CN107727483A - A kind of injection shear and method for being used for ground in-situ test based on fiber grating - Google Patents
A kind of injection shear and method for being used for ground in-situ test based on fiber grating Download PDFInfo
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- CN107727483A CN107727483A CN201710983777.8A CN201710983777A CN107727483A CN 107727483 A CN107727483 A CN 107727483A CN 201710983777 A CN201710983777 A CN 201710983777A CN 107727483 A CN107727483 A CN 107727483A
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- 238000012360 testing method Methods 0.000 title claims abstract description 54
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- 239000007924 injection Substances 0.000 title claims abstract description 41
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000000523 sample Substances 0.000 claims abstract description 52
- 239000002689 soil Substances 0.000 claims abstract description 40
- 238000010008 shearing Methods 0.000 claims abstract description 27
- 239000013307 optical fiber Substances 0.000 claims abstract description 26
- 238000005553 drilling Methods 0.000 claims abstract description 23
- 230000003287 optical effect Effects 0.000 claims abstract description 17
- 230000000994 depressogenic effect Effects 0.000 claims abstract description 5
- 230000008054 signal transmission Effects 0.000 claims description 18
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/24—Investigating strength properties of solid materials by application of mechanical stress by applying steady shearing forces
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The present invention relates to a kind of injection shear and method for being used for ground in-situ test based on fiber grating.Including Multi-functional probe, widely different turn drilling apparatus, optical fiber optical grating wireless (FBG) demodulator, casing and base.Described Multi-functional probe includes Y-shaped wrench and cone gauge head, and cone gauge head is arranged on the bottom of Y-shaped wrench；The described widely different drilling apparatus that turns includes feeler lever, chuck, stepper motor, press-in main frame, mounting platform and fixing device；Described feeler lever turns drilling apparatus through entirely widely different from bottom to top, sequentially passes through chuck, stepper motor, mounting platform and press-in main frame, bottom is connected with Multi-functional probe；The home position testing method step is：Clear out a gathering place, in place；Injection；Shearing；Multi-functional probe is depressed into the soil layer of different depth successively, repeats abovementioned steps；Multi-functional probe is extracted, terminates test.The present invention has the advantages that accuracy is high, stability is good, good waterproof performance, anti-electromagnetic interference capability are strong, many reference amounts monitor, auto-real-time monitoring.
Description
Technology neighborhood：
The present invention relates to optical fiber sensing and ground in-situ test field, and in particular to one kind is used for ground based on fiber grating
The injection shear and method of in-situ test.
Technical background：
The soil body typically has moisture content height, void ratio is big, compressibility is high, anti-as a kind of three-phase medium naturally occurred
The features such as cutting low intensity, the harmfulness in engineering construction is big, the problems such as often resulting in foundation failure, slope instability.Therefore it is quick
The physico-mechanical properties for effectively determining foundation soil body is the important topic in Geotechnical Engineering.At present, conventional ground is in situ surveys
Method for testing includes plane-plate loading test, vane shear test and cone penetration test etc..
In general, plane-plate loading test is to determine the most direct also relatively accurate home position testing method of foundation bearing capacity,
But this method cost is higher, time and effort consuming, its application in engineering is limited.Vane shear test is mostly manually operated,
Human error is big.Electrical-logging Vane Shear Test and the cone penetration test for starting appearance in recent years are more complete in theory
It is kind, there is quick, economic, saving manpower, but both approaches can only measure single physical amount, and the measurement of foil gauge
Limited precision, at the scene may be by electromagnetic interference in test process, and short circuit easily occurs in wet environment for foil gauge, no
It is adapted to the test of the water rich strata soil body.
Fibre optical sensor because having the advantages that good high sensitivity, stability, the interference of corrosion-resistant, anti-electromagnetic wave, quasi-distributed,
Development at full speed has been obtained in recent years.Wherein, Fiber Bragg Grating FBG (fiber Bragg grating, abbreviation fiber grating)
It is the optical fiber sensing technology of current comparative maturity, is widely used to multiple necks such as Geological Engineering, Geotechnical Engineering and hydraulic engineering
Domain, a kind of strong instrument is provided for the innovation of ground home position testing method.The sensing principle of fiber grating is, when broadband enters
When penetrating light and entering optical fiber, fiber grating can reflect the light of specific wavelength, the central wavelength lambda of reflected lightBWith strain Δε, temperature Δ T
Between meet following relation：
In formula：KεFor strain sensing sensitivity coefficient, KTFor TEMP sensitivity coefficient, Δ λBCentered on wavelength change
Change amount.For in general fiber-optic grating sensor, Kε≈0.78×10-6με-1, KT≈6.67×10-6℃-1.In fiber grating
Heart wavelength versus temperature and strain are all extremely sensitive, so fiber Bragg grating strain sensor and temperature sensor have very high essence
Degree.Meanwhile the fiber grating of different centre wavelengths can be used in series, quasi-distributed sensing sequence is formed, is realized to optical fiber
Along line strain or the automatic data collection of temperature data.
The content of the invention
For the deficiency of existing ground in-situ testing technique, it is used for it is an object of the invention to provide one kind based on fiber grating
The injection shear and method of ground in-situ test.Compared with conventional method, the present invention have accuracy is high, stability is good,
The advantages that good waterproof performance, anti-electromagnetic interference capability are strong, many reference amounts monitor, auto-real-time monitoring, can obtain static point resistance, soil simultaneously
Body shearing strength and probe temperature, and realize by optical fiber optical grating wireless (FBG) demodulator automatic data collection, the remote transmission of Monitoring Data
Etc. function.
Present invention employs following technical scheme：Dress is sheared in a kind of injection for being used for ground in-situ test based on fiber grating
Put, including Multi-functional probe, widely different drilling apparatus, optical fiber optical grating wireless (FBG) demodulator, casing and base, the Multi-functional probe of turning are worn
Cross in base injection foundation soil body, other end connection is widely different to turn drilling apparatus again via signal transmission fiber and optical fiber optical grating wireless solution
Instrument connection is adjusted, widely different to turn drilling apparatus peripheral hardware casing, casing connects with base；Described Multi-functional probe includes Y words
Shape wrench and cone gauge head, cone gauge head are arranged on the bottom of Y-shaped wrench；The described widely different drilling apparatus that turns includes feeler lever, card
Disk, stepper motor, mounting platform, press-in main frame and fixing device, described feeler lever is from bottom to top through whole widely different turn of drilling dress
Put, sequentially pass through chuck, stepper motor, mounting platform and press-in main frame, feeler lever bottom is connected with Multi-functional probe；Widely different turn of drilling
Device is arranged on casing inwall by fixing device；Described base bottom sets roller and bearing.
By three pieces of angles, 120 ° of triangle metal side plate forms described Y-shaped wrench each other, in each metal side plate all
Installation side plate fiber Bragg grating strain sensor, side plate fiber Bragg grating strain sensor are mutually in series by signal transmission fiber.
Stria is carved with the side plate of described Y-shaped wrench, side plate fiber Bragg grating strain sensor is tightly pasted in stria
Centre, surface cover one layer of epoxy resin.
Described cone gauge head sets gradually cone head, force-transmitting pole, elastic metallic diaphragm, cone head optical fiber light from lower to upper
Grid strain transducer and fiber-optical grating temperature sensor；Cone head fiber Bragg grating strain sensor is close to elastic metallic diaphragm
On, connected by signal transmission fiber with fiber-optical grating temperature sensor.
Described elastic metallic diaphragm is the equal thickness circular sheet that surrounding is fixed.
Described feeler lever is single or multiple series connection, and feeler lever side is provided with fine crack, just allows signal transmission fiber to pass through
Fine crack, and it is placed on feeler lever hollow space.
Using a kind of method of described injection shear for being used for ground in-situ test based on fiber grating, including such as
Lower step：
1) clear out a gathering place, in place：Clear up and smooth place to be measured, device pedestal are fixed on above ground to be measured, signal transmitted
Optical fiber is connected to optical fiber optical grating wireless (FBG) demodulator；
2) injection：It is pressed into main frame and thrust is provided, by the vertical injection of Multi-functional probe to the ground depth to be tested, measurement
The static point resistance and temperature change of Multi-functional probe；
3) shear：Feeler lever is blocked with chuck, stood several minutes, Multi-functional probe is under stepper motor effect, with advance
The shear rate set slowly rotates in soil layer, until surrounding soil is broken completely, measures foundation soil shearing strength；
4) injection again：Complete after once testing, stand several minutes, Multi-functional probe is depressed into each depth to be tested
Degree, the operation of repeat step 2 and step 3；
5) take out：Feeler lever is slowly extracted from soil after the completion of test, clears up Multi-functional probe, all data are equal in test
Gathered in real time with fiber grating wireless demodulation instrument, record to be stored in local and/or be uploaded to high in the clouds sensor and measure, and be used as optical fiber
The temperature-compensating of grating strain transducer.
The static point resistance of Multi-functional probe described in step (2) is derived from by theoretical formula：In formula
psFor static point resistance；ε is the tangential strain of elastic metallic diaphragm, is surveyed by pasting superincumbent cone head fiber Bragg grating strain sensor
；E, h, v are respectively the modulus of elasticity, thickness and Poisson's ratio of elastic metallic diaphragm.
Foundation soil shearing strength described in step (3) is derived from by theoretical formula：Formula
In：τfFor foundation soil shearing strength, E is the modulus of elasticity of Y-shaped wrench side plate；The axial strain of side plate and footpath when α is shearing
To the ratio of strain, determined by rating test；ε1、ε2、ε3Radial strain respectively on each side plate of Y-shaped wrench, by pasting
Side plate fiber Bragg grating strain sensor on side plate measures；R, H is respectively Y-shaped wrench radius and height.
Beneficial effect
1. compared with traditional electrical measurement cross plate shearing instrument and static sounding, the present invention have accuracy is high, stability is good,
Good waterproof performance, anti-electromagnetic interference capability are strong, and will not make moist generation short circuit because of reasons such as Aging equipment or poor sealings, because
This is applied to the in-situ test of the water rich strata soil body.
2. multiple physical quantitys, including static point resistance, shearing strength and probe temperature can be obtained simultaneously using the present invention, three groups
Monitoring Data can be compared to each other, confirm, and the engineering geological condition of physico-mechanical properties and scene to the correct evaluation soil body has
There is important meaning.
3. the present invention uses Y-shaped wrench, compared to traditional cross plate shearing instrument, it is easier in the injection soil body, reduces
To the disturbance of the soil body in situ in test process.
4. by optical fiber optical grating wireless (FBG) demodulator, automatic acquisition, the remote transmission of fiber-optic grating sensor reading are realized
With real-time display etc..
Brief description of the drawings
Fig. 1 is that dress is sheared in the injection for being used for ground in-situ test based on fiber grating of the preferred embodiment of the present invention
Put schematic diagram.
Wherein：1. include Multi-functional probe, 2. it is widely different turn drilling apparatus, 3. optical fiber optical grating wireless (FBG) demodulators, 4. casings,
5. base, 6.Y font wrench, 7. cone gauge heads, 8. feeler levers, 9. chucks, 10. stepper motors, 11. mounting platforms, 12. press-in masters
Machine, 13. fixing devices, 14. rollers, 15. bearings, 16. side plates, 17. fiber Bragg grating strain sensors, 18. signal transmission fibers.
Fig. 2 is the Multi-functional probe schematic diagram of the preferred embodiment of the present invention, including Y-shaped wrench and cone are surveyed
Head.
Wherein：6.Y font wrench, 7. cone gauge heads, 16. side plates, 17-1 are side plate fiber Bragg grating strain sensor, 17-2
For cone head fiber Bragg grating strain sensor, 18. signal transmission fibers, 19. cone heads, 20. force-transmitting poles, 21. elastic metal coatings
Piece, 22. fiber-optical grating temperature sensors.
Stressing conditions schematic diagram when Fig. 3 is the Y-shaped wrench side plate shearing of the present invention.Wherein τfIt is strong for foundation soil shearing resistance
Degree, the soil pressure that F is born by side plate, 2 θ are the drift angle that cone breaks face.
The curve that Fig. 4 is drawn for the result of the test of a preferred embodiment according to the present invention, including point resistance-depth
Degree, shearing strength-depth, temperature-depth curve.
Embodiment
Technical scheme is more specifically described with preferred embodiment below in conjunction with the accompanying drawings.
A kind of injection shear for being used for ground in-situ test based on fiber grating, including Multi-functional probe, widely different turn of brill
Enter device, optical fiber optical grating wireless (FBG) demodulator, casing and base.Described Multi-functional probe includes Y-shaped wrench and cone
Gauge head, cone gauge head are arranged on the bottom of Y-shaped wrench；It is described it is widely different turn drilling apparatus include feeler lever, chuck, stepper motor,
Mounting platform, press-in main frame and fixing device；Described feeler lever turns drilling apparatus through entirely widely different from bottom to top, sequentially passes through card
Disk, stepper motor, mounting platform and press-in main frame, bottom is connected with Multi-functional probe；The widely different drilling apparatus that turns passes through fixing device
It is installed in casing inwall；Described base top placement casing, bottom installation roller and bearing, Multi-functional probe
Passed through among from base, in injection foundation soil body.
Preferably, described Y-shaped wrench is by three pieces of angles, 120 ° of triangle metal side plate forms each other, each metal
A fiber Bragg grating strain sensor is assembled with side plate, three fiber Bragg grating strain sensors are mutual by signal transmission fiber
It is in series.
Preferably, being carved with stria on the side plate of described Y-shaped wrench, fiber Bragg grating strain sensor is tightly pasted
Among stria, surface covers one layer of epoxy resin.
Passed preferably, described cone gauge head includes cone head, force-transmitting pole, elastic metallic diaphragm, fiber grating strain
Sensor and fiber-optical grating temperature sensor；Fiber Bragg grating strain sensor is close on elastic metallic diaphragm, with fiber grating temperature
Spend sensor series.
Preferably, described elastic metallic diaphragm is the equal thickness circular sheet that surrounding is fixed, pass through force-transmitting pole and cone
Tip is connected；When cone head is by resistance, elastic metallic diaphragm occurs bending and deformation, and drives fiber Bragg grating strain sensor
Produce strain.
Preferably, more feeler levers can be connected through a screw thread at the top of described feeler lever, to increase depth of penetration, every feeler lever
Side is provided with fine crack, just allows signal transmission fiber to pass through fine crack, and be placed on feeler lever hollow space.
Preferably, described signal transmission fiber one end is by all fiber Bragg grating strain sensors and temperature sensor string
Connection, one end passes through from feeler lever, extended to outside casing, is connected with optical fiber optical grating wireless (FBG) demodulator.
Further, the user of above-mentioned a kind of injection shear for being used for ground in-situ test based on fiber grating
Method, comprise the following steps：
Step 1 is to clear out a gathering place, in place：Clear up and smooth place to be measured, device pedestal are fixed on above ground to be measured, will believed
Number Transmission Fibers are connected to optical fiber optical grating wireless (FBG) demodulator.
Step 2 is injection：It is pressed into main frame and thrust is provided, the vertical injection of Multi-functional probe is deep to the ground to be tested
Degree, measure the static point resistance and temperature change of Multi-functional probe.
Step 3 is shearing：Feeler lever is blocked with chuck, stand several minutes, Multi-functional probe stepper motor effect under,
Slowly rotated in soil layer with the shear rate pre-set, until surrounding soil is broken completely, measure foundation soil shearing resistance
Intensity.
Step 4 is injection again：Complete once test after, stand several minutes, Multi-functional probe is depressed into be tested it is each
Individual depth, the operation of repeat step 2 and step 3.
Step 5 is taking-up：Feeler lever is slowly extracted from soil after the completion of test, clears up Multi-functional probe.
Preferably, the Multi-functional probe temperature described in step 2 is surveyed by the fiber-optical grating temperature sensor in cone gauge head
, and the temperature-compensating as fiber Bragg grating strain sensor.
Preferably, the static point resistance of the Multi-functional probe described in step 2 is derived from by theoretical formula：P in formulasFor static point resistance；ε is the tangential strain of elastic metallic diaphragm, should by pasting superincumbent fiber grating
Become sensor to measure；E, h, v are respectively the modulus of elasticity, thickness and Poisson's ratio of elastic metallic diaphragm.
Preferably, the foundation soil shearing strength described in step 3 is derived from by theoretical formula：In formula：τfFor foundation soil shearing strength；E is the modulus of elasticity of Y-shaped wrench side plate；α is shearing
When side plate axial strain and radial strain ratio, determined by rating test；ε1、ε2、ε3Respectively Y-shaped wrench is each
Radial strain on side plate, measured by the fiber Bragg grating strain sensor being attached on side plate；R, H is respectively Y-shaped wrench radius
And height.
Preferably, Step 2: temperature and strain data described in three, four are adopted in real time with fiber grating wireless demodulation instrument
Collection, record are stored in local and/or are uploaded to high in the clouds.
Embodiment
As shown in Figures 1 and 2, a kind of injection shear for being used for ground in-situ test based on fiber grating, bag
Include Multi-functional probe 1, widely different turn drilling apparatus 2, optical fiber optical grating wireless (FBG) demodulator 3, casing 4 and base 5.Described is multi-functional
Probe 1 includes Y-shaped wrench 6 and cone gauge head 7, and cone gauge head 7 is arranged on the bottom of Y-shaped wrench 6；Widely different turn of described drilling
Device 2 includes feeler lever 8, chuck 9, stepper motor 10, mounting platform 11, press-in main frame 12 and fixing device 13；Described feeler lever
8 turn drilling apparatus 2 through entirely widely different from bottom to top, sequentially pass through chuck 9, stepper motor 10, mounting platform 11 and press-in main frame
12, bottom is connected with Multi-functional probe 1；The widely different drilling apparatus 2 that turns is installed in the inwall of casing 4 by fixing device 13；Institute
The top of the base 5 placement casing 4 stated, bottom installation roller 14 and bearing 15, Multi-functional probe 1 pass through among base 5,
In injection foundation soil body.
In the present embodiment, by three pieces of angles, 120 ° of triangle metal side plates 16 form described Y-shaped wrench 6 each other, side
The material of plate 16 uses the stainless steel with linear elasticity strain-stress relation, dimensional thickness d × height H × radius R=0.1cm
× 10cm × 5cm, stria is carved with each metal side plate 16, a side plate fiber Bragg grating strain sensor is tightly pasted among stria
17-1, sensor surface cover one layer of epoxy resin, and three side plate fiber Bragg grating strain sensor 17-1 pass through signal light transmission
Fibre 18 is mutually in series.
In the present embodiment, described cone gauge head 7 includes cone first 19, force-transmitting pole 20, elastic metallic diaphragm 21, cone head
Fiber Bragg grating strain sensor 17-2 and fiber-optical grating temperature sensor 22.Described cone head fiber Bragg grating strain sensor
17-2 is close on elastic metallic diaphragm 21, is connected with fiber-optical grating temperature sensor 22.Described elastic metallic diaphragm 21 is
The uiform section circular sheet that surrounding is fixed, is connected by force-transmitting pole 20 with cone first 19, when cone first 19 is by resistance, bullet
Property the flexural deformation of metallic membrane 21, so as to drive the superincumbent fiber Bragg grating strain sensor 17-2 of patch to produce strain.
In the present embodiment, described feeler lever 8 is connected more feeler levers 8 to be single or multiple by screw thread or other fasteners,
To increase depth of penetration, the side of feeler lever 8 is provided with fine crack, just allows signal transmission fiber 18 to pass through fine crack, and be placed on feeler lever 8
Hollow space.Described signal transmission fiber 18 is using a diameter of 0.9mm single mode single tightly packaged fiber, and its one end is by all light
Fiber grating strain transducer 17 and signal transmission fiber 18 are connected, and one end passes through from the hollow space of feeler lever 8, extends to outside cabinet
Outside shell 4, it is connected with optical fiber optical grating wireless (FBG) demodulator 3.
Above-mentioned a kind of application method of the ground in-situ testing device based on fiber grating that the present embodiment provides, including such as
Lower step：
1) clear out a gathering place, in place：Clear up and smooth place to be measured, device pedestal 5 are fixed on above ground to be measured, adjust base 5
Level, signal transmission fiber 18 is connected to optical fiber optical grating wireless (FBG) demodulator 3, debugging optical fiber signal, it is ensured that all the sensors work
Make normal.
2) injection：It is pressed into main frame 12 and thrust is provided, by Multi-functional probe 1 with the vertical injection of about 20mm/s speed to institute
The ground depth to be tested.In injection, cone gauge head 7 measures the static point resistance and temperature change of probe.
3) shear：Feeler lever 8 is blocked with chuck 9, stands 2~5 minutes, effect of the Y-shaped wrench 6 in stepper motor 10
Under, slowly rotated in soil layer with 1 °/10s shear rate, until Y-shaped wrench 6 breaks surrounding soil completely.Y-shaped
Fiber Bragg grating strain sensor 17-1 on the side plate 16 of wrench 6 can measure the radial strain of shear history latus inframedium 16.
4) injection again：Complete after once testing, stand several minutes, Multi-functional probe 1 is depressed into each depth to be tested
Degree, the operation of repeat step two and step 3.Temperature and strain data use demodulated equipment and computer real-time acquisition, record simultaneously
High in the clouds is uploaded to, and is quickly transmitted to the clients such as mobile phone, computer.
5) take out：Feeler lever 8 is slowly extracted from soil after the completion of experiment, clear up Multi-functional probe 1, so as to next time experiment after
It is continuous to use.
In the present embodiment, the temperature change of described Multi-functional probe 1 is by the fiber grating temperature sensor in cone gauge head 7
The measurement of device 22 obtains, and pops one's head in penetration process, should in order to eliminate temperature on fiber grating because friction probe temperature can raise
Become the influence of the result of sensor 17, a fiber-optical grating temperature sensor 22 is installed in the cone gauge head 7 of probe tip, is used as
Temperature-compensating, while the drag size being subject to during injection can be extrapolated according to the change of probe temperature.
In the present embodiment, the static point resistance of described Multi-functional probe 1 and the tangential strain at elastic metallic diaphragm center it
Between have following relation：P in formulasFor static point resistance；ε is the tangential strain at the center of elastic metallic diaphragm 21, by pasting
Superincumbent fiber Bragg grating strain sensor 17-2 is measured；E, h, v be respectively the modulus of elasticity of elastic metallic diaphragm 21, thickness and
Poisson's ratio.
In the present embodiment, it is strong that the radial strain of the side plate 16 of Y-shaped wrench 6 by theoretical formula is derived from foundation soil shearing resistance
Angle value.Its principle is according to the moment M on the side plate 16 of Y-shaped wrench 6PlateThe shearing resistance that should be equal in tapered side is supported to axle center
Resisting moment MSideMoment of resistance M with the shearing resistance of upper surface to axle centerEndSum seeks ground soil classifiction (accompanying drawing 3), i.e.,：
MPlate=MSide+MEnd, the moment of resistance of wherein tapered side isEnd face
Moment of resistance beThe common three parts of the side plate 16 of Y-shaped wrench 6, its moment of flexure is respectively M1、M2、
M3, whereinM2、M3By parity of reasoning, total moment of flexureIn
It is that foundation soil shearing strength isIn formula：τfFor foundation soil shearing strength, E is the side of Y-shaped wrench 6
The modulus of elasticity of plate 16；The ratio of axial strain and the radial strain of side plate 16, is determined by rating test when α is shearing；ε1、
ε2、ε3Radial strain respectively on each side plate 16 of Y-shaped wrench 6；R, H is respectively the radius and height of Y-shaped wrench 6.
It should be noted that in addition to the implementation, patent of the present invention can also have other embodiment.All use is equal
Replace, equivalent transformation and retouching improve the technical scheme formed, in the protection domain for all falling within patent requirements of the present invention.
Claims (10)
1. a kind of injection shear for being used for ground in-situ test based on fiber grating, it is characterised in that including multi-functional spy
Head, it is widely different turn drilling apparatus, optical fiber optical grating wireless (FBG) demodulator, casing and base, Multi-functional probe passes through base injection ground
In the soil body, other end connects the widely different drilling apparatus that turns and is connected again via signal transmission fiber with optical fiber optical grating wireless (FBG) demodulator, widely different turn
Drilling apparatus peripheral hardware casing, casing connect with base；Described Multi-functional probe includes Y-shaped wrench and cone is surveyed
Head, cone gauge head are arranged on the bottom of Y-shaped wrench；The described widely different drilling apparatus that turns includes feeler lever, chuck, stepper motor, peace
Assembling platform, press-in main frame and fixing device, described feeler lever turn drilling apparatus through entirely widely different from bottom to top, sequentially pass through card
Disk, stepper motor, mounting platform and press-in main frame, feeler lever bottom is connected with Multi-functional probe；The widely different drilling apparatus that turns passes through fixation
Device is arranged on casing inwall；Described base bottom sets roller and bearing.
2. a kind of injection shear for being used for ground in-situ test based on fiber grating according to claim 1, it is special
Sign is, by three pieces of angles, 120 ° of triangle metal side plate forms described Y-shaped wrench each other, all pacifies in each metal side plate
Side plate fiber Bragg grating strain sensor is filled, side plate fiber Bragg grating strain sensor is mutually in series by signal transmission fiber.
3. a kind of injection shear for being used for ground in-situ test based on fiber grating according to claim 1, it is special
Sign is, stria is carved with the side plate of described Y-shaped wrench, and side plate fiber Bragg grating strain sensor is tightly pasted in stria
Between, surface covers one layer of epoxy resin.
4. a kind of injection shear for being used for ground in-situ test based on fiber grating according to claim 1, it is special
Sign is that described cone gauge head sets gradually cone head, force-transmitting pole, elastic metallic diaphragm, cone head optical fiber light from lower to upper
Grid strain transducer and fiber-optical grating temperature sensor；Cone head fiber Bragg grating strain sensor is close to elastic metallic diaphragm
On, connected by signal transmission fiber with fiber-optical grating temperature sensor.
5. a kind of injection shear for being used for ground in-situ test based on fiber grating according to claim 4, it is special
Sign is that described elastic metallic diaphragm is the equal thickness circular sheet that surrounding is fixed.
6. a kind of injection shear for being used for ground in-situ test based on fiber grating according to claim 1, it is special
Sign is that described feeler lever is single or multiple series connection, and feeler lever side is provided with fine crack, just allows signal transmission fiber through carefully
Seam, and it is placed on feeler lever hollow space.
7. dress is sheared in a kind of any described injection for being used for ground in-situ test based on fiber grating of usage right requirement 1~6
The method put, it is characterised in that comprise the following steps：
1) clear out a gathering place, in place：Cleaning and smooth place to be measured, device pedestal is fixed on above ground to be measured, by signal transmission fiber
It is connected to optical fiber optical grating wireless (FBG) demodulator；
2) injection：It is pressed into main frame and thrust is provided, by the vertical injection of Multi-functional probe to the ground depth to be tested, measures more work(
The static point resistance and temperature change that can be popped one's head in；
3) shear：Feeler lever is blocked with chuck, stood several minutes, Multi-functional probe is under stepper motor effect, to pre-set
Good shear rate slowly rotates in soil layer, until surrounding soil is broken completely, measures foundation soil shearing strength；
4) injection again：Complete after once testing, stand several minutes, Multi-functional probe is depressed into each depth to be tested, weight
The operation of multiple step 2 and step 3；
5) take out：Feeler lever is slowly extracted from soil after the completion of test, clears up Multi-functional probe, all data are used up in test
Fine grating wireless demodulation instrument gathers in real time, records and is stored in local and/or is uploaded to high in the clouds.
8. use according to claim 7 is used for the side of the injection shear of ground in-situ test based on fiber grating
Method, it is characterised in that the Multi-functional probe temperature described in step (2) is surveyed by the fiber-optical grating temperature sensor in cone gauge head
, and the temperature-compensating as fiber Bragg grating strain sensor.
9. use according to claim 7 is used for the side of the injection shear of ground in-situ test based on fiber grating
Method, it is characterised in that the static point resistance of the Multi-functional probe described in step (2) is derived from by theoretical formula：P in formulasFor static point resistance；ε is the tangential strain of elastic metallic diaphragm, by pasting superincumbent cone head optical fiber
Grating strain transducer measures；E, h, v are respectively the modulus of elasticity, thickness and Poisson's ratio of elastic metallic diaphragm.
10. use according to claim 7 is used for the side of the injection shear of ground in-situ test based on fiber grating
Method, it is characterised in that the foundation soil shearing strength described in step (3) is derived from by theoretical formula：In formula：τfFor foundation soil shearing strength, E is the modulus of elasticity of Y-shaped wrench side plate；α is shearing
When side plate axial strain and radial strain ratio, determined by rating test；ε1、ε2、ε3Respectively Y-shaped wrench is each
Radial strain on side plate, measured by the side plate fiber Bragg grating strain sensor being attached on side plate；R, H is respectively Y-shaped wrench
Radius and height.
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