CN208476690U - A kind of buckle changing of the relative positions type Plane Strain Test device - Google Patents
A kind of buckle changing of the relative positions type Plane Strain Test device Download PDFInfo
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- CN208476690U CN208476690U CN201821023419.9U CN201821023419U CN208476690U CN 208476690 U CN208476690 U CN 208476690U CN 201821023419 U CN201821023419 U CN 201821023419U CN 208476690 U CN208476690 U CN 208476690U
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- chisel teeth
- pressure chamber
- plane strain
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Abstract
The utility model relates to a kind of buckle changing of the relative positions type Plane Strain Test devices, it is arranged in true triaxil tester pressure chamber, pressure chamber includes pressure chamber's bottom plate, top cover and outer cylinder, two groups of chisel teeth Shuan Ban plane strain mechanisms are symmetrical arranged in pressure chamber, chisel teeth Shuan Ban plane strain mechanism includes chisel teeth steel frame plate, chisel teeth smooth surface rigid baffle, unloading bolt, loading bolt and pressure cell；Chisel teeth Shuan Ban plane strain mechanism is arranged in the utility model in traditional three-dimensional independent loads true triaxil tester pressure chamber, it is moved by the horizontal pressure that chisel teeth steel frame plate completes chisel teeth smooth surface rigid baffle with the first chisel teeth group of chisel teeth smooth surface rigid baffle and the second chisel teeth group phase changing of the relative positions, the structure combines existing true triaxial pressure chamber to carry out Plane Strain Test to rock-soil material, the independent control and measurement of principal stress on progress plane strain direction that can be accurate and stable, to obtain the intensity and deformation characteristic under the conditions of plane strain state for reflecting the rock-soil material.
Description
Technical field
The utility model belongs to geotechnical engineering test equipment technical field, is related to a kind of for putting down in true triaxial test research
The device that soil mechanical properties are tested under the strained condition of face, specially a kind of buckle changing of the relative positions type Plane Strain Test device.
Background technique
In practical projects, many engineering problems (such as deep basal pit, retaining wall, high-filled embankment, dam, tunnel) all in
Or it is approximately at plane strain state, and at present for the engineering of plane strain problems, in design, the selection of parameter is generally all
It is to be determined according to normal triaxial or direct shear test, does not consider the constraint in intermediate principal stress direction and stress under plane strain condition
Change the intensity contribution to soil.Therefore, determine that the mechanical characteristic of the soil body can give full play to the strong of soil according to Plane Strain Test
Degree improves engineering economy.
Since Kjellman(1936) true triaxil tester of 3 groups of rigid baffle loading methods parallel to each other that it is developed
It is transformed, the displacement by limiting principal direction of stress a pair of rigid baffle can apply plane strain stress to cuboid sample
State, which is being considered as earliest plane strain device, but the loading mechanism of the instrument is complicated, and two neighboring side
To load plate interfere with each other.Hambly, Jakobson and Roscoe etc. are later with the developed plane strain device of Kjellman
Based on have developed similar plane strain tester, but the quasi-instrument still it is more difficult overcome intersect and generate between each rigid plate
Stress, strain corner interference effect.Then, Wood improves pressure chamber on this basis, and sample is strip, the instrument base
Originally plane strain condition is realized, due to increasing acting surface length, increases the frictional force on the face, during leading to test
There are shear stress on centering main stress action surface, and accuracy in measurement declines.Green develops the plane strain of small size sample
Instrument, though reducing the frictional force between load plate and sample, the range for making loading device mobile simultaneously is larger, causes to test
Process implements more difficult.The common disadvantage of this kind of plane strain instrument be rigid, soft interface mutual extrusion problem and sample with
Friction between restraining plate will affect the accuracy of test result.Based on normal triaxial pressure chamber and true triaxil tester pressure chamber into
The corresponding plane of row should be transformed be plane strain instrument development one of important trend.Two blocks of steel are added in triaxial pressure room
Plate realizes the booming fast development for having driven plane strain instrument of the shearing true triaxil tester of plane strain state, this kind of flat
Face deformeter is to be transformed in the pressure chamber of true triaxil tester and Stress Control system, or directly adopt true triaxil tester mostly
To complete Plane Strain Test.Referring to Fig. 6, there is independent device during loading to guarantee that strain=0 in direction, direction is
Rigid constraint, direction are rigidity load, and direction is loaded using flexible water bladder.Pressure chamber's disadvantage after these two types repacking is rigidity
Friction between plate and soil sample will affect the measurement and test result of axial force, and can not achieve σ mostly2The amount of direction upper stress
It surveys.
The existing plane strain system based on true triaxial pressure chamber transformation, principle simple possible, though realize direction
Strain=0, but the plane strain state in Practical Project corresponds to specific strained condition=0, does not correspond to specific stress item
Part.Existing transformation only meets deformation condition, and can not carry out to its horizontal displacement after being packed into pressure chamber due to rigid baffle
Regulation, can not be to σ in the sample consolidation stage so will cause2Direction applies consolidation stresses, so that the master on plane strain direction
Stress σ2It is not up to consolidation stress in the consolidation stage, causes the soil body when starting to shear the initial stage, σ2Principal stress on direction is real
For minor principal stress, with shear-deformable continuous development, just gradually development is intermediate principal stress, at this point, the soil body just actually enter it is flat
Face strain regime.Just because of this species diversity, cause existing instrument that cannot simulate plane strain native in Practical Project completely
State.
Summary of the invention
The application provides a kind of buckle changing of the relative positions type Plane Strain Test device, eliminates existing defect, so that new after improving
Plane strain mechanism of pressure chamber not only can guarantee good operability, but also can make soil plane strain state more meet practical work
Journey situation.
In order to achieve the above object, the technical solution of the utility model is as follows:
A kind of buckle changing of the relative positions type Plane Strain Test device is arranged in true triaxil tester pressure chamber, the true triaxil tester pressure
Power room includes pressure chamber's bottom plate, pressure chamber's top cover and pressure chamber's outer cylinder, which is characterized in that right in the true triaxil tester pressure chamber
Claim setting two groups of chisel teeth Shuan Ban plane strain mechanisms, the chisel teeth Shuan Ban plane strain mechanism include chisel teeth steel frame plate,
Chisel teeth smooth surface rigid baffle, unloading bolt, loading bolt and pressure cell；The rear end face of the chisel teeth steel frame plate and pressure chamber
Outer cylinder abuts, and is provided with the first chisel teeth group on chisel teeth steel frame plate front end face；The rear end of the chisel teeth smooth surface rigid baffle
It is provided with the second chisel teeth group on face, two groups of pressure cells are embedded on the front end face of chisel teeth smooth surface rigid baffle；The chisel teeth
Steel frame plate is abutted with chisel teeth smooth surface rigid baffle by the first chisel teeth group and the second chisel teeth group, the first chisel teeth group and
The flank of tooth of the chisel teeth of two chisel teeth groups is staggered, and the unloading bolt and loading bolt are each passed through pressure chamber's bottom plate and pressure chamber
Top cover connects with the top of chisel teeth steel frame plate and bottom end；Chisel teeth steel frame plate is existed by the turn of unloading bolt and loading bolt
Vertical motion in the true triaxil tester pressure chamber, the first chisel teeth group and the second mutual changing of the relative positions of chisel teeth group make wedge in motion process
Shape tooth smooth surface rigid baffle horizontal movement.
Further, the pressure cell is type vibration wire soil pressure cell.
Further, the chisel teeth steel frame plate is made with chisel teeth smooth surface rigid baffle of stainless steel material.
Further, hollow bolt is set on pressure chamber's outer cylinder, and the data line of pressure cell passes through hollow bolt inner hole
It is external.
The utility model has the beneficial effects that
It is answered 1. the double plate planes of chisel teeth are arranged in the utility model in traditional three-dimensional independent loads true triaxil tester pressure chamber
Become mechanism, the double plates of chisel teeth include that chisel teeth steel frame plate and the chisel teeth smooth surface embedded with two pieces of type vibration wire soil pressure cells are rigidly kept off
Plate is completed by chisel teeth steel frame plate and the first chisel teeth group of chisel teeth smooth surface rigid baffle and the second chisel teeth group phase changing of the relative positions
The horizontal pressure movement of chisel teeth smooth surface rigid baffle, it is flat which combines existing true triaxial pressure chamber to carry out rock-soil material
Face strain-gauge test, the independent control and measurement for carrying out principal stress on plane strain direction that can be accurate and stable, to obtain anti-
Reflect the intensity and deformation characteristic under the conditions of plane strain state of the rock-soil material.
2. the utility model in two pieces of chisel teeth smooth surface rigid baffle center holes Kai Liang and is respectively embedded in one piece of type vibration wire
Soil pressure cell measures the stress generated when the soil body is in contact with it by four pieces of soil pressure cells and becomes to record direction principal stress numerical value
Change, and chooses larger-size type vibration wire soil pressure cell so that pressure cell can come into full contact with soil body sample surface, to disappear
Except the measurement of the plane strain direction principal stress as caused by the out-of-flatness of soil sample side is inaccurate during the test for existing plane strain instrument
True problem.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that the utility model mechanism is mounted on true triaxil tester pressure chamber；
Fig. 2 is that utility model mechanism is mounted on the indoor sectional view of true triaxil tester pressure；
Fig. 3 is the structural schematic diagram of the utility model chisel teeth steel frame plate；
Fig. 4 is the structural schematic diagram of the utility model chisel teeth smooth surface rigid baffle；
Fig. 5 is the cooperation schematic diagram of chisel teeth steel frame plate and chisel teeth smooth surface rigid baffle；
Fig. 6 is sample status under loading schematic diagram under plane strain stress path；
In figure, the pressure chamber 1- bottom plate, the pressure chamber 2- top cover, the pressure chamber 3- outer cylinder, 4- chisel teeth steel frame plate, 5- chisel teeth light
Face rigid baffle, 6- unload bolt, 7- loading bolt, 8- pressure cell, 9- hollow bolt.
Specific embodiment
The utility model is described in further detail below by specific embodiment combination attached drawing.It is wherein different to implement
Similar component uses associated similar element numbers in mode.In the following embodiments, many datail descriptions are
In order to enable the application can be better understood.However, those skilled in the art can recognize without lifting an eyebrow, it is part of
Feature is dispensed in varied situations, or can be substituted by other elements, material, method.In some cases,
The relevant some operations of the application are there is no display in the description or describe, this is the core in order to avoid the application
It is flooded by excessive description, and to those skilled in the art, these relevant operations, which are described in detail, not to be necessary,
They can completely understand relevant operation according to the general technology knowledge of description and this field in specification.
Referring to a kind of buckle changing of the relative positions type Plane Strain Test device of Fig. 1-Fig. 5, it is arranged in true triaxil tester pressure chamber, very
Triaxial apparatus pressure chamber includes the pressure chamber's bottom plate 1, pressure chamber's top cover 2 and pressure chamber's outer cylinder 3 of stainless bracing members, in true triaxil tester
Two groups of chisel teeth Shuan Ban plane strain mechanisms are symmetrical arranged in pressure chamber, chisel teeth Shuan Ban plane strain mechanism includes stainless steel
The chisel teeth steel frame plate 4 and chisel teeth smooth surface rigid baffle 5 of matter, and unloading bolt 6, loading bolt 7 and pressure cell 8, the pressure
Power pressure cell 8 is type vibration wire soil pressure cell；The height of chisel teeth steel frame plate 4 is less than the interior room height of true triaxil tester pressure chamber, wedge
The rear end face of shape tooth steel frame plate 4 is shiny surface and to abut with pressure chamber's outer cylinder 3, and the is provided on 4 front end face of chisel teeth steel frame plate
One chisel teeth group, the first chisel teeth group include the chisel teeth of multiple groups on the same line；The height of chisel teeth smooth surface rigid baffle 5
It is identical as the interior room height of true triaxil tester pressure chamber, the second chisel teeth is provided on the rear end face of chisel teeth smooth surface rigid baffle 5
Group, the second chisel teeth group include the chisel teeth of multiple groups on the same line, are embedded on the front end face of chisel teeth smooth surface rigid baffle 5
The data line of two groups of pressure cells 8, two groups of pressure cells 8 is external by 9 inner hole of hollow bolt；Chisel teeth steel frame plate 4 and chisel teeth light
Face rigid baffle 5 is abutted by the first chisel teeth group and the second chisel teeth group, the wedge of the first chisel teeth group and the second chisel teeth group
The flank of tooth of shape tooth is staggered, unload screw hole that bolt 6 and loading bolt 7 are each passed through on pressure chamber's bottom plate 1 and pressure chamber's top cover 2 with
The top and bottom end of chisel teeth steel frame plate 4 abut against；The turn that chisel teeth steel frame plate 4 passes through unloading bolt and loading bolt
The vertical motion in true triaxil tester pressure chamber, the first chisel teeth group makes with the second mutual changing of the relative positions of chisel teeth group in its motion process
5 horizontal movement of chisel teeth smooth surface rigid baffle.
The course of work of the utility model buckle changing of the relative positions type Plane Strain Test device is described below:
After sample is installed in true triaxil tester pressure chamber, each a pair of of wedge is vertically put into the pressure chamber two sides in plane strain direction
Shape tooth steel frame plate 4 and chisel teeth smooth surface rigid baffle 5, minor principal stress direction confining pressure applying mode and existing true triaxil tester operation one
It causes；Pressure chamber's top cover 2 is covered, by taking side as an example, it is chisel teeth steelframe that unloading bolt 6 is first back-outed pressure chamber's bottom plate 1 clockwise
Plate 4 moves slot milling vertically downward, then loading bolt 7 is put into the screw hole of pressure chamber's top cover 2 and is rotated clockwise, and loads spiral shell
Bolt 7 vertically decline until top is to 4 top of chisel teeth steel frame plate and heads on it and moves vertically downward, to make chisel teeth steel frame plate 4
The first chisel teeth group and the second chisel teeth group between chisel teeth smooth surface rigid baffle 5 generate the mutual changing of the relative positions, make chisel teeth light
Face rigid baffle 5 is to pressure indoor sport, to push chisel teeth smooth surface rigid baffle 5 inwardly and sample close contact, to examination
Sample applies confining pressure.
If when more bigger than setting confining pressure when can be manually rotated the confining pressure that the contracting of loading bolt 7 applies, first rotation load counterclockwise
Bolt 7 is that chisel teeth steel frame plate 4 moves slot milling, the unloading bolt on another mistake hour hands rotational pressure room bottom plate 1 vertically upward
6, make to unload 6 vertical ascent top of bolt to 4 bottom end of chisel teeth steel frame plate, pushes chisel teeth steel frame plate 4 to move vertically upward, make wedge
The first chisel teeth group and the second chisel teeth group between shape tooth steel frame plate 4 and chisel teeth smooth surface rigid baffle 5 generate gap, thus
Confining pressure is discharged, stops rotating immediately after confining pressure reaches setting value and unloads bolt 6, while rotating clockwise loading bolt 7 to make wedge
Shape tooth steel frame plate 4 retightens, and moving horizontally for limitation chisel teeth smooth surface rigid baffle 5 keeps plane strain in this direction
Stress-strain state.
When test, chisel teeth smooth surface rigid baffle 5 is generated with the increase of axial compressive force, soil deformation compression
It will lead to chisel teeth and generate the mutual changing of the relative positions pair, so that chisel teeth steel frame plate 4 is generated the trend moved vertically upward, but due to loading spiral shell
Bolt 7 is fixed to move chisel teeth steel frame plate 4 can not vertically upward, to ensure that the strain in direction during the test is begun
It is eventually zero.
It is blocked and true triaxil tester pressure chamber as far as possible in Fig. 1 as it can be seen that the nose width of chisel teeth smooth surface rigid baffle 5 is increased
Gap, advantageously ensure that the normal use of minor principal stress direction latex mould in test in this way.
The utility model is the improvement made on the basis of original true triaxil tester, is answered in the double plate planes of above-mentioned chisel teeth
Become except mechanism design, the utility model others improve content and include:
=1 * GB3 1., closed structure outside plane strain pressure room
True triaxil tester pressure chamber is made of pressure chamber's bottom plate, pressure chamber's top cover and pressure chamber's outer cylinder, and material belongs to smooth surface
Stainless steel material.Top cover transformation place in pressure chamber's is to answer top plate and base plate plane nyctitropic two sides face chisel teeth steelframe
M10 screw hole is opened at the vertically both ends at plate center, and installation length is the M10 bolt of 45mm；The design of outer cylinder and existing true three
Axis instrument is consistent.
=2 * GB3 2., plane strain pressure chamber interior structure
Internal structure transformation in pressure chamber's is to eliminate in former true triaxil tester for obstructing four pieces of partitions of flexible water bladder, leads to
It crosses to add the strain of the double trigger structures limitations of a pair of of chisel teeth in this direction in plane strain symmetry direction and develop and be answered with simulating plane
Change state, and the gap left after partition is removed in the width closing for lengthening rigid baffle, the emulsion capsule after preventing water filling from pressurizeing bores
Enter gap and breakage occurs, it is ensured that chisel teeth smooth surface rigid baffle and emulsion capsule can be contacted directly with soil body sample, to make side
Soil body sample can be normally transmitted to confining pressure.
3., intermediate principal stress Load-unload mechanism
When soil sample starts consolidation, intermediate principal stress σ2It is that the smooth surface rigid baffle that has chisel teeth by the manual control back side is inside
It moves horizontally, extrusion soil test block and the pressure that generates are provided.The mode that moves horizontally of chisel teeth smooth surface rigid baffle is logical
Crossing two nuts rotated clockwise in balancing gate pit's top board manually moves nut vertically downward, until top is rigid to chisel teeth smooth surface
Chisel teeth steel frame plate on the outside of property baffle moves steel frame plate vertically downward, to make the wedge shape between steel frame plate and rigid baffle
Tooth generates the mutual changing of the relative positions.Since pressure chamber's outer cylinder on the outside of steel frame plate limits the horizontal position of chisel teeth changing of the relative positions generation outward
It moves, therefore horizontal displacement can only develop into pressure chamber, so that the inside extrusion soil test block of rigid baffle be pushed to apply confining pressure.?
When carrying out compression-shear test, soil deformation also can wedge between steel frame plate and rigid baffle to the compression of the generation of rigid baffle
Shape tooth generates the mutual changing of the relative positions pair, but move steel frame plate can not vertically upward since nut location is motionless, thus in test process
In limit soil body strain in this direction always and develop to simulate2=0 plane strain state.In addition, such as plane strain side
There is situation bigger than normal in upward stress, nut can be made to move vertically upward by two nuts that can be manually rotated on pressure chamber's bottom plate
It is dynamic, so that the double plates of chisel teeth be made to generate the reverse changing of the relative positions to unload confining pressure, the reasonability of guarantee test.
Minor principal stress σ3Direction consolidates compression system and is consistent with former true triaxil tester.Controlled by microcomputer, consolidation pressure by
Servo step motor push hydraulic cylinder piston generate it is hydraulic, it is hydraulic flexible hydraulic emulsion capsule is transmitted to by pipeline after be applied to soil
Body sample.Hydraulic bag squeezes into intermediate principal stress direction rigid plate during the test and pressure chamber gap is destroyed to avoid, therefore
One layer of TR thin rubber film is placed between hydraulic bag and soil sample, hydraulic bag is wrapped up, to close gap.
Use above specific case is illustrated the utility model, is merely used to help understand the utility model, and
Not to limit the utility model.Think of for those skilled in the art of the present invention, according to the utility model
Think, several simple deductions, deformation or replacement can also be made.
Claims (4)
1. a kind of buckle changing of the relative positions type Plane Strain Test device is arranged in true triaxil tester pressure chamber, the true triaxil tester pressure
Room includes pressure chamber's bottom plate (1), pressure chamber's top cover (2) and pressure chamber's outer cylinder (3), which is characterized in that in the true triaxil tester pressure
Two groups of chisel teeth Shuan Ban plane strain mechanisms are symmetrical arranged in power room, the chisel teeth Shuan Ban plane strain mechanism includes chisel teeth
Steel frame plate (4), chisel teeth smooth surface rigid baffle (5), unloading bolt (6), loading bolt (7) and pressure cell (8)；The chisel teeth
The rear end face of steel frame plate (4) is abutted with pressure chamber's outer cylinder (3), is provided with the first chisel teeth on chisel teeth steel frame plate (4) front end face
Group；The second chisel teeth group, chisel teeth smooth surface rigid baffle are provided on the rear end face of the chisel teeth smooth surface rigid baffle (5)
(5) two groups of pressure cells are embedded on front end face；The chisel teeth steel frame plate (4) and chisel teeth smooth surface rigid baffle (5) pass through the
One chisel teeth group and the second chisel teeth group abut, and the flank of tooth of the chisel teeth of the first chisel teeth group and the second chisel teeth group is staggered, institute
It states unloading bolt and loading bolt is each passed through the top of pressure chamber's bottom plate (1) and pressure chamber's top cover (2) and chisel teeth steel frame plate
Connect with bottom end；Chisel teeth steel frame plate (4) is by the turn of unloading bolt and loading bolt in the true triaxil tester pressure chamber
Vertical motion, the first chisel teeth group and the second mutual changing of the relative positions of chisel teeth group make chisel teeth smooth surface rigid baffle (5) in motion process
Horizontal movement.
2. buckle changing of the relative positions type Plane Strain Test device according to claim 1, which is characterized in that the pressure cell (8)
For type vibration wire soil pressure cell.
3. buckle changing of the relative positions type Plane Strain Test device according to claim 1 or 2, which is characterized in that the chisel teeth
Steel frame plate (4) is made with chisel teeth smooth surface rigid baffle (5) of stainless steel material.
4. buckle changing of the relative positions type Plane Strain Test device according to claim 3, which is characterized in that pressure chamber's outer cylinder
(3) hollow bolt (9) are set on, the data line of pressure cell (8) is external by hollow bolt (9) inner hole.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821023419.9U CN208476690U (en) | 2018-06-29 | 2018-06-29 | A kind of buckle changing of the relative positions type Plane Strain Test device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821023419.9U CN208476690U (en) | 2018-06-29 | 2018-06-29 | A kind of buckle changing of the relative positions type Plane Strain Test device |
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| CN208476690U true CN208476690U (en) | 2019-02-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108871933A (en) * | 2018-06-29 | 2018-11-23 | 西安工业大学 | The chisel teeth Shuan Ban plane strain mechanism of true triaxial pressure chamber |
-
2018
- 2018-06-29 CN CN201821023419.9U patent/CN208476690U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108871933A (en) * | 2018-06-29 | 2018-11-23 | 西安工业大学 | The chisel teeth Shuan Ban plane strain mechanism of true triaxial pressure chamber |
| CN108871933B (en) * | 2018-06-29 | 2024-01-26 | 西安工业大学 | Wedge-shaped tooth double-plate plane strain mechanism of true triaxial pressure chamber |
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