CN107238461A - A kind of miniature positive/negative-pressure measurement pore water pressure sensor - Google Patents
A kind of miniature positive/negative-pressure measurement pore water pressure sensor Download PDFInfo
- Publication number
- CN107238461A CN107238461A CN201710579115.4A CN201710579115A CN107238461A CN 107238461 A CN107238461 A CN 107238461A CN 201710579115 A CN201710579115 A CN 201710579115A CN 107238461 A CN107238461 A CN 107238461A
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- connector
- elastomer
- pore water
- negative
- water pressure
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- 239000011148 porous material Substances 0.000 title claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 238000009530 blood pressure measurement Methods 0.000 title claims abstract description 20
- 239000000919 ceramic Substances 0.000 claims abstract description 28
- 229920001971 elastomer Polymers 0.000 claims abstract description 27
- 239000000806 elastomer Substances 0.000 claims abstract description 27
- 239000002689 soil Substances 0.000 claims abstract description 18
- 239000011888 foil Substances 0.000 claims abstract description 13
- 230000035699 permeability Effects 0.000 claims abstract description 8
- 238000007789 sealing Methods 0.000 claims description 10
- 239000004568 cement Substances 0.000 claims description 4
- 239000011800 void material Substances 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 11
- 238000011160 research Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000000649 photocoagulation Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
- G01L7/02—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges
- G01L7/08—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges of the flexible-diaphragm type
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The invention discloses a kind of miniature positive/negative-pressure measurement pore water pressure sensor, including capillary ceramic plate, elastomer, foil gauge, connector, breather pipe and connection cable, elastomer is the cylinder that middle-end is provided with circular iris, the upper end of elastomer is fixedly connected with the lower end of connector, cavity is provided between the downside of connector and circular iris, foil gauge is fitted in the upper side of circular iris, cavity passes through breather pipe and atmosphere, connection cable is electrically connected through connector with foil gauge, capillary ceramic plate is fixed on inside the lower end of elastomer, gap is provided between capillary ceramic plate and circular iris.The present invention measures the principle of pressure using circular iris, and the filter structure of permeable choke is made using micropore ceramics consistent with soil body pore permeability, the pore water pressure force environment in the true soil body is simulated as far as possible, accurate measurement pore water pressure change, and realized by passage using atmospheric pressure as reference pressure, realize positive/negative pressure measurement.
Description
Technical field
The present invention relates to pressure tester, more particularly to a kind of miniature positive/negative-pressure measurement pore water pressure sensor.
Background technology
Pore water pressure sensor (also referred to as pore pressure gauge or osmometer) is a kind of for measuring soil aperture hydraulic pressure
The instrument of power, from the total earth pressure of measurement separates water pressure and measure.The measurement of pore water pressure, to research soil
Body is deformed and Strength Changes important in inhibiting, is a kind of conventional method of soil-structure interactions Research on Mechanical Properties.
In the product of pore water pressure sensor existing standard, distinguished substantially with surveying malleation and surveying negative pressure, not one
Malleation can be surveyed and the product of energy side negative pressure.But in some important soil tests, the measuring point in such as frozen soil and clay experiment
There can be the transformation of positive/negative-pressure, it is therefore desirable to a kind of to realize the pore water pressure sensor of positive/negative-pressure measurement.
The Feng Cangxu of Agricultural University Of Hebei is in its Master's thesis《The experimental study of soil pore water pressure detecting system and pass
It is that model is set up》In, using piezoresistive pressure sensor as pressure responsive element, by permeable after micropore ceramics cylinder water infiltration
Choke effect, makes the water column that a transmission pressure is set up between pressure sensor and soil, and uses air guide cable, has made one
The pore water pressure sensor of money positive/negative pressure measurement, realizes the measurement of positive/negative pressure, and such a pore water pressure sensor is fitted
Share in flush type measurement, but because its volume is larger, be unsuitable for measuring in multimetering and centrifugal model.
The content of the invention
The purpose of the present invention, which is that, provides a kind of miniature positive/negative-pressure measurement pore water pressure in order to solve the above problems
Sensor.
The present invention is achieved through the following technical solutions above-mentioned purpose：
A kind of miniature positive/negative-pressure measurement pore water pressure sensor, including capillary ceramic plate, elastomer, foil gauge, connection
Body, breather pipe and connection cable, the elastomer are the cylinder that middle-end is provided with circular iris, the upper end of the elastomer and institute
The lower end for stating connector is fixedly connected, and cavity, the strain are provided between the downside of the connector and the circular iris
Piece is fitted in the upper side of the circular iris, the cavity by the breather pipe and atmosphere through the connector,
The connection cable is electrically connected through the connector with the foil gauge, and the capillary ceramic plate is fixed on the elastomer
Lower end inside, be provided with gap between the capillary ceramic plate and the circular iris.
Specifically, the upper end of the connector, which is fixedly installed on rear sealing cover, the connector, is provided with for fixing
The connection end daughter board of the breather pipe and the connection cable.
Preferably, the thickness of the capillary ceramic plate is more than between the circular iris and the lower surface of the elastomer
Distance.
Specifically, the medial surface of the circumference of the micro-control ceramic cup and the elastomer, the upper side of the connector,
Between the connector and the connection end daughter board, between the breather pipe and the connector and the rear sealing cover, it is described
Waterproof gasket cement is provided between connection cable and the connector and the rear sealing cover.
Specifically, between the elastomer and the connector, laser is passed through between the bonnet and the connector
Welded seal is connected.
Specifically, the permeability of the capillary ceramic plate is consistent with surveyed soil body void permeabilities.
The beneficial effects of the present invention are：
A kind of miniature positive/negative-pressure measurement pore water pressure sensor of the present invention utilizes miniature rigid circular iris measurement pressure
Principle, and using the filter structure of the permeable choke of micropore ceramics consistent with soil body pore permeability making, simulate as far as possible true
Pore water pressure force environment in the real soil body, accurate measurement pore water pressure change, and realized by passage with atmospheric pressure masterpiece
For reference pressure, positive/negative pressure measurement is realized.
Brief description of the drawings
Fig. 1 is the structural representation that a kind of miniature positive/negative-pressure of the present invention measures pore water pressure sensor.
Fig. 2 is the close-up schematic view that a kind of miniature positive/negative-pressure of the present invention measures pore water pressure sensor.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings：
As depicted in figs. 1 and 2, a kind of miniature positive/negative-pressure measurement pore water pressure sensor of the present invention, including micropore ceramics
Plate 10, elastomer 7, foil gauge 8, connector 5, breather pipe 1 and connection cable 2, elastomer 7 are that middle-end is provided with circular iris
Cylinder, the upper end of elastomer 7 is fixedly connected with the lower end of connector 5, is provided between the downside of connector 5 and circular iris
Cavity, foil gauge 8 is fitted in the upper side of circular iris, and cavity passes through the breather pipe 1 and atmosphere through connector 5, connection
Cable 2 is electrically connected through connector 5 with foil gauge 8, and capillary ceramic plate 10 is fixed on inside the lower end of elastomer 7, micropore ceramics
Gap is provided between plate 10 and circular iris, the upper end of connector 5, which is fixedly installed on rear sealing cover 3, connector 5, to be provided with
Connection end daughter board 6 for fixing breather pipe 1 and connection cable 2, the thickness of capillary ceramic plate 10 is more than circular iris and elastomer
The distance between 7 lower surface, the circumference of micro-control ceramic cup and the medial surface of elastomer 7, the upper side of connector 5, connector
Between 5 and connection end daughter board 6, between breather pipe 1 and connector 5 and rear sealing cover 3, connection cable 2 and connector 5 and sealing
Waterproof gasket cement 4 is provided between bonnet 3, by swashing between elastomer 7 and connector 5, between bonnet and connector 5
Photocoagulation is tightly connected, and the permeability of capillary ceramic plate 10 is consistent with surveyed soil body void permeabilities.
A kind of operation principle of miniature positive/negative-pressure measurement pore water pressure sensor of the present invention is as follows：
Sensor uses circular iris pressure measxurement structure, passes through filter structure of the capillary ceramic plate 10 as permeable choke
The change of transmission soil body Pore Pressure in real time, passage is realized using atmospheric pressure as pressure reference, by installed in circle
Pore water pressure is converted to electric signal and measured by the foil gauge 8 on diaphragm.
Porous ceramic filtering plate, can be with permeable choke, by the pore diameter for controlling capillary ceramic plate 10 after saturation infiltration
And porosity, so as to simulate the flow regime of soil body pore water, realize the real-time transmission of pore water pressure.
It is foil gauge 8 that miniature circular membrane type is pasted on the circular iris of elastomer 7, sensing in real time and by the circular iris of elastomer 7
The pressure conversion of sensing is electric signal, and circular iris bears pressure schematic diagram as shown in Fig. 2 when circular iris bears well-distributed pressure,
The radial strain ε r and tangential strain ε on circular iris surface, the radial strain deformation of the sensing circular iris of foil gauge 8, pass through favour stone
Full-bridge circuit is measured, thus by pressure signal it is proportional be converted to electric signal, accurately measure pressure change.
The lead of strain gauge of sensor 8 and connection cable 2 by the through hole on connector 5 and connection end daughter board 6 by being carried out
Interconnection, and constitute favour stone full bridge measurement circuit.
Overall structure realizes the connection of air and the cavity of elastomer 7 using breather pipe 1, and as reference pressure, and other are tied
It is both needed to ensure waterproof sealing between component.
(1) sensor realizes the integral type measurement for aligning negative pressure pore water pressure using miniature circular iris, and sensor is overall
Density is suitable with soil body density, and physical dimension is small available for centrifugal model test.
(2) permeable choke is realized using porous ceramic filtering plate structure, true simulation soil body pore water flow regime.
(3) use miniature breather pipe 1 to realize the positive/negative-pressure measure of the change using atmospheric pressure as pressure reference, improve survey
Accuracy of measurement.
(4) realize the connecting of structural member of sensor by the way of welding and the combination of waterproof gasket cement 4, it is fixed and whole
Body is sealed, and meets the environmental requirement of pore water pressure measurement.
It is achieved thereby that the integral type measurement of the positive/negative-pressure change of pore water pressure；The true geotechnique's examination of filter structure simulation
Pore water pressure flow regime is tested, overall structure size is small, be geotechnical model test research, especially by geotechnological centrifugal mold
Type research technique carries out soil structures research and provides effective means.
Technical scheme is not limited to the limitation of above-mentioned specific embodiment, every technique according to the invention scheme
The technology deformation made, each falls within protection scope of the present invention.
Claims (6)
1. a kind of miniature positive/negative-pressure measurement pore water pressure sensor, it is characterised in that：Including capillary ceramic plate, elastomer, answer
Become piece, connector, breather pipe and connection cable, the elastomer is the cylinder that middle-end is provided with circular iris, the elastomer
Upper end is fixedly connected with the lower end of the connector, and cavity is provided between the downside of the connector and the circular iris,
The foil gauge is fitted in the upper side of the circular iris, and the cavity is by the breather pipe through the connector and greatly
Gas is connected, and the connection cable is electrically connected through the connector with the foil gauge, and the capillary ceramic plate is fixed on described
Inside the lower end of elastomer, gap is provided between the capillary ceramic plate and the circular iris.
2. a kind of miniature positive/negative-pressure measurement pore water pressure sensor according to claim 1, it is characterised in that：The company
The upper end of junctor, which is fixedly installed on rear sealing cover, the connector, to be provided with for fixing the breather pipe and connection electricity
The connection end daughter board of cable.
3. a kind of miniature positive/negative-pressure measurement pore water pressure sensor according to claim 1, it is characterised in that：It is described micro-
The thickness of hole ceramic wafer is more than the distance between lower surface of the circular iris and the elastomer.
4. a kind of miniature positive/negative-pressure measurement pore water pressure sensor according to claim 2, it is characterised in that：It is described micro-
Control the circumference of ceramic cup and the medial surface of the elastomer, the upper side of the connector, the connector and the connection end
Between daughter board, between the breather pipe and the connector and the rear sealing cover, the connection cable and the connector and
Waterproof gasket cement is provided between the rear sealing cover.
5. a kind of miniature positive/negative-pressure measurement pore water pressure sensor according to claim 2, it is characterised in that：The bullet
Connected between property body and the connector, between the bonnet and the connector by laser welded seal.
6. a kind of miniature positive/negative-pressure measurement pore water pressure sensor according to claim 1, it is characterised in that：It is described micro-
The permeability of hole ceramic wafer is consistent with surveyed soil body void permeabilities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710579115.4A CN107238461A (en) | 2017-07-17 | 2017-07-17 | A kind of miniature positive/negative-pressure measurement pore water pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710579115.4A CN107238461A (en) | 2017-07-17 | 2017-07-17 | A kind of miniature positive/negative-pressure measurement pore water pressure sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107238461A true CN107238461A (en) | 2017-10-10 |
Family
ID=59990619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710579115.4A Pending CN107238461A (en) | 2017-07-17 | 2017-07-17 | A kind of miniature positive/negative-pressure measurement pore water pressure sensor |
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| Country | Link |
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| CN (1) | CN107238461A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110241804A (en) * | 2019-07-18 | 2019-09-17 | 中国地震局工程力学研究所 | A kind of pressure-sensing device, packaging method and ventage piezometer |
| CN115096487A (en) * | 2022-06-17 | 2022-09-23 | 青岛理工大学 | Pressure measuring device and method for soil |
| US20230015393A1 (en) * | 2021-07-13 | 2023-01-19 | Hecate Software, Inc. | Method and system for performing negative pressure tests |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2098845A1 (en) * | 2008-03-08 | 2009-09-09 | Huba Control Ag | Ceramic pressure sensor |
| CN102352620A (en) * | 2011-09-10 | 2012-02-15 | 无锡市政设计研究院有限公司 | Method and device for measuring and monitoring groundwater pressure |
| CN202382900U (en) * | 2011-11-17 | 2012-08-15 | 中国电子科技集团公司第四十八研究所 | Absolute pressure packaging structure for strain pressure transducer and strain pressure transducer |
| CN102879148A (en) * | 2012-10-10 | 2013-01-16 | 基康仪器(北京)有限公司 | Device and method for measuring frozen soil pore water pressure |
| CN207081510U (en) * | 2017-07-17 | 2018-03-09 | 中国工程物理研究院总体工程研究所 | A kind of miniature positive/negative-pressure measurement pore water pressure sensor |
-
2017
- 2017-07-17 CN CN201710579115.4A patent/CN107238461A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2098845A1 (en) * | 2008-03-08 | 2009-09-09 | Huba Control Ag | Ceramic pressure sensor |
| CN102352620A (en) * | 2011-09-10 | 2012-02-15 | 无锡市政设计研究院有限公司 | Method and device for measuring and monitoring groundwater pressure |
| CN202382900U (en) * | 2011-11-17 | 2012-08-15 | 中国电子科技集团公司第四十八研究所 | Absolute pressure packaging structure for strain pressure transducer and strain pressure transducer |
| CN102879148A (en) * | 2012-10-10 | 2013-01-16 | 基康仪器(北京)有限公司 | Device and method for measuring frozen soil pore water pressure |
| CN207081510U (en) * | 2017-07-17 | 2018-03-09 | 中国工程物理研究院总体工程研究所 | A kind of miniature positive/negative-pressure measurement pore water pressure sensor |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110241804A (en) * | 2019-07-18 | 2019-09-17 | 中国地震局工程力学研究所 | A kind of pressure-sensing device, packaging method and ventage piezometer |
| US20230015393A1 (en) * | 2021-07-13 | 2023-01-19 | Hecate Software, Inc. | Method and system for performing negative pressure tests |
| US11940341B2 (en) * | 2021-07-13 | 2024-03-26 | Hecate Software Inc. | Method and system for performing negative pressure tests |
| CN115096487A (en) * | 2022-06-17 | 2022-09-23 | 青岛理工大学 | Pressure measuring device and method for soil |
| CN115096487B (en) * | 2022-06-17 | 2024-02-20 | 青岛理工大学 | Pressure measuring device and method for soil |
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Application publication date: 20171010 |