CN207081510U - 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 PDF

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Publication number
CN207081510U
CN207081510U CN201720862668.6U CN201720862668U CN207081510U CN 207081510 U CN207081510 U CN 207081510U CN 201720862668 U CN201720862668 U CN 201720862668U CN 207081510 U CN207081510 U CN 207081510U
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China
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connector
elastomer
pore water
negative
water pressure
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CN201720862668.6U
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Chinese (zh)
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王莹
朱昌亚
曾永菊
王小龙
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General Engineering Research Institute China Academy of Engineering Physics
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General Engineering Research Institute China Academy of Engineering Physics
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Abstract

The utility model discloses a kind of miniature positive/negative-pressure measurement pore water pressure sensor, including capillary ceramic plate, elastomer, foil gauge, connector, breather pipe and connecting 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, connecting cable electrically connects 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 utility model 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 changes, and realized by passage using atmospheric pressure as reference pressure, realize positive/negative pressure measurement.

Description

A kind of miniature positive/negative-pressure measurement pore water pressure sensor
Technical field
It the utility model is related 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, water pressure is separated and measured from the total earth pressure of measurement.The measurement of pore water pressure, to studying the soil body Deformation and Strength Changes important in inhibiting, it 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 The product of malleation and can side negative pressure can be surveyed.But in some important soil tests, such as the measuring point meeting in frozen soil and clay experiment The transformation of positive/negative-pressure be present, it is therefore desirable to a kind of pore water pressure sensor that can realize 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 relation Model is established》In, using piezoresistive pressure sensor as pressure responsive element, pass through the permeable choke after micropore ceramics cylinder water infiltration Effect, make the water column that a transmission pressure is established between pressure sensor and soil, and use air guide cable, made a positive and negative The pore water pressure sensor of pressure measxurement, realizes the measurement of positive/negative pressure, and such a pore water pressure sensor is suitable for Flush type measures, but because its volume is larger, is unsuitable for measuring in multimetering and centrifugal model.
Utility model content
The purpose of this utility model is that to solve the above problems and provides a kind of miniature positive/negative-pressure measurement pore water Pressure sensor.
The utility model 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 connecting cable, the elastomer are that middle-end is provided with the cylinder of circular iris, the upper end of the elastomer with it is described The lower end of connector is fixedly connected, and cavity, the foil gauge are provided between the downside of the connector and the circular iris The upper side of the circular iris is fitted in, the cavity passes through the breather pipe and atmosphere through the connector, institute State connecting cable to electrically connect with the foil gauge through the connector, the capillary ceramic plate is fixed under the elastomer End is internal, and gap is provided between the capillary ceramic plate and the circular iris.
Specifically, the upper end of the connector is fixedly installed rear sealing cover, is provided with the connector for fixing The connection end daughter board of the breather pipe and the connecting cable.
Preferably, the thickness of the capillary ceramic plate be more than between the circular iris and the lower surface of the elastomer away from From.
Specifically, the circumference of the capillary ceramic plate and the medial surface of the elastomer, the upper side of the connector, institute State between connector and the connection end daughter board, between the breather pipe and the connector and the rear sealing cover, the company Connect and be provided with waterproof gasket cement between cable and the connector and the rear sealing cover.
Specifically, laser is passed through between the elastomer and the connector, between the bonnet and the connector Welded seal connects.
Specifically, the permeability of the capillary ceramic plate is consistent with surveyed soil body void permeabilities.
The beneficial effects of the utility model are:
A kind of miniature positive/negative-pressure measurement pore water pressure sensor of the utility model utilizes miniature rigid circular iris measurement pressure The principle of power, and using the filter structure of the permeable choke of micropore ceramics consistent with soil body pore permeability making, as far as possible mould Intend the pore water pressure force environment in the true soil body, the change of accurate measurement pore water pressure, and realized by passage with atmospheric pressure Masterpiece is reference pressure, realizes positive/negative pressure measurement.
Brief description of the drawings
Fig. 1 is a kind of structural representation of miniature positive/negative-pressure measurement pore water pressure sensor described in the utility model;
Fig. 2 is a kind of partial enlargement signal of miniature positive/negative-pressure measurement pore water pressure sensor described in the utility model Figure.
Embodiment
The utility model is described in further detail 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 utility model, including micropore Ceramic wafer 10, elastomer 7, foil gauge 8, connector 5, breather pipe 1 and connecting 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 are 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 is fixedly installed rear sealing cover 3, use is provided with connector 5 In fixed breather pipe 1 and the connection end daughter board 6 of connecting cable 2, the thickness of capillary ceramic plate 10 is more than circular iris and elastomer 7 The distance between lower surface, circumference and the medial surface of elastomer 7, the upper side of connector 5, the connector 5 of capillary ceramic plate Between connection end daughter board 6, between breather pipe 1 and connector 5 and rear sealing cover 3, after connecting cable 2 and connector 5 and sealing Waterproof gasket cement 4 is provided between lid 3, passes through Laser Welding between elastomer 7 and connector 5, between bonnet and connector 5 Sealed connection is connect, 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 utility model is as follows:
Sensor uses circular iris pressure measxurement structure, and the filter structure that permeable choke is used as by capillary ceramic plate 10 is real When transmit soil body Pore Pressure change, passage realize using atmospheric pressure as pressure reference, by installed in diaphragm Pore water pressure is converted to electric signal and measured by the foil gauge 8 on piece.
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 delivery 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, foil gauge 8 sense the radial strain deformation of circular iris, pass through favour stone Full-bridge circuit measures, so as to by pressure signal it is proportional be converted to electric signal, accurate measurement pressure change.
The lead of strain gauge of sensor 8 and connecting cable 2 by the through hole on connector 5 and connection end daughter board 6 by being carried out Interconnection, and form 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, sensor entirety using miniature circular iris Density is suitable with soil body density, and physical dimension is small can be used for centrifugal model test.
(2) permeable choke, real simulation soil body pore water flow regime are realized using porous ceramic filtering plate structure.
(3) use miniature breather pipe 1 to realize the positive/negative-pressure measure of the change using atmospheric pressure as pressure reference, improve measurement Precision.
(4) connecting, being fixed and overall for structural member of sensor is realized by the way of welding and waterproof gasket cement 4 combine Sealing, meet 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;Filter structure simulates true soil test Pore water pressure flow regime, overall structure size is small, studies for geotechnical model test, is tried especially by geo- textile technique Test means progress soil structures research and provide effective means.
The technical solution of the utility model is not limited to the limitation of above-mentioned specific embodiment, every according to skill of the present utility model The technology deformation that art scheme is made, each falls within the scope of protection of the utility model.

Claims (6)

  1. A kind of 1. 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 connecting 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 connects, and the connecting cable electrically connects 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 2. 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 is fixedly installed rear sealing cover, is provided with the connector for fixing the breather pipe and the connection electricity The connection end daughter board of cable.
  3. A kind of 3. 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 4. miniature positive/negative-pressure measurement pore water pressure sensor according to claim 2, it is characterised in that:It is described micro- The circumference of hole ceramic wafer 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 connecting cable and the connector and Waterproof gasket cement is provided between the rear sealing cover.
  5. A kind of 5. 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 6. 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.
CN201720862668.6U 2017-07-17 2017-07-17 A kind of miniature positive/negative-pressure measurement pore water pressure sensor Active CN207081510U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201720862668.6U CN207081510U (en) 2017-07-17 2017-07-17 A kind of miniature positive/negative-pressure measurement pore water pressure sensor

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Application Number Priority Date Filing Date Title
CN201720862668.6U CN207081510U (en) 2017-07-17 2017-07-17 A kind of miniature positive/negative-pressure measurement pore water pressure sensor

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CN207081510U true CN207081510U (en) 2018-03-09

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107238461A (en) * 2017-07-17 2017-10-10 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
CN108729430A (en) * 2018-04-23 2018-11-02 河海大学 A kind of silting blocking type hole pressure meter and application method
CN109001421A (en) * 2018-05-30 2018-12-14 西南交通大学 A kind of soil pressure and monitoring pore water pressure device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107238461A (en) * 2017-07-17 2017-10-10 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
CN108729430A (en) * 2018-04-23 2018-11-02 河海大学 A kind of silting blocking type hole pressure meter and application method
CN109001421A (en) * 2018-05-30 2018-12-14 西南交通大学 A kind of soil pressure and monitoring pore water pressure device

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