CN208254460U - The distribution type fiber-optic measuring system of dam body tunneling boring settlement monitoring - Google Patents
The distribution type fiber-optic measuring system of dam body tunneling boring settlement monitoring Download PDFInfo
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- CN208254460U CN208254460U CN201820891695.0U CN201820891695U CN208254460U CN 208254460 U CN208254460 U CN 208254460U CN 201820891695 U CN201820891695 U CN 201820891695U CN 208254460 U CN208254460 U CN 208254460U
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Abstract
The distribution type fiber-optic measuring system of dam body tunneling boring settlement monitoring: the distribution type fiber-optic measuring system of dam body tunneling boring settlement monitoring, the system is arranged in the intracorporal monitoring ditch in rock dam, it is characterized in monitoring and is equipped with the fashioned iron isometric with monitoring ditch in ditch, fashioned iron is fixed with two strain sensing optical fiber in parallel up and down；Two strain sensing optical fiber pass through connection optical cable incoming fiber optic detecting instrument.Fashioned iron uses H-shaped fashioned iron or C-shaped fashioned iron, is welded into whole be placed on and monitors inside ditch.Optical fiber is the flexible shroud optical fiber of diameter 4-6mm.The system of the utility model has very high measurement accuracy using the measurement method settled inside distribution type fiber-optic measurement rock, is the useful supplement of settlement monitoring technology inside rock, and can solve sedimentation and deformation problem inside high CFRD.
Description
Technical field
The utility model belongs to rock monitoring technical field；More particularly to a kind of dam body tunneling boring settlement monitoring
Distribution type fiber-optic measuring system.
Background technique
Domestic and international rock inside sinking deformation monitoring generallys use the measurement sedimentation of " waterpipe type " settlement gauge and becomes at present
The method of shape.This method is in the monitoring elevation of dam filing to design code, under being from upstream to inside dam in advance
Monitoring pipeline of the trip setting one perpendicular to the axis of dam, Embedded installation " waterpipe type " settlement gauge is vertical to measure in this pipeline
Deformation.It can only be a point inside this installation " waterpipe type " settlement gauge measurement rock the case where sedimentation and deformation variation,
The measurement of one point is unable to reach distributed measurement.And increase with height of dam, the pipeline of " waterpipe type " settlement gauge is with nearly 3 times
Height of dam it is synchronous increase, will seriously affect its sedimentation packet, water level balance in water pipe line and its measuring system, lead to " waterpipe type "
There is technical difficulty in sedimentation and deformation inside settlement gauge measurement high CFRD.
The Distributed Optical Fiber Sensing Techniques of rising in recent years have the characteristics that waterproof, anticorrosive and durability are long, sensing
Component size is small, light-weight, and measurement range is wide, convenient for being laid with installation, is implanted into monitoring object the problem of there is no matchings,
It is smaller on influences such as the performance of monitoring object and mechanics parameters；Optical fiber itself is both sensing element and signal transmission medium, can
It realizes and the remote distributed of monitoring object is monitored.Distributed sensing fiber is affixed directly to the upper bottom wing of H profile steel or C-type steel
Edge, when rock inside sedimentation and deformation occurs, the H profile steel or C-type steel being embedded in inside rockfill are with rock heap
Stone body is synchronous to occur sedimentation and deformation, and the Differential settlement deformation along H profile steel or C-type steel length direction will lead in H profile steel or C-type steel
Lower flange is stretched and compresses respectively, so that the sensor fibre for being pasted on lower flange in H profile steel or C-type steel be driven to be stretched and press
Contracting, the strain measurement precision of existing distribution type fiber-optic technology is up to 1 μ ε (microstrain), and spatial resolution can reach 1cm, high
Strain measurement precision and high spatial resolution can accurately measure the sensor fibre for being pasted on lower flange in H profile steel or C-type steel
Be stretched and compress formed strain deformation, according to measure be pasted on lower flange in H profile steel or C-type steel sensor fibre stretch and
The difference of compressive deformation can calculate to obtain dam body internal diversity sedimentation in constituent parts length range, and the difference calculation method of use can
The measured value of sensor fibre is influenced with directly eliminating temperature change and the displacement of dam body inner horizontal, with Embedment and installation in panel enrockment
H profile steel or C-type steel inside dam are reference point in downstream dam slope leading point, and the sedimentation of unit measurement difference in length is cumulative one by one
It is calculated within the scope of rock interior span and is distributed using the sedimentation and deformation that 1cm measures length as minimum unit, and can survey
Measure the inside sedimentation and deformation of rock profile and lateral.By taking height is the H profile steel or C-type steel of 20cm as an example, using the technology
The settlement measurement precision of its 1m unit length is 0.01mm/m, and 300m grades of its vertical section maximum of rock measurement length are about
1000m, using the inside distribution sedimentation and deformation of this method measurement length 1000m vertical section, synthesis in theory error is mm grades.
Therefore there is very high measurement accuracy using the measurement method settled inside distribution type fiber-optic measurement rock, is panel enrockment
The useful supplement of settlement monitoring technology inside dam, and sedimentation and deformation problem inside high CFRD can be solved.
Summary of the invention
Technical problems to be solved needed for the utility model are, solve sedimentation and deformation problem inside high CFRD,
A kind of distribution type fiber-optic measuring system of dam body tunneling boring settlement monitoring is provided.The system is simple and easy, and cost is very low, is adapted to
Any rock sedimentation deformation measurement, especially high long rock, and automatic measurement may be implemented.
To reach above-mentioned purpose, the utility model proposes a kind of measurements of the distribution type fiber-optic of dam body tunneling boring settlement monitoring
System, the system are arranged in the intracorporal monitoring ditch in rock dam, which is characterized in that are equipped in the monitoring ditch and monitoring ditch
Isometric fashioned iron, the fashioned iron are fixed with two strain sensing optical fiber in parallel up and down；Two strain sensing optical fiber pass through connection
Optical cable incoming fiber optic detecting instrument.
The fashioned iron can use H-shaped fashioned iron or C-shaped fashioned iron；The H-shaped fashioned iron or C-shaped fashioned iron are to be welded into one whole to put
Inside monitoring ditch.
The optical fiber is the flexible shroud optical fiber of diameter 4-6mm.
Fixed form between two strain sensing optical fiber and fashioned iron is: using epoxy resin as adhesive with cementation method
Sensor fibre is securely cemented on the upper and lower interior edge of a wing of H-shaped fashioned iron or C-shaped fashioned iron, makes whole, a guarantee sense light
It is fine consistent with the compatibility of deformation on the edge of a wing interior above and below H-shaped fashioned iron or C-shaped fashioned iron.
Set-up mode of the fashioned iron in monitoring ditch is: monitoring ditch bottom of trench flattens as required, and fills out one layer of fines；
Whole H-shaped fashioned iron or C-shaped fashioned iron fines are buried, manually grinding compacting, cal rolling can just be used by filling 1 meter or more
It is closely knit.
Using H-shaped fashioned iron of the Embedment and installation inside rock or C-shaped fashioned iron in downstream dam slope leading point as reference point.
The implementation method of the distribution type fiber-optic measuring system of above-mentioned dam body tunneling boring settlement monitoring, comprising the following steps:
1) CFRD Embankment to design code monitoring elevation when, under being from upstream to inside rock in advance
Monitoring ditch of the trip setting one perpendicular to the axis of dam, monitoring ditch flatten as required and fill out one layer of fines.
2) H-shaped fashioned iron or C-shaped fashioned iron is installed inside monitoring ditch, the H-shaped fashioned iron or C-shaped fashioned iron install after with being fully welded
H-shaped fashioned iron or C-shaped fashioned iron are welded into whole be placed on and monitored inside ditch by mode；Sedimentation deformation occurs inside rock
When, drive H-shaped fashioned iron or C-shaped fashioned iron to deform to drive lower flange position sensing optical fiber on H-shaped fashioned iron or C-shaped fashioned iron
Strain changes.
3) whole H-shaped fashioned iron or C-shaped fashioned iron surface are subjected to cleaning treatment, it is interior above and below whole H-shaped fashioned iron or C-shaped fashioned iron
Two strain sensing optical fiber are laid on the edge of a wing in parallel, and use epoxy resin as adhesive with cementation method by the secured glue of sensor fibre
It ties on the upper and lower interior edge of a wing of H-shaped fashioned iron or C-shaped fashioned iron, makes whole, guarantee sensor fibre and H profile steel or a C-type steel
The compatibility of deformation on the edge of a wing is consistent in up and down.
4) H-shaped fashioned iron or C-shaped fashioned iron are lain in into monitoring ditch fines surface.
5) after being installed, whole H-shaped fashioned iron or C-shaped fashioned iron fines are buried, manually grinding compacting, fills 1
Meter or more just can with cal rolling it is closely knit.
6) sensor fibre docks and accesses the fiber laser arrays instrument in observation room with optical cable is connect, using current state-of-the-art
Distributed Optical Fiber Sensing Techniques measure the H-shaped fashioned iron of deformation synchronous with rock or strain, the deformation data of C-shaped fashioned iron,
Distributed Optical Fiber Sensing Techniques can realize automatic measurement.The strain data that analysis measurement is calculated using integration method, to count
Calculation obtains sedimentation and deformation characteristic inside tested rock.
Measurement method described in the utility model is to lay two in parallel in the upper lower flange of H-shaped fashioned iron or C-shaped fashioned iron
Strain sensing optical fiber measures sedimentation deformation inside rock.It is accurately measured by high-precision distribution type fiber-optic measuring technique
The sensor fibre for being pasted on lower flange on H-shaped fashioned iron or C-shaped fashioned iron out be stretched and compress formed strain deformation, the difference of use
Value calculating method, which can directly eliminate temperature change and the displacement of dam body inner horizontal, influences the measured value of sensor fibre, according to measuring
The sensor fibre for being pasted on lower flange on H-shaped fashioned iron or C-shaped fashioned iron stretches and the difference of compressive deformation can calculate to obtain constituent parts
Dam body internal diversity settles in length range, with H-shaped fashioned iron of the Embedment and installation inside rock or C-shaped fashioned iron in downstream
Dam slope leading point is reference point, and the strain data of analysis measurement is calculated using integration method, heavy inside rock to calculate
Drop can be calculated within the scope of rock interior span and is distributed using the sedimentation and deformation that 1cm measures length as minimum unit.
Fashioned iron described in the utility model is H-shaped fashioned iron or C-shaped fashioned iron, using the rigidity of H-shaped fashioned iron or C-shaped fashioned iron and its
The globality formed after weld utilizes its wing plate width and rigidity to realize its sedimentation and deformation synchronous with rockfill around
The sensor fibre for pasting lower flange on it is protected；The sensor fibre is the flexible sensing optical fiber of 4~6mm diameter.
In other words, the working principle of the present apparatus is:
Measurement accuracy using current advanced distribution type fiber-optic measuring technique is high (measurement accuracy reaches as high as 1 μ ε), point
Cloth measures (mono- measuring point of minimum 1cm), measures strong antijamming capability, measures distance, realizes and settles position to rock
The rapidly and accurately measurement moved is a kind of innovation measurement method of rock sedimentation deformation measurement.The utility model is using H
A strain sensing optical fiber is respectively laid in lower flange on fashioned iron or C-type steel, and two strain sensing optical fiber are arranged parallel, and passes through meter
The strain difference for calculating lower flange sensor fibre in unit length H profile steel or C-type steel calculates the relative settlement of its unit length, to bury
If the H profile steel or C-type steel that are mounted on inside rock are reference point in downstream dam slope leading point, calculated using integration method
The strain data of measurement is analyzed, to calculate sedimentation inside rock, to measure within the scope of rock interior span
The sedimentation and deformation distribution of length is measured using 1cm as minimum unit.By taking height is the H profile steel or C-type steel of 20cm as an example, using the skill
The settlement measurement precision of its 1m unit length of art is 0.01mm/m, and 300m grades of its vertical section maximum of rock measurement length are about
For 1000m, using the inside distribution sedimentation and deformation of this method measurement length 1000m vertical section, synthesis in theory error is mm
Grade.
The H profile steel of sedimentation and deformation or C-type steel surface inside rock will be measured and carry out cleaning treatment, in whole H-type
Interior flange surfaces lay strain sensing optical fiber in parallel up and down for the center on the interior edge of a wing of steel or C-type steel, and are made with epoxy resin
With cementation method sensor fibre is securely cemented in for adhesive on the interior edge of a wing of H profile steel or C-type steel, is allowed to integral, protected
It is consistent with the compatibility of deformation on the edge of a wing of H profile steel or C-type steel to demonstrate,prove sensor fibre, installs the H profile steel or C-type steel of strain sensing optical fiber
It is embedded in monitored rock after being handled using reasonable safeguard measure.After being installed, by whole H profile steel or c-type
Steel is buried with fines, manually grinding compacting, and filling 1 meter or more just can be closely knit with cal rolling.Sensor fibre is accessed
Fiber laser arrays instrument measures the H-type of deformation synchronous with rock using state-of-the-art Distributed Optical Fiber Sensing Techniques at present
The strain of steel or C-type steel, deformation data, Distributed Optical Fiber Sensing Techniques can realize automatic measurement, be calculated using integration method
Analyze the strain data of measurement.When settling inside rock rockfill, H profile steel or C-type steel therein are buried therewith
Synchronous sedimentation and deformation, causes lower flange in H profile steel or C-type steel to be stretched and compress respectively, is pasted on corresponding positions with epoxy resin
The strain sensing optical fiber set, which will synchronize, to be stretched and compresses, in unit of account length at lower flange strain sensing optical fiber strain differential
Value can calculate unit length H profile steel or the curved variation of C-type steel, pass through bottom wing in unit of account length H profile steel or C-type steel
The strain difference of edge sensor fibre calculates the relative settlement of its unit length, with H-type of the Embedment and installation inside rock
Steel or C-type steel are reference point in downstream dam slope leading point, calculate the strain data of analysis measurement, using integration method to calculate face
Sedimentation inside sheetpile masonry dam measures the heavy of length by minimum unit of 1cm to measure within the scope of rock interior span
Drop deformation distribution.
By above the technical solution of the utility model it is found that the monitoring method of the utility model and monitoring system are using distribution
The devices and methods therefor of sedimentation and deformation inside formula optical fiber measurement rock, by being surface-treated clean H profile steel or c-type
The upper lower flange inner surface of steel cements sensor fibre, epoxy resin and H profile steel or C-type steel wing plate and plays guarantor to strain sensor fibre
Shield effect, whole H profile steel or C-type steel are mounted in tested rock monitoring ditch, and are filled fines and buried H profile steel or C
Fashioned iron, manually grinding compacting, uses fiber laser arrays instrument to measure the sensor fibre of Embedded installation to realize that monitoring is surveyed
Strain, the deformation data of the H profile steel or C-type steel of deformation synchronous with rock are measured, Distributed Optical Fiber Sensing Techniques can be realized
Automatic measurement calculates the strain data of analysis measurement using integration method, so that rock sedimentation deformation be calculated
Deformation characteristic.
The utility model has the effect that
1, the distribution type fiber-optic measuring system and method for dam body tunneling boring settlement monitoring, the processing is simple for this method structure, side
Just it installs, simple and easy to do, at low cost, measurement accuracy meets actual measurement of engineering needs；
2, measured using inner surface cementing sensor fibre in lower flange in H profile steel or C-type steel H profile steel or C-type steel up and down
Surface strain strains difference and can calculate H profile steel or c-type within the scope of unit length by calculating H profile steel or C-type steel upper and lower surface
The amount of bow of steel is disappeared to calculate H profile steel or C-type steel both ends relative settlement value within the scope of unit length using difference arithmetic
Except temperature change and H profile steel or C-type steel stretch the influence to strain sensor fibre measured value, panel enrockment is calculated using integration method
Sedimentation deformation inside dam, to measure the sedimentation for measuring length within the scope of rock interior span using 1cm as minimum unit
Deformation distribution.
3, the application field of distributed fiber grating sensing technology measurement is extended.
Detailed description of the invention
Fig. 1 is structural representation of the utility model using sedimentation monitoring system inside distribution type fiber-optic measurement rock
Figure；
Fig. 2 is the H profile steel fiber arrangement structural schematic diagram of the utility model；
Fig. 3 is the C-type steel fiber arrangement structural schematic diagram of the utility model.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and specifically
Case study on implementation is described in further detail the utility model method.Specific implementation case described herein is only to explain
The utility model is not used to limit the utility model.
The distribution type fiber-optic measuring system and method for dam body tunneling boring settlement monitoring are for inside monitoring panel rock-fill dams
Deformation.On the whole, the utility model passes through the lower flange inner surface glue on being surface-treated clean H profile steel or C-type steel
Strain sensing optical fiber is tied, whole H profile steel or C-type steel are mounted in tested rock monitoring ditch, and it is embedded to fill fines
Good H profile steel or C-type steel, manually grinding compacting, use fiber laser arrays instrument to the sensor fibre of Embedded installation measure with
Realize that monitoring measures the strain of the H profile steel or C-type steel of deformation synchronous with rock, deformation data, distributing optical fiber sensing
Technology can realize automatic measurement, the strain data of analysis measurement be calculated using integration method, so that tested panel be calculated
Rock-fill dams internal modification characteristic.When settling inside rock rockfill, H profile steel or C-type steel therein are buried therewith
Synchronous sedimentation and deformation, causes lower flange in H profile steel or C-type steel to be stretched and compress respectively, is pasted on corresponding positions with epoxy resin
The strain sensing optical fiber set, which will synchronize, to be stretched and compresses, in unit of account length at lower flange strain sensing optical fiber strain differential
Value can calculate unit length H profile steel or the curved variation of C-type steel, pass through bottom wing in unit of account length H profile steel or C-type steel
The strain difference of edge sensor fibre calculates the relative settlement of its unit length, with H-type of the Embedment and installation inside rock
Steel or C-type steel are reference point in downstream dam slope leading point, calculate the strain data of analysis measurement, using integration method to calculate face
Sedimentation inside sheetpile masonry dam measures the heavy of length by minimum unit of 1cm to measure within the scope of rock interior span
Drop deformation distribution.
Embodiment 1: the distribution type fiber-optic measuring system and method for dam body tunneling boring settlement monitoring, referring to Fig.1, and Fig. 2, face
Plate Rockfill Dam to design code monitoring elevation when, be from upstream to inside dam in advance downstream be arranged one perpendicular to dam
The monitoring ditch of axis, monitoring ditch flatten as required and fill out one layer of fines.H profile steel 1 is installed inside monitoring ditch, which is placed on
It monitors inside ditch, it is whole that all H profile steels 1 mode being fully welded is welded into one；When being settled inside rock, band
Dynamic H profile steel 1 deforms that the strain of two edge of a wing inner surface center sensor fibres 2 is driven to change.By whole H-type
1 surface of steel carries out cleaning treatment, lays two strain sensings in parallel in the upper lower flange inner surface center of whole H profile steel 1
Optical fiber 2, and epoxide-resin glue 5 used as adhesive be securely cemented in sensor fibre 2 with cementation method the upper bottom wing of H profile steel 1
It on edge inner surface, is allowed to integral, guarantees that sensor fibre 2 is consistent with the compatibility of deformation on the edge of a wing of H profile steel 1.Biography will be cemented
Photosensitive fine 2 H profile steel 1 is installed in monitored rock monitoring ditch.After being installed, whole H profile steel 1 is buried with fines
If good, manually grinding compacting, filling 1 meter or more just can be closely knit with cal rolling.Sensor fibre 2 docks simultaneously with optical cable is connect
The fiber laser arrays instrument 3 in access observation room 4 passes through measurement sensor fibre using current state-of-the-art Distributed Optical Fiber Sensing Techniques
Strain the strain of lower flange, deformation data, distributing optical fiber sensing in the H profile steel 1 to measure deformation synchronous with rock
Technology can realize automatic measurement, the strain data of analysis measurement be calculated using integration method, so that tested panel be calculated
Sedimentation and deformation characteristic inside rock-fill dams.The utility model is respectively to lay a strain sensing using lower flange inner surface in H profile steel 1
Optical fiber 2, two strain sensing optical fiber 2 are arranged parallel, and pass through lower flange sensor fibre 2 in unit of account length H profile steel 1
Strain difference calculates the relative settlement of its unit length, with H profile steel 1 of the Embedment and installation inside rock in downstream dam slope
Leading point is reference point, and the strain data of analysis measurement is calculated using integration method, to calculate sedimentation inside rock, from
And it measures within the scope of rock interior span and is distributed using the sedimentation and deformation that 1cm measures length as minimum unit.
Embodiment 2: the distribution type fiber-optic measuring system and method for dam body tunneling boring settlement monitoring, referring to Fig. 3, dam body breaks entirely
The distribution type fiber-optic measuring system and method for face settlement monitoring, it is substantially the same manner as Example 1, the difference is that sensor fibre 2
Securely it is cemented in C-type steel 6.The optical fiber is the flexible shroud optical fiber of diameter 4-6mm.
Claims (6)
1. a kind of distribution type fiber-optic measuring system of dam body tunneling boring settlement monitoring, which is arranged in rock dam body
Monitoring ditch in, which is characterized in that be equipped in the monitoring ditch and be fixed in parallel up and down with the isometric fashioned iron of monitoring ditch, the fashioned iron
Two strain sensing optical fiber；Two strain sensing optical fiber pass through connection optical cable incoming fiber optic detecting instrument.
2. the distribution type fiber-optic measuring system of dam body tunneling boring settlement monitoring according to claim 1, which is characterized in that institute
The fashioned iron stated uses H-shaped fashioned iron or C-shaped fashioned iron；The H-shaped fashioned iron or C-shaped fashioned iron are to be welded into whole be placed on to monitor inside ditch.
3. the distribution type fiber-optic measuring system of dam body tunneling boring settlement monitoring according to claim 1, which is characterized in that institute
The optical fiber stated is the flexible shroud optical fiber of diameter 4-6mm.
4. the distribution type fiber-optic measuring system of dam body tunneling boring settlement monitoring according to claim 1, which is characterized in that two
Fixed form bar between strain sensing optical fiber and fashioned iron is: use epoxy resin as adhesive with cementation method by sensor fibre
It is securely cemented on the upper and lower interior edge of a wing of fashioned iron, makes whole a, change on the interior edge of a wing above and below guarantee sensor fibre and fashioned iron
Shape is harmonious.
5. the distribution type fiber-optic measuring system of dam body tunneling boring settlement monitoring according to claim 1, which is characterized in that institute
Set-up mode of the fashioned iron stated in monitoring ditch is: monitoring ditch bottom of trench flattens as required, and fills out one layer of fines；By whole fashioned iron
It is buried with fines, manually grinding compacting, filling 1 meter or more just can be closely knit with cal rolling.
6. the distribution type fiber-optic measuring system of dam body tunneling boring settlement monitoring described in one of -5 according to claim 1, feature
Be, using fashioned iron of the Embedment and installation inside rock in downstream dam slope leading point as reference point.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108562267A (en) * | 2018-06-06 | 2018-09-21 | 水利部交通运输部国家能源局南京水利科学研究院 | The distribution type fiber-optic measuring system and method for dam body tunneling boring settlement monitoring |
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2018
- 2018-06-06 CN CN201820891695.0U patent/CN208254460U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108562267A (en) * | 2018-06-06 | 2018-09-21 | 水利部交通运输部国家能源局南京水利科学研究院 | The distribution type fiber-optic measuring system and method for dam body tunneling boring settlement monitoring |
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