CN104677422B - Many method of testings and equipment are carried out using the cold area's sandy soil embankment of fiber grating pair - Google Patents
Many method of testings and equipment are carried out using the cold area's sandy soil embankment of fiber grating pair Download PDFInfo
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- CN104677422B CN104677422B CN201510094367.9A CN201510094367A CN104677422B CN 104677422 B CN104677422 B CN 104677422B CN 201510094367 A CN201510094367 A CN 201510094367A CN 104677422 B CN104677422 B CN 104677422B
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Abstract
The present invention relates to a kind of methods and test equipment that many tests are carried out using the cold area's sandy soil embankment of fiber grating pair.Its limitation of current specifications and traditional embankment method of testing is very big.The method of the present invention includes（1）The laying of fiber grating；（2）Fiber grating carrier is selected and grating encapsulation；（3）Embedding position and the determination of depth；（4）Each physical parameter：Deformation, temperature, the grating described in the test of stress are laid in the soil layer of the roadbed of cold area's sandy soil embankment, the light source of fiber grating data collecting instrument, power supply, sensor integration integration；Process of the test is loaded using heavy-load automobile to roadbed, test data is gathered by described fiber grating Acquisition Instrument in loading procedure, it is transferred to the terminal acquisition of fiber grating data (FBG) demodulator, fiber grating data (FBG) demodulator is to data acquisition, analysis and handles, and realizes many tests of the deformation of roadbed under local function, temperature and stress.The present invention is applied to the method that cold area's sandy soil embankment carries out many tests.
Description
Technical field：
The present invention relates to it is a kind of using fiber grating pair tremble with fear area's sandy soil embankment carry out many tests methods and test it is special
Use equipment.
Background technology：
In current specifications and traditional embankment method of testing, most of is laboratory test, only carrying ratio and resistance to compression bullet
Property modulus method can carry out outdoor test；Laboratory test can not simulate Practical Project operating mode, be only capable of to matter of embankment soil material itself
Amount is tested, and assay has significant limitation；CBR, backman beam and FWD are current China's embankments
Site Detection tradition the most and be the measure embankment modulus of resilience that regulation is used in highway industry standard method, but these
The maximum limitation of method is exactly that must be completed in embankment making, and is detected before not carrying out pavement structure making, i.e., can only be
Site Detection is carried out during construction of the highway；And embankment is during long-term use, its character will with load action and temperature,
The change of water environment factor and change；Particularly in Han Qu, highway embankment is chronically in natural environment complicated and changeable, freeze thawing
Circulation and increasingly increased heavy-duty vehicle accelerate the breakdown speed of sandy soil embankment, how to detect cold area's sandy soil embankment in lotus
The lower stabilized soil pavement of the multi- scenarios methods such as load, temperature and water effect is extremely urgent, and above-mentioned traditional detection method is open to traffic in highway
Detected after and seem at a loss what to do for the use of the strength and stability of embankment under many field actions.
The content of the invention：
It is an object of the invention to provide a kind of methods for carrying out many tests using the cold area's sandy soil embankment of fiber grating pair.
Above-mentioned purpose is realized by following technical scheme：
A kind of methods for carrying out many tests using the cold area's sandy soil embankment of fiber grating pair, its method includes following step
Suddenly：
（1）The laying of fiber grating；（2）Fiber grating carrier is selected and grating encapsulation；（3）Embedding position and depth are really
It is fixed；（4）Each physical parameter：Deformation, temperature, the test of stress：The fine grating data acquisition instrument of the collection light requirement of data and optical fiber light
Grid data (FBG) demodulator；Fiber Bragg grating (FBG) demodulator should be measurement low speed change, as stress, the parameter of temperature and pressure and design,
Its capacity allows more than 40 FBG sensors of connection simultaneously on an optical fiber；Described grating is laid in cold area's sandy soil road
In the soil layer of the roadbed of dike, the light source of fiber grating data collecting instrument, power supply, sensor integration integration；Process of the test is used
Heavy-load automobile is loaded to roadbed, is gathered test data by described fiber grating Acquisition Instrument in loading procedure, is transferred to
The terminal acquisition of fiber grating data (FBG) demodulator, fiber grating data (FBG) demodulator is to data acquisition, analysis and handles, and realizes
Many tests of the deformation of roadbed, temperature and stress under local function.
The described methods for carrying out many tests using the cold area's sandy soil embankment of fiber grating pair, described step（1）Light
The laying of fine grating：First, the grating used is Fiber Bragg Grating FBG, and it is a kind of important base in fiber-optic grating sensor
This sensing element, referred to as FBG；Secondly, the beam section between two optical grating points of interception is a computing unit, and it, which deforms calculating, makes
With geometric equation of the non-individual body under small deformation.
The described methods for carrying out many tests using the cold area's sandy soil embankment of fiber grating pair, described step（2）Light
Fine grating carrier selection and grating encapsulation：Grating can not be directly embedded to, it is necessary to such as ABS plastic, pvc pipe, PPR pipe, carbon fiber
Carrier material, it is ensured that fiber grating can resist adverse circumstances under carrier material support protection, without damage, using tube-packaged
Mode is by optical fiber Bragg grating encapsulation to certain carrier；Package tube uses opaque plastic pipe, and adhesive uses epoxide-resin glue, seals
FBG gratings are directly pasted on the plastic tube with epoxy resin during dress, and fiber section is protected using armored jumper；In order to
Cantilever beam structure is constituted, is used using steel pipe as fixing end, two holes for being more than monitoring pipe diameter are bored on steel pipe, monitoring is managed
In patchhole, it is fixed to epoxy adhesive by pipe is monitored on hole；Then the steel of monitoring pipe will be installed using static pressure equipment
In pipe press-in roadbed.
The described methods for carrying out many tests using the cold area's sandy soil embankment of fiber grating pair, described step（3）Bury
The determination of seated position and depth：The relative space position of fiber grating arrangement, one is embankment wheel path, and two be the position of foundation pile；
Change to monitor different depth roadbed under load action, monitoring pipe is embedded in the different depth of roadbed, it monitors depth can
Control the scope for 0-100cm below roadbed.
The fiber grating equipment that many tests are carried out to area's sandy soil embankment of trembling with fear that a kind of above method is used, it constitutes bag
Include：It is same on fiber grating data collecting instrument and fiber grating data (FBG) demodulator, the optical fiber of described fiber grating data collecting instrument
When connection be more than 40 FBG sensors；Each optical grating point is equipped between sensor, 2 optical grating points and is set to a computing unit,
Light source, power supply, sensor integration integration, described grating are laid in the soil layer of the roadbed of cold area's sandy soil embankment.
Described fiber grating equipment, used grating is Fiber Bragg Grating FBG, the selection of fiber grating carrier and light
Grid are encapsulated：Grating carries out tubular type envelope by the pipeline of the materials such as ABS plastic, pvc pipe, PPR pipe, carbon fiber using epoxide-resin glue
Dress, fiber section is protected using armored jumper during encapsulation.
Cantilever beam structure is fixed with outside described fiber grating equipment, described pipeline, is used using steel pipe as fixing end,
Installation monitoring pipe jack is drilled with steel pipe, described pipeline epoxy adhesive is fixed to described hole by pipe is monitored
On；Then the steel pipe for installing monitoring pipe is pressed into roadbed using static pressure equipment.
Beneficial effects of the present invention：
1. the method for the present invention can overcome the drawbacks of traditional detection method can not be detected during highway is open to traffic, its
It is the strength and stability using fiber grating sensing technology to sandy soil embankment under the effect of load, temperature and water multi- scenarios method
Detected, and this method has good applicability, can enter Mobile state to parameters such as deformation, the stress of sandy soil embankment
Detection, the method for testing is easy, cheap, precision is high.
The inventive method sharpest edges be that by the multi- scenarios methods such as load, temperature and water effect under land movement,
The detection of pressure, and do not limited by low temperature and wet environment；Meanwhile, the cold area's sandy soil embankment of fiber grating pair carries out many
The method terminal of test is very succinct, and power is low, it is possible to achieve real-time, dynamic detection.
Brief description of the drawings：
Accompanying drawing 1 is the optical fiber grating structure schematic diagram of the present invention.In figure：1-fiber grating carrier（Containing fiber grating）,
2-fixing end, A, B-fiber-optic grating sensor
Accompanying drawing 2 is the optical fiber grating structure change in displacement schematic diagram of the present invention.ν-displacement in figure
Accompanying drawing 3 is the optical fiber grating structure enlarged diagram of the present invention.H-fiber grating thickness in figure
Embodiment：
Embodiment 1：
The methods for carrying out many tests using the cold area's sandy soil embankment of fiber grating pair, its method comprises the following steps：
（1）The laying of fiber grating；
（2）Fiber grating carrier is selected and grating encapsulation；
（3）Embedding position and the determination of depth；
（4）Each physical parameter：Deformation, temperature, the test of stress：The fine grating data acquisition instrument of the collection light requirement of data and light
Fine raster data (FBG) demodulator；Fiber Bragg grating (FBG) demodulator should be measurement low speed change, as stress, the parameter of temperature and pressure and design
, its capacity allows more than 40 FBG sensors of connection simultaneously on an optical fiber；Described grating is laid in cold area's sandy soil
In the soil layer of the roadbed of embankment, the light source of fiber grating data collecting instrument, power supply, sensor integration integration；Process of the test is adopted
Roadbed is loaded with heavy-load automobile, test data, transmission are gathered by described fiber grating Acquisition Instrument in loading procedure
To the terminal acquisition of fiber grating data (FBG) demodulator, fiber grating data (FBG) demodulator is to data acquisition, analysis and handles, real
Many tests of the deformation of roadbed, temperature and stress under existing local function.
Embodiment 2：
The methods for carrying out many tests using the cold area's sandy soil embankment of fiber grating pair according to embodiment 1, it is described
The step of（1）The laying of fiber grating：First, the grating used is Fiber Bragg Grating FBG（Fiber Bragg Grating）,
It is a kind of important basic sensing element, referred to as FBG in fiber-optic grating sensor；Secondly, between two optical grating points of interception
Beam section be computing unit, it deforms the geometric equation calculated using non-individual body under small deformation.
Embodiment 3：
The methods for carrying out many tests using the cold area's sandy soil embankment of fiber grating pair according to embodiment 1, it is described
The step of（2）Fiber grating carrier is selected and grating encapsulation：Grating can not be directly embedded to, it is necessary to as ABS plastic, pvc pipe, carbon are fine
The carrier materials such as dimension, it is ensured that fiber grating can resist adverse circumstances under carrier material support protection, without damage；Using tubular type
Packaged type is by optical fiber Bragg grating encapsulation to certain carrier；Package tube uses opaque plastic pipe, and adhesive uses epoxy resin
Glue, directly pastes FBG gratings on the plastic tube during encapsulation with epoxy resin, and fiber section is protected using armored jumper
Shield；In order to constitute cantilever beam structure, use using steel pipe as fixing end, two are bored on steel pipe slightly larger than monitoring pipe diameter
Hole, by monitoring pipe patchhole, is fixed on hole with epoxy adhesive by pipe is monitored；And by packaged monitoring pipe level
It is placed in the soil body, wherein monitoring pipe one end needs to fix, so that monitoring pipe is reduced to cantilever beam structure, then utilizes static pressure
The steel pipe for installing monitoring pipe is pressed into roadbed by equipment, and during test, FBG grating horizontal distortions are measured first（As detection pipe water
Flat deformation）, then according to cantilever beam structure feature, the method for applied elasticity calculates the vertical deformation for obtaining testing tube, i.e.,
For the vertical deformation of the soil body；Cantilever beam structure one end needs to use stake to be fixed, and within test period stake elevation not
Can occur any change, but be due to that cold area's winter temperature is extremely low, frost heaving easily occurs for the soil body, certainly will influence the elevation of stake,
Therefore, the present invention is considered in embedded stake, using sand as backfilling material, to prevent influence of the frost heaving to stake elevation.
Embodiment 4：
The methods for carrying out many tests using the cold area's sandy soil embankment of fiber grating pair according to embodiment 1, it is special
Levying is：Described step（3）Embedding position and the determination of depth：The relative space position of fiber grating arrangement, according to road knot
Structure and running car feature, analyze the position of vehicle driving trace, burial place, density and the position of stake of reasonable Arrangement grating
Put, one is embankment wheel path, and two be the position of foundation pile；Change to monitor different depth roadbed under load action, will can monitor
Pipe is embedded in the different depth of roadbed, the scope that it is 0-100cm that it, which monitors depth and can be controlled in below roadbed,.
Embodiment 5：
The fiber grating equipment that many tests are carried out to area's sandy soil embankment of trembling with fear that a kind of embodiment 1 or 2 or 3 or 4 is used,
Its composition includes：Fiber grating data collecting instrument and fiber grating data (FBG) demodulator, described fiber grating data collecting instrument
Connection is more than 40 FBG sensors simultaneously on optical fiber；Each optical grating point is equipped between sensor, 2 optical grating points and is set to one
Computing unit, light source, power supply, sensor integration integration, described grating is laid in the soil of the roadbed of cold area's sandy soil embankment
In layer.
Embodiment 6：
Fiber grating equipment described in embodiment 5, used grating is Fiber Bragg Grating FBG, the choosing of fiber grating carrier
Select and grating encapsulation：Grating is carried out by the pipeline of the materials such as ABS plastic, pvc pipe, PPR pipe, carbon fiber using epoxide-resin glue
Tube-packaged, fiber section is protected using armored jumper during encapsulation.
Embodiment 7：
Cantilever beam structure is fixed with outside fiber grating equipment according to embodiment 6, described pipeline, is used with steel pipe
As fixing end, installation monitoring pipe jack is drilled with steel pipe, described pipeline is fixed with epoxy adhesive by pipe is monitored
Onto described hole；Then the steel pipe for installing monitoring pipe is pressed into roadbed using static pressure equipment.
Claims (1)
1. a kind of methods for carrying out many tests using the cold area's sandy soil embankment of fiber grating pair, it is characterized in that：Its method includes
Following steps：
（1）The laying of fiber grating；
（2）Fiber grating carrier is selected and grating encapsulation；
（3）Embedding position and the determination of depth；
（4）Each physical parameter：Deformation, temperature, the test of stress：The fine grating data acquisition instrument of the collection light requirement of data and optical fiber light
Grid data (FBG) demodulator；Fiber Bragg grating (FBG) demodulator should be measurement low speed change, as stress, the parameter of temperature and pressure and design,
Its capacity allows more than 40 FBG sensors of connection simultaneously on an optical fiber；Described grating is laid in cold area's sandy soil
In the soil layer of the roadbed of embankment, the light source of fiber grating data collecting instrument, power supply, sensor integration integration；Process of the test is adopted
Roadbed is loaded with heavy-load automobile, test data, transmission are gathered by described fiber grating Acquisition Instrument in loading procedure
To the terminal acquisition of fiber grating data (FBG) demodulator, fiber grating data (FBG) demodulator is to data acquisition, analysis and handles, real
Many tests of the deformation of roadbed, temperature and stress under existing local function；
Described step（1）The laying of fiber grating：First, the grating used is Fiber Bragg Grating FBG, and it is fiber grating
A kind of important basic sensing element, referred to as FBG in sensor；Secondly, the beam section between two optical grating points of interception is one
Computing unit, it deforms the geometric equation calculated using non-individual body under small deformation；
Described step（2）Fiber grating carrier is selected and grating encapsulation：Grating can not directly be embedded to, it is necessary to as ABS plastics,
PVC pipes, PPR pipes, the carrier material of carbon fiber, it is ensured that fiber grating can resist severe ring under carrier material support protection
Border, it is without damage, using tube-packaged mode by optical fiber Bragg grating encapsulation to certain carrier；Package tube uses opaque plastic
Pipe, adhesive uses epoxide-resin glue, directly pastes FBG gratings on the plastic tube with epoxy resin during encapsulation, and optical fiber portion
Divide and protected using armored jumper；In order to constitute cantilever beam structure, use using steel pipe as fixing end, two are bored on steel pipe
More than the hole of monitoring pipe diameter, by monitoring pipe patchhole, it is fixed to epoxy adhesive by pipe is monitored on hole；Then it is sharp
The steel pipe for installing monitoring pipe is pressed into roadbed with static pressure equipment；During test, FBG grating horizontal distortions are measured first, are as examined
Test tube horizontal distortion, then according to cantilever beam structure feature, the method for applied elasticity calculates the vertical change for obtaining testing tube
The vertical deformation of shape, the as soil body；Cantilever beam structure one end needs to use stake to be fixed, and within test period stake height
Any change occurs for Cheng Buneng, but is due to that cold area's winter temperature is extremely low, and frost heaving easily occurs for the soil body, certainly will influence the height of stake
Journey, therefore, in embedded stake, using sand as backfilling material, to prevent influence of the frost heaving to stake elevation；Utilize optical fiber light
Grid sensing technology is detected to strength and stability of the sandy soil embankment under the effect of load, temperature and water multi- scenarios method, right
The deformation of sandy soil embankment, stress parameters carry out dynamic detection, realize the soil body position under load, temperature and the effect of water multi- scenarios method
Shifting, the detection of pressure, and do not limited by low temperature and wet environment；
Described step（3）Embedding position and the determination of depth：The relative space position of fiber grating arrangement, one is embankment wheelmark
Band, two be the position of foundation pile；Change to monitor different depth roadbed under load action, monitoring pipe is embedded in the difference of roadbed
Depth, the scope that it is 0-100cm that it, which monitors depth and can be controlled in below roadbed,；
The fiber grating equipment composition of many tests is carried out to area's sandy soil embankment of trembling with fear to be included：Fiber grating data collecting instrument and light
Connection simultaneously is more than 40 FBG sensors on fine raster data (FBG) demodulator, the optical fiber of described fiber grating data collecting instrument；
Each optical grating point is equipped between sensor, 2 optical grating points and is set to a computing unit, light source, power supply, sensor integration one
Body, described grating is laid in the soil layer of the roadbed of cold area's sandy soil embankment；
Used grating is Fiber Bragg Grating FBG, the selection of fiber grating carrier and grating encapsulation：Grating by ABS plastics,
PVC pipes, PPR pipes, the pipeline of carbon fibre material carry out tube-packaged using epoxide-resin glue, and fiber section uses armour during encapsulation
Dress wire jumper is protected；
Cantilever beam structure is fixed with outside described pipeline, is used using steel pipe as fixing end, installation monitoring pipe is drilled with steel pipe
Jack, described pipeline epoxy adhesive is fixed to pipe is monitored on described hole；Then it will be filled using static pressure equipment
Well in the steel pipe press-in roadbed of monitoring pipe.
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| CN105352445B (en) * | 2015-11-16 | 2017-11-24 | 南京航空航天大学 | Unilateral clamped plate malformation fiber mode identification system and scaling method and application |
| CN105911083B (en) * | 2016-05-10 | 2019-03-05 | 东南大学 | A kind of high-speed rail roadbed cement stabilized graded macabam frost heave method for testing performance |
| CN107132172A (en) * | 2017-04-20 | 2017-09-05 | 苏州南智传感科技有限公司 | Rock And Soil seepage flow speed and water content monitoring system and method based on IHAT FBG |
| CN111854682A (en) * | 2020-06-18 | 2020-10-30 | 中交第一公路勘察设计研究院有限公司 | Method and equipment for monitoring uneven settlement of roadbed based on optical fiber implanted threaded beam |
| CN113418641B (en) * | 2021-06-07 | 2022-11-22 | 兰州大学 | Road stress and strain comprehensive monitoring method based on FBG fiber bragg grating sensing technology |
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