CN110132719A - The geotechnological deformable large scale soil box structure of true triaxial test - Google Patents
The geotechnological deformable large scale soil box structure of true triaxial test Download PDFInfo
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- CN110132719A CN110132719A CN201910483900.9A CN201910483900A CN110132719A CN 110132719 A CN110132719 A CN 110132719A CN 201910483900 A CN201910483900 A CN 201910483900A CN 110132719 A CN110132719 A CN 110132719A
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- 238000012360 testing method Methods 0.000 title claims abstract description 61
- 239000002689 soil Substances 0.000 title claims abstract description 44
- 241001314948 Bursaria incana Species 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims description 13
- 238000007789 sealing Methods 0.000 claims description 11
- 238000009428 plumbing Methods 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 5
- 230000001351 cycling effect Effects 0.000 claims description 4
- 238000013461 design Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000013519 translation Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241000274582 Pycnanthus angolensis Species 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 239000011087 paperboard Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
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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
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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
- G01N2203/025—Geometry of the test
- G01N2203/0256—Triaxial, i.e. the forces being applied along three normal axes of the specimen
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The present invention discloses a kind of deformable large scale soil box structure of geotechnological true triaxial test, it is mainly used for geotechnological true triaxial test big-size model test, including workbench, lateral load plate, normal direction load plate and bottom plate, native box main body is surrounded by four pieces of vertical lateral load plates of receiving horizontal loading, it is connected between adjacent side load plate by being directed laterally to device, the top of native box main body is arranged in normal direction load plate, and the periphery of normal direction load plate is provided with Normal Constraint frame, normal direction load plate guiding device is additionally provided in normal direction load plate.This programme uses the combined application of Normal Constraint frame and normal direction load plate, can be realized the vertical finite deformation of native case, guarantees and the right angle between plate and plate connects；By lateral loading device, it is directed laterally to device and side-tracking skate etc. and cleverly designs, realize the real-time coaxial load of native case free, limited deformation and horizontal direction, the safety and reliability for ensuring entire true triaxial test system operation, has significant economic and practical value.
Description
Technical field
The invention belongs to soil mechanics laboratory test technical fields, and in particular to a kind of deformable big ruler of geotechnique's true triaxial test
Inch of land box structure is suitable for geotechnological true triaxial test.
Background technique
Geotechnological true triaxial test system can simulate the mechanical characteristic that three direction unequal stresses act on the lower soil body.Relative to
Ordinary triaxial test system, true triaxial test can more reasonably explain the mechanical characteristic of the soil body under the conditions of actual place.In geotechnique
In true triaxial test system, 3 directions are non-equivalent load, i.e. three directions apply stress and meet σ1> σ2> σ3.So
In true triaxial test system, soil sample is cube specimen, by applying the stress to differ in size in three orthogonal directions, really
React mechanical characteristic of the soil sample under unequal stress effect.
Currently, conventional triaxial test and true triaxial test system often uses lesser sample, essence is experimental tests, because
Test specimen is smaller and can not arrange compared with multisensor (the excessively multipair test specimen performance of sensor arrangement is affected), and test specimen scale is imitated
Answer problem larger, i.e., test specimen is smaller, and scale influences test result bigger.In order to avoid specimen size is too small and the more biography of arrangement
Influence of the sensor to sample character needs to design large scale soil box structure system, while requiring the soil case for true triaxial test
Structural system changes with the variation of stress suffered by soil sample.
Summary of the invention
The present invention is to solve the deficiency of experimental tests in existing true triaxial test, while meeting native case and becoming with stress suffered by soil sample
Change and change, proposes deformable large scale soil box structure in a kind of geotechnological true triaxial test, can be used for carrying out geotechnological true
Three axis big-size model tests guarantee that native case is different according to the principal stress of application and reasonable, limited change occurs during the test
Shape, the safety of guarantee test.
The present invention, which is that the following technical solution is employed, to be realized:
The deformable large scale soil box structure of a kind of geotechnique's true triaxial test, for geotechnological true triaxial test large scale model examination
It tests, including workbench, lateral load plate, normal direction load plate and bottom plate, by four pieces of vertical lateral load plates of receiving horizontal loading
A native box main body is surrounded, the lower section of native box main body is fixed on the table and be located to bottom plate, and it is permeable to be additionally provided with bottom on bottom plate
Plate；
It is connected between adjacent side load plate by being directed laterally to device, guarantees that lateral load plate is along side in loading procedure
The dynamic fortune of translation occurs to guiding device, and is additionally provided in the lateral load plate to apply the lateral of horizontal direction load
Loading device；The top of native box main body is arranged in normal direction load plate, is provided in normal direction load plate to apply Normal stress
Normal direction loading device；
It is additionally provided with side-tracking skate on the outside of lateral load plate, lateral loading device is mounted on side-tracking skate
On, lateral loading device can horizontally slip along side-tracking skate, and to realize, three axis principal stress axle center are corresponding during loading,
When native case size changes under triaxial stress, realize that three axis principal stress axle center correspondences are very crucial.
Further, it is additionally provided with Normal Constraint frame in the periphery of the normal direction load plate, Normal Constraint frame is located at
The top of lateral load plate is additionally provided with normal direction load plate guiding device in normal direction load plate, also sets above Normal Constraint frame
It is equipped with Normal Constraint frame loading device；Normal Constraint frame loading device is arranged in Normal Constraint frame two sides, it is ensured that is being tried
Normal Constraint frame does not twist during testing, while closely connecting with lateral load plate, it is ensured that native case during loading
The interior soil body does not overflow outward, and normal direction load plate passes through Normal Constraint frame, native into native case under the action of normal direction loading device
Body applies Normal stress.
Further, the normal direction load plate guiding device includes guide sleeve and guide rod, and guide sleeve fixed setting is in place
In support plate at the top of the normal direction load plate, guide rod is moved up and down under the action of normal direction loading device along guide sleeve, effectively
Normal direction load plate twists when normal direction loading device being avoided to be further applied load, the reliable progress of guarantee test.
Further, the sliding in order to facilitate adjacent side load plate and its between bottom plate, the lateral load plate
Three sides are laid with multiple Universal casters, and lateral load plate is connect by the Universal caster on the side of top with Normal Constraint frame
Touching connection, is connect by the Universal caster in bottom sides with contacts baseplate, while passing through the Universal caster and phase on vertical side
Adjacent lateral load plate connects, to reduce the friction generated when the movement of lateral load plate.
Further, the device that is directed laterally to includes limit sliding chutes and limited post, and limit sliding chutes and limited post are right respectively
That answers is arranged in adjacent lateral load plate, ensures that excessive deformation cannot occur for native case by limit sliding chutes, that is, plays limit
The effect of position can guarantee that the native case of test is deformable again, it is ensured that the safety of test.
Further, the side of the Universal caster also sets up backstop column, the top surface of backstop column and Universal caster
Either flush, the backstop column are located at close to the side of the soil body, realize and Normal Constraint frame, adjacent side load plate and bottom
The close contact of plate.
Further, the size of the bottom plate is greater than the size of the cross section of native box main body, and centre bit is equipped in bottom plate
Plumbing groove, for laying cold cycling pipe, bottom plate is equipped with annular column, and it is recessed to form plumbing between adjacent annular column
Slot, and the depth of plumbing groove successively shoals outward from the center of bottom plate, to facilitate draining.
Further, the top surface of the cold cycling pipe is slightly less than the top surface with annular column, and bottom porous disc is arranged in
The top surface of annular column, bottom porous disc are flushed with plate outer side surface.
Further, setting is additionally provided with water-proof sealing strip in the native box main body, and the water-proof sealing strip is a rectangle frame
Frame structure uses water-proof sealing strip by internal between lateral load plate, to prevent soil sample in loading procedure from seeping water outward.
Further, for convenience of testing, hydraulic lifting wheel is additionally provided with below workbench.
Compared with prior art, the advantages and positive effects of the present invention are:
Scheme proposed by the invention, the soil box structure simple structure, stress is clear, safe and reliable, in particular by method
To the combined application of constraint frame and normal direction load plate, the vertical finite deformation of native case can be realized, guarantee between plate and plate
Right angle connection；It by lateral loading device, is directed laterally to device and side-tracking skate etc. and cleverly designs, realize native case
Freely, the real-time coaxial load of limited deformation and horizontal direction, it is ensured that test the safety of process；Simultaneously by laterally loading
The design of Universal caster, effectively reduces the friction between plate and plate on three sides of plate；This programme is easy to process, it is real to be convenient for
It is existing, the safety and reliability of entire large scale true triaxial test system operation can be effectively improved, it is ensured that entire true triaxial test
The safety of system operation, reliability have significant economic and practical value.
Detailed description of the invention
Fig. 1 is the overall structure diagram of large scale soil box structure described in the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of soil box main body described in the embodiment of the present invention；
Fig. 3 is that normal direction load plate is placed in the structural schematic diagram in Normal Constraint frame in the embodiment of the present invention；
Fig. 4 is the structural schematic diagram of normal direction load plate structure and support plate in the embodiment of the present invention；
Fig. 5 is the enlarged structure schematic diagram that device is directed laterally in the embodiment of the present invention；
Fig. 6 is the structural schematic diagram of water-proof sealing strip in the embodiment of the present invention；
Fig. 7 is the structural schematic diagram of insole board of the embodiment of the present invention and bottom porous disc；
Fig. 8 is the partial schematic sectional view of Universal caster in the embodiment of the present invention.
Specific embodiment
In order to which the above objects, features and advantages of the present invention is more clearly understood, with reference to the accompanying drawing and implement
The present invention will be further described for example.
A kind of embodiment 1, the deformable large scale soil box structure of geotechnique's true triaxial test, is mainly used for geotechnological true triaxial test
Big-size model test is influenced to ensure model test nucleus not by boundary condition and sensor arrangement, such as Fig. 1 and 2
Shown, for the overall schematic of the native box structure, the soil box structure includes workbench 1, lateral load plate 7, normal direction load
Plate 10 and bottom plate 2, the vertical lateral load plate 7 for bearing four pieces of horizontal loading surround native box main body, and bottom plate 2 is fixed on workbench
On 1 and it is located at the lower section of native box main body, is additionally provided with bottom porous disc 3 on bottom plate 2, the size of native box main body is long 1.2m × wide
1.2m × high 1.0m is connected between adjacent side load plate 7 by being directed laterally to device 6, guarantees laterally to load in loading procedure
Laterally the dynamic fortune of translation occurs plate 7 for guiding device 6, and is additionally provided with lateral loading device 4 in each lateral load plate 7,
To apply the load of horizontal direction；
It continues to refer to figure 1, the top of native box main body is arranged in normal direction load plate 10, and sets in the periphery of normal direction load plate 10
It is equipped with Normal Constraint frame 9, Normal Constraint frame 9 is placed in the top of lateral load plate 7, is additionally provided in normal direction load plate 10
Normal direction load plate guiding device 12 is additionally provided with Normal Constraint frame loading device 11, normal direction load above Normal Constraint frame 9
Normal direction loading device 13 is provided with above plate 10, to realize that normal direction loads.As shown in Figures 3 and 4, in 9 two sides of Normal Constraint frame
Arrange Normal Constraint frame loading device 11, it is ensured that Normal Constraint frame 9 does not twist during the test, at the same with it is lateral
Load plate 7 closely connects, it is ensured that the soil body does not overflow outward in native case during loading, and constraint frame loading device 11 can be adopted
With hydraulic servo device etc., it is not described here in detail.Normal direction load plate 10 passes through Normal Constraint frame 9, in normal direction loading device 13
Under the action of into native case the soil body apply Normal stress, 10 two sides of normal direction load plate arrange four normal direction load plate guiding devices
12, as shown in Figures 3 and 4, normal direction load plate guiding device 12 includes guide sleeve 121 and guide rod 122, and the fixation of guide sleeve 121 is set
It sets in the support plate 15 at 10 top of normal direction load plate, for guide rod 122 under the action of normal direction loading device 13, guide sleeve is arrived on edge
121 move up and down, and normal direction load plate 10 twists when normal direction loading device 13 effectively being avoided to be further applied load, guarantee test can
By carrying out.
It is emphasized that the outside of lateral load plate 7 is additionally provided with side-tracking skate 5, lateral loading device 4 is installed
On side-tracking skate 5, lateral loading device 4 can horizontally slip along side-tracking skate 5, realize three axis during loading
Principal stress axle center is corresponding, when native case size changes under triaxial stress, realizes that three axis principal stress axle center correspondences are very
Crucial.
For convenience of test, the lower section of workbench 1 is additionally provided with hydraulic lifting wheel 16, and in the present embodiment, the size of bottom plate 2 is big
In the planar dimension of native box main body, the size of bottom plate is long 1.5m × wide 1.5m；It is recessed to be equipped with plumbing for centre bit in bottom plate 2
Slot, is used for cold cycling pipe 18, and the planar dimension of bottom porous disc 3 is a length of 1.0m × wide 1.0m, the surface of bottom porous disc 3
With the either flush of bottom plate 2, as illustrated in figures 1 and 7, bottom 3 is equipped with annular column, forms plumbing between adjacent annular column
Groove, and the depth for more arriving center discharge sink is deeper, to facilitate draining；
In addition, being additionally provided with water-proof sealing strip 8 in native box main body, the structure of the water-proof sealing strip 8 is as shown in fig. 6, be
One rectangular frame structure uses water-proof sealing strip 8 by internal between lateral load plate 7, to prevent soil sample in loading procedure
Infiltration outward.
Sliding in order to facilitate adjacent side load plate 7 and its between bottom plate, in every piece of lateral load plate 7 in three side cloth
Multiple Universal casters 14 are set, lateral load plate 7 is connected by the Universal caster 14 in top sides with Normal Constraint frame 9,
It is connect simultaneously by the Universal caster 14 in bottom sides with contacts baseplate, to reduce the friction generated when the movement of lateral load plate 7,
As shown in figure 5, the side of the Universal caster 14 also sets up backstop column 17, top surface and the Universal caster 14 of backstop column 17
Either flush, the backstop column 17 be located at close to the soil body side, realize with Normal Constraint frame, adjacent side load plate and
The close contact of bottom plate；In addition, it should be noted that lateral load plate 7 is only limitted to move in the periphery of bottom plate 2 in the horizontal direction
It is dynamic, and be not able to move on bottom porous disc 3.
As shown in figure 5, the device 6 that is directed laterally to includes limit sliding chutes 61 and limited post 62, limit sliding chutes 61 and limit
Column 62 is corresponding to be arranged in adjacent lateral load plate, ensures that excessive change cannot occur for native case by limit sliding chutes 61
Shape plays the role of limit again and can guarantee that native case is deformable, it is ensured that test the safety (sliding scale and bottom plate of limit sliding chutes 61
The peripheral range of not set bottom porous disc 3 is related on 2).
The configuration of the present invention is simple, stress are clear, safe and reliable, especially with Normal Constraint frame and normal direction load plate
Combined application can be realized the effective deformation of native case, guarantee that the right angle between plate and plate connects；Utilize lateral loading device and side
To carriage, the real-time coaxial load in horizontal direction is realized, lateral load plate can be sent out respectively with the deformation of the soil body
Unboiled water put down it is free to slide, to native case with the soil body apply horizontal loading, and using special shape sealing strip, can be in sliding process
Middle realization better seal waterproof；Based on device is directed laterally to, the finite deformation of native case is realized, it is determined that test the peace of process
Quan Xing；Universal caster is installed in lateral three side of load plate, efficiently reduces the friction between plate and plate, guarantees horizontal free
Plate frictional resistance is sufficiently small in sliding process, and native box structure system is composed using activity rigid box plate, by three directions
Apply different loads, so that rigid boxboard is moved in the axial direction realization and soil sample in cabinet is loaded, specifically in operation, use
Following manner:
Step 1: stationary work-table, secures a base plate to workbench, while bottom porous disc being placed in bottom plate；
Step 2: connecting into native box main body part by being directed laterally to device by four pieces of lateral load plates, attached drawing is seen
2, and place it on bottom plate；
Step 3: installing Slideslip device and lateral loading device in lateral load plate；
Step 4: installing water-proof sealing strip in native case, banket in native case, forms long 1.2m × wide 1.2m × high 1.0m
Test soil sample；
Step 5: native box top install Normal Constraint frame, and by Normal Constraint frame loading device to normal direction about
Beam frame applies precompression, guarantees that Normal Constraint frame is closely connect with lateral load plate；
Step 6: installation normal direction load plate, and normal direction load plate is made to pass through Normal Constraint frame, pacify in normal direction load plate
Fill normal direction load plate guiding device and normal direction loading device；
Step 7: applying non-equivalent stress in 3 directions to soil sample by lateral loading device and normal direction loading device.
The above described is only a preferred embodiment of the present invention, being not that the invention has other forms of limitations, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
It imitates embodiment and is applied to other fields, but without departing from the technical solutions of the present invention, according to the technical essence of the invention
Any simple modification, equivalent variations and remodeling to the above embodiments, still fall within the protection scope of technical solution of the present invention.
Claims (10)
1. the deformable large scale soil box structure of a kind of geotechnique's true triaxial test, for geotechnological true triaxial test large scale model examination
Test, it is characterised in that: the large scale soil box structure include workbench (1), lateral load plate (7), normal direction load plate (10) and
Bottom plate (2), four pieces of vertical lateral load plates (7) for bearing horizontal loading surround native box main body, and bottom plate (2) is fixed on workbench
(1) bottom porous disc (3) are additionally provided on and on the lower section of native box main body, bottom plate (2)；
It is connected between adjacent side load plate (7) by being directed laterally to device (6), and is also set on the lateral load plate (7)
It is equipped with the lateral loading device (4) to apply horizontal direction load；The top of native box main body is arranged in normal direction load plate (10),
The normal direction loading device (13) for applying Normal stress is provided in normal direction load plate (10)；
It is additionally provided with side-tracking skate (5) on the outside of lateral load plate (7), lateral loading device (4) is mounted on lateral sliding
On device (5), lateral loading device (4) can horizontally slip along side-tracking skate (5), to realize three axis master during loading
Stress axle center is corresponding.
2. the deformable large scale soil box structure of geotechnique's true triaxial test according to claim 1, it is characterised in that: described
The periphery of normal direction load plate (10) is additionally provided with Normal Constraint frame (9), and Normal Constraint frame (9) is located at lateral load plate (7)
Top, normal direction load plate guiding device (12) is additionally provided in normal direction load plate (10), is also set above Normal Constraint frame (9)
It is equipped with Normal Constraint frame loading device (11).
3. the deformable large scale soil box structure of geotechnique's true triaxial test according to claim 1, it is characterised in that: the method
It include guide sleeve (121) and guide rod (122) to load plate guiding device (12), guide sleeve (121) is fixed at positioned at method
To in the support plate (15) at the top of load plate (10), guide rod (122) is oriented under the action of normal direction loading device (13) along arriving
Set (121) moves up and down.
4. the deformable large scale soil box structure of geotechnique's true triaxial test according to claim 2 or 3, it is characterised in that: institute
Three sides for stating lateral load plate (7) are laid with multiple Universal casters (14).
5. the deformable large scale soil box structure of geotechnique's true triaxial test according to claim 4, it is characterised in that: the side
It include limit sliding chutes (61) and limited post (62) to guiding device (6), limit sliding chutes (61) and limited post (62) are corresponding
It is arranged in adjacent lateral load plate (7).
6. the deformable large scale soil box structure of geotechnique's true triaxial test according to claim 4, it is characterised in that: described ten thousand
It is also set up backstop column (17) to the side of ball (14), the top surface of backstop column (17) and the either flush of Universal caster (4),
The backstop column (17) is located at close to the side of the soil body.
7. the deformable large scale soil box structure of geotechnique's true triaxial test according to claim 4, it is characterised in that: the bottom
Plate (2) is equipped with the plumbing groove for being laid with cold cycling pipe (18), and bottom plate (2) is equipped with annular column, adjacent annular
Plumbing groove is formed between column, and the depth of plumbing groove is successively shoaled outward by center.
8. the deformable large scale soil box structure of geotechnique's true triaxial test according to claim 7, it is characterised in that: described cold
The top surface of heat circulation pipe (18) is arranged in the top surface of annular column, bottom lower than the top surface with annular column, bottom porous disc (3)
Porous disc (3) is flushed with bottom plate (2) outer surface.
9. the deformable large scale soil box structure of geotechnique's true triaxial test according to claim 4, it is characterised in that: the soil
Setting is additionally provided with water-proof sealing strip (8) in box main body, and the water-proof sealing strip (8) is rectangular frame structure.
10. the deformable large scale soil box structure of geotechnique's true triaxial test according to claim 4, it is characterised in that: work
Hydraulic lifting wheel (16) are additionally provided with below platform (1).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910483900.9A CN110132719A (en) | 2019-06-05 | 2019-06-05 | The geotechnological deformable large scale soil box structure of true triaxial test |
| PCT/CN2020/094392 WO2020244581A1 (en) | 2019-06-05 | 2020-06-04 | Deformable large-sized soil container structure for true triaxial testing in soil engineering |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910483900.9A CN110132719A (en) | 2019-06-05 | 2019-06-05 | The geotechnological deformable large scale soil box structure of true triaxial test |
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| CN110132719A true CN110132719A (en) | 2019-08-16 |
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| WO (1) | WO2020244581A1 (en) |
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| CN110779805A (en) * | 2019-11-21 | 2020-02-11 | 青岛理工大学 | Temperature-control large-size geotechnical true triaxial multi-field coupling test system and test method |
| CN111398024A (en) * | 2020-04-20 | 2020-07-10 | 中山大学 | True triaxial rock seepage test loading device and test system |
| CN111458214A (en) * | 2019-12-24 | 2020-07-28 | 南京理工大学 | True triaxial loading test device for large-size frozen soil |
| WO2020244581A1 (en) * | 2019-06-05 | 2020-12-10 | 青岛理工大学 | Deformable large-sized soil container structure for true triaxial testing in soil engineering |
| CN113702208A (en) * | 2021-08-26 | 2021-11-26 | 深圳大学 | Shear control instrument under three-dimensional space condition and control method thereof |
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