CN113094631B - Large-range scouring pit optical fiber monitoring data processing method for end part of bank protection soft row body - Google Patents
Large-range scouring pit optical fiber monitoring data processing method for end part of bank protection soft row body Download PDFInfo
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- CN113094631B CN113094631B CN202110413489.5A CN202110413489A CN113094631B CN 113094631 B CN113094631 B CN 113094631B CN 202110413489 A CN202110413489 A CN 202110413489A CN 113094631 B CN113094631 B CN 113094631B
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- 238000009991 scouring Methods 0.000 title claims abstract description 25
- 239000013307 optical fiber Substances 0.000 title claims abstract description 24
- 238000012544 monitoring process Methods 0.000 title claims abstract description 20
- 238000003672 processing method Methods 0.000 title claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000004364 calculation method Methods 0.000 claims abstract description 8
- 239000004743 Polypropylene Substances 0.000 claims abstract description 6
- 239000004744 fabric Substances 0.000 claims abstract description 6
- -1 polypropylene Polymers 0.000 claims abstract description 6
- 229920001155 polypropylene Polymers 0.000 claims abstract description 6
- 230000003628 erosive effect Effects 0.000 claims abstract description 4
- 238000007667 floating Methods 0.000 claims abstract description 4
- 238000005259 measurement Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 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
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
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- 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
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- 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
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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
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- 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
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- 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
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- 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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- Electromagnetism (AREA)
- Revetment (AREA)
Abstract
The invention discloses a processing method of large-range scouring pit optical fiber monitoring data at the end part of a bank protection soft raft, wherein the calculation formula of the scouring deformation form of the soft raft is as follows:
the final stretching elongation after the soft mattress is deformed is as follows:
in the formula, z is the final floating or sinking depth of the bank protection soft raft; h is the tensile strength of the soft polypropylene knitted cloth in the position width; x is the range of the scour pit (the middle of the bank protection soft row head is 0); gamma is the weight of the soft raft and the ballast (D-shaped interlocking block) above the soft raft in unit length; rho is the water flow density; v is the water flow velocity; eta is a dimensionless adjustment parameter. The invention can be used for monitoring the erosion deformation characteristic of the bank protection soft row in real time.
Description
Technical Field
The invention belongs to the technical field of hydraulic monitoring, and particularly relates to a processing method of optical fiber monitoring data of a large-range washout pit at the end part of a bank protection soft raft.
Background
At present, the optical fiber sensing technology is widely applied to the engineering field, such as tunnels, bridges, high-speed rails, ports, wharfs, house buildings and the like. In the above-described construction, the optical fiber sensor is usually fixed to a rigid structure, and changes in physical properties of the object are sensed by causing brillouin shift change in the pulse laser in the optical fiber sensor when the rigid structure is slightly deformed, and using a relationship in which the amount of change in the shift of the pulse laser linearly changes with strain. Different from a rigid structure, the bank protection soft row belongs to a flexible structure, the bank protection soft row is often greatly settled or floated under the action of water flow scouring, and when the optical fiber sensor is adopted for monitoring, theoretical analysis is needed to be carried out on optical fiber data according to the deformation characteristic of the flexible structure of the bank protection soft row. However, at the present stage, a processing method for monitoring data by using a fiber scour settlement suitable for the end part of the bank protection soft row head with pertinence does not exist.
Disclosure of Invention
The invention provides a processing method of optical fiber monitoring data of a large-scale washout pit at the end part of a bank protection soft raft body, which is used for monitoring the washout deformation characteristic of the bank protection soft raft body in real time.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows: a processing method for monitoring data of a large-range scouring pit optical fiber at the end part of a bank protection soft raft, wherein the calculation formula of the scouring deformation form of the soft raft is as follows:
the final stretching elongation after the soft mattress is deformed has the following calculation formula:
in the formula, z is the final floating or sinking depth of the bank protection soft raft; h is the tensile strength of the soft polypropylene knitted cloth in the position width; x is the range of the scour pit (the middle of the bank protection soft row head is 0); gamma is the weight of the soft raft and the ballast (D-shaped interlocking block) above the soft raft in unit length; rho is the water flow density; v is the water flow velocity; eta is a dimensionless adjustment parameter; the data processing steps are as follows:
1) calculating the actual elongation of the shore protection software row monitoring optical fiber according to the actual measurement data integral of the optical fiber;
2) assuming an initial tuning parameter η ═ η0According to the formula (1) and combining field measurementCalculating the deformation form and the scouring depth of the bank protection software row by data;
3) calculating the theoretical elongation of the bank protection soft row according to a formula (2);
4) comparing the actual elongation of the shore protection soft row monitoring optical fiber with the theoretical elongation of the shore protection soft row, and gradually adjusting the parameter eta ═ eta1,η2,η3…, until the actual elongation of the shore protection soft row monitoring optical fiber is equal to the theoretical elongation of the shore protection soft row, and determining the final value of the adjustment parameter eta;
5) and substituting the final value of the adjustment parameter eta into a formula (1) to obtain the final form and the scouring depth of the bank protection soft row.
The invention has the advantages and positive effects that: the method takes the influence of the software row arrangement and the ballast above the software row arrangement and the hydrodynamic pressure into consideration, has the characteristics of simplicity, convenience and easy calculation, and can master the deformation distribution characteristics of the whole bank protection software row in real time.
Drawings
FIG. 1 is a diagram showing a large-scale erosion pit damage mode appearing at the end part of a bank protection soft raft;
FIG. 2 is a graph of the relationship between the tuning parameters and the depth of the flush pits.
In the figure: 1 is a riverbed, 2 is an initial configuration of bank protection soft row arrangement, 3 is ballast above the soft row arrangement, and 4 is a configuration of the soft row after scouring deformation.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
when two damage modes of large-range scouring pits and local scouring pits appear at the head end part of the bank protection soft row under the water flow scouring action, the flexible knitted structure is considered to be arranged in the bank protection soft row, and the arrangement is stretched and deformed no matter the soft row is arranged to be turned upwards or sink along with the scouring pits, so that the following assumptions are made for the two damage modes:
firstly, assuming that the soft row arrangement and the ballast (D-shaped interlocking block) above the soft row arrangement are in good connection state, the soft row arrangement and the ballast (D-shaped interlocking block) above the soft row arrangement are synchronously deformed, and the ballast (D-shaped interlocking block) above the soft row arrangement is uniformly distributed;
secondly, assuming that the arrangement of the soft rows and the ballast (D-shaped interlocking block) above the soft rows are damaged in the two modes, the rows at the two ends of the scouring pit are only inclined at an angle, namely the simple support constraint;
thirdly, the comprehensive elastic modulus of the soft mattress is between the elastic modulus of the ballast (D-shaped interlocking block) concrete and the elastic modulus of the arrangement, a simple beam model is adopted, the deflection of a simple beam consisting of 2 materials is firstly solved, and then the deflection formula of the simple beam in material mechanics is substituted, and the comprehensive elastic modulus E of the soft mattress is reversely pushed out;
and fourthly, assuming that the soft raft above the scouring pit is arranged and the ballast (the D-shaped interlocking block) above the scouring pit is deformed to meet the catenary form, namely the rows at two ends of the scouring pit are simply supported and fixed, the soft raft naturally droops under the action of gravity and hydrodynamic pressure, the hydrodynamic pressure vertical to the arrangement direction can be decomposed into horizontal force and vertical force, and assuming that the horizontal force is zero (the horizontal component force of any point of arrangement is not changed), the hydrodynamic pressure is completely converted into the vertical force.
Referring to fig. 1, when a large-scale washout pit occurs at the end of a bank protection soft row head and a large-scale integral settlement occurs at the end of the row head, the catenary deformation of the row head can be determined according to assumed conditions and damage forms, and the calculation formula of the soft row washout deformation form finally considering the hydrodynamic pressure is as follows:
the final stretching elongation after the soft mattress is deformed is as follows:
in the formula, z is the final floating or sinking depth of the bank protection soft raft;
h is the tensile strength of the soft polypropylene knitted cloth in the position width;
x is the range of the scour pit (the middle of the bank protection soft row head is 0);
gamma is the weight of the soft raft and the ballast (D-shaped interlocking block) above the soft raft in unit length;
rho is the water flow density;
v is the water flow velocity;
eta is a dimensionless adjustment parameter.
The method for processing the optical fiber monitoring data of the large-scale scour pits at the end part of the bank protection soft raft is described by combining specific engineering:
the revetment of a certain channel adopts a soft row structure, the ballast above the revetment is a D-shaped interlocking block, the tensile strength of the soft row polypropylene woven cloth in unit width is H26000N/m, the weight of the soft row arrangement and the ballast above the soft row polypropylene woven cloth in unit width (D-shaped interlocking block) and ballast block stones thrown above the soft row arrangement is 10000N, the water flow speed is 0.8m/s, and the water density is 1000kg/m3。
When a large-range scouring pit appears at the end part of the bank protection soft raft body, the scouring deformation form of the bank protection soft raft body under water flow can be obtained by calculation according to a formula (1) and a formula (2):
the specific calculation steps are as follows:
(1) calculating according to the actual measurement data integral of the optical fiber to obtain the actual elongation of the optical fiber of the bank protection software row;
(2) assuming an initial tuning parameter η ═ η0Calculating the deformation form and the scouring depth of the bank protection software row according to the formula (1) and combining with the field measured data;
(3) calculating to obtain the theoretical elongation of the bank protection soft row according to a formula (2);
(4) comparing the actual elongation with the theoretical elongation of the optical fiber of the bank protection soft row and gradually adjusting the parameter eta1,η2,η3… until the actual elongation equals the theoretical elongation and determining the final value of the adjustment parameter η, see fig. 2;
(5) and (3) substituting the determined adjustment parameter eta into a formula (1) to obtain the final form and the scouring depth of the bank protection soft row.
The practical application shows that: the data processing method has higher goodness of fit with the actual situation, and can be used for monitoring the erosion deformation characteristic of the bank protection software row 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 above-described embodiments, which are merely illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (1)
1. A processing method of optical fiber monitoring data of a large-scale erosion pit at the end part of a bank protection soft raft body is characterized in that,
the calculation formula of the scouring deformation form of the soft mattress is as follows:
the final stretching elongation after the soft mattress is deformed is as follows:
in the formula, z is the final floating or sinking depth of the bank protection soft raft;
h is the tensile strength of the soft polypropylene knitted cloth in the position width;
x is the range of the scour pit (the middle of the bank protection soft row head is 0);
gamma is the weight of the soft raft and the ballast (D-shaped interlocking block) above the soft raft in unit length;
rho is the water flow density;
v is the water flow velocity;
eta is a dimensionless adjustment parameter;
the data processing steps are as follows:
1) calculating the actual elongation of the shore protection software row monitoring optical fiber according to the actual measurement data integral of the optical fiber;
2) assuming an initial tuning parameter η ═ η0Calculating the deformation form and the scouring depth of the bank protection software row according to the formula (1) and by combining with the field measured data;
3) calculating the theoretical elongation of the bank protection soft row according to a formula (2);
4) comparing the actual elongation of the shore protection soft row monitoring optical fiber with the theoretical elongation of the shore protection soft row, and gradually adjusting the parameter eta ═ eta1,η2,η3…, until the actual elongation of the shore protection soft row monitoring optical fiber is equal to the theoretical elongation of the shore protection soft row, and determining the final value of the adjustment parameter eta;
5) and substituting the final value of the adjustment parameter eta into a formula (1) to obtain the final form and the scouring depth of the bank protection soft row.
Priority Applications (2)
| 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 |
| 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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| 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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| CN113094631A CN113094631A (en) | 2021-07-09 |
| CN113094631B true CN113094631B (en) | 2022-03-04 |
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| NL2031569A (en) | 2022-10-24 |
| CN113094631A (en) | 2021-07-09 |
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