CN104482855A - Foundation pit slide surface position monitoring method based on FBG (fiber bragg grating) - Google Patents
Foundation pit slide surface position monitoring method based on FBG (fiber bragg grating) Download PDFInfo
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- CN104482855A CN104482855A CN201410659677.6A CN201410659677A CN104482855A CN 104482855 A CN104482855 A CN 104482855A CN 201410659677 A CN201410659677 A CN 201410659677A CN 104482855 A CN104482855 A CN 104482855A
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Abstract
The invention discloses a foundation pit slide surface position monitoring method based on FBG (fiber bragg grating). The foundation pit slide surface position monitoring method comprises the following steps of arranging an U-shaped FGB string on an inclinometer tube, arranging the inclinometer tube in a drilling hole which is formed in a to-be-monitored slide surface, adopting a FBG demodulation instrument to monitor the change of the FGB on the inclinometer tube in real time, calculating the average strain of each cross section of the inclinometer tube, judging the position of the foundation pit slide surface according to the change of the strain value, and the like. The foundation pit slide surface position monitoring method has the advantages that the operation is convenient and rapid, the safety and reliability are realized, and the monitoring method is suitable for performing real-time and long-time monitoring on the foundation pit slide surface.
Description
Technical field
The present invention relates to a kind of pit retaining monitoring method, be specifically related to a kind of foundation ditch sliding surface position monitoring method based on fiber grating.
Background technology
In the observation process that deep pit monitor is stable; generally need to carry out long term monitoring to Foundation Pit, sedimentation, water level; sometimes because soil mass of foundation pit unstability causes foundation ditch to have slipping plane, in order to ensure the safety of foundation ditch, the sliding surface position that foundation ditch is possible is needed to be grasped.The current equipment such as monitoring means many employings spirit-leveling instrument, total powerstation carries out personal monitoring, and the promptness of its data and the convenient degree of measurement have been difficult to the needs meeting foundation ditch real-time measurement.And fiber-optic grating sensor is a kind of novel sensor, have electromagnetism interference, the features such as electrical insulation capability is good, safe and reliable, corrosion-resistant, are applied in numerous engineering monitoring field.Develop a kind of foundation ditch sliding surface position monitoring method based on fiber grating and become technical matters urgently to be resolved hurrily.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, the invention provides a kind of foundation ditch sliding surface position monitoring method based on fiber grating, with Real-Time Monitoring foundation ditch sliding surface position.
Technical scheme: for solving the problems of the technologies described above, the foundation ditch sliding surface position monitoring method based on fiber grating provided by the invention, comprises the following steps:
A, paste in inclinometer pipe edge the U-shaped fiber grating string that line is arranged symmetrically with centered by inclinometer pipe axis;
B, to hole near the slipping plane that foundation ditch is possible, the inclinometer pipe laying fiber grating one is saved and transfers in boring in order;
The change of fiber grating on c, employing FBG (FBG) demodulator Real-Time Monitoring inclinometer pipe, utilizes following formulae discovery to go out the mean strain ε z in each cross section of inclinometer pipe:
In formula, be displacement 0 point bottom note inclinometer pipe, if z place bottom distance inclinometer pipe, the front and back symmetric fiber grating wavelength value at this some position place is λ z1, λ z2, and its initial measurement wavelength is λ z10, λ z20;
D, in Excavation Process, according to a certain position fiber grating survey strain value change judge foundation ditch sliding surface position.
Particularly, in described step a, in inclinometer pipe, fiber-optic grating sensor laying step is as follows:
A1, on inclinometer pipe, choose laterally zygomorphic groove, paste circuit as fiber grating; Selected groove marks the installation position of the fine optical grating point of bright dipping;
A2, fiber grating string are that U-shaped symmetry is pasted up and down, and U-shaped centre needs the protective casing more protection penetrating 5mm, bottom inclinometer pipe, walk around bossing, by both sides fiber grating along entering in laying groove, use adhesive tape temporary fixed U-shaped bottom sheath;
A3, a little moving fiber grating string, make fiber grating point reach predetermined cloth and to set up an office position, uses Instant cement to be pasted and fixed on by optical grating point in inclinometer pipe groove;
A4, use epoxide-resin glue U-shaped bottom sheath and fiber grating string to be pasted to cover fixing, protection fiber grating, uses cloth base adhesive tape that U-shaped bottom is wound around protection comprehensively, and will smear colloid circuit and to fit covering protection.
Particularly, in described step b inclinometer pipe to transfer step as follows:
B1, by pasting the inclinometer pipe of packaged fiber-optic grating sensor, slowly to put in boring, rotate inclinometer pipe make before and after to be pasted with the plane of fiber grating parallel with Rock And Soil main sliding direction;
B2, according to fiber grating bonding method, successively inclinometer pipe merogenesis to be installed.Optical fiber inclinometer pipe should slowly be transferred, until final section inclinometer pipe.Attention should carry out corresponding fiber-optic wire joint mark, realizes corresponding fiber grating burial place depth registration.
B3, until inclinometer pipe soon lower to predetermined depth place time, each bar FBG lead-in wire is left the fiber-optic wire of sufficient length, with cloth base adhesive tape, fiber-optic wire is pasted and fixed on inclinometer pipe, and reserved certain length optical fiber is as connecting lead wire;
After b4, inclinometer pipe are transferred, adopt sand backfill sealing of hole, slowly should drop into sand during backfill, and jiggle inclinometer pipe, sand is fully filled.
As preferably, described inclinometer pipe is aluminium alloy inclinometer pipe.
As preferably; before inclinometer pipe is imbedded in boring; inclinometer pipe and fiber-optic grating sensor are protected; step is as follows: fiber-optic wire is put into inclinometer pipe inside; the PVC sleeve pipe being inserted in diameter 200mm in inclinometer pipe outside is protected, and also other modes can be adopted to protect optical fiber inclinometer pipe according to actual conditions.
Inventive principle: when inclinometer pipe occurs bending and deformation, is implanted the optic fiber grating wavelength changing value on inclinometer pipe surface, can obtain inclinometer pipe and be out of shape lower strain value by bending by test.Optic fiber grating wavelength often changes 0.001nm, and the corresponding strain value of inclinometer pipe is 1 μ ε (microstrain).Inclinometer pipe distortion tension side, side pressurized, its strain can be tried to achieve by the symmetrical fiber grating pasted.Inclinometer pipe presents maximal value in the cross section mean strain at slipping plane place, and overall strain curve is given prominence to herein, illustrates there is slipping plane herein.
Beneficial effect: the invention provides a kind of new foundation ditch sliding surface position monitoring method, can monitor foundation ditch most dangerous sliding surface accurately, compared with traditional tiltmeter, fiber-optic grating sensor observation process is simpler, fast, can be used for monitoring the slipping plane of foundation ditch.Fiber-optic grating sensor has safe and reliable, corrosion-resistant, the features such as stable chemical performance, can be used for long term monitoring and Real-Time Monitoring.Optical fiber bragg grating FBG (Fiber Bragg Grating) technology has the characteristic that transmission unites two into one with sensing medium, the FBG with different pitch is made on same optical fiber diverse location, wavelength-division multiplex technique is adopted to realize the quasi-distributed measurement of stress and temperature, make all to become sensitive element along the grating on fiber deployment path, thus realize quasi-distributed measurement.
Except technical matters, the technical characteristic forming technical scheme and the advantage brought by the technical characteristic of these technical schemes that the present invention recited above solves, the advantage that other technologies problem, the other technologies feature comprised in technical scheme and these technical characteristics that can solve based on the foundation ditch sliding surface position monitoring method of fiber grating of the present invention brings, will be described in more detail by reference to the accompanying drawings.
Accompanying drawing explanation
Fig. 1 is the structural representation of inclinometer pipe in the embodiment of the present invention;
Fig. 2 is the cross-sectional view of Fig. 1;
Fig. 3 is the using state schematic diagram of Fig. 1;
In figure, 1 inclinometer pipe, 2 fiber-optic wires, 3 fiber-optic grating sensors, 4 U-shaped bottom sheaths, 5 foundation ditches, 6 slipping planes.
Embodiment
Embodiment:
The monitoring of the present embodiment application foundation ditch sliding surface position as depicted in figs. 1 and 2, comprise inclinometer pipe 1, U-shaped fiber grating string is pasted with in its edge, U-shaped fiber grating string line centered by inclinometer pipe 1 axis is arranged symmetrically with, and comprises fiber-optic wire 2 and compartment of terrain distribution fiber-optic grating sensor 3 thereon.The U-shaped bottom sheath 4 for the protection of fiber grating string is arranged with in the bottom of inclinometer pipe 1.
During use, as shown in Figure 3, the possible slipping plane 6 of foundation ditch 5 side is holed, and inclinometer pipe 1 is transferred in boring, the plane being pasted with fiber grating before and after making is parallel with Rock And Soil main sliding direction, and the line namely on U-shaped fiber grating string between the fiber grating of both sides is on Rock And Soil main sliding direction.By intelligent acess FBG (FBG) demodulator, the change of fiber grating on Real-Time Monitoring inclinometer pipe 1, calculates the mean strain in each cross section of inclinometer pipe.
When in Excavation Process, if when possibility slipping plane appears in foundation ditch, the inclinometer pipe being embedded in this position can occur bending and deformation, implanted the optic fiber grating wavelength changing value on inclinometer pipe surface by test, inclinometer pipe can be obtained and be out of shape lower strain value by bending.Optic fiber grating wavelength often changes 0.001nm, and the corresponding strain value of inclinometer pipe is 1 μ ε (microstrain).Inclinometer pipe distortion tension side, side pressurized, its strain can be tried to achieve by the symmetrical fiber grating pasted.Inclinometer pipe presents maximal value in the cross section mean strain at slipping plane place, and overall strain curve is obviously given prominence to herein, then can judge that the position of corresponding fiber grating on inclinometer pipe is as foundation ditch sliding surface position.
Below by reference to the accompanying drawings embodiments of the present invention are described in detail, but the present invention is not limited to described embodiment.For those of ordinary skill in the art, in the scope of principle of the present invention and technological thought, embodiment is carried out to these embodiments and carries out multiple change, amendment, replacement and distortion and still fall within the scope of protection of the present invention.
Claims (6)
1., based on a foundation ditch sliding surface position monitoring method for fiber grating, it is characterized in that comprising the following steps:
A, paste in inclinometer pipe edge the U-shaped fiber grating string that line is arranged symmetrically with centered by inclinometer pipe axis;
B, to hole near the slipping plane that foundation ditch is possible, the inclinometer pipe laying fiber grating one is saved and transfers in boring in order;
The change of fiber grating on c, employing FBG (FBG) demodulator Real-Time Monitoring inclinometer pipe, utilizes following formulae discovery to go out the mean strain ε z in each cross section of inclinometer pipe:
In formula, be displacement 0 point bottom note inclinometer pipe, if z place bottom distance inclinometer pipe, the front and back symmetric fiber grating wavelength value at this some position place is λ z1, λ z2, and its initial measurement wavelength is λ z10, λ z20;
D, in Excavation Process, according to a certain position fiber grating survey strain value change judge foundation ditch sliding surface position.
2. the foundation ditch sliding surface position monitoring method based on fiber grating according to claim 1, is characterized in that: in described step a, in inclinometer pipe, fiber-optic grating sensor distribution method is as follows:
A1, on inclinometer pipe, choose laterally zygomorphic groove, paste circuit as fiber grating; Selected groove marks the installation position of the fine optical grating point of bright dipping;
A2, fiber grating string are that U-shaped symmetry is pasted up and down, and U-shaped centre needs the protective casing more protection penetrating 5mm, bottom inclinometer pipe, walk around bossing, by both sides fiber grating along entering in laying groove, use adhesive tape temporary fixed U-shaped bottom sheath;
A3, a little moving fiber grating string, make fiber grating point reach predetermined cloth and to set up an office position, uses Instant cement to be pasted and fixed on by optical grating point in inclinometer pipe groove;
A4, use epoxide-resin glue U-shaped bottom sheath and fiber grating string to be pasted to cover fixing, protection fiber grating, uses cloth base adhesive tape that U-shaped bottom is wound around protection comprehensively, and will smear colloid circuit and to fit covering protection.
3. the foundation ditch sliding surface position monitoring method based on fiber grating according to claim 1, is characterized in that: in described step b, the pay-off method of inclinometer pipe is as follows:
B1, by pasting the inclinometer pipe of packaged fiber-optic grating sensor, slowly to put in boring, rotate inclinometer pipe make before and after to be pasted with the plane of fiber grating parallel with Rock And Soil main sliding direction;
B2, according to fiber grating bonding method, successively inclinometer pipe merogenesis to be installed; And fiber-optic wire joint is made to the mark of the corresponding fiber grating burial place degree of depth;
B3, until inclinometer pipe soon lower to predetermined depth place time, each bar FBG lead-in wire is left the fiber-optic wire of sufficient length, with cloth base adhesive tape, fiber-optic wire is pasted and fixed on inclinometer pipe, and reserved certain length optical fiber is as connecting lead wire;
After b4, inclinometer pipe are transferred, adopt sand backfill sealing of hole, slowly should drop into sand during backfill, and jiggle inclinometer pipe, sand is fully filled.
4. the foundation ditch sliding surface position monitoring method based on fiber grating according to claim 1, is characterized in that: described inclinometer pipe is aluminium alloy inclinometer pipe.
5. the foundation ditch sliding surface position monitoring method based on fiber grating according to claim 1, is characterized in that: before inclinometer pipe is imbedded in boring, protect inclinometer pipe and fiber-optic grating sensor.
6. the foundation ditch sliding surface position monitoring method based on fiber grating according to claim 5, is characterized in that: described protected mode is that fiber-optic wire is put into inclinometer pipe inside, and is inserted in the PVC sleeve pipe of diameter 200mm in inclinometer pipe outside.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410659677.6A CN104482855A (en) | 2014-11-19 | 2014-11-19 | Foundation pit slide surface position monitoring method based on FBG (fiber bragg grating) |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105588586A (en) * | 2015-12-11 | 2016-05-18 | 电子科技大学 | Optical fiber distributed sensing system of U-type sensing fiber deployment structure |
| CN105780752A (en) * | 2016-03-24 | 2016-07-20 | 河海大学 | Distributed optical fiber monitoring method for horizontal displacement of support structure of foundation pit |
| CN106096292A (en) * | 2016-06-17 | 2016-11-09 | 中南大学 | Determine main glide direction and the monitoring device of main sliding surface of potential Sliding Slopes and determine method |
| CN107131836A (en) * | 2017-06-01 | 2017-09-05 | 中国人民解放军理工大学 | It is a kind of while landslide monitoring sensor and its application of the inside and outside displacement field of measurement |
| CN107620300A (en) * | 2017-09-18 | 2018-01-23 | 中国电建集团华东勘测设计研究院有限公司 | A kind of Foundation Pit bottom resilience quantity monitoring method |
| CN108534730A (en) * | 2018-06-14 | 2018-09-14 | 昆山市建设工程质量检测中心 | A kind of device for measuring soil body deeply mixing cement-soil pile and surface settlement in real time |
| CN108756856A (en) * | 2018-06-21 | 2018-11-06 | 广东赛达交通科技股份有限公司 | A kind of construction method of distribution type fiber-optic drillhole inclination survey |
| CN110440696A (en) * | 2019-08-06 | 2019-11-12 | 山西省交通新技术发展有限公司 | A kind of side slope deep continuous dislocation monitoring device and method |
| CN110455447A (en) * | 2019-08-09 | 2019-11-15 | 浙江华东工程安全技术有限公司 | The curved bolt stress long term monitoring device in section of jurisdiction and installation method based on fiber grating |
| CN110714489A (en) * | 2019-10-30 | 2020-01-21 | 中国煤炭地质总局勘查研究总院 | Distributed optical fiber sensing monitoring system for horizontal displacement of foundation pit and periphery |
| CN117029756A (en) * | 2023-08-10 | 2023-11-10 | 广东柏正工程检测有限公司 | Slope or foundation pit supporting deformation monitoring system and monitoring method thereof |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105588586A (en) * | 2015-12-11 | 2016-05-18 | 电子科技大学 | Optical fiber distributed sensing system of U-type sensing fiber deployment structure |
| CN105780752A (en) * | 2016-03-24 | 2016-07-20 | 河海大学 | Distributed optical fiber monitoring method for horizontal displacement of support structure of foundation pit |
| CN106096292A (en) * | 2016-06-17 | 2016-11-09 | 中南大学 | Determine main glide direction and the monitoring device of main sliding surface of potential Sliding Slopes and determine method |
| CN106096292B (en) * | 2016-06-17 | 2018-07-13 | 中南大学 | It determines the main glide direction of potential Sliding Slopes and the monitoring device of main sliding surface and determines method |
| CN107131836A (en) * | 2017-06-01 | 2017-09-05 | 中国人民解放军理工大学 | It is a kind of while landslide monitoring sensor and its application of the inside and outside displacement field of measurement |
| CN107620300A (en) * | 2017-09-18 | 2018-01-23 | 中国电建集团华东勘测设计研究院有限公司 | A kind of Foundation Pit bottom resilience quantity monitoring method |
| CN108534730A (en) * | 2018-06-14 | 2018-09-14 | 昆山市建设工程质量检测中心 | A kind of device for measuring soil body deeply mixing cement-soil pile and surface settlement in real time |
| CN108756856A (en) * | 2018-06-21 | 2018-11-06 | 广东赛达交通科技股份有限公司 | A kind of construction method of distribution type fiber-optic drillhole inclination survey |
| CN110440696A (en) * | 2019-08-06 | 2019-11-12 | 山西省交通新技术发展有限公司 | A kind of side slope deep continuous dislocation monitoring device and method |
| CN110455447A (en) * | 2019-08-09 | 2019-11-15 | 浙江华东工程安全技术有限公司 | The curved bolt stress long term monitoring device in section of jurisdiction and installation method based on fiber grating |
| CN110714489A (en) * | 2019-10-30 | 2020-01-21 | 中国煤炭地质总局勘查研究总院 | Distributed optical fiber sensing monitoring system for horizontal displacement of foundation pit and periphery |
| CN117029756A (en) * | 2023-08-10 | 2023-11-10 | 广东柏正工程检测有限公司 | Slope or foundation pit supporting deformation monitoring system and monitoring method thereof |
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Application publication date: 20150401 |