CN103454021B - Tunnel surrounding rock stress monitoring device based on fiber grating sensing - Google Patents
Tunnel surrounding rock stress monitoring device based on fiber grating sensing Download PDFInfo
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- CN103454021B CN103454021B CN201310358451.8A CN201310358451A CN103454021B CN 103454021 B CN103454021 B CN 103454021B CN 201310358451 A CN201310358451 A CN 201310358451A CN 103454021 B CN103454021 B CN 103454021B
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- 238000010223 real-time analysis Methods 0.000 claims description 3
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Abstract
The utility model provides a tunnel country rock stress monitoring devices based on fiber grating sensing, carve the recess with the metal pole along axial direction central symmetry, fixed mounting FBG grating group in the recess, utilize FBG grating group as sensing element, when tunnel country rock warp, the country rock stress will change, make the metal pole produce power, will produce the small deformation in surface, make the grid pitch of the FBG grating of pasting on the metal pole will warp along with it, will lead to the reflection center wavelength of grating to produce the drift, utilize fiber grating demodulator to demodulate wavelength signal for the signal of telecommunication, can obtain the atress condition at different points. The advantages are that: the equipment is simple to install and is suitable for general popularization; the working face end does not need to be powered, so that the field safety is ensured; the influence of electromagnetic interference is effectively avoided by adopting all-optical measurement and optical fiber transmission; the temperature error is compensated, and the precision is improved; the method can timely and accurately provide the surrounding rock stress monitoring result, and is favorable for guiding field production and scientific research work.
Description
Technical field
The present invention relates to a kind of coal mine roadway surrouding rock stress monitoring device, specifically a kind of roadway surrounding rock monitor for stress based on optical fiber grating sensing.
Background technology
In recent years, in all kinds of coal mining accident of China, the accident that country rock disaster causes remains high, also seriously destroy tunnel, destroy transport and ventilating system, along with the continuous increase of coal mining depth, country rock disaster is even more serious, and country rock disaster has become the key factor affecting Safety of Coal Mine Production.For ensureing the stablizing of roadway surrounding rock, preventing country rock accident and affect safety in production, supporting is carried out after generally taking tunnelling immediately in existing colliery, the monitoring of surrouding rock stress is more and more come into one's own, simultaneously also more and more higher to the requirement of the accuracy of monitoring, reliability and on-line monitoring ability.
But the monitoring technology of existing mine working country rock, to having a certain special purpose or device dependence is very strong, belongs to traditional safety monitoring technology means substantially.Although have different advantages as strained chip dynamometry Metallic rod, fluid pressure type Metallic rod dynamometer etc., the problem of most critical is, these monitoring of equipments to data be in fact the force-bearing situation of Metallic rod, but not the actual stress situation of roadway surrounding rock.These equipment also exist various shortcoming simultaneously, and concrete manifestation has: adopt artificial continued observations and collection, and monitoring result is delayed and data error that is that obtain is larger; Survey station breakpoint formula distributes, discontinuous, can not carry out distribution measuring and full-automatic information process-; Be subject to electromagnetism and the interference of down-hole wet environment, reliability is low; Monitoring efficiency is not high, and the sensing element life-span is short; Remote monitoring cannot be carried out to monitoring, real time on-line monitoring and long term monitoring can not be realized.
Summary of the invention
Technical matters: in order to overcome deficiency of the prior art, the invention provides that a kind of precision is high, error is little, antijamming capability is strong, the life-span is long, can carry out long-range real time on-line monitoring and long term monitoring, the roadway surrounding rock monitor for stress based on optical fiber grating sensing of full-automatic information process-data.
Technical scheme: object of the present invention is achieved through the following technical solutions: this roadway surrounding rock monitor for stress comprises: Metallic rod, groove, FBG grating group, optical fiber, optical fiber grating protecting pipe, optical fiber cable for mine, fiber Bragg grating (FBG) demodulator and computer system; Fluted on the shaft of Metallic rod; in groove, have FBG grating group, FBG grating group is connected with optical fiber, and optical fiber grating protecting pipe is arranged on Metallic rod shaft surface; optical fiber is connected with optical fiber cable for mine and leads directly to ground, and optical fiber, fiber Bragg grating (FBG) demodulator and computer system are linked in sequence.
Described FBG grating group at least respectively comprises an axial strain grating, a transverse strain grating and a temperature grating, wherein axial strain grating is only by axial force, namely axially transverse strain grating is only restricted to plane strain state without strain by transverse force, and temperature grating does not stress a temperature influence.
Beneficial effect: owing to have employed such scheme, by Metallic rod Central Symmetry fluting vertically, at groove internal fixtion, FBG grating group is installed, utilize FBG grating group as sensitive element, fiber connector is drawn from afterbody and is connected with optical fiber, access optical fiber cable for mine leads directly to the fiber Bragg grating (FBG) demodulator on ground, when deformation of the surrounding rock in tunnel, surrouding rock stress will change, Metallic rod is made to produce power, surperficial microdeformation will be produced, the pitch of the FBG grating be attached in Metallic rod will be deformed with it, the reflection kernel wavelength of grating will be caused to produce drift, utilize fiber Bragg grating (FBG) demodulator that wavelength signals is demodulated into electric signal, the stressing conditions of difference can be obtained, by computing machine, real-time analysis process and monitoring are carried out to electric signal, and the analysis and processing method of country rock axial stress and transverse stress under temperature compensation condition is drawn according to grating stress characteristic, realize coal mine roadway surrouding rock stress real-time monitoring system, comprehensive understanding roadway surrounding rock stress state, for the stability and security that improve roadway surrounding rock provide foundation, ensure the safety in production in colliery, be beneficial to guide field to produce and research work.
The present invention has the following advantages compared with conventional art:
1, be convenient to realize, equipment is installed simple, long service life, is suitable for popularity application;
2, down-hole does not need power supply, there is not electric signal and electron device, ensure that site safety;
3, adopt full photo measure and Optical Fiber Transmission, effectively can avoid the impact of electromagnetic interference (EMI) under complicated rugged surroundings;
4, temperature error is compensated, improve precision;
5, surrouding rock stress monitoring result can be provided timely and accurately, be beneficial to guide field and produce and research work.
Accompanying drawing explanation
Fig. 1 is that device of the present invention installs and uses schematic diagram;
Fig. 2 is apparatus structure schematic diagram of the present invention;
Fig. 3 is the A-A figure of Fig. 2.
In figure, 1, Metallic rod; 2, groove; 3, FBG grating group; 4, optical fiber; 5, optical fiber grating protecting pipe; 6, optical fiber cable for mine; 7, fiber Bragg grating (FBG) demodulator; 8, computer system; 9, country rock; 10, Anchor Agent; 11, sand-cement slurry.
Embodiment
Below in conjunction with accompanying drawing, one embodiment of the present of invention are further described:
Embodiment 1: this roadway surrounding rock monitor for stress comprises: Metallic rod 1, groove 2, FBG grating group 3, optical fiber 4, optical fiber grating protecting pipe 5, optical fiber cable for mine 6, fiber Bragg grating (FBG) demodulator 7 and computer system 8; On the shaft of Metallic rod 1 fluted 2; FBG grating group 3 is had in groove 2; FBG grating group 3 is connected with optical fiber 4; optical fiber grating protecting pipe 5 is arranged on Metallic rod 1 shaft surface; optical fiber 4 is connected with optical fiber cable for mine 6 and leads directly to ground, and optical fiber 4, fiber Bragg grating (FBG) demodulator 7 and computer system 8 are linked in sequence.
Described device assembly and connection through the following steps: by Metallic rod 1 vertically Central Symmetry carve 4 groups of grooves 2, the position of groove 2 is determined according to the country rock degree of depth that need survey, and is 1-2mm deeply, and width is 2-4mm, length is determined according to pasted grating quantity and grating space, is generally 1-4mm; By the polishing of groove 2 inside surface, dip in acetone or alcohol washes groove with absorbent cotton; With quick-drying gelatin or epoxy resin glue, FBG grating group 3 fixed and evenly cemented in each groove 2, and filling epoxy resin glue, to protect FBG grating group 3; Optical fiber grating protecting pipe 5 is positioned on Metallic rod 1 shaft, FBG grating group 3 is all covered; The fiber connector of FBG grating group 3 is drawn from Metallic rod 1 afterbody, is connected with optical fiber 4; Optical fiber 4 is accessed optical fiber cable for mine 6, and optical fiber cable for mine 6 leads directly to ground and is connected with fiber Bragg grating (FBG) demodulator 7, realizes light signal from down-hole to aboveground transmission; Fiber Bragg grating (FBG) demodulator 7 is connected with computer system 8, is digital signal and transfers to computing machine to process optical signal demodulation.
Described FBG grating group 3 at least respectively comprises an axial strain grating, a transverse strain grating and a temperature grating, wherein axial strain grating is only by axial force, transverse strain grating is only restricted to plane strain state (namely axially without strain) by transverse force, and temperature grating does not stress a temperature influence.
By above concrete enforcement, the invention provides the roadway surrounding rock monitor for stress based on optical fiber grating sensing, by Metallic rod Central Symmetry fluting vertically, at groove internal fixtion, FBG grating group is installed, utilize FBG grating group as sensitive element, fiber connector is drawn from afterbody and is connected with optical fiber, access optical fiber cable for mine leads directly to the fiber Bragg grating (FBG) demodulator on ground, when deformation of the surrounding rock in tunnel, surrouding rock stress will change, Metallic rod is made to produce power, surperficial microdeformation will be produced, the pitch of the FBG grating be attached in Metallic rod will be deformed with it, the reflection kernel wavelength of grating will be caused to produce drift, utilize fiber Bragg grating (FBG) demodulator that wavelength signals is demodulated into electric signal, the stressing conditions of difference can be obtained, by computing machine, real-time analysis process and monitoring are carried out to electric signal, realize coal mine roadway surrouding rock stress Real-Time Monitoring, comprehensive understanding roadway surrounding rock stress state, for the stability and security that improve roadway surrounding rock provide foundation, ensure the safety in production in colliery, be beneficial to guide field to produce and research work.
Claims (1)
1. based on a roadway surrounding rock monitor for stress for optical fiber grating sensing, it is characterized in that: this roadway surrounding rock monitor for stress comprises: Metallic rod, groove, FBG grating group, optical fiber, optical fiber grating protecting pipe, optical fiber cable for mine, fiber Bragg grating (FBG) demodulator and computer system; Fluted on the shaft of Metallic rod, in groove, have FBG grating group, FBG grating group is connected with optical fiber, and optical fiber grating protecting pipe is arranged on Metallic rod shaft surface, optical fiber is connected with optical fiber cable for mine and leads directly to ground, and optical fiber, fiber Bragg grating (FBG) demodulator and computer system are linked in sequence;
Described FBG grating group at least respectively comprises an axial strain grating, a transverse strain grating and a temperature grating, wherein axial strain grating is only by axial force, transverse strain grating is only subject to transverse force and is restricted to plane strain state, namely axially without strain, temperature grating does not stress a temperature influence;
Described Metallic rod vertically Central Symmetry carves 4 groups of grooves, at groove internal fixtion, FBG grating group is installed, utilize FBG grating group as sensitive element, fiber connector is drawn from afterbody and is connected with optical fiber, access optical fiber cable for mine leads directly to the fiber Bragg grating (FBG) demodulator on ground, when deformation of the surrounding rock in tunnel, surrouding rock stress will change, Metallic rod is made to produce power, surperficial microdeformation will be produced, the pitch of the FBG grating be attached in Metallic rod will be deformed with it, the reflection kernel wavelength of grating will be caused to produce drift, utilize fiber Bragg grating (FBG) demodulator that wavelength signals is demodulated into electric signal, obtain the stressing conditions of difference, by computing machine, real-time analysis process and monitoring are carried out to electric signal, realize coal mine roadway surrouding rock stress Real-Time Monitoring.
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| CN201310358451.8A CN103454021B (en) | 2013-08-15 | 2013-08-15 | Tunnel surrounding rock stress monitoring device based on fiber grating sensing |
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| CN102798492A (en) * | 2012-08-30 | 2012-11-28 | 西安科技大学 | Fiber bragg grating detection system device and method for detecting anchoring force of anchor rod |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107328503A (en) * | 2017-07-11 | 2017-11-07 | 中国矿业大学 | Coal mine tunnel top board Stress On-Line system and method based on fiber-optic grating sensor |
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Inventor after: Fang Xinqiu Inventor after: Liang Minfu Inventor after: Xing Xiaopeng Inventor after: Tang Hualin Inventor after: Li Cong Inventor after: He Zhiqiang Inventor after: Liu Xiaoning Inventor before: Fang Xinqiu Inventor before: Liu Xiaoning Inventor before: Liang Minfu |
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