CN208588487U - A kind of soil body three-dimensional stress measuring device based on optical fiber sensing technology - Google Patents
A kind of soil body three-dimensional stress measuring device based on optical fiber sensing technology Download PDFInfo
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- CN208588487U CN208588487U CN201821155020.6U CN201821155020U CN208588487U CN 208588487 U CN208588487 U CN 208588487U CN 201821155020 U CN201821155020 U CN 201821155020U CN 208588487 U CN208588487 U CN 208588487U
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Abstract
The utility model relates to a kind of measuring devices that can be used for measuring stress caused by the self weights such as side slope, ground or load, belong to resistance to shear of soil the field of test technology.A kind of soil body three-dimensional stress measuring device based on optical fiber sensing technology, including pressure-sensitive hollow cavity, the pressure-sensitive hollow cavity is polyhedron, through slot is provided between relative or neighbor rib, for installing fixed built-in beam in the through slot, built-in beam inner surface is used to paste the optical fiber grating sensing element for incuding external soil pressure；Pressure-sensitive hollow cavity outer surface is provided with pressure-sensitive liquid capsule, the pressure-sensitive liquid capsule gives optical fiber grating sensing element for transmitting soil pressure；The optical fiber grating sensing element is connected by optical fiber with external fiber Bragg grating (FBG) demodulator.The utility model has the advantage that the direction of 1. pressure-sensitive has polytropism.2. can still keep its adaptability when large deformation occurs for the soil body.3. improving the precision of measurement.4. low manufacture cost, applied widely.
Description
Technical field
The utility model relates to a kind of measurement dresses that can be used for measuring stress caused by the self weights such as side slope, ground or load
It sets, and in particular to the measuring device of the stress intensity on measurement three directions of the soil body belongs to resistance to shear of soil the field of test technology.
Background technique
Often because under external force or heavy rainfall effect, the stress and soil strength of inside soil body occur slope instability
Change, causes gradually to generate crack inside side slope, eventually lead to collapsing for side slope.And resistance to shear of soil is then reflection side slope, ground
One important parameter of equal soil stabilizations state, the size and its distribution for measuring soil stress have important theoretical research and
Practical engineering value, while also having the effects that instruct engineering design, operation maintenance.
Since there is many defects for the electric signal measurements such as traditional resistance-type, piezomagnetic, type vibration wire device, such as in thunderstorm
The stress state variation that seriously can not accurately measure the soil body is disturbed under weather or strong magnetic field circumstance, or because of measurement direction
Unicity is unable to measure the stress state of soil body all directions, in addition, majority resistance to shear of soil sensor can not be pasted with the soil body at present
Close it is closely knit, so causing measurement accuracy not accurate enough.Fiber grating have high temperature resistant, not by electromagnetic interference, small in size, precision is high
The features such as, can under harsh working environment normal service, well instead of some traditional electric measuring type sensors.
Utility model content
The purpose of this utility model is to solve problems of the prior art, provide it is a kind of it is adaptable, precision is high, system
Make the soil body three-dimensional stress measuring device at low cost, applied widely based on optical fiber sensing technology.
To achieve the goals above, the utility model adopts the following technical solution: a kind of soil based on optical fiber sensing technology
Body three-dimensional stress measuring device, including pressure-sensitive hollow cavity, the pressure-sensitive hollow cavity is polyhedron, in relative or neighbor rib
Between be provided with through slot, for installing fixed built-in beam in the through slot, built-in beam inner surface incudes external soil pressure for pasting
The optical fiber grating sensing element of power；Pressure-sensitive hollow cavity outer surface is provided with pressure-sensitive liquid capsule, the pressure-sensitive liquid capsule is for transmitting
Soil pressure gives optical fiber grating sensing element；The optical fiber grating sensing element passes through optical fiber and external fiber Bragg grating (FBG) demodulator phase
Even.
It further, further include temperature compensation optical fiber grating, the temperature compensation optical fiber grating, which is pasted on, to be arranged in pressure-sensitive
Not not stressing on beam inside hollow cavity；Do not stress one end of beam is articulated on pressure-sensitive hollow cavity, and the other end is free end.
Preferably, the pressure-sensitive hollow cavity is regular hexahedron.
Preferably, the through slot is set to the middle part of opposite rib, and the both ends of built-in beam are individually fixed on rib.
Preferably, baltimore groove is respectively and fixedly provided on six faces of regular hexahedron, the baltimore groove is for installing fixed pressure-sensitive
Liquid capsule.
When test, the wavelength values of optical fiber grating sensing element are first read under static(al) state, are recorded under static(al) state
Wavelength data drills at tested slight slope or ground, it is hole to be drilled to depths to be measured when, first fill out one layer about in hole bottom
Then this measuring device is placed in hole, connects the pressure-sensitive liquid capsule towards lower convexity sufficiently with bottom fine sand by the fine sand of 5cm thickness
Touching, then carries out backfill processing, wait backfill it is closely knit after start to carry out data record to the optic fiber grating wavelength under working condition.Work
When, the soil body transmits soil pressure, the liquid in liquid capsule is sealed after coming into full contact with the soil body by coming into full contact with pressure-sensitive liquid capsule surface
Pressure is passed to the built-in beam in polyhedron pressure-sensitive hollow cavity under the action of soil pressure by body medium, and built-in beam is under pressure
And deform, the deformation of built-in beam is so that the central wavelength for being pasted onto the optical fiber grating sensing element of built-in beam inner surface occurs
Variation can be obtained by the strain value of built-in beam generation by the variation of records center wavelength, to obtain the deformation of built-in beam
Amount, then according to the Stress displacement formula of built-in beam under Uniform Load, can calculate and act on being evenly distributed on built-in beam
Load, this evenly load can be considered soil pressure.It, can be with because pressure-sensitive hollow cavity is provided with multiple built-in beams
Measure six soil pressure changing values at least three axis of orientations.To prevent temperature bring wave length shift, to temperature-compensating light
Grid carry out wavelength data reading, reject the influence of temperature on fiber grating sensing element measurement resistance to shear of soil.
The utility model has the advantage that
1. the direction of pressure-sensitive has polytropism, the soil pressure size on multiple and different directions can be incuded, improve biography
System electrometric sensor can only measure the deficiency of single direction soil pressure.
2. the induction shell of liquid bag type can be bonded closely with the soil body, the stress of soil body transmitting is adequately incuded, in the soil body
Occur still keep its adaptability when large deformation.
3. the advantage of optical fiber grating sensing element, improve traditional electrometric sensor can not work normally in the presence of a harsh environment
The shortcomings that, improve the precision of measurement.
4. low manufacture cost, applied widely.
Detailed description of the invention
Fig. 1 is the utility model embodiment structural schematic diagram；
Fig. 2 is pressure-sensitive hollow cavity structural schematic diagram in the utility model embodiment；
Fig. 3 is the sectional view of Fig. 1；
In figure, 1, regular hexahedron pressure-sensitive hollow cavity；2, pressure-sensitive liquid capsule；3, optical fiber grating sensing element；4, temperature-compensating
Fiber grating；5, do not stress beam；6, optical fiber is drawn；7, baltimore groove；8, fixing bolt；9, articulated stand；10, built-in beam.
Specific embodiment
1-3 is further described the utility model with reference to the accompanying drawing: a kind of soil body three based on optical fiber sensing technology
To stress measurement device, including 1, six pressure-sensitive liquid capsule 2 of a regular hexahedron pressure-sensitive hollow cavity, optical fiber grating sensing element 3,
Temperature compensation optical fiber grating 4, draws optical fiber 6, baltimore groove 7, fixing bolt 8, articulated stand 9, built-in beam 10 at the beam 5 that do not stress.Just
Hexahedron pressure-sensitive hollow cavity 1 is cast with stainless steel, and six faces form through slot, for fixed solid by processing reserved interlude
End carriage 10, built-in beam is for pasting optical fiber grating sensing element 3；Optical fiber grating sensing element 3 is bonded in using epoxy resin
Built-in beam inner surface on 1 six faces of regular hexahedron pressure-sensitive hollow cavity, for incuding the external soil for passing through pressure-sensitive liquid capsule 2 and transmitting
Pressure after optical fiber grating sensing component affixing is good, is connected them with optical fiber one by one, then by drawing optical fiber and external light
Fine grating demodulation instrument is connected, and reads monitoring data.
In order to reduce influence of the temperature to monitoring data, the diagonally cloth in regular hexahedron pressure-sensitive hollow cavity 1
If the beam 5 that do not stress, it is used for sticking temperature compensated optical fiber grating 4,5 one end of beam that do not stress to be hinged by articulated stand 9, another
End is free end.Because the variation of temperature will lead to the drift of optic fiber grating wavelength, a temperature-compensating grating need to be arranged,
To guarantee that temperature-compensating grating does not stress, temperature-compensating grating is pasted onto diagonally overhead do not stress on beam.
For fixed and installation pressure-sensitive liquid capsule 2, need that spill is installed on six faces of hexahedron pressure-sensitive hollow cavity 1 in advance
Slot 7, baltimore groove is cast by stainless steel, and baltimore groove fixing bolt 8 and regular hexahedron pressure-sensitive hollow cavity 1 are fixed, wherein perpendicular
To reserving hole is provided between two baltimore grooves in direction, draws optical fiber 6 and pass through the reserving hole and external fiber grating solution
Instrument is adjusted to be connected, optical fiber is drawn hole and is embedded in rubber ring, and optical fiber is protected not cut at work by baltimore groove.It is installed to baltimore groove
After good, pressure-sensitive liquid capsule 2 is embedded in baltimore groove, to prevent pressure-sensitive liquid capsule from occurring at work mobile or falling off, uses epoxy resin
Pressure-sensitive liquid capsule and the stickup of baltimore groove surrounding is firm.
Implementation process: first reading optic fiber grating wavelength numerical value using fiber Bragg grating (FBG) demodulator under statical condition, right later
Slight slope or ground carry out drilling processing, when hole gets into depth to be measured, first fill out the fine sand of one layer of about 5cm thickness in hole bottom,
Then this measuring device is placed in hole, comes into full contact with the pressure-sensitive liquid capsule towards lower convexity with bottom fine sand, then backfilled
Processing, wait backfill it is closely knit after start under working condition optic fiber grating wavelength carry out data record.When work, the soil body by with
Pressure-sensitive liquid capsule surface comes into full contact with, and transmits soil pressure, after coming into full contact with the soil body, the liquid medium in pressure-sensitive liquid capsule is in soil pressure
Pressure (may be considered evenly load here) is passed into the built-in beam on regular hexahedron pressure-sensitive hollow cavity under the action of power,
The built-in beam on regular hexahedron pressure-sensitive hollow cavity is set to deform, the deformation of built-in beam is so that be pasted onto the optical fiber of beam inner surface
Grating sensing element central wavelength changes, and can be obtained by the strain value of built-in beam by the variation of records center wavelength,
By calculating the deformation values it can be concluded that built-in beam, i.e. beam disturbs angle value.Then using Uniform Load on built-in beam
Degree of disturbing formula can calculate the evenly load acted on built-in beam, this evenly load may be considered soil pressure.For
Temperature bring wave length shift is prevented, wavelength data reading is carried out to temperature compensation optical fiber grating, rejects temperature on fiber grating
The influence of sensing element measurement resistance to shear of soil.It the optical fiber grating sensing element pasted on built-in beam and pastes on the beam that do not stress
They can be cascaded by temperature compensation optical fiber grating by connection optical fiber, finally by extraction optical fiber and fiber grating solution
It adjusts instrument to be connected, carries out reading data.Because there are six built-in beams for the setting of pressure-sensitive hollow cavity, some point three of the soil body can be measured
Six soil pressure changing values on a axis of orientation, two pressure values on each axis of orientation can be averaged, can thus obtain
Obtain the soil body three-dimensional stress value situation of change of some point of some depth of the soil body.
Above-described embodiment is only preferred embodiments of the present invention, and the selection of pressure-sensitive hollow cavity can be according to reality
Border environmental requirement is set, however it is not limited to the regular hexahedron in embodiment.Those of ordinary skill in the art are in the utility model
On the basis of done any amplification, deformation it is within the protection scope of the present utility model.
Claims (5)
1. a kind of soil body three-dimensional stress measuring device based on optical fiber sensing technology, including pressure-sensitive hollow cavity, it is characterised in that:
The pressure-sensitive hollow cavity is polyhedron, and through slot is provided between relative or neighbor rib, is used to install in the through slot solid
Determine built-in beam, built-in beam inner surface is used to paste the optical fiber grating sensing element for incuding external soil pressure；In pressure-sensitive hollow cavity
Outer surface is provided with pressure-sensitive liquid capsule, and the pressure-sensitive liquid capsule gives optical fiber grating sensing element for transmitting soil pressure；The optical fiber light
Grid sensing element is connected by optical fiber with external fiber Bragg grating (FBG) demodulator.
2. the soil body three-dimensional stress measuring device according to claim 1 based on optical fiber sensing technology, it is characterised in that: also
Including temperature compensation optical fiber grating, the temperature compensation optical fiber grating, which is pasted on, is arranged in not stressing inside pressure-sensitive hollow cavity
Liang Shang；Do not stress one end of beam is articulated on pressure-sensitive hollow cavity, and the other end is free end.
3. the soil body three-dimensional stress measuring device according to claim 1 or 2 based on optical fiber sensing technology, feature exist
In: the pressure-sensitive hollow cavity is regular hexahedron.
4. the soil body three-dimensional stress measuring device according to claim 3 based on optical fiber sensing technology, it is characterised in that: institute
The middle part that through slot is set to opposite rib is stated, the both ends of built-in beam are individually fixed on rib.
5. the soil body three-dimensional stress measuring device according to claim 3 based on optical fiber sensing technology, it is characterised in that:
Baltimore groove is respectively and fixedly provided on six faces of regular hexahedron, the baltimore groove is for installing fixed pressure-sensitive liquid capsule.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821155020.6U CN208588487U (en) | 2018-07-20 | 2018-07-20 | A kind of soil body three-dimensional stress measuring device based on optical fiber sensing technology |
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| CN201821155020.6U CN208588487U (en) | 2018-07-20 | 2018-07-20 | A kind of soil body three-dimensional stress measuring device based on optical fiber sensing technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110424362A (en) * | 2019-09-05 | 2019-11-08 | 南京工业大学 | A kind of optical fiber type temperature self-compensation static sounding sensor |
| CN112629735A (en) * | 2020-12-10 | 2021-04-09 | 西南交通大学 | Three-dimensional soil pressure measuring device for model test and using method thereof |
-
2018
- 2018-07-20 CN CN201821155020.6U patent/CN208588487U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110424362A (en) * | 2019-09-05 | 2019-11-08 | 南京工业大学 | A kind of optical fiber type temperature self-compensation static sounding sensor |
| CN110424362B (en) * | 2019-09-05 | 2024-02-13 | 南京工业大学 | Optical fiber type temperature self-compensating static sounding sensor |
| CN112629735A (en) * | 2020-12-10 | 2021-04-09 | 西南交通大学 | Three-dimensional soil pressure measuring device for model test and using method thereof |
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