CN204630830U - Soil body kinetic parameter and anisotropy analyzer under a kind of K0 condition - Google Patents
Soil body kinetic parameter and anisotropy analyzer under a kind of K0 condition Download PDFInfo
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- CN204630830U CN204630830U CN201520348908.1U CN201520348908U CN204630830U CN 204630830 U CN204630830 U CN 204630830U CN 201520348908 U CN201520348908 U CN 201520348908U CN 204630830 U CN204630830 U CN 204630830U
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- soil
- model casing
- piezoelectric sensor
- anisotropy
- soil body
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The utility model provides soil body kinetic parameter and anisotropy analyzer under a kind of K0 condition, it comprises charger and model casing for providing load, described model casing is covered by the cavity volume for depositing soil to be measured and openable chamber and forms, described charger covers with the chamber of model casing and is connected, the horizontal direction of described model casing and vertical direction are respectively equipped with the piezoelectric sensor for detecting soil shear modulus to be measured and modulus in compression, the horizontal direction of described model casing and vertical direction are also provided with the pressure film sensor of horizontal earth pressure for detecting soil to be measured and vertical soil pressure, the installation place of described piezoelectric sensor and model casing arranges cushion pad, described chamber covers the dependent variable pick-up unit be also provided with for detecting soil STRESS VARIATION amount to be measured, the utility model improves the mechanical response that the soil body measures modulus accuracy and KO state, easy to operate, fiduciary level is high.
Description
Technical field
The utility model relates to the apparatus and method of a kind of soil body basic mechanical parameter and Evolution Microstructure, particularly relates to soil body kinetic parameter and anisotropy analyzer under a kind of K0 condition.
Background technology
The maximum dynamic shear modulus of sand and dynamic modulus in compression are the most basic two parameters of soil dynamics, that Geotechnical Engineering calculates and the very important basic parameter of design aspect, and different soil body particles also experiencings the evolution of micromechanism under different load actions, and this serial procedures is in the design of infrastructure with under lab must obtain and determine quantitative analysis before building, for future engineering construction and operation in security and the raising of permanance strong guarantee is provided.At present, in domestic Geotechnical Engineering laboratory experiment, measure maximum dynamic shear modulus and usually obtain with Resonant Column experiment, due to the restriction of Resonant Column itself, the maximum dynamic shear modulus of acquisition that first it can not be real and dynamic modulus in compression, had experiment to prove; Secondly under it can not ensure that experiment sample is in K0 condition, so stress state native under the condition that can not truly reflect reality; Finally because Resonant Column experimentation is very loaded down with trivial details, and the operation of the experimenter needing experience to enrich very much could obtain reliable data.
Utility model content
In order to overcome above technical deficiency, the purpose of this utility model is to provide the analyzer that soil body basic motive mathematic(al) parameter and Soil Microstructure develop under a kind of indoor test K0 state, is applicable to cohesive soil and non-cohesive soil.
The utility model provides soil body kinetic parameter and anisotropy analyzer under a kind of K0 condition, it comprises charger and model casing for providing load, described model casing is covered by the cavity volume for depositing soil to be measured and openable chamber and forms, described charger covers with the chamber of model casing and is connected, the horizontal direction of described model casing and vertical direction are respectively equipped with the piezoelectric sensor for detecting soil shear modulus to be measured and modulus in compression, the horizontal direction of described model casing and vertical direction are also provided with the pressure film sensor of horizontal earth pressure for detecting soil to be measured and vertical soil pressure, the installation place of described piezoelectric sensor and model casing arranges cushion pad, described chamber covers the dependent variable pick-up unit be also provided with for detecting soil STRESS VARIATION amount to be measured.
Described piezoelectric sensor is flexure element piezoelectric sensor, and it comprises the vibration transmitter and vibration receiver that are positioned at two ends, the external computing machine of described piezoelectric sensor.
Described cushion pad is between the outer wall of model casing and the installation portion of piezoelectric sensor.
Described cavity volume is made up of the aluminium sheet that five pieces are detachably installed.
Described aluminium sheet is provided with the mounting groove for installing piezoelectric sensor, and described piezoelectric sensor is fixedly connected with through mounting groove.
Cushion pad is provided with between the part of described piezoelectric sensor outside cavity volume and cavity volume outer wall.
Described piezoelectric sensor is positioned at the position parcel epoxy resin layer of cavity volume inside.
Described cushion pad is that silica gel material is made.
The width of described chamber lid is less than the width of cavity volume.
The beneficial effects of the utility model are: install two pairs of piezoelectric sensors in the inside of model casing, be arranged on horizontal direction and vertical direction respectively, measure modulus of shearing and modulus in compression; And stick pressure film sensor in the horizontal direction of model casing and vertical direction, measure horizontal earth pressure and vertical soil pressure, and obtain the evolution of K0 value; Model casing top is that charger is with control with in size.The utility model provides the model structure needed for the calculating of the modulus of shearing of the level of the soil body of K0 state and vertical direction, modulus in compression and Poisson ratio, obtain along with the increase of load can obtain the change of soil body particle micromechanism in this process further, the utility model improves the mechanical response that the soil body measures modulus accuracy and K0 state, easy to operate, fiduciary level is high.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model embodiment is described further:
As shown in Figure 1, the utility model provides soil body kinetic parameter and anisotropy analyzer under a kind of K0 condition, it comprises charger and model casing for providing load, described model casing is covered by the cavity volume for depositing soil to be measured and openable chamber and forms, described charger covers with the chamber of model casing and is connected, the horizontal direction of described model casing and vertical direction are respectively equipped with the piezoelectric sensor for detecting soil shear modulus to be measured and modulus in compression, the horizontal direction of described model casing and vertical direction are also provided with the pressure film sensor 1 of horizontal earth pressure for detecting soil to be measured and vertical soil pressure, described piezoelectric sensor 2 arranges cushion pad 3 with the installation place of model casing, described chamber covers the dependent variable pick-up unit 4 be also provided with for detecting soil STRESS VARIATION amount to be measured.
The width of described chamber lid is less than the width of cavity volume, in the effect of the pressure that charger provides, when placing sand to be measured in cavity volume, its chamber is covered under the effect of charger, move down, then sand to be measured is pressurizeed, and which is provided with dependent variable pick-up unit, model casing top is that charger is with control load size, and dependent variable pick-up unit may be used for the change of record axial strain amount, charger can use pneumatic means, air pressure is utilized to oppress chamber lid, dependent variable pick-up unit is made to detect dependent variable change in real time, charger also can provide the device of pressure with other.
Stick pressure film sensor in the horizontal direction of model casing and vertical direction, measure horizontal earth pressure and vertical soil pressure, and obtain the evolution of K0 value:
wherein σ
hfor horizontal earth pressure, σ
vfor vertical earth pressure.
Described piezoelectric sensor is the T220-A4-303Y flexure element piezoelectric sensor of Piezo System company, and it comprises the vibration transmitter and vibration receiver that are positioned at two ends, the external computing machine of described piezoelectric sensor.Two pairs of piezoelectric sensors are installed in the inside of model casing, are arranged on horizontal direction and vertical direction respectively, measure modulus of shearing and modulus in compression.
The evolution of micromechanism is obtained according to following steps:
(1) G
ij=V
ijs 2ρ, wherein G is modulus of shearing, and V is shear wave velocity, and i represents the direction of vibration of soil particle, and j represents direction of wave travel;
(2)
wherein M is elastic modulus, and V is compression velocity of wave, and j represents direction of wave travel;
(3)
wherein υ is Poisson ratio, and the meaning of i, j is identical with formula (1)
By above-mentioned calculating, formula (4), can obtain the evolution parameter FI of micromechanism.
(4)
FI is group structure index, and represent the evolution of micromechanism, the horizontal transmission of ripple represents with H, vertically represents with V, and following meaning is identical.
Then formula (5) or (6) are utilized anisotropic index a can be gone out by inverse,
The utility model provides the model structure needed for the calculating of the modulus of shearing of the level of the soil body of K0 state and vertical direction, modulus in compression and Poisson ratio, obtains further along with the increase of load can obtain the change of soil body particle micromechanism in this process.
Described cushion pad is between the outer wall of model casing and the installation portion of piezoelectric sensor.
Described cavity volume is made up of the aluminium sheet that five pieces are detachably installed, and the rigidity aluminium sheet that model casing is 2cm by 5 dismountable thickness forms, to ensure that the soil body is under K0 state; What chamber was covered is beneficial to free loading compared with the worn-out young 1mm of model casing.
Described aluminium sheet is provided with the mounting groove for installing piezoelectric sensor, and described piezoelectric sensor is fixedly connected with through mounting groove.The aluminium sheet that model casing is relative gets out mounting groove to install flexure element piezoelectric sensor, two pairs of flexure element piezoelectric sensor surface evenly must be coated with epoxy resin, reach waterproof and corrosion-resistant effect, and silica gel to be coated with to reach vibration isolation between aluminium sheet and sensor when stationary curved unit piezoelectric sensor, vibration transmitter is launched according to the direction of pre-determined route.Used as cushion pad by silica gel, can avoid the resonance vibrating transmitter generation that model casing is vibrated, impact detects the accuracy of data simultaneously.
The surface smear epoxy resin of described pressure film sensor, plays waterproof and corrosion-resistant effect, avoids sensor to contact with soil to be measured the corrosion caused for a long time.
Embodiment should not be considered as restriction of the present utility model, but any improvement done based on spirit of the present utility model, all should within protection domain of the present utility model.
Claims (9)
1. soil body kinetic parameter and anisotropy analyzer under a K0 condition, it is characterized in that: it comprises charger and model casing for providing load, described model casing is covered by the cavity volume for depositing soil to be measured and openable chamber and forms, described charger covers with the chamber of model casing and is connected, the horizontal direction of described model casing and vertical direction are respectively equipped with the piezoelectric sensor for detecting soil shear modulus to be measured and modulus in compression, the horizontal direction of described model casing and vertical direction are also provided with the pressure film sensor of horizontal earth pressure for detecting soil to be measured and vertical soil pressure, the installation place of described piezoelectric sensor and model casing arranges cushion pad, described chamber covers the dependent variable pick-up unit be also provided with for detecting soil STRESS VARIATION amount to be measured.
2. soil body kinetic parameter and anisotropy analyzer under a kind of K0 condition according to claim 1, it is characterized in that, described piezoelectric sensor is flexure element piezoelectric sensor, and it comprises the vibration transmitter and vibration receiver that are positioned at two ends, the external computing machine of described piezoelectric sensor.
3. soil body kinetic parameter and anisotropy analyzer under a kind of K0 condition according to claim 1, it is characterized in that, described cushion pad is between the outer wall of model casing and the installation portion of piezoelectric sensor.
4. soil body kinetic parameter and anisotropy analyzer under a kind of K0 condition according to claim 1, is characterized in that, described cavity volume is made up of the aluminium sheet that five pieces are detachably installed.
5. soil body kinetic parameter and anisotropy analyzer under a kind of K0 condition according to claim 4, it is characterized in that, described aluminium sheet is provided with the mounting groove for installing piezoelectric sensor, and described piezoelectric sensor is fixedly connected with through mounting groove.
6. soil body kinetic parameter and anisotropy analyzer under a kind of K0 condition according to claim 5, is characterized in that, is provided with cushion pad between the part of described piezoelectric sensor outside cavity volume and cavity volume outer wall.
7. soil body kinetic parameter and anisotropy analyzer under a kind of K0 condition according to claim 1,2,5 or 6, is characterized in that, described piezoelectric sensor is positioned at the position parcel epoxy resin layer of cavity volume inside.
8. soil body kinetic parameter and anisotropy analyzer under a kind of K0 condition according to claim 1, it is characterized in that, described cushion pad is that silica gel material is made.
9. soil body kinetic parameter and anisotropy analyzer under a kind of K0 condition according to claim 1, is characterized in that, the width of described chamber lid is less than the width of cavity volume.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520348908.1U CN204630830U (en) | 2015-05-26 | 2015-05-26 | Soil body kinetic parameter and anisotropy analyzer under a kind of K0 condition |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520348908.1U CN204630830U (en) | 2015-05-26 | 2015-05-26 | Soil body kinetic parameter and anisotropy analyzer under a kind of K0 condition |
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|---|---|
| CN204630830U true CN204630830U (en) | 2015-09-09 |
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|---|---|---|---|
| CN201520348908.1U Expired - Fee Related CN204630830U (en) | 2015-05-26 | 2015-05-26 | Soil body kinetic parameter and anisotropy analyzer under a kind of K0 condition |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104880366A (en) * | 2015-05-26 | 2015-09-02 | 温州大学瓯江学院 | Soil body kinetic parameter and anisotropy tester under K0 condition |
-
2015
- 2015-05-26 CN CN201520348908.1U patent/CN204630830U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104880366A (en) * | 2015-05-26 | 2015-09-02 | 温州大学瓯江学院 | Soil body kinetic parameter and anisotropy tester under K0 condition |
| CN104880366B (en) * | 2015-05-26 | 2018-01-16 | 温州大学瓯江学院 | Evolution Microstructure method based on soil body kinetic parameter and anisotropy analyzer under the conditions of K0 |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150909 Termination date: 20180526 |