CN115388848A - City subway tunnel surrounding rock strain sensor device based on optical fiber sensing - Google Patents
City subway tunnel surrounding rock strain sensor device based on optical fiber sensing Download PDFInfo
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- CN115388848A CN115388848A CN202210137291.3A CN202210137291A CN115388848A CN 115388848 A CN115388848 A CN 115388848A CN 202210137291 A CN202210137291 A CN 202210137291A CN 115388848 A CN115388848 A CN 115388848A
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- optical fiber
- anchor rod
- strain
- steel anchor
- channel
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 163
- 239000011435 rock Substances 0.000 title claims abstract description 32
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 46
- 239000010959 steel Substances 0.000 claims abstract description 46
- 230000001681 protective effect Effects 0.000 claims abstract description 13
- 239000000945 filler Substances 0.000 claims abstract description 7
- 238000005259 measurement Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 abstract description 12
- 238000004873 anchoring Methods 0.000 abstract description 3
- 238000001514 detection method Methods 0.000 description 6
- 239000000835 fiber Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Optical Transform (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention discloses an urban subway tunnel surrounding rock strain sensor device based on optical fiber sensing, which comprises a steel anchor rod, a first optical fiber for detecting strain and a second optical fiber for detecting temperature, wherein the steel anchor rod is arranged on the steel anchor rod; the steel anchor rod is provided with a strain measuring optical fiber channel which penetrates along the axial direction, and the strain measuring optical fiber channel is filled with filler which seals the first optical fiber in the strain measuring optical fiber channel; the steel anchor rod is also provided with a temperature measuring optical fiber channel which penetrates along the axial direction, and a gap for avoiding the second optical fiber from being pressed is formed between the temperature measuring optical fiber channel and the second optical fiber; the front end of the steel anchor rod is provided with a protective cap for protecting the exposed first optical fiber and the exposed second optical fiber. The anchor rod has the anchoring function, and also has the function of detecting the stress of the anchored rock mass, side slope and other objects; the surrounding rock and slope strain sensor device can be used for remote monitoring and can be used for detecting the full range of point-line-surface combination of the anchored object.
Description
Technical Field
The invention relates to the technical field of strain sensors, in particular to a sensor device for detecting strain of surrounding rocks of urban subway tunnels.
Background
Safety monitoring of subway tunnels is always an important issue of wide concern in the field of domestic and foreign engineering. Because geological conditions are complicated and uneven and are influenced by city construction along the subway tunnel, the subway tunnel is bound to be caused to subside, and in order to ensure the main structure and the operation safety of the subway tunnel, the uneven subsidence of the subway tunnel must be monitored on line.
In the prior art, an anchor rod stress meter is usually adopted for monitoring the stress of surrounding rocks of a subway tunnel, and the basic principle of the anchor rod stress meter is that a strain gauge is used for measuring the strain of an anchor rod after stress is applied, so that the stress of the anchor rod is calculated. The anchor rod stress meter at the present stage can automatically read out the identification information and sequentially store the identification information into a reading instrument, so that the calculation and the query are conveniently and rapidly counted; but the defects are that the monitoring range is small, the long-term stable work in a complex environment is difficult, the remote monitoring and the whole process monitoring are difficult to realize, and the like.
Disclosure of Invention
In view of this, the present invention provides an urban subway tunnel surrounding rock strain sensor device based on optical fiber sensing, so as to solve the technical problem of detecting urban subway tunnel surrounding rocks.
The urban subway tunnel surrounding rock strain sensor device based on optical fiber sensing comprises a steel anchor rod, a first optical fiber for detecting strain and a second optical fiber for detecting temperature;
the steel anchor rod is provided with a strain measuring optical fiber channel which penetrates through the steel anchor rod along the axial direction, and the first optical fiber penetrates into the strain measuring optical fiber channel from the rear end of the steel anchor rod and then penetrates out from the front end of the steel anchor rod through the strain measuring optical fiber channel; the strain measuring optical fiber channel is filled with filler for sealing the first optical fiber in the strain measuring optical fiber channel;
the steel anchor rod is provided with a temperature measuring optical fiber channel which penetrates through the steel anchor rod along the axial direction, the second optical fiber penetrates into the temperature measuring optical fiber channel from the rear end of the steel anchor rod and then penetrates out of the front end of the steel anchor rod through the temperature measuring optical fiber channel, and a gap for preventing the second optical fiber from being pressed is formed between the temperature measuring optical fiber channel and the second optical fiber;
the front end of the steel anchor rod is provided with a protective cap for protecting the exposed first optical fiber and the exposed second optical fiber.
Further, the number of the strain measuring optical fiber channels is even, and the first optical fiber only penetrates into each strain measuring optical fiber channel once.
Further, the steel anchor rod is a hollow anchor rod, and the strain measuring optical fiber channel and the temperature measuring optical fiber channel are arranged on the periphery of the inner hole of the hollow anchor rod.
The temperature measuring optical fiber device further comprises a protective tube fixed in the temperature measuring optical fiber channel, the second optical fiber penetrates through the protective tube, and a gap for avoiding the second optical fiber from being pressed is formed between the protective tube and the second optical fiber.
Further, a first optical fiber coupler is arranged at one end of the first optical fiber, and a second optical fiber coupler is arranged at one end of the second optical fiber.
The invention has the beneficial effects that:
1. according to the urban subway tunnel surrounding rock strain sensor device based on optical fiber sensing, the first optical fiber for detecting strain is arranged in the anchor rod, and the first optical fiber can deform along with the anchor rod after being sealed by the filler, so that the anchor rod not only has an anchoring function, but also has a function of performing stress detection on objects such as an anchored rock body, a side slope and the like; and the anchor rod is also internally provided with a second optical fiber for detecting temperature, and the temperature measuring optical fiber channel can not press the second optical fiber, so that the strain of the steel anchor rod can not influence the temperature data measured by the second optical fiber, and meanwhile, the temperature data measured by the second optical fiber can correct the strain monitoring data of the first optical fiber, so that the part caused by the temperature in the strain of the first optical fiber is eliminated, and the accuracy of the strain monitoring data of surrounding rocks and side slopes can be better ensured.
2. According to the urban subway tunnel surrounding rock strain sensor device based on optical fiber sensing, detection signals of the first optical fiber and the second optical fiber can be transmitted to the signal processing system which is arranged remotely, so that remote monitoring can be carried out, and the convenience in use is improved.
3. According to the invention, a plurality of surrounding rock and slope strain sensor devices can be connected in series through the first optical fiber coupler and the second optical fiber coupler, so that the full-range detection of point-line-surface combination can be formed on an anchored object, and the internal strain condition of the anchored object can be comprehensively mastered; by detecting the obtained strain data, the internal stress condition of the anchored object can be obtained through further stress-strain relation conversion.
Drawings
FIG. 1 is a schematic three-dimensional structure diagram of an urban subway tunnel surrounding rock strain sensor device based on optical fiber sensing;
FIG. 2 is a schematic perspective view of an urban subway tunnel surrounding rock strain sensor device based on optical fiber sensing after a protective cap is removed;
FIG. 3 is a perspective view of a hollow steel bolt;
FIG. 4 is an enlarged view of the portion P in FIG. 2;
fig. 5 is an enlarged view of the portion K in fig. 1.
Detailed Description
The urban subway tunnel surrounding rock strain sensor device based on optical fiber sensing in the embodiment comprises a steel anchor rod 1, a first optical fiber 2 used for detecting strain and a second optical fiber 3 used for detecting temperature.
The steel anchor rod is provided with a strain measuring optical fiber channel 4 which penetrates through the steel anchor rod along the axial direction, and the first optical fiber penetrates into the strain measuring optical fiber channel from the rear end of the steel anchor rod and then penetrates out from the front end of the anchor rod through the strain measuring optical fiber channel; the strain measuring fiber channel is filled with a filler 5 which seals the first optical fiber in the strain measuring fiber channel. In a specific implementation, the filler 5 may be a sealant, a resin, or the like. In this embodiment, the strain measurement optical fiber channels are even-numbered, specifically two, but may also be other even-numbered in different embodiments; the first optical fiber only penetrates into each strain measuring optical fiber channel once, and the strain measuring optical fiber channels are arranged into even number so that the first optical fiber can penetrate through the steel anchor rod more easily.
The steel anchor rod is provided with a temperature measuring optical fiber channel 6 which penetrates through the steel anchor rod along the axial direction, the temperature measuring optical fiber channel 6 is one in the embodiment, and a plurality of temperature measuring optical fiber channels can be arranged in different embodiments; the second optical fiber penetrates into the temperature measuring optical fiber channel from the rear end of the steel anchor rod and then penetrates out of the temperature measuring optical fiber channel from the front end of the steel anchor rod, and a gap for preventing the second optical fiber from being pressed is formed between the temperature measuring optical fiber channel and the second optical fiber.
The front end of steel stock is provided with the helmet 7 that carries out the protection to the first optic fibre that exposes and second optic fibre, and the helmet protects first optic fibre and second optic fibre not damaged when the steel stock anchor goes into objects such as country rock, side slope. The protective cap can be connected to the front end of the steel anchor rod by adopting the existing connection modes such as threaded connection and the like.
In the urban subway tunnel surrounding rock strain sensor device based on optical fiber sensing in the embodiment, the first optical fiber for detecting strain is arranged in the anchor rod, and the first optical fiber can deform along with the anchor rod after being sealed by the filler, so that the anchor rod not only has an anchoring function, but also has a function of performing stress detection on objects such as an anchored rock mass, a side slope and the like; and the anchor rod is also internally provided with a second optical fiber for detecting temperature, and the temperature measuring optical fiber channel can not press the second optical fiber, so that the strain of the steel anchor rod can not influence the temperature data measured by the second optical fiber, and meanwhile, the temperature data measured by the second optical fiber can correct the strain monitoring data of the first optical fiber, so that the part caused by the temperature in the strain of the first optical fiber is eliminated, and the accuracy of the strain monitoring data of surrounding rocks and side slopes can be better ensured.
In the urban subway tunnel surrounding rock strain sensor device based on optical fiber sensing in the embodiment, the detection signals of the first optical fiber and the second optical fiber can be transmitted to the signal processing system arranged remotely, so that remote monitoring can be performed, and the convenience in use is improved.
In the embodiment, the urban subway tunnel surrounding rock strain sensor devices based on optical fiber sensing can be connected in series, and can perform full-range detection of point-line-surface combination on the anchored object, so that the internal strain condition of the anchored object can be comprehensively mastered; by detecting the obtained strain data, the internal stress condition of the anchored object can be obtained through further stress-strain relation conversion.
As an improvement to the above embodiment, the steel anchor rod is a hollow anchor rod, and the strain measuring optical fiber channel and the temperature measuring optical fiber channel are disposed on the periphery of the inner hole of the hollow anchor rod. Of course, in different embodiments, the steel anchor rod may also be a solid anchor rod. The arrangement positions of the strain measuring optical fiber channel and the temperature measuring optical fiber channel on the hollow anchor and the solid anchor can be designed and adjusted according to needs, and the strain measuring optical fiber channel and the temperature measuring optical fiber channel can be arranged on the outer side edge of the anchor rod.
As an improvement to the above embodiment, the urban subway tunnel surrounding rock strain sensor device based on optical fiber sensing further includes a protective tube 8 fixed in the optical fiber channel for measuring temperature, the second optical fiber penetrates through the protective tube, and a gap for preventing the second optical fiber from being pressed is formed between the protective tube and the second optical fiber. The specific protective pipe can be fixed in the temperature measuring optical fiber channel in a bonding mode, the protective pipe can protect the second optical fiber, and the second optical fiber is prevented from being pressed when the steel anchor rod deforms.
As a modification to the above embodiment, one end portion of the first optical fiber is provided with a first optical fiber coupler 9, and one end portion of the second optical fiber is provided with a second optical fiber coupler 10. The first optical fiber coupler and the second optical fiber coupler can be arranged to be connected with the surrounding rock and slope strain sensor device in the embodiment more conveniently in series. Of course, in different embodiments, the optical fiber coupler may not be used, and the surrounding rock and slope strain sensor devices may share the first optical fiber and the second optical fiber which are complete and jointless.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (5)
1. The utility model provides a city subway tunnel country rock strain transducer device based on optical fiber sensing, includes the steel stock, its characterized in that: the optical fiber strain detector further comprises a first optical fiber for detecting strain and a second optical fiber for detecting temperature;
the steel anchor rod is provided with a strain measuring optical fiber channel which penetrates through the steel anchor rod along the axial direction, and the first optical fiber penetrates into the strain measuring optical fiber channel from the rear end of the steel anchor rod and then penetrates out from the front end of the steel anchor rod through the strain measuring optical fiber channel; the strain measuring optical fiber channel is filled with filler for sealing the first optical fiber in the strain measuring optical fiber channel;
the steel anchor rod is provided with a temperature measuring optical fiber channel which penetrates through the steel anchor rod along the axial direction, the second optical fiber penetrates into the temperature measuring optical fiber channel from the rear end of the steel anchor rod and then penetrates out of the front end of the steel anchor rod through the temperature measuring optical fiber channel, and a gap for preventing the second optical fiber from being pressed is formed between the temperature measuring optical fiber channel and the second optical fiber;
the front end of the steel anchor rod is provided with a protective cap for protecting the exposed first optical fiber and the exposed second optical fiber.
2. The urban subway tunnel surrounding rock strain sensor device based on optical fiber sensing as claimed in claim 1, wherein: the strain measurement optical fiber channels are even number, and the first optical fiber only penetrates into each strain measurement optical fiber channel once.
3. The urban subway tunnel surrounding rock strain sensor device based on optical fiber sensing as claimed in claim 1, wherein: the steel anchor rod is a hollow anchor rod, and the strain measuring optical fiber channel and the temperature measuring optical fiber channel are arranged on the periphery of an inner hole of the hollow anchor rod.
4. The urban subway tunnel surrounding rock strain sensor device based on optical fiber sensing as claimed in claim 3, wherein: the temperature measuring optical fiber protection device further comprises a protection tube fixed in the temperature measuring optical fiber channel, the second optical fiber penetrates through the protection tube, and a gap for avoiding the second optical fiber from being pressed is formed between the protection tube and the second optical fiber.
5. The urban subway tunnel surrounding rock strain sensor device based on optical fiber sensing as claimed in claim 1, wherein: and a first optical fiber coupler is arranged at one end part of the first optical fiber, and a second optical fiber coupler is arranged at one end part of the second optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210137291.3A CN115388848A (en) | 2022-02-15 | 2022-02-15 | City subway tunnel surrounding rock strain sensor device based on optical fiber sensing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210137291.3A CN115388848A (en) | 2022-02-15 | 2022-02-15 | City subway tunnel surrounding rock strain sensor device based on optical fiber sensing |
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| CN115388848A true CN115388848A (en) | 2022-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210137291.3A Pending CN115388848A (en) | 2022-02-15 | 2022-02-15 | City subway tunnel surrounding rock strain sensor device based on optical fiber sensing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116429592A (en) * | 2023-06-12 | 2023-07-14 | 中国地质科学院地质力学研究所 | Catastrophe test system and method for simulating activation induced deformation of mixed rock zone of tunnel structure |
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2022
- 2022-02-15 CN CN202210137291.3A patent/CN115388848A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116429592A (en) * | 2023-06-12 | 2023-07-14 | 中国地质科学院地质力学研究所 | Catastrophe test system and method for simulating activation induced deformation of mixed rock zone of tunnel structure |
| CN116429592B (en) * | 2023-06-12 | 2023-08-29 | 中国地质科学院地质力学研究所 | Catastrophe test system and method for simulating activation induced deformation of mixed rock zone of tunnel structure |
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