CN108252288A - A kind of deformation of deep excavation distributed monitoring system based on OFDR technologies - Google Patents
A kind of deformation of deep excavation distributed monitoring system based on OFDR technologies Download PDFInfo
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- CN108252288A CN108252288A CN201810029465.8A CN201810029465A CN108252288A CN 108252288 A CN108252288 A CN 108252288A CN 201810029465 A CN201810029465 A CN 201810029465A CN 108252288 A CN108252288 A CN 108252288A
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- fiber
- optical fiber
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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
- E02D1/02—Investigation of foundation soil in situ before construction work
- E02D1/022—Investigation of foundation soil in situ before construction work by investigating mechanical properties of the soil
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
-
- 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
Abstract
The invention discloses a kind of deformation of deep excavation distributed monitoring systems based on OFDR technologies, including the acquisition of distribution type fiber-optic inclinometer pipe, distribution type fiber-optic axle power meter, three fiber devices of distribution type fiber-optic water-level gauge and fiber data and Transmission system, fiber data processing and analysis system, monitoring result display system three subsystems.After the completion of each section fiber arrangement, adjacent fiber is sequentially connected, it is formed " deformation of deep excavation distributed monitoring network ", only OBR data collecting instruments need to be accessed in fibre-optic terminus when data acquire, primary acquisition can obtain strain and the temperature variation data of all monitoring objectives, the automatic business processing of data is carried out by OBR data processing systems again, obtains deformation, axle power and the location information of respective objects, and show in the display system with intuitionistic forms such as charts.This method is with precision is good, efficient, range is wide, simple operation and other advantages.
Description
Technical field
The invention belongs to geotechnical engineerings to monitor field, and in particular to a kind of deformation of deep excavation based on OFDR technologies is distributed
Monitoring system.
Background technology
With a large amount of constructions of skyscraper and underground foundation facility, foundation pit quantity constantly increases, and scale constantly expands, such as
What the effectively deformation of monitoring foundation pit in the construction process, ensureing the safety and stability of foundation pit becomes engineering circles focus of attention and research
Hot spot.Foundation pit soil horizontal displacement, level of ground water, axial force of the supports are three importances of pit retaining monitoring, at present to this
The monitoring of three projects is mainly using traditional manpower such as inclinometer, water-level gauge and reinforcing bar axle power meter and electronically, these means
There is following limitations and deficiency：(1) it is mostly point measurement, gathered data is limited, and missing inspection easily occurs, and can not reflect comprehensively
The deformation characteristics of monitoring object；(2) it is larger to manpower consumption, not only cause human cost excessively high, but also monitoring efficiency is low, artificially
Error is big；(3) can not accomplish to monitor in real time, and data processing relies primarily on the later stage and manually handles, information feedback is inadequate
In time, it is difficult to reach the requirement of intelligent monitoring and information-aided construction；(4) point layout is cumbersome, and measuring point survival rate is low, warp
Often influence monitoring progress；(5) accuracy of instrument is not high, it is difficult to reflect the slight change of monitoring object part.
OFDR (Optical Frequency Domain Reflectometer) technology is Distributed Optical Fiber Sensing Techniques
One kind, the OBR backlight reflectometers based on OFDR technologies are the state-of-the-art distributed fiberoptic sensors of current industry, there is micron
The high spatial resolution and high sensitivity of rank, single-ended detection can be applied to single mode and multimode fibre, measure every time all with NIST
Traceable standard calibrates wavelength, does not need to factory's routine calibration, can track polarization state variation of the light in transmission process.
OBR can really realize the monitoring of zero dead zone of high-precision, have more performance advantage than optical fiber technologies such as FBG, BOTDR, ROTDR now
And future in engineering applications.
Invention content
Goal of the invention：In order to overcome the deficiencies in the prior art, the present invention provides a kind of depth based on OFDR technologies
Foundation pit deformation distributed monitoring system.
Technical solution：The present invention uses following technical scheme：A kind of deformation of deep excavation distribution prison based on OFDR technologies
Examining system mainly includes three distribution type fiber-optic inclinometer pipe, distribution type fiber-optic axle power meter, distribution type fiber-optic water-level gauge optical fiber dresses
It puts, further includes fiber data acquisition and Transmission system, fiber data processing and three analysis system, monitoring result display system sons
System；
Distribution type fiber-optic inclinometer pipe includes soil body inclinometer pipe and pile body inclinometer pipe, and pile body inclinometer pipe, which is set to, abuts foundation pit four
The position in week, soil body inclinometer pipe are disposed in proximity to the position of foundation pit surrounding；
The score of distribution type fiber-optic axle power is strain fibre optical sensor and optical fiber temperature sensor, and strain fibre optical sensor is pre-
Internal reinforcing bar or support surface are fixed on after stress is exceptionally straight, optical fiber temperature sensor is then positioned in hollow hoses, placed
The hollow hoses of optical fiber temperature sensor and strain transducer are placed side by side；
Distribution type fiber-optic water-level gauge be by the U-shaped groove being layed among special tape of optical fiber, U-shaped optical fiber
End and tape end part aligning；
After optical fiber is by distributed water-level gauge and the series connection of distribution type fiber-optic inclinometer pipe, then it is in parallel with distribution type fiber-optic axle power meter
Fiber data acquisition and Transmission system are connected to, fiber data acquisition is handled again with fiber data with Transmission system and analysis system
And monitoring result display system is sequentially connected in series.
Further, the groove both sides of distribution type fiber-optic water-level gauge carry scale, and the left side is international unit, and the right is English system
Unit, the optical fiber in groove are sealed with waterproof temperature sensing material.
Further, distribution type fiber-optic inclinometer pipe uses aluminium alloy inclinometer pipe, and optical fiber is U-shaped to be layed in face inclinometer
In the groove of slideway, groove depth 1.5mm；
Further, optical fiber is sequentially connected after the completion of the fibre optical sensor arrangement of each section, optical fiber junction is swollen with heat
Tube expansion is reinforced, and rest part is protected with armouring sheath, and fibre-optic terminus need to only be accessed to during monitoring the acquisition of OBR data
Instrument, primary acquisition can obtain strain and the temperature data of all monitoring objectives.
Further, fiber data acquisition and transmitting device are OBR data collecting instruments, and data process＆analysis system is root
According to the software module that surveyed features of the object is programmed, monitoring result display system is intuitive with chart etc. according to handling result
Form shows monitoring result.
Further, there is foundation pit support between each adjacent side of foundation pit, optical fiber is equipped in foundation pit support, gone back with what optical fiber was set up in parallel
There is optical fiber temperature sensor.
Further, the optical fiber uses PE optical fiber, and the exposed PE optical fiber on ground is protected using armouring.
Further, the bottom that distribution type fiber-optic water-level gauge is inserted into is located above water level line/phreatic line.
Advantageous effect：OFDR fiber data acquisition techniques are applied in deformation of deep excavation monitoring by the present invention, and are devised
Corresponding data processing system will generate following advantageous effect：
1. distribution type fiber-optic technology is monitored applied to foundation pit deformation, compared to traditional monitoring means, distribution type fiber-optic prison
Measuring tool has the advantages such as measuring point survival rate is high, gathered data is comprehensive, can monitor in real time；
2. data acquisition is carried out to fiber-optic signal using OBR equipment, compared to other fiber data acquisition techniques, OFDR skills
Art possesses higher sensitivity and spatial resolution, realizes the zero dead zone monitoring of foundation pit deformation；
3. each section optical fiber is sequentially connected in series, foundation pit side shape distributed monitoring network is formed, fibre-optic terminus is inserted into OBR data and is adopted
Collect instrument, primary acquisition can just obtain all deformation of object to be measured and location information, and monitoring efficiency is high, and human error is small；
4. using OBR foundation pit deformation data processing systems, realize the automatic business processing of monitoring data, knot can be monitored
It the Dynamic Display of fruit and timely feedbacks；
5. with the development of relevant art, the research and development of OBR fiber data Acquisition Instruments and manufacturing expense also will be lower and lower, phase
The engineering monitoring cost answered can also reduce, therefore this technology can obtain popularizing in an all-round way and application.
The technical issues of being solved in addition to invention described above, form technical solution technical characteristic and by these skills
Caused by the technical characteristic of art scheme outside advantage, the deformation of deep excavation distributed monitoring system of the invention based on OFDR technologies
And the application method other technologies problem that can be solved, the other technical characteristics that include in technical solution and these technical characteristics
The advantages of bringing will be described in more detail with reference to attached drawing.
Description of the drawings
Fig. 1 is the whole diagrammatic cross-section of the embodiment of the present invention；
Fig. 2 is the whole schematic top plan view of the embodiment of the present invention；
Fig. 3 is the overall schematic of distribution type fiber-optic inclinometer pipe；
Fig. 4 is the schematic cross-section of distribution type fiber-optic inclinometer pipe；
Fig. 5 is distribution type fiber-optic water-level gauge schematic diagram；
Fig. 6 arranges schematic diagram for distribution type fiber-optic axle power meter.
Specific embodiment
Embodiment：
The whole diagrammatic cross-section of the present embodiment is as shown in Figure 1, in Fig. 1, and 1 is distribution type fiber-optic water-level gauge, and detail drawing is such as
Shown in Fig. 4, optical fiber is placed in small U-shaped in the groove among tape, and groove depth 1.5mm, tape both ends indicate scale, and the left side is
International unit (m), the right is English unit (inch), to meet different requirement of engineering.Optic fibre end is aligned with scale bottom end, light
On the one hand fine U-shaped laying can obtain the monitoring data of the right and left in one-shot measurement, the two, which is averaged, can reduce survey
Error is measured, the laying of another aspect U-shaped enables water-level gauge to be attached with neighbouring optical fiber, convenient for forming monitoring network.2
For PE optical fiber, when laying, directly encloses tape groove with binding agent, without Additional Protection.2 ' be the exposed optical fiber on ground, is needed
In addition armouring sheath is protected, prevent from being destroyed, increase rigidity and durability plus thermal expansion pipe at fused fiber splice.3 are
Soil body inclinometer pipe, optical fiber U-shaped laying on inclinometer pipe can arrange multiple U-shaped according to the specific length of inclinometer pipe, and 4 be pile body
Inclinometer pipe, pile body inclinometer pipe is similar with the arrangement of soil body inclinometer pipe, but different when mounted, and soil body inclinometer pipe assembles it
After be directly placed into the soil body and tamped with fine sand, pile body inclinometer pipe need to be bound on steel reinforcement cage, and in steel reinforcement cage decentralization process
It takes over, to pay special attention to the protection of optical fiber during taking over, especially to prevent scolding tin calcination pair in steel reinforcement cage connection procedure
The destruction of optical fiber.5 be bored concrete pile, and 6 be foundation pit, and 7 support for foundation pit, optical fiber support surface arrangement detail as shown in figure 5,2 "
For temperature sensor, it is the effect that it will be made not stress in the bigger hollow hoses of embedded fibers internal diameter, is then pasted onto side by side
Beside strain transducer, for the temperature-compensating of pair of strain sensors, 13 be the glue of encapsulation, it is desirable that waterproof temperature-sensitive.8 be optical fiber
Data acquire and Transmission system, are an OBR fiber data Acquisition Instrument, are connected to realize the timely and quick of data with computer
Transmission.9 are handled and analysis system for fiber data, can according to the characteristics of fiber data the institute of automatic decision monitoring object it is in place
It puts and extracts related data and carry out the processing such as smooth, denoising, 10 be monitoring result display system, can general's treated fiber count
The intuitive form such as chart is shown according to this.11 be the soil body, and 12 be phreatic line.
Different installation technics can be selected during fiber deployment according to different project situations, are mainly reflected in following side
Face：(1) can be by fiber arrangement in different location according to the difference of project progress, it early period can be by fiber deployment in reinforcing bar etc. in engineering
, can be by fiber deployment on structures surface in the engineering middle and later periods on internal component, the result of the two can accurately reflect structures
Ess-strain, meet requirement of engineering；(2) it may be selected different binding agents according to the tensity of duration, when duration anxiety adopts
With Instant cements such as AB glue, 502, the slow curings glue such as fiberglass glue, epoxy resin are used when the duration takes it easy；(3) putting according to optical fiber
Seated position selects suitable protected mode, can be carried out in the personnel more severe place of more construction environment of walking about with protective metal shell
It protects emphatically, optical fiber with disk line device can folded or protected with conventional hoses, a side by construction infection smaller position
Engineering cost is saved in face, on the other hand reduces technical difficulty, is improved and is laid efficiency.
After the completion of the fiber deployment of each section, should by the connectivity of intelligent acess OBR data collecting instrument measurement circuits,
And the test acquisition of data is carried out, to determine the validity of data.Each section optical fiber should test entire prison after being connected into an entirety
The connectivity of survey grid network, and relevant parameter is set, then carry out the initial acquisition of data.For convenience of the later stage data acquisition and
Monitoring in real time, can extended fiber length, fibre-optic terminus is arranged in work station or office, to prevent extraneous severe ring
Border brings inconvenience to data collection task.
Embodiments of the present invention are described in detail above in association with attached drawing, but the present invention is not limited to described reality
Apply mode.For those of ordinary skill in the art, in the range of the principle of the present invention and technological thought, to these implementations
Mode carries out a variety of variations, modification, replacement and deformation and still falls in protection scope of the present invention.
Claims (8)
1. a kind of deformation of deep excavation distributed monitoring system based on OFDR technologies, it is characterised in that：It is main to include distributed light
Three fine inclinometer pipe, distribution type fiber-optic axle power meter, distribution type fiber-optic water-level gauge fiber devices further include fiber data acquisition and pass
Defeated system, fiber data processing and analysis system, monitoring result display system three subsystems；
Distribution type fiber-optic inclinometer pipe includes soil body inclinometer pipe and pile body inclinometer pipe, and pile body inclinometer pipe, which is set to, abuts foundation pit surrounding
Position, soil body inclinometer pipe are disposed in proximity to the position of foundation pit surrounding；
The score of distribution type fiber-optic axle power is strain fibre optical sensor and optical fiber temperature sensor, and strain fibre optical sensor is in prestressed
Internal reinforcing bar or support surface are fixed on after exceptionally straight, optical fiber temperature sensor is then positioned in hollow hoses, placed temperature
The hollow hoses of fibre optical sensor and strain transducer are placed side by side；
Distribution type fiber-optic water-level gauge is the end of U-shaped optical fiber by the U-shaped groove being layed among special tape of optical fiber
With tape end part aligning；
After optical fiber is by distributed water-level gauge and the series connection of distribution type fiber-optic inclinometer pipe, then it is connected in parallel with distribution type fiber-optic axle power meter
To fiber data acquisition and Transmission system, fiber data acquisition with Transmission system again with fiber data processing with analysis system and
Monitoring result display system is sequentially connected in series.
2. the deformation of deep excavation distributed monitoring system according to claim 1 based on OFDR technologies, it is characterised in that：Point
The groove both sides of cloth optical fiber water-level gauge carry scale, and the left side is international unit, and the right is English unit, and the optical fiber in groove is used
Waterproof temperature sensing material is sealed.
3. the deformation of deep excavation distributed monitoring system according to claim 1 based on OFDR technologies, it is characterised in that：Point
Cloth optical fiber inclinometer pipe uses aluminium alloy inclinometer pipe, and optical fiber is U-shaped to be layed in the groove of face inclinometer slideway, and groove is deep
1.5mm。
4. the deformation of deep excavation distributed monitoring system according to claim 1 based on OFDR technologies, it is characterised in that：Respectively
Optical fiber is sequentially connected after the completion of partial fibre optical sensor arrangement, optical fiber junction is reinforced with thermal expansion pipe, remaining part
It point is protected with armouring sheath, fibre-optic terminus need to only be accessed OBR data collecting instruments by when monitoring, and primary acquisition can obtain institute
There are strain and the temperature data of monitoring objective.
5. the deformation of deep excavation distributed monitoring system according to claim 1 based on OFDR technologies, it is characterised in that：Light
The acquisition of fine data and transmitting device are OBR data collecting instruments, and data process＆analysis system is according to being surveyed features of the object progress
The software module of programming, monitoring result display system are to show monitoring result in the form of chart etc. is intuitive according to handling result.
6. the deformation of deep excavation distributed monitoring system according to claim 1 based on OFDR technologies, it is characterised in that：Base
Cheating between each adjacent side has foundation pit support, and optical fiber is equipped in foundation pit support, also has optical fiber temperature sensor with what optical fiber was set up in parallel.
7. the deformation of deep excavation distributed monitoring system based on OFDR technologies according to claim 1 to 6 any one,
It is characterized in that：The optical fiber uses PE optical fiber, and the exposed PE optical fiber on ground is protected using armouring.
8. the deformation of deep excavation distributed monitoring system based on OFDR technologies according to claim 1 to 6 any one,
It is characterized in that：The bottom that distribution type fiber-optic water-level gauge is inserted into is located above water level line/phreatic line.
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| CN201810029465.8A CN108252288A (en) | 2018-01-12 | 2018-01-12 | A kind of deformation of deep excavation distributed monitoring system based on OFDR technologies |
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| CN201810029465.8A CN108252288A (en) | 2018-01-12 | 2018-01-12 | A kind of deformation of deep excavation distributed monitoring system based on OFDR technologies |
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Cited By (8)
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| CN108917635A (en) * | 2018-07-24 | 2018-11-30 | 河海大学 | Pipe deforming monitoring system and application method based on OFDR technology |
| CN109138006A (en) * | 2018-09-07 | 2019-01-04 | 温州市城市资源开发工程有限公司 | A kind of underground parking well construction with vibrating string type sensor and unidirectional RF chip |
| CN109187194A (en) * | 2018-10-26 | 2019-01-11 | 南京大学 | A kind of soil body tensioning mechanical characteristic fiber-optic monitoring based on OFDR and test method and device |
| CN109357626A (en) * | 2018-11-30 | 2019-02-19 | 中国十七冶集团有限公司 | A kind of construction method of counterfort wall strain monitoring |
| CN109827074A (en) * | 2019-02-01 | 2019-05-31 | 河海大学 | Sewage conduct health monitoring and rupture pre-warning function system and method based on OFDR |
| CN110925602A (en) * | 2019-11-15 | 2020-03-27 | 河海大学 | Oil and gas pipeline corrosion and leakage monitoring and early warning system and method based on OFDR optical fiber sensing |
| CN110984108A (en) * | 2019-11-15 | 2020-04-10 | 河海大学 | Deep horizontal displacement and underground water level integrated monitoring and early warning system and method based on OFDR |
| CN112962620A (en) * | 2021-02-24 | 2021-06-15 | 熊建煌 | Reinforcing device for foundation pit and reinforcing method thereof |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108917635A (en) * | 2018-07-24 | 2018-11-30 | 河海大学 | Pipe deforming monitoring system and application method based on OFDR technology |
| CN109138006A (en) * | 2018-09-07 | 2019-01-04 | 温州市城市资源开发工程有限公司 | A kind of underground parking well construction with vibrating string type sensor and unidirectional RF chip |
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| CN109357626A (en) * | 2018-11-30 | 2019-02-19 | 中国十七冶集团有限公司 | A kind of construction method of counterfort wall strain monitoring |
| CN109827074B (en) * | 2019-02-01 | 2021-02-26 | 河海大学 | Sewage pipeline health monitoring and breakage early warning system and method based on OFDR |
| CN109827074A (en) * | 2019-02-01 | 2019-05-31 | 河海大学 | Sewage conduct health monitoring and rupture pre-warning function system and method based on OFDR |
| CN110984108A (en) * | 2019-11-15 | 2020-04-10 | 河海大学 | Deep horizontal displacement and underground water level integrated monitoring and early warning system and method based on OFDR |
| CN110984108B (en) * | 2019-11-15 | 2021-07-09 | 河海大学 | Deep horizontal displacement and underground water level integrated monitoring and early warning system and method based on OFDR |
| CN110925602B (en) * | 2019-11-15 | 2021-09-24 | 河海大学 | Oil and gas pipeline corrosion and leakage monitoring and early warning system and method based on OFDR optical fiber sensing |
| CN110925602A (en) * | 2019-11-15 | 2020-03-27 | 河海大学 | Oil and gas pipeline corrosion and leakage monitoring and early warning system and method based on OFDR optical fiber sensing |
| CN112962620A (en) * | 2021-02-24 | 2021-06-15 | 熊建煌 | Reinforcing device for foundation pit and reinforcing method thereof |
| CN112962620B (en) * | 2021-02-24 | 2023-04-28 | 领航建工(杭州)有限公司 | Reinforcing device for foundation pit and reinforcing method thereof |
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