CN110485403A - The fiber grating cantilevered of a kind of pair of season frozen soil embankment monitoring detects bar - Google Patents
The fiber grating cantilevered of a kind of pair of season frozen soil embankment monitoring detects bar Download PDFInfo
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- CN110485403A CN110485403A CN201910830349.0A CN201910830349A CN110485403A CN 110485403 A CN110485403 A CN 110485403A CN 201910830349 A CN201910830349 A CN 201910830349A CN 110485403 A CN110485403 A CN 110485403A
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- 239000013307 optical fiber Substances 0.000 claims abstract description 12
- 239000004927 clay Substances 0.000 claims abstract description 8
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 13
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/08—Investigation of foundation soil in situ after finishing the foundation structure
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/268—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light using optical fibres
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
- G01K11/3206—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres at discrete locations in the fibre, e.g. using Bragg scattering
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
- G01L1/246—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using integrated gratings, e.g. Bragg gratings
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/10—Miscellaneous comprising sensor means
Landscapes
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Soil Sciences (AREA)
- Analytical Chemistry (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The fiber grating cantilevered of a kind of pair of season frozen soil embankment monitoring detects bar.The present invention is directed to can overcome existing detection method that cannot detect during clay roadbed highway is open to traffic, it more can change depth to measure, it is to be detected using optical fiber Bragg grating sensing technology to strength and stability of the viscous class dirt road dike under the effect of load, temperature and water multi- scenarios method, and this method has good applicability, can the parameters such as deformation displacement to viscous class dirt road dike carry out dynamic detection.On the basis of its sharpest edges is that by the preferable trackability in the soil body and monitoring pipe, the detection of land movement, pressure under can acting on multi- scenarios methods such as load, temperature and water, and do not limited by wet environment.Meanwhile the method terminal that the viscous class dirt road dike of fiber grating pair Han Qu carries out permanent monitoring is very succinct, power is low, real-time, dynamic detection may be implemented, and this method has good applicability, is not limited by unfavorable conditions such as low temperature, humidities.
Description
Technical field
The invention belongs to architectural engineering subgrade settlement field of measuring technique, are related to one kind and are mounted on polyvinyl chloride detection bar
Fiber bragg grating displacement sensor.
Background technique
According to highway quality detection evaluation criteria in 2004, it is desirable that the index master of evaluation embankment soil intensity and stability
Have three, i.e. shear strength, bending tensile strength and compression strength, this requires roadbed i.e. have the characteristics that it is firm, again
It is particularly important and urgently with good durability, therefore for the research of frozen soil highway embankment.Wherein, it is directed to viscosity
It is less for permanent monitoring embankment state this respect research achievement although the research of dirt road dike constantly has new progress.It is viscous
Property penus in one kind of weak soil, and soft soil roadbed harm is low bearing capacity, deformation is big, particularly homogeneous deformation is big, Er Qiebian
The shape stable time is very long, can achieve several years or even decades.So the shape for the highway embankment that monitoring is built on soft soil foundation
State is particularly important for the normal use of highway.
Nowadays, China for frozen soil road evil research still in a primary stage, to frozen earth roadbed middle clay roadbed
Research is even more deeply inadequate.At this stage, it is capable of the main various types sensor of equipment of real-time detection embankment strength and stability.
According to the difference for requiring input physical quantity, sensor can be divided into: displacement sensor, pressure sensor, gas sensor and temperature
Sensor etc., the sensor for being currently used for the detection of the embankment soil body mainly uses electronic sensor, although precision is higher, its
Aging or damage are easy in low temperature and wet environment, so not adapting to the needs of frozen embankment detection.In order to permanently supervise
The differential settlement of road is surveyed, therefore laboratory testing rig designed by this paper selects fiber bragg grating displacement sensor pair
Season, clay embankment in area's cold in nature was monitored.Liang Bo et al. combines Qinghai-Tibet Railway operating condition, has studied various soil mass in the freeze thawing stage
Thaw collapse characteristic, but only qualitative analysis fails to make and accurately differentiates；Su Qian et al. passes through anti-to Qinghai-Tibet Railway slope clay
Multiple Frozen-thawed cycled has shown that Frozen-thawed cycled is big to Effect of soil cohesion, the conclusion small to internal friction, but because of subgrade drainage system
For system it cannot be guaranteed that the objective problems such as unobstructed always, the soil body, which is repeated after Frozen-thawed cycled, has certain error with practical roadbed situation；
Cheng Youkun etc. carries out more tests, significant effect using sandy soil embankment of the fiber bragg grating sensor to Han Qu, but measures classification
It is only limitted to sandy soil, not can solve the measurement problem in clay embankment.In Han Qu, embankment in the long-term use, property
To change with the factors such as load action and water environment, temperature with state, along with Frozen-thawed cycled and heavy-duty vehicle accelerate it is viscous
The breakdown speed of class dirt road dike.If things go on like this, easily there are the safety problems such as differential settlement in clay roadbed, seriously affects road
Normal use, or even jeopardize the life security of the people.Therefore detection Han Qu glues class dirt road dike in load, temperature and water
When under equal multi- scenarios methods effect, the problem of whether stabilized soil pavement can be guaranteed, is extremely urgent, and above-mentioned detection side
Fa highway be open to traffic detect after use want to reach under more field actions in real time, the strength and stability that accurately measures embankment then seems
It is helpless.
Summary of the invention
The present invention is directed to overcome existing detection method that cannot detect during clay roadbed highway is open to traffic,
It more can change depth to measure, be to viscous class dirt road dike using optical fiber Bragg grating sensing technology in load, temperature
Strength and stability under degree and the effect of water multi- scenarios method is detected, and this method has good applicability, can be right
The deformation of viscous class dirt road dike, the parameters such as displacement carry out dynamic detection, and the test method is easy, cheap, precision is high.It passes through
It, can on the basis of optical fiber Bragg grating sensing technology sharpest edges are that by the preferable trackability in the soil body and monitoring pipe
With the detection to land movement, pressure under the effect of the multi- scenarios methods such as load, temperature and water, and not by the limit of wet environment
System.Meanwhile the method terminal that the viscous class dirt road dike of fiber grating pair Han Qu carries out permanent monitoring is very succinct, power is low, Ke Yishi
When real, dynamic detection, and this method have good applicability, do not limited by unfavorable conditions such as low temperature, humidities, the survey
Method for testing is easy, cheap, precision is high.
The present invention be fiber bragg grating displacement sensor is attached on detection pipe carrier (polyvinyl chloride monitoring pipe be
4 meters, selection optical fiber is mono- grating sensing point of every 50cm), road deep layer is embedded in by changing to optic fiber grating wavelength to supervise
Surveying the deformation size of subgrade soils under dynamic loading includes: pavement of road 1., in roadbed each layer filler 2., road foundation
3. Subsidence detection bar polyvinyl chloride outer shell is 4., the inscribed probe of Subsidence detection bar 5., fiber bragg grating displacement sensor 1 6.,
7., 8. polyvinyl chloride detects bar to fiber bragg grating displacement sensor, and detection bar cantilevers beam type fixing end 9., fix by detection pipes
Hold intermediate plate 10. in actual use, soil body vertical displacement, can be by having grasped according to the deformations of detection pipes
Dynamic deformation measurement method and permanent deformation measurement method measure.When roadbed integral sinking, remove through sedimentation pipe institute
The sedimentation of the detection bar fixing end measured still can measure the actual displacement of soil body sedimentation after subgrade settlement.It is needed before test
FBG grating sensor is pasted on monitoring pipe with epoxy resin adhesive, and by packaged monitoring pipe horizontal setting in soil
In body, wherein monitoring pipe one end needs to fix, to make monitoring pipe be reduced to cantilever beam structure, and it is removable to monitor pipe.Test
When, FBG grating horizontal displacement deformation (as detection pipe horizontal distortion) is measured first, then according to cantilever beam structure feature, is answered
With the method for Elasticity, the vertical deformation of testing tube, the as vertical deformation of the soil body is calculated.
Core component is using fiber bragg grating displacement sensor in the present invention, though having precisely, feedback speed is fast
The advantages that, but have to avoid breakage in actual installation process, once it is impaired, the difficulty that it is repaired and is replaced compared with
Height, while can also improve cost.Cantilever beam structure one end need be fixed using stake, and within test period stake elevation
Any variation cannot occur, but since cold area's winter temperature is extremely low, frost heaving easily occurs for the soil body, certainly will influence the height of stake
Journey, therefore, the present invention consider in embedded stake, backfilling material are used as using viscous, to prevent influence of the frost heaving to stake elevation.
The present invention is applied to the larger position of road settlement in architectural engineering, such as the natural subsidence of roadbed, when be applied to compared with
When wide road, two or more such devices should be placed, opposite direction installation can guarantee accurate measurement, still to guarantee the unevenness of road
Even sedimentation will not generate injury to traffic and personal safety and safety of property.
The invention is monitored in real time in short term using the method for cantilever beam or long-term road settlement monitoring.Finally both it can reach
Monitoring to road safety also can reach the monitoring to quality of road construction.FBG monitoring subgrade deformation is by optical fiber light
Grid are encapsulated to monitoring pipe carrier, are then monitored in the direct embedding and subgrade soils of pipe carrier, under load action, the soil body and monitoring
Pipe common eigenvector, the displacement deformation for monitoring pipe can be measured by fiber-optic grating sensor mounted thereto, by managing to monitoring
Deformation analysis and calculating, can derive deformation size of the subgrade soils under load action.Fiber grating detection accuracy can be with
Reach Nano grade, precision is much larger than Traditional foundations deformation measurement method.
Beneficial effects of the present invention: it is different from traditional road settlement measurement, not will receive low temperature, soil property, acid-base property, electricity
Magnetic, the environment such as humidity influence；Both the accuracy that ensure that measurement also reduces required power, cost when measurement.It is existing most
Good technology because be just in the method for sandy soil, and sandy soil permeability it is strong, be closely knit without cohesive strength, its physical index
Degree, the above feature and cohesive soil are completely on the contrary, and the physical index of cohesive soil is consistency.Therefore such technology is actually being answered
The monitoring of Clayey Embankment is not applied in.The present invention may be implemented by fiber grating detection technique to subgrade deformation
Long term monitoring even after high road pavement construction, can also monitor deformation of the roadbed under dynamic loading, and is tested every time
Only need to can be completed for several minutes.In addition to this, Traditional foundations detection method is only able to achieve base intensity under load action of satisfying the need
Detection cannot detect temperature and water to the size of intensity effect, and be that receipts load, temperature and water etc. are more in roadbed actual use
Field coupling.The method that class dirt road dike carries out more tests is glued using fiber grating pair Han Qu, traditional detection can be overcome
The drawbacks of method cannot detect during highway is open to traffic, using fiber grating sensing technology to viscous class dirt road dike load,
Temperature and the lower strength and stability of water multi- scenarios method effect are detected, and this method is with good applicability, can be with
The parameters such as deformation, stress to viscous class dirt road dike carry out dynamic detection, and the test method is easy, cheap, precision is high.
The present invention is that optical instrument is attached on polyvinyl chloride detection bar, and surface has carried out coarse processing, with base in road
Layer has good trackability；The configuration of the present invention is simple, purposes is clear, reliable performance, and installation is low in cost, service life
It is extremely long；The present invention can carry out early warning by long-range measurement data in the first time that differential settlement occurs for road and repair
It is multiple；Slight and rigidity Design of the invention is flexible, can be placed in the road, the medium different location of embankment according to different situations.
Detailed description of the invention
Here is that the present invention is further described in conjunction with the accompanying drawings and embodiments.
Fig. 1 is the structural schematic diagram of the embodiment of the present invention 1；
Fig. 2 is the detection bar section figure of the embodiment of the present invention 1；
Fig. 3 is the (FBG) demodulator application drawing of the embodiment of the present invention 1；
Fig. 4 is the fiber bragg grating schematic illustration of the embodiment of the present invention 1；
Fig. 5 is the encapsulation schematic diagram of the embodiment of the present invention 1；
Fig. 6 is the cross-sectional view of the structure of the embodiment of the present invention 2.
In figure, pavement of road 1., in roadbed each layer filler 2., road foundation 3., Subsidence detection bar polyvinyl chloride outer shell
4. the inscribed probe of Subsidence detection bar is 5., fiber bragg grating displacement sensor 1 6., fiber bragg grating displacement sensor
7. 8. polyvinyl chloride detects bar, 9., detection pipes fixing end intermediate plate is 10. for detection bar cantilevers beam type fixing end.
Specific embodiment
Embodiment 1
Fig. 1 is the structural schematic diagram of the present embodiment.The present embodiment be by pavement of road 1., in roadbed each layer filler 2., road
3., 4., 5. Subsidence detection bar is inscribed to pop one's head in Subsidence detection bar polyvinyl chloride outer shell roadbed, fiber bragg grating displacement sensor
1 6., and 7., 8. polyvinyl chloride detects bar to fiber bragg grating displacement sensor, detects bar cantilevers beam type fixing end 9., detection pipes
10. fixing end intermediate plate is constituted.When assembling, first 6. 7. fiber bragg grating 1 is pasted into fiber bragg grating 2 and is beforehand with
8. two sides, this device construction hereinafter detect bar for fiber bragg grating to the polyvinyl chloride detection bar of good groove, then benefit
It is 10. fixed with detection pipes fixing end intermediate plate, is then 4. poured Subsidence detection bar together with it with concrete, be made steady
Fixed fixing end.Finally it is placed on filling compaction after base course.And protect exposed sedimentation pipe from damage.
Fig. 2 is the detection bar section figure of the present embodiment.First it is ensured that Subsidence detection bar 4. can be with optical fiber Bragg light
Grid detection bar settles simultaneously, will not fall off phenomenon or dislocation.When fiber bragg grating detection bar generates vertical strain
When, according to cantilever beam principle, the actual displacement situation of detection bar can be calculated.Test is using the weight of different quality to roadbed
It is loaded, test data is acquired by grating Acquisition Instrument in loading procedure.It, can by acquisition, analysis and the processing to data
To realize more tests of the deformation of roadbed under local function, temperature and stress.
Fig. 3 is the acquisition light requirement fibre grating data acquisition of the specific test data of (FBG) demodulator application drawing of the embodiment of the present invention 1
Instrument and (FBG) demodulator.Fiber Bragg grating (FBG) demodulator is measurement low speed variation, designs, can permit as parameters such as stress, temperature and pressures
Perhaps on an optical fiber, connection is greater than 8 FBG sensors simultaneously.
Fig. 4 is the fiber bragg grating schematic illustration of the embodiment of the present invention 1.(FBG) demodulator to inside of optical fibre by emitting
Light wave is fed back in each section optical grating point, to obtain the change in displacement feelings in optical fiber Bu Lade grating detection bar each position
Condition.
Fig. 5 is the encapsulation schematic diagram of the embodiment of the present invention 1.Optical fiber sensing technology difficult point is that grating cannot be directly embedded to,
Such as ABS plastic, pvc pipe, carbon fiber carrier material are needed, fiber grating and its carrier material generally should not be by adverse circumstances
It influences.Therefore, it in order to guarantee that fiber grating is not damaged, needs on optical fiber Bragg grating encapsulation to certain carrier, the present invention uses
Tube-packaged mode.
It is above a representative instance of the invention, implementation of the invention is without being limited thereto.
Embodiment 2
Fig. 6 is that the structural schematic diagram of the embodiment of the present invention 2 holds up original device, and the length of Subsidence detection bar shortens, and is placed in and builds
It builds in object ground, it can in real time or whether the ground of the long-term monitoring building is stable.In addition to setting method, remaining construction and reality
It is identical to apply example 1.
It is above a representative instance of the invention, implementation of the invention is without being limited thereto.
Claims (5)
1. the fiber grating cantilevered detection bar of a kind of pair of season frozen soil embankment monitoring is by fiber bragg grating displacement sensor
It is attached on detection pipe carrier (polyvinyl chloride monitoring pipe is 4 meters, and selection optical fiber is mono- grating sensing point of every 50cm), is buried
The deformation size for setting the subgrade soils in the case where road deep layer monitors dynamic loading by changing to optic fiber grating wavelength includes: road
Road road surface (1.), each layer filler (2.) in roadbed, road foundation (3.), Subsidence detection bar polyvinyl chloride outer shell (4.), sedimentation
The inscribed probe (5.) of bar is detected, fiber bragg grating displacement sensor 1(is 6.), fiber bragg grating displacement sensor
(7.), polyvinyl chloride detection bar (8.) detects bar cantilevers beam type fixing end (9.), detection pipes fixing end intermediate plate (10.), feature
It is: to avoid beam type fiber bragg grating from detecting the fixing end subsidence problems of bar, sedimentation pipe and FBG is detected into bar
It is placed in concrete fixing end；Concrete fixing end is in contact with base course does not occur relative displacement；Work as pavement of road
On when having dead load or dynamic load, each filler is pressed down against in roadbed, is led to detect bar deforming, is passed through the end pc
Measurement obtains stress displacement result.
2. the fiber grating cantilevered of a kind of pair of season frozen soil embankment monitoring detects bar, feature according to claim 1
It is, fiber bragg grating detection bar is fixed by detection pipes fixing end intermediate plate (10.), can be changed.
3. the fiber grating cantilevered of a kind of pair of season frozen soil embankment monitoring detects bar, feature according to claim 1
Be, fiber bragg grating detection bar be not limited only to the measurement to cold area's clay embankment, for the area Fei Han, sandy soil etc. remaining
Type embankment is equally applicable.
4. the fiber grating cantilevered of a kind of pair of season frozen soil embankment monitoring detects bar, feature according to claim 1
It is, fiber bragg grating detection bar is not limited only to unidirectionally use, and situation in need is to can carry out opposite or opposite placement.
5. the fiber grating cantilevered of a kind of pair of season frozen soil embankment monitoring detects bar, feature according to claim 1
It is, can be substituted for the Subsidence detection bar of fiber bragg grating detection bar binding any other can be fixed with ordinary surveying
The instrument whether end settles.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910830349.0A CN110485403A (en) | 2019-09-04 | 2019-09-04 | The fiber grating cantilevered of a kind of pair of season frozen soil embankment monitoring detects bar |
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| CN201910830349.0A CN110485403A (en) | 2019-09-04 | 2019-09-04 | The fiber grating cantilevered of a kind of pair of season frozen soil embankment monitoring detects bar |
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Cited By (1)
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| CN111854682A (en) * | 2020-06-18 | 2020-10-30 | 中交第一公路勘察设计研究院有限公司 | Method and equipment for monitoring uneven settlement of roadbed based on optical fiber implanted threaded beam |
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| CN103321201A (en) * | 2013-05-23 | 2013-09-25 | 上海港湾工程质量检测有限公司 | Sealed liquid differential pressure layered settlement gauge and embedding and measuring method thereof |
| CN108168510A (en) * | 2017-12-18 | 2018-06-15 | 河海大学 | Subgrade settlement DEFORMATION MONITORING SYSTEM and its installation method based on fiber grating |
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| 张书荣: "季节冻土路基应变的FBG检测系统设计", 《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111854682A (en) * | 2020-06-18 | 2020-10-30 | 中交第一公路勘察设计研究院有限公司 | Method and equipment for monitoring uneven settlement of roadbed based on optical fiber implanted threaded beam |
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