CN107314748A - A kind of long range roadbed continuous modification monitoring device and monitoring method - Google Patents
A kind of long range roadbed continuous modification monitoring device and monitoring method Download PDFInfo
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- CN107314748A CN107314748A CN201710381810.XA CN201710381810A CN107314748A CN 107314748 A CN107314748 A CN 107314748A CN 201710381810 A CN201710381810 A CN 201710381810A CN 107314748 A CN107314748 A CN 107314748A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 33
- 230000004048 modification Effects 0.000 title claims abstract description 24
- 238000012986 modification Methods 0.000 title claims abstract description 24
- 238000012806 monitoring device Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000000835 fiber Substances 0.000 claims abstract description 38
- 238000009826 distribution Methods 0.000 claims abstract description 10
- 230000000694 effects Effects 0.000 claims abstract description 6
- 230000008054 signal transmission Effects 0.000 claims abstract description 6
- 238000004873 anchoring Methods 0.000 claims abstract description 5
- 238000006073 displacement reaction Methods 0.000 claims description 24
- 238000004458 analytical method Methods 0.000 claims description 10
- 238000011065 in-situ storage Methods 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 4
- 239000000463 material Substances 0.000 description 6
- 239000013307 optical fiber Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 3
- 230000000452 restraining effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 210000001367 artery Anatomy 0.000 description 1
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- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
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Classifications
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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
Abstract
A kind of long range roadbed continuous modification monitoring device and monitoring method, with can effectively in real time, automatic monitoring long range roadbed continuous modification, and more economical rationality.It includes distributed sensing fiber, fixed reference bearing and the confining part being arranged in long range roadbed to be monitored, fixed reference bearing is arranged at intervals along roadbed bearing of trend, its anchoring lower ends is in roadbed lower stable stratum, confining part is arranged at intervals between adjacent two fixed references bearing along long range roadbed bearing of trend to be monitored, distributed sensing fiber extends and is fixedly connected on each fixed reference bearing along long range roadbed bearing of trend to be monitored, and the effect of constrained component keeps tight state;The distributed sensing fiber is connected by signal transmission fiber with distribution type fiber-optic (FBG) demodulator, computer and deformation computing module.
Description
Technical field
The invention belongs to civil engineering monitoring technical field, it is related to a kind of long range roadbed continuous modification monitoring device and prison
Survey method.
Background technology
With economic and science and technology fast development, highway in China and railway construction cause achieve attract people's attention into
Achievement, while China's the Belt and Road implementation and Asia basis set the establishment of the investment bank, it is the advanced high ferro technology of China
Push the world to and be filled with powerful vigor.Ended for the end of the year 2015, highway in China total kilometrage is more than 4,500,000 kilometers, the length of railroad lines in service
More than 120,000 kilometers, rank first in the world respectively and second, the economic development to China serves important tie and artery work
With.In addition, China carries out railway construction on the ground such as Russia and Africa, high ferro technology export has become China to surgery
The business card that skill shows.The work of highway, railway operation state and roadbed is closely related, and subgrade settlement can cause train operation
It is uneven pliable, excessive settling amount can cause train derail etc. catastrophic failure generation.Subgrade engineering under arms during,
By the long-term coupling such as complicated natural conditions, long-term vehicular load and human factor, roadbed can occur deterioration or even destroy,
Wherein post-construction settlement of subgrade is excessive or Karst Subgrade Subsidence is particularly important.To determine under various load actions, the space shape of roadbed
State and temporal characteristics, carry out subgrade deformation monitoring and lifting train safe operation tool are of great significance.With reference to deformation prison
Survey, on the one hand can grasp the stability of roadbed, be that safe operation diagnosis is submitted necessary information, to pinpoint the problems and adopt in time
Take measure;On the other hand it can deeply understand the mechanism of deformation, improve the theory of engineering design, carry out Feedback Design and set up to have
The subgrade deformation forecasting model of effect.
The deformation monitoring mode generally used includes personal monitoring and automatic two kinds of monitoring.Wherein personal monitoring's technology is main
There are heavy board-descending method, levelling process, these methods generally have construction interference is big, it is costly to monitor, consumption human cost is more etc.
Shortcoming;Automatic monitoring can realize round-the-clock, real-time, automatic monitoring, main to include point survey formula and distribution, and point survey formula is general
For key object, it is impossible to realize long range continuous monitoring, the problems such as easily failing to report, therefore distributed optical fiber sensing skill
Art just gradually causes extensive concern.The optical fiber that distribution type fiber-optic is used can be realized both as sensor, and as transport vehicle
Over long distances, a wide range of monitoring, and strain information at optical fiber arbitrfary point, great engineering application value can be measured exactly.But
The direct physical quantity of distributed optical fiber sensing is the axial strain of sensor fibre each position, it is impossible to directly perceived to provide road structure sedimentation
Displacement, it is therefore desirable to realize that continuous modification is monitored with reference to specific monitoring method and mounting means.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of long range roadbed continuous modification monitoring device, that can have
Effect is real-time, automatic monitoring long range roadbed continuous modification, and more economical rationality.
The present invention solves the technical scheme that is used of above-mentioned technical problem:
A kind of long range roadbed continuous modification monitoring device of the present invention, it is characterized in that:It includes being arranged at length to be monitored
Distributed sensing fiber, fixed reference bearing and confining part in roadbed, fixed reference bearing is along roadbed bearing of trend
It is arranged at intervals, its anchoring lower ends is in roadbed lower stable stratum, and confining part is along between long range roadbed bearing of trend to be monitored
Between adjacent two fixed references bearing is arranged at, distributed sensing fiber extend along long range roadbed bearing of trend to be monitored and
It is fixedly connected on each fixed reference bearing, and the effect of constrained component keeps tight state;The distributed sensing fiber passes through
Signal transmission fiber is connected with distribution type fiber-optic (FBG) demodulator, computer and deformation computing module.
Another technical problem to be solved by this invention is to provide a kind of with a kind of above-mentioned long range roadbed continuous modification prison
The monitoring method of device is surveyed, this method comprises the following steps:Obtained by finite element analysis suffered by distributed sensing fiber each point
Longitudinal strain and vertical displacement, choose two close on confining part, close on confining part between fixed reference bearing in the middle of
Point, the longitudinal strain of a quarter point position and vertical deviation set up strain-displacement relation, it is determined that the deformation of strain to displacement is assisted
Adjust coefficient;Carry out rating test in situ, and coordinate according to strain-displacement deformation that rating test in situ and finite element analysis are obtained
Coefficient, determines coefficient of variation;By toward, return direction and calculate to close at two between fixed reference bearing respectively successively and deform;Amendment becomes
Shape result of calculation, output skew information.
The beneficial effects of the invention are as follows sensor fibre combines corresponding mounting means in a distributed manner, can realize long range road
Base continuous modification is monitored, and the mounting means based on simple light confining part is combined with fixed reference bearing can be adjusted flexibly prison
Precision is surveyed, and cost is low, construction is fast, more economical rationality.
Brief description of the drawings
This specification includes drawings described below:
Fig. 1 is a kind of schematic diagram of long range roadbed continuous modification monitoring device of the invention;
Fig. 2 is a kind of schematic cross-sectional view of long range roadbed continuous modification monitoring device of the invention;
Fig. 3 is a kind of schematic cross-sectional view of long range roadbed continuous modification monitoring device of the invention;
Fig. 4 is a kind of long range roadbed continuous modification monitoring device of the invention on the typical embankment of railway double-track non-fragment orbit
Monitoring schematic cross-sectional view;
Parts, toponym and corresponding mark are shown in figure:Surface layer of subgrade bed 1, bottom layer of subgrade 2, embankment noumenon 3,
Foundation 4, distribution type fiber-optic (FBG) demodulator 10, distributed sensing fiber 11, fixed reference bearing 20, confining part 30, signal
Transmission Fibers 40, computer and deformation computing module 50, long range roadbed 60 to be monitored.
Embodiment
The present invention is further described with reference to the accompanying drawings and examples.
Referring to Figures 1 and 2, Fig. 3, a kind of long range roadbed continuous modification monitoring device of the invention it include being arranged at and waiting to supervise
Distributed sensing fiber 11, fixed reference bearing 20 and the confining part 30 surveyed in long range roadbed 60, fixed reference bearing 20
It is arranged at intervals along roadbed bearing of trend, its anchoring lower ends is in roadbed lower stable stratum.Confining part 30 along length to be monitored away from
It is arranged at intervals at from the bearing of trend of roadbed 60 between adjacent two fixed references bearing 20, distributed sensing fiber 11 is along length to be monitored
Extend and be fixedly connected on each fixed reference bearing 20 apart from the bearing of trend of roadbed 60, and the effect of constrained component 30 keeps tight
State.The distributed sensing fiber 11 passes through signal transmission fiber 40 and distribution type fiber-optic (FBG) demodulator 10, computer and deformation
Computing module 50 is connected.
Distributed sensing fiber 11 functions as strain transducer, and detection is along optical fiber by fixed reference bearing 20 or light
Each section roadbed longitudinal strain amount that confining part 30 is split.Fixed reference bearing 20 provides for the monitoring of long range continuous modification
Basis of reference point, and handled and assessment key point as Monitoring Data, confining part structure 30 provides calibration to improve monitoring accuracy
Point, is used in combination by fixed reference bearing 20 and confining part 30 and provides the monitoring section for meeting design variations required precision
Layout scheme.Signal transmission fiber 40 is used for the optical signal for transmitting distributed sensing fiber 11, and distribution type fiber-optic (FBG) demodulator 10 will
Change in optical signal is demodulated into dependent variable, and computer and deformation computing module 50 are used for Monitoring Data and handle and show.
To improve monitoring accuracy and carrying out tunneling boring monitoring, the fixed reference bearing 20 to long range roadbed 60 to be monitored
It is horizontally arranged at interval at least two groups along long range roadbed 60 to be monitored, it is solid corresponding to each group in the long range roadbed 60 to be monitored
Determine at least two distributed sensing fibers 11 of longitudinally spaced setting of benchmark bearing 20.
Reference picture 2 and Fig. 3, fixed reference bearing 20 are the larger stainless-steel pipe of rigidity, and steel pipe bottom is embedded into motionless
Point (position such as basement rock), steel pipe top is fixed with distributed sensing fiber 11, it is ensured that in whole deformation monitoring process, fixed reference
Vertically and horizontally displacement is in 0 deformation state to bearing all the time.Confining part 30 is the larger stainless-steel pipe of rigidity, according to roadbed scene
Soil body material property, determines the fixed position of the bottom of confining part structure 30, and determine that light is constrained according to subgrade deformation monitoring accuracy
The longitudinally spaced position of component 30.Fixed reference bearing 20 and proximity constraint component 30, at neighbouring two between light confining part 30 point
Cloth sensor fibre 11 keeps the tight state under certain stress, and confining part 30 is realized by modes such as bonding, anchoring, supports
Fixed reference bearing 20 and proximity constraint component 30, distributed sensing fiber 11 and ground between light confining part 30 at two
The cooperative transformation of body or artificial works.
Fig. 4 is a kind of long range roadbed continuous modification monitoring device of the invention on the typical embankment of railway double-track non-fragment orbit
Monitoring schematic cross-sectional view, for realize give warning in advance, except the bottom surface of surface layer of subgrade bed 1 along line direction lay 3 distributions
Outside sensor fibre 11,3 distributed sensing fibers 11 are also laid successively in the bottom surface of embankment noumenon 3;Can be according to engineering demand in base
Distributed sensing fiber 11 is set up in the bed bottom surface of bottom 2 and foundation 4, monitoring and warning accuracy is improved.
Long range roadbed continuous modification monitoring method of the present invention, comprises the following steps:
1) longitudinal strain and vertical displacement suffered by each point of distributed sensing fiber 11 are obtained by finite element analysis, chosen
Two are closed on confining part 30, close on intermediate point between confining part 30 and fixed reference bearing 20, a quarter point position
Longitudinal strain and vertical deviation set up strain-displacement relation, it is determined that compatibility of deformation coefficient of the strain to displacement;
2) rating test in situ, and the strain-displacement deformation obtained according to rating test in situ and finite element analysis are carried out
Cooperation index, determines coefficient of variation;
3) by toward, return direction and calculate to close at two between fixed reference bearing 20 respectively successively and deform;
4) amendment deformation result of calculation, output skew information.
Specific method is, in fixed reference bearing 20, to close on confining part 30 and the position of distributed sensing fiber 11 is determined
In the case of, according to the modulus of elasticity of the material of distributed sensing fiber 11, ground material and loading characteristic, pass through finite element fraction
AnalysisObtain the longitudinal strain (ε suffered by each point of distributed sensing fiber 11i, i=
1 ..., n) with vertical displacement (ρi, i=1 ..., n), n is that the strain on distributed sensor optical fiber 11 is counted out, and chooses two
It is individual to close on light confining part 30, close on intermediate point between restraining structure 30 and fixed reference bearing 20, a quarter point position
Longitudinal strain and vertical deviation set up strain-displacement relation (ρi=f (εi)=aj+bj×εi+cj×εi 2) determine that displacement is arrived in strain
Compatibility of deformation coefficient Aj=(aj,bj,cj), j represents certain operating mode.In view of the discreteness of roadbed ground, based on finite element
Compatibility of deformation coefficient Λ={ A of the strain that analysis is set up under m kind ground materials to displacement1..., Aj..., Am}。
Discreteness in view of on-site actual situations material character and the otherness with finite element analysis, carry out mark in situ
Fixed experiment, specially demodulates the strain value of each point of distributed sensing fiber 11 using distribution type fiber-optic (FBG) demodulator 10, utilizes simultaneously
Live total powerstation observe two close on light confining part 30, close on intermediate point between restraining structure 30 and fixed reference bearing 20,
The vertical displacement of a quarter point position, based on Monitoring Data, sets up strain-displacement relation ρ1i=f (ε1i)=a1j+b1j×ε1i
+c1j×ε1i 2, it is determined that compatibility of deformation coefficient B of the strain to displacementj=(a1j,b1j,c1j).According to in-situ test operating mode, set up many
Group rating test in situ, obtains corresponding strain and displacement deformation cooperation index collection Δ={ B1..., Bj..., Bm, according to former
Strain-displacement deformation cooperation index that position rating test and finite element analysis are obtained, determines coefficient of variation Γ=Λ/Δ, difference
Coefficient is mainly used for obtaining strain-displacement deformation cooperation index under a variety of ground materials.
Finally by it is past, return direction respectively successively calculate close on restraining structure 30 and fixed reference bearing 20, close at two consolidate
Determine deformation between benchmark bearing 20, further amendment deformation result of calculation, improve strain to the conversion accuracy of deformation, and export most
Whole deformation monitor information.
Some principles of the present invention described above that simply explains through diagrams, are not intended to the present invention being confined to shown and institute
In the concrete structure and the scope of application stated, therefore every corresponding modification for being possible to be utilized and equivalent, belong to this hair
Bright apllied the scope of the claims.
Claims (4)
1. a kind of long range roadbed continuous modification monitoring device, it is characterized in that:It includes being arranged at long range roadbed to be monitored
(60) distributed sensing fiber (11), fixed reference bearing (20) and confining part (30) in, fixed reference bearing (20) edge
Roadbed bearing of trend is arranged at intervals, its anchoring lower ends in roadbed lower stable stratum, confining part (30) along length to be monitored away from
It is arranged at intervals at from roadbed (60) bearing of trend between adjacent two fixed references bearing (20), distributed sensing fiber (11) edge is treated
Monitoring long range roadbed (60) bearing of trend extends and is fixedly connected on each fixed reference bearing (20), and constrained component (30)
Effect keeps tight state;The distributed sensing fiber (11) passes through signal transmission fiber (40) and distribution type fiber-optic (FBG) demodulator
(10), computer and deformation computing module (50) connection.
2. a kind of long range roadbed continuous modification monitoring device as claimed in claim 1, it is characterized in that:The fixed reference branch
Seat (20) is horizontally arranged at interval at least two groups along long range roadbed (60) to be monitored.
3. a kind of long range roadbed continuous modification monitoring device as claimed in claim 1, it is characterized in that:The length to be monitored away from
From corresponding in roadbed (60), each group fixed reference bearing (20) is longitudinally spaced to set at least two distributed sensing fibers (11).
4. using a kind of such as monitoring method of long range roadbed continuous modification monitoring device of claims 1 to 3 any one, including
Following steps:
1) longitudinal strain and vertical displacement suffered by distributed sensing fiber (11) each point are obtained by finite element analysis, chooses two
It is individual to close on confining part (30), close on intermediate point between confining part (30) and fixed reference bearing (20), a quarter point position
Strain-displacement relation is set up in the longitudinal strain and vertical deviation put, it is determined that compatibility of deformation coefficient of the strain to displacement;
2) carry out rating test in situ, and coordinate according to strain-displacement deformation that rating test in situ and finite element analysis are obtained
Coefficient, determines coefficient of variation;
3) by toward, return direction and calculate to close at two between fixed reference bearing (20) respectively successively and deform;
4) amendment deformation result of calculation, output skew information.
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108592855A (en) * | 2018-04-28 | 2018-09-28 | 中国民航大学 | A kind of airfield pavement lower part excavation deformation monitoring device based on BOTDA sensing technologies |
CN109029337A (en) * | 2018-07-25 | 2018-12-18 | 中国电建集团北京勘测设计研究院有限公司 | A kind of earth and rockfill dam impervious body DEFORMATION MONITORING SYSTEM and monitoring method |
CN110132137A (en) * | 2019-05-06 | 2019-08-16 | 哈尔滨工业大学 | A kind of large-scale suspension bridge steel box-girder overall length Displacements Distribution measurement method based on distributed optical fiber sensing |
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 |
CN112342877A (en) * | 2020-10-29 | 2021-02-09 | 钟吉昌 | Road flatness detection method |
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Publication number | Priority date | Publication date | Assignee | Title |
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CN108592855A (en) * | 2018-04-28 | 2018-09-28 | 中国民航大学 | A kind of airfield pavement lower part excavation deformation monitoring device based on BOTDA sensing technologies |
CN109029337A (en) * | 2018-07-25 | 2018-12-18 | 中国电建集团北京勘测设计研究院有限公司 | A kind of earth and rockfill dam impervious body DEFORMATION MONITORING SYSTEM and monitoring method |
CN110132137A (en) * | 2019-05-06 | 2019-08-16 | 哈尔滨工业大学 | A kind of large-scale suspension bridge steel box-girder overall length Displacements Distribution measurement method based on distributed optical fiber sensing |
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 |
CN112342877A (en) * | 2020-10-29 | 2021-02-09 | 钟吉昌 | Road flatness detection method |
CN112342877B (en) * | 2020-10-29 | 2021-12-21 | 宁夏公路工程质量检测中心(有限公司) | Road flatness detection method |
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