CN203929511U - A kind of device of calculating soil's Poisson ratio - Google Patents
A kind of device of calculating soil's Poisson ratio Download PDFInfo
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- CN203929511U CN203929511U CN201420306358.2U CN201420306358U CN203929511U CN 203929511 U CN203929511 U CN 203929511U CN 201420306358 U CN201420306358 U CN 201420306358U CN 203929511 U CN203929511 U CN 203929511U
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- poisson ratio
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- earth pillar
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Abstract
The utility model discloses a kind of device of calculating soil's Poisson ratio, comprise be placed on tested earth pillar top top board, be placed on the lower platen of tested earth pillar bottom and be sleeved on the flexible steel ring on tested earth pillar outer ring, one of the lateral surface bonding of described flexible steel ring is measured the sensor I of soil body transversely deforming, is provided with a sensor II who measures soil body vertical deformation in the bottom of described top board.The utility model utilizes two resistance-type displacement meters to measure respectively vertical deformation and the transversely deforming of the soil body, thereby extrapolates the Poisson ratio of the soil body.Solve the difficult problem of surveying of soil's Poisson ratio by contributing to, measure in this way in addition soil's Poisson ratio more simple and more accurate than pasting foil gauge.
Description
Technical field
The utility model provides a kind of device of calculating soil's Poisson ratio, belongs to field of civil engineering.
Background technology
Poisson ratio is found at first and proposed by French scientist, he is in " elastic body balance and motion study report " literary composition of delivering for 1829, derive the elastomeric equation of motion by the theory of intermolecular interaction, find can propagate compressional wave and shear wave in elastic medium, and deduce out theoretically isotropic elasticity bar in the time being subject to longitudinal stretching, transversal shrinkage strain is a constant with the ratio of longitudinal tensile strain strain.So in the proportional limit of material, be called Poisson ratio by the caused transverse strain of equally distributed meridional stress and the absolute value of the ratio of corresponding longitudinal strain.
In the proposition history of nearly 200 years of Poisson ratio, the method of measuring material Poisson ratio emerges in an endless stream, and is mainly measured as master to paste foil gauge now, and this method is very accurate in the time measuring elastomeric Poisson ratio, but for the weak material of some elasticity, measurement is but very difficult in this way, such as the soil body, in the time measuring the Poisson ratio of the soil body by the method for pasting foil gauge, in soil body compression process, soil body distortion easy to crack, foil gauge easily comes off, and experiments of measuring cannot normally be carried out.
Utility model content
In order to solve problems of the prior art, the utility model proposes a kind of new method that is applicable to calculate soil's Poisson ratio, its Integrated using flexible thin steel ring, resistance-type displacement meter, benchmark support and pressing machine are calculated the Poisson ratio of the soil body, this method is more simple and more accurate than pasting foil gauge, but this utility model is not suitable for measuring the Poisson ratio of semi-rigid body, as rock etc.
The technical solution adopted in the utility model is as follows:
A kind of device of calculating soil's Poisson ratio, comprise be placed on tested earth pillar top top board, be placed on the lower platen of tested earth pillar bottom and be sleeved on the flexible steel ring on tested earth pillar outer ring, one of the lateral surface bonding of described flexible steel ring is measured the sensor I of soil body transversely deforming, is provided with a sensor II who measures soil body vertical deformation in the bottom of described top board.
Described sensor I connects a collar; The described collar is sleeved on benchmark support.
Described sensor II is fixed on benchmark support.
Described sensor I, sensor II are resistance-type displacement meter.
Described sensor II tip leans against on the top board of pressing machine.
Described top board, lower platen are all positioned on pressing machine, and top board provides downward pressure to tested earth pillar.
Described benchmark support is connected with lower platen, is arranged on the side of top board and lower platen.
The method of described measuring and calculating soil's Poisson ratio, comprises the following steps:
(1) the about 40cm of preparation a slice flexible thin steel disc is long, 1cm is wide, be made into round, and its side and resistance-type displacement meter I are bonded together, and the little collar that bonds on this resistance-type displacement meter, prepare again a resistance-type displacement meter II, and prefabricated what a benchmark support;
(2) ready made benchmark support is fixed on the lower platen of pressing machine;
(3) make cylindrical tested earth pillar, for subsequent use after moulding;
(4) the thin steel ring that is fixed with resistance-type displacement meter I is placed on right cylinder test specimen, and be placed on pressing machine lower platen, the little cover of resistance-type displacement meter I is located on benchmark support simultaneously, another resistance-type displacement meter II is fixed on benchmark support, resistance-type displacement meter tip is leaned against on pressing machine top board.
(5) opening pressure machine, makes its compression specimens, records the variable quantity of resistance-type displacement meter in soil body compression process, until damage of soil body.
(6) according to the Poisson ratio of the formula calculating soil body.
The computing method of the Poisson ratio of the soil body described in step (6) are as follows:
Within the scope of elastic properties of materials, x wire strain stress
horizontalwith vertical strain stress
perpendicularratio be a constant, the absolute value of its ratio is the Poisson ratio of material, conventionally represents with μ,
When by this utility model measurement device soil's Poisson ratio, due to the compression of pressing machine to tested earth pillar, make tested earth pillar produce vertical displacement, this displacement is by the resistance-type displacement meter record at pressing machine top board place, this value is designated as Δ h, former tested earth pillar height is designated as h, and the vertical strain of tested earth pillar is
the vertical strain of test specimen will inevitably cause the distortion that the soil body is horizontal, and this value, by the resistance-type displacement meter record that is positioned at tested earth pillar position, is designated as Δ l, and the diameter of former tested earth pillar is designated as d, and the transverse strain of tested earth pillar is
the Poisson ratio that can obtain thus tested earth pillar is:
The beneficial effects of the utility model are as follows:
The utility model utilizes two resistance-type displacement meters to measure respectively vertical deformation and the transversely deforming of the soil body, thereby extrapolates the Poisson ratio of the soil body.Solve the difficult problem of surveying of soil's Poisson ratio by contributing to, measure in this way in addition soil's Poisson ratio more simple and more accurate than pasting foil gauge.
Brief description of the drawings
Fig. 1 concrete structure figure of the present utility model;
In figure: the tested earth pillar of the 1 top board 2 lower platen 3 flexible thin steel ring little collar 6 benchmark support 7 of 4 resistance-type displacement meter I5,8 resistance-type displacement meter I.
Embodiment
The utility model is by thin steel ring, resistance-type displacement meter, benchmark support and pressing machine combine, measure respectively vertical deformation and the transversely deforming of the soil body with two resistance-type displacement meters, thereby extrapolate the Poisson ratio of the soil body, its version as shown in drawings, comprise the top board 1 that is placed on tested earth pillar 7 tops, be placed on the lower platen 2 of tested earth pillar 7 bottoms and be sleeved on the flexible thin steel ring 3 on tested earth pillar outer ring, one of the lateral surface bonding of described flexible thin steel ring 3 is measured the resistance-type displacement meter I4 of soil body transversely deforming, be provided with a resistance-type displacement meter II8 who measures soil body vertical deformation in the bottom of described top board.Resistance-type displacement meter I4 connects a collar; The described collar is sleeved on benchmark support 6.Resistance-type displacement meter II8 is fixed on benchmark support 6.Resistance-type displacement meter II8 tip leans against on the top board of pressing machine 1.Top board 1, lower platen 2 are all positioned on pressing machine, and top board provides downward pressure to tested earth pillar.Benchmark support 6 is arranged on lower platen.
Concrete method of testing is as follows:
(1) the about 40cm of preparation a slice flexible thin steel disc is long, 1cm is wide, be made into shape as shown in drawings, and itself and resistance-type displacement meter are bonded together, and the little collar that bonds on this resistance-type displacement meter, prepare again a resistance-type displacement meter, and the prefabricated support of benchmark as shown in drawings.
(2) ready made benchmark support is fixed on the lower platen of pressing machine.
(3) make cylindrical tested earth pillar, for subsequent use after moulding.
(4) the thin steel ring that is fixed with resistance-type displacement meter is placed on right cylinder test specimen, and be placed on pressing machine lower platen, time resistance-type displacement meter little cover be located on benchmark support, another resistance-type displacement meter is fixed on benchmark support, resistance-type displacement meter tip is leaned against on pressing machine top board.
(5) opening pressure machine, makes its compression specimens, records the variable quantity of resistance-type displacement meter in soil body compression process, until damage of soil body.
(6) according to the Poisson ratio of the formula calculating soil body;
Within the scope of elastic properties of materials, x wire strain stress
horizontalwith vertical strain stress
perpendicularratio be a constant, the absolute value of its ratio is the Poisson ratio of material, conventionally represents with μ,
When by this utility model measurement device soil's Poisson ratio, due to the compression of pressing machine to tested earth pillar, make tested earth pillar produce vertical displacement, this displacement is by the resistance-type displacement meter record at pressing machine top board place, this value is designated as Δ h, former tested earth pillar height is designated as h, and the vertical strain of tested earth pillar is
the vertical strain of test specimen will inevitably cause the distortion that the soil body is horizontal, and this value, by the resistance-type displacement meter record that is positioned at tested earth pillar position, is designated as Δ l, and the diameter of former tested earth pillar is designated as d, and the transverse strain of tested earth pillar is
the Poisson ratio that can obtain thus tested earth pillar is
Survey the Poisson ratio of a cohesive soil in laboratory, the water cut that records this cohesive soil before experiment is 31%, be made into the right cylinder of high 20cm, diameter 10cm with mould, after moulding, be placed under this utility model device and survey its Poisson ratio, the vertical displacement that records this test specimen is 28.056mm, transversal displacement is 21.154mm, and the Poisson ratio that calculates this cohesive soil by above-mentioned formula is 0.48.
Claims (7)
1. calculate the device of soil's Poisson ratio for one kind, it is characterized in that: comprise be placed on tested earth pillar top top board, be placed on the lower platen of tested earth pillar bottom and be sleeved on the flexible steel ring on tested earth pillar outer ring, one of the lateral surface bonding of described flexible steel ring is measured the sensor I of soil body transversely deforming, is provided with a sensor II who measures soil body vertical deformation in the bottom of described top board.
2. the device of measuring and calculating soil's Poisson ratio as claimed in claim 1, is characterized in that: described sensor I connects a collar; The described collar is sleeved on benchmark support.
3. the device of measuring and calculating soil's Poisson ratio as claimed in claim 1, is characterized in that: described sensor II is fixed on benchmark support.
4. the device of measuring and calculating soil's Poisson ratio as claimed in claim 1, is characterized in that: described sensor I, sensor II are resistance-type displacement meter.
5. the device of measuring and calculating soil's Poisson ratio as claimed in claim 1, is characterized in that: described sensor II tip leans against on the top board of pressing machine.
6. the device of measuring and calculating soil's Poisson ratio as claimed in claim 1, is characterized in that: described top board, lower platen are all positioned on pressing machine, and top board provides downward pressure to tested earth pillar.
7. the device of measuring and calculating soil's Poisson ratio as claimed in claim 2, is characterized in that: described benchmark support is connected with lower platen, is arranged on the side of top board and lower platen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420306358.2U CN203929511U (en) | 2014-06-10 | 2014-06-10 | A kind of device of calculating soil's Poisson ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420306358.2U CN203929511U (en) | 2014-06-10 | 2014-06-10 | A kind of device of calculating soil's Poisson ratio |
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| Publication Number | Publication Date |
|---|---|
| CN203929511U true CN203929511U (en) | 2014-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420306358.2U Expired - Fee Related CN203929511U (en) | 2014-06-10 | 2014-06-10 | A kind of device of calculating soil's Poisson ratio |
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| CN (1) | CN203929511U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983516A (en) * | 2014-06-10 | 2014-08-13 | 山东大学 | Device and method for measuring and calculating poisson ratio of soil body |
-
2014
- 2014-06-10 CN CN201420306358.2U patent/CN203929511U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983516A (en) * | 2014-06-10 | 2014-08-13 | 山东大学 | Device and method for measuring and calculating poisson ratio of soil body |
| CN103983516B (en) * | 2014-06-10 | 2017-02-15 | 山东大学 | Method for measuring and calculating poisson ratio of soil body |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141105 Termination date: 20150610 |
|
| EXPY | Termination of patent right or utility model |