CN100543498C - Tunnel tunnel face front exploring water inductor - Google Patents
Tunnel tunnel face front exploring water inductor Download PDFInfo
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- CN100543498C CN100543498C CNB200710114063XA CN200710114063A CN100543498C CN 100543498 C CN100543498 C CN 100543498C CN B200710114063X A CNB200710114063X A CN B200710114063XA CN 200710114063 A CN200710114063 A CN 200710114063A CN 100543498 C CN100543498 C CN 100543498C
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- tunnel
- outer tube
- fiber
- face front
- tunnel face
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Abstract
The present invention relates to a kind of tunnel tunnel face front exploring water inductor, comprise outer tube and interior pipe, outer tube is at least a joint, be provided with interior pipe in the first segment outer tube, first segment outer tube one end is provided with end cap, a plurality of fiber-optical grating temperature sensors are laid in the inner tube outer surface cutting in the groove, fiber-optical grating temperature sensor is connected with grating signal demodulation process device.During use, outer tube is stretching, an end of pipe is preceding in the band, insert in the detection hole of accomplishing fluently in the tunnel construction tunnel face, the fiber-optical grating temperature sensor of inner tube outer surface can be sensed temperature variation in the tunnel tunnel face front rock mass, and light signal is passed back in the signal demodulation process device, judges by signal Processing and can determine that front of tunnel heading rock mass humidity changes and distribution, thereby judge water distribution and gushing water situation in the rock mass indirectly, be beneficial to construction period water disaster monitoring.The present invention uses optical fiber sensing technology, and antijamming capability is strong, and the reliability height has advantages such as simple in structure, easy to use, accuracy of judgement.
Description
Technical field
The present invention relates to a kind of induction installation, specifically a kind of tunnel tunnel face front is visited the water induction sensor.
Background technology
We know that the majority of tunnel construction tunnel face front water disaster detection at present is to utilize infrared surface temperature measurement, from the temperature on face rock mass surface, infer humidity, know the situation of the place ahead water indirectly, this technology is surveyed the front of tunnel heading water distribution apart from weak point, low precision is inaccurate.Also have at present by after the face punching and put into the electromagnetism temperature sensor, but since in the rock mass hole environmental baseline poor, traditional sensor reliability, anti-interference, degree of accuracy etc. are difficult to satisfy actual requirement of engineering.
Summary of the invention
The present invention is for overcoming above-mentioned the deficiencies in the prior art, provide a kind of simple in structure, easy to use, investigation depth is far away, reliability is high, tunnel tunnel face front is visited the water induction sensing device accurately.
The objective of the invention is to adopt following technical proposals to realize: a kind of tunnel tunnel face front exploring water inductor, comprise outer tube and interior pipe, described outer tube is at least a joint, be provided with interior pipe in the first segment outer tube, inner and outer pipes is combined closely, material is the good same material of heat transmissibility, first segment outer tube one end is provided with end cap, inner tube outer surface is carved with groove, be laid with a plurality of fiber-optical grating temperature sensors in the groove, but a plurality of fiber-optical grating temperature sensor serial or parallel connection after the outer tube inner fiber draw the back be connected with light signal demodulation process device.
Described outer tube is three joints, and hinged, collapsible between each joint.
Described first segment outer tube one end opening, other end sealing.
Described inner and outer pipes closely cooperates, and material is identical, can be steel pipe or the good tubes of material of thermal conductance effect.
Light signal demodulation process device among the present invention is existing equipment, does not repeat them here.
During use, a plurality of outer tubes are stretching, an end of pipe is preceding in the band, insert in the detection hole of accomplishing fluently in the tunnel construction tunnel face, the fiber-optical grating temperature sensor of inner tube outer surface can be sensed temperature variation in the longer-distance rock mass of tunnel tunnel face front, and light signal passed back in the signal demodulation process device, can determine that by the signal Processing judgement front of tunnel heading rock mass humidity changes and distribution, thereby judge water distribution and gushing water situation in the rock mass indirectly, be beneficial to construction period water disaster monitoring.What of the length of outer tube and joint number can do corresponding adjustment according to actual needs.The present invention uses optical fiber sensing technology, and antijamming capability is strong, and the reliability height has advantages such as simple in structure, easy to use, accuracy of judgement.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is a fiber-optic grating sensor sensing index path of the present invention;
Fig. 3 is the matched curve figure of fiber-optic grating sensor centre wavelength of the present invention and temperature;
1. outer tubes wherein, 2. in pipe, 3. fiber-optical grating temperature sensor, 4. end cap, 5. incident light, 6. reflected light, 7. transmitted light, 8. optical fiber.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
Among Fig. 1, outer tube 1 be hinged with folding three joints, be provided with pipe 2 in the same material (as good materials of heat conduction such as copper or steel) in the first segment outer tube 1, be beneficial to temperature transfer.First segment outer tube 1 right-end openings, opening part is provided with end cap 4.Interior pipe 2 outside surface grooves are provided with a plurality of fiber-optical grating temperature sensors 3, but behind fiber-optical grating temperature sensor 3 serial or parallel connections, optical fiber 8 is drawn the back from the outer tube other end and is connected with light signal demodulation process device.
During use, outer tube 1 is stretching, an end of pipe 2 is preceding in the band, insert in the detection hole of accomplishing fluently in the tunnel construction tunnel face, the fiber-optical grating temperature sensor of interior pipe 2 outside surfaces can be sensed temperature variation in the tunnel tunnel face front rock mass, and light signal is passed back in the signal demodulation process device, judges by signal Processing and can determine that front of tunnel heading rock mass humidity changes and distribution, thereby judge water distribution and gushing water situation in the rock mass indirectly, be beneficial to construction period water disaster monitoring.
The fiber grating of this invention adopts Bragg grating, is a kind of narrowband reflection filtering passive device of excellent performance.When the broadband light wave transmits in Bragg grating, incident light wave will be reflected on correspondent frequency, as Fig. 2, wherein, 5 expression incident lights, 6 expression reflected light, 7 expression transmitted lights.According to optical fiber coupled mode theory, when broadband light is transmitted, can produce Mode Coupling in Bragg grating, satisfy conditioned reflex λ
B=2n
EffThe light of Λ is reflected, wherein n
EffBe effective refractive index, Λ is the grating cycle, λ
BBe the reflection kernel wavelength.
The variation of fiber grating temperature field surrounding is all influential to grating cycle and effective refractive index, and then makes bragg wavelength drift occur.From physical essence, ambient temperature changes and causes that the reason of wavelength-shift mainly contains 3 aspects: the elasto-optical effect that optical fiber thermal expansion effects, optical fiber thermo-optic effect and inside of optical fibre thermal stress cause.Fig. 3 designs the variation of visiting the centre wavelength of water induction fiber-optic grating sensor under different temperatures for this, and the drift linearity of temperature and centre wavelength is good as can be seen.
Claims (3)
1. tunnel tunnel face front exploring water inductor, comprise outer tube and interior pipe, it is characterized in that: described outer tube is three joints, and it is hinged between each joint, be provided with interior pipe in the first segment outer tube, first segment outer tube one end is provided with end cap, is carved with groove on the interior pipe, be laid with a plurality of fiber-optical grating temperature sensors in the groove, a plurality of fiber-optical grating temperature sensor serial or parallel connections after the outer tube inner fiber draw the back be connected with light signal demodulation process device.
2. tunnel tunnel face front exploring water inductor according to claim 1 is characterized in that: described first segment outer tube one end opening, other end sealing.
3. tunnel tunnel face front exploring water inductor according to claim 1 is characterized in that: pipe and outer tube are copper pipe, steel pipe or the good tubes of material of thermal conductance effect in described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710114063XA CN100543498C (en) | 2007-11-14 | 2007-11-14 | Tunnel tunnel face front exploring water inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200710114063XA CN100543498C (en) | 2007-11-14 | 2007-11-14 | Tunnel tunnel face front exploring water inductor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101183155A CN101183155A (en) | 2008-05-21 |
| CN100543498C true CN100543498C (en) | 2009-09-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200710114063XA Expired - Fee Related CN100543498C (en) | 2007-11-14 | 2007-11-14 | Tunnel tunnel face front exploring water inductor |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101586470B (en) * | 2009-07-03 | 2011-01-26 | 中铁一局集团有限公司 | Advanced drilling method for high-pressure water-rich filling cavity |
| CN101625352B (en) * | 2009-08-05 | 2013-08-28 | 山东大学 | Test method of karst water burst when tunneling and monitor device thereof |
| CN103698822B (en) * | 2014-01-07 | 2017-04-12 | 山东大学 | Water-contained structure device for large-sized channel advanced prediction model test and manufacturing method |
| CN104213907B (en) * | 2014-08-22 | 2017-01-11 | 中铁隧道集团有限公司 | Method for detecting temperature of water body in front of tunnel face on basis of temperature field principle |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0238440A1 (en) * | 1986-03-06 | 1987-09-23 | Centre Suisse D'electronique Et De Microtechnique S.A. | Fibre-optic microbend sensor |
| JP2001281071A (en) * | 2000-03-28 | 2001-10-10 | Natl Inst Of Advanced Industrial Science & Technology Meti | Long distance ground thermal physical quantity measuring apparatus |
| CN1329716A (en) * | 1998-12-04 | 2002-01-02 | 塞德拉公司 | Strain-isolated bragg grating temperature sensor |
| WO2004001356A2 (en) * | 2002-06-21 | 2003-12-31 | Sensor Highway Limited | Technique and system for measuring a characteristic in a subterranean well |
| WO2004094961A1 (en) * | 2003-04-23 | 2004-11-04 | Sensor Highway Limited | Fluid flow measurement using optical fibres |
| CN1967177A (en) * | 2005-11-16 | 2007-05-23 | 钟世航 | Method for measuring wave speed of rock mass in front of tunnel face in tunnel |
| CN201096898Y (en) * | 2007-11-14 | 2008-08-06 | 山东大学 | Front water detection induction device for tunnel palm face |
-
2007
- 2007-11-14 CN CNB200710114063XA patent/CN100543498C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0238440A1 (en) * | 1986-03-06 | 1987-09-23 | Centre Suisse D'electronique Et De Microtechnique S.A. | Fibre-optic microbend sensor |
| CN1329716A (en) * | 1998-12-04 | 2002-01-02 | 塞德拉公司 | Strain-isolated bragg grating temperature sensor |
| JP2001281071A (en) * | 2000-03-28 | 2001-10-10 | Natl Inst Of Advanced Industrial Science & Technology Meti | Long distance ground thermal physical quantity measuring apparatus |
| WO2004001356A2 (en) * | 2002-06-21 | 2003-12-31 | Sensor Highway Limited | Technique and system for measuring a characteristic in a subterranean well |
| WO2004094961A1 (en) * | 2003-04-23 | 2004-11-04 | Sensor Highway Limited | Fluid flow measurement using optical fibres |
| CN1967177A (en) * | 2005-11-16 | 2007-05-23 | 钟世航 | Method for measuring wave speed of rock mass in front of tunnel face in tunnel |
| CN201096898Y (en) * | 2007-11-14 | 2008-08-06 | 山东大学 | Front water detection induction device for tunnel palm face |
Non-Patent Citations (4)
| Title |
|---|
| 分布式光纤温度传感器技术在隧道监测中的应用. 蒋奇.应用光学，第26卷第3期. 2005 |
| 分布式光纤温度传感器技术在隧道监测中的应用. 蒋奇.应用光学，第26卷第3期. 2005 * |
| 广州地铁小北站暗挖隧道FBG监测技术研究. 崔天麟等.现代隧道技术，第44卷第4期. 2007 |
| 广州地铁小北站暗挖隧道FBG监测技术研究. 崔天麟等.现代隧道技术，第44卷第4期. 2007 * |
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| CN101183155A (en) | 2008-05-21 |
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