CN206974834U - A kind of reinforced earth Frozen-thawed cycled drawing comprehensive test apparatus - Google Patents
A kind of reinforced earth Frozen-thawed cycled drawing comprehensive test apparatus Download PDFInfo
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- CN206974834U CN206974834U CN201720394066.2U CN201720394066U CN206974834U CN 206974834 U CN206974834 U CN 206974834U CN 201720394066 U CN201720394066 U CN 201720394066U CN 206974834 U CN206974834 U CN 206974834U
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- sideboard
- reinforced earth
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- soil
- freeze thawing
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
A kind of reinforced earth Frozen-thawed cycled drawing comprehensive test apparatus is the utility model is related to, is made up of freeze thawing part and drawing part.It can be directly used for completing the thaw collapse displacement of reinforced earth body and the observation of shear stress after open thawing and represent the measure for having related parameter of mechanical property between the muscle material soil body.The utility model instrumentation is simple, and condition is easily-controllable, visual result, accurate.
Description
Technical field
A kind of test apparatus is the utility model is related to, particularly a kind of open Frozen-thawed cycled of reinforced earth-drawing synthesis examination
Instrument is tested, the thaw collapse displacement and shear stress and measure suitable for reinforced earth body after observation thawing represent power between muscle material-soil body
That learns performance has related parameter.
Background technology
China's frost zone is about 5.14 × 106km2, account for the 53.5% of territory total area, seasonal frost region canal lining because
Canal base soil body freeze thawing deformation produces serious cold damage.It is old wheel (1996,《Dirt band》), Wang Enliang (2010,《Geotechnical engineering
Report》) research show, its frost heave of soil body reinforcement energy operative constraint, reduce horizontal frost-heaving more than 60%.Reinforcement can also weaken the soil body
Thaw settlement, Chai Yanfei (2012,《Low temperature Building technology》) research show, the thaw collapse phase laying GSZ changeover portion side slope of embankment
Safety coefficient improves 11.9%.Zhao Rongfei (2014,《Dirt band》) research show, clay embankment add grid can make its freeze thawing
Vertical displacement and maximum shear stress afterwards reduces 7% and 1.8%.
The main reason for season frozen soil generation thaw settlement is the change of shearing strength after freeze thawing, and Shear Strength Index mainly has
Cohesive strength c and internal friction angleIt can be obtained by soil body triaxial tests before and after freeze thawing.Research shows, soil body freeze-thaw stability with
The factor such as soil compaction degree, initial aqueous rate, solidification point, number of freezing and thawing and form is relevant, steady after the existing freeze thawing on the soil body
Qualitative research fails to take into full account each combined factors effect, and provides the reasonable original state of the soil body under each Freezing-Melting Condition, is effective
Soil body stability provides theoretical foundation after improving freeze thawing.
Muscle-soil contact face action characteristic directly affects reinforced earth internal stability, is reinforced earth mechanical property key index, can
Obtained by large-scale pull-out test.Domestic and international many scholars are studied muscle-soil contact face action characteristic.As a result show,
The factors such as muscle-soil contact face action characteristic and overlying load, compactness, moisture content and layer number of bar are relevant.It is existing on reinforcement
Structural mechanical property research fails to take into full account each combined factors effect, provides all kinds of optimal reinforcement forms of muscle material and the soil body, deep
Carve and disclose muscle-soil interaction rule.
Existing testing equipment mainly complete muscle material under stability and the non-Freezing-Melting Condition of reinforced earth after non-reinforced earth freeze thawing-
The measure of mechanical property between the soil body.Can be directly used for after thawing the displacement of reinforced earth body thaw collapse and the observation of shear stress and
Mechanical property has the testing equipment also imperfection of related parameter between muscle material-soil body after measure expression freeze thawing.
The open Frozen-thawed cycled of reinforced earth-drawing comprehensive test apparatus, melt available for measure freeze thawing end of a period status architecture maximum
Heavy displacement and shear stress, it is each to show that canal base melts end of a period state grid-graceful model in soil contact face Gourde(G) by large-scale pull-out test
Parameter, melt the displacement of end of a period state acquisition and soil pressure sensor data, analytical structure maximum thaw collapse displacement and shear stress each,
And carry out large-scale pull-out test and draw thawing end of a period state grid-each parameter value of the graceful model in soil contact face Gourde(G), establish above-mentioned canal
The mathematical modeling of relation between base stability parameter and major influence factors, and to shadow that canal base freeze-thaw stability is changed by each factor
Ring rule to be studied, theoretical foundation is provided for the control of seasonal frost region grid reinforcement silty clay canal base thaw settlement.
Utility model content
The purpose of this utility model is to provide a kind of open Frozen-thawed cycled of reinforced earth-drawing comprehensive test apparatus, can
The displacement of reinforced earth body thaw collapse and the observation of shear stress and measure after thawing is directly used in represent after freeze thawing between muscle material-soil body
Mechanical property has related parameter.
To achieve the above object, the utility model provides following technical scheme：
The utility model includes freeze thawing part and drawing part：
(1) freeze thawing part sets climatic chamber, in climatic chamber, sets by fixed dam, sideboard and more
Bottom hole plate shape is hinged into stuffing box, both sides sideboard by hinge and bottom plate；Geotechnique can be passed by being provided with the sideboard of both sides
The gap of grid end；In fixed dam upper weld fixed spring steel plate, permeable stone is laid on Porous Base；More bottom holes
Water tank, water tank connection water replanishing device are set below plate；Bullet is set between fixed spring steel plate on the outside of the sideboard of both sides
Spring；Crab-bolt is set on the outside of sideboard simultaneously；
(2) drawing part：In side, the outer end of sideboard, which is set, clamps the fixture of GSZ end, fixture it is another
End connects draw-off gear, and pulling force sensor and dial gauge are connected on fixture；
Before filler, permeable stone is lain in into Porous Base top；During filler, to ensure that sideboard is placed and prevented vertically
Sideboard is toppled over because soil pressure acts on, and sideboard outer surface is blocked by the crab-bolt inserted on fixed dam；By temperature
Sensor and soil pressure cell, which are embedded in reinforced earth, corresponds to test position；After filler is stable, appropriate multiple spring-compresseds are put
Between fixed spring steel plate and sideboard, horizontal displacement sensors are placed on the inside of sideboard and at spring sustained height,
Remove crab-bolt simultaneously；Load plate is placed at the top of filler, places vertical position at sideboard closer location in load plate
Displacement sensor, casting pig load is added in load plate；After stabilization to be deformed, the stuffing box equipped with filler and various accessories is put
It is overall by more than to be put into climatic chamber in water tank upper.
Freeze thawing part can carry out the soil body under each number of freezing and thawing supplying water condition under different solidification points and top pressure
Unidirectional Freezing, melt experiment, by displacement and the thaw collapse displacement of soil pressure sensor observation structure and stress distribution situation, it is determined that
Maximum thaw collapse displacement and shear stress of the structure under given experimental condition.
Drawing part will complete each model and carry out melting pull-out test under end of a period state, measure simulation grid-soil contact face
The graceful model in Gourde(G) of effect tangentially shears stiffness factor kj In each parameter：
kc、nc、Rfj、And cj(kcFor the tangential coefficient of elasticity of contact surface；ncFor the tangential elasticity indexes of contact surface；To be rubbed in contact surface
Angle, °；cjContact surface cohesive strength, kPa；RfjTo destroy ratio), acquisition represents the expression formula of mechanical property between muscle material-soil body, to add
Muscle soil body FEM calculation provides foundation.
Good effect of the present utility model：Suitable for determining freeze thawing end of a period status architecture maximum thaw collapse displacement and shear stress,
Show that canal base melts end of a period state grid-each parameter of the graceful model in soil contact face Gourde(G) by large-scale pull-out test, melt eventually each
State acquisition displacement and soil pressure sensor data, analytical structure maximum thaw collapse displacement and shear stress, and carry out large-scale drawing
Experiment, which is drawn, melts end of a period state grid-each parameter value of the graceful model in soil contact face Gourde(G), establish above-mentioned canal base stability parameter with
The mathematical modeling of relation between major influence factors, and canal base freeze-thaw stability is ground by the affecting laws that each factor changes
Study carefully, theoretical foundation is provided for the control of seasonal frost region grid reinforcement silty clay canal base thaw settlement.
Brief description of the drawings
Fig. 1 is open Frozen-thawed cycled-drawing comprehensive test apparatus structural representation (top office is cutd open).
Fig. 2 is Fig. 1 left view.
Fig. 3 is Fig. 1 top view.
Fig. 4 is open Frozen-thawed cycled-drawing comprehensive test apparatus operation principle schematic diagram (parallel drawing direction).
Fig. 5 is Fig. 4 left view.
Component serial number in accompanying drawing：Fixed spring steel plate 1, spring 2, crab-bolt 3, load 4, load plate 5, fixed gear 6 are living
Dynamic baffle plate 7, gap 7-1, hinge 8, permeable stone 9, bottom plate 10, water tank 11, water replanishing device 12, climatic chamber 13, vertical displacement
Sensor 14 (existing KTM-100mm types linear displacement transducer, maximum displacement of the lines 100mm, precision 0.5%), horizontal displacement
Sensor 15 (existing KTM-200mm types linear displacement transducer, maximum displacement of the lines 200mm, precision 0.5%), fixture 16, draw
Force snesor 17 (existing TJL-1S types pulling force sensor, 0.05~200kN of rated load, -20 DEG C of operating temperature~65 DEG C),
Dial gauge 18 (existing WBD-50 percentages tabular form resistance-strain displacement transducer, -45 DEG C of minimum operating temperature), temperature sensor
19 (existing DM-301 types temperature sensor, operating temperatures：- 50 DEG C~200 DEG C, (the existing JDY-110 types of soil pressure cell 20
Monofilm soil pressure cell, temperature range：- 30 DEG C~80 DEG C, range：1.5MPa)；(the water of existing controllable-rate of draw-off gear 21
Horizontal drawing pulls out testing machine, and its drawing speed range is 0.07~8.67mm/min, it is possible to provide draft be 3t), silty glues
Soil 22；GSZ 23 (existing TGSG30-30 types biaxial tension Plastics Geogrids).
Embodiment
The utility model includes freeze thawing part and drawing part：
(1) freeze thawing part
See Fig. 1-3, in climatic chamber 13, set and formed and filled out by fixed dam 6, sideboard 7 and Porous Base 10
Hopper, wherein, two pieces of fixed dams 6 are welded in bottom plate 10, and two pieces of sideboards 7 are placed in the top of bottom plate 10, pass through hinge 8 and bottom
Plate 10 is be hinged.Sideboard 7 opens up breach 7-1；Fixed spring steel plate 1 is welded in the top of the fixed dam 6 (upper surface of filler
Position).Permeable stone 9 is laid on bottom plate 10；Water tank 11 is set below bottom plate 10, and water tank 11 connects water supply tank 12.In perseverance
Both sides fixed spring steel plate 1 in constant temperature and humidity case 13, in level side between the outside of sideboard 7 of both sides and fixed spring steel plate 1
To equidistantly fixing 5 springs；Crab-bolt 3 is set in the outside of sideboard 7 simultaneously.Before freeze thawing, fixed dam top crab-bolt is unclamped
3, ensure that there is identical to go along with sb. to guard him effect for spring constraint and original crab-bolt 3 at this.Frozen-thaw process, freeze, thawing effect causes canal
Based structures stress along its length and deformation will be reflected by camber of spring.
(2) drawing part
See Fig. 2-5, the outer end of sideboard 7 sets the fixture 16 for clamping the end of GSZ 23 in side, fixture 16
The other end connects draw-off gear 21 (for existing apparatus), and pulling force sensor 17 and dial gauge 18 are connected on fixture 16.
Before filler, permeable stone 9 is lain in into the top of Porous Base 10.During filler, to ensure that sideboard 7 is placed vertically,
The outer surface of sideboard 7 is stuck in by the crab-bolt 3 inserted positioned at the bottom of fixed spring steel plate 1 in fixed dam 6, prevents active catch
Plate 7 is toppled over because soil pressure acts on；Temperature sensor 19 and soil pressure cell 20 are embedded in reinforced earth and correspond to test position.Fill out
After material is stable, horizontal equidistant multiple springs 2 are placed between fixed spring steel plate 1 and sideboard 7 and (frozen-thaw process, freezes, melt
Change effect causes canal based structures stress along its length and deformation to reflect by camber of spring.), by horizontal displacement sensors
15 are placed on the inside of sideboard and at the sustained height of spring 2, while remove crab-bolt 3；Load plate 5 is placed at the top of filler, is being added
Vertical displacement sensor 14 is placed on support plate 5 at the closer location of sideboard 7, casting pig load 4 is added to load plate 5
On.After stabilization to be deformed, the stuffing box equipped with filler and various accessories is placed on the top of water tank 11, water tank 11 and the phase of water supply tank 12
Connection, when ensureing filler frost heave, moisture can be absorbed from water tank.When filling sample, breach 7- of each layer grid from sideboard 7 is only allowed
1 passes, and it is smaller to ensure that grid rubs with breach contact surface, to ensure that drawing process grid and breach are noiseless, it is ensured that drawing
Test the accuracy of each parametric measurement.
The overall climatic chamber 13 that is put into (uses existing TX-THS-1500 types double door constant temperature and moisture test by more than
Case) in.
Test method：
(1) freezing-thawing test
Freezing and thawing test mainly comprises the following steps：Dress sample → loading → constant temperature protects load → Unidirectional Freezing (multiple) → is unidirectionally melted
Change (multiple) → data acquisition.Fill sample process：The backfill earth material pressing solidity K={ m/ [V (1+W) of different initial aqueous rates
ρdmax] × 100% (m is prepares soil property amount, g needed for the packing layer of corresponding compactness；W is filler initial aqueous rate, %；V is
Packing layer volume, cm3；ρdmaxFor the unit weight of water at 4 DEG C, g/cm3.) uniformly lay, and manually hit reality；Loading procedure：Fill sample knot
Shu Hou, stacking casting pig load 4 from inside to outside in load plate central area makes canal base reach base pressure on top surface needed for experiment；Constant temperature is protected
Load process：After loading terminates, regulating thermostatic constant humidity cabinet is to+1 DEG C, and constant temperature protects load 24h before freeze thawing, it is ensured that and temperature is uniform in soil sample,
Consolidation is preferable, and keeps the load until freeze thawing terminates, for ensure test specimen in climatic chamber Unidirectional Freezing, melt, it is necessary to
Insulation processing is carried out to test specimen, i.e., put on to all testpieces in climatic chamber compound by nanoporous aerogel felt and benzene plate
" insulation clothes " (existing product) that material makes, only expose test specimen freeze thawing face.Unidirectional Freezing process：Regulating thermostatic constant humidity cabinet
Up to solidification point needed for experiment, keep stable, test specimen different soil temperature is monitored by temperature and displacement transducer and the soil body is whole
Body deforms, and after each soil temperature and frost-heaving deformation tend towards stability, stops freezing, temperature, displacement and soil pressure sensor pass through
Wire is connected with the DH3820 type high speed static strain testing analysis systems of outside, and uses computer-automatic collection data；It is single
To melting process：After freezing end, the temperature inside the box is adjusted into+15 DEG C of heating and meltings, and (research shows that forced thaw is to melting soil pressure contracting
Total amount is deformed without influence, it is only to speed up and completes speed), equally monitor temperature at test specimen different depth and become with soil body entirety thaw collapse
Shape, after thaw collapse is stable, stop melting；Data acquisition：Thawing terminates, and immediately passes through displacement and soil pressure sensor detection examination
Part deforms and stressing conditions.Water charging system ensures that current are unobstructed to prevent the soil body from being extruded from Porous Base, can be in test specimen bottom
Permeable stone is set between bottom plate, meanwhile, it need to ensure freezing process water charging system water temperature more than 0 DEG C.
(2) pull-out test
For the difference of grid-soil contact face action characteristic after freeze thawing under the conditions of reflection different reinforcement, correlometer is accurately obtained
Parameter is calculated, in drawing direction baffle plate different parts height can be set (to consider for 30mm because top is banketed deadweight, vertical loading and jelly
Melting deformation makes each layer grid produce vertical displacement, causes the interference effect of grid and baffle plate breach, influences the accurate of pull-out test
Property), wide 550mm breach 7-1 (grid width is 500mm), each layer pull-out test carry out from top to bottom.Horizontal addload is by existing
Pull-out test machine carry out, allow during drawing fixture to be close to drawing terminal block plate surface, grid stretch out baffle plate both ends be respectively 30mm and
70mm is (see Fig. 4, to ensure that drawing whole process grid-soil contact face area is constant.Pulling force is set to pass between testing machine and grid drawing end
Sensor, to measure horizontal pull, horizontal displacement is measured by the resistance-type dial gauge that range is 50mm, pulling force sensor and electricity
Resistive dial gauge is connected by wire with the DH3820 type high speed static strain testing analysis systems of outside, and uses computer
Automatic data collection.After freeze thawing terminates, i.e., test specimen is integrally removed out of climatic chamber, tune-up data is shown and collection is set
It is standby, horizontal direction draw-off gear is started, it is 1.0mm/min to control drawing speed, and after peak value occurs in pulling capacity, it is straight to continue drawing
It is stable to pulling capacity, that is, stop experiment.By analyzing shear stress and horizontal displacement and vertical stress relation curve, simulation lattice are obtained
Each parameter of the graceful model in Gourde(G) of grid-soil contact face effect：kc、nc、Rfj、And cj。
Claims (1)
1. a kind of reinforced earth Frozen-thawed cycled-drawing comprehensive test apparatus, it is characterized in that：Including freeze thawing part and drawing part：
The freeze thawing part sets climatic chamber, in climatic chamber, sets by fixed dam, sideboard and more bottom holes
Plate shape is hinged into stuffing box, both sides sideboard by hinge and bottom plate；GSZ can be passed by being provided with the sideboard of both sides
The gap of end；In fixed dam upper weld fixed spring steel plate, permeable stone is laid on Porous Base；Porous Base
Water tank, water tank connection water replanishing device is provided below；Spring is set between fixed spring steel plate on the outside of the sideboard of both sides；Together
When crab-bolt is set on the outside of sideboard；
The drawing part：In side, the outer end of sideboard sets the fixture for clamping GSZ end, the other end of fixture
Draw-off gear is connected, pulling force sensor and dial gauge are connected on fixture.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720394066.2U CN206974834U (en) | 2017-04-15 | 2017-04-15 | A kind of reinforced earth Frozen-thawed cycled drawing comprehensive test apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720394066.2U CN206974834U (en) | 2017-04-15 | 2017-04-15 | A kind of reinforced earth Frozen-thawed cycled drawing comprehensive test apparatus |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109211676A (en) * | 2018-09-21 | 2019-01-15 | 三峡大学 | Measure the device and analogy method of Rock And Soil stress repletion transfer law |
| CN112577833A (en) * | 2020-12-29 | 2021-03-30 | 哈尔滨工业大学 | Multilayer reinforced soil drawing tester suitable for coarse-grained filler of cold region roadbed |
| CN115538404A (en) * | 2022-12-01 | 2022-12-30 | 中国科学院、水利部成都山地灾害与环境研究所 | Dynamic circulation load lower pile net structure load sharing test device and test method thereof |
-
2017
- 2017-04-15 CN CN201720394066.2U patent/CN206974834U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109211676A (en) * | 2018-09-21 | 2019-01-15 | 三峡大学 | Measure the device and analogy method of Rock And Soil stress repletion transfer law |
| CN112577833A (en) * | 2020-12-29 | 2021-03-30 | 哈尔滨工业大学 | Multilayer reinforced soil drawing tester suitable for coarse-grained filler of cold region roadbed |
| CN115538404A (en) * | 2022-12-01 | 2022-12-30 | 中国科学院、水利部成都山地灾害与环境研究所 | Dynamic circulation load lower pile net structure load sharing test device and test method thereof |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20180206 Termination date: 20200415 |