CN102213583A - Low-modulus optical fiber sensing probe for testing internal stress of flexible road structure - Google Patents
Low-modulus optical fiber sensing probe for testing internal stress of flexible road structure Download PDFInfo
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- CN102213583A CN102213583A CN 201110056822 CN201110056822A CN102213583A CN 102213583 A CN102213583 A CN 102213583A CN 201110056822 CN201110056822 CN 201110056822 CN 201110056822 A CN201110056822 A CN 201110056822A CN 102213583 A CN102213583 A CN 102213583A
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Abstract
The invention discloses a low-modulus optical fiber sensing probe for testing internal stress of a flexible road structure and belongs to the technical field of road structure stress tests. The probe is characterized in that: a small-diameter optical fiber sensitive element is subjected to end expansion through a clamping material, so that relative displacement is not generated between the optical fiber sensitive element and the clamping material, and the corresponding dimension is simulated and optimized through a finite element; and the optical fiber sensitive element is packaged by a modulus adjustable flexible packaging material, so that the optical fiber sensitive element is in stress coordination with a matrix, and the dimension is simulated and optimized through the finite element. The invention has the advantages that: the probe can be laid in the process of laying a hot mix asphalt concrete pavement, and cannot be damaged in the pavement compaction process; the deformation of the optical fiber sensitive element is consistent with that of the packaging material; and the sensing probe does not influence an internal stress field of the pavement and can guarantee cooperative deformation of a sensor and a pavement structure.
Description
Technical field
The invention belongs to pavement structure stress test technical field, is that a kind of pavement structure internal stress that neither influences distributes, and can also realize with the pavement structure cooperative transformation, accurately testing the low modulus packaged fiber sensing probe of flexible pavement structurally internal stress.
Background technology
Road, especially highway are built and the long service property relationship arrives traffic safety, and the accurate assurance of the internal stress when the road pavement structure is on active service is the most important means of understanding the pavement structure performance.Flexible pavement such as bituminous concrete pavement account for significant proportion in the different kinds of roads form of China.Because the unevenness that its each layer (even with layer) material is formed, the parameter uncertainty that causes with environmental impact, the low modulus of flexible pavement structure and viscoelastic sluggish response, and the big length of road structure itself (hundreds of kilometer easily), cross over reason such as different geologic provinces, make existing traditional civil engineering work sensing technology to satisfy the demand, have shortcomings such as volume is big, rigidity is high, measuring point covers less, poor durability.
Utilizing specialized equipment equipment is pavement structure evaluation measures commonly used both at home and abroad at laboratory inspection pavement structure sample, and as dynamic shear rheometer, direct tensile test instrument and advanced dynamic modulus tester etc. all are typical equipment and instruments.Though the laboratory sample detecting generally can both accurately be measured designated parameter, need the road pavement structure to carry out destructiveness cutting, and since the limitation of laboratory sample size carry out the simulated roadway loading experiment and be difficult to reflect true road surface response condition.At present Dynamic Non-Destruction Measurement is the main means during pavement structure detects, and elastic modulus, the ground penetrating radar that is used to detect the road surface as Falling Weight Deflectometer is used to survey the specific inductive capacity etc. that moisture volume under pavement destruction and the brea bed, electric capacity probe method are used to measure road surface thickness and asphalt surface.Regrettably, though Dynamic Non-Destruction Measurement generally can not cause damage to pavement structure, its data precision, reliability and cost all are the key issues of its development of restriction.
Fibre Optical Sensor is little with its volume, precision is high, good endurance, distributedly cover on a large scale, absolute measurement or the like plurality of advantages demonstrates the big potential of tool in the test of pavement structure internal stress.Yet because the shear resistance of fiber optic materials (SiO2) own is poor, can't be competent at the laying of extensive style and abominable Service Environment, must adopt encapsulation technology in pavement structure, to lay.Method for packing in the past is used for pavement structure and still has the excessive problem of rigidity, is difficult to realize coordinate with the matrix strain.
The present invention intends the flexible encapsulant material that adopts modulus adjustable, makes its planted agent field of force that neither influences the road surface, also can guarantee sensor and its cooperative transformation.Consider the modulus difference of encapsulating material and optical fiber glass material, optical fiber to minor diameter carries out the end hole enlargement, and optimize its corresponding size by finite element analogy, and guarantee that the distortion of optical fiber sensitive element is consistent with encapsulating material, make pavement strain accurately be delivered on the optical fiber sensitive element.
Summary of the invention
The present invention be directed to the low modulus optical fiber sensing probe of flexible pavement structural design, can under the condition that does not influence the distribution of pavement structure internal stress, coordinate, accurately measure internal stress with the structure internal strain.
Sensing probe among the present invention is mainly by the low modulus encapsulated layer, the optical fiber clamping, and bare fibre or fiber reinforced resinous material flexible package optical fiber sensitive element and test wire jumper four parts are formed.Implementation method is to utilize certain thickness clamping material that the two ends of bare fibre or fiber reinforced resinous material flexible package optical fiber sensitive element are retrained respectively, promptly under the prerequisite of not destroying optical fiber, makes optical fiber sensitive element and clamping storeroom not produce relative displacement.Then optical fiber and clamping material one are reinstated the low modulus encapsulating material and encapsulate typing.This sensor can be laid in the Hot-mix Bituminous Concrete Pavement pavement process.The encapsulating material of sensor surface can strengthen the cooperative transformation ability with bonding the melting mutually of ground surface material under laying high temperature and rolling.Simultaneously, the clamping material has carried out the end hole enlargement to the optical fiber of minor diameter, can make the central optical fiber that passes to of pavement structure strain more efficient.
The present invention also has some feature technologies like this:
Described low modulus encapsulating material can be polypropylene PP plastics, metal-rubber or asphalt mastic etc., at different highway layout situations, or different structure layer feature, can change the modulus that the volume ratio of each composition of encapsulating material is regulated sensing probe.
The described clamping material that is used for the optical fiber end hole enlargement can use fibre reinforced plastics (FRP) or marmem etc., and its size can be determined by finite element analysis, computation optimization in conjunction with concrete job requirement.
Described optical fiber sensitive element can provide the fiber grating of pavement structure partial high-precision strain information; Also can be brillouin distributed optical fiber, in order to detect overall Strain Distribution situation.
The length of described optical fiber sensitive element and fiber grating writing position are determined by the test request of concrete work.
The low modulus packaged fiber sensing probe that the present invention proposes has avoided the sensor of rigidity encapsulation to be laid on caused local Internal Force Redistribution problem in the pavement structure of relative flexibility.Encapsulating material also can be protected inner fragile very thin optical fiber, eliminates when directly laying bare fibre, and the displacement of road surface aggregate (stone) under load destroys the extrusion that optical fiber produces.Hot asphalt pavement construction process need is controlled at the temperature of compound in the certain high temperature scope, lay this sensor this moment, high temperature and pavement compaction effect can strengthen the bonding of sensor surface encapsulating material and ground surface material, have improved the cooperative transformation ability of sensor and pavement structure.Generally speaking, optical fiber can both guarantee operate as normal at 200 ℃ with interior, and the optical fiber after the special processing can be tolerated higher environment temperature, so construction temperature is controlled at 170 ℃ and mats formation with interior Hot-mix Bituminous Concrete Pavement and can the performance to sensor not exert an influence on temperature.Optical fiber to sensing probe inside carries out the end hole enlargement, has also guaranteed the distortion of optical fiber sensitive element and the consistance of encapsulating material, thereby realizes that optical fiber accurately obtains the internal strain of flexible pavement structure.
Description of drawings
Accompanying drawing is the structural representation of the optical fiber sensing probe of the flexible package that proposes of the present invention.
Among the figure: 1 low modulus encapsulated layer; 2 optical fiber clampings; 3 bare fibres or fiber reinforced resinous material flexible package optical fiber sensitive element; 4 test wire jumpers.
Embodiment
Be described in detail the specific embodiment of the present invention below in conjunction with technical scheme and accompanying drawing.
(1) structure of sensing probe
Sensing probe structure among the present invention as shown in Figure 1, mainly by 1 low modulus encapsulated layer, 2 optical fiber clampings, 3 bare fibres or fiber reinforced resinous material flexible package optical fiber sensitive element and 4 test wire jumpers four parts are formed.Wherein the optical fiber sensitive element is the strain perception and the measuring sensor of sensing probe, can be accurately to measure the fiber grating of local train, also can be the brillouin distributed optical fiber that detects overall Strain Distribution.The optical fiber retained part is to utilize FRP or marmem that the optical fiber of minor diameter is carried out the end hole enlargement, can guarantee that optical fiber is consistent with the encapsulating material strain through the size of FEM (finite element) calculation optimization.By the PP plastics, low modulus that asphalt mastic or other materials are synthetic and adjustable encapsulation can be protected the distortion of optical fiber and collaborative and pavement structure.This structural design has guaranteed that the strain in the flexible pavement structure passes to measuring optical fiber accurately.
(2) making of sensing probe
The sensing probe manufacturing process that the present invention relates to comprises that mainly optical fiber grips and two steps of overall package.At first, realize the no plastic clip at bare fibre or fiber reinforced resinous material flexible package optical fiber sensitive element two ends is held, guarantee that optical fiber retained part and clamping material do not have relative displacement by processing technology according to the character of clamping material (FRP or marmem).Use the PP plastics then, asphalt mastic or other materials carry out overall package with optical fiber and clamping material.Optical fiber, the size of clamping and encapsulating material and encapsulating material modulus is by the real work requirement, finite element analysis, and computation optimization is determined.
(3) laying of sensing probe
The sensing probe distribution method that proposes among the present invention is: at first in the pavement construction process, when being routed to when needing to detect the layer position of internal force, sensor press the direction of measurement placement in the measuring position, and will test wire jumper and prolong the road surface and laterally draw.The asphalt that uses of shop construction up then, and according to actual compacting means will lay sensor region and on every side pavement structure together carry out compacting.After pavement construction is finished or sensor lay finish after, the test jumper terminal can be connected test structure internal strain situation with Fibre Optical Sensor demodulation instrument.
Claims (3)
1. the low modulus optical fiber sensing probe of flexible pavement structurally internal stress test, it is characterized in that (1) modulus material with adjustable polypropylene PP plastics, metal-rubber or asphalt mastic are used for (2) optical fiber sensitive element and carry out the low modulus encapsulation, change the modulus of the volume ratio adjusting sensing probe of each composition of encapsulating material; (3) fibre reinforced plastics (FRP) or marmem are used for the two ends hole enlargement clamping of bare fibre or fiber reinforced resinous material flexible package optical fiber sensitive element, and determine size by finite element analysis, computation optimization.
2. the low modulus optical fiber sensing probe of a kind of flexible pavement structurally internal stress test according to claim 1 is characterized in that: adopt low-modulus material (1) packaged fiber sensing element (2) to make sensor not influence the pavement structure internal stress; Optical fiber sensitive element (2) is fiber grating or brillouin distributed optical fiber; Clamping material (3) is used to coordinate the distortion between optical fiber sensitive element (2) and the encapsulating material (1).
3. the low modulus optical fiber sensing probe of a kind of flexible pavement structurally internal stress test according to claim 1 and 2 is characterized in that: mix in the construction at asphalt surface hot and lay, encapsulating material (1) merges with the road surface matrix surface.
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| CN 201110056822 CN102213583A (en) | 2011-03-10 | 2011-03-10 | Low-modulus optical fiber sensing probe for testing internal stress of flexible road structure |
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| CN 201110056822 CN102213583A (en) | 2011-03-10 | 2011-03-10 | Low-modulus optical fiber sensing probe for testing internal stress of flexible road structure |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102628673A (en) * | 2012-03-30 | 2012-08-08 | 大连理工大学 | Armor optical fiber sensor suitable for road structure full size monitoring |
| CN106338238A (en) * | 2016-08-09 | 2017-01-18 | 大连理工大学 | Coordinate measuring machine-strain joint measuring method for large-scale component |
| CN108253904A (en) * | 2018-01-31 | 2018-07-06 | 北京航天控制仪器研究所 | A kind of sensitizing type fiber-optic grating sensor and strain monitoring system and method |
| CN108716891A (en) * | 2018-04-28 | 2018-10-30 | 河南理工大学 | A kind of underworkings surrouding rock deformation quickly accurately monitors system and its monitoring method |
| CN112629401A (en) * | 2020-12-04 | 2021-04-09 | 山东大学 | Method for manufacturing road surface structure strain sensor and sensor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101140160A (en) * | 2007-10-19 | 2008-03-12 | 大连理工大学 | Encapsulation method for optical fibre grating add-and-subtract quick strain sensor |
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2011
- 2011-03-10 CN CN 201110056822 patent/CN102213583A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101140160A (en) * | 2007-10-19 | 2008-03-12 | 大连理工大学 | Encapsulation method for optical fibre grating add-and-subtract quick strain sensor |
Non-Patent Citations (1)
| Title |
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| 《Sensor Systems and Networks: Phenomena, Technology, and Applications for NDE and Health Monitoring 2007，edited by Kara J. Peters, Proc. of SPIE》 20071231 Chuan Wang et al "Study on the Fabricating Process Monitoring of Thermoplastic Based Materials Packaged OFBG and Their Sensing Properties" 第65300Z-1~ 65300Z-8页 第6530卷, * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102628673A (en) * | 2012-03-30 | 2012-08-08 | 大连理工大学 | Armor optical fiber sensor suitable for road structure full size monitoring |
| CN106338238A (en) * | 2016-08-09 | 2017-01-18 | 大连理工大学 | Coordinate measuring machine-strain joint measuring method for large-scale component |
| CN106338238B (en) * | 2016-08-09 | 2018-04-24 | 大连理工大学 | A kind of big three coordinates of component-strain union measuring method |
| CN108253904A (en) * | 2018-01-31 | 2018-07-06 | 北京航天控制仪器研究所 | A kind of sensitizing type fiber-optic grating sensor and strain monitoring system and method |
| CN108253904B (en) * | 2018-01-31 | 2021-02-09 | 北京航天控制仪器研究所 | Sensitization type fiber bragg grating sensor, strain monitoring system and strain monitoring method |
| CN108716891A (en) * | 2018-04-28 | 2018-10-30 | 河南理工大学 | A kind of underworkings surrouding rock deformation quickly accurately monitors system and its monitoring method |
| CN108716891B (en) * | 2018-04-28 | 2020-10-30 | 河南理工大学 | Rapid and accurate monitoring system and monitoring method for underground roadway surrounding rock deformation |
| CN112629401A (en) * | 2020-12-04 | 2021-04-09 | 山东大学 | Method for manufacturing road surface structure strain sensor and sensor |
| CN112629401B (en) * | 2020-12-04 | 2022-04-01 | 山东大学 | Method for manufacturing road surface structure strain sensor and sensor |
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Application publication date: 20111012 |