CN108918290A - The test soil body is uniaxially stretched the device and method of rheological behavior - Google Patents
The test soil body is uniaxially stretched the device and method of rheological behavior Download PDFInfo
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- CN108918290A CN108918290A CN201811035720.6A CN201811035720A CN108918290A CN 108918290 A CN108918290 A CN 108918290A CN 201811035720 A CN201811035720 A CN 201811035720A CN 108918290 A CN108918290 A CN 108918290A
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- 239000002689 soil Substances 0.000 title claims abstract description 73
- 238000012360 testing method Methods 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000007667 floating Methods 0.000 claims abstract description 55
- 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 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000000523 sample Substances 0.000 claims description 129
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000009413 insulation Methods 0.000 claims description 5
- 240000004282 Grewia occidentalis Species 0.000 claims description 3
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- 239000007787 solid Substances 0.000 claims description 2
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- 238000012545 processing Methods 0.000 description 7
- 238000006073 displacement reaction Methods 0.000 description 6
- 238000007873 sieving Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
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- 238000002474 experimental method Methods 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
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- 229920006255 plastic film Polymers 0.000 description 2
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Classifications
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/14—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by dead weight, e.g. pendulum; generated by springs tension
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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
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0033—Weight
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
- G01N2203/0647—Image analysis
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
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Abstract
The invention discloses the devices that a kind of test soil body is uniaxially stretched rheological behavior, including testing stand and the pedestal being set on testing stand, two sides are respectively arranged with the stationary fixture and floating holder being fixedly connected with the sample both ends in cylinder to the pedestal along its length, floating holder and driving unit cooperate, and driving unit can drive floating holder to move along pedestal length direction；The water conservation unit for preventing sample moisture content from losing and the control temperature unit for keeping specimen temperature can be sealed by also having on the outside of pedestal；The pedestal can adjust levelness relative to testing stand.The invention also discloses the methods for using the device to test draft flowing deformation characteristic.The advantages of device and method of test soil body draft flowing deformation characteristic provided by the invention, is：Sample end fixing intensity is good, and moisture content, temperature are kept constant in experimentation, convenient for control experimental variable；Image is obtained by video camera and carries out strain measurement, and data are accurate, can obtain more true result.
Description
Technical field
The present invention relates to the soil bodys to be uniaxially stretched rheological behavior the field of test technology, more particularly to the test soil body is uniaxially stretched stream
Become the device and method of characteristic.
Background technique
The soil body is in pressured state in most cases, and native destruction is also based on internal shear caused by by pressure.So
Test about soil focuses primarily upon shearing-resistance characteristic and compression property research.Tensile test research about soil is less, does not have so far
There are unified test specification and experimental rig.In practical geotechnical engineering field, soil body tensile failure is implicitly present in, such as sliding
Disaster slight slope top before generation in slope often generates vertical drawing crack in advance and stitches, and under long duration of action, drawing crack seam gradually prolongs to deep
Internal slide face is extended to, the generation on landslide is accelerated；It is generated horizontal inside certain earth and rockfill dams due to the differential settlement of native stone
Drawing crack is stitched, and under long duration of action, drawing crack seam, which is constantly opened, to be split, and is induced and is permeated even hydraulic fracture disaster.Therefore, these drawing cracks are stitched
Generation and expansion is the combined influence of tensile stress and time effect.
In recent years, increasingly by the concern of Chinese and overseas scholars, various stretching devices are developed soil body tensile characteristics,
Test aspect mainly has studied the influence factor of the tensile characteristics of soil, including dry density, and moisture content, loading speed is (for strain
Formula single shaft instrument) etc..In addition the theoretical model of several prediction soil body tensile strength is proposed.But it is special about the tensile creep of soil
Property be but rarely reported, i.e., there is no influence of the time effect to tensile characteristics for considering load in experiment.
In addition temperature is to influence an important factor for Ground crack can not be ignored, and temperature field is to soil body mechanical characteristic (tension)
It influences to be also Studying Urbanization heat island phenomenon, thermal energy storage, the important topic of nuclear waste storage.Therefore, recognize and study the soil body
Draft flowing deformation characteristic, influence including temperature to draft flowing deformation has certain guidance to soil mechanics test and theoretical development
Meaning.
If studying soil body draft flowing deformation characteristic, existing stress-type uniaxial tensile test device is primarily present following several
A problem：
(1) the development difficult point of Stress Control formula device is concentrated mainly on how sample end is fixed and connected, bottom friction
Power influences and eccentric force influences.It is especially the most prominent with the connectivity problem of end in these three problems, sample end is connected at present
The shape of fixture head is fixed, and can be installed to sample and be brought difficulty, sample end is be easy to cause just to occur before the test
Damage.Some end fixtures are also sample compaction tool simultaneously, and the soil particle omitted outside fixture in sample compacting process can be dirty
Instrument is contaminated, real sample is in addition hit on instrument, the measuring accuracy of stretching device certainly will be influenced.Furthermore the design of variable cross-section fixture
Original intention is to avoid sample end in fixture internal break, but often concentrate due to stress and sample is caused to break at the alternation of cross-section
It splits, rather than occurs in effective length range.This will will affect the accuracy of tensile strength values.
(2) soil body uniaxial tension test at present is mainly used to survey tensile strength, and sample all exposes in air, short substantially
The lower loss that approximate can ignore moisture content of time test.Ground crack test period is relatively long, and moisture content is to influence to resist again
An important factor for drawing characteristic, so research rheological behavior would have to consider good Water-retaining Measure.
(3) temperature is an important factor for influencing rheology characteristics of soil, and in general temperature is bigger, and rheological effect is more obvious.
(4) measurement of stretching displacement is most using the displacement meter or displacement sensor that connect with fixture.Instrument processing
The influence factors such as precision difference, displacement meter and sensor installation accuracy, which all may cause test result, certain error.
Summary of the invention
Technical problem to be solved by the present invention lies in provide one kind to prevent sample moisture content from losing and be able to maintain
The test soil sample of specimen temperature is uniaxially stretched the device and test method of rheological behavior.
The present invention is to solve above-mentioned technical problem by the following technical programs：
A kind of test soil body is uniaxially stretched the device of rheological behavior, including testing stand and the pedestal being set on testing stand,
Two sides are respectively arranged with the stationary fixture being fixedly connected with the sample both ends in cylinder to the pedestal along its length and activity is pressed from both sides
Tool, floating holder and driving unit cooperate, and driving unit can drive floating holder to move along pedestal length direction；On the outside of pedestal
The water conservation unit for preventing sample moisture content from losing and the control temperature unit for keeping specimen temperature can be sealed by also having；The pedestal energy
It is enough to adjust levelness relative to testing stand.
Preferably, the stationary fixture and floating holder are at least open cavity body structure of opposite face.
Preferably, a leveling bolt, the pedestal quadrangle difference are respectively fixed in pedestal quadrangle on the testing stand
Across leveling bolt；The leveling bolt is respectively arranged with a nut in pedestal upper and lower surface.
Preferably, the driving unit includes the pulley being fixed on pedestal and the traction with floating holder secure fit
Rope, the pulley and stationary fixture and floating holder are on same straight line and are in one of floating holder far from stationary fixture
Side；Traction rope end is fixed with the Support tray for placing weight, the traction rope and floating holder far from stationary fixture one
Side is fixedly connected and in the horizontal direction around pulley, hangs Support tray along the vertical direction.
Preferably, the water conservation unit is the cuboid cavity being fastened on pedestal, the stationary fixture and floating holder
It is in inside water conservation unit；Floating holder being capable of the free movement inside water conservation unit；The water conservation unit at least top is
Dismountable transparent baffle, water conservation unit have the first through hole passed through for traction rope close to one end of pulley.
Preferably, the control temperature unit includes being vertically arranged at closed rectangular enclosing on the outside of water conservation unit and dismountable
It is fixed on the transparent enclosing of the rectangle side of blocking；It is fixed with insulation board on the outside of rectangle enclosing, inside is provided with infrared ray heating tube
And temperature-sensing probe, rectangle enclosing have the second through-hole passed through for traction rope close to the side of pulley.
Preferably, the insulation board is the insulation foam plate pasted on the outside of rectangle enclosing.
Preferably, also there is the track moved for floating holder, the track length direction and pedestal are long on the pedestal
It is parallel to spend direction.
Preferably, spirit level is additionally provided on the pedestal.
The present invention also provides the device to test soil bodys for using the test soil body to be uniaxially stretched rheological behavior to be uniaxially stretched
The method of rheological behavior, includes the following steps：
Step a：Sample is installed, the transparent enclosing of control temperature unit and the transparent baffle of water conservation unit are removed, in stationary fixture
Binder is smeared respectively with the inside of floating holder, the prefabricated cylindricality sample with certain temperature is horizontally arranged, sample two
It holds the inner adhesion respectively with stationary fixture and floating holder to fix, then retightens transparent baffle and transparent enclosing, and will
Control temperature unit powers on；
Step b：Leveling adjusts the nut on pedestal four-corner leveling bolt, keeps spirit level display horizontal；
Step c：Image is obtained, the camera of face sample is fixed above pedestal, camera is for obtaining specimen surface image；
Step d：Apply stress, counterweight is put on Support tray, each weight keeps certain creep time, and passes through camera
Sample Image at this time is obtained, increases load step by step, until sample fracture；
Step e：Data are obtained, is handled by applying the image obtained after specific time to every grade of stress, obtains examination
The draft flowing deformation characteristic of sample at a certain temperature is obtained by calculation in the strain variation situation on sample surface.
Preferably, in step a, the end face and side of stationary fixture and floating holder are provided with sheet rubber, the sample
Both ends of the surface and the side Chong Die with stationary fixture and floating holder are bonded with the sheet rubber in stationary fixture and floating holder respectively
It is fixed.
Preferably, the method that sample strain is obtained in step e is the image obtained using DIC technical treatment, the strain
Refer to the deformation of sample effective length part, the effective length refers to that the sample between stationary fixture and floating holder is long
Degree.
Preferably, further include the steps that calculating sample Poisson's ratio υ,
Wherein, e1For transverse strain in sample effective length, e0For axial strain in sample effective length.
Preferably, the sample is rectangular parallelepiped structure.
The present invention also provides a kind of soil body single shaft preparation method of sample for test, include the following steps：
Step 1：Sorting fetches the original state soil body from region to be tested；
Step 2：It pulverizes air-dried, undisturbed soil is pulverized and air-dried；
Step 3：Sieving, to step 2, treated that dry soil sample is screened, and the soil sample of sieving is retained；
Step 4：Moisture content is configured, weighs sieving soil sample and water respectively in proportion, and mix in container, sealing and standing；
Step 5：Beat numbers stir evenly the remoulded sample that step 4 prepares moisture content, are added in mold several times
It carries out hitting reality；
Step 6：Heating, molding soil sample is removed from the molds, is heated to assigned temperature after carrying out water conservation processing.
Preferably, the mesh size that step 3 uses is 2mm.
Preferably, soil sample water content w described in step 4 is the ratio of water weight and soil sample weight；Soil sample and water are divided equally
It is more parts, is added in container is mixed several times.
Preferably, mold described in step 5 has columnar formations chamber, and soil sample is inserted in mold hit along its length
Real molding.
Preferably, the forming cavity of the mold is rectangular parallelepiped structure.
Preferably, the joint face of each layer of step 5 is hit after reality soil sample and next layer of soil sample carries out plane hair processing, adds
Before entering remoulded sample, mould inner wall is coated with lubricating oil.
Preferably, then the processing of water conservation described in step 6 wraps up in sample with paper bag, and make for wrapping up sample with plastic film
With rubber belt sealing sample.
Preferably, heating means described in step 6 are that sample is put into the heating vessel containing sand after handling water conservation
In, and sample is buried with sand, vessel are put into heater box and are heated.
Preferably, the vessel are metalware, and sand uses Extra-fine sand；It is heated 8-10 hours in heater box.
The advantages of test soil body provided by the invention is uniaxially stretched the device and method of rheological behavior is：Sample end is solid
It is good to determine intensity, moisture content is kept constant in experimentation, can carry out different temperatures sample testing, and instrumentation is simple, convenient for control
Experimental variable processed；Image is obtained by video camera and carries out DIC strain analysis, and data are accurate, can obtain more true result.
Detailed description of the invention
Fig. 1 is the main view for the device that the test soil body is uniaxially stretched rheological behavior provided by the embodiment of the present invention；
The test soil body provided by Fig. 2 the embodiment of the present invention is uniaxially stretched the top view of the device of rheological behavior.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in further detail.
A kind of test soil body is uniaxially stretched the device of rheological behavior combined with Figure 1 and Figure 2, including testing stand 1 and is set to examination
The pedestal 2 on platform 1 is tested, two sides are respectively arranged with and the sample (not shown) two in column structure the pedestal 2 along its length
The stationary fixture 3 and floating holder 4 being fixedly connected are held, floating holder 4 and a driving unit 5 cooperate, and driving unit 5 can drive
Floating holder 4 is moved along 2 length direction of pedestal；2 outside of pedestal, which also has that stationary fixture 3 and floating holder 4 can be sealed, prevents
The only control temperature unit (not shown) of the water conservation unit (not shown) of sample moisture content loss and holding specimen temperature, the pedestal 2
Levelness can be changed relative to testing stand 1 to ensure sample level.
When in use, sample is horizontally fixed on stationary fixture 3 and floating holder 4, adjusts pedestal 2 relative to testing stand
1 position makes sample abswolute level, the influence to avoid gravity to sample.Pulling force is provided to floating holder 4 by driving unit 5
Make sample deformation until fracture, record sample stress and strain variation can analyze sample draft flowing deformation characteristic, the strain refers to
Be sample effective length part deformation, the effective length refers to that the sample between stationary fixture and floating holder is long
Degree.
The stationary fixture 3 and floating holder 4 are at least open cavity body structure of opposite face, to easily fix sample end
Portion is easily installed sample.
The leveling bolt being vertically arranged 11, the pedestal 2 are respectively fixed on the testing stand 1 at 2 four jiaos of pedestal
Quadrangle is each passed through adjustment bolt 11, and leveling bolt 11 is respectively arranged with a nut 12 in 2 upper and lower surface of pedestal.It can pass through
Change the position of nut 12 along leveling bolt 11 so as to adjust the levelness of pedestal 2.
The driving unit 5 includes the pulley 51 being fixed on pedestal 2 and the traction rope with 4 secure fit of floating holder
52, the pulley 51 is on same straight line with stationary fixture 3 and floating holder 4, and stationary fixture 2 and pulley 51 are placed in activity
4 two sides of fixture, 52 end of traction rope are fixed with the Support tray 53 for placing weight, and the traction rope 52 is remote with floating holder 4
Side from stationary fixture 3 is fixedly connected and in the horizontal direction around pulley 51, hangs Support tray 53 along the vertical direction.In support
When placing weight in disk 53, floating holder 4 can be driven to move along the length direction of pedestal 2 far from stationary fixture 3.
The water conservation unit is the cuboid cavity (not shown) being fastened on pedestal, the stationary fixture 3 and activity folder
Tool 4 is in inside water conservation unit；Floating holder 4 being capable of the free movement inside water conservation unit；The water conservation unit at least on
Side is dismountable transparent baffle (not shown), and water conservation unit has first passed through for traction rope 52 close to one end of pulley 51
Through-hole (not shown).
The control temperature unit includes the closed rectangular enclosing 61 being vertically arranged on the outside of water conservation unit and removably fixes
Transparent enclosing (not shown) above rectangle enclosing 61；Insulation board (not shown) is fixed on the outside of rectangle enclosing 61, inside is set
It is equipped with infrared ray heating tube (not shown) and temperature-sensing probe (not shown), rectangle enclosing 61 has close to the side of pulley for traction
The second through-hole (not shown) that rope 52 passes through.The insulation board is specially the insulation foam plate pasted in 61 outside of rectangle enclosing.
The water conservation unit and control temperature unit are respectively used to prevent from being fixed on the sample on stationary fixture 3 and floating holder 4
Temperature locating for sample is constant during moisture content loss and guarantee test, so as to carry out respectively to sample for different temperatures
Test, to obtain influence of the temperature to sample draft flowing deformation characteristic.On the basis of the stretching device that the present invention has disclosed, protect
The prior art can be used in water unit and control temperature unit and common knowledge is realized, the application repeats no more.
The track 21 moved for floating holder 4, the length direction and pedestal of the track 21 are additionally provided on the pedestal 2
2 length direction is parallel；Track 21 described in preferred embodiment includes strip groove (not shown) and the arrangement being fixed on pedestal 2
Ball (not shown) in strip groove, so that floating holder 4 and ball relative rolling be made to carry out relative motion；In order to guarantee to live
Dynamic fixture 4 can be moved along strip groove length direction, and the notch that can be set below floating holder 4 in strip groove cooperation (is schemed not
Show), naturally it is also possible to limit is carried out to floating holder 4 by water conservation unit and realizes same purpose.
At least one spirit level (not shown) is further fixed on the pedestal 2, convenient for passing through observation spirit level in leveling
Bubble position determine whether pedestal horizontal.The spirit level is preferably Universal level-metre.
The present invention also provides the method for using the above-mentioned stretching device test soil body to be uniaxially stretched rheological behavior, including it is following
Step：
Step a：Sample is installed, the transparent enclosing of control temperature unit and the transparent baffle of water conservation unit are removed, in stationary fixture 3
Smear binder respectively with the inside of floating holder 4, cylindricality sample be horizontally arranged, sample both ends respectively with stationary fixture and work
The inner adhesion of dynamic fixture is fixed, and is then retightened transparent baffle and transparent enclosing, and control temperature unit is powered on, is made to try
Sample keeps constant temperature；
The sample both ends of the surface and the side Chong Die with stationary fixture 3 and floating holder 4 respectively with stationary fixture 3 and activity
The bonding cooperation of fixture 4, to improve adhesion strength, the sample both ends being bonding at this time are thought to occur when being stretched
Deformation mainly considers in test the strain variation of the sample effective length among stationary fixture 3 and floating holder 4；
The sample is preferably rectangular parallelepiped structure or cylindrical structure, can be avoided stress collection when using cylindrical structure
In, it is convenient for subsequent measurement specimen surface lateral displacement to change using when rectangular parallelepiped structure.
Step b：Leveling adjusts the nut on pedestal four-corner leveling bolt, keeps spirit level display horizontal.
Step c：Image is obtained, the camera of face sample is fixed above pedestal, for obtaining the image of sample.
Step d：Apply stress, counterweight is put on Support tray, each weight keeps certain creep time, and passes through camera
The image for obtaining sample at this time, increases load, until sample fracture step by step.
Step e：Data are obtained, by measuring to the image after every grade of stress application specific time, obtain sample
The draft flowing deformation characteristic of sample at a certain temperature is obtained by calculation in strain variation situation.
The draft flowing deformation characteristic is the relationship of strain, stress and the time of sample effective length, temperature etc., the stress
It is all provided by the gravity of counterweight, and digital image correlation technique (DIC) displacement strain is carried out by MATLAB or similar software
Analysis.
In addition, the method for test draft flowing deformation characteristic provided by the present application can be used for obtaining the Poisson's ratio υ that sample stretches,
Wherein, e1For transverse strain in sample effective length, e0For axial strain in sample effective length.
The test device and test method provided through the invention, improves the bonding strength of sample end, in an experiment
It can ensure sample water content and temperature-resistant, thus the drawing of the soil body single shaft sample under the conditions of obtaining different water cut and temperature
Stretch the data such as rheological behavior and Poisson's ratio.
The invention also discloses a kind of for testing the preparation method of the soil body sample of draft flowing deformation characteristic, including following step
Suddenly：
Step 1：Sorting fetches the original state soil body from region to be tested；
Step 2：It pulverizes air-dried, undisturbed soil is pulverized and air-dried；
Step 3：Sieving, using aperture 2mm sieve, to step 2, treated that dry soil sample is screened, by sieving
Soil sample retains；
Step 4：Moisture content is configured, weighs sieving soil sample and water respectively in proportion, and mix in container, sealing and standing；
Wherein water content w is the ratio of water weight and soil sample weight.It is in order to ensure soil sample is uniformly mixed, soil sample and water is equal
It is divided into more parts, is added in container is mixed several times.
In preferred embodiment, w=10.0% is each provided, 12.0%, 14.0%, 16.0%, 18.0%, 20.0%,
22.0% sample.
Step 5：Beat numbers stir evenly the remoulded sample that step 4 prepares moisture content, are added in mold several times
It carries out hitting reality；
The mold has columnar formations chamber (not shown), and soil sample is inserted along its length carries out Beat numbers in mold,
Forming cavity described in preferred embodiment uses rectangular parallelepiped structure, to obtain the sample of cuboid.Before being put into remoulded sample, mould
Has inner wall coating lubricating oil；
When carrying out multiple Beat numbers operation, the joint face of soil sample and next layer of soil sample that each layer is hit after reality is carried out
Hair processing is dug, so that the soil sample surface after making to hit reality is more coarse, increases the binding force with next layer of soil sample, soil sample is improved and combines
Intensity.
Step 6：Heating, molding soil sample is removed from the molds, is heated to assigned temperature after carrying out water conservation processing；
The water conservation processing is specially first to wrap up sample with plastic film, is then wrapped up with roll paper and is sealed using adhesive tape
Mouthful, so that it is guaranteed that moisture will not be lost；When heated, will water conservation treated that sample is put into the heating vessel containing sand,
Sample is buried with sand, vessel are put into 8-10 hour of heating in heater box, so that it is guaranteed that sample is heated evenly.Heating vessel
Preferably metal material, sand select Extra-fine sand.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical scheme and beneficial effects
It describes in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, not
It is any modification that those of ordinary skill in the art make the present invention, equivalent under the premise of being detached from the spirit and principles in the present invention
Replacement, improvement etc., should all fall within the protection scope that claims of the present invention determines.
Claims (12)
1. the device that a kind of test soil body is uniaxially stretched rheological behavior, it is characterised in that：Including testing stand and it is set to testing stand
On pedestal, two sides are respectively arranged with and the stationary fixture that is fixedly connected of sample both ends in cylinder the pedestal along its length
And floating holder, floating holder and driving unit cooperate, driving unit can drive floating holder to move along pedestal length direction；
The water conservation unit for preventing sample moisture content from losing and the control temperature unit for keeping specimen temperature can be sealed by also having on the outside of pedestal；Institute
Levelness can be adjusted relative to testing stand by stating pedestal.
2. the device that a kind of test soil body according to claim 1 is uniaxially stretched rheological behavior, it is characterised in that：It is described solid
Clamp tool and floating holder are at least open cavity body structure of opposite face.
3. the device that a kind of test soil body according to claim 1 is uniaxially stretched rheological behavior, it is characterised in that：The examination
It tests on platform and is respectively fixed with a leveling bolt in pedestal quadrangle, the pedestal quadrangle is each passed through leveling bolt；The leveling
Bolt is respectively arranged with a nut in pedestal upper and lower surface.
4. the device that a kind of test soil body according to claim 1 is uniaxially stretched rheological behavior, it is characterised in that：The drive
Moving cell includes the pulley being fixed on pedestal and the traction rope with floating holder secure fit, the pulley and stationary fixture and
Floating holder is on same straight line and in side of the floating holder far from stationary fixture；Traction rope end is fixed with for putting
The Support tray of weight is set, the traction rope is fixedly connected far from the side of stationary fixture with floating holder and bypasses in the horizontal direction
Pulley hangs Support tray along the vertical direction.
5. the device that a kind of test soil body according to claim 4 is uniaxially stretched rheological behavior, it is characterised in that：The guarantor
Water unit is the cuboid cavity being fastened on pedestal, and the stationary fixture and floating holder are in inside water conservation unit；It is living
Dynamic fixture being capable of the free movement inside water conservation unit；The water conservation unit at least top is dismountable transparent baffle, water conservation
Unit has the first through hole passed through for traction rope close to one end of pulley.
6. the device that a kind of test soil body according to claim 4 is uniaxially stretched rheological behavior, it is characterised in that：The control
Warm unit includes the closed rectangular enclosing being vertically arranged on the outside of water conservation unit and is detachably secured to the rectangle side of blocking
Transparent enclosing；It is fixed with insulation board on the outside of rectangle enclosing, inside is provided with infrared ray heating tube and temperature-sensing probe, and rectangle enclosing leans on
The side of nearly pulley has the second through-hole passed through for traction rope.
7. the device that a kind of test soil body according to claim 6 is uniaxially stretched rheological behavior, it is characterised in that：The guarantor
Warm plate is the insulation foam plate pasted on the outside of rectangle enclosing.
8. the device that a kind of test soil body according to claim 1 is uniaxially stretched rheological behavior, it is characterised in that：Described
Also with spirit level and for the track of floating holder movement on seat, the track length direction is parallel with pedestal length direction.
9. a kind of device to test soil body list for being uniaxially stretched rheological behavior using the described in any item test soil bodys of claim 1-8
The method of axis draft flowing deformation characteristic, it is characterised in that：Include the following steps：
Step a：Sample is installed, the transparent enclosing of control temperature unit and the transparent baffle of water conservation unit are removed, in stationary fixture and work
Binder is smeared in the inside of dynamic fixture respectively, and the prefabricated cylindricality sample with certain temperature is horizontally arranged, sample both ends point
Inner adhesion not with stationary fixture and floating holder is fixed, and then retightens transparent baffle and transparent enclosing, and by temperature control
Unit powers on；
Step b：Leveling adjusts the nut on pedestal four-corner leveling bolt, keeps spirit level display horizontal；
Step c：Image is obtained, the camera of face sample is fixed above pedestal, camera is for obtaining specimen surface image；
Step d：Apply stress, counterweight is put on Support tray, each weight keeps certain creep time, and obtains by camera
Sample Image at this time increases load step by step, until sample fracture；
Step e：Data are obtained, is handled by applying the image obtained after specific time to every grade of stress, obtains sample table
The draft flowing deformation characteristic of sample at a certain temperature is obtained by calculation in the strain variation situation in face.
10. a kind of method that the test soil body is uniaxially stretched rheological behavior according to claim 9, it is characterised in that：Step a
In, the end face and side of stationary fixture and floating holder are provided with sheet rubber, the sample both ends of the surface and with stationary fixture and
The side of floating holder overlapping is adhesively fixed with the sheet rubber in stationary fixture and floating holder respectively.
11. a kind of method that the test soil body is uniaxially stretched rheological behavior according to claim 9, it is characterised in that：Step e
The middle method for obtaining sample strain is the image obtained using DIC technical treatment, and the strain refers to sample effective length model
The deformation enclosed, the effective length refer to the specimen length between stationary fixture and floating holder.
12. a kind of method that the test soil body is uniaxially stretched rheological behavior according to claim 11, it is characterised in that：Also wrap
The step of calculating sample Poisson's ratio υ is included,
Wherein, e1For the transverse strain in sample effective length, e0For axial strain in sample effective length.
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| CN201811035720.6A CN108918290A (en) | 2018-09-06 | 2018-09-06 | The test soil body is uniaxially stretched the device and method of rheological behavior |
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| CN201811035720.6A CN108918290A (en) | 2018-09-06 | 2018-09-06 | The test soil body is uniaxially stretched the device and method of rheological behavior |
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Cited By (5)
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| CN111965019A (en) * | 2020-07-23 | 2020-11-20 | 河海大学 | Visual integral type soil body unipolar stretching device breaks |
| CN111982674A (en) * | 2020-07-23 | 2020-11-24 | 河海大学 | Height-adjustable soil body uniaxial stretching device with sliding rod |
| CN112213188A (en) * | 2020-09-16 | 2021-01-12 | 江苏华久辐条制造有限公司 | Method for detecting strength of cold-rolled strip steel |
| CN113008691A (en) * | 2021-02-01 | 2021-06-22 | 南京航力机电设备有限公司 | Vibration testing machine for metal corrugated pipe |
| CN113008692A (en) * | 2021-02-01 | 2021-06-22 | 南京航力机电设备有限公司 | Tensile testing machine for metal corrugated pipe |
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| CN113008691A (en) * | 2021-02-01 | 2021-06-22 | 南京航力机电设备有限公司 | Vibration testing machine for metal corrugated pipe |
| CN113008692A (en) * | 2021-02-01 | 2021-06-22 | 南京航力机电设备有限公司 | Tensile testing machine for metal corrugated pipe |
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Application publication date: 20181130 |