CN103673896A - Distributed optical fiber measurement method and system for dam body full-cross-section horizontal displacement monitoring - Google Patents
Distributed optical fiber measurement method and system for dam body full-cross-section horizontal displacement monitoring Download PDFInfo
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Abstract
Provided are a distributed optical fiber measurement method and a system for dam body full-cross-section horizontal displacement monitoring. A deformation monitoring pipeline is embedded inside a dam, a telescopic pipe connector is installed each deformation monitoring pipeline section, and an anchoring plate of the connector is fixed inside a dam body. A sensing optical fiber is installed inside the deformation monitoring pipeline and synchronously deforms with the dam. An optical fiber fastening, fixing and pre-tensioning device enables the sensing optical fiber to be fixed on each telescopic pipe connector of the deformation monitoring pipeline. An externally-arranged horizontal displacement measuring point device ensures that each telescopic pipe connector synchronously displaces with the dam. The sensing optical fiber installed inside the deformation monitoring pipeline comprises a strain optical fiber and a temperature optical fiber. A tensioned sensing optical fiber is driven to enable stress of the sensing optical fiber to change when measuring points displace inside the dam, the strain optical fiber in the sensing optical fiber is connected into a distributed optical fiber collecting instrument to perform real-time measurement on the stress of the sensing optical fiber. In addition, temperature compensation correction is performed on the sensing optical fiber, and then acquired data are processed and analyzed to obtain full-cross-section horizontal displacement change inside the dam body.
Description
Technical field
The invention belongs to earth and rockfill dam monitoring technical field; Be specifically related to the distribution type fiber-optic measuring method of the full section horizontal displacement monitoring of a kind of dam body.The invention still further relates to the distribution type fiber-optic measuring system of the full section horizontal displacement monitoring of dam body that the distribution type fiber-optic measuring method of the full section horizontal displacement monitoring of this dam body used.
Background technology
Reservoir dam internal modification comprises vertical sedimentation and the horizontal shift of dam body inside, during this distortion overrun, directly affects the security of dam.According to < < safety monitoring of earth-rockfill dams technical manual > > (SL551-2012), at the inner section of selecting to want Deformation Monitoring of dam body, layout observation instrument is monitored.Earth and rockfill dam internal modification monitoring both at home and abroad at present adopts " waterpipe type " settlement gauge to measure vertical deformation conventionally, and adopts " drawing bracing cable formula " horizontal displacement meter to measure the method for horizontal distortion.These two kinds of methods are all when dam fills the monitoring elevation of design code, in dam inside, be from upstream in advance downstream and arrange one perpendicular to the monitoring pipeline of the axis of dam, in this pipeline, install simultaneously and bury " waterpipe type " settlement gauge and " drawing bracing cable formula " horizontal displacement meter underground.
Yet the waterpipe type settlement gauge using at present and when drawing bracing cable displacement meter and surpassing 200m, length of pipe and surpass 500m for height of dam, makes the Measuring Time of instrument lengthen in a large number because pipeline is oversize, sensitivity, error increases greatly.
Height of dam increases, draw bracing cable formula horizontal displacement meter and waterpipe type settlement gauge draw bracing cable and water pipe line length increases with nearly 3 times of increases to height of dam, cause drawing bracing cable and water pipe line length increases greatly.Wherein draw rolling up of bracing cable indium steel wire length, for guarantee in measuring process indium steel wire draw bracing cable in exceptionally straight state accurately to transmit measuring point horizontal shift, must roll up and draw bracing cable counterweight, indium steel wire is pulled off because of undercapacity; Rolling up of water pipe line length, the difficulty that causes waterpipe type settlement gauge to be filled with water to settlement gauge by pipeline increases greatly, and rolling up due to water pipe line, water level balance process and the time of its measurement mechanism and settlement gauge overflow water tumbler will be multiplied, thereby affect the measurement accuracy of waterpipe type settlement gauge.
Drawing each measuring point of bracing cable formula horizontal displacement meter need to configure an indium steel wire and draw bracing cable and counterweight, same each measuring point of waterpipe type settlement gauge all needs a set of water pipe and tracheae pipeline, along with height of dam increases, corresponding measuring point also synchronously increases, the also corresponding increase of the pipeline quantity of drawing bracing cable quantity and settlement gauge of horizontal displacement meter, to protection tube size, separated time and guide frame, the requirement of the indexs such as intensity also improves greatly, and the These parameters of protection tube also can not improve unlimitedly in earth and rockfill dam, especially for 300m level earth and rockfill dam, due to its measuring point designing requirement quantity nearly 3 times to the measuring point quantity of hundred meter level earth and rockfill dams, that draws bracing cable formula horizontal displacement meter and waterpipe type settlement gauge draws bracing cable and water pipe for enrockment dam body inside, the protection pipeline of snorkel pipeline and technology are also one of difficult problems that is difficult to overcome.
Recently China's earth and rockfill dam its construction level has had large increase, along with the quickening of Western Hydroelectricity Developing process, has carried out the senior earth and rockfill dam dam construction technique of 300m and dam safety monitoring technical research.The bottom cross-sectional length of this superelevation dam surpasses 800m, for mono-of dam body inside 800m, measures on pipeline and needs to arrange tens measuring points, obviously cannot continue to use traditional waterpipe type settlement gauge and draw bracing cable displacement meter method monitoring dam body internal modification.For the measurement range of this overlength, there is no at present effective monitoring means and method both at home and abroad, be badly in need of developing the new type measuring instrument device of monitoring dam body internal modification.
Summary of the invention
The technical matters that will solve required for the present invention is, overcome existing technological deficiency, provide a kind of structure that adopts distribution type fiber-optic to measure horizontal shift in the monitoring of dam body internal modification, thereby this employing distribution type fiber-optic is measured the structure of horizontal shift and can be measured in sensor fibre strain fibre strain and distribute and draw the variation of the inner full section horizontal shift of dam body.The present invention also provides this employing distribution type fiber-optic to measure the measuring method of horizontal shift in the monitoring of dam body internal modification.
For reaching above-mentioned purpose, the present invention proposes the distribution type fiber-optic measuring method of the full section horizontal displacement monitoring of a kind of dam body, is a kind of structure and measuring method device that adopts distribution type fiber-optic to measure horizontal shift in the monitoring of dam body internal modification, comprises the following steps:
(1). in dam inside, bury one underground perpendicular to the deformation monitoring pipeline of the large axis of dam;
(2). on every joint deformation monitoring pipeline, every a segment distance, pipe expansion joint is installed, the anchor plate of this pipe expansion joint is fixed on dam body inside; When dam body inside is subjected to displacement, thereby drive deformable monitoring pipeline to be subjected to displacement, drive sensor fibre to be subjected to displacement;
(3). each pipe expansion joint, with sealing ring, prevents that the inner silt of dam and water slurry from entering tube passage
(4). a sensor fibre is installed in the middle of this deformation monitoring pipe interior, and this sensor fibre is along with dam deform in same pace;
(5). at each pipe expansion joint place of deformation monitoring pipeline, adopt fastening the fixing with pretension fixing device of optical fiber sensor fibre to be fixed on each pipe expansion joint of deformation monitoring pipeline, and keep sensor fibre exceptionally straight;
(6). in deformation monitoring pipeline, in the sensor fibre of installation, include strain optical fiber (tightly overlapping stressed optical fiber) and optical fiber temperature (pine is overlapped the optical fiber that do not stress);
(7). at the pipe expansion joint outer setting horizontal shift point equipment of deformation monitoring pipeline, guarantee that pipe expansion joint is with dam synchronous shift;
(8). when each measuring point is subjected to displacement in dam body inside, exceptionally straight sensor fibre is driven, thereby the strain fibre strain of sensor fibre changes, strain optical fiber access distribution type fiber-optic acquisition instrument in sensor fibre, by distribution type fiber-optic acquisition instrument, the strain of sensor fibre is measured in real time;
(9). when the strain of sensor fibre is carried out measuring in real time, measure the temperature variation of optical fiber temperature in sensor fibre;
(10). according to the temperature variation of optical fiber temperature, strain optical fiber is carried out to temperature compensation correction; Again the data that gather are carried out to Treatment Analysis, show that the inner full section horizontal shift of dam body changes.
Described " every a segment distance ", suggestion adopts the distance every 6 meters.
The technical scheme that completes second invention task of the application is, the distribution type fiber-optic measuring system of the full section horizontal displacement monitoring of dam body that the distribution type fiber-optic measuring method of the full section horizontal displacement monitoring of above-mentioned dam body is used, is embedded with one perpendicular to the deformation monitoring pipeline of the large axis of dam in dam inside; This deformation monitoring pipeline is connected to form by some joints, on every joint deformation monitoring pipeline, pipe expansion joint is installed, and the anchor plate of this pipe expansion joint is fixed on dam body inside; In the middle of this deformation monitoring pipe interior, sensor fibre is installed, it is characterized in that, described sensor fibre is fixed and is strained by fastening the fixing with pretension fixing device of optical fiber; Based on above thinking, adopt a sensor fibre the inside to put two kinds of dissimilar optical fiber, a kind of tight cover is subject to stress-strain optical fiber direct to connect sheath protection, for measuring the change in displacement of dam body, another kind of pine is overlapped the optical fiber temperature that do not stress, with plastic casing protection, for measuring optical fiber present position temperature variation, for the temperature compensation of strain optical fiber; ; Described sensor fibre is connected in distribution type fiber-optic acquisition instrument.
Distribution type fiber-optic acquisition instrument is measured respectively in real time to the temperature of the strain of the strain optical fiber of sensor fibre and the optical fiber temperature that do not stress, then the data that gather are carried out to Treatment Analysis, can show that the full section horizontal shift of dam body changes.
Described sensor fibre (tight tube fiber) adopts direct sheath protection, for measuring the change in displacement of dam body; Described optical fiber temperature (pine is overlapped the optical fiber that do not stress), adopts plastic casing protection;
Each expansion pipe joint of deformation monitoring pipeline all arranges the fastening fixing and pretension fixing device pilot hole of optical fiber.
Described deformation monitoring pipeline is formed by connecting by more piece monitoring and protecting pipe, and each saves between monitoring and protecting pipe and is connected by pipe expansion joint, and this pipe expansion joint, all with sealing ring, prevents that the inner silt of dam and water slurry from entering tube passage, and installs and bury simple, convenience underground.
On the fastening fixing and pretension fixing device of optical fiber, be provided with a roll adjustment hole, exceptionally straight, tension sensor fibre on request, meets the requirement of dam body inner horizontal displacement measurement after sensor fibre is installed.
Fastening the fixing with pretension fixing device of optical fiber is comprised of laterally zygomorphic two parts, fastening the fixing with pretension fixing device centre of optical fiber has a draw-in groove, draw-in groove is than the very thin 1-2mm of the sense light of institute type selecting, and fastening the fixing with the rear sensor fibre of pretension fixing device 2 compression of optical fiber can be fixed and do not slided.On the fastening fixing and pretension fixing device of each optical fiber, have 4 fastening fixing and pretension fixing device fastener holes of threaded optical fiber, with screw rod, the fastening fixing and pretension fixing device of optical fiber is tightened, the fastening fixing and pretension fixing device of optical fiber compresses rear sensor fibre and can fix and do not slide; Can after with adjusting screw, be screwed into the fastening fixing and pretension fixing device roll adjustment hole of optical fiber, one end is positioned on pipe expansion joint, tightens on request screw rod the exceptionally straight tension of sensor fibre.
Sensor fibre measuring accuracy is 0.2%F.S, and measuring accuracy is high, meets the accuracy requirement of earth and rockfill dam inner horizontal displacement measurement.
In other words, the principle of work of method and apparatus of the present invention is:
In dam inside, bury one underground perpendicular to the deformation monitoring pipeline of the large axis of dam, it is along with dam deform in same pace, deformation monitoring pipeline adds an expansion pipe joint every 6 meters, sensor fibre is placed in deformation monitoring pipeline and protects, fastening the fixing with pretension fixing device of optical fiber of designing in each pipe expansion joint place of deformation monitoring pipeline adopts the present invention is fixed on sensor fibre on each pipe expansion joint of deformation monitoring pipeline and keeps sensor fibre exceptionally straight, pipe expansion joint outer setting horizontal shift point equipment at deformation monitoring pipeline guarantees that deformation monitoring pipeline is with dam synchronous shift, when each dam body inside, measuring point place is subjected to displacement, exceptionally straight sensor fibre is driven, thereby the strain of sensor fibre changes.
When dam body inside is subjected to displacement, thereby drive deformable monitoring pipeline to be subjected to displacement, drive sensor fibre to deform; Strain optical fiber and optical fiber temperature in sensor fibre are accessed respectively to distribution type fiber-optic acquisition instrument, by distribution type fiber-optic acquisition instrument, the temperature of the strain of the strain optical fiber of sensor fibre and the optical fiber temperature that do not stress is measured respectively in real time, again the data that gather are carried out to Treatment Analysis, can show that the full section horizontal shift of dam body changes.
The temperature variation of optical fiber temperature in sensor fibre, can carry out temperature compensation correction to sensor fibre.
In other words, monitoring method of the present invention more comprises following steps:
Each pipe expansion joint outer setting horizontal shift point equipment at horizontal shift deformation monitoring pipeline, it is horizontal displacement drive sensor fibre to deform with dam deformation, full institute deforms to change, can adopt distribution type fiber-optic to measure dam body section horizontal displacement monitoring system to measure.
Based on above thinking; adopt a sensor fibre the inside to put two kinds of dissimilar optical fiber; the direct sheath protection of a kind of tight tube fiber; for measuring the change in displacement of dam body; another kind of pine is overlapped the optical fiber that do not stress; with plastic casing protection, for measuring optical fiber present position temperature variation, for temperature compensation.When dam body inside is subjected to displacement variation, sensor fibre deforms with dam body synchronous shift.
Before sensor fibre Embedment and installation, must exceptionally straightly strain, every 6 meters, there iing the place of pipe expansion joint that a fastening fixing and pretension fixing device of optical fiber is installed, fastening the fixing with pretension fixing device of optical fiber can compress sensor fibre, sensor fibre can not be slided, fastening fixing and an adjusting screw is installed above pretension fixing device at optical fiber, adjusting screw one end is positioned at one end of pipe expansion joint, can freely be screwed into and back-out, and adjusting screw can be by the requirement of measuring the exceptionally straight tension of sensor fibre; Every installation is just fixed and pretension fixing device compression and exceptionally straight sensor fibre with optical fiber is fastening after burying a joint deformation monitoring pipeline and pipe expansion joint underground on request, by as the method, sensor fibre exceptionally straight tension always being installed to the outside of burying deformation monitoring pipeline underground; Externally adopt distribution type fiber-optic Acquisition Instrument to measure the strain of strain optical fiber and the temperature variation of optical fiber temperature of sensor fibre, thereby obtain the full face horizontal shift of dam body, change.
More optimize and more particularly, described in method of the present invention, adopting is that equipment is: a kind of distribution type fiber-optic that adopts is measured the structure of horizontal shift and the monitoring system of measuring method in dam internal modification monitoring, comprise: be embedded in monitoring pipeline dam inside and that be out of shape with dam internal modification, one and be arranged in this monitoring pipeline and for monitoring sensor fibre and an external distributed collecting fiber instrument of dam internal modification, measure strain and the temperature variation of distribution type fiber-optic, thereby draw the full face horizontal shift of dam body, wherein:
Described deformation monitoring pipeline comprises:
Article one, be positioned at the deformation monitoring pipeline of dam body, a sensor fibre of each fastening installation in pipe expansion joint place of deformation monitoring pipe interior;
Several are arranged at the horizontal shift point equipment of described deformation monitoring pipeline external, and its horizontal distortion with dam moves horizontally, and drive is imbedded the sensor fibre synchronous shift in deformation monitoring pipeline and deforms.
Further, described deformation monitoring pipeline is formed by connecting by more piece protection tube and the pipe expansion joint that is connected between each protection tube, to form the installation passage of sensor fibre.
Further, two kinds of dissimilar optical fiber are put in sensor fibre the inside, the direct sheath protection of a kind of tight tube fiber, and for measuring the change in displacement of dam body, another kind of pine is overlapped the optical fiber that do not stress, with plastic casing protection, for measuring optical fiber present position temperature variation.
Further, sensor fibre must exceptionally straightly be strained before burying underground, exceptionally straight tightening structure device has the fastening fixing and pretension fixing device of optical fiber, fastening fixing and an adjusting screw is housed above pretension fixing device at optical fiber, at sensor fibre, installs while burying underground on request the exceptionally straight tension of sensor fibre.
From the above technical solution of the present invention shows that, monitoring method of the present invention and monitoring system have adopted a kind of mode that adopts distribution type fiber-optic to measure the full section horizontal displacement monitoring of dam body system, by burying underground in dam inside, arrange special-purpose deformation monitoring pipeline, deformation monitoring pipe interior is installed sensor fibre, the sensor fibre that adopts collecting fiber instrument to bury deformation monitoring pipe interior underground to installing measures to realize monitoring, the directly distortion of monitoring dam body inside, especially be applicable to the internal modification monitoring to superelevation overlength dam, and the measuring accuracy that adopts distribution type fiber-optic to measure the full section horizontal displacement monitoring of dam body system is 0.2%F.S, measuring accuracy is high, guaranteed monitoring system accuracy, meet the requirement of earth and rockfill dam inner horizontal displacement monitoring.
Accompanying drawing explanation
Fig. 1 is that the present invention adopts distribution type fiber-optic to measure the structural representation of the full section horizontal displacement monitoring of dam body system;
Fig. 2 is erecting device structural representation of the present invention;
Fig. 3-1, Fig. 3-2nd, the fastening fixing and pretension fixing device structural representation of sensor fibre of the present invention;
Fig. 4 is deformation monitoring pipeline configuration schematic diagram of the present invention;
Fig. 5 is sensor fibre schematic cross-section of the present invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and concrete case study on implementation, the inventive method is described in further detail.Concrete case study on implementation described herein, only in order to explain the present invention, is not intended to limit the present invention.
With reference to Fig. 1: fill the section of design code Embedment and installation horizontal shift distortion and bury elevation than design code underground until earth and rockfill dam and exceed after 0.5 meter, in design code Embedment and installation position, dig the instrument ditch of 0.6 * 0.6 meter, an anchor block that fixes sensor fibre 3 is installed in inside in Measurement of Dam, and sensor fibre 3 penetrates deformation monitoring pipeline 1.In the instrument ditch the inside of digging, install and bury deformation monitoring pipeline 1 underground, the every joint length of deformation monitoring pipeline 1 is 6m; On every joint deformation monitoring pipeline 1, pipe expansion joint 5 is installed, the anchor plate 4 of pipe expansion joint 5 is fixed on dam body inside, and it is horizontal displacement drive sensor fibre 3 to deform with dam deformation; At pipe expansion joint 5, there is one end of pilot hole 12, with fastening fixing with pretension fixing device 2 of optical fiber, the exceptionally straight tension of sensor fibre 3 is also fixed on to corresponding dam body position by this pipe expansion joint 5 and anchor plate 4 simultaneously, by as the method, sensor fibre exceptionally straight tension being always installed to observation room 7, at 6 pairs of sensor fibres of observation room 7 use distribution type fiber-optic Acquisition Instruments 3, carry out Real-time Collection, and image data is carried out to real-time analysis processing, draw dam inner horizontal deformation monitoring result.
With reference to Fig. 2: the every installation of monitoring and protecting pipe 8 has been buried underground after a joint, and anchor plate 4 and pipe expansion joint 5 are installed, and anchor plate 4 is fixed on corresponding dam body position; Pipe expansion joint 5 has the fastening fixing and pretension fixing device 2 of the fastening one end installing optical fibres fixing and pretension fixing device adjusting screw pilot hole 12 of optical fiber, after energy, fastening the fixing with fastening the fixing with pretension fixing device fastening screw 9 of pretension fixing device 2 use optical fiber of optical fiber tightened, optical fiber can not be slided, with fastening the fixing with pretension fixing device adjusting screw 10 of optical fiber, make sensor fibre 3 exceptionally straight tension on request; By that analogy, until monitoring and protecting pipe 8 and sensor fibre 3 installed has buried underground.To these formations and in conjunction with Fig. 3-Fig. 5, be introduced and illustrate respectively below:
One, the fastening fixing and pretension fixing device of optical fiber:
As shown in Fig. 3-1, Fig. 3-2, fastening the fixing with pretension fixing device 2 of optical fiber is comprised of laterally zygomorphic two parts, fastening the fixing with pretension fixing device 2 centres of optical fiber has a draw-in groove, draw-in groove is than the very thin 1-2mm of the sense light of institute type selecting, and fastening the fixing with the rear sensor fibre 3 of pretension fixing device 2 compression of optical fiber can be fixed and do not slided.On the fastening fixing and pretension fixing device 2 of each optical fiber, there are 4 fastening fixing and pretension fixing device fastener holes 14 of threaded optical fiber, with screw rod, fastening the fixing with pretension fixing device 2 of optical fiber tightened, fastening the fixing with the rear sensor fibre 3 of pretension fixing device 2 compression of optical fiber can be fixed and do not slided; Can after with adjusting screw, be screwed into the fastening fixing and pretension fixing device roll adjustment hole 13 of optical fiber, one end is positioned on pipe expansion joint 5, tightens on request screw rod the exceptionally straight tension of sensor fibre 3.
Two, deformation monitoring pipeline:
As shown in Figure 4, deformation monitoring pipeline 1 provides the passage of protection sensor fibre 3, and it is preferably the disposable dam inside that is embedded in also cannot change parts.In the present embodiment, according to the length of dam inside, deformation monitoring pipeline 1 can be formed by connecting by more piece monitoring and protecting pipe 8 and the pipe expansion joint 5 being connected between each monitoring and protecting pipe 8, and protection is arranged at sensor fibre 3 and each equipment of pipe interior.Deformation monitoring pipeline 1, with sealing ring 11, has sealing, Telescopic, and the diameter of monitoring and protecting pipe 8 is unsuitable excessive, in order to avoid dam body is exerted an influence.
Monitoring and protecting pipe 8 adopts the High Strength Steel pipe of antirust processing, diameter 200mm left and right, wall thickness 8 ~ 12mm, each joint protection tube length 6m.
When laying deformation monitoring pipeline 1, should be according to < < safety monitoring of earth-rockfill dams technical manual > > (SL551-2012) requirement, whole piece pipeline seals in dam inside, between each pipe joint road, must be to be tightly connected.
Three, sensor fibre:
As shown in Figure 5, sensor fibre 3 is selected the optical fiber with optical fiber jacket 15 and flexiplast stiffener 16, and flexiplast stiffener 16 is used for strain optical fiber 19 and the optical fiber temperature 20 of sensor fibre 3 the insides of protection, increases the force intensity that is subject to of sensor fibre 3; Sensor fibre 3 is divided into the stressed strain optical fiber of tight cover 19 and pine is overlapped the optical fiber temperature 20 not stressing; the stressed strain optical fiber 19 of tight cover; with sheath 17, directly protect; for measuring the Strain Distribution of sensor fibre 3, measure the change in displacement of dam body, another kind of is the loose optical fiber temperature 20 not stressing that overlaps; with 18 protections of center plastic tube; be used for measuring sensor fibre 3 present position temperature variation, for temperature compensation, reduce temperature to the error of measuring.
Claims (10)
1. a distribution type fiber-optic measuring method for the full section horizontal displacement monitoring of dam body, is a kind of structure and measuring method device that adopts distribution type fiber-optic to measure horizontal shift in the monitoring of dam body internal modification, comprises the following steps:
(1). in dam inside, bury one underground perpendicular to the deformation monitoring pipeline of the large axis of dam;
(2). on every joint deformation monitoring pipeline, every a segment distance, pipe expansion joint is installed, the anchor plate of this pipe expansion joint is fixed on dam body inside; When dam body inside is subjected to displacement, thereby drive deformable monitoring pipeline to be subjected to displacement, drive sensor fibre to be subjected to displacement;
(3). each pipe expansion joint, with sealing ring, prevents that the inner silt of dam and water slurry from entering tube passage
(4). a sensor fibre is installed in the middle of this deformation monitoring pipe interior, and this sensor fibre is along with dam deform in same pace;
(5). at each pipe expansion joint place of deformation monitoring pipeline, adopt fastening the fixing with pretension fixing device of optical fiber sensor fibre to be fixed on each pipe expansion joint of deformation monitoring pipeline, and keep sensor fibre exceptionally straight;
(6). in deformation monitoring pipeline, in the sensor fibre of installation, include the optical fiber temperature that the stressed strain optical fiber of tight cover and pine cover do not stress;
(7). at the pipe expansion joint outer setting horizontal shift point equipment of deformation monitoring pipeline, guarantee that pipe expansion joint is with dam synchronous shift;
(8). when each measuring point is subjected to displacement in dam body inside, exceptionally straight sensor fibre is driven, thereby the strain of sensor fibre changes, strain optical fiber access distribution type fiber-optic acquisition instrument in sensor fibre, by distribution type fiber-optic acquisition instrument, the strain of sensor fibre is measured in real time;
(9). when the strain of sensor fibre is carried out measuring in real time, measure the temperature variation of optical fiber temperature in sensor fibre;
(10). according to the temperature variation of optical fiber temperature, strain optical fiber is carried out to temperature compensation correction; Again the data that gather are carried out to Treatment Analysis, show that the inner full section horizontal shift of dam body changes.
2. the distribution type fiber-optic measuring method of the full section horizontal displacement monitoring of dam body according to claim 1, is characterized in that, described " every a segment distance ", refers to the distance every 6 meters.
3. the distribution type fiber-optic measuring method of the full section horizontal displacement monitoring of dam body according to claim 1 and 2, it is characterized in that, " keep sensor fibre exceptionally straight " of step described in (5), its method of operating is: fastening the fixing with pretension fixing device of described optical fiber is comprised of laterally zygomorphic two parts, fastening the fixing with pretension fixing device is middle of optical fiber has a draw-in groove, and draw-in groove is than the very thin 1-2mm of the sense light of institute type selecting; On the fastening fixing and pretension fixing device of each optical fiber, there are 4 fastening fixing and pretension fixing device fastener holes of threaded optical fiber, with screw rod, fixingly tighten with pretension fixing device optical fiber is fastening; Then with adjusting screw, be screwed into the fastening fixing and pretension fixing device roll adjustment hole of optical fiber, one end is positioned on pipe expansion joint, tightens on request screw rod the exceptionally straight tension of sensor fibre.
4. the distribution type fiber-optic measuring system of the full section horizontal displacement monitoring of dam body that measuring method claimed in claim 1 is used, is embedded with one perpendicular to the deformation monitoring pipeline of the large axis of dam in dam inside; This deformation monitoring pipeline is connected to form by some joints, on every joint deformation monitoring pipeline, pipe expansion joint is installed, and the anchor plate of this pipe expansion joint is fixed on dam body inside; In the middle of this deformation monitoring pipe interior, sensor fibre is installed, it is characterized in that, described sensor fibre is fixed and is strained by fastening the fixing with pretension fixing device of optical fiber; Adopt a sensor fibre the inside to be provided with two kinds of dissimilar optical fiber, the direct sheath protection of strain optical fiber that a kind of tight cover is stressed, for measuring the change in displacement of dam body, the optical fiber temperature that another kind of pine cover does not stress, with plastic casing, protect, for measuring optical fiber present position temperature variation, for the temperature compensation of strain optical fiber; Described strain optical fiber and optical fiber temperature are all connected in distribution type fiber-optic acquisition instrument.
5. the distribution type fiber-optic measuring system of the full section horizontal displacement monitoring of dam body according to claim 4, is characterized in that, described sensor fibre adopts direct sheath protection, for measuring the change in displacement of dam body; Described optical fiber temperature, adopts plastic casing protection.
6. the distribution type fiber-optic measuring system of the full section horizontal displacement monitoring of dam body according to claim 4, is characterized in that, each expansion pipe joint of described deformation monitoring pipeline all arranges the fastening fixing and pretension fixing device pilot hole of optical fiber.
7. the distribution type fiber-optic measuring system of the full section horizontal displacement monitoring of dam body according to claim 4, is characterized in that, described pipe expansion joint is all with sealing ring.
8. the distribution type fiber-optic measuring system of the full section horizontal displacement monitoring of dam body according to claim 4, is characterized in that, on the fastening fixing and pretension fixing device of described optical fiber, is provided with roll adjustment hole.
9. the distribution type fiber-optic measuring system of the full section horizontal displacement monitoring of dam body according to claim 4, it is characterized in that, fastening the fixing with pretension fixing device of described optical fiber is comprised of laterally zygomorphic two parts, fastening the fixing with pretension fixing device is middle of optical fiber has a draw-in groove, and draw-in groove is than the very thin 1-2mm of the sense light of institute type selecting; On the fastening fixing and pretension fixing device of each optical fiber, there are 4 fastening fixing and pretension fixing device fastener holes of threaded optical fiber, with screw rod, fixingly tighten with pretension fixing device optical fiber is fastening; Then with adjusting screw, be screwed into the fastening fixing and pretension fixing device roll adjustment hole of optical fiber, one end is positioned on pipe expansion joint, tightens on request screw rod the exceptionally straight tension of sensor fibre.
10. according to the distribution type fiber-optic measuring system of the full section horizontal displacement monitoring of dam body one of claim 4-9 Suo Shu, it is characterized in that, described sensor fibre measuring accuracy is 0.2%F.S.
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| CN112880610A (en) * | 2021-01-21 | 2021-06-01 | 唐山学院 | Connecting device and equipment and method for directly monitoring horizontal displacement of inner pipe of pipeline |
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| CN114543679A (en) * | 2022-01-17 | 2022-05-27 | 山东希尔电缆有限公司 | Distributed optical fiber online monitoring system for highway subgrade displacement and strain |
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