CN108982265A - A kind of experimental provision of stake soil shear action observation and measurement based on PIV technology - Google Patents
A kind of experimental provision of stake soil shear action observation and measurement based on PIV technology Download PDFInfo
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- CN108982265A CN108982265A CN201810779841.5A CN201810779841A CN108982265A CN 108982265 A CN108982265 A CN 108982265A CN 201810779841 A CN201810779841 A CN 201810779841A CN 108982265 A CN108982265 A CN 108982265A
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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
- G01N3/32—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 experimental provision of the invention discloses a kind of stake soil shear action observation and measurement based on PIV technology, including rack, hydraulic loading system, experimental box, PIV system, the vertical positioning system of pile body, pile body sensor-based system；Experimental box is for holding soil sample；Hydraulic loading system is used to apply stress to the soil body and control pile body is squeezed into soil sample；The vertical positioning system of pile body is for vertically positioning pile body；PIV system is used to observe the displacement field variation and the formation of stake Soil Interface shear band that pile body squeezes into pile week soil particle, and pile body sensor-based system includes the various sensor being mounted in stake, for measuring various parameters.Stake not only may be implemented in process of squeezing into or by the measurement of the collateral resistance, end resistance of stake when recycling vertical load in the present apparatus, and stake can be observed in real time by PIV technology and survey the deformation of the soil body and the formation of shear band, design parameter can be both provided for engineering, the mechanism of stake soil shear action can also be studied in conjunction with visual land movement.
Description
Technical field
The experimental provision of the present invention relates to a kind of stake soil shear action observation and measurement based on PIV technology, can see
Soil deformation, formation of shear bands development process when pile squeezes into process and pile body by circulation vertical load.
Background technique
Pile-soil interaction is the installation and military service performance for determining pile foundation.Driven pile is widely used in industry and civilian builds at present
Build ground, pile formula roadbed, port engineering, ocean engineering, injection resistance of the stake when various soil mass and various soil mass depth are squeezed into
Power affects the demand to equipment is squeezed into, thus it is particularly important to the construction of driven pile to measure penetration resistance of the stake in the soil body.
On the other hand, after stake is installed, stake Soil Interface, which is responded, when by vertical cyclic load decides the long-term of pile foundation
Load-carrying properties, such as roadbed subsidence problem of the high speed roadbed by the vehicular load recycled, marine fan jacket foundation are vertical
The problem of bearing capacity circulation reduction etc..
At present for the existing a large amount of research of stake Soil Interface shear action of the stake in process of squeezing into and circulation load-bearing, research
Think that the key for disclosing pile-soil interaction is to obtain the formation and development of the displacement field and shear band of soil around pile；Also have at present
Some shears based on stake soil unit, these devices can measure resistance of the interface in vertical load-bearing.However these
The formation and development of land movement and interface shearing band when pile-soil interaction can not be intuitively presented in device, and these are exactly
The key factor of stake Soil Interface is influenced, therefore in order to disclose the essence of Soil Interface shear property, it is necessary to while obtaining stake and existing
It squeezes into and mechanics parameter when by vertical load and the shaping and development of corresponding land movement and shear band at this time, and by the two
Combine, to which the essence of stake Soil Interface shearing can be disclosed by the experimental provision.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide a kind of stake soil shear action based on PIV technology
The experimental provision of observation and measurement, the device can be observed in real time and record driven pile stake week under the conditions of burying and by cyclic load
The deformation of soil and the related mechanics parameter of pile body can study the rule of shear band development and the variation of soil particle displacement field.It should
The characteristics of device, is: various mechanics parameters such as end bearing during on the one hand capable of being buried by the various sensors of setting to driven pile
The data such as power, pile side resistance and pore water pressure carry out real-time measurement, on the other hand, can observe stake squeeze into process and pile body by
Soil deformation when to circulation vertical load, soil around pile particle displacement field in formation of shear bands development process and whole process.
The present invention takes following technical scheme:
A kind of experimental provision of stake soil shear action observation and measurement based on PIV technology, including rack, hydraulic loaded system
System, experimental box, PIV system, pile body vertical positioning system, pile body sensor-based system；
Experimental box includes the organic glass case for containing soil sample, and one side wall surface is transparent；Hydraulic loading system is placed in reality
Above tryoff, soil sample is squeezed into for applying the stress state of the initial soil pressure simulation soil body, and for controlling pile body；Pile body hangs down
Straight positioning system is for keeping pile body in vertical state；Pile body is adjacent to organic glass case transparent wall surface when squeezing into soil sample, pass through PIV
The displacement field of systematic observation soil body soil particle during stake is squeezed into changes and the formation and development situation of shear band, and pile body passes
Sensing system squeezes into the information such as pile end resistance, pile side resistance and pore water pressure for measuring stake.
In above-mentioned technical proposal, the pile body vertical positioning system includes three sets of positioning units, after one is sheathed on pile body
Side, another two sets are divided at left and right sides of pile body, and every set positioning unit includes positioning plate and a horizontal threaded rod, threaded rod one
End is fixed with positioning plate, and the other end passes through rack and tightened in rack two sides by nut；Three pieces of positioning plates are surrounded and are worn for pile body
The hole entered is embedded with ball on each positioning plate.Carrying out clamping to pile body by the positioning plate in three directions may make pile body beating
It keeps vertically squeezing into during entering, and the ball by being embedded on positioning plate can reduce positioning plate and squeeze into bring resistance to stake
Power.By adjusting the effective length of three threaded rods, the size in the hole that adjustable three pieces of positioning plates are surrounded, to meet difference
The test of diameter pile body.
Further, upper plate is stamped in the organic glass case in soil sample, upper plate edge is provided with through-hole and is inserted into for pile body；
The hydraulic loading system includes master cylinder and time oil cylinder, is all set in rack, is driven by servo motor, below master cylinder
It is connected with the pile crown loading end of pile body, secondary oil cylinder lower end is connected with upper plate.All may be used on locating piece or in upper plate bore periphery
To be provided with dial markings, to facilitate the hole size for adjusting three pieces of positioning plates and being surrounded.
Further, the PIV system includes computer, laser emitter, synchronizer, CCD camera, passes through calculating
Machine controls synchronizer and adjusts laser emitter light source, and CCD camera shoots the soil around pile particle during entire pile body is squeezed into
Variation, and photographing information is fed back into computer.
Further, the pile body is that conventional pile body is longitudinal to cuing open along axis, and section has been adjacent to when pile body squeezes into soil sample
Machine glass box.
Soil deformation mistake when observation stake squeezes into process and pile body by circulation vertical load may be implemented in the device of the invention
The variation of soil around pile particle displacement field in journey, formation of shear bands development process and whole process, while can also realize air exercise
Enter stake during burying and pile body is by mechanics parameters a series of under cyclic load such as pile side resistance, end resistance and hole
The acquisition of the data such as gap water pressure.
Detailed description of the invention
Fig. 1 is a kind of overall structure diagram (front elevation) of apparatus of the present invention；
Fig. 2 is a kind of overall structure diagram (left view) of apparatus of the present invention；
Fig. 3 is a kind of overall structure diagram (top view) of apparatus of the present invention；
Fig. 4 is the partial schematic diagram of apparatus of the present invention；
Fig. 5 is the magnified partial view of apparatus of the present invention；
Fig. 6 is the partial schematic diagram of apparatus of the present invention；
Fig. 7 is a kind of structural schematic diagram of PIV system；
Wherein, 1. pile crown loading ends, 2. pile crowns, 3. bending columns, 4. positioning plates, 5. reaction beams, 6. threaded rods, 7. times
Counter-force column, 8. upper plates, 9. organic glass casees, 10. soil samples, 11. pedestals, 12. servo motors, 13. pile bodies, 14. various sensors,
15. ball, 16. axial force sensors, 17. oil cylinders, 18. main counter-force columns, 19. axial force sensors, 20. master cylinders, 21. main counter-forces
Beam, 22. laser emitters, 23. smooth arms, 24. sheet laser transmitters, 25. smooth arm supports, 26.CCD camera, 27. pedestals, 28. are together
Walk device, 29. control cabinets.
Specific embodiment
The experimental provision of stake soil shear action observation and measurement based on PIV technology of the invention, including rack, experiment
The vertical positioning system of case, pile body, hydraulic loading system, pile body sensor-based system, PIV system；
Referring to Fig.1 and 4, rack include time reaction beam 5, it is secondary counter-force column 7, bending column 3, pedestal 11, main reaction beam 21, main
Counter-force column 18；Main counter-force column 18, secondary counter-force column 7 and bending column 3 weld on the base 11, main reaction beam 21, secondary reaction beam 5
It is linked together respectively with main counter-force column 18, secondary counter-force column 7 by screw.
Experimental box includes upper plate 8, large-scale organic glass case 9, which at least has a transparent side wall, just
Accomplish real-time monitoring during being squeezed by PIV system stake and by the change in displacement of soil particle when cyclic load.
Such as Fig. 3-4, the vertical positioning system of pile body includes three sets of positioning units, and every set includes horizontal 6 He of threaded rod
One piece of positioning plate 4, one is set on rear side of pile body, in addition two is set at left and right sides of pile body, and threaded rod 6 passes through bending column
3, there is nut in bending column two sides, for tightening with the position of fixed thread bar 6,6 other end of threaded rod is tightened in positioning plate 4
Upper, ball 15 is embedded in 4 end face of positioning plate, and there is positioning plate used for positioning in 3 directions on horizontal plane, first will be in pile top and pile body
Line alignment is engraved in middle line on glass box in advance, then fixes pile body position with hand, unclamps all nuts, running fix plate 4,
Keep bearing 15 and pile body 13 tangent, tighten all nuts, the vertical positioning of pile body is realized in 4 position of stationary positioned plate.
Hydraulic loading system is set to above cutting system, is answered for applying consolidation stress to the soil body with simulating various soil mass
Furthermore power state is also used for pile body squeezing into the soil body；It mainly passes through the control of servo motor 12 and is mounted on 5 lower section of time reaction beam
Secondary oil cylinder 17 applies pressure by secondary oil cylinder 17, and secondary reaction beam 5 and time counter-force column 7 provide counter-force, be further applied load to upper plate and
The master cylinder 20 for being mounted on main 21 lower section of reaction beam is controlled by servo motor 12, and pressure, main counter-force are applied by master cylinder 20
Beam 21 and main counter-force column 18 provide counter-force, are further applied load to stake.
Pile body sensor-based system may include the axial force sensor 16 being installed on immediately below oil cylinder and be installed on the various of pile body
Sensor 14 (chooses corresponding sensor according to the parameter that experiment needs), and pile body can be by pile crown loading end 1, pile crown 2, pile body
13 compositions, pile crown loading end with pressurizing device for being connected, and stake for being squeezed into soil or being applied to it circulation by pressurizing device
Load, pile body 13 enter soil sample 10 in the case where squeezing into pressure effect, and for simulating, actual driven pile buries and stake is after burying
By the process of cyclic load.
PIV system includes synchronizer 28, laser 22, sheet laser emitter 24, light arm 23, CCD camera 26, control machine
Case 29 etc. controls synchronizer 28 by computer to adjust laser 22, and sheet laser emitter 24 is for beating laser in stake
The part Zhou Tuti enables soil particle to reflect sufficiently strong light, and CCD camera 26 is used to receive the light of soil particle reflection, to soil
Real-time monitoring is accomplished in the variation of particle displacement field, and obtained imaging results are fed back to computer.
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, the vertical positioning system of disassembly pile body and servo loading system open upper plate and fill sand inside glass box
Soil sample covers upper plate and installs vertical positioning system and servo loading system, and control hydraulic loading system applies upper plate pre-
Load makes soil deformation until gradually stable, simulation soil solidifying state；
1. first then the middle line on the middle line alignment glass box in pile top and stake being fixed pile body position with hand, being unclamped
All nuts, running fix plate keep ball tangent with pile body, tighten all nuts, and stationary positioned Board position realizes the perpendicular of pile body
To positioning.
2. opening PIV system, the real-time monitoring that soil particle is displaced during squeezing into stake is realized.
3. by Serve Motor Control master cylinder to stake application squeeze into power or cyclic load, to stake during squeezing into and
The real-time soil particle displacement field that the parameter of each sensor when after squeezing by cyclic load is acquired and obtains to PIV system
Variation is monitored.
After test, careful crop shear case prepares lower battery of tests.
Claims (5)
1. it is a kind of based on PIV technology stake soil shear action observation and measurement experimental provision, which is characterized in that including rack,
Hydraulic loading system, experimental box, PIV system, the vertical positioning system of pile body, pile body sensor-based system；Experimental box includes for containing
The organic glass case of soil sample；Hydraulic loading system is placed in above experimental box, for applying the stress of the initial soil pressure simulation soil body
State, and soil sample is squeezed into for controlling pile body；The vertical positioning system of pile body is for positioning pile body to keep the pile body to be in
Plumbness；Pile body is adjacent to organic glass case side wall surface when squeezing into soil sample, the wall surface is transparent, is beaten by PIV systematic perspective pile
The displacement field variation of soil particle and the formation and development situation of shear band, pile body sensor-based system are beaten for measuring stake during entering
Enter the information such as pile end resistance, pile side resistance and pore water pressure.
2. a kind of experimental provision of stake soil shear action observation and measurement based on PIV technology according to claim 1,
It is characterized in that, the pile body vertical positioning system includes three sets of positioning units, and one is sheathed on rear side of pile body, and another two sets are divided into
At left and right sides of pile body, every set positioning unit includes positioning plate and a horizontal threaded rod, and threaded rod one end is fixed with positioning plate,
The other end passes through rack and is tightened in rack two sides by nut；Three pieces of positioning plates surround the hole penetrated for pile body, each positioning plate
On be embedded with ball.
3. a kind of experimental provision of stake soil shear action observation and measurement based on PIV technology according to claim 1,
It is characterized in that, be stamped upper plate in the organic glass case in soil sample, upper plate edge is provided with through-hole and is inserted into for pile body；The liquid
Pressure loading system includes master cylinder and time oil cylinder, is all set in rack, is driven by servo motor, master cylinder lower section and pile body
Pile crown loading end is connected, and secondary oil cylinder lower end is connected with upper plate.
4. a kind of experimental provision of stake soil shear action observation and measurement based on PIV technology according to claim 1,
It is characterized in that, the PIV system includes computer, laser emitter, synchronizer, CCD camera, is controlled by computer same
It walks device and adjusts laser emitter light source, CCD camera shoots the variation of the soil around pile particle during entire pile body is squeezed into, and will
Photographing information feeds back to computer.
5. a kind of experimental provision of stake soil shear action observation and measurement based on PIV technology according to claim 1,
It is characterized in that, the pile body is that conventional pile body is longitudinal to cuing open along axis, and section is adjacent to organic glass case when pile body squeezes into soil sample.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810779841.5A CN108982265B (en) | 2018-07-16 | 2018-07-16 | Experimental device for pile soil shearing action is observed and is measured based on PIV technique |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810779841.5A CN108982265B (en) | 2018-07-16 | 2018-07-16 | Experimental device for pile soil shearing action is observed and is measured based on PIV technique |
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| CN108982265A true CN108982265A (en) | 2018-12-11 |
| CN108982265B CN108982265B (en) | 2021-03-02 |
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| CN201810779841.5A Active CN108982265B (en) | 2018-07-16 | 2018-07-16 | Experimental device for pile soil shearing action is observed and is measured based on PIV technique |
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| CN114215118A (en) * | 2021-11-05 | 2022-03-22 | 山东电力工程咨询院有限公司 | Tubular pile sinking test device |
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