CN201194012Y - Pressure chamber for earth-work triaxial instrument - Google Patents
Pressure chamber for earth-work triaxial instrument Download PDFInfo
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- CN201194012Y CN201194012Y CNU2008200586732U CN200820058673U CN201194012Y CN 201194012 Y CN201194012 Y CN 201194012Y CN U2008200586732 U CNU2008200586732 U CN U2008200586732U CN 200820058673 U CN200820058673 U CN 200820058673U CN 201194012 Y CN201194012 Y CN 201194012Y
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Abstract
The utility model relates to an earth work used triaxial cell, which comprises a sample base for mounting a sample, a pressure mantle with an open mouth on the bottom for covering the sample and the sample base and a piston in sliding fit with the cap center of the pressure mantle. The cross-section area and shape of the piston are the same as that of the tested sample in the pressure mantle. The device in the utility model realizes no lateral confinement condition to soil sample and loading to several soil samples with different sizes in same cell, adds the kind and maximum height of the test soil sample, improves the versatility of the cell, and can make the axial pressure of the sample no longer relevant to the confining pressure.
Description
Technical field
The utility model relates to a kind of triaxial apparatus pressure chamber in civil engineering work soil test field.
Background technology
Nineteen thirty, Harvard University's Casa Grande (A.Casagrande) research replaces direct shear test with the compression test of the cylindrical sample of stress boundary condition, to determine the intensity index of soil, later on, develop into the triaxial test of present widespread use through many soil mechanics experts' research and perfect.It can reflect intactly that the sample stress deformation is up to the overall process of destroying.Thereby both can do strength test, also can do the stress-strain relation test.It can simulate different operating modes, carries out the test of some different stress paths; Also can control drainage condition well, also can measure the excess pore water pressure of sample under the und rained condition.The sample stress state is clear and definite in the triaxial test, and strain measurement is simple and reliable, can more easily judge sample destruction, operates fairly simple.Like this, triaxial apparatus becomes indispensable instrument in the soil test.
Triaxial apparatus pressure chamber is an important component part of triaxial apparatus, and the off-load that adds of sample is all finished therein.Triaxial apparatus pressure chamber comprises base, pressure shield and three critical pieces of loading piston.The standard sample size of triaxial test has diameter 39.1mm, three kinds of 61.8mm and 101mm.Base central authorities are specimen mount of protruding several centimetres of base upper surfaces, and diameter is consistent with concrete sample.
The cross-sectional area of the piston of tradition pressure chamber (as Fig. 1) is less than the sectional area of sample, under the prerequisite that records volume of sample distortion (requiring sample can only be saturated sand, soil), the lateral deformation of sample could be controlled within the specific limits, also can't be limited the lateral deformation of sample fully.And sample is in the effect that axially also is subjected to confined pressure, and what real axle pressure was the pressure that transmits of piston with confined pressure is poor, so pressure and pressure chamber's confined pressure that must while control piston transmission could be controlled the axle pressure that sample is subjected to;
The size of tradition pressure chamber's base and pressure shield is corresponding one by one with the size of standard sample, has nothing in common with each other, and can't satisfy general requirement.
The utility model content
The purpose of this utility model is to provide a kind of earthwork triaxial apparatus pressure chamber, on the basis that does not influence the triaxial apparatus original function, sample is satisfied do not have lateral deformation condition (lateral confinement), finish fixed, overconsolidation, pore water pressure dissipation and the coefficient of static earth pressure K0 of samples such as saturated sand, saturated soil, unsaturation sand, unsaturated soil, dry sand and dry ground and mensuration that coefficient is pressed in the hole etc., and improve its versatility.
For achieving the above object, design of the present utility model is:
Piston cross-sectional area and the cross-sectional area with shape identical (as Fig. 2) of shape with the sample of concrete test.Perhaps between piston and pressure shield top cover, add several pistons sleeve (as Fig. 3 (a) and 4 (a)), piston, piston sleeve and pressure shield top cover cunning fit over together, radial arrangement latch on it, realize the assembling of various ways by the closure of latch, can obtain two subassemblies: the piston assembly that is fixed in the subassembly on the pressure shield and can slides, the cross-sectional area of piston assembly and the cross-sectional area with shape identical (as Fig. 3 (b), (c) and Fig. 4 (b), (c), (d)) of shape with the sample of concrete test.During test, the surface of contact between them satisfies sealing, and water under high pressure can't pass through.
Simultaneously, add several sleeves (as Fig. 3 (a) and Fig. 4 (a)) and constitute the base subassembly on the sample holder of base, the cross-sectional area of specimen mount or base subassembly is identical with the cross-sectional area and the shape of the sample of concrete test with shape.After the base sleeve slided on the base, the last end face of all sleeves flushed with the upper surface of specimen mount.During test, the surface of contact between them satisfies sealing, and water under high pressure can't pass through.
According to above-mentioned utility model design, the utility model adopts following technical proposals:
A kind of earthwork triaxial apparatus pressure chamber, comprise that one is settled the specimen mount of sample, a lower ending opening and covers pressure shield and a piston of joining with pressure shield top cap central bore cunning of sample and specimen mount, specifically the cross-sectional area and the shape of test sample are identical in the cross-sectional area that it is characterized in that piston and shape and the pressure chamber.
The cross-sectional area of said sample base is identical with the cross-sectional area and the shape of concrete test sample in the pressure chamber with shape.
Above-mentioned piston upper sliding sleeve n layer piston sleeve constitutes n kind piston assembly, and n is a natural number 1,2 ... n, internal layer piston sleeve and piston cunning are joined, and sliding mutually joining between the adjacent pistons sleeve, outer piston sleeve and pressure shield top cap central bore cunning are joined; Between internal layer piston sleeve and the piston, between the adjacent pistons sleeve and between outer piston sleeve and the pressure shield top cover, respectively by a radially latch realization axial location connection; The cross-sectional area of each piston assembly is respectively identical with the cross-sectional area and the shape of concrete test sample in a kind of pressure chamber respectively with shape.
Above-mentioned specimen mount upper sliding sleeve n layer base sleeve constitutes n kind base subassembly, and n is a natural number 1,2 ... n, the last end face of all base sleeves flushes with the upper surface of specimen mount; The cross-sectional area of each specimen mount subassembly is respectively identical with the cross-sectional area and the shape of the concrete test sample in a kind of pressure chamber respectively with shape.
The utility model has following conspicuous outstanding substantive distinguishing features and significant advantage compared with prior art:
1, the cross-sectional area of piston in the triaxial apparatus pressure chamber of the present utility model or piston assembly is identical with the cross-sectional area and the shape of sample with shape, the principle that obtains lateral confinement condition and coefficient of static earth pressure K0 (the horizontal effective stress of sample and the ratio of vertical effective stress) is simple, realize easily, and satisfy theoretic definition fully.Because the constancy of volume of the water in the pressure chamber, and compare with the soil body, think that water is incompressible, piston or piston assembly are pressed into the change amount that volume in the pressure chamber also just equals volume of sample, so the sample body strain can be expressed as:
In the formula, ε
vBe the volume of sample strain;
ε
aBe the sample axial strain;
Δ L is the length that piston or piston assembly are pressed into the pressure chamber, equals the change amount Δ H of the height of sample;
S is the sectional area of sample and piston or piston assembly;
H is the sample original height.
According to the mechanics formula, lateral deformation ε
r=(ε
v-ε
a)/2=0.
2, the material category of sample is expanded greatly, on the basis of saturated sand, soil, has expanded to unsaturation sand, unsaturated soil, dry sand and dry ground etc.
3, the sample maximum height increases, and can finish the test of samples such as multilayer reinforced earth, fiber soil.
4, the versatility of instrument improves greatly, and an instrument can be finished the test of a plurality of different size samples.
5, pass through the sealing of the surface of contact up and down of assurance pressure chamber's member and sample, the axle pressure that can accomplish sample is the pressure that piston passes over, and is no longer relevant with confined pressure.
Description of drawings
Fig. 1 is the structural representation of the earthwork triaxial apparatus pressure chamber of prior art.
Fig. 2 is the earthwork triaxial apparatus pressure chamber structural representation of first embodiment of the utility model.
(figure among the figure (a) is not for putting the pressure chamber structure figure of sample for the earthwork triaxial apparatus pressure chamber structural representation of second embodiment of the utility model for Fig. 3, figure (b) be piston sleeve and the pressure shield top cover trystate structural drawing fixedly the time, and scheming (c) is piston sleeve and the piston trystate structural drawing fixedly the time).
(figure among the figure (a) is not for putting the pressure chamber structure figure of sample for the earthwork triaxial apparatus pressure chamber structural representation of the 3rd embodiment of the utility model for Fig. 4, figure (b) is all trystate structural drawing fixedly time the with the pressure shield top cover of inside and outside piston sleeve, figure (c) fixes outer piston sleeve and the pressure shield top cover trystate structural drawing fixedly the time for inner carrier sleeve and piston, and scheming (d) is all trystate structural drawing fixedly time the with piston of inside and outside piston sleeve).
Embodiment
Embodiment one: referring to Fig. 2, this geotechnological triaxial apparatus pressure chamber comprises a specimen mount of settling sample 54, a lower ending opening and covers pressure shield and a piston 1 of joining with pressure shield 2 top cap central bore cunnings of sample 5 and specimen mount 4, and specifically the cross-sectional area and the shape of test sample 5 are identical in the cross-sectional area of described piston 1 and shape and the pressure chamber.The cross-sectional area of described specimen mount 4 is identical with the cross-sectional area and the shape of concrete test sample 5 in the pressure chamber with shape.
Embodiment two: referring to Fig. 3, present embodiment is basic identical with embodiment one, institute's difference is that piston sleeve 8-1 of piston 1 upper sliding sleeve constitutes piston assembly, between piston sleeve 8-1 and the piston 1 and with the pressure shield top cover between can by one radially latch 11 realize that axial location are connected, all have pin hole 10 and latch to mate on piston sleeve 8-1 and the pressure shield upper top cover.A base sleeve of specimen mount 4 upper sliding sleeves 9-1 constitutes the base subassembly, and base sleeve 9-1 goes up end face and flushes with specimen mount 9 upper surfaces.
The section external diameter of the cross section diameter of piston 1 and piston sleeve 8-1 is measure-alike with standard sample successively, and layout latch 11 above them, assembling by various ways, can obtain two subassemblies: the piston assembly that is fixed in the subassembly on the pressure shield 2 and can slides, and the cross-sectional area of piston assembly and the cross-sectional area with shape identical (as Fig. 3 (b), (c) and 4 (b), (c), (d)) of shape with the sample 5 of concrete test.The section external diameter of the cross section diameter of specimen mount 4 and base sleeve 9-1 is measure-alike with standard sample successively.Piston 1 sees Table 1 with piston assembly and specimen mount 4 with base subassembly size.
The size of table 1 piston and piston assembly and specimen mount and base subassembly (mm)
| Combination | First group | Second group | The 3rd group |
| D 1 | 39.1 | 61.8 | 39.1 |
| D 2 | 61.8 | 101 | 101 |
Annotate: D
1And D
2It is respectively the cross section diameter of piston 1 (specimen mount 4) and piston assembly (base subassembly).
During loading, the surface of contact between piston assembly and sample 5 end faces satisfies sealing, and water under high pressure can't pass through.
Embodiment three: referring to Fig. 4, present embodiment is basic identical with embodiment two, and institute's difference is to overlap a piston sleeve 8-2 on the piston sleeve 8-1 again, is increasing base sleeve 9-2 of cover on base sleeve 9-1.The section external diameter of piston 1 (specimen mount 4) cross section diameter and piston sleeve 8-1,8-2 (base sleeve 9-1,9-2) is respectively: D
1=39.1mm, D
2=61.8mm and D
3=101mm.
During loading, the surface of contact between piston assembly and sample 5 end faces satisfies sealing, and water under high pressure can't pass through.
Claims (4)
1. earthwork triaxial apparatus pressure chamber, comprise that one is settled the specimen mount (4) of sample (5), a lower ending opening and covers pressure shield and a piston (1) of joining with pressure shield (2) top cap central bore cunning of sample (5) and specimen mount (4), specifically the cross-sectional area and the shape of test sample (5) are identical in its cross-sectional area that specifically is characterised in that described piston (1) and shape and the pressure chamber.
2. earthwork triaxial apparatus pressure chamber according to claim 1 is characterized in that the cross-sectional area of described specimen mount (4) is identical with the cross-sectional area and the shape of concrete test sample (5) in the pressure chamber with shape.
3. earthwork triaxial apparatus pressure chamber according to claim 1, it is characterized in that described piston (1) upper sliding sleeve n layer piston sleeve (8-1,8-2 ... 8-n) constitute several piston assemblies, n is a natural number 1,2 ... n, internal layer piston sleeve (8-1) is joined with piston (1) is sliding, sliding mutually joining between the adjacent pistons sleeve, outer piston sleeve (8-n) is joined with pressure shield (2) top cap central bore cunning; Between internal layer piston sleeve (8-1) and the piston (1), between the adjacent pistons sleeve and between outer piston sleeve (8-n) and pressure shield (2) top cover, respectively by a radially latch realization axial location connection; The cross-sectional area of each piston assembly is respectively identical with the cross-sectional area and the shape of concrete test sample in a kind of pressure chamber respectively with shape.
4. earthwork triaxial apparatus pressure chamber according to claim 3, it is characterized in that described specimen mount (4) upper sliding sleeve n layer base sleeve (9-1,9-2 ... 9-n) constitute n kind base subassembly, n is a natural number 1,2 ... n, all base sleeve (9-1,9-2 ... last end face 9-n) flushes with the upper surface of specimen mount (9); The cross-sectional area of each specimen mount subassembly is respectively identical with the cross-sectional area and the shape of the concrete test sample in a kind of pressure chamber respectively with shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200586732U CN201194012Y (en) | 2008-05-20 | 2008-05-20 | Pressure chamber for earth-work triaxial instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200586732U CN201194012Y (en) | 2008-05-20 | 2008-05-20 | Pressure chamber for earth-work triaxial instrument |
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| Publication Number | Publication Date |
|---|---|
| CN201194012Y true CN201194012Y (en) | 2009-02-11 |
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ID=40393546
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200586732U Expired - Fee Related CN201194012Y (en) | 2008-05-20 | 2008-05-20 | Pressure chamber for earth-work triaxial instrument |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101929928A (en) * | 2010-07-29 | 2010-12-29 | 大连理工大学 | Protective device of double internal sleeve one-direction extension small-load sensor |
| CN104913970A (en) * | 2015-06-16 | 2015-09-16 | 攀枝花学院 | Experiment method of mechanical performance of Xigeda soil doped linen fiber |
| CN111472396A (en) * | 2020-06-28 | 2020-07-31 | 西南交通大学 | Rotating hyperbolic pile-soil model test device and test method based on long-exposure observation |
| CN111896385A (en) * | 2020-07-16 | 2020-11-06 | 水利部交通运输部国家能源局南京水利科学研究院 | Device for multi-size coarse-grained soil conventional triaxial test and using method thereof |
-
2008
- 2008-05-20 CN CNU2008200586732U patent/CN201194012Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101929928A (en) * | 2010-07-29 | 2010-12-29 | 大连理工大学 | Protective device of double internal sleeve one-direction extension small-load sensor |
| CN101929928B (en) * | 2010-07-29 | 2012-09-05 | 大连理工大学 | Protective device of double internal sleeve one-direction extension small-load sensor |
| CN104913970A (en) * | 2015-06-16 | 2015-09-16 | 攀枝花学院 | Experiment method of mechanical performance of Xigeda soil doped linen fiber |
| CN111472396A (en) * | 2020-06-28 | 2020-07-31 | 西南交通大学 | Rotating hyperbolic pile-soil model test device and test method based on long-exposure observation |
| CN111896385A (en) * | 2020-07-16 | 2020-11-06 | 水利部交通运输部国家能源局南京水利科学研究院 | Device for multi-size coarse-grained soil conventional triaxial test and using method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090211 |