NL2031569A - Processing method for optical fibre monitoring data in a wide range of scour pit at the end of the soft raft for bank-revetment - Google Patents
Processing method for optical fibre monitoring data in a wide range of scour pit at the end of the soft raft for bank-revetment Download PDFInfo
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- NL2031569A NL2031569A NL2031569A NL2031569A NL2031569A NL 2031569 A NL2031569 A NL 2031569A NL 2031569 A NL2031569 A NL 2031569A NL 2031569 A NL2031569 A NL 2031569A NL 2031569 A NL2031569 A NL 2031569A
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- bank
- soft
- soft raft
- mat
- revetment
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 21
- 238000012544 monitoring process Methods 0.000 title claims abstract description 14
- 238000003672 processing method Methods 0.000 title abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000007667 floating Methods 0.000 claims abstract description 11
- 238000004364 calculation method Methods 0.000 claims abstract description 8
- 239000004743 Polypropylene Substances 0.000 claims abstract description 4
- -1 polypropylene Polymers 0.000 claims abstract description 4
- 229920001155 polypropylene Polymers 0.000 claims abstract description 4
- 239000004744 fabric Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims description 3
- 239000000835 fiber Substances 0.000 claims description 2
- 230000002787 reinforcement Effects 0.000 claims 10
- 230000008878 coupling Effects 0.000 claims 1
- 238000010168 coupling process Methods 0.000 claims 1
- 238000005859 coupling reaction Methods 0.000 claims 1
- 230000003628 erosive effect Effects 0.000 claims 1
- 238000005188 flotation Methods 0.000 claims 1
- 238000009991 scouring Methods 0.000 abstract description 25
- 239000002759 woven fabric Substances 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
-
- 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
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0041—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress
- G01M5/005—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress by means of external apparatus, e.g. test benches or portable test systems
- G01M5/0058—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress by means of external apparatus, e.g. test benches or portable test systems of elongated objects, e.g. pipes, masts, towers or railways
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0091—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by using electromagnetic excitation or detection
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
- E02B3/12—Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
- E02B3/122—Flexible prefabricated covering elements, e.g. mats, strips
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/3537—Optical fibre sensor using a particular arrangement of the optical fibre itself
- G01D5/35374—Particular layout of the fiber
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mathematical Physics (AREA)
- Aviation & Aerospace Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Data Mining & Analysis (AREA)
- Theoretical Computer Science (AREA)
- Databases & Information Systems (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mathematical Optimization (AREA)
- Software Systems (AREA)
- General Engineering & Computer Science (AREA)
- Mathematical Analysis (AREA)
- Computational Mathematics (AREA)
- Pure & Applied Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Algebra (AREA)
- Electromagnetism (AREA)
- Revetment (AREA)
Abstract
Disclosed is a processing method for optical fibre monitoring data in a wide range of scour pit at the end of the soft raft for bank-revetment, wherein the calculation formula of the scouring deformation form of the soft raft is as follows: r“ | _ \ :=' r cash -] ‚NEW-.a- —- H . rijpt-"‘ k” H ; flâpf The calculation formula of the final tensile elongation after the deformation of the soft raft is as follows: f' . ï+lpf : .„ :zí l— ;…{ÊHAH {hr—2; . ln the equation, Z is the final floating or sinking depth of the soft raft for bank-revetment; H is the tensile strength of the polypropylene woven fabric of the soft raft in the bit width; x is the scouring pit range (The range value is 0 in the middle of the head of the soft raft for bankrevetment); y is the weight (per unit length) of the raft and the ballast (D-type interlocking block) above it; p is the density of water flow; v is the velocity of water flow; I7 is a dimensionless adjustment parameter. The invention can be used for monitoring in real-time the scouring deformation characteristics of the soft raft for bank-revetment.
Description
Processing method for optical fibre monitoring data in a wide range of scour pit at the end of the soft raft for bank-revetment
TECHNICAL FIELD The invention belongs to the technical field of hydraulic monitoring, and in particular relates to a processing method for optical fibre monitoring data in a wide range of scour pit at the end of the soft raft for bank-revetment.
BACKGROUND At present, the optical fibre sensing technology is widely used in engineering fields, such as tunnels, bridges, the high-speed rail, ports, docks, the housing construction, etc. In the above- mentioned engineering fields, the optical fibre sensor is usually fixed on a rigid structure, the Brillouin frequency shift of the pulse laser in the fibre sensor occurs when the rigid structure is slightly deformed, and the change of the physical property of the monitored object is sensed by utilizing the linear change of the pulse laser frequency shift with the strain. Different from rigid structures, the soft raft for bank-revetment is a flexible structure, The soft raft for bank- revetment often sinks or floats drastically under the water flow scouring. The optical fibre sensor is required to analyse the optical fibre data theoretically according to the deformation characteristics of the flexible structure of the soft raft for bank-revetment. However, at present, there is no processing method for optical fibre monitoring data obtained after the scouring and the settlement, which is suitable for the end of the soft raft for bank-revetment.
SUMMARY in order to solve the technical problems existing in the public knowledge technology, the invention provides a processing method for optical fibre monitoring data in a wide range of scour pit at the end of the soft raft for bank-revetment which is used for monitoring the scouring deformation characteristics of the bank-revetment soft raft in realtime. The technical scheme adopted by the invention for solving the technical problems existing in the prior art is 3s follows: a processing method for optical file monitoring data in a wide range of scour pit at the end of the soft raft for bank-revetment, wherein the calculation formula of the scouring deformation form of the soft raft is as follows: { Lo H UP OH | Zw fe TTE er (1 3k 5 ov poy 5 PV 2 . A 2 The calculation formula of the final tensile siongation after the deformation of the soft raf is as follows:
: Ì í p= ì ov il § =2 a Ln Ea | dx 22 (23 i VL in the sguaton, z is the final floating cr sinking depth of the soft raft for bank-revetment; # is the tensile strength of the polypropylene woven fabric of the soft raft in the bit width; x is the seouring pit range { The range value is 0 in the middle of the head of the soft raft for bank- revetment}; y is the weight {per unit length) of the raft and the ballast (D-type interlocking block) above it pis the density of water Row, vis the velocity of water flow; 17 is a dimensioniess adjustment parameter. The data process steps are as follows: 1} Based on the data actually measured by the optical fibre, calculating the actual elongation of the soft raft for bank-revetment, which is monitored by the optical fibre 2) Assuming an nilial adjustment parameter 7 = fo, the deformation form and scouring depth of the soft raft for bank-revetment are calculated, according to formula (1) and combined with the Heid measured dala; 3} Calculating the theoretical elongation of the soft raft for bank-revelment according to the formula (2); 43 Comparing the actual slongation of the soft raft for bank-revetment monitored by the optical fire with the theoretical elongation of the soft raft for bank-rovetment, and gradually adjusting the parameters n= 1, He, fz until the actual elongation of the soft raft for bank- ravatment monitored by the optical fibre is equal to the theoretical elongation of the soft raft for bank-revetmeant, and determining the final valus of the adjusting parameter n; 5} The final value of the adjustment parameter rj is substituted into the formuda (1) to obtain the final shape and the scouring depth of the soft raft for bank-reveiïment.
The invention has the advantages and positive effects that: based on the optical fibre monitoring data of the large-scale scouring pit at the end of the soft raft for bank-revelment, the deformation shape of the soft raft for bank-revetment is calculated backward; the method considers the influence of the soft raft fabric, the ballast above the soft raft and the hydrodynamic pressure, it's simple, convenient, and easy lo calculate, and can grasp the overal! deformation distribution characteristics of the revetmant soft raft in real-time.
BRIEF DESCRIPTION OF THE FIGURES Fig.1 is the failure mode diagram of the large-scale scouring pit al the end of the soft raft for bhank-reveiment fig. 2 is a graph of the relationship between adjustment parameters and the scour pi depth.
As shown in figures, 1 refers to the riverbed, 2 refers io the initial form of the soft raft fabric, 3 refers to the ballast above the soft raft fabric, and 4 refers to the form of the soft raft after the scouring and the deformation.
DESCRIPTION OF THE INVENTION To further understand the contents, features and advantages of the present invention, tha following examples are illustrated and described in detail with reference to the accompanying drawings: When two failure modes of the large-scale scouring pit and the local scouring pif ocour at the end of the soft raft for bank-revebmant under the action of water current scouring, considering that the soft raft fabric is the flexible knitted structure, no matter the soft raft fabric rolls up cr sinks with the scour pit, ft shows the tensile deformation. So the following assumptions are made for the above two failure modes: (D His assumed that the soft raft fabric is In good connection with the ballast above it {D- type interiocking block), both of them deform synchronously, and the ballast above the arrangement {D-type interlocking block) is distributed uniformby; (2) itis assumed that when the soft raft fabric and the ballast above it (D-type interlocking block) are destroyed by these two modes, the two ends of the scour hole are only inclined al an angle, which is simply supported constraint.
(3) The comprehensive elastic modulus of the soft raft is belwsen the elastic modulus of the concrete of the ballast (B-type ntericcking block} and the elastic modulus of the fabric. Using the simple beam model, the deflection of the simple beam composed of two Kinds of materials is first obtained, and then it is substiluted into the deflection formula of the simple beam In material mechanics, so as to deduce the flexible integrated elastic model E in reverse.
(4) It is assumed that the deformations of the soft raft fabric above the scouring pit and the ballast (D-type interlocking block) above it meet the catenary form, that is, the raft bodies at both ends of the scouring pit are simply supported and fixed, the soft raft droops naturally under the gravity and the hydrodynamic pressure, and the hydrodynamic pressure perpendicular to the arrangement direction can be decomposed Into the horizontal force and the vertical force. it is assumed that the horizontal force is zero {the honzonial component force at any points of the arrangement does not change), and the hydrodynamic pressure is completely converted into the vertical force.
As shown in Fig. 1, when a large-scale scouring oil and a large-scale integral setiiement occurs at the head end of the soft raft for bank-reveiment, the catenary deformation of the row head can be determined from the assumed conditions and the failure mode. The calculation forma for the scouring deformation mode of the soft raft considering the hydrodynamic pressure is as foliows: { i 5) H AV H . 7 = pr Cosh a OD TG ‚a
The calculation formula of the final tensile elongation after the deformation of the soft raft is as follows: TTE § = 2] ie iP | | dx 2 (22 d pO nH y J In the equation, z is the final floating or sinking depth of the soft raft for bank-revetment; H is the tensile strength of the polypropylene woven fabric of the soft raft in the bit width; x is the scouring pit range (The range value is 0 in the middle of the head of the soft raft for bank-revetment); y is the weight {per unit length) of the soft raft and the ballast (D-type interlocking block) above it; p is the density of water flow, v is the water velocity; fn is a dimensionless adjustment parameter.
In the following, the processing method for optical fibre monitoring data in a wide range of scour pit at the end of the. soft raft for bank-revetment with reference to specific engineering fields: The bank-revetment in a waterway adopts the siructure type of the soft raft. The ballast above the soft raft is a D-type interlocking block, The tensile strength of the soft raft polypropyiens woven fabric per unit width is H = 20000 Nim. The weight per unit width of the soft raft fabric, the ballast above the soft raft fabric (D-type interlocking block) and the ballast stones thrown above the soft raft fabric is 10000 N. The water flow velocity is 0.8 m/s and the water body density is 1000 kg/m®.
When a large-scale scouring pit occurs at the ond of the soft raft for bank-revetment, the form after the scouring and the deformation under the water flow can be calouiated by formula {1} and formula {2}: The specific calculation siens are as follows: {1} Based on the dala actually measured by the optical fibre, caloulating the actual elongation of the soft raft for bank-revebment, which is monitored by the optical fibre; {2} Assuming an initial adjustment parameter n = fo, the deformation form and scouring depth of the soft raft for bank-reveiment are calculated, according to formula {1} and combinsd with the field measured data; {2} Caloulating the theoretical elongation of the soft raft for bank-revetmant according to the formuta (2); {4} Comparing the actual slongalion of the soft raft for bank-revetment monitored by the optical fibre with the theorstical elongation of the soft raft for bank-revetment, and gradually adjusting the parameters n= 7, ge, He, urd the actual glongation is equal to the theoretical elongation, and determining the final value of the adjusting parameter n, pleases refer to Fig. 2, {5} The final value of the adjustment parameter n is substituted Into the formula {1} io oblain the final shape and the scouring depth of the soft raft for bank-revetment. The practical application shows that the above-mentioned data processing method has a high degree of 5 agreement with the actual situation, and can be used for monitoring the scouring deformation characteristics of the bank-revetment soft raft in real-time.
Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the specific embodiments described above, which are merely Hlustrative and not restrictive, and those skilled inthe art, in light of the teachings of the present invention, can make many forms without departing from the spirit of the invention and the scope of the claims, which are within the scope of the present invention.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110413489.5A CN113094631B (en) | 2021-04-16 | 2021-04-16 | Large-range scouring pit optical fiber monitoring data processing method for end part of bank protection soft row body |
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| Publication Number | Publication Date |
|---|---|
| NL2031569A true NL2031569A (en) | 2022-10-24 |
| NL2031569B1 NL2031569B1 (en) | 2023-09-15 |
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| NL2031569A NL2031569B1 (en) | 2021-04-16 | 2022-04-13 | Processing method for optical fibre monitoring data in a wide range of scour pit at the end of the soft raft for bank-revetment |
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| CN (1) | CN113094631B (en) |
| NL (1) | NL2031569B1 (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007292530A (en) * | 2006-04-24 | 2007-11-08 | Hokuriku Regional Development Bureau Ministry Land Infrastructure & Transport | Fiber-optic scour detection apparatus and system |
| CN208223412U (en) * | 2018-05-31 | 2018-12-11 | 交通运输部天津水运工程科学研究所 | Soft raft deformation becomes level monitoring system |
| CN110046398A (en) * | 2019-03-22 | 2019-07-23 | 西北农林科技大学 | One kind working as card power station sluice downstream scour process Three-dimensional Numerical Simulation Method |
| CN111322960A (en) * | 2020-04-09 | 2020-06-23 | 水利部交通运输部国家能源局南京水利科学研究院 | Real-time monitoring system and method for deformation of soft water draining platform for channel improvement |
| US20210023605A1 (en) * | 2018-03-28 | 2021-01-28 | Officine Maccaferri S.P.A. | Sensor-fitted metal net |
| WO2021036231A1 (en) * | 2019-08-28 | 2021-03-04 | 水利部交通运输部国家能源局南京水利科学研究院 | Distributed optical fiber-based system and method for real-time monitoring and evaluation of service status of soft mattress |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004047529A1 (en) * | 2004-09-30 | 2006-04-06 | Tutech Innovation Gmbh | Measurement method and apparatus for determining the depth of a forming plug |
| KR100650516B1 (en) * | 2005-02-23 | 2006-11-29 | 주식회사 한길 | Revetment block for preventing evacuation of sediment and construction method thereof |
| CN101824810B (en) * | 2010-04-08 | 2012-06-27 | 重庆交通大学 | Method for protecting river bank by sand-river pile group and flexible mattresses |
| CN103074867B (en) * | 2013-01-28 | 2015-12-23 | 上海市水利工程设计研究院有限公司 | The bridging method of a kind of erosion control river bottom protection soft raft sudden change place |
| US10392764B1 (en) * | 2017-11-21 | 2019-08-27 | Premier Concrete Products, Inc. | Revetment mat |
| CN111636372B (en) * | 2020-07-06 | 2021-09-17 | 长江南京航道工程局 | Construction method for laying interlocking block soft mattress in high-beach shallow water area under low water level |
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2021
- 2021-04-16 CN CN202110413489.5A patent/CN113094631B/en active Active
-
2022
- 2022-04-13 NL NL2031569A patent/NL2031569B1/en active
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| JP2007292530A (en) * | 2006-04-24 | 2007-11-08 | Hokuriku Regional Development Bureau Ministry Land Infrastructure & Transport | Fiber-optic scour detection apparatus and system |
| US20210023605A1 (en) * | 2018-03-28 | 2021-01-28 | Officine Maccaferri S.P.A. | Sensor-fitted metal net |
| CN208223412U (en) * | 2018-05-31 | 2018-12-11 | 交通运输部天津水运工程科学研究所 | Soft raft deformation becomes level monitoring system |
| CN110046398A (en) * | 2019-03-22 | 2019-07-23 | 西北农林科技大学 | One kind working as card power station sluice downstream scour process Three-dimensional Numerical Simulation Method |
| WO2021036231A1 (en) * | 2019-08-28 | 2021-03-04 | 水利部交通运输部国家能源局南京水利科学研究院 | Distributed optical fiber-based system and method for real-time monitoring and evaluation of service status of soft mattress |
| CN111322960A (en) * | 2020-04-09 | 2020-06-23 | 水利部交通运输部国家能源局南京水利科学研究院 | Real-time monitoring system and method for deformation of soft water draining platform for channel improvement |
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| Publication number | Publication date |
|---|---|
| CN113094631B (en) | 2022-03-04 |
| NL2031569B1 (en) | 2023-09-15 |
| CN113094631A (en) | 2021-07-09 |
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