CN102288480A - Device for sealing triaxial test sample of soil body and method for using device - Google Patents
Device for sealing triaxial test sample of soil body and method for using device Download PDFInfo
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- CN102288480A CN102288480A CN 201110175182 CN201110175182A CN102288480A CN 102288480 A CN102288480 A CN 102288480A CN 201110175182 CN201110175182 CN 201110175182 CN 201110175182 A CN201110175182 A CN 201110175182A CN 102288480 A CN102288480 A CN 102288480A
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Abstract
The invention discloses a device for sealing a triaxial test sample of a soil body and a method for using the device. A sealer consists of two semi-annular composite materials of which openings face each other, wherein one end of the sealer is provided with a tenon tongue, and the other end of the sealer is provided with a mortise; and grooves are reserved on a base and a loading device and used for placing an O-shaped sealing ring. When the device for sealing the triaxial test sample of the soil body is used, the O-shaped sealing ring is placed in the reserved groove of the base; after the O-shaped sealing ring is flattened and covers a rubber film of the base, a lower sealer is doweled on the rubber film and fixed on the base by a fixing screw; the sample moves to a test platform; and an upper sealer and the loading device are fixed together. In a test process, sealing is formed by extrusion between the sealer and the base or the loading device and a system internal pressure. The invention has the advantages of simple structure, easiness in implementation, simplicity and convenience for operation and low cost. By the invention, air leakage in the test can be effectively prevented. The method is a high-efficiency and practical method capable of preventing the air leakage of the sample in the triaxial test.
Description
Technical field
The invention belongs to Geotechnical Engineering experimental technique field, particularly a kind of soil body triaxial test sample packoff and using method.
Background technology
As far back as 1933, German Sha Feierte (Seffert) once studied the fixed of soil in Prussia's water channel testing station with triaxial apparatus, its objective is in order to reduce the sidewall friction of sample.The triaxial apparatus and China began one's study the 1950's.Nineteen fifty-three former Nanjing water conservancy project instrucment and meter plant, promptly present Nanjing Electric Power Automation Equipment factory has at first made the triaxial apparatus that claims to apply axial force with pound.The development of China's triaxial apparatus has been experienced from imitated can produce large, medium and small type triaxial apparatus series of products in batches at present to the process that designs voluntarily and make, and adopts advanced computer technology, automatic data collection and deal with data.Triaxial test has been listed the earthwork test rule and the national standard " Standard for test methods of earthworks " of China's industry in.Recent two decades comes, and no matter is aspect instrument and equipment, and still aspect experimental technique and test method, triaxial test all is the fastest a kind of test of technical development in the soil test.Triaxial test also is used for soil body pore pressure dissipation test, permeability test and static coefficient of horizontal pressure test etc. except being used to measure intensive parameter c and the φ.Remaining soil strength test method of comparing (simple shear, staight scissors etc.), the result of triaxial test more is close to engineering.
In experiment about rock, often adopt sample is contained in the thicker rubber membrane, be separately fixed on charger and the base with the upper and lower of bonding jumper then rubber membrane, obtain reasonable effect.But in general triaxial test, because native laxity for preventing the initial deformation of the soil body, requires to adopt thin rubber membrane, must just can not adopt bonding jumper to fix, because metal is easy to thin rubber membrane is poked about the soil body.In test at present, generally take the method that rubber membrane is fixed on base and the charger tightly to be prevented gas leakage with the rubber bar.But because rubber membrane is flexible, through regular meeting fold takes place when pricking bungee, cause leaking gas in the process of the test, particularly under bigger confined pressure situation, gas leak phenomenon is apparent in view, has a strong impact on test findings.Prick simultaneously bungee to the requirement of testing crew than higher, and be difficult for a people and finish, waste of manpower greatly and energy be the more important thing is not enough assurances of test findings.So in process of the test, keep good sealing property and easily operability be vital for triaxial test, but do not have the scholar to propose solution preferably at present as yet about this problem.
Summary of the invention
The objective of the invention is to overcome above-mentioned defective, propose a kind of soil body triaxial test sample packoff and using method.
The technical solution used in the present invention is:
A kind of soil body triaxial test sample packoff is characterized in that: at the upper surface of base and the lower surface of charger one week reservation groove is set respectively; O-ring seals is placed on to be reserved in the groove; Rubber membrane surface at base is provided with the lower seal device, on the rubber membrane surface of charger the top seal device is set; Top seal device, lower seal device are constructed identical, form by two that split semi-circular materials, and an end is established joint tongue, and an end is established mortise; Four Luo Dao all are set on top seal device and lower seal device, wherein have two to close the place at tenon; Last sealer is connected with charger by fixed screw, and lower sealing device is connected with base by fixed screw; Extruding between sealer and the stationary installation makes O-ring seals produce initial compression, gives its initial sealing ability; In the process of the test, total the synthetic sealing force of sealing force that is produced by system pressure and initial sealing power, it improves with the raising of system pressure.
The material preferable alloy of described packoff and the compound substance of asbestos also can be used metal.
Described packoff requires that elastic modulus is set on groove big, the material that intensity is high, and the O-ring seals of preferred composite rubber-plastic material (RP) also can be selected the other materials of identical function for use.
Described packoff diameter is than the big 2mm ~ 3mm of rubber membrane diameter.
Described O-ring seals does not add back-up ring when carrying out confined pressure less than the slow test of 20MPa, when pressure during greater than 20MPa, apply back-up ring;
The using method of described packoff comprises following technical step:
(1) rubber membrane is fixed on above the base with bungee, splitting the outside surface that film places rubber membrane, and uses lower clamp itself and base firmly are fixed together, lentamente rubber membrane is routed up from split cavity then;
(2) the sample layering hit real after, successively with upper clamp, split film and lower clamp unloads;
(3) O-ring seals is put in the reservation groove of base;
(4) in advance that another is thicker rubber membrane is enclosed within and holds on the film tube, then with its slowly cover on thin rubber membrane above, especially, rubber membrane will surpass in the length of base reserves groove;
(5) smooth rubber membrane on base, and lower seal device tenon on rubber membrane closed;
(6) four fixed screws evenly are set on the lower seal device, especially, have two screws to be arranged on joint tongue and mortise place, be fixed on it on base tightly;
(7) sample is moved to test platform after, the rubber membrane of smooth charger table portion closes top seal device tenon on rubber membrane, and four fixed screws evenly is set, and top seal device and charger are fixed together.
(8) carry out soil body triaxial test.Because the effect of the confined pressure in the process of the test can link together rubber membrane and O-ring seals more closely, confined pressure can produce positive effect to sealing.
Advantage of the present invention and effect are:
To the application scenario of variety classes fixing seal, the O RunddichtringO is a kind of not only effective but also economic seal element always.O type circle is a kind of two-way function seal element.Radially or the axial initial compression of aspect during installation, the initial sealing ability of giving O type circle self.Sealing force that is produced by system pressure and initial sealing power are synthesized total sealing force, and it improves with the raising of system pressure.O type circle has shown outstanding effect in the static seal occasion.Simultaneously,, therefore install to change and all be very easy to because O shape circle itself and installation position structure are all extremely simple, and have formed standardization, with other pattern O-ring seals relatively, have the following advantages: (1) structure is small and exquisite, installs and removes conveniently; (2) frictional resistance is smaller; (3) use the single-piece O-ring seals, can seal both direction; (4) cheap.
Packoff of the present invention can solve the problem of sample gas leakage effectively, and simple the transformation just can realize that part can be realized standardization on common three sample preparation devices, avoided irrational waste, saved resource effectively; The applicability of packoff of the present invention is very wide, both can be used for sand, also can be used for all kinds soil such as silt, clay; The not only easy in the use left-hand seat of packoff of the present invention, simple and direct, easy to operate, saved test period, the more important thing is and can improve the success ratio of test effectively, obtain ideal results.
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in detail.Protection scope of the present invention is not exceeded with embodiment, but is limited by claim.
Description of drawings
Accompanying drawing 1---constructional device schematic three dimensional views of the present invention.
Accompanying drawing 2---constructional device facade view of the present invention.
The A-A place sectional view of accompanying drawing 3---accompanying drawing 2 of the present invention.
The outside drawing of accompanying drawing 4---sealer of the present invention.
Accompanying drawing 5---the outside drawing of general three sample preparation devices.
Accompanying drawing 6---hold film tube synoptic diagram.
1 base, 2 split cavities, 3 lower clamp, 4 upper clamp, 5 casings, 6 force transmitting boards, 7 compaction hammers, 8 guide rods, 9 stops, 10 lower seal devices, 11 top seal devices, 12 rubber membranes, 13 chargers, 14 hold film tube, 15 samples, 16 upper clamp fixed screws, 17 lower clamp fixed screws, 18 lower seal device fixed screws, 19 top seal device fixed screws, 20O shape O-ring seal, 21 permeable stones, 22 plumbing passages.
Embodiment
Shown in accompanying drawing 1 ~ accompanying drawing 6, there is the sample preparation device of the soil body triaxial test of sealer to comprise to hit the sample tube, hits sample device and sealer three parts.Hit the sample tube and comprise base (1), split cavity (2), lower clamp (3), upper clamp (4) and casing (5), hit sample tube base (1) and be provided with split cavity (2), there are lower clamp (3) and upper clamp (4) in split cavity (2) outside respectively with its clamping, wherein lower clamp (3) is a clamshell type, with holes and connect by two strip terminals place with screw, upper clamp (4) is an annular, places split cavity (2) upward and with screw (16) to be connected with base (1); Hit the sample device and comprise force transmitting board (6), compaction hammer (7), guide rod (8), stop (9); Sealer comprises lower seal device (10) and top seal device (11), in order to keep good sealing property, O-ring seals (20) is set on base (1), lower seal device (10) is fixing with rubber membrane (12) and base (1), and top seal device (11) is fixing with rubber membrane (12) and charger (13).Lower seal device (10) is made up of two semicircles, and an end has joint tongue, and the other end has mortise, and four uniform screw-type circular holes are arranged on it; Top seal device (11) structure is with lower seal device (10).
Decide according to specimen size in the internal diameter of described O-ring seals (20) and line footpath, is example with the sample of diameter 10cm, and O-ring seals (20) can be selected: 115 * 5.3D GB 3452.1, and promptly selecting internal diameter is 115mm, line directly is the O-ring seals of 5.3mm.Choosing of O-ring seals (20) should meet GB 3452.1 requirements.
At the upper surface of base (1) and the lower surface of charger (13) all grooves are set respectively, the cross sectional shape of described groove should be advisable with rectangle, and particular case can be selected triangle or trapezoidal.The size of described groove is decided on O-ring seals size, is example with the O-ring seals of 115 * 5.3D GB 3452.1, the optional 4.7mm of the degree of depth of groove, and the optional 6.2mm of width especially, has bigger expansion if desired, and groove width can increase 20%.Choosing of groove dimensions should meet GB 3452.3 requirements.
Above-mentioned packoff is applicable to all types soil, and its using method comprises following technical step:
1. rubber membrane (12) is covered on the top of base (1), and tightly fix with bungee, and do not allow fold in the contact site;
2. prop up rubber membrane (12), and splitting the outside surface that film (2) places rubber membrane (12), upper clamp (4) and lower clamp (3) will be split film (2) by upper clamp fixed screw (16) and lower clamp fixed screw (17) respectively and be fixed on charger (13) and the base (1), and will split film (2) and be fixed into an integral body;
3. lentamente rubber membrane (12) is routed up from split film (2), and rubber membrane (12) is close on the arc plate of splitting film (2), prevent the specimen surface fold;
4. in order to make made sample relative compaction even, calculate the general assembly (TW) of sample according to relative compaction and volumescope earlier, then the sample mean break into portions;
5. first part of sample put into test specimen tube, force transmitting board (6) is put in the sample preparation, utilize compaction hammer (7) to hit reality along guide rod (8), hitting Star behind predetermined height, take away guide rod (8), compaction hammer (7) and force transmitting board (6) successively, and in order to obtain good whole, with surperficial hacking.Add second part, the 3rd part successively ..., until at last;
In order with upper clamp (4), split film (2) and lower clamp (3) unloads respectively;
7. O-ring seals (20) is put in the reservation groove of base (1);
8. the rubber membrane that another is thicker is enclosed within and holds on the film tube (14), and with inhaling ball rubber membrane and the air that holds between the film tube (14) is adsorbed, and rubber membrane is attached to tightly holds film tube (14) inwall;
9. with this thick rubber membrane surface that covers on thin rubber membrane (12) slowly, especially, rubber membrane (12) will surpass the position of reserving groove in the length of base, is advisable with the position that is no more than lower seal device fixed screw (18) simultaneously, removes and holds film tube (14);
10. smooth rubber membrane on base, and O-ring seals (20) and rubber membrane are attached to together, then lower seal device (10) tenon on rubber membrane is closed;
11. four fixed screws evenly are set on lower seal device (10), especially, there are two screws to be arranged on joint tongue and mortise place, it can be fixed on the base tightly.The initial compression that produce this moment, the initial sealing ability of giving O-ring seals (20) self;
12. after sample moved to test platform,, top seal device and charger are fixed together with the 6th step;
13. can apply confined pressure according to plan, a series of test operations such as saturated of bleeding.Sealing force that is produced by the cavity confined pressure and initial sealing power are synthesized total sealing force, and it improves with the raising of cavity confined pressure.
Claims (5)
1. a soil body triaxial test sample packoff is characterized in that: at the upper surface of base and the lower surface of charger one week reservation groove is set respectively; O-ring seals is placed on to be reserved in the groove; Rubber membrane surface at base is provided with the lower seal device, on the rubber membrane surface of charger the top seal device is set; Top seal device, lower seal device are constructed identical, form by two that split semi-circular structures; This semi-circular structure at one end is provided with joint tongue, and the other end is provided with mortise; Four Luo Dao all are set on top seal device and lower seal device, wherein have two to close the place at tenon; Last sealer is connected with charger by fixed screw, and lower sealing device is connected with base by fixed screw.
2. a kind of soil body triaxial test sample packoff according to claim 1 is characterized in that: the material preferable alloy of sealer and the compound substance of asbestos, also can use metal.
3. a kind of soil body triaxial test sample packoff according to claim 1, it is characterized in that: it is big on base and charger elastic modulus to be set, the material that intensity is high, preferred composite rubber-plastic material (RP) O-ring seals also can be selected the other materials of identical function for use.
4. a kind of soil body triaxial test sample packoff according to claim 1, it is characterized in that: the diameter of upper and lower sealer is all than the about 2mm ~ 3mm of rubber membrane.
5. using method based on the described soil body triaxial test of claim 1 sample packoff comprises following technical step:
Rubber membrane is fixed on the base with bungee, splitting the outside surface that film places rubber membrane, and uses lower clamp itself and base firmly are fixed together, lentamente rubber membrane is routed up from split cavity then;
The sample layering hit real after, successively with upper clamp, split film and lower clamp unloads;
O-ring seals is put in the reservation groove of base;
In advance that another is thicker rubber membrane is enclosed within and holds on the film tube, then with its slowly cover on thin rubber membrane above, especially, rubber membrane will surpass in the length of base reserves groove;
Smooth rubber membrane on base, and lower seal device tenon on rubber membrane closed;
Four fixed screws evenly are set on the lower seal device, especially, have two screws to be arranged on joint tongue and mortise place, be fixed on it on base tightly;
After sample moved to test platform, top seal device and charger are fixed together.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110175182 CN102288480B (en) | 2011-06-27 | 2011-06-27 | Device for sealing triaxial test sample of soil body and method for using device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110175182 CN102288480B (en) | 2011-06-27 | 2011-06-27 | Device for sealing triaxial test sample of soil body and method for using device |
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| CN102288480A true CN102288480A (en) | 2011-12-21 |
| CN102288480B CN102288480B (en) | 2013-01-02 |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102628767A (en) * | 2012-03-23 | 2012-08-08 | 河海大学 | Device and method for testing mechanical properties of pile-soil contact surface |
| CN103471891A (en) * | 2013-09-22 | 2013-12-25 | 山东科技大学 | Foot-pedal type compaction fixing device of soil-sample saturator |
| CN103760028A (en) * | 2014-01-07 | 2014-04-30 | 洛阳理工学院 | Confining pressure loading device for laboratory rock strength |
| CN104777028A (en) * | 2015-04-15 | 2015-07-15 | 温州大学 | Anti-disturbance sample installation device |
| CN105319095A (en) * | 2015-10-28 | 2016-02-10 | 广西大学 | Sample preparation equipment dedicated to triaxial test and capable of preparing high-density disturbed soil sample |
| CN106198137A (en) * | 2016-06-28 | 2016-12-07 | 河海大学 | A kind of unimolecule high polymer stockpile three axle sample making apparatus and using method |
| CN106826210A (en) * | 2017-01-09 | 2017-06-13 | 绍兴文理学院 | The erecting device of dual control up and down and its application method of a kind of triaxial test sealing ring |
| CN106826211A (en) * | 2017-01-09 | 2017-06-13 | 绍兴文理学院 | The electric erection equipment and its application method of a kind of triaxial test sealing ring |
| CN107389458A (en) * | 2017-06-23 | 2017-11-24 | 北京交通大学 | Balancing gate pit based on carbon fibre composite |
| CN108398316A (en) * | 2018-03-12 | 2018-08-14 | 中交天津港湾工程研究院有限公司 | Fixing device and its application method for sample to be connect with triaxial apparatus pedestal |
| CN109085040A (en) * | 2018-10-10 | 2018-12-25 | 兰州理工大学 | A kind of three axis sample preparation device of compacting process and method |
| CN109752254A (en) * | 2019-01-29 | 2019-05-14 | 青岛理工大学 | A kind of mobile rigid boxboard leakage-proof apparatus of geotechnique's true triaxial test and method |
| CN109827831A (en) * | 2019-01-10 | 2019-05-31 | 浙江工业大学 | A kind of dynamic triaxial tests cohesiveless soil dress original mold tool |
| CN113790950A (en) * | 2021-09-17 | 2021-12-14 | 长春市镨策试验仪器有限责任公司 | Pressure-bearing device for simulating high-energy-storage rock mass excavation unloading test and sealing method |
| CN109752254B (en) * | 2019-01-29 | 2024-04-26 | 青岛理工大学 | Device and method for preventing water leakage of movable rigid box plate in geotechnical true triaxial test |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102628767A (en) * | 2012-03-23 | 2012-08-08 | 河海大学 | Device and method for testing mechanical properties of pile-soil contact surface |
| CN102628767B (en) * | 2012-03-23 | 2014-01-22 | 河海大学 | Device and method for testing mechanical properties of pile-soil contact surface |
| CN103471891A (en) * | 2013-09-22 | 2013-12-25 | 山东科技大学 | Foot-pedal type compaction fixing device of soil-sample saturator |
| CN103760028A (en) * | 2014-01-07 | 2014-04-30 | 洛阳理工学院 | Confining pressure loading device for laboratory rock strength |
| CN104777028A (en) * | 2015-04-15 | 2015-07-15 | 温州大学 | Anti-disturbance sample installation device |
| CN105319095A (en) * | 2015-10-28 | 2016-02-10 | 广西大学 | Sample preparation equipment dedicated to triaxial test and capable of preparing high-density disturbed soil sample |
| CN106198137B (en) * | 2016-06-28 | 2019-03-29 | 河海大学 | A kind of three axis sample making apparatus of unimolecule high polymer stockpile and application method |
| CN106198137A (en) * | 2016-06-28 | 2016-12-07 | 河海大学 | A kind of unimolecule high polymer stockpile three axle sample making apparatus and using method |
| CN106826210A (en) * | 2017-01-09 | 2017-06-13 | 绍兴文理学院 | The erecting device of dual control up and down and its application method of a kind of triaxial test sealing ring |
| CN106826211A (en) * | 2017-01-09 | 2017-06-13 | 绍兴文理学院 | The electric erection equipment and its application method of a kind of triaxial test sealing ring |
| CN107389458A (en) * | 2017-06-23 | 2017-11-24 | 北京交通大学 | Balancing gate pit based on carbon fibre composite |
| CN108398316A (en) * | 2018-03-12 | 2018-08-14 | 中交天津港湾工程研究院有限公司 | Fixing device and its application method for sample to be connect with triaxial apparatus pedestal |
| CN109085040A (en) * | 2018-10-10 | 2018-12-25 | 兰州理工大学 | A kind of three axis sample preparation device of compacting process and method |
| CN109827831A (en) * | 2019-01-10 | 2019-05-31 | 浙江工业大学 | A kind of dynamic triaxial tests cohesiveless soil dress original mold tool |
| CN109827831B (en) * | 2019-01-10 | 2024-01-16 | 浙江工业大学 | Non-cohesive soil sample loading die for dynamic triaxial test |
| CN109752254A (en) * | 2019-01-29 | 2019-05-14 | 青岛理工大学 | A kind of mobile rigid boxboard leakage-proof apparatus of geotechnique's true triaxial test and method |
| CN109752254B (en) * | 2019-01-29 | 2024-04-26 | 青岛理工大学 | Device and method for preventing water leakage of movable rigid box plate in geotechnical true triaxial test |
| CN113790950A (en) * | 2021-09-17 | 2021-12-14 | 长春市镨策试验仪器有限责任公司 | Pressure-bearing device for simulating high-energy-storage rock mass excavation unloading test and sealing method |
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