CN107101871A - The ess-strain control formula geotechnical centrifuge model system of complete off-load - Google Patents
The ess-strain control formula geotechnical centrifuge model system of complete off-load Download PDFInfo
- Publication number
- CN107101871A CN107101871A CN201710151263.6A CN201710151263A CN107101871A CN 107101871 A CN107101871 A CN 107101871A CN 201710151263 A CN201710151263 A CN 201710151263A CN 107101871 A CN107101871 A CN 107101871A
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- China
- Prior art keywords
- steel casing
- ess
- complete
- control formula
- geotechnical centrifuge
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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
- G01N3/02—Details
-
- 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
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
Abstract
The present invention relates to a kind of ess-strain of complete off-load control formula geotechnical centrifuge model room, vertical compression system connects oil transfer pump, and its transmission rod connects pressurization cap, and pressurization cap is placed in steel casing upper end open；The displacement transducer being connected with pressurization cap is on steel casing；Upper drainpipe becomes pipe through pressurization cap junctor：Drainage arrangement is arranged at vertical compression system bottom, and the lower drainpipe through drainage arrangement connects counter-pressure system；There is rubber cylinder pressue device steel casing inner chamber, and rubber cylinder pressue device has liquid injection hole, and liquid injection hole connects ambient pressure system by drainpipe；Vertical compression system, steel casing are fixed on base.During experiment, cylindrical specimens are put into the balancing gate pit of rubber cylinder parcel, and liquid is injected to rubber cylinder pressue device inner chamber, and liquid expansion laterally produces confined pressure to sample, and vertical compression system presses from top to sample.Each system is by computer control, simple structure of the present invention, it is easy to installs and operates, service life is long.
Description
Technical field
Formula geotechnical centrifuge model system is controlled the present invention relates to a kind of ess-strain of complete off-load.
Background technology
Triaxial compression test is a kind of native shearing strength test method of more perfect measure, compared with direct shear test
Compared with the stress state in triaxial compression test sample is relatively clearly and uniform.Strain-type triaxial apparatus is by balancing gate pit, perpendicular
To compositions such as compression system, horizontal compression system, back-pressure Force system, measuring pore water pressure systems.
There are two kinds of common triaxial compression test instrument and true triaxial compressing tester at present：
1st, common triaxial compression test instrument injects liquid formation confined pressure in balancing gate pit and is subject to simulate soil body sample
Surrounding load, but the vertical load of formed objects is also applied with the top of soil body sample simultaneously, then pass through vertical compression system
Apply vertical load.Common triaxial compression test instrument can only simulate the situation that vertical load is more than or equal to horizontal loading, simulation
Type is more single.
2nd, true triaxial compressing tester is to simulate the stress of soil body sample by being loaded on three directions.But true three
Axle compressing tester can not equally simulate the situation that vertical load is less than horizontal loading, and manufacture is complicated, and instrument is huge and precision,
Cost is high, is difficult popularization.
Two kinds of compressing testers in test record each to pressure size by sensor and pressure gauge, by constantly adding
Pressure, most soil body sample is damaged by pressure at last, and the shearing strength of soil body sample is obtained by calculating.
In deep excavation project, the soil body is in complex stress condition, and its stress-strain relation also is difficult to determine, current
The stress path of subsoil body off-load is cheated when triaxial compression test instrument is difficult simulating excavation.
The content of the invention
The purpose of the present invention is to be directed to above-mentioned present situation, it is desirable to provide it is a kind of vertical loading with laterally load be completely independent into
Under row, it is capable of the stress path of simulating excavation hole subsoil body off-load, simple structure is easy to operate, easy to control, low cost,
Service life length, be easy to maintenance complete off-load ess-strain control formula geotechnical centrifuge model system.
The implementation of the object of the invention is that the ess-strain of complete off-load controls formula geotechnical centrifuge model system, vertically
Compression system connects oil transfer pump；The transmission rod of vertical compression system connects pressurization cap, and pressurization cap is placed in the upper end open of steel casing；
Displacement transducer is fixed on steel casing, and is connected with pressurization cap；Upper drainpipe becomes pipe through pressurization cap and body and is connected：Vertically
The bottom of compression system is provided with bottom discharge device, and the lower drainpipe through bottom discharge device center is connected with counter-pressure system；
Steel casing inner chamber is provided with rubber cylinder pressue device, and rubber cylinder pressue device leaves liquid injection hole, and liquid injection hole passes through drainpipe
It is connected with ambient pressure system；Steel casing bottom connects horizontal compression system；Vertical compression system is fixed on base by pillar
On, steel casing bottom is fixed on base.
Rubber cylinder pressue device is first taken out during experiment from steel casing.Cylindrical specimens are put into rubber cylinder pressurization
In device, steel casing and fixation are put.It is right by controlling horizontal compression system to inject liquid into rubber cylinder pressue device
Cylindrical specimens laterally press, then apply vertical pressure by vertical compression system.Vertically, laterally pressure is not interfere with each other.Close
The draining valve of top, in the case of not draining, after vertical compression system applies vertical pressure, control counter-pressure system applies anti-
To pressure, the pressure gauge reading of connection counter-pressure system is forced to remain constant, the buffer brake that counter-pressure system applies is sample
In pore water pressure.For saturated sample, the draining tube valve of connection above balancing gate pit is opened, vertical compression system is carried out axially
While pressurization, the displacement that body becomes in pipe is cylindrical specimens Volume Changes.
Pass through the horizontal compression system for controlling to be connected at rubber cylinder pressue device liquid injection hole, Ke Yijing in process of the test
Confined pressure (the i.e. σ of true control cylindrical specimens2And σ3).Due to horizontal pressurization, vertical not interfereing with each other property of pressurization, vertical pressurization dress
Putting can control to produce any vertical load being more than equal to or less than confined pressure, experiment is simulated common triaxial compressions
The situation that test instrument can not be simulated.
The beneficial effects of the invention are as follows：
Can be individually to confined pressure (σ when the 1st, testing2And σ3) and vertical load (σ1) be controlled, between the two not by phase
Mutually interference；
2nd, the vertical load that can simulate common triaxial compression test instrument can not simulate is less than confined pressure (i.e. σ1＜ σ2=σ3)
Situation；
3rd, vertical compression system and displacement transducer are by computer control；Vertical compression system is controlled during experiment to cylinder
Sample applies certain axial compressive force, and simultaneous computer reading obtains displacement transducer and produces corresponding deflection, i.e. cylinder
The compressive deformation that sample is produced by axial compressive force, so as to realize the ess-strain control of the present invention；
4th, it is simple in construction, it is easy to install and operate, low cost, complicated machinery connector is few, service life length, be easy to dimension
Repair.
Brief description of the drawings
Fig. 1 is schematic structural view of the invention,
Fig. 2 is base connection figure of the present invention,
Fig. 3 is that steel casing is connected side view with base.
Embodiment
The present invention is described in detail with reference to the accompanying drawings.
Reference picture 1,2,3, vertical compression system 14 connects oil transfer pump, and the transmission rod of vertical compression system connects pressurization cap 3, vertically
The vertical pressure of compression system is provided by oil pump, and rubber cylinder pressurization dress is opposite to by the output pressure of computer control oil pump
Sample in putting vertically is pressurizeed.Pressurization cap is placed in the upper end open 2 of steel casing 4, and the surrounding of pressurization cap scribbles all scholars
Woods, can be vertically slidable in upper end open.Displacement transducer 1 is fixed on steel casing, and is connected with pressurization cap.
The thickness of steel casing 4 5mm, internal diameter 101.1mm, external diameter 111.1mm, high 157mm.Steel casing upper end open 2
Thick 5mm, internal diameter 39.1mm, external diameter 49.1mm, high 40mm.Steel casing is made up of high-quality steel.The transparent organic glass pressurization
Cap 3 diameter 39.1mm, high 30mm.
Upper drainpipe 10 becomes pipe 12 through transparent organic glass pressurization cap and body and is connected, and has draining valve on upper drainpipe.With
To measure Volume Changes of the saturation soil sample in pressure process.The bottom of vertical compression system is provided with bottom discharge device 8, passes through
The lower drainpipe 9 at bottom discharge device center is connected with counter-pressure system 13.
Bottom discharge device 8 diameter 39.1mm, thick 30mm, the upper and lower a diameter of 5mm of drainpipe.
Connect steel casing inner chamber 6 and be provided with rubber cylinder pressue device 5, the high 152mm of rubber cylinder pressue device cylinder, wall
Thick 3mm, inner chamber thickness 25mm.The rubber of rubber cylinder pressue device uses water-fast corrosion-resistant, the good elastomeric material of elastic deformability.
Rubber cylinder pressue device leaves the liquid injection hole for arranging water pipe 7, and liquid injection hole aperture is 10mm.Liquid injection hole uses high strength steel spiral shell
Line mouth is connected by drainpipe with ambient pressure system 19, and draining valve and pressure gauge are housed on drainpipe, fluid injection can be controlled
Turnover and the size of inwall confined pressure can be recorded.
Steel casing bottom connects horizontal compression system 11.Vertical compression system is fixed on base 18 by pillar 17, steel
Casing bottom processed is fixed on base.
Steel casing bottom fixing end diameter 171.1mm, bottom fixing end has the bolt hole of six circle distributions, bolt hole
Internal diameter 10mm, the bolt hole hole heart is away from fixing end edge 15mm.Base 18 long 240mm, wide 200mm, height 80mm, by high-quality steel
Into.
Before present invention experiment, first take out in steel casing, take one piece of diameter 39.1mm, height 120mm cylinder examination
End section above and below layer of plastic film, cylindrical specimens, which is put, outside sample, cylindrical specimens places filter paper and permeable stone 15.Put
In the inner chamber for entering rubber cylinder pressue device 5, steel casing is put, is fixed to bolt 16 on base.Open on drainpipe 7
Draining valve, liquid is injected to rubber cylinder pressue device inner chamber, and expansion is produced with the injection rubber cylinder pressue device of liquid
So as to extrude the cylindrical specimens of inner chamber.Because steel casing inwall and rubber cylinder pressue device outer wall are closely coupled, so that
The liquid of injection around internal cylindrical specimens only to producing crimp, and the pressure gauge connected by horizontal compression system is recorded
The confined pressure that soil sample is subject to.Then vertical compression system is controlled to apply axial compressive force σ to cylindrical specimens1.Cylindrical specimens are perpendicular
To deformation is produced, simultaneous displacement sensor is by the displacement readings of record pressurization cap, and as cylindrical specimens are by axial compressive force
σ1The compressed shape variable of generation.Pressure is filled at pressure and rubber cylinder pressue device liquid injection hole by controlling injection liquid
The reading of table, can be accurately controlled confined pressure (the i.e. σ of cylindrical specimens2And σ3), obtain testing desired quantity.
Simultaneously because vertical compression system only produces vertical pressure to cylindrical specimens cross section, and rubber column is not disturbed
Body pressue device around cylindrical specimens to being pressurizeed, and vertical loading and laterally loading each independent progress are not interfere with each other.It is vertical to add
Pressure device can control to produce any vertical load being more than equal to or less than confined pressure, experiment is simulated excavation of foundation pit
When cheat subsoil body off-load stress path.
In the case of not draining, the pore water pressure in cylindrical specimens is such as determined, can be closed on drainpipe 10
Draining valve, after vertical compression system apply vertical pressure after, control counter-pressure system 13 apply buffer brake, force connection back-pressure
The pressure gauge reading of system remains constant, and the buffer brake that counter-pressure system applies is the pore water pressure in cylindrical specimens
Power.For saturation cylindrical specimens, open above rubber cylinder pressue device inner chamber, the draining valve on upper drainpipe is erected
While carrying out axial pressure to compression system, the displacement that body becomes in pipe is cylindrical specimens Volume Changes.
The present invention combines both displacement transducer and vertical loading system and worked simultaneously, passes through computer control, forms one
Plant the ess-strain control formula geotechnical centrifuge model system of complete off-load.
The present invention can be completely independent under progress in vertical loading with laterally loading, can simulating excavation hole subsoil body unload
The stress path of lotus, simple structure is easy to operate, easy to control, low cost, service life length, be easy to maintenance.
Claims (10)
1. the ess-strain control formula geotechnical centrifuge model system of complete off-load, it is characterised in that：Vertical compression system connects oil transportation
Pump；The transmission rod of vertical compression system connects pressurization cap, and pressurization cap is placed in the upper end open of steel casing；Displacement transducer is fixed
It is connected on steel casing, and with pressurization cap；Upper drainpipe becomes pipe through pressurization cap and body and is connected：The bottom of vertical compression system
Provided with bottom discharge device, the lower drainpipe through bottom discharge device center is connected with counter-pressure system；Steel casing inner chamber is set
There is rubber cylinder pressue device, rubber cylinder pressue device leaves liquid injection hole, and liquid injection hole passes through drainpipe and ambient pressure system
Connection；Steel casing bottom connects horizontal compression system；Vertical compression system is fixed on base by pillar, steel casing bottom
It is fixed on base.
2. the ess-strain control formula geotechnical centrifuge model system of complete off-load according to claim 1, it is characterised in that：
Pressurization cap is placed in the upper end open of steel casing, and the surrounding of pressurization cap scribbles vaseline.
3. the ess-strain control formula geotechnical centrifuge model system of complete off-load according to claim 1, it is characterised in that：
The steel casing thickness 5mm, internal diameter 101.1mm, external diameter 111.1mm, high 157mm；Steel casing upper end open thickness 5mm, internal diameter
39.1mm, external diameter 49.1mm, high 40mm.
4. the ess-strain control formula geotechnical centrifuge model system of complete off-load according to claim 1, it is characterised in that：
Transparent organic glass pressurization cap diameter 39.1mm, high 30mm.
5. the ess-strain control formula geotechnical centrifuge model system of complete off-load according to claim 1, it is characterised in that：
Bottom discharge assembly dia 39.1mm, thick 30mm；The upper and lower a diameter of 5mm of drainpipe.
6. the ess-strain control formula geotechnical centrifuge model system of complete off-load according to claim 1, it is characterised in that：
Rubber cylinder pressue device cylinder high 157mm, wall thickness 3mm, inner chamber thickness 25mm.
7. the ess-strain control formula geotechnical centrifuge model system of complete off-load according to claim 1, it is characterised in that：
Rubber cylinder pressue device stays liquid injection hole aperture to be equipped with row on 10mm, the drainpipe that liquid injection hole is connected with ambient pressure system
Water valve and pressure gauge.
8. the ess-strain control formula geotechnical centrifuge model system of complete off-load according to claim 1, it is characterised in that：
Steel casing bottom fixing end diameter 171.1mm, bottom fixing end has the bolt hole of six circle distributions, bolt hole internal diameter
10mm, the bolt hole hole heart is away from fixing end edge 15mm.
9. the ess-strain control formula geotechnical centrifuge model system of complete off-load according to claim 1, it is characterised in that：
Base long 240mm, wide 200mm, height 80mm.
10. the ess-strain control formula geotechnical centrifuge model system of complete off-load according to claim 1, its feature exists
In：The rubber of rubber cylinder pressue device uses water-fast corrosion-resistant, the good elastomeric material of elastic deformability.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710151263.6A CN107101871A (en) | 2017-03-14 | 2017-03-14 | The ess-strain control formula geotechnical centrifuge model system of complete off-load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710151263.6A CN107101871A (en) | 2017-03-14 | 2017-03-14 | The ess-strain control formula geotechnical centrifuge model system of complete off-load |
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| Publication Number | Publication Date |
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| CN107101871A true CN107101871A (en) | 2017-08-29 |
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ID=59675628
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710151263.6A Pending CN107101871A (en) | 2017-03-14 | 2017-03-14 | The ess-strain control formula geotechnical centrifuge model system of complete off-load |
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Cited By (3)
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|---|---|---|---|---|
| CN109520835A (en) * | 2018-12-11 | 2019-03-26 | 佛山科学技术学院 | A kind of soil body triaxial stress path pilot system and control method |
| CN109596814A (en) * | 2019-01-10 | 2019-04-09 | 中山大学 | The layer of sand three-dimensional grouting test device and its test method of analog actual condition |
| CN116735378A (en) * | 2023-05-29 | 2023-09-12 | 广州建筑股份有限公司 | Device and method for testing along-drilling follow pipe pile side grouting shear model |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109520835A (en) * | 2018-12-11 | 2019-03-26 | 佛山科学技术学院 | A kind of soil body triaxial stress path pilot system and control method |
| CN109596814A (en) * | 2019-01-10 | 2019-04-09 | 中山大学 | The layer of sand three-dimensional grouting test device and its test method of analog actual condition |
| CN116735378A (en) * | 2023-05-29 | 2023-09-12 | 广州建筑股份有限公司 | Device and method for testing along-drilling follow pipe pile side grouting shear model |
| CN116735378B (en) * | 2023-05-29 | 2024-04-16 | 广州建筑股份有限公司 | Device and method for testing along-drilling follow pipe pile side grouting shear model |
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Application publication date: 20170829 |