CN104297066B - Static soil pressure testing device and method for gradient microstructure soil - Google Patents
Static soil pressure testing device and method for gradient microstructure soil Download PDFInfo
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- CN104297066B CN104297066B CN201410468902.8A CN201410468902A CN104297066B CN 104297066 B CN104297066 B CN 104297066B CN 201410468902 A CN201410468902 A CN 201410468902A CN 104297066 B CN104297066 B CN 104297066B
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Abstract
A kind of gradient microstructure soil earth pressure at rest experimental rig and method, belong to earth pressure at rest experimental rig and method. The device is by the flanged (FLGD) composable mold in two sides, elastic film layer, lubricant layer composition. Composable mold four sides middle position is equipped with hydraulic cavities, and liquid is contacted by round hole with elastic film layer in hydraulic cavities; Resistance strain gage is posted in round hole range elasticity film layer interior and exterior; Lubricant layer is sealed around round hole by 〇 shape sealing ring and fastening bolt and composable mold. Test in two stages with earth pressure at rest experimental stage. Composable mold is removed after Frozen-thawed cycled, and sample is rotated on perpendicular
After reconfigure mold carry out consolidate compression test. Realize that resistance strain gage reading is zero by fluid pressure in control hydraulic cavities, to guarantee sample lateral confinement state, at this time in hydraulic cavities fluid pressure be soil sample earth pressure at rest. This method fully meets the requirement of gradient microstructure soil earth pressure at rest and its anisotropy test.
Description
Technical field
The present invention relates to a kind of earth pressure at rest assay device and method, the static soil of especially a kind of gradient microstructure soil
Pressure experimental device and method
Background technology
Manual pipe jacking is important sinking shaft side in China's central and east special thick alluvium and western Cretaceous System Jurassic stratum
Method.After the completion of freezing, frost wall by naturally to thaw or accelerates defrosting to become artificial freeze-thaw cycle medium.In frost wall, temperature field leads to
It is often uneven, be made up of several dynamic temperature step, the temperature ladder particularly in frost wall in individual pen pipe freezing process
Degree will be more significant.Freezing is the process of hydro-thermal power THM coupling, this process can change in rock soil medium granule arrangement mode and
Adhesive form, and promote its original pore structure to change.Freeze-thaw cycle will lead to structural appearance in sample, and warm
Degree gradient freeze-thaw cycle while then microstructure occurs in leading to sample, induces the Gradient Features of its structure.This temperature
The gradient-structure of degree gradient freeze-thaw cycle induction is different from the Initial Gradient structure being affected by depositional environment and deposition stress, the latter
It is parallel to pit shaft buried depth direction more, be not involved in the performance that horizontal loading is soil pressure.
Existing research with regard to earth pressure at rest focuses mostly in sample cell yardstick, and the earth pressure theory set up is set up even
In continuous mechanics theoretical basiss, seldom consider that the many granule mediums of rock soil medium and its presence of microstructure gradient are sent out to soil pressure
The dynamic effect waved and develop.Assay device used also more is based on rigid pressure room-flexible sides condition and rigid pressure room-rigidity
Two kinds of lateral spacing condition it is difficult to accurately obtain horizontal stationary soil pressure, thus bring (horizontal soil pressure loaded errors cannot quantify
Assessment.
Gradient microstructure soil earth pressure at rest test method belongs to across yardstick test method, between original position physical modeling examination
Test between structure dimension and single test test-material yardstick, the method has important academic valency for perfect across yardstick test
Value.
Content of the invention
It is an object of the invention to provide a kind of simple to operate, flexible form, function is advanced, and disclosure satisfy that gradient microcosmic
Structured soil earth pressure at rest native earth pressure at rest assay device and method with a kind of gradient microstructure of its anisotropy test.
The object of the present invention is achieved like this: gradient microstructure soil earth pressure at rest assay device includes: both sides band
The assembling die of adpting flange, elastic film layer, lubricating layer；Assembling die side centre position is provided with hydraulic cavities, in hydraulic cavities
Liquid is contacted with elastic film layer by circular port；Being pasted with resistance in elastic film layer interior outside in circular port diameter range should
Become piece；Lubricating layer is tightly connected with assembling die by shape sealing ring and fastening bolt around circular port.
Described assembling die is made up of two halves docking, is connected by fastening bolt at adpting flange；Assembling die is
Square shape, four sides centre position is equipped with hydraulic cavities, can obtain static in the orthogonal both direction of sample
Soil pressure.
In described elastic film layer, the resistance-strain chip size of external pasting, model are identical with arrangement；Work as bullet
Property thin film stress occur bending and deformation after drive resistance strain gage occur stretcher strain；The diameter reduced resistance foil gauge of circular port
Length=2 ~ 5mm.
The thickness of described hydraulic cavities is equal with the wall thickness of assembling die.
Gradient microstructure soil earth pressure at rest test method: gradient microstructure soil earth pressure at rest assay device is along wall
Thick direction is followed successively by that assembling die layer is supporting course, elastic film layer is measurement layer and lubricating layer drops frictional layer from outside to inside,
There is Initial Gradient microstructure preparation and the dual-use function of subsequent stationary soil pressure anisotropy test；By dynamic control liquid
In pressure chamber, fluid pressure realizes resistance strain gage reading is zero, i.e. the meansigma methodss of elastic film interior outside resistance strain gage difference of reading
Be zero it is ensured that sample be in strict lateral spacing state be lateral deformation be zero, now in hydraulic cavities fluid pressure be sample quiet
Only soil pressure；
Test in two stages:
A. freeze-thaw cycle preparation structure gradient sample: sample is put in assembling die, configures system in sample upper and lower ends
Cold drawing, realizes gradient microcosmic knot on thermograde direction for the sample by adjusting freeze-thaw cycle temperature and freezing-thawing cycles
Structure；
B. earth pressure at rest experimental stage.After freeze-thaw cycle, assembling die and cold plate are removed, and by sample vertical
Rotate in planeAgain put in assembling die afterwards, configure porous disc in sample upper and lower ends, carry out consolidate compression test.
Beneficial effect:
1. the assay device of the present invention prepares gradient microstructure soil by freeze-thaw cycle, and gained sample can vertically put down
Rotate on faceAfter carry out consolidate compression test and survived the winter supporting in foundation ditch with simulating soil pressure and Frozen Area after freezing shaft wall
Soil pressure condition after structure is it is also possible to keep not rotating and directly carrying out consolidate compression test, thus simulating Frozen Area season
Section mobile layer soil soil pressure condition；
2. the method that in apparatus of the present invention, elastic film+resistance strain gage jointly controls soil sample radial deformation, achievable quilt
The condition of test sample lateral spacing, overcomes error present in traditional soil pressure cell itself measurement soil pressure process, and that is, rigidity is coordinated
With deformation measurement error, it is applicable not only to higher consolidation pressure, also applicable conventional load, test pressure scope is more wide in range；
3. the gradient microstructure soil earth pressure at rest assay device of the present invention and method not only can carry out freeze thawing induction
Microstructure gradient soil earth pressure at rest test, also can carry out the initial microcosmic being affected by natural sediment environment and deposition stress
The earth pressure at rest of structure gradient soil and anisotropy are tested.
4. the gradient microstructure soil earth pressure at rest assay device of the present invention, can apply to fix on assembling die
Constraint, also can apply all kinds of loads on sample, thus completing the freeze-thaw cycle examination under Complex Temperature, load and environmental pattern
Test, to simulate the freezing engineering boundary condition of reality.
Brief description
Fig. 1 is assembling die integral planar schematic diagram of the present invention.
Fig. 2 is lubricating layer plane graph of the present invention.
Fig. 3 is elastic film plane graph of the present invention.
Fig. 4 is invention cold plate plane graph.
Fig. 5 is porous disc plane graph of the present invention.
In figure, 1, assembling die；2nd, elastic film layer；3rd, lubricating layer；4th, hydraulic cavities；5th, circular port；6th, resistance strain gage；
7th, shape sealing ring；8th, fastening bolt；9th, adpting flange；11st, cold plate；12nd, porous disc.
Specific embodiment:
The invention will be further described below in conjunction with the accompanying drawings:
Gradient microstructure soil earth pressure at rest assay device includes: the assembling die 1 with adpting flange 9 for the both sides, elasticity
Thin layer 2 and lubricating layer 3；Assembling die 1 side centre position is provided with hydraulic cavities 4, and in hydraulic cavities, liquid passes through circular port 5 and bullet
Property thin layer 2 contacts；It is pasted with resistance strain gage 6 in elastic film layer 2 interior outside in circular port 5 diameter range；Lubricating layer 3 exists
Pass through shape sealing ring 7 around circular port 5 and fastening bolt 8 is tightly connected with assembling die 1.Assembling die 1 is in adpting flange 9
Place is connected by fastening bolt 8.
Described assembling die 1 is made up of two halves docking, is connected by fastening bolt 8 at adpting flange 9；Assembling die
1 is square shape, and four sides centre position is equipped with hydraulic cavities 4, can obtain in the orthogonal both direction of sample
Earth pressure at rest.
In described elastic film layer 2, resistance strain gage 6 size of external pasting, model are identical with arrangement；When
Elastic film 2 stress drives resistance strain gage 6 that stretcher strain occurs after occuring bending and deformation；The diameter reduced resistance of circular port 5 should
Become the length=2 ~ 5mm of piece 6.
The described thickness of hydraulic cavities 4 is equal with the wall thickness of assembling die 1.
Gradient microstructure soil earth pressure at rest test method: gradient microstructure soil earth pressure at rest assay device is along wall
Thick direction is followed successively by that assembling die layer 1 is supporting course, elastic film layer 2 is measurement layer and friction drops in lubricating layer 3 from outside to inside
Layer, has Initial Gradient microstructure preparation and the dual-use function of subsequent stationary soil pressure anisotropy test；Controlled by dynamic
In hydraulic cavities 4 processed, fluid pressure realizes resistance strain gage 6 reading is zero, i.e. elastic film 2 interior outside resistance strain gage 6 difference of reading
Meansigma methodss be zero it is ensured that sample be in strict lateral spacing state be lateral deformation be zero, now in hydraulic cavities 4, fluid pressure is
The earth pressure at rest of sample；
Test in two stages:
A. freeze-thaw cycle preparation structure gradient sample: sample is put in assembling die 1, configures system in sample upper and lower ends
Cold drawing 11, realizes gradient microcosmic knot on thermograde direction for the sample by adjusting freeze-thaw cycle temperature and freezing-thawing cycles
Structure；
B. earth pressure at rest experimental stage.After freeze-thaw cycle, assembling die 1 and cold plate 11 are removed, and by sample perpendicular
Rotate in straight planeAgain put in assembling die 1 afterwards, configure porous disc 12 in sample upper and lower ends, carry out consolidation compression
Test.
Claims (6)
1. a kind of gradient microstructure soil earth pressure at rest assay device it is characterised in that: gradient microstructure soil carth pressure at rest
Power assay device includes: the assembling die with adpting flange for the both sides, elastic film layer, lubricating layer；Assembling die side interposition
Hydraulic cavities are installed, in hydraulic cavities, liquid is contacted with elastic film layer by circular port；Elastic film in circular port diameter range
It is pasted with resistance strain gage in layer interior outside；Lubricating layer passes through shape sealing ring and fastening bolt and combination die around circular port
Tool is tightly connected.
2. gradient microstructure according to claim 1 soil earth pressure at rest assay device it is characterised in that: described group
Matched moulds tool is made up of two halves docking, is connected by fastening bolt at adpting flange；The cross section of assembling die is square, four
Individual side centre position is equipped with hydraulic cavities, can obtain the earth pressure at rest in the orthogonal both direction of sample.
3. gradient microstructure according to claim 1 soil earth pressure at rest assay device it is characterised in that: described bullet
In property thin layer, the resistance-strain chip size of external pasting, model are identical with arrangement；When the generation of elastic film stress is curved
Drive resistance strain gage that stretcher strain occurs after bent deformation.
4. gradient microstructure according to claim 1 soil earth pressure at rest assay device it is characterised in that: circular port
Length=2 of diameter-resistance strain gage ~ 5mm.
5. gradient microstructure according to claim 1 soil earth pressure at rest assay device it is characterised in that: hydraulic cavities
Thickness is equal with the wall thickness of assembling die.
6. the test method of gradient microstructure soil earth pressure at rest assay device according to claim 1, its feature exists
In: gradient microstructure soil earth pressure at rest test method: gradient microstructure soil earth pressure at rest assay device is along wall thickness side
To being followed successively by from outside to inside, assembling die layer is supporting course, elastic film layer is measurement layer and lubricating layer drops frictional layer, has
Initial Gradient microstructure preparation and the dual-use function of subsequent stationary soil pressure anisotropy test；By dynamic control hydraulic cavities
The meansigma methodss that middle fluid pressure realizes elastic film interior outside resistance strain gage difference of reading are zero it is ensured that sample is in strict lateral spacing
State is lateral deformation is zero, and now in hydraulic cavities, fluid pressure is the earth pressure at rest of sample；
Test in two stages:
A. freeze-thaw cycle preparation structure gradient sample: sample is put in assembling die, configures cold plate in sample upper and lower ends,
Realize gradient microstructure on thermograde direction for the sample by adjusting freeze-thaw cycle temperature and freezing-thawing cycles；
B. earth pressure at rest experimental stage: after freeze-thaw cycle, assembling die and cold plate are removed, and by sample in perpendicular
Upper rotationAgain put in assembling die afterwards, configure porous disc in sample upper and lower ends, carry out consolidate compression test.
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| CN201410468902.8A CN104297066B (en) | 2014-09-15 | 2014-09-15 | Static soil pressure testing device and method for gradient microstructure soil |
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| CN201410468902.8A CN104297066B (en) | 2014-09-15 | 2014-09-15 | Static soil pressure testing device and method for gradient microstructure soil |
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| CN104297066B true CN104297066B (en) | 2017-01-18 |
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| CN107167366B (en) * | 2017-05-22 | 2020-07-14 | 西南交通大学 | Gradient pressurization experimental device and gradient pressurization method |
| CN107443541B (en) * | 2017-08-23 | 2019-05-17 | 北京科技大学 | It is used to prepare the device for producing molds and preparation test block method of the tailing-filled test block in mine |
| CN109916686A (en) * | 2019-04-04 | 2019-06-21 | 上海交通大学 | A kind of test sample of the anisotropy breaking strength of sheet metal |
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| US4955237A (en) * | 1989-06-07 | 1990-09-11 | Takenaka Corp | Method and apparatus for measurement of in-situ horizontal stress by freezing of the ground in-situ |
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