CN108168510A - Subgrade settlement DEFORMATION MONITORING SYSTEM and its installation method based on fiber grating - Google Patents
Subgrade settlement DEFORMATION MONITORING SYSTEM and its installation method based on fiber grating Download PDFInfo
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- CN108168510A CN108168510A CN201711362603.6A CN201711362603A CN108168510A CN 108168510 A CN108168510 A CN 108168510A CN 201711362603 A CN201711362603 A CN 201711362603A CN 108168510 A CN108168510 A CN 108168510A
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- fiber grating
- fiber
- settlement
- grating
- settlement gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Soil Sciences (AREA)
- Remote Sensing (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Radar, Positioning & Navigation (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)
- Testing Or Calibration Of Command Recording Devices (AREA)
Abstract
The invention discloses a kind of subgrade settlement DEFORMATION MONITORING SYSTEMs based on fiber grating, the supply unit and receiving device being connect including fiber Bragg grating (FBG) demodulator, with (FBG) demodulator, further include the fiber grating settlement gauge being connect with (FBG) demodulator, the support device being connect with settlement gauge top and the sedimentation device being connect with settlement gauge bottom；Sedimentation device is fixed on by support device on matting layer, and wavelength signals after (FBG) demodulator causes the deformation of settlement gauge inner fiber grating wavelength to be analyzed the sinking of sedimentation device, are transferred to receiving device by settlement gauge downward sedimentation and deformation synchronous with sedimentation device.It, will be fixed at the top of support device and settlement gauge when system is installed；Sedimentation pedestal is fixed with settlement gauge bottom, and the sinking of pedestal drives settlement gauge bottom to stretch, so as to fulfill the monitoring of fiber grating pair deformation.Compared with prior art, the present invention cooperative transformation and accurately monitors change in displacement together with the soft base soil body, has many advantages, such as electromagnetism interference, high sensitivity.
Description
Technical field
The present invention relates to highway subgrade sinking deformation monitoring system more particularly to the subgrade settlement based on fiber grating deforms
Monitoring system and its installation method.
Background technology
In recent years, as expressway construction rapidly develops, to the comfort of highway, safety and life requirement
It increasingly improves, therefore to proposing more strict requirements in terms of the treatment of soft foundation of its underpart, and settlement monitoring is at evaluation soft base
The whether reliable crucial ring of reason mode；Settlement of soft foundation monitoring is to slope instability, relative settlement, the end of the bridge of prevention high filling subgrade
It is most important to jump the problem of common in the expressway constructions such as vehicle and operation.
Traditional sedimentation monitoring system is mostly carried out by the way of embedded sedimentation plate, there are heavy workload, personnel is needed to match
It closes, easily by the shortcomings such as inside even from weather and monitoring accuracy be low, it is impossible to which the deformation of Overall Acquisition Subgrade Settlement of Expressways is special
Sign.And fiber grating has the characteristics that corrosion resistance and high-precision, has been widely used in building as a kind of novel material
Each engineering fields such as engineering, water conservancy traffic, Geological Engineering and space flight；However fiber grating is relatively suitble to the displacement inspection of small strain
Survey, and settlement of highway is large deformation, and fiber grating material in express highway roadbed filling craft easily by construction machine
The destruction of tool, therefore how to be reasonably applied to Fiber Bragg Grating technology in Soft Roadbed Settlement of Highway monitoring, it can be with
Soft base soil body cooperative transformation and accurately monitoring change in displacement becomes the technical barrier of urgent need to resolve together.
Invention content
Goal of the invention：The object of the present invention is to provide a kind of subgrade settlement DEFORMATION MONITORING SYSTEM based on fiber grating and its
Installation method makes Fiber Bragg Grating technology cooperative transformation and accurately monitor change in displacement together with the soft base soil body.
Technical solution：Monitoring system, the supply unit being connected including fiber Bragg grating (FBG) demodulator, with fiber Bragg grating (FBG) demodulator
And receiving device, it further includes solid at the top of the fiber grating settlement gauge being connect with fiber Bragg grating (FBG) demodulator and fiber grating settlement gauge
Surely the support device connected and the sedimentation device being fixedly connected with fiber grating settlement gauge bottom；Sedimentation device passes through support
Device is fixed on the matting layer of ground, fiber grating settlement gauge downward sedimentation and deformation synchronous with sedimentation device, fiber grating demodulation
After instrument causes the deformation of settlement gauge inner fiber grating wavelength to be analyzed the sinking of sedimentation device, wavelength signals are transferred to and are connect
Receiving unit.
Fiber grating settlement gauge further includes motionless section of top, bottom stretch section and fiber grating lead；Motionless section of top with
Support device is connected by stationary fixture and fixed, and bottom stretch section lower end is fixedly connected with sedimentation device, fiber grating lead and
Temperature compensation sensor connects.
Bottom stretch section includes the bottom stretch rod and stretch rod protection pipe that are fixed on by disk on pedestal, and bottom stretches
Comprising metal wire in bar contains flexible filler around wire, and wire is stretched with the sinking of sedimentation device, and then drives
The deformation of the motionless section of inner fiber grating in top.
Support device includes reinforcing bar and reduces support baseboard of the reinforcing bar in flexible subserate portion deflection, and reinforcing bar is fixed vertically
On support baseboard.
Sedimentation device includes pedestal, takes over and pipe collar, pedestal are fixed on by reinforcing bar on matting layer, several are taken over successively
Across after reinforcing bar, connected between taking over and taking over using pipe collar.
Stationary fixture includes two fasteners, and fastener will connect fixation at the top of reinforcing bar with fiber grating settlement gauge top.
Using the installation method of the subgrade settlement DEFORMATION MONITORING SYSTEM based on Fiber Bragg Grating technology, include the following steps：
(1) it is punched respectively in express highway roadbed left, center, right position, punching depth, will to reach at the basement rock of roadbed bottom
Reinforcing bar (11) is inserted into hole bottom and whitewashing anchoring is carried out around as fixed point；
(2) original place after leveling is excavated downwards, the hole bottom after excavation is flattened, spreading fine sand is as matting layer
(5), sedimentation plate pedestal (21) is placed in across reinforcing bar (11) on hole bottom matting layer (5)；
(3) it is settlement gauge (3) bottom stretch rod disk (31) is fixed with sedimentation pedestal (21), settlement gauge (3) top and steel
Muscle (11) is connected by stationary fixture (4)；
(4) sedimentation is taken over after (22) put on from reinforcing bar (11) top, joins end to end between taking over and connect, screw, until connecing
Stop when pipe is higher than original ground setpoint distance, from taking over, (22) are interior to draw fiber grating lead (38)；
(5) by the fiber-optic wire coil array of extraction on (22) are taken over, optical fiber jumper terminal is carried out to block covering；
(6) backfill is carried out up to original ground in sedimentation device (2) surrounding, and be compacted；
(7) by fiber-optic wire connection fiber Bragg grating (FBG) demodulator (6), (FBG) demodulator (6) is connected into power supply and computer, record sensing
The wavelength data of optical fiber records and captures peak value.
Operation principle：The present invention will transmit the optical fiber bragg grating FBG (Fiber being combined into one with sensing medium
Bragg Grating) technology be applied to Subgrade Settlement of Expressways deformation monitoring in.Specially by the FBG with certain pitch
It is laid on optical fiber, the measurement of stress and temperature is carried out using wavelength-division multiplex technique, when measured strain, temperature etc. change
When, the pitch of grating itself will change, and cause the variation of reflection wavelength, pass through calculating by the wavelength shift of reflection wavelength
It can obtain the sedimentation deformation amount of roadbed, settlement gauge carries temperature self-compensation function, can eliminate temperature change to wavelength shift
Influence.
In monitoring system, the support device of soft base fixed point is fixed on fixed at the top of fiber grating settlement gauge, to ensure
Displacement is not generated at the top of fiber grating settlement gauge；Sedimentation pedestal is fixed with fiber grating settlement gauge bottom, and the sinking of pedestal drives
Settlement gauge bottom stretches, so as to fulfill the monitoring of fiber grating pair deformation；It can also be realized furthermore with sedimentation device and roadbed is become
The traditional monitoring of shape, while the result that subgrade deformation can be monitored to Fiber Bragg Grating technology is verified.This system is by fiber grating
Settlement gauge is combined with traditional sedimentation device, realizes the double monitoring mode that fiber-optic monitoring develops simultaneously with traditional monitoring so that prison
Survey mode has diversity and selectivity.
Advantageous effect：Compared with prior art, the present invention cooperative transformation and accurately monitors displacement together with the soft base soil body
Variation, has many advantages, such as electromagnetism interference, high sensitivity.
Description of the drawings
Fig. 1 is monitoring system schematic；
Fig. 2 installs front view for fiber grating settlement gauge；
Fig. 3 is the vertical view of Fig. 2；
Fig. 4 is fiber grating settlement gauge in-site installation front view；
Fig. 5 lays vertical view for fiber grating settlement gauge；
Fig. 6 is the sectional view of Fig. 5.
Specific embodiment
As shown in Figure 1, monitoring system include support device 1, sedimentation device 2, fiber grating settlement gauge 3 and stationary fixture 4,
Matting layer 5, fiber Bragg grating (FBG) demodulator 6, computer 7, accumulator 8 and electric pressure converter 9；Correspondence is installed in its Computer 7
Handle software；The wavelength that fiber Bragg grating (FBG) demodulator 6 is used to transmit fiber-optic grating sensor 39 is analyzed, and analysis is obtained
Wavelength signals be transferred to computer 7；8 voltage of accumulator is 12V, and electric pressure converter 9 converts voltage as 12V-220V；Optical fiber
Grating demodulation instrument 6 is connected respectively with the lead of grating fibers settlement gauge 38, computer 7 and electric pressure converter 9.
As shown in Figure 2 and Figure 3, support device 1 includes round long straight reinforcing bar 11 and rectangular iron support baseboard 12, wherein steel
Muscle 11 is welded on vertically on support baseboard 12.
Sedimentation device 2, pedestal 21, take over 22 and pipe collar 23 including carrying centre bore, the wherein length in support device 1 are straight
Reinforcing bar 11 is from the centre bore of pedestal 21 down through take over 22 is taken over for the top and the bottom cylinder containing mantle fiber, the first piece-root grafting
Pipe is connected with pedestal 21, there is mantle fiber on the inside of pipe collar 23, it is adjacent take between be attached using pipe collar.
Fiber grating settlement gauge 3, including motionless section 37 of top, bottom stretch section, top respectively contains one for motionless section about 37
A fiber grating lead pillar 36, bottom stretch section include bottom stretch rod 32 and stretch rod protection pipe 35, stretch rod protection pipe
Flexible filler is contained around wire 33 in comprising metal wire 33 in 35, and wire 33 is stretched with the sinking of sedimentation device, gold
The stretcher strain for belonging to silk 33 drives the deformation of the motionless section of 37 inner fiber gratings in top, and 32 bottom of stretch rod is fixed with disk 31, with
It mutually welds 21 bottom of sedimentation pedestal.Fiber grating lead 38, as the transmission channel of wave, wherein a radicle is connected with temperature benefit
Sensor 39 is repaid, to compensate due to wavelength change caused by temperature change.
Stationary fixture 4, including two stainless steel supports 41, a stainless steel support 41 is connect with long straight reinforcing bar 11,
Another connect with fiber grating settlement gauge 3, is fastened two stainless steel supports 41 by bolt 42, plays the fixed length of connection
37 effect at the top of straight reinforcing bar 11 and fiber grating settlement gauge.
As shown in figure 4, the installation method of monitoring system includes the following steps：
(1) respectively in the monitoring position punching of express highway roadbed left, center, right, punching depth reaches at the basement rock of soft base bottom
Afterwards, the straight reinforcing bar 11 of length for bottom being welded with to support baseboard 12 is inserted into hole bottom, and carries out whitewashing anchoring as not around
Dynamic point；Wherein support baseboard 12 can prevent reinforcing bar 11 to be pierced into the soil body, and whitewashing anchoring ensure that the stabilization of support construction and monitoring dress
The reliability put.
(2) after original ground 10 flattens, 1m is excavated downwards using digging machine cooperation is artificial, the hole bottom after excavation is carried out whole
Flat, the fine sand that spreading thickness range is 4~6cm after sedimentation plate pedestal 21 is passed through long straight reinforcing bar 11, is placed in as matting layer 5
It cheats on bottom matting layer 5.
(3) by settlement gauge bottom stretch rod 32 and sedimentation 21 phase of plate pedestal welding so that stretch rod and sedimentation plate pedestal are same
Step is subjected to displacement downwards, increases monitoring system coordination and sensitivity；37 pass through admittedly with long straight reinforcing bar 11 at the top of settlement gauge
Clamp tool 4 is connected.
(4) multiple take overs 22 are constantly joined end to end from the straight reinforcing bar 11 of length and 3 top of settlement gauge set and connects, screws, taken over
Stop during to higher than original ground 50cm, fiber grating lead 38 is drawn out of take over 22；Settlement gauge is positioned in sedimentation pipe, is avoided
Destruction of the construction equipment to fiber grating settlement gauge during filling.
(5) by the fiber-optic wire coil array of extraction on take over 22, top is carried out blocking covering with isolation pocket, to reduce rain
The influence of water and travel fatigue.
(6) it is backfilled in 2 surrounding of sedimentation device, is backfilled to original ground 10, is compacted with compacting equipment.
(7) enclosing is carried out, and plug warning sign with iron bar in 22 outside of take over, prevents the shadow of filling craft construction machinery
It rings.
(8) a grating fibers wherein lead 38 is connected with fiber Bragg grating (FBG) demodulator 6, by fiber Bragg grating (FBG) demodulator 6
Computer 7, accumulator 8 and electric pressure converter 9 are connected, records the wavelength data and peak value of sensor fibre；
(9) increasing with Roadbed Soil, constantly takes over, and measurement ruler is placed in and takes over top, by optical level or
Electronic level carries out reading, and fiber grating settlement gauge and traditional settlement compaction are monitored altogether.
As shown in Figure 5, Figure 6, three fiber grating settlement gauges are sequentially arranged in left shoulder, road center line, at right wing shoulder, three
Point is located on same vertical line, and the settlement gauge support construction depth of burying is reaches at the basement rock of bottom.
Claims (7)
1. a kind of subgrade settlement DEFORMATION MONITORING SYSTEM based on fiber grating, including fiber Bragg grating (FBG) demodulator (6) and (FBG) demodulator
(6) supply unit and receiving device being connected, it is characterised in that：It further includes and passes through optical fiber light with fiber Bragg grating (FBG) demodulator (6)
The fiber grating settlement gauge (3) of grid lead (38) connection, the support device with being fixedly connected at the top of fiber grating settlement gauge (3)
(1) and with fiber grating settlement gauge (3) bottom the sedimentation device (2) being fixedly connected；The sedimentation device (2) passes through support
Device (1) is fixed on ground matting layer (5), and the fiber grating settlement gauge (3) sedimentation downwards synchronous with sedimentation device (2) becomes
Shape, the fiber Bragg grating (FBG) demodulator (6) cause the sinking of sedimentation device (2) in fiber grating settlement gauge (3) inner fiber grating wave
After long deformation is analyzed, wavelength signals are transferred to receiving device.
2. the subgrade settlement DEFORMATION MONITORING SYSTEM according to claim 1 based on fiber grating, it is characterised in that：The light
Fine grating settlement gauge (3) includes top motionless section (37), bottom stretch section and two fiber grating leads (38)；The top is not
Dynamic section (37) connect fixation, the bottom stretch section lower end and sedimentation device (2) with support device (1) by stationary fixture (4)
It is fixedly connected, the fiber grating lead (38) connect with temperature compensation sensor (39).
3. the subgrade settlement DEFORMATION MONITORING SYSTEM according to claim 2 based on fiber grating, it is characterised in that：The bottom
Portion's stretch section includes the bottom stretch rod (32) and stretch rod protection pipe (35) that are fixed on by disk (31) on pedestal (21), institute
Bottom stretch rod (32) interior comprising metal wire (33) is stated, contains flexible filler (34), wire around the wire (33)
(33) it is stretched with the sinking of sedimentation device (2), and then drives the deformation of motionless section of (37) the inner fiber grating in top.
4. the subgrade settlement DEFORMATION MONITORING SYSTEM according to claim 1 based on fiber grating, it is characterised in that：The branch
Support arrangement (1) includes reinforcing bar (11) and support baseboard (12), and the reinforcing bar (11) is fixed on vertically on support baseboard (12).
5. the subgrade settlement DEFORMATION MONITORING SYSTEM according to claim 1 based on fiber grating, it is characterised in that：It is described heavy
Falling unit (2) including pedestal (21), take over (22) and pipe collar (23), the pedestal (21) is fixed on matting layer by reinforcing bar (11)
(5) on, described several are taken over after (22) sequentially pass through reinforcing bar (11), are connected between taking over and taking over using pipe collar (23).
6. the subgrade settlement DEFORMATION MONITORING SYSTEM according to claim 1 based on fiber grating, it is characterised in that：It is described solid
Clamp tool (4) includes two fasteners (41), and the fastener (41) will push up at the top of reinforcing bar (11) with fiber grating settlement gauge (3)
Portion's connection is fixed.
7. a kind of installation method using the subgrade settlement DEFORMATION MONITORING SYSTEM based on fiber grating, it is characterised in that：Including with
Lower step：
(71) it is punched respectively in express highway roadbed left, center, right position, punches at depth to roadbed bottom basement rock, bottom is consolidated
Surely the reinforcing bar (11) for having support baseboard (12) is inserted into hole bottom and whitewashing anchoring is carried out around as fixed point；
(72) original place after leveling is excavated downwards, and the hole bottom after excavation is flattened, spreading fine sand is as matting layer
(5), it after pedestal (21) being passed vertically through reinforcing bar (11), is placed on hole bottom matting layer (5)；
(73) it is fiber grating settlement gauge (3) bottom stretch rod disk (31) and pedestal (21) is fixed, settlement gauge (3) top and steel
Muscle (11) is connected by stationary fixture (4)；
(74) it is taken over several after (22) put on from reinforcing bar (11) top, joins end to end between taking over and connect, screw, until take over height
Stop when original ground setpoint distance, by two fiber grating leads (38), from taking over, (22) are interior to draw；
(75) by the fiber-optic wire coil array of extraction on (22) are taken over, optical fiber jumper terminal is carried out to block covering；
(76) backfill is carried out up to original ground in sedimentation device (2) surrounding, and be compacted；
(77) fiber-optic wire is connected to fiber Bragg grating (FBG) demodulator (6), (FBG) demodulator (6) is connected into power supply and computer, record sensing
The wavelength data of optical fiber records and captures peak value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711362603.6A CN108168510B (en) | 2017-12-18 | 2017-12-18 | Roadbed settlement deformation monitoring system based on fiber bragg grating and installation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711362603.6A CN108168510B (en) | 2017-12-18 | 2017-12-18 | Roadbed settlement deformation monitoring system based on fiber bragg grating and installation method thereof |
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| Publication Number | Publication Date |
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| CN108168510A true CN108168510A (en) | 2018-06-15 |
| CN108168510B CN108168510B (en) | 2020-09-18 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109520471A (en) * | 2018-12-12 | 2019-03-26 | 石家庄铁道大学 | Optical fiber single hole deep soil settlement survey device and its monitoring method |
| CN110485403A (en) * | 2019-09-04 | 2019-11-22 | 哈尔滨理工大学 | The fiber grating cantilevered of a kind of pair of season frozen soil embankment monitoring detects bar |
| CN112378774A (en) * | 2020-10-22 | 2021-02-19 | 同济大学 | Soft soil foundation multidirectional large strain model test system based on fiber bragg grating measurement |
| CN113137948A (en) * | 2021-04-09 | 2021-07-20 | 山东省路桥集团有限公司 | Indoor model box test system for monitoring differential settlement of road and bridge transition section and evaluation method |
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| CN109520471A (en) * | 2018-12-12 | 2019-03-26 | 石家庄铁道大学 | Optical fiber single hole deep soil settlement survey device and its monitoring method |
| CN109520471B (en) * | 2018-12-12 | 2023-09-19 | 石家庄铁道大学 | Optical fiber single-hole layered settlement monitoring device and monitoring method thereof |
| CN110485403A (en) * | 2019-09-04 | 2019-11-22 | 哈尔滨理工大学 | The fiber grating cantilevered of a kind of pair of season frozen soil embankment monitoring detects bar |
| CN112378774A (en) * | 2020-10-22 | 2021-02-19 | 同济大学 | Soft soil foundation multidirectional large strain model test system based on fiber bragg grating measurement |
| CN113137948A (en) * | 2021-04-09 | 2021-07-20 | 山东省路桥集团有限公司 | Indoor model box test system for monitoring differential settlement of road and bridge transition section and evaluation method |
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| Publication number | Publication date |
|---|---|
| CN108168510B (en) | 2020-09-18 |
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