CN204314138U - A kind of True Triaxial Apparatus intermediate principal stress bringing device - Google Patents
A kind of True Triaxial Apparatus intermediate principal stress bringing device Download PDFInfo
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- CN204314138U CN204314138U CN201420849254.6U CN201420849254U CN204314138U CN 204314138 U CN204314138 U CN 204314138U CN 201420849254 U CN201420849254 U CN 201420849254U CN 204314138 U CN204314138 U CN 204314138U
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- increased pressure
- pressure board
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- intermediate principal
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Abstract
The utility model discloses a kind of True Triaxial Apparatus intermediate principal stress bringing device, comprise two bases being separately positioned on sample both sides; Described two bases are equipped with and move horizontally on described base and can the flexible loading unit of in the vertical direction; Contact with pressue device outside the loading unit of described sample wherein side; Contact with counter-force support outside the loading unit of the other side of described sample, described counter-force support is provided with strain gauge.The independence that the utility model achieves true triaxial intermediate principal stress applies, when solving existing employing increased pressure board superimposed applying intermediate principal stress, the excessive and soil body of friction force gets into the problem that gap causes test error excessive simultaneously, under further analyzing three-dimensional stress state, soil body mechanical characteristic creates test condition.
Description
Technical field
The utility model relates to a kind of True Triaxial Apparatus intermediate principal stress bringing device.
Background technology
At present, the various true triaxil testers tested for the indoor soil body can be classified as two large classes substantially.First kind true triaxil tester three principle stress non-fully apply independently, large, intermediate principal stress
σ 1,
σ 2in minor principal stress
σ 3basis on apply deviatoric stress respectively
σ 1-
σ 3,
σ 2-
σ 3obtain, this type of true triaxil tester be difficult to carry out as etc.
pdeng
qtest etc. particular stress path.
Equations of The Second Kind true triaxil tester completely independently can apply three principle stresses.The large, medium and small principle stress of this kind of true triaxil tester can free rotation between three directions, therefore can carry out various stress path tests easily.Shortcoming be these quasi-instrument three directions compression system between all easily mutually interference.
Equations of The Second Kind instrument intermediate principal stress pressuring method mainly contains the pressurization of rigid pressurized plate and flexible rubber membrane pressurizes two kinds.Flexible rubber membrane is adopted to pressurize, although can overcome the problem that three directions are disturbed mutually, often there is the problems such as the uneven and applied pressure level of pressurized plane pressure distribution is limited, pressure is excessive, rubber membrane may destroy, especially all the more so for coarse-grained soil.Although and adopt rigid plate to pressurize can to solve the problem that pressure distribution is uneven, applied pressure level is limited, because rigid plate lacks compatibility of deformation, often occur between compression system the problem of interference mutually.
Thus, have researcher to propose to adopt rigid pressurized plate and flexible filler successively alternate superimposed method solve the mutual problem disturbed in loading procedure, achieve some effects.But new problem has been come, first, in process of the test, because flexible filler rigidity is very little, under axial, the part soil body is got in increased pressure board space, form rough surface in contact, increase friction force between sample and increased pressure board on the one hand, hinder the development of sample axial deformation on the other hand, cause test findings distortion; Secondly, because increased pressure board and filling material stiffness difference are very large, the surface of contact staggered with forming soft or hard during sample contacts, forms very complicated stress field near specimen surface, is difficult to assessment, is unfavorable for test result analysis and utilization to the impact of test findings.
Summary of the invention
Technical problem to be solved in the utility model is, for above-mentioned the deficiencies in the prior art, provides a kind of True Triaxial Apparatus intermediate principal stress bringing device.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of True Triaxial Apparatus intermediate principal stress bringing device, comprises two bases being separately positioned on sample both sides; Described two bases are equipped with and move horizontally on described base and can the flexible loading unit of in the vertical direction; Contact with pressue device outside the loading unit of described sample wherein side; Contact with counter-force support outside the loading unit of the other side of described sample, described counter-force support is provided with strain gauge.
The top of described two loading units all contacts with the axial pressure support that can move horizontally on described loading unit; Described sample top contacts with bearing plate; Described bearing plate contacts with the transmitting axle force bar bottom vertically arranged; Described transmitting axle force masthead end is fixedly connected with described axial pressure support.Ensure that axial deformation and the vertical deformation of intermediate principal stress charger of sample in axial pressure process are harmonious.
Described base comprises guide rail and to be arranged on described guide rail and multiple bearings that can rotate on described guide rail; This understructure is simple, easy to make.
Described loading unit comprises lower increased pressure board and the upper increased pressure board parallel with described lower increased pressure board; Multiple intermediary press plate is arranged with in parallel between described lower increased pressure board and upper increased pressure board; Between described lower increased pressure board and intermediary press plate, between adjacent intermediary press plate, between described upper increased pressure board and intermediary press plate, be equipped with elastic rubber tube; Described lower increased pressure board lower surface and described sample bottom surface are in same level; Described lower increased pressure board lower surface and described bearing touch; Described upper increased pressure board, multiple intermediary press plate all offer at least one through hole, and the column vertically arranged passes described upper increased pressure board and multiple intermediary press plate from described through hole, and described column bottom is fixedly connected with described lower increased pressure board; Described column cross-section diameter is less than described through hole basal diameter.This loading unit level to, vertically to being all free to slide, independently can apply intermediate principal stress arbitrarily in sample side, draw its stress value by the principle of reaction at opposite side.Hole size is slightly larger than the diameter of column, so that upper increased pressure board, intermediary press plate can freely up and down move.
Described lower increased pressure board, upper increased pressure board near the side of described sample respectively with under contact baffle plate, upper contact baffle plate is fixedly connected with, and described lower contact baffle plate top with described on contact and to contact bottom baffle plate and can in the vertical direction relative sliding.When lower contact baffle plate, upper contact baffle plate overcome test, the excessive and soil body of friction force clamp-ons the problem of intermediary press plate.
Described lower increased pressure board and upper increased pressure board all offer L connected in star near the side of described sample; Described lower contact baffle plate bottom, upper contact baffle plate top are equipped with the tenon with described matching grooves; Described tenon is engaged in described groove.Being connected firmly of groove and tenon, anti-baffle plate loosens.
Compared with prior art, the beneficial effect that the utility model has is: the independence that the utility model achieves true triaxial intermediate principal stress applies, when solving existing employing increased pressure board superimposed applying intermediate principal stress, the excessive and soil body of friction force gets into the problem that gap causes test error excessive simultaneously, under further analyzing three-dimensional stress state, soil body mechanical characteristic is laid a good foundation.
Accompanying drawing explanation
Fig. 1 is the utility model one embodiment intermediate principal stress pressue device schematic diagram;
Fig. 2 is lower increased pressure board organigram;
Fig. 3 is intermediary press plate organigram;
Fig. 4 is upper increased pressure board organigram;
Fig. 5 is contact shutter configuration schematic diagram.
Embodiment
As shown in Figure 1-Figure 3, the utility model one embodiment comprises guide rail 2 and to be arranged on described guide rail 2 and multiple bearings 3 that can rotate on described guide rail 2; Loading unit comprises lower increased pressure board 5 and the upper increased pressure board 8 parallel with described lower increased pressure board 5; Multiple intermediary press plate 7 is arranged with in parallel between described lower increased pressure board 5 and upper increased pressure board 8; Between described lower increased pressure board 5 and intermediary press plate 7, between adjacent intermediary press plate 7, between described upper increased pressure board 8 and intermediary press plate 7, be equipped with elastic rubber tube 6; Described lower increased pressure board 5 lower surface and described sample 25 bottom surface are in same level; Described lower increased pressure board 5 lower surface contacts with described bearing 3; Described upper increased pressure board 8, multiple intermediary press plate 7 all offer at least one through hole 12, and the column 9 vertically arranged passes described upper increased pressure board 8 and multiple intermediary press plate 7 from described through hole 12, and described column 9 bottom is fixedly connected with described lower increased pressure board 5; Described column 9 cross-sectional diameter is less than described through hole 12 basal diameter; Axial pressure support 19 is contacted with described upper increased pressure board 8 by roller bearing 20; Lower increased pressure board 5, upper increased pressure board 8 near the side of described sample 25 respectively with under contact baffle plate 14, upper contact baffle plate 16 is fixedly connected with, and described lower contact baffle plate 14 top with described on contact and to contact bottom baffle plate 16 and can in the vertical direction relative sliding.
Lower increased pressure board 5 and upper increased pressure board 8 all offer L connected in star 11 near the side of described sample 25; Described lower contact baffle plate 14 bottom, upper contact baffle plate 16 top are equipped with the tenon 13 mated with described groove 11; Described tenon 13 is engaged in described groove 11.
The top of column 9 is provided with nut 10, can prevent increased pressure board 8 from loosening.
The desirable 4mm-6mm of thickness of every sheet intermediary press plate, width and specimen width are consistent, and current true triaxial test adopts cuboid sample usually, and the width of intermediate principal stress loading surface is generally at 30mm-60mm.Be fixed on the desirable 3mm-5mm of diameter of the column 9 on lower increased pressure board 5, highly depend primarily on the height of sample, general desirable 70mm-150mm, adopt elasticity small rubber hose to lay between increased pressure board, elasticity small rubber hose is generally hollow tubular, external diameter 2mm-4mm.Be opened in the desirable 3mm-5mm of the degree of depth of the groove 11 on increased pressure board, lower increased pressure board, highly desirable 2mm-4mm; Upper contact baffle plate 14, lower contact baffle plate 16 adopt high strength thin aluminum sheet, thickness 0.5mm-1mm, highly materials height about 2/3-3/4, in guarantee, contact baffle plate 14, lower contact baffle plate 16 have certain lap of splice, carry out polishing scrape to reduce its frictional resistance during test to baffle surface.
First sample 25 is installed during test, next the assembling of lower increased pressure board 5, elastic rubber tube 6, intermediary press plate 7, upper increased pressure board 8 successively lamination is formed increased pressure board assembly, and tightening nuts 10, then install contacting baffle plate up and down successively, lower contact baffle plate 14 is first installed during installation, then installs contact baffle plate 16.Finally pressue device is pushed away nearly specimen surface, contact baffle plate is up and down allowed fully to contact with specimen surface, and ensure that sample bottom surface and lower increased pressure board bottom surface are in same level, then provide intermediate principal stress by hydraulic pressurization piston 18(), counter-force support 23, strain gauge 24 be in place.Intermediate principal stress pressue device and installation.
For the axial deformation and the vertical deformation of intermediate principal stress charger that ensure sample in axial pressure process are harmonious, the axial pressure support 19 of band roller bearing 20 is fixed on transmitting axle force bar 21, power is passed on intermediate principal stress charger by upper increased pressure board 8 by roller bearing 20 by axial pressure support 19, makes it synchronously produce vertical deformation.
Lower contact baffle plate 14 is inserted in the groove 11 of lower increased pressure board 5 by tenon 13.Lower increased pressure board 5 lays elastic rubber tube 6, makes its marshalling even, then intermediary press plate 7 is passed column 9 by the through hole 12 pre-set, be placed on the elastic rubber tube 6 of laying, ensure that intermediary press plate 7 freely up and down can move along column 9.Upper increased pressure board 8 upper surface and sample end face maintain an equal level, and twist good nut 10, then in the middle of the groove 11 upper contact baffle plate 16 being inserted into upper increased pressure board 8 by tenon 13.When combining increased pressure board pressurized or resilience, upper and lower contact baffle plate can the freely up and down changing of the relative positions, ensures that upper and lower contact baffle plate, increased pressure board assembly and sample 25 keep deform in same pace.After the installation of increased pressure board assembly, push away nearly sample 25, upper and lower contact baffle plate is allowed fully to contact with specimen surface, then intermediate principal stress pressurizing piston 18, counter-force support 23, strain gauge 24 are installed, next the pressurized equipment of minor principal stress is installed, finally, install bearing plate 22, transmitting axle force bar 21, axial pressure support 19 is placed on loading unit, make its roller bearing 20 just with the surface contact of upper increased pressure board 8.
During test, independently apply the principle stress in three directions successively by testing program.When applying axial stress (large principle stress), transmission rod 21 drives axial pressure support 19 to be out of shape together, power passed on increased pressure board assembly by roller bearing 20, make its deform in same pace, contact baffle plate also produces the upper and lower changing of the relative positions to coordinate vertical distortion simultaneously; When applying intermediate principal stress, moved right by pressurizing piston 18 driving pressure device in left side, record stress by the strain gauge 24 of opposite side.In process of the test, loading unit all the time can horizontally, vertically to moving freely, have good compatibility of deformation.
Claims (7)
1. a True Triaxial Apparatus intermediate principal stress bringing device, is characterized in that, comprises two bases (1) being separately positioned on sample (25) both sides; Described two bases (1) are equipped with and move horizontally on described base (1) and can the flexible loading unit of in the vertical direction; Contact with pressue device outside the loading unit of described sample (25) wherein side; Contact with counter-force support (23) outside the loading unit of the other side of described sample (25), described counter-force support (23) is provided with strain gauge (24).
2. True Triaxial Apparatus intermediate principal stress bringing device according to claim 1, is characterized in that, the top of described two loading units all contacts with the axial pressure support (19) that can move horizontally on described loading unit; Described sample (25) top contacts with bearing plate (22); Described bearing plate (22) contacts with transmitting axle force bar (21) bottom vertically arranged; Described transmitting axle force bar (21) top is fixedly connected with described axial pressure support (19).
3. True Triaxial Apparatus intermediate principal stress bringing device according to claim 2, is characterized in that, described base (1) comprises guide rail (2) and is arranged on described guide rail (2) to be gone up and multiple bearings (3) that above can rotate at described guide rail (2).
4. True Triaxial Apparatus intermediate principal stress bringing device according to claim 3, is characterized in that, described loading unit comprises lower increased pressure board (5) and the upper increased pressure board (8) parallel with described lower increased pressure board (5); Multiple intermediary press plate (7) is arranged with in parallel between described lower increased pressure board (5) and upper increased pressure board (8); Between described lower increased pressure board (5) and intermediary press plate (7), between adjacent intermediary press plate (7), between described upper increased pressure board (8) and intermediary press plate (7), be equipped with elastic rubber tube (6); Described lower increased pressure board (5) lower surface and described sample (25) bottom surface are in same level; Described lower increased pressure board (5) lower surface contacts with described bearing (3); Described upper increased pressure board (8), multiple intermediary press plate (7) all offer at least one through hole (12), the column (9) of vertical setting is from described through hole (12) through described upper increased pressure board (8) and multiple intermediary press plate (7), and described column (9) bottom is fixedly connected with described lower increased pressure board (5); Described column (9) cross-sectional diameter is less than described through hole (12) basal diameter.
5. True Triaxial Apparatus intermediate principal stress bringing device according to claim 4, is characterized in that, described axial pressure support (19) is contacted with described upper increased pressure board (8) by roller bearing (20).
6. True Triaxial Apparatus intermediate principal stress bringing device according to claim 5, it is characterized in that, described lower increased pressure board (5), upper increased pressure board (8) near the side of described sample (25) respectively with under contact baffle plate (14), upper contact baffle plate (16) is fixedly connected with, and described lower contact baffle plate (14) top with described on contact baffle plate (16) bottom and contact and energy in the vertical direction relative sliding.
7. True Triaxial Apparatus intermediate principal stress bringing device according to claim 6, is characterized in that, described lower increased pressure board (5) and upper increased pressure board (8) all offer L connected in star (11) near the side of described sample (25); Described lower contact baffle plate (14) bottom, upper contact baffle plate (16) top are equipped with the tenon (13) mated with described groove (11) shape size; Described tenon (13) is engaged in described groove (11).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420849254.6U CN204314138U (en) | 2014-12-29 | 2014-12-29 | A kind of True Triaxial Apparatus intermediate principal stress bringing device |
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|---|---|---|---|
| CN201420849254.6U CN204314138U (en) | 2014-12-29 | 2014-12-29 | A kind of True Triaxial Apparatus intermediate principal stress bringing device |
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| CN204314138U true CN204314138U (en) | 2015-05-06 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458409A (en) * | 2014-12-29 | 2015-03-25 | 中国电建集团中南勘测设计研究院有限公司 | Main stress application device for true triaxial apparatus |
| CN106680092A (en) * | 2017-01-22 | 2017-05-17 | 中国电建集团华东勘测设计研究院有限公司 | Vacuum negative pressure-based device for measuring strength and deformation characteristics of coarse-grained soil |
| CN108303326A (en) * | 2018-01-26 | 2018-07-20 | 西南石油大学 | A kind of rock true three-axial compression test apparatus |
-
2014
- 2014-12-29 CN CN201420849254.6U patent/CN204314138U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104458409A (en) * | 2014-12-29 | 2015-03-25 | 中国电建集团中南勘测设计研究院有限公司 | Main stress application device for true triaxial apparatus |
| CN106680092A (en) * | 2017-01-22 | 2017-05-17 | 中国电建集团华东勘测设计研究院有限公司 | Vacuum negative pressure-based device for measuring strength and deformation characteristics of coarse-grained soil |
| CN106680092B (en) * | 2017-01-22 | 2023-06-13 | 中国电建集团华东勘测设计研究院有限公司 | Coarse-grained soil strength and deformation characteristic measuring device based on vacuum negative pressure |
| CN108303326A (en) * | 2018-01-26 | 2018-07-20 | 西南石油大学 | A kind of rock true three-axial compression test apparatus |
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