4 to washing away in the case that test requirements document water temperature and ambient temperature are not much different
Connect injection room temperature clear water;Conversely, in order to realize automatic adjustment experiment water temperature function, temperature sensing can be provided with washing away in bucket 4
Device 15, and the signal output end of temperature sensor 15 is connected, and temperature is controlled with the signal input part of temperature controller 16
The control output end of device 16 and the control signal of heater 2 and refrigerator 3 are respectively connected with, make to wash away water temperature in bucket 4 according to
Test requirements document automatically adjusts.
The present invention can carry out antiscour experiment to the test specimen of multiple road structure, since the bituminous paving of semi-rigid type base leads to
Often it will appear crack, souring can be generated after moisture enters base causes road surface to generate early damage, therefore below with " table
The test specimen simulation flowing pressure that crannied composite recycled material road surface full scale structure is dug in face is firm to band crack bituminous paving half
Property base souring " for come illustrate the present invention test method.
Specifically, as shown in Fig. 2, experiment test specimen is the compound using cement stabilizing of 300mm × 300mm × 450mm
The rut test piece of Recycling Base full scale structure, underlayment 17 are the lime stabilization soil layer of 150mm, are followed successively by underlayment 17
The inorganic binder base 18 of 50mm, the composite regenerated base 19 of the cement stabilizing of 200mm(Above-mentioned composite recycled material is by practical road
Face asphalt surface course and the milling material of part base are composite regenerated after adding in a certain amount of cement and newly gathering materials to be formed)With the base of 50mm
Matter bitumen A C-13C concrete toppings 20 are opened from matrix pitch concrete topping 20 to the composite regenerated extension of base 19 of cement stabilizing
It is carved with a long 50mm, wide 3mm, the transverse slot 21 that depth is 250mm.Road surface permeable layers and sealing are not provided in test specimen.
Test procedure is as follows:
(1)By for make this experiment test specimen used in lime stabilized soil, inorganic binder, the composite regenerated milling of cement stabilizing
Material determines maximum dry density and optimum moisture content by current specifications, and by Pavement Design compactness weighing, with edge runner profiled sheeting
Formula test specimen, health finish the molding into asphalt concrete pavement, and track die trial is gradually increased to 450mm, completes specimen molding.
(2)In order to simulate the scouring effect to road surface of cracking, then a long 50mm, width 3mm, depth are opened on shaping test piece
Transverse slot for 250mm.
(3)In order to which simulated roadway is satisfied the unfavoured state of water, after test specimen into the water health 24 hours, take out, carry out outer
It sees and checks, ensure no apparent damage, dry surface moisture, weigh and record initial weight m0。
(4)Test specimen side is washed away by dynamic water in order to prevent, below the 20mm portion envelops rubber sleave 22 at the top of test specimen,
Test specimen is socketed in retainer ring later and is put into wash away in bucket and is positioned by support post, injected clear water makes to wash away bucket
In the water surface higher than test specimen top surface 20mm or so.
(5)Set wash away inner bucket water temperature as 20 DEG C, wash away that hydraulic pressure is 50KPa, to wash away number be 6000 times, start air compressor machine
Pressing plate is made to move back and forth above and below, simulates the scouring effect of pressure water stream road pavement.
(6)Test specimen is taken out, dries surface of test piece moisture, then weighing is calculated as m1, calculate erosion quantity(m0 -m1)It is damaged with washing away
Lose P,。
(7)3-5 parallel laboratory test is carried out according to above-mentioned steps, is cast out after washing away the data of loss P coefficient of variation > 15%,
Laboratory mean values are taken as final result.
Problems with should be paid attention in above-mentioned washout test:
1)During shaping test piece, each layer of mixture should all be molded by the compactness at indoor maximum dry density × scene, this
Sample can preferably simulated roadway actual state.
2)Other than test specimen is washed away loss in addition to top surface, other positions, which should not have, significantly washes away loss, the otherwise secondary examination
It is invalid to test.
3)The stability for washing away bucket and test specimen should be in test remained, if washing away bucket or test specimen loosens, Ying Li
Stop experiment, can continue after reinforcing.
4)Rubber head cover is covered with although washing away on bucket, the water washed away in bucket in experiment can also be splashed out inevitably, be
Guarantee test stability, does not influence pump-absorb action, timely moisturizing is answered in test process.
It is attached:The calibration of flowing pressure
In order to which flow is made to generate enough pressure of washing away to test specimen, the present inventor, which is investigated air compressor machine and washes away, moves hydraulic pressure in bucket
The relationship of power, it is specific as shown in table 1:
1 air compressor machine pressure of table is with washing away the flowing pressure table of comparisons in bucket
。
Claims (8)
1. a kind of composite recycled material road surface full scale structure antiscour experimental rig, it is characterised in that:Including pedestal, the pedestal
On be provided with the bucket that washes away for placing test specimen, it is described to wash away in bucket the level for being provided with up and down reciprocatingly actuating unit driving
Pressing plate, the horizontal pressure foot lower surface are provided with pressure sensor, and signal output end and the pressure of the pressure sensor control
The signal input part of device is connected, and the control output end of the pressure controller and the control of the up and down reciprocatingly actuating unit input
End is connected.
2. full scale structure antiscour experimental rig in composite recycled material road surface according to claim 1, it is characterised in that:Institute
It states and refrigerator and heater is provided in pedestal, described wash away is provided with temperature sensor in bucket, the letter of the temperature sensor
Number output terminal is connected with the signal input part of temperature controller, the control output end of the temperature controller respectively with the refrigeration
Device is connected with the control signal of heater.
3. full scale structure antiscour experimental rig in composite recycled material road surface according to claim 1, it is characterised in that:
Test piece fixing device is connected on the bottom plate for washing away bucket, the test piece fixing device is adapted with test specimen external dimensions
Fixed frame.
4. full scale structure antiscour experimental rig in composite recycled material road surface according to claim 1, it is characterised in that:Institute
It states up and down reciprocatingly actuating unit to include being arranged on the upright bar washed away around bucket, the upright bar is connected with by height adjusting part to be located at
The support plate above bucket is washed away, the cylinder of air compressor machine driving is provided in the support plate, the cylinder other end is pressed with horizontal
Plate is connected.
5. full scale structure antiscour experimental rig in composite recycled material road surface according to claim 4, it is characterised in that:Institute
It states to wash away and head cover is provided on bucket, cylinder perforating is offered on the head cover.
6. a kind of composite recycled material road surface full scale structure antiscour test method, it is characterised in that:Using described in claim 1
Experimental rig, specific steps include:
The first step makes test specimen according to design requirement;
Second step, after test specimen into the water health 24 hours, taking-up is dried, and is weighed and is recorded;
Third walks, and test specimen is wrapped up with rubber sleave, and rubber sleave certain distance is exposed at the top of test specimen;Then test specimen is put into punching
Fixed in brush bucket, to water filling in bucket is washed away, the water surface is higher than test specimen top surface;
4th step sets the water temperature washed away in bucket, washes away hydraulic pressure and wash away number, starts up and down reciprocatingly actuating unit and drives level
Pressing plate pumps, and the water between horizontal pressure foot and surface of test piece is made to flow under pressure, and simulation pressure water stream is to examination
Part is washed away;
5th step, reach setting wash away number after, up and down reciprocatingly actuating unit is stopped, take out test specimen, dry, weigh simultaneously
Record calculates erosion quantity and washes away loss;
6th step carries out parallel test according to above-mentioned steps or repeats to test, and processing data obtain conclusion (of pressure testing).
7. full scale structure antiscour test method in composite recycled material road surface according to claim 6, it is characterised in that:Institute
It is by asphalt concrete pavement, the composite regenerated base of cement stabilizing, inorganic binder base and lime stabilized soil base to state test specimen
Lamination is made.
8. the test method of full scale structure antiscour experimental rig in composite recycled material road surface according to claim 7,
It is characterized in that:It is offered on the test specimen from the asphalt concrete pavement and extends to the composite regenerated base of the cement stabilizing
Transverse slot.
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CN109490068A (en) * | 2018-12-19 | 2019-03-19 | 西北工业大学 | Work condition analogue device and the method using the unit simulation mine scouring state are washed away in mine probing |
CN109932260A (en) * | 2019-03-19 | 2019-06-25 | 北京科技大学 | A kind of the wheel tracking test system and test method of asphalt mixture hydrodynamic pressure environment |
CN110618050A (en) * | 2019-09-27 | 2019-12-27 | 长安大学 | Base material washout test device based on wheel load |
CN112113872A (en) * | 2020-09-24 | 2020-12-22 | 华北水利水电大学 | Inorganic binder stable material scouring simulation test device and detection method |
CN113109174A (en) * | 2021-03-01 | 2021-07-13 | 绍兴文理学院 | Riparian rock structural plane shear strength testing device for simulating water flow extrusion |
CN114088566A (en) * | 2021-11-17 | 2022-02-25 | 湖南省交通科学研究院有限公司 | Anti-scouring performance test system of road bed layer material |
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