CN206177235U - A device for testing inside three -dimensional state of strain of soil body - Google Patents
A device for testing inside three -dimensional state of strain of soil body Download PDFInfo
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- CN206177235U CN206177235U CN201621144337.0U CN201621144337U CN206177235U CN 206177235 U CN206177235 U CN 206177235U CN 201621144337 U CN201621144337 U CN 201621144337U CN 206177235 U CN206177235 U CN 206177235U
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- soil body
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model provides a device for testing inside three -dimensional state of strain of soil body, six ordinary foil gages of the device are fixed in proper order on the foil gage base of six incorrelate faces of normal direction vector of dodecahedron, and the incorrelate face center of six normal vector of dodecahedron all is equipped with the wire guide that accesss to the dodecahedron centre of form, is connected with data acquisition system through the traversal. Provide a device for testing inside three -dimensional state of strain of soil body's test method simultaneously. The beneficial effects are that more accurately recording the three -dimensional state of strain of soil body position department, can obtaining the ascending line strain in maximum principal strain side, in six foil gage measured values, three main strain testing precision is 1.22 rho, and the measuring accuracy of three shearing strain is 0.71 rho, and the average test precision is 0.97 rho, has improved the folk prescription foil gage measuring accuracy that makes progress, has changed and to have tested surface strain and the unsafe limitation of test position in the past. The inside deformation state of the audio -visual reflection soil body of the device improves the safety stock of engineering construction.
Description
Technical field
This utility model belongs to the deformation in engineering and strain testing technical field, specially a kind of to be used to test in the soil body
The device of portion's three dimensional strain state, by the device line on the incoherent face of six normal vectors is obtained on granatohedron
Strain, is computed the three dimensional strain state that just can obtain testing at the soil body.
Background technology
The deformation of object and strain testing are a basic works in civil engineering, hydraulic engineering and traffic engineering
Make.It is the premise for carrying out engineering health monitoring and quantifying mechanical analyses.Deeply recognize the mechanical property of material, study answering for the soil body
Power, strain, accurately understand its stress and working condition, are the keys of quality evaluation and reinforcing maintenance in engineering construction.
Generally, the unidirectional strain testing of beaer and pure stress test can be counted by foil gauge and stress
Into.When the strain or stress studied on a certain determination direction, can using arrange in this direction foil gauge, stressometer or its
The mode of his sensor obtains mechanics parameter in this direction.For plane stress and strain problems, can be by body surface
The strain rosette for pasting conventional foil gauge composition measures.Conventional strain rosette is made up of three foil gauges, can only be measured in a certain plane
Strain conditions, and strain and stress epidemic situation comparison inside Rock And Soil is complicated in Practical Project, it is difficult to be reduced to it is one-dimensional or
The simple state of two dimension.Generally require to obtain the three dimensional strain state inside jobbie.
At present the three dimensional strain state inside Rock And Soil there is no widely used effective way, its Patent《For testing
The test device and its method of testing of three dimensional strain state》(publication No.：CN104482913A it is) based on six ribs of positive tetrahedron
Three dimensional strain embossing device.The device is less with soil body contact surface, and the skeleton for pasting foil gauge is easily sent out with the deformation of the soil body
Change shape, is not fixed easily its position in beaer, there is deviation so as to cause its test orientation, it is impossible to Accurate Determining ground
The three dimensional strain state of a certain determination position in body.The material selection elastic modelling quantity of the device pedestal is less than beaer material to be measured
Shaft-like plastics, the device is placed in beaer after stress deformation can not be re-used as disposable apparatus, material wave
Take serious, disagree with the environmental protection concept advocated.In order to obtain authentic and valid strain regime, it is necessary to inside soil body
Strain regime carries out more directly stable test.In such as base pit engineering, the stress of the various location soil body, strain regime are each
Differ, and depend on the impact of factors that form of construction work, construction progress, weather conditions etc. are difficult to quantify.Therefore, strengthen
The accurate measurements of beaer internal strain state under the conditions of three-dimensional state, not only weigh very much to ensureing construction quality and construction safety
Will, it is also the basic demand to information civil engineering construction.
The content of the invention
The purpose of this utility model is to provide a kind of device for testing inside soil body three dimensional strain state, to realize surveying
Examination inside soil body any point three dimensional strain state is directly and accurately tested.
For achieving the above object, the technical solution adopted in the utility model is to provide a kind of test inside soil body three dimensional strain
The device of state, wherein：The device includes base for granatohedron, six foil gauges, measure traverse line, center of area wires
Hole, foil gauge pedestal are collected in hole, wire；Six foil gauges are separately fixed at into the uncorrelated face of six normal vectors of granatohedron
Foil gauge pedestal on, the measure traverse line of six foil gauges is collected by center of area wire guide from the centre of form wire of granatohedron
Hole is connected after deriving with foil gauge data collecting system, forms three dimensional strain state testing device.
Effect of the present utility model is：The device adopts granatohedron to paste the base of foil gauge, rhombus 12
The manufacture method of face body is convenient, is directly to intercept acquisition by square, and granatohedron is made up of 12 complete equal faces,
The vector that foil gauge direction is pasted in each face is equal and unique with the angle of face normal.Therefore using granatohedron as this
The base of invention, test can be caused directly perceived and test position accurately, overcome that single foil gauge measuring accuracy is high, test position
Have that deviation, measurement direction are single, the technologies such as three dimensional strain state limitation cannot be obtained.In addition the method Computing Principle is clear and definite,
Computational accuracy is higher.Assume common foil gauge precision be ρ, the strain testing precision in calculated three principal strain directions
Respectively 1.22 ρ, the measuring accuracy of three shear stress is 0.71 ρ, and average test precision is 0.97 ρ, is improved in precision, more
Plus deformation state accurately, intuitively inside testee, and the device can reuse, composite green environmental protection concept, and
And the safety stock of raising engineering construction, provide new thinking and approach for strain testing technical field correlational study.
Description of the drawings
Fig. 1 is the direction vector of foil gauge of the present utility model；
Fig. 2 is the making figure of granatohedron of the present utility model；
Fig. 3 is granatohedron of the present utility model；
Fig. 4 is the granatohedron skeleton of placement foil gauge of the present utility model；
Fig. 5 is the top view of three dimensional strain test device of the present utility model；
Fig. 6 is three dimensional strain test device design sketch of the present utility model.
In figure：
1. the measure traverse line of 2. foil gauge of granatohedron 3.
4. the wire of center of area wire guide 5. collects the foil gauge pedestal of hole 6.
Specific embodiment
The device for testing inside soil body three dimensional strain state of the present utility model is described in detail with reference to accompanying drawing.
Apparatus structure for testing inside soil body three dimensional strain state of the present utility model is that the test device is included
Base is 1, six foil gauges 2 of granatohedron, measure traverse line 3, center of area wire guide 4, wire collect hole 5, foil gauge pedestal
6；Six foil gauges 2 are separately fixed on the foil gauge pedestal 6 in the uncorrelated face of 1 six normal vectors of granatohedron, six
The measure traverse line 3 of foil gauge by center of area wire guide 4 from the centre of form wire of granatohedron collect hole 5 derive after with foil gauge
Data collecting system is connected, and forms three dimensional strain state testing device.Using data collecting system six foil gauges of test
Reading, determines between transition matrix according to the reading of foil gauge on six different directions and each foil gauge direction cosines value
Relationship, and then it is calculated the three dimensional strain state of any point in the soil body.
What the device of test inside soil body three dimensional strain state of the present utility model was realized in：
1st, the granatohedron carcasing of foil gauge is laid：
In the circular hole of six centrally disposed a diameter of 1cm in face for pasting foil gauge, the circular hole vertically leads to rhombus dodecahedro
The centre of form of body, selects the face for not pasting foil gauge of granatohedron 1 and opens the circle that a diameter of 2cm leads to the centre of form thereon
Hole, to accommodate the passage of six common foil gauge measure traverse lines.It is face in the incoherent face of six normal vectors of granatohedron
α1、α2、α3、α4Dough-making powder β1、β2Foil gauge is pasted on the foil gauge pedestal of center, bonding is smeared in foil gauge bottom and side if necessary
Agent is ensureing foil gauge uniform force.
2nd, the assembling process of three dimensional strain test device：
First by measure traverse line 3 from the beginning of each bottom surface of foil gauge 2, through center of area wire guide 4 in granatohedron shape
Collect hole 5 by wire after converging at the heart to draw；Each foil gauge 2 is fixed on six foil gauge pedestals, then by polyurethane
Foam gap filler press-in filling collects in hole 5 to wire, and for filling the space between measure traverse line and wire guide, formation is based on
The three dimensional strain state testing device of foil gauge 2.The device is embedded in into the position to be measured of the soil body, is by strain data collection
Unified test obtains the strain value of six principal strain directions.
Device and method of testing for testing inside soil body three dimensional strain state of the present utility model, can be more accurately
Real strain regime inside soil body certain point to be measured is obtained, to strengthen the stability monitoring of the strain regime to inside soil body.
The granatohedron base of employing of the present utility model is made up of elastic modelling quantity more than the material of the soil body to be measured, therefore the base
Do not deform because of earth stress deformation so that test position is more stable.Foil gauge pedestal on granatohedron by
Elastic modelling quantity is made less than the material of the soil body to be measured, so that foil gauge deforms together with the stress soil body, more accurately
The dependent variable that the reaction stress soil body is produced.In addition granatohedron is directly intercepted by square and formed, simple for production.And the Pedicellus et Pericarpium Trapae
12 surfaces of shape dodecahedron are entirely equal, and the vector that foil gauge direction is pasted in each face is equal with the angle of face normal and only
One, therefore wait granatohedron measuring accuracy to be higher than other dodecahedron bases.
Claims (1)
1. a kind of device for testing inside soil body three dimensional strain state, the device is connected with data collecting system, and it is special
Levying is：The device includes base for granatohedron (1), six foil gauges (2), measure traverse line (3), center of area wire guides
(4), wire collects hole (5), foil gauge pedestal (6)；Six foil gauges (2) are separately fixed at into granatohedron (1) six
On the foil gauge pedestal (6) in the uncorrelated face of normal vector, the measure traverse line (3) of six foil gauges is by center of area wire guide (4) from Pedicellus et Pericarpium Trapae
The dodecahedral centre of form wire of shape collects after hole (5) is derived and is connected with foil gauge data collecting system, forms three dimensional strain shape
State test device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621144337.0U CN206177235U (en) | 2016-10-21 | 2016-10-21 | A device for testing inside three -dimensional state of strain of soil body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621144337.0U CN206177235U (en) | 2016-10-21 | 2016-10-21 | A device for testing inside three -dimensional state of strain of soil body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206177235U true CN206177235U (en) | 2017-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621144337.0U Active CN206177235U (en) | 2016-10-21 | 2016-10-21 | A device for testing inside three -dimensional state of strain of soil body |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108931326A (en) * | 2018-08-16 | 2018-12-04 | 福州大学 | A kind of strain gauge transducer and working method measuring soil pressure |
| CN111189992A (en) * | 2018-11-14 | 2020-05-22 | 新疆水利水电科学研究院 | Engineering soil body frost heaving force testing device |
-
2016
- 2016-10-21 CN CN201621144337.0U patent/CN206177235U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108931326A (en) * | 2018-08-16 | 2018-12-04 | 福州大学 | A kind of strain gauge transducer and working method measuring soil pressure |
| CN111189992A (en) * | 2018-11-14 | 2020-05-22 | 新疆水利水电科学研究院 | Engineering soil body frost heaving force testing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200120 Address after: 300384 Huayuan yinghuali 10-1-401, Nankai District, Tianjin Patentee after: Tianjin Sanwei Technology Co., Ltd Address before: 300384 No. 26, Jing Jing Road, Xiqing District, Tianjin Patentee before: Tianjin Chengjian University |
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| TR01 | Transfer of patent right |