CN103604697A - Fake triaxial creeping device and method for geotechnical engineering under uniform confining pressure - Google Patents
Fake triaxial creeping device and method for geotechnical engineering under uniform confining pressure Download PDFInfo
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- CN103604697A CN103604697A CN201310598127.3A CN201310598127A CN103604697A CN 103604697 A CN103604697 A CN 103604697A CN 201310598127 A CN201310598127 A CN 201310598127A CN 103604697 A CN103604697 A CN 103604697A
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Abstract
The invention discloses a fake triaxial creeping device for geotechnical engineering under a uniform confining pressure. The fake triaxial creeping device comprises a force applying device, wherein the force applying device is contacted with one end of a test piece needing to be tested by a pressure sensor; readings of a control sensor guarantee that an applied axial force of the force applying device is constant; a rubber ring covers the outer part of the test piece so as to ensure that the confining pressure is applied uniformly and vertically; a sheet-shaped flexible material piece is uniformly wound at the outer part of the rubber ring; one end of the sheet-shaped flexible material piece is fixedly arranged on a clamp and the other end of the sheet-shaped flexible material piece is movably connected to a loading device; a uniform pull force on the sheet-shaped flexible material piece finally acts on the test piece by the loading device to finish the application of the confining pressure. The invention simultaneously discloses an operation method of the device. The fake triaxial creeping device can effectively guarantee that the confining pressure is applied uniformly and vertically; the experiment efficiency is improved and the experiment operation is convenient.
Description
Technical field
The present invention relates to a kind of Geotechnical Engineering, especially a kind of for the false triaxial creepage device and method under Geotechnical Engineering Even round pressure.
Background technology
At present, creep refers to that solid material is keeping under the condition that stress is constant, and strain extends and the phenomenon that increases in time.It is different from plastic yield, and plastic yield just occurs conventionally after stress surpasses limit of elasticity, and that creep needs only the action time of stress is quite long, and it also can occur when stress is less than limit of elasticity.
In Geotechnical Engineering, creep is very general, and a lot of Geotechnical Engineering disasters are also closely bound up with Rock And Soil creep, as landslide, and landslide, settlement of foundation etc., therefore study Rock And Soil creep very necessary, and this is also the important guarantee of geotechnical engineering safety.
At present, both at home and abroad Rock And Soil creep is conducted in-depth research, corresponding experimental provision arises at the historic moment, and single shaft creep test device is comparatively general, but actual forced status that can not accurate description test specimen, false triaxial creep testing machine adopts oil pressure to apply circumferential pressure, operate very loaded down with trivial details, and labor intensive material resources, other devices are the close approximation of confined pressure just also, cannot reach hoop and exert pressure uniformly, be difficult to reach current creep test.
Summary of the invention
The object of the invention is for overcoming above-mentioned the deficiencies in the prior art, provide that a kind of it can effectively guarantee evenly vertically applying of confined pressure for the false triaxial creepage device and method under Geotechnical Engineering Even round pressure, improve conventional efficient, facilitate experimental implementation.
For achieving the above object, the present invention adopts following technical proposals:
A kind of for the false triaxial creepage device under Geotechnical Engineering Even round pressure, comprise augmentor, augmentor is through pressure transducer and test specimen one end in contact that needs test, by controlling the reading of sensor, guarantee that augmentor applies the constant of axial compression, test specimen outer wrap has rubber ring, guarantee evenly vertically applying of confined pressure, the outside uniform winding of rubber ring has sheet flexible material part, one end of sheet flexible material part is fixed on fixture, the other end is movably connected on charger, by charger, the uniform tension of sheet flexible material part is finally acted on to test specimen, complete applying of confined pressure.
Described test specimen is fixed on the horizontal component that section is L shaped base, in base vertical portion, is provided with fixture.
Described base vertical portion upper surface and two side intersections are respectively equipped with the roller of pressing base length direction, and roller can reduce friction, guarantees accurately applying of confined pressure.
Described fixture comprises the first component being fixed on base vertical portion upper surface, and be connected in the second component on first component by web member, and on corresponding with second component of first component, be respectively equipped with intermeshing toothed member, one end of flexible material layer is anchored between first component and the toothed member of second component by web member.
The arcuate structure of the first component side corresponding with test specimen for matching with test specimen outside surface.
Described first component is provided with the hole passing for sheet flexible material part.
Described charger comprises loading pallet, loads center on tray upper surface and is provided with loading pallet engaging lug, and described engaging lug is provided with axis hole, and the centre position of sheet flexible material part one end is passed axis hole by rotating shaft and is connected on described engaging lug.Load pallet and sheet flexible material part central shaft hinged, force action, in sheet flexible material part center, prevents that test specimen is subject to bias voltage.
Described augmentor is lifting jack.
A method of operating for the false triaxial creepage device under Geotechnical Engineering Even round pressure, comprising:
(1) creep device is placed in to testing table edge, and device pedestal is fixed on testing table;
(2) rubber ring is wrapped to creep test specimen, lie against on testing table, by fixture, sheet flexible material part one end of known features is fixed on fixture, wraps after test specimen, sheet flexible material part end is hung down and loading pallet is fixed on to sheet flexible material part end;
(3) set creep confined pressure, and the corresponding counterweight weight that loads of conversion, counterweight is placed on and is loaded in pallet;
(4) contrast test is set, the counterweight of equivalent weight is directly acted on the sheet flexible material part of same length, offset the error that the creep of sheet flexible material part self brings;
(5) after confined pressure loads and stablizes, by lifting jack, apply axial compression, by controlling the reading of sensor, control the constant of axial compression;
(6) record the initial position of jack end and sheet flexible material part end, every the corresponding time, again carry out record, by the drop-out value of sheet flexible material part end, calculate the change in radius of test specimen, draw hoop strain, by recording axial displacement, obtain test specimen axial strain, finally obtain the creep characteristic curve of test specimen;
(7) change circumferential pressure and axle pressure value, repeat above operation, obtains the creep properties of test specimen under different acting forces.
The present invention evenly wraps up test specimen by sheet flexible material part, by loading counterweight, the uniform tension of sheet flexible material part is finally acted on to test specimen, completes applying of confined pressure; Load pallet and sheet flexible material part central shaft hinged, force action, in sheet flexible material part center, prevents that test specimen is subject to bias voltage; Test specimen hoop is wrapped up by rubber ring, further guarantees evenly vertically applying of confined pressure; Applying by lifting jack of axial compression loads realization, between lifting jack and test specimen, settles pressure transducer; By controlling the reading of sensor, guarantee the constant of axial compression.
The sheet flexible material part pulling force that confined pressure provides by gravitational load, and then act on around test specimen, sheet flexible material part turnover position arranges roller, reduces friction, guarantees accurately applying of confined pressure.
The mode of sheet flexible material part parcel test specimen applies confined pressure, and wherein sheet flexible material part creep properties is known, can try to achieve the perimeter change of test specimen, thereby extrapolate test specimen hoop strain by the deflection of sheet flexible material part loaded segment.
The loading pallet and the sheet flexible material part end center that apply confined pressure are hinged, effectively prevent from tilting to load producing moment of flexure, avoid partially drawing the generation of phenomenon, warranty test precision.
Test specimen with rubber ring parcel, guarantees evenly vertically applying of confined pressure around, meets the requirement of low-intensity experiment, improves precision.
Applying by lifting jack of axial compression loads realization, by the reading of controlled pressure sensor, guarantees the constant accurate of the suffered axial compression of test specimen.
The present invention compares and has the following advantages with measuring method in the past:
1 the invention solves the inconvenience in experiment in the past, and the mode of wrapping up test specimen by sheet flexible material part applies confined pressure, reaches evenly vertically applying of confined pressure.
2 test specimens wrap up rubber ring around, confined pressure are applied more even, and have avoided unnecessary frictional influence.
3 by setting up the mode of contrast test, offsets the error that the creep of sheet flexible material part self brings, and obtains real test specimen perimeter change, thereby draw test specimen hoop strain.
4 load pallet by sheet flexible material part end center, and are hinged, have avoided tilting to load the Moment Influence bringing, and prevent that sheet flexible material part is subject to partially drawing effect.
The installation of 5 pressure transducers has guaranteed the constant of creep confined pressure, guarantees the accuracy of creep test.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is other direction view of the present invention;
1 lifting jack wherein; 2 pressure transducers; 3 rubber rings; 4 creep test specimens; 5 stationary fixtures; 6 fixed screws; 7 sheet flexible material parts; 8 load tray rotating shaft; 9 load pallet; 10 rotation rollers; 11 instrument firm bankings.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
For the false triaxial creepage new device under Geotechnical Engineering Even round pressure, top mainly comprises instrument firm banking 11, rotation roller 10, lifting jack 1, pressure transducer 2, rubber ring 3, creep test specimen 4, stationary fixture 5, fixed screw 6; Centre is sheet flexible material part 7, and bottom, for loading tray rotating shaft 8, loads pallet 9.The pressure transducer 2 of its middle and upper part is embedded between lifting jack 1 and creep test specimen 4, test block is around with rubber ring 3 parcels, sheet flexible material part 7 one end are fixed on stationary fixture 5, fastening with screw 6, and uniform winding rubber ring 3, by rotation roller 10, other end embedding loads tray rotating shaft 8, the fixing pallet 9 that loads in tray rotating shaft below.
A kind ofly for the false triaxial creepage under Geotechnical Engineering Even round pressure, put, method of operating comprises the following steps:
(1) creep device is placed in to testing table edge, and device pedestal is fixed on testing table.
(2) rubber ring 3 is wrapped to creep test specimen 4, lie against on testing table, by stationary fixture 5,7 one sections of the sheet flexible material parts of known features are fixed on device, wrap after creep test specimen 4, sheet flexible material part 7 ends are hung down, and will load pallet and fix 8 at sheet flexible material part 7 ends.
(3) set creep confined pressure, and the corresponding counterweight weight that loads of conversion, counterweight is placed on and is loaded in pallet 9.
(4) contrast test is set, the counterweight of equivalent weight is directly acted on the sheet flexible material part 7 of same length, offset the error that sheet flexible material part 7 self creep brings.
(5) after confined pressure loads and stablizes, by lifting jack 1, apply axial compression, by controlling the reading of sensor 2, control the constant of axial compression.
(6) record the initial position of lifting jack 1 end and sheet flexible material part 7 ends, every the corresponding time, again carry out record, by the drop-out value of sheet flexible material part 7 ends, calculate the change in radius of creep test specimen 4, draw hoop strain, by recording axial displacement, obtain 4 axial strains of creep test specimen, finally obtain the creep characteristic curve of test specimen.
(7) change circumferential pressure and axle pressure value, repeat above operation, obtains the creep properties of test specimen under different acting forces.
Although above-mentioned, by reference to the accompanying drawings the specific embodiment of the present invention is described; but be not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (9)
1. one kind for the false triaxial creepage device under Geotechnical Engineering Even round pressure, it is characterized in that, comprise augmentor, augmentor is through pressure transducer and test specimen one end in contact that needs test, by controlling the reading of sensor, guarantee that augmentor applies the constant of axial compression, test specimen outer wrap has rubber ring, guarantee evenly vertically applying of confined pressure, the outside uniform winding of rubber ring has sheet flexible material part, one end of sheet flexible material part is fixed on fixture, the other end is movably connected on charger, by charger, the uniform tension of sheet flexible material part is finally acted on to test specimen, complete applying of confined pressure.
2. as claimed in claim 1ly for the false triaxial creepage device under Geotechnical Engineering Even round pressure, it is characterized in that, described test specimen is fixed on the horizontal component that section is L shaped base, in base vertical portion, is provided with fixture.
3. as claimed in claim 2 for the false triaxial creepage device under Geotechnical Engineering Even round pressure, it is characterized in that, described base vertical portion upper surface and two side intersections are respectively equipped with the roller of pressing base length direction, and roller can reduce friction, guarantees accurately applying of confined pressure.
4. as claimed in claim 2 for the false triaxial creepage device under Geotechnical Engineering Even round pressure, it is characterized in that, described fixture comprises the first component being fixed on base vertical portion upper surface, and be connected in the second component on first component by web member, and on corresponding with second component of first component, be respectively equipped with intermeshing toothed member, one end of flexible material layer is anchored between first component and the toothed member of second component by web member.
5. as claimed in claim 4ly for the false triaxial creepage device under Geotechnical Engineering Even round pressure, it is characterized in that the arcuate structure of the first component side corresponding with test specimen for matching with test specimen outside surface.
6. as claimed in claim 4ly for the false triaxial creepage device under Geotechnical Engineering Even round pressure, it is characterized in that, described first component is provided with the hole passing for sheet flexible material part.
7. as claimed in claim 1 for the false triaxial creepage device under Geotechnical Engineering Even round pressure, it is characterized in that, described charger comprises loading pallet, load center on tray upper surface and be provided with loading pallet engaging lug, described engaging lug is provided with axis hole, the centre position of sheet flexible material part one end is passed axis hole by rotating shaft and is connected on described engaging lug, load pallet and sheet flexible material part central shaft hinged, force action, in sheet flexible material part center, prevents that test specimen is subject to bias voltage.
8. as claimed in claim 1ly for the false triaxial creepage device under Geotechnical Engineering Even round pressure, it is characterized in that, described augmentor is lifting jack.
9. for a method of operating for the false triaxial creepage device under Geotechnical Engineering Even round pressure, it is characterized in that, comprising:
(1) creep device is placed in to testing table edge, and device pedestal is fixed on testing table;
(2) rubber ring is wrapped to creep test specimen, lie against on testing table, by fixture, sheet flexible material part one end of known features is fixed on fixture, wrap after test specimen, sheet flexible material part end is hung down, and loading pallet is fixed on to sheet flexible material part end;
(3) set creep confined pressure, and the corresponding counterweight weight that loads of conversion, counterweight is placed on and is loaded in pallet;
(4) contrast test is set, the counterweight of equivalent weight is directly acted on the sheet flexible material part of same length, offset the error that the creep of sheet flexible material part self brings;
(5) after confined pressure loads and stablizes, by lifting jack, apply axial compression, by controlling the reading of sensor, control the constant of axial compression;
(6) record the initial position of jack end and sheet flexible material part end, every the corresponding time, again carry out record, by the drop-out value of sheet flexible material part end, calculate the change in radius of test specimen, draw hoop strain, by recording axial displacement, obtain test specimen axial strain, finally obtain the creep characteristic curve of test specimen;
(7) change circumferential pressure and axle pressure value, repeat above operation, obtains the creep properties of test specimen under different acting forces.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112268786A (en) * | 2020-11-03 | 2021-01-26 | 青岛理工大学 | Rock-like material bidirectional pressure test device and working method |
| CN112284901A (en) * | 2020-10-28 | 2021-01-29 | 贵州大学 | Pseudo-triaxial rock testing machine and using method thereof |
| CN113075051A (en) * | 2021-04-01 | 2021-07-06 | 辽宁工程技术大学 | Simulation test device and test method for soft rock compressive creep similar environment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112284901A (en) * | 2020-10-28 | 2021-01-29 | 贵州大学 | Pseudo-triaxial rock testing machine and using method thereof |
| CN112268786A (en) * | 2020-11-03 | 2021-01-26 | 青岛理工大学 | Rock-like material bidirectional pressure test device and working method |
| CN112268786B (en) * | 2020-11-03 | 2023-03-24 | 青岛理工大学 | Rock-like material bidirectional pressure test device and working method |
| CN113075051A (en) * | 2021-04-01 | 2021-07-06 | 辽宁工程技术大学 | Simulation test device and test method for soft rock compressive creep similar environment |
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