CN115127513A - Long-distance pavement structure settlement monitoring method combining distributed optical fiber sensing technology and parameter inversion analysis - Google Patents
Long-distance pavement structure settlement monitoring method combining distributed optical fiber sensing technology and parameter inversion analysis Download PDFInfo
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- CN115127513A CN115127513A CN202210796058.6A CN202210796058A CN115127513A CN 115127513 A CN115127513 A CN 115127513A CN 202210796058 A CN202210796058 A CN 202210796058A CN 115127513 A CN115127513 A CN 115127513A
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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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/01—Devices or auxiliary means for setting-out or checking the configuration of new surfacing, e.g. templates, screed or reference line supports; Applications of apparatus for measuring, indicating, or recording the surface configuration of existing surfacing, e.g. profilographs
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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
- 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
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- 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
Abstract
The invention provides a long-distance pavement structure settlement monitoring method combining a distributed optical fiber sensing technology and parameter inversion analysis, and belongs to the technical field of intelligent structure health monitoring. Respectively designing a rigid or flexible packaging distributed optical fiber sensing device matched with the cooperative deformation of the rigid or flexible packaging distributed optical fiber sensing device according to the rigid or flexible characteristics of each layer of the structure of the road surface, and realizing the temperature self-compensation of a single sensing device in a mode of embedding a free distributed optical fiber in a packaging layer; arranging the designed packaged distributed optical fibers in each layer of the pavement in a planar grid mode along the criss-cross mode to construct an optical fiber sensing network monitoring system; the local deflection deformation of the road surface is sensed through monitoring information of an embedded optical fiber sensing network, the staged sedimentation parameter inversion is realized by combining an elastic foundation beam theory and a mathematical analysis method, and meanwhile, the continuous monitoring of the sedimentation in the full-scale range is realized by assisting a curved surface reconstruction algorithm. The device and the analysis method provided by the invention provide a method with high measurement stability and accuracy for pavement settlement monitoring.
Description
Technical Field
The invention belongs to the field of intelligent health monitoring and detection of structures, and relates to an optical fiber sensing test method for long-distance pavement structure settlement monitoring.
Background
Roads are important components of infrastructure, however, road surface settlement is a potential risk affecting driving safety. There are many factors that cause road surface settlement, such as construction quality, traffic load, natural environment, etc. Pavement settlement can be divided into uniform settlement and non-uniform settlement, and the harm degree of the non-uniform settlement is larger under the common condition. Road settlement is mainly manifested by unevenness or cracking of the road surface, resulting in a reduction in the ride comfort. Therefore, the method has important engineering significance for monitoring the settlement condition of the long-distance pavement structure by adopting an effective means, carrying out long-term tracking monitoring on pavement deformation information, accurately evaluating the service performance of the pavement and guiding the formulation of pavement maintenance strategies.
Currently, roadbed settlement monitoring technologies include a settlement plate method, a settlement cup method, an electromagnetic layered settlement meter method, a hydraulic profile settlement meter method, a horizontal inclinometer method and the like. Most of the traditional roadbed settlement monitoring instruments are point-type monitoring, and have the defects of missing detection, large measurement error, low automation level, large workload and the like. The optical fiber sensing testing technology is applied to long-distance pavement structure deformation monitoring in consideration of the remarkable advantages of high sensitivity, corrosion resistance, electromagnetic interference resistance, absolute measurement, small volume, light weight, easiness in integration of a network, large testing scale and the like.
At present, scholars monitor the settlement of a road base surface relative to a CFG (Cement flash-ash grade) pile or an original soil foundation through a fiber grating type displacement sensor; the subgrade settlement condition is reflected through a zigzag arrangement form of the sensing optical fibers and a three-dimensional 3-time spline interpolation method of MATLAB language; measuring the settlement of the roadbed through the bending sensing characteristic of an MZ (Mach-Zehnder) type double-core optical fiber sensor, and realizing the monitoring of the settlement of the roadbed; the settlement in the pavement layer is measured by arranging distributed optical fibers at the top and the bottom of the pavement layer to measure the relative displacement of the pavement layer. The method mainly calibrates the pavement settlement by measuring the relative variation, ignores the influence of the variation of the reference object on the measurement result, and also ignores the influence of the packaging layer embedded with the optical fiber on the measurement result in the research and analysis, so the test precision of the method is to be improved. In addition, the above measuring methods are all considered in stages for the road surface state, and the actual situation is that the road surface is frequently in a state with local micro-damage, such as local micro-cracks, pits or ruts. When the pavement is in different service states, the structural deformation states of the pavement are also different, so that the corresponding settlement monitoring method needs to be considered in different situations.
Therefore, the direct measurement method for monitoring the settlement of the long-distance pavement structure considering the influence of the embedded optical fiber packaging layer and the inverse analysis of the joint parameters is provided, and the core of the direct measurement method is to design a rigid and flexible packaging distributed optical fiber sensor respectively according to the rigid or flexible characteristics of the pavement structure and arrange distributed optical fibers into a criss-cross mesh structure so as to construct an optical fiber sensing network covering the longitudinal and transverse deflection deformation monitoring of the pavement structure. Based on longitudinal and transverse distributed deformation information measured by an optical fiber sensing network, when a road surface is in a nondestructive state, inversion of settlement parameters on a horizontal section of a road surface structure is realized by combining an elastic foundation beam theory, and when the road surface is in service with damage states (such as local cracks, pits or ruts) is realized by adopting a mathematical analysis method, so that real-time output of deformation information of the horizontal section of the road surface structure in different states is established, and long-term continuous and effective monitoring of the road surface settlement information is finally realized.
Disclosure of Invention
The invention aims to provide a long-distance pavement structure settlement monitoring method combining a distributed optical fiber sensing technology and parameter inversion analysis, which can respectively design matched distributed optical fiber sensing devices according to the structural characteristics of each layer of a pavement, thereby solving the problem of poor long-term continuous measurement stability, accuracy and durability of an embedded optical fiber sensing device, and simultaneously adopting a mode of respectively laying optical fiber sensing networks on each layer to directly measure the deflection deformation in a horizontal plane of the pavement, thereby solving the problem of low measurement precision caused by the existing relative measurement method, and simultaneously improving the measurement precision by one step based on the reverse evolution of parameters developed by an elastic ground beam theory (the pavement is in a nondestructive state) and a mathematical analysis method (the pavement is in a destructive state).
The technical scheme of the invention is as follows:
a long-distance pavement structure settlement monitoring method combining distributed optical fiber sensing technology and parameter inversion analysis comprises the following implementation steps: according to the structural characteristics of each layer of the pavement, such as an asphalt surface layer, a flexible packaging distributed optical fiber sensing device matched with the cooperative deformation of the pavement, such as a cement stabilized macadam base layer, a rigid packaging distributed optical fiber sensing device matched with the cooperative deformation of the pavement is designed, and meanwhile, the influence of the existence of a packaging layer on the pavement deformation is considered on the basis of a strain transfer theory; according to the pavement settlement characteristics, longitudinally and transversely paving criss-cross distributed optical fiber sensing devices along each layer of the pavement, namely gridding the pavement layer plane, and transmitting the deflection deformation information of each layer of the pavement to the optical fiber sensing network; finally, when the local position in the horizontal plane of the pavement is subjected to deflection deformation, the inversion of longitudinal and transverse settlement parameters of the pavement can be realized by combining an elastic foundation beam theory when the pavement is in a nondestructive state according to the monitoring information of the built-in optical fiber sensing network, the inversion of the longitudinal and transverse settlement parameters of the pavement is realized by introducing a mathematical analysis method when the pavement is in service with micro-damage, and the monitoring of the full-scale settlement in the horizontal plane of the pavement is realized by using a curved surface mesh reconstruction algorithm.
The optical fiber sensing test method for long-distance pavement structure settlement monitoring is characterized in that a layer of intelligent sensing network is additionally arranged in a long-distance pavement structure to be cooperatively deformed with the pavement structure, pavement strain information is continuously monitored according to the optical fiber sensing network, settlement parameter inversion is realized based on an elastic foundation beam theory, and meanwhile, a curved surface reconstruction algorithm is assisted to accurately output the settlement condition of the long-distance pavement structure.
The flexible packaging distributed optical fiber sensor matched with the asphalt surface layer in cooperative deformation can adopt an armored wire embedded with silicon rubber as a packaging protective layer, and the influence of the packaging layer on the measurement deformation can be corrected through a calibration experiment or a strain transfer theory. Considering the temperature field measurement situation of the layer, a white sleeve with a built-in free distribution type optical fiber can be embedded in the armor wires, and only the temperature is measured. The process can enable the flexible packaging distributed optical fiber sensor to have a temperature self-compensation characteristic.
The rigid packaging distributed optical fiber sensor matched with the cement temperature crushed stone base layer for deformation in a coordinated mode can adopt glass fiber reinforced epoxy resin as a packaging protective layer, and influences of the packaging layer on measurement deformation are corrected through a calibration experiment or a strain transfer theory. Similarly, the temperature self-compensation in the single packaged optical fiber device can be realized by adopting a white sleeve mode of embedded free distributed optical fibers.
The curved surface mesh reconstruction algorithm is used for reconstructing the deformation information in the whole curved surface by the discrete point deformation information measured in the curved surface through a curved surface fitting algorithm, so that the monitoring of the deformation information of the curved surface is realized.
The inversion of the settlement parameters based on the elastic foundation beam theory is to simplify the pavement structure in a nondestructive state into the elastic foundation beam, and to input the strain information measured by introducing the distributed optical fiber sensing network into a deflection calculation formula, so as to obtain the settlement of the pavement.
The inversion of the settlement parameters based on the mathematical analysis method is to utilize the geometric relationship to establish the quantitative relationship between the deformation information of the distributed optical fiber measurement and the pavement structure deflection deformation parameters with the micro-damage state, thereby obtaining the pavement settlement.
The invention has the advantages that: the direct measurement method based on the distributed optical fiber measured data and the parameter inversion analysis is provided for the long-distance pavement structure settlement monitoring; the problems of difficulty in real-time accurate monitoring of pavement structure settlement, low survival rate, poor measurement stability and durability of the embedded distributed optical fiber sensor, low measurement identification precision and other monitoring fields are solved; the method realizes continuous and accurate measurement of the settlement of the long-distance pavement structure, and provides an effective early warning mechanism for settlement monitoring and damage estimation of the pavement structure.
Drawings
FIG. 1 is a detailed structural diagram of a flexible package distributed optical fiber sensing device.
Fig. 2 is a schematic diagram of an optical fiber sensing network for long-distance pavement asphalt surface settlement monitoring.
Fig. 3 is a longitudinal section of a long-distance pavement structure of an embedded and encapsulated optical fiber sensing network.
In the figure: 1. a longitudinal distributed optical fiber; 2. a free distributed optical fiber; 3. an armor sleeve; 4. a white casing pipe; 5. a filled silicone rubber; 6. a transverse distributed optical fiber; 7. an optical fiber jumper; 8. a distributed optical fiber demodulator; 9. a flexible asphalt facing; 10. a latex layer; 11. cement stabilized macadam base.
Detailed Description
The following detailed description of the embodiments of the invention refers to the accompanying drawings.
The long-distance pavement structure settlement monitoring method combining distributed optical fiber sensing technology and parameter inversion analysis is described by taking the example of monitoring the settlement of an asphalt pavement surface layer. The detailed structure of the flexible packaging distributed optical fiber sensing device is shown in the attached figure 1; the schematic layout of the optical fiber sensing network for long-distance pavement asphalt surface settlement monitoring is shown as an attached figure 2; the longitudinal section of the long-distance pavement structure of the embedded and packaged optical fiber sensing network is shown in the attached figure 3.
The long-distance pavement structure settlement monitoring method combining the distributed optical fiber sensing technology and the parameter inversion analysis comprises the following implementation modes:
firstly, according to the structural characteristics of a pavement, taking settlement monitoring of a flexible asphalt surface layer 9 as an example, designing an armored sleeve 3 to encapsulate a longitudinal distributed optical fiber 1, fixing the position of the longitudinal distributed optical fiber 1 by placing filled silicon rubber 5 in a pipe, thereby realizing flexible distributed encapsulation of the flexible asphalt surface layer 9, and placing a white sleeve 4 embedded with a free distributed optical fiber 2 at the bottom of the considered pipe wall, thereby realizing temperature self-compensation of a single distributed optical fiber sensor; then, the transverse distributed optical fibers 6 are packaged by the same method, and the packaged longitudinal and transverse distributed optical fibers are arranged into a criss-cross mesh structure (as shown in figure 2), so that the measurement of longitudinal and transverse deflection information of the horizontal plane of the flexible asphalt surface layer 9 is covered; secondly, welding the longitudinal and transverse leading-out optical fibers of the distributed optical fiber sensing network with an optical fiber jumper 7, connecting the optical fiber jumper to a distributed optical fiber demodulator 8, and detecting the smoothness of a longitudinal and transverse optical path; and finally, combining an elastic foundation beam theory (nondestructive) or a mathematical analysis method (destructive) to realize inversion of the settlement parameters according to the monitored strain information, and combining a curve reconstruction algorithm to realize monitoring of the longitudinal and transverse settlement of the asphalt surface layer. When settlement monitoring is required to be carried out on each layer of the pavement, similar optical fiber sensing network monitoring systems are required to be respectively arranged in the latex layer 10 and the cement stabilized macadam base layer 11 in the attached figure 3, and settlement of each layer at different moments is respectively measured. It should be noted that the packaging method of the distributed optical fiber sensing device may be differentiated according to the rigid and flexible characteristics of the measured substrate. For the flexible latex layer 10, a thin-diameter armored sleeve can be adopted to package the distributed optical fiber; for the rigid cement stabilized macadam base 11, the distributed optical fiber may be encapsulated with glass fiber reinforced epoxy resin.
Claims (1)
1. A long-distance pavement structure settlement monitoring method combining distributed optical fiber sensing technology and parameter inversion analysis is characterized in that: according to the structural characteristics of a pavement, an armored sleeve (3) is designed to encapsulate a longitudinal distributed optical fiber (1), the position of the longitudinal distributed optical fiber (1) is fixed in a mode of placing filled silicon rubber (5) in the sleeve, so that flexible distributed encapsulation of a flexible asphalt surface layer (9) is realized, a white sleeve (4) embedded with a free distributed optical fiber (2) is placed at the bottom of the pipe wall, and the temperature self-compensation of a single distributed optical fiber sensing device is realized; then, packaging the transverse distributed optical fibers (6) by adopting the same method, and setting the packaged longitudinal and transverse distributed optical fibers as a criss-cross net structure so as to cover the measurement of the longitudinal and transverse deflection information of the horizontal plane of the flexible asphalt surface layer (9); secondly, welding a longitudinal and transverse leading-out optical fiber of the distributed optical fiber sensing network with an optical fiber jumper (7), connecting the optical fiber to a distributed optical fiber demodulator (8), and detecting the smoothness of a longitudinal and transverse optical path; and finally, according to the monitored strain information, respectively adopting an elastic foundation beam theory when the pavement nondestructive state is considered and utilizing a mathematical analysis method to realize inversion of settlement parameters when the pavement damaged service is considered, and finally combining a curved surface mesh reconstruction algorithm to realize monitoring of longitudinal and transverse settlement of the asphalt surface layer.
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