CN108982263A - The single pile developed based on soil deformation and shear band recycles t-z model parameter measuring device - Google Patents
The single pile developed based on soil deformation and shear band recycles t-z model parameter measuring device Download PDFInfo
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- 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
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
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Abstract
The invention discloses a kind of single pile circulation t-z model parameter measuring devices, including rack, experimental box, hydraulic loading system, PIV system etc. developed based on soil deformation and shear band；Experimental box is made of for holding the soil body organic glass；Hydraulic loading system is placed in above experimental box, and there are two the effects of aspect for it: (1) for applying consolidation stress to the soil body to simulate various soil mass stress state；(2) vertical cyclic load is applied to stake；PIV system is used to observe pile body in the displacement field variation and the formation and development of stake Soil Interface shear band by vertical cyclic load pile week soil particle.The measurement of pile side friction and pile body shifting when stake may be implemented by cyclic load in the present apparatus, and the related mechanics parameter of pile-soil interaction t-z model is obtained accordingly, on the other hand, it can use the formation and evolution of PIV systematic observation pile peripheral earth deformation and shear band, and then disclose pile-soil interaction under cyclic load from microcosmic point and weaken mechanism.
Description
Technical field
The present invention relates to a kind of single piles developed based on soil deformation and shear band to recycle t-z model parameter measuring device,
The device can measure the relationship of single pile load and displacement under ringing, can get t-z model curve important in engineering；
Simultaneously by PIV observing system, the rule of pile peripheral earth deformation and formation of shear bands development can get, it can be in microcosmic upper interpreted stub
The mechanism of Soil Interface circulation reduction.
Background technique
When bearing vertical uniform load q, vertical drag is mainly derived from stake and surveys and native side friction and end bearing for stake
Power, for commonly for long stake, side friction plays an important role in current engineering.It proposes to use in U.S.'s API specification
T-z model come describe pile side resistance and displacement between relationship, be widely used in engineering design.Related scholar existing at present sets
Experimental provision and experimental method that the unit experiment based on staight scissors carries out test calibration t-z curve are counted out, but this method exists
The influence of boundary effect, thus not can accurately reflect the practical performance situation of pile side friction.
In addition, the changing rule and inherent mechanism for stake by side friction under vertical cyclic load need further to be ground
Study carefully.It is generally acknowledged that partial cut can occur for a certain range of soil body in stake side, and gradually form shearing after by cyclic load
Band, shear band decide the Vertical Bearing Capacity of stake, decide the parameter value of t-z model, however stake side is sheared at present
The formation and development of band recognizes less at present.
Summary of the invention
A kind of developed based on soil deformation and shear band in view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide
The measuring device of single pile circulation t-z model parameter.The characteristics of device, is: can be realized one side lateral frictional force and pile body is perpendicular
To the relationship between displacement, on the other hand can pile body by cyclic load when pile body surrounding soil displacement field monitoring.
The present invention takes following technical scheme:
A kind of single pile circulation t-z model parameter measuring device developed based on soil deformation and shear band, including rack, liquid
Press loading system, experimental box, PIV system；Experimental box is organic glass case for containing soil sample；Hydraulic loading system is placed in experiment
Above case, for applying initial soil pressure to simulate the stress state of the soil body, and vertical cyclic load is provided to simulate reality to stake
The vertical cyclic load that stake in the use of border is subject to；PIV system is used to observe the variation of soil around pile displacement field.
In above-mentioned technical proposal, the rack includes pedestal, main counter-force column, main reaction beam, secondary counter-force column, secondary counter-force
Beam, main counter-force column and time counter-force column are fixed on the base vertically, and main counter-force erection is fixed on main counter-force column, secondary reaction beam
Erection is fixed on time anti-column, and hydraulic loading system includes master cylinder, secondary oil cylinder, be fixedly installed in respectively main reaction beam and time
Below reaction beam；The pile body is that conventional pile body is longitudinal to half after cuing open along axis, and pile body section is close to experiment chamber interior wall
It squeezes into soil sample, and pile body lower end passes through experimental box bottom and pedestal and hanging, is connected below master cylinder with pile crown loading end,
Upper plate is placed in experimental box soil sample, secondary oil cylinder lower end is connected with upper plate.Master cylinder is used to apply vertical cyclic load to pile body,
With the load action (vehicular load etc.) that in simulation actual use, pile body is subject to.Secondary oil cylinder is used for the soil body into case and applies pressure,
For simulating the soil body of different concretion states.
The PIV system includes computer, laser emitter, synchronizer, CCD camera, scattering light beam, passes through computer
It controls synchronizer and adjusts laser emitter light source, light is uniformly beaten on the soil body by scattering light beam scattering, and CCD camera shooting is whole
The variation of the soil around pile particle of a pile body, and photographing information is fed back into computer.
All contact surfaces of the pile body and experimental box are wiped with vaseline.
Previous t-z observation device due to that can not overcome the influence of end resistance and then cause large error to experimental result,
The present apparatus is using making an end vacantly eliminate end resistance and subtract as far as possible in the contact surface of pile body and experimental box by vaseline
The influence of frictional resistance between paxilla and glass box.
When master cylinder is further applied load as t, corresponding pile end displacement is z at this time, and shearing force size is τ between stake soil, then has:
Wherein: L: stake is long (m)；
D: stake diameter (m).
Stake soil shearing force τ can be acquired according to above formula, the soil body of shear band meets Hooke's law, therefore:
T=kz
Wherein: k: the stiffness coefficient (kN/m) of shear band soil；
Z: the displacement (m) of pile body.
The stiffness coefficient of shear band soil can be thus to obtain under cyclic load.
On the one hand stake side displacement and resistance of the stake under cyclic load can be measured using the device of the invention, to t-
Z model parameter is demarcated, and t-z curve is acquired, and on the other hand, can be observed the deformation of Pile side soil body, be observed the formation of shear band
Development, from the angle of soil deformation, probes into influence of the cyclic load to shear band soil body stiffness coefficient, further discloses stake soil and makees
Use mechanism.
Detailed description of the invention
Fig. 1 is shear band simplified model；
Fig. 2 is experimental box structural schematic diagram (front elevation) of the invention；
Fig. 3 is overall structure diagram of the invention (left view)；
Fig. 4 is experimental box structural schematic diagram (sectional view) of the invention；
Fig. 5 is PIV schematic device；
Fig. 6 is experimental box structural schematic diagram (top view) of the invention；
Fig. 7 is pile body schematic diagram (top view) in the present invention；
Wherein, 1. main reaction beams, 2. master cylinders, 3. main anti-columns, 4. soil samples, 5. pile bodies, 6. balls, 7. pedestals, on 8.
Plate, 9.LVDT, 10.LVDT fixed device, 11. axle power meters, 12. reaction beams, 13. oil cylinders, 14. axle power meters, 15. counter-forces
Column, 16.CCD camera, 17. camera supports, 18. synchronizers, 19. laser emitters, 20. scattering light beam brackets, 21. scattering light
Column.
Specific embodiment
Referring to Fig. 2-7, the survey of the single pile circulation t-z model parameter of the invention developed based on soil deformation and shear band
Measure device, including rack, hydraulic loading system, experimental box, PIV system；Rack includes pedestal 7, main counter-force column 3, main reaction beam
1, secondary counter-force column 15, secondary reaction beam 12, main counter-force column 3 and time counter-force column 15 are fixed on pedestal 7 vertically, main 1 frame of reaction beam
If being fixed on main counter-force column 3, the secondary erection of reaction beam 12 is fixed on time anti-column 15, and experimental box is that organic glass case is used for
Soil sample is contained, is fixed on pedestal, upper plate is placed above soil sample；Pile body 5 is conventional pile body along longitudinal half to after cuing open of axis
Stake, pile body section is close to experiment chamber interior wall and is squeezed into soil sample, and pile body lower end passes through experimental box bottom and pedestal and hanging, pile body
It includes master cylinder 2, secondary oil cylinder 13 that 6 hydraulic loading system of ball, which can be set, with experimental box bottom, is fixedly installed in respectively main anti-
12 lower section of power beam 1 and time reaction beam, master cylinder is connected with pile crown loading end, for loading vertical cyclic load, secondary oil to pile body
Cylinder is connected for applying pressure to the soil body, for simulating the soil body of different concretion states with upper plate.PIV system is for observing stake week
The variation of native displacement field, including computer, laser emitter 19, synchronizer 18, CCD camera 16, scattering light beam 21, pass through meter
Calculation machine controls synchronizer 18 and adjusts 19 light source of laser emitter, and light is scattered by scattering light beam 21 and uniformly beaten on the soil body, CCD
Camera 16 shoots the variation of the soil around pile particle of entire pile body, and photographing information is fed back to computer.
All contact surfaces of the pile body and experimental box are wiped with vaseline, additionally can be in experimental box bottom and stake
The contact site insertion ball of body to reduce influence of the frictional resistance to experiment as far as possible.
In addition, the observation device can also include software and data collection system, such as computer, data collecting instrument, number
Each sensor is connected according to Acquisition Instrument and carries out data acquisition, and computer is analyzed and processed data and is issued according to user setting
Instruction.
The test process for using apparatus of the present invention is sketched by taking sandy soil sample as an example below:
When work, servo loading system is dismantled, vaseline is spread into the smooth side of stake, stake is put into glass box,
Groove alignment above stake central axes and glass box, the lower end of stake pass through experimental box bottom opening, first stake are artificially fixed, to glass
Sandy soil are added in case, stake is fixed by sandy soil at this time, and upper plate is placed on sandy soil.Servo loading system is installed, consolidation lotus is applied
It carries, stablizes to soil deformation.
2. opening PIV system, the real-time monitoring of soil around pile particle displacement field when by cyclic load is realized to stake.
3. applying vertical cyclic load to stake by Serve Motor Control master cylinder, the available pile body position LVDT is utilized
It moves, the lateral frictional resistance of stake can be read using oil cylinder, acquires t-z curve.
After test, experimental box is carefully cleared up, prepares lower battery of tests.
Claims (4)
1. a kind of single pile developed based on soil deformation and shear band recycles t-z model parameter measuring device, which is characterized in that packet
Including rack, hydraulic loading system, experimental box, PIV system；Experimental box is organic glass case for containing soil sample；Hydraulic loaded system
System is placed in above experimental box, for applying initial soil pressure to simulate the stress state of the soil body, and provides vertical circulation lotus to stake
It carries to simulate the vertical cyclic load that the stake in actual use is subject to；PIV system is used to observe the variation of soil around pile displacement field.
2. a kind of single pile circulation t-z model parameter developed based on soil deformation and shear band according to claim 1 is surveyed
Measure device, which is characterized in that the rack include pedestal (7), main counter-force column (3), main reaction beam (1), secondary counter-force column (15),
Secondary reaction beam (12), main counter-force column (3) and time counter-force column (15) are fixed on vertically on pedestal (7), and main reaction beam (1) sets up solid
Due on main counter-force column (3), secondary reaction beam (12) erection is fixed on time anti-column (15), and hydraulic loading system includes master cylinder
(2), secondary oil cylinder (13) is fixedly installed in respectively below main reaction beam (1) and time reaction beam (12)；The pile body (5) is normal
It is longitudinal to half after cuing open along axis to advise pile body, pile body section is close to experiment chamber interior wall and is squeezed into soil sample, and pile body lower end passes through
Experimental box bottom and pedestal are simultaneously hanging, are connected below master cylinder with pile crown loading end, are placed with upper plate on experimental box soil sample (4)
(8), secondary oil cylinder lower end is connected with upper plate.
3. a kind of single pile circulation t-z model parameter developed based on soil deformation and shear band according to claim 1 is surveyed
Measure device, which is characterized in that the PIV system includes computer, laser emitter (19), synchronizer (18), CCD camera
(16), light beam (21) are scattered, laser emitter (19) light source is adjusted by computer control synchronizer (18), light passes through scattering
Light beam (21) scattering is uniformly beaten on the soil body, and CCD camera (16) shoots the variation of the soil around pile particle of entire pile body, and will shooting
Information feeds back to computer.
4. a kind of single pile circulation t-z model parameter developed based on soil deformation and shear band according to claim 1
Measuring device, which is characterized in that all contact surfaces of the pile body and experimental box are wiped with vaseline.
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Cited By (5)
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| CN109868849A (en) * | 2019-01-28 | 2019-06-11 | 重庆大学 | A kind of pile-soil interaction visual test device and its test method |
| CN110376063A (en) * | 2019-07-22 | 2019-10-25 | 山东华鉴工程检测有限公司 | One kind being used for load-bearing structure periphery land movement field measurement experimental rig and method |
| CN111307857A (en) * | 2019-11-21 | 2020-06-19 | 江苏亚特尔地源科技股份有限公司 | Visual energy pile model test system and non-contact measurement method thereof |
| CN111829894A (en) * | 2020-06-24 | 2020-10-27 | 山东大学 | Rock-soil multi-field measurement test system and method |
| CN114739353A (en) * | 2022-03-07 | 2022-07-12 | 浙江理工大学 | Pile-soil interaction visual anti-interference experimental device and experimental method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109868849A (en) * | 2019-01-28 | 2019-06-11 | 重庆大学 | A kind of pile-soil interaction visual test device and its test method |
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| CN111307857A (en) * | 2019-11-21 | 2020-06-19 | 江苏亚特尔地源科技股份有限公司 | Visual energy pile model test system and non-contact measurement method thereof |
| CN111829894A (en) * | 2020-06-24 | 2020-10-27 | 山东大学 | Rock-soil multi-field measurement test system and method |
| CN114739353A (en) * | 2022-03-07 | 2022-07-12 | 浙江理工大学 | Pile-soil interaction visual anti-interference experimental device and experimental method |
| CN114739353B (en) * | 2022-03-07 | 2023-10-27 | 浙江理工大学 | Pile-soil interaction visual anti-interference experimental device and experimental method |
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