CN112361978A - Rock-soil body deformation monitoring device based on distributed optical fiber - Google Patents
Rock-soil body deformation monitoring device based on distributed optical fiber Download PDFInfo
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- CN112361978A CN112361978A CN202011219372.5A CN202011219372A CN112361978A CN 112361978 A CN112361978 A CN 112361978A CN 202011219372 A CN202011219372 A CN 202011219372A CN 112361978 A CN112361978 A CN 112361978A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 88
- 239000002689 soil Substances 0.000 title claims abstract description 54
- 238000012806 monitoring device Methods 0.000 title claims abstract description 21
- 230000003287 optical effect Effects 0.000 claims abstract description 41
- 238000006073 displacement reaction Methods 0.000 claims abstract description 19
- 239000011435 rock Substances 0.000 claims abstract description 14
- 239000000835 fiber Substances 0.000 claims description 14
- 239000000725 suspension Substances 0.000 claims description 11
- 239000013308 plastic optical fiber Substances 0.000 claims description 10
- 238000012544 monitoring process Methods 0.000 claims description 6
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- 230000035945 sensitivity Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
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- 229920002313 fluoropolymer Polymers 0.000 description 1
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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
- G01B11/18—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge using photoelastic elements
-
- 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
- G01B11/165—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by means of a grating deformed by the object
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
The invention discloses a distributed optical fiber-based rock and soil mass deformation monitoring device, which comprises a distributed optical fiber and an optical fiber information recording component, wherein the distributed optical fiber comprises a counterweight guide head and a sensing optical cable for measuring rock and soil mass displacement; the top end of the counterweight guide head is provided with a U-shaped groove with an upward opening, one end of the sensing optical cable is connected to a first binding post of the optical fiber information recording component, and the other end of the sensing optical cable penetrates through the U-shaped groove and then is connected to a second binding post of the optical fiber information recording component. The rock-soil body deformation monitoring device based on the distributed optical fiber can accurately monitor the deformation condition of the deep rock-soil body.
Description
Technical Field
The invention relates to the technical field of geological exploration, in particular to a rock and soil mass deformation monitoring device based on distributed optical fibers.
Background
More and more infrastructures such as high-speed railways, expressways, high-grade highways and the like need to monitor the deformation condition of deep rock-soil bodies in the process of construction and overhaul so as to improve the quality and service life of the high-speed railways, the expressways and the high-grade highways.
At present, the deformation monitoring method of deep rock-soil mass is mainly carried out by adopting a method of a drilling inclinometer. An inclinometer is an in-situ monitoring instrument for measuring the inclination and azimuth of a borehole.
However, this method has a disadvantage of poor sensitivity. The borehole inclinometer is used for calculating the horizontal displacement of a deep rock-soil body through the inclination angle of an inclinometer pipe in the range of every 1m (or 0.5 m). The accuracy of the measured inclination angle is not very high, and the calculation is also myopia calculation, so that the obtained rock-soil body horizontal displacement is not very accurate.
Disclosure of Invention
In view of this, the embodiments of the present invention are expected to provide a rock-soil mass deformation monitoring device based on a distributed optical fiber, which can accurately monitor the deformation condition of a deep rock-soil mass.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the embodiment of the invention provides a distributed optical fiber-based rock and soil mass deformation monitoring device, which comprises a distributed optical fiber and an optical fiber information recording component, wherein the distributed optical fiber comprises a counterweight guide head and a sensing optical cable for measuring rock and soil mass displacement; the top end of the counterweight guide head is provided with a U-shaped groove with an upward opening, one end of the sensing optical cable is connected to a first binding post of the optical fiber information recording component, and the other end of the sensing optical cable penetrates through the U-shaped groove and then is connected to a second binding post of the optical fiber information recording component.
In the above scheme, the distributed optical fiber further includes a suspension rope suspending the entire distributed optical fiber, and a lower end of the suspension rope is fixed to a top end of the counterweight guiding head.
In the above scheme, the counterweight guiding head is in the shape of an inverted cone, and the U-shaped groove is formed in the bottom end of the cone.
In the above scheme, the sensing optical cable is a polymer optical fiber.
In the above scheme, the device further comprises a self-generating power supply for supplying electric energy to the optical fiber information recording component.
In the above scheme, the self-generating power supply is a solar battery.
In the above scheme, the apparatus further comprises a protection cabinet for accommodating and protecting the optical fiber information recording component.
In the above scheme, the optical fiber information recording component is an optical fiber grating demodulator.
In the above scheme, the apparatus further includes a cloud server, and the cloud server is connected to the fiber bragg grating demodulator.
In the above scheme, the cloud server is connected to the fiber grating demodulator through a narrowband internet of things.
The rock and soil mass deformation monitoring device based on the distributed optical fiber comprises the distributed optical fiber and an optical fiber information recording component, wherein the distributed optical fiber comprises a counterweight guide head and a sensing optical cable for measuring rock and soil mass displacement; the top end of the counterweight guide head is provided with a U-shaped groove with an upward opening, one end of the sensing optical cable is connected to a first binding post of the optical fiber information recording component, and the other end of the sensing optical cable penetrates through the U-shaped groove and then is connected to a second binding post of the optical fiber information recording component. Therefore, the rock-soil body deformation monitoring device based on the distributed optical fiber measures the displacement of the rock-soil body through the sensing optical cable, obtains the deformation condition of the rock-soil body, and can accurately monitor the deformation condition of the deep rock-soil body.
Other beneficial effects of the embodiments of the present invention will be further described in conjunction with the specific technical solutions in the detailed description.
Drawings
FIG. 1 is a schematic diagram of a distributed optical fiber-based rock-soil mass deformation monitoring device according to an embodiment of the invention;
fig. 2 is a schematic diagram of a counterweight guide head in a distributed optical fiber-based rock-soil mass deformation monitoring device according to an embodiment of the invention.
Description of reference numerals:
10 a counterweight guide head; a 110U-shaped slot; 120 fixing bolts; 20 a sensing optical cable; 30 optical fiber information recording means; 310 a first terminal post; 320 a second terminal post; 40 probing the hole; 50 a suspension rope; 60 solar cells; 70 protecting the cabinet; 80, the ground; 90 cement pier.
Detailed Description
Aiming at the technical problems in the prior art, the embodiment of the invention provides a distributed optical fiber-based rock and soil mass deformation monitoring device, which comprises a distributed optical fiber and an optical fiber information recording component, wherein the distributed optical fiber comprises a counterweight guide head and a sensing optical cable for measuring the displacement of the rock and soil mass; the top end of the counterweight guide head is provided with a U-shaped groove with an upward opening, one end of the sensing optical cable is connected to a first binding post of the optical fiber information recording component, and the other end of the sensing optical cable penetrates through the U-shaped groove and then is connected to a second binding post of the optical fiber information recording component.
The sensing optical cable includes sensing optical fiber, which is optical fiber to convert the physical quantity of non-optical signal into optical signal, to be sensed and transmitted by the optical fiber and converted into the measured physical quantity for measuring the physical quantity, such as temperature, pressure, displacement, speed, voltage, current, melt concentration, etc. and is also called optical fiber sensor.
One end of the sensing optical cable is connected to a first binding post of the optical fiber information recording component, and the other end of the sensing optical cable is connected to a second binding post of the optical fiber information recording component, so that the sensing optical cable forms a loop, the light source emits light waves from the first binding post, the light waves pass through an optical fiber light path and superpose external information such as deformation on carrier light waves, modulated light waves bearing information are transmitted to the information recording component through the second binding post, and deep displacement of the rock and soil mass to be detected is detected after signal processing.
The sensing optical cable in the embodiment of the invention is used for measuring the displacement of the rock-soil body, can acquire the deformation conditions of the rock-soil body, including horizontal deformation and vertical deformation (settlement), and overcomes the defect that a drilling inclinometer can only measure the horizontal displacement of the rock-soil body but not the vertical displacement of the rock-soil body.
The distributed optical fiber is provided with the counterweight guide head, so that the sensing optical cable can be conveniently arranged underground at any depth.
The top end of the counterweight guide head is provided with a U-shaped groove with an upward opening, so that when the other end of the sensing optical cable returns to the second binding post of the optical fiber information recording component, the optical fiber is not damaged due to right-angle bending.
According to the rock-soil mass deformation monitoring device based on the distributed optical fiber, disclosed by the embodiment of the invention, the displacement of the rock-soil mass is measured through the sensing optical cable, the deformation condition of the rock-soil mass is obtained, and the deformation condition of the deep rock-soil mass can be accurately monitored.
In other embodiments of the present invention, the distributed optical fiber further includes a suspension rope suspending the entire distributed optical fiber, and a lower end of the suspension rope is fixed to a top end of the counterweight guide head. Therefore, the weight of the counterweight guide head and the weight of the sensing optical cable are borne by the suspension rope, and the sensing optical cable is not stressed and is not easy to damage.
In other embodiments of the present invention, the weighted guide head is in the shape of an inverted cone, and the U-shaped slot is disposed at the bottom end of the cone. The inverted cone is a better embodiment to facilitate deep underground.
In other embodiments of the present invention, the sensing cable is a polymer optical fiber. A Polymer Optical Fiber (POF) is a special Optical Fiber made of polymer. Many optical polymers are used to fabricate polymer optical fibers, including Polymethylmethacrylate (PMMA), amorphous fluorinated polymers (CYTOP), Polystyrene (PS), and Polycarbonate (PC). For some sensing applications, polymer optical fibers have significant advantages, including high elastic strain limit, high fracture toughness, high bending flexibility, and high strain sensitivity. It should be noted that the major advantage of the monitoring and control research on reinforced thermoplastic tubes is the high elastic strain limit (10-15%), compared to 6% for conventional small diameter silicon optical fibers. The unique mechanical properties of polymer fiber optic sensors have led to their use in harsh civil environments. Due to the many advantages of polymer optical fibers, it is a preferred embodiment to use them here.
In other embodiments of the present invention, the apparatus further comprises a self-generating power supply for supplying power to the optical fiber information recording component. Therefore, the power supply is not needed through the mains supply, the device is suitable for any place and convenient to move, and the device is a better implementation mode.
In other embodiments of the present invention, the self-generating power source is a solar cell. The solar cell does not need energy consumption for electric energy generation, is more environment-friendly and is more convenient to use.
In other embodiments of the present invention, the apparatus further comprises a protective cabinet that houses and protects the fiber optic information recording component. Thus, the optical fiber information recording member can be protected more effectively, and a more preferable embodiment is obtained.
In other embodiments of the present invention, the fiber optic information recording component is a fiber grating demodulator. The fiber grating demodulator can acquire information of the sensing optical cable, namely displacement information of the rock-soil body more quickly, and acquire deformation information of the rock-soil body according to the displacement information, so that the fiber grating demodulator is a better implementation mode.
In other embodiments of the present invention, the apparatus further includes a cloud server, and the cloud server is connected to the fiber grating demodulator. Therefore, the deformation information of the rock-soil mass can be uploaded to the cloud server for further analysis and research, and the method is a better implementation mode.
In other embodiments of the present invention, the cloud server is connected to the FBG demodulator through a narrowband Internet of Things (NB-IoT). NB-IoT is an emerging technology in the IoT field, supports cellular data connectivity for Low-Power devices over Wide Area networks, and is also called Low-Power Wide-Area Network (LPWAN). NB-IoT supports efficient connectivity for devices with long standby time and high requirements for network connectivity. NB-IoT device battery life is said to be improved by at least 10 years while still providing very comprehensive indoor cellular data connection coverage. NB-IoT has become an important branch of the world wide internetwork. The NB-IoT is constructed in a cellular network, consumes only about 180kHz bandwidth, and can be directly deployed in a gsm (global System for Mobile communications) network, a umts (universal Mobile communications System) network, or an lte (long Term evolution) network, so as to reduce the deployment cost and achieve smooth upgrade. By NB-IoT, power consumption can be reduced, i.e., cost can be reduced, which is a better implementation.
For a more clear understanding of the present invention, reference is now made to the following detailed description taken in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Also, the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from these embodiments without inventive step, are within the scope of protection of the present invention.
Examples
The embodiment provides a distributed optical fiber-based rock and soil mass deformation monitoring device, as shown in fig. 1, the device comprises a distributed optical fiber and an optical fiber information recording component 30, wherein the distributed optical fiber comprises a counterweight guide head 10 and a sensing optical cable 20; the top end of the counterweight guide head is provided with a U-shaped groove 110 with an upward opening, one end of the sensing optical cable 20 is connected to the first binding post 310 of the optical fiber information recording component 30, and the other end of the sensing optical cable passes through the U-shaped groove and then is connected to the second binding post 320 of the optical fiber information recording component 30.
The sensing optical cable 20 is used for measuring the displacement of the underground rock-soil body with the preset depth, and further acquiring the deformation conditions including horizontal deformation and vertical deformation (settlement). In the figure, the sensing cable 20 is located in a detection bore 40.
Here, the detection hole is a deep hole excavated or drilled to measure deformation of the rock-soil body, and is backfilled after the sensing optical cable 20 and the weight guide head 10 are laid to a designed depth. The backfilled soil is generally mixed by quartz sand and clay according to a certain proportion, and the mixing comparison is determined according to the original soil components or viscosity.
In addition, after the sensor cable 20 is laid, it is necessary to detect whether the sensor cable 20 is in a passage, for example, one end of the sensor cable 20 may be irradiated with a red light pen, and the other end may be observed with naked eyes to see whether red light is emitted, which is not described in detail.
The counterweight guide head is used for guiding the sensing optical cable 20 to reach the underground with a preset depth, and the counterweight guide head can more conveniently reach the underground depth due to the weight of the counterweight guide head.
The optical fiber information recording component 30 is used for recording the displacement of the rock-soil mass measured by the sensing optical cable 20 and obtaining the deformation condition of the rock-soil mass according to the displacement.
In this embodiment, the distributed optical fiber further includes a suspension rope 50 suspending the entire distributed optical fiber, and a lower end of the suspension rope 50 is fixed to a top end of the counterweight guiding head 10. Specifically, the suspension rope 50 is a steel wire rope, and the strength of the steel wire rope is better.
In this embodiment, the counterweight guiding head 10 is in the shape of an inverted cone, and the U-shaped groove is disposed at the bottom end of the cone. The inverted cone is more convenient to go deep into the ground.
Specifically, as shown in fig. 2, a wire rope fixing pin 120 is fixed to the top center of the counterweight guide head 10. The fixing bolt 120 may be a bolt, and the counterweight guide head 10 is provided with a threaded hole matched with the bolt.
In this embodiment, the sensing optical cable 20 is a polymer optical fiber. The polymer optical fiber has the advantages of high elastic strain limit, high fracture toughness, high bending flexibility, high strain sensitivity and the like, and is applied to severe civil environments.
In this embodiment, the apparatus further includes a self-generating power supply that supplies electric power to the optical fiber information recording part 30. Specifically, the self-generating power source is a solar cell 60.
In this embodiment, the apparatus further includes a protective cabinet 70 that houses and protects the fiber optic information recording component 30. Specifically, the protection cabinet 70 is fixed to the ground 80, more specifically, the ground 80 is cast with a cement pier 90, and the protection cabinet 70 is fixed to the cement pier 90.
In this embodiment, the optical fiber information recording component 30 is an optical fiber grating demodulator.
In this embodiment, the apparatus further includes a cloud server (not shown in the figure), and the cloud server is connected to the fiber grating demodulator.
In this embodiment, the cloud server is connected to the fiber bragg grating demodulator through an NB-IoT.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In the description of the embodiments of the present invention, unless otherwise specified and limited, the term "connected" should be understood broadly, and for example, the term may be connected electrically, or may be connected between two elements, directly or indirectly through an intermediate medium, and the specific meaning of the term may be understood by those skilled in the art according to specific situations.
In the embodiments of the present invention, if the terms "first \ second \ third" are used, similar objects are distinguished only, and a specific ordering for the objects is not represented, it should be understood that "first \ second \ third" may be interchanged with a specific order or sequence as the case may be.
It should be appreciated that reference throughout this specification to "one embodiment" or "some embodiments" means that a particular feature, structure or characteristic described in connection with the embodiments is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in some embodiments" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
It should be understood that, in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention. The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.
Claims (10)
1. A distributed optical fiber-based rock and soil mass deformation monitoring device is characterized by comprising a distributed optical fiber and an optical fiber information recording component, wherein the distributed optical fiber comprises a counterweight guide head and a sensing optical cable for measuring rock and soil mass displacement; the top end of the counterweight guide head is provided with a U-shaped groove with an upward opening, one end of the sensing optical cable is connected to a first binding post of the optical fiber information recording component, and the other end of the sensing optical cable penetrates through the U-shaped groove and then is connected to a second binding post of the optical fiber information recording component.
2. The distributed optical fiber-based rock-soil mass deformation monitoring device according to claim 1, wherein the distributed optical fiber further comprises a suspension rope suspending the entire distributed optical fiber, and a lower end of the suspension rope is fixed to a top end of the counterweight guide head.
3. The distributed optical fiber-based rock-soil mass deformation monitoring device according to claim 1 or 2, wherein the counterweight guide head is shaped as an inverted cone, and the U-shaped groove is formed at the bottom end of the cone.
4. The distributed optical fiber based rock-soil mass deformation monitoring device according to claim 1 or 2, wherein the sensing optical cable is a polymer optical fiber.
5. The apparatus for monitoring deformation of rock-soil mass based on distributed optical fiber according to claim 1 or 2, further comprising a self-generating power source for supplying electric power to the optical fiber information recording part.
6. The device for monitoring deformation of rock and soil mass based on distributed optical fiber according to claim 5, wherein the self-generating power source is a solar cell.
7. The distributed optical fiber based geotechnical body deformation monitoring apparatus according to claim 1 or 2, wherein said apparatus further includes a protection cabinet for housing and protecting said optical fiber information recording member.
8. The distributed optical fiber-based rock-soil mass deformation monitoring device according to claim 1 or 2, wherein the optical fiber information recording component is a fiber grating demodulator.
9. The distributed optical fiber based rock-soil mass deformation monitoring device according to claim 8, further comprising the cloud server, wherein the cloud server is connected with the fiber grating demodulator.
10. The distributed optical fiber-based rock-soil mass deformation monitoring device according to claim 9, wherein the cloud server is connected with the fiber bragg grating demodulator through a narrowband internet of things.
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| CN202011219372.5A CN112361978A (en) | 2020-11-04 | 2020-11-04 | Rock-soil body deformation monitoring device based on distributed optical fiber |
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| CN202011219372.5A CN112361978A (en) | 2020-11-04 | 2020-11-04 | Rock-soil body deformation monitoring device based on distributed optical fiber |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024093629A1 (en) * | 2023-06-13 | 2024-05-10 | 中国地质调查局南京地质调查中心(华东地质科技创新中心) | Optical fiber layout device and method for borehole measurement |
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| CN103438820A (en) * | 2013-09-05 | 2013-12-11 | 南京大学 | Borehole profile rock and soil mass layered deformation optical fiber measuring method |
| CN110608678A (en) * | 2019-11-05 | 2019-12-24 | 东华理工大学 | Deep horizontal displacement monitoring device based on Brillouin scattering optical fiber |
| CN213956272U (en) * | 2020-11-04 | 2021-08-13 | 中铁第四勘察设计院集团有限公司 | Rock-soil body deformation monitoring device based on distributed optical fiber |
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2020
- 2020-11-04 CN CN202011219372.5A patent/CN112361978A/en active Pending
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| CN103438820A (en) * | 2013-09-05 | 2013-12-11 | 南京大学 | Borehole profile rock and soil mass layered deformation optical fiber measuring method |
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