CN108982264A - A kind of p-y curve measurement mechanism based on the development of soil body shear band - Google Patents
A kind of p-y curve measurement mechanism based on the development of soil body shear band Download PDFInfo
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- CN108982264A CN108982264A CN201810779835.XA CN201810779835A CN108982264A CN 108982264 A CN108982264 A CN 108982264A CN 201810779835 A CN201810779835 A CN 201810779835A CN 108982264 A CN108982264 A CN 108982264A
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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 invention discloses a kind of p-y curve measurement mechanisms, including rack, hydraulic loading system, experimental box, PIV system, sensor-based system etc. based on the development of soil body shear band；Experimental box is the organic glass case for holding the soil body；Hydraulic loading system is placed in above experimental box, is simulated various soil mass stress state for applying consolidation stress to the soil body and is applied horizontal direction cyclic load to pile body；PIV system is used to observe pile body in the displacement field variation and the formation of stake Soil Interface shear band and further development by cyclic load pile week soil particle.Relationship monitoring between Pile side soil body horizontal direction resistance and pile body horizontal loading when stake is acted on by horizontal whirl-sprayed pile may be implemented 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 shaping and development of shear band, pile-soil interaction weakening mechanisms are studied when the present apparatus can combine visual soil deformation to pile body by horizontal whirl-sprayed pile.
Description
Technical field
The present invention relates to a kind of p-y curve measurement mechanisms based on the development of soil body shear band, can be used for measuring stake and are using
The measurement of the p-y curve of formation and development and the stake of soil around pile shear band when in the process by horizontal whirl-sprayed pile is into one
Load transfer mechanism provides an explanation between step discloses stake soil.
Background technique
Offshore wind farm had obtained Devoting Major Efforts To Developing as a kind of clean energy resource in recent years, at present the most common base of wind power foundation
Plinth form is large diameter single pile foundation.Unlike the basis of road, wind-power single-pile foundation is primarily subjected to wind load and wave
The horizontal loadings such as load, it is p-y curve method that engineering, which calculates common method for horizontal loading, at present, is carried out using this method quasi-
It needs to demarcate parameter when really calculating.
A large amount of research existing at present has focused the research of p-y curve, also has devised many model experiments and is studied,
But stake plays the horizontal bearing capacity on basis by the development of shear band after horizontal whirl-sprayed pile and its development
Influence needs further to probe into.Therefore it needs a set of can on the one hand observe stake soil stake week shear band after by horizontal loading
On the other hand measurement stake is provided necessary design parameter by the experimental provision of the p-y curve of horizontal loading for engineering design, together for development
When also visually observation disclose pile foundation level bearing capacity circulation weakening mechanisms.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to which it is bent to provide a kind of p-y based on the development of soil body shear band
Line measuring device, when which can measure pile body p-y curve and load-bearing horizontal to pile body the shear band of soil around pile develop into
Row observation, it is therefore intended that further disclose stake soil power transmission mechanism.The characteristics of device, is: can on the one hand measure stake by water
P-y curve when flat cyclic load, on the other hand, pile peripheral earth shear band when can utilize PIV system to stake by horizontal loading
Development observed in real time, provide evidence for stake soil load transfer mechanism is explained further.
The present invention takes following technical scheme:
A kind of p-y curve measurement mechanism based on the development of soil body shear band, including including rack, hydraulic loading system, experiment
Case, PIV system, sensor-based system；Experimental box is organic glass case for containing soil sample；Hydraulic loading system is used to apply to soil sample
Initial soil pressure is to simulate the concretion state of the soil body, and is used to apply cyclical level load to pile body with simulated wind load or wave
Unrestrained load；PIV system is used to observe the formation and development of pile body soil around pile shear band when by horizontal whirl-sprayed pile, passes
The strain of pile body everywhere when sensing system is used to measure stake by cyclic load.
The rack includes pedestal, main counter-force column, main reaction beam, secondary counter-force column, secondary reaction beam, main counter-force column and time anti-
Power column is fixed vertically, and main counter-force erection is fixed on main counter-force column on the base, and secondary counter-force erection is fixed on secondary anti-vertical
On column, hydraulic loading system includes master cylinder, secondary oil cylinder, and master cylinder is fixedly installed on main reaction beam by reaction frame, with stake
Head connection, for applying horizontal stress to pile crown, secondary oil cylinder is fixedly installed in below time reaction beam；The pile body is conventional stake
Body is longitudinal to half after cuing open along axis, and pile body section is close to experiment chamber interior wall and is squeezed into soil sample, and pile body lower end rests on soil
In sample, upper plate is placed in experimental box soil sample, secondary oil cylinder lower end is connected with upper plate；It is symmetrically mounted in pile body a series of
Foil gauge.
The foil gauge it is vertical between be divided into D, D is pile body diameter.For acquiring to the prefabricating load of soil sample and to stake
The strain of pile body when body is by horizontal loading.
The PIV system includes computer, laser emitter, synchronizer, CCD camera, sheet laser reforming unit, is passed through
Computer controls synchronizer and adjusts laser emitter light source, and light is beaten on the soil body by sheet laser reforming unit, and CCD camera is clapped
The soil around pile particle displacement field variation of entire pile body is taken the photograph, and photographing information is fed back into computer.
Being close to of the pile body and experimental box, vaseline was wiped between face.
The principle on which of the present invention is: uniformly disposing a series of symmetric strained piece (spacing D) along pile body, passes through
Control master cylinder loads on the stress at end to carry out horizontal loading application and (can punish at stake end away from native surface D high and 2D high
Not An Zhuan a displacement meter, an axial force sensor is set between master cylinder and stake end, to judge that applied load is
It is no suitable), actual measurement pile strain is selected in seeking p-y curve, bending value is converted by pile strain value again, by right
Numerical differentiation acquires the native counter-force p along pile body to moment twice, and then acquires the displacement y along pile body；The coefficient of curvature at z-depth
Are as follows:
εt: stretching strain value；
εd: compressive strain value；
D: stake diameter.
By mechanics of materials relevant knowledge:
Mz=EI Φz
Mz: bending at z-depth；E is pile shaft material elasticity modulus, and I is the moment of inertia；
The horizontal resist forces p of stake side can be asked to lead twice by M to z to be acquired:
Use Mz=a+bz+cz2+dz3+ez4+fz5It is fitted Mz- z curve,
Pile body displacement y, which can integrate twice z by M, to be acquired
yz=∫ ∫ Mzdz2
P-Y curve can actually be measured.
Soil deformation, formation of shear bands developed when the device of the invention may be implemented to pile body by horizontal whirl-sprayed pile
The monitoring of soil around pile particle displacement field in journey and whole process, can also obtain p-y of the pile body by horizontal whirl-sprayed pile when
Curve.
Detailed description of the invention
Fig. 1 is shear band simplified model of the present invention；
Fig. 2 is experimental box structural schematic diagram (front elevation) of the invention；
Fig. 3 is overall structure diagram of the invention (side view)；
Fig. 4 is experimental box structural schematic diagram (top view) of the invention；
Fig. 5 is PIV system schematic；
Fig. 6 is experimental box structural schematic diagram (sectional view) of the invention；
Fig. 7 is present invention experiment pile body schematic diagram (top view)；
Wherein, 1. main reaction beams, 2. main counter-force columns, 3.LVDT fixed beam, 4.LVDT, 5. upper plates, 6. foil gauges, 7.
Body, 8. pedestals, 9. control cabinets, 10. soil samples, 11. master cylinders, 12. reaction frames, 13. axial force sensors, 14. reaction beams,
15. time oil cylinder, 16. counter-force columns, 17. axial force sensors, 18. laser emitters, 19. laser stents, 20. synchronizers,
21.CCD camera support, 22.CCD camera, 23. sheet laser reforming units.
Specific embodiment
Referring to Fig. 2-7, a kind of p-y curve measurement mechanism based on the development of soil body shear band of the invention, including rack, liquid
Press loading system, experimental box, PIV system, sensor-based system；
Rack includes pedestal 8, main counter-force column 2, main reaction beam 1, secondary counter-force column 16, secondary reaction beam 14, main counter-force column 2 and time
Counter-force column 16 is fixed on pedestal 8 vertically, and the main erection of reaction beam 1 is fixed on main counter-force column 2, and secondary reaction beam 14, which is set up, to be fixed
In on secondary anti-column 16, hydraulic loading system includes master cylinder 11, secondary oil cylinder 15, and master cylinder is fixedly installed in by reaction frame 12
It on main reaction beam 1, is connect with pile crown, for applying horizontal stress to pile crown, secondary oil cylinder is fixedly installed in 14 lower section of time reaction beam；
The pile body 7 be conventional pile body along axis it is longitudinal to half after cuing open, experimental box is made of organic glass, pile body section is close to
Experiment chamber interior wall is squeezed into soil sample, and pile body lower end rests in soil sample, convenient for during being squeezed by PIV system stake and being followed
The change in displacement of soil particle accomplishes real-time monitoring when ring load.Be placed with upper plate 5 in experimental box soil sample 10, secondary oil cylinder lower end with
Upper plate is connected；A series of foil gauge is symmetrically mounted in pile body.
Hydraulic loading system is set to above experimental box, is mainly passed through the control control of cabinet 9 and is mounted on 12 right side of reaction frame
The master cylinder 11 of side applies pressure by master cylinder 11, and power is reached main reaction beam 1 and passes to main counter-force column 2 again by reaction frame 12, right
Stake applies horizontal direction cyclic reversed loading and controls the secondary oil cylinder 15 for being mounted on 14 lower section of time reaction beam by control cabinet 9,
By secondary oil cylinder 15 to upper plate to apply pressure to the soil body, secondary reaction beam 14 and time counter-force column 16 provide counter-force, apply to the soil body
Add consolidation pressure, simulates the soil body of different concretion states.
Sensor-based system includes the axial force sensor 13 being installed between master cylinder and stake end, is installed below time oil cylinder
Axial force sensor 17 is installed on the foil gauge 6 of pile body and the LVDT4 being installed on the right side of pile crown.
PIV system includes synchronizer 20, laser emitter 18, sheet laser conversion equipment 23, laser stent 19, CCD phase
Machine 22, CCD camera bracket 21 etc. control synchronizer 20 by computer to adjust laser emitter 18, sheet laser conversion equipment
23, for beating laser uniformly in pile peripheral earth part, enable soil particle to reflect sufficiently strong light, CCD camera 22 is for receiving
The light of soil particle reflection accomplishes real-time monitoring to the variation of soil particle displacement field, and obtained imaging results is fed back to calculating
Machine.
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, pile body central axes are directed at glass box axis groove, artificial spud pile is beaten
It opens upper plate and fills sandy soil sample inside glass box, stake is fixed by sandy soil at this time, is kept pile body lower end to be located in the soil body, is covered
Upper plate installs servo loading system, and control hydraulic loading system applies preload to upper plate, makes soil deformation until gradually steady
It is fixed, simulate soil solidifying state；
PIV system is opened, realizes the real-time monitoring being displaced to stake by soil particle in cyclic load.
By Serve Motor Control master cylinder to stake horizontal whirl-sprayed pile, stake is recycled during squeezing into and after squeezing into
The parameter of each sensor when load is acquired and supervises to the real-time soil particle displacement field variation that PIV system obtains
It surveys, and obtains p-y curve.
After test, careful crop shear case prepares lower battery of tests.
Claims (5)
1. a kind of p-y curve measurement mechanism based on the development of soil body shear band, which is characterized in that including including rack, hydraulic loaded
System, experimental box, PIV system, sensor-based system；Experimental box is organic glass case for containing soil sample；Hydraulic loading system is used for
Apply initial soil pressure to soil sample to simulate the concretion state of the soil body, and for applying cyclical level load to pile body to simulate
Wind load or wave load；PIV system for observe pile body when by horizontal whirl-sprayed pile the formation of soil around pile shear band and
Development, the strain of pile body everywhere when sensor-based system is used to measure stake by cyclic load.
2. the p-y curve measurement mechanism according to claim 1 based on the development of soil body shear band, which is characterized in that described
Rack include pedestal (8), main counter-force column (2), main reaction beam (1), secondary counter-force column (16), secondary reaction beam (14), main counter-force column
(2) it is fixed on vertically on pedestal (8) with time counter-force column (16), main reaction beam (1), which sets up, is fixed on main counter-force column (2), secondary
Reaction beam (14) erection is fixed on time anti-column (16), and hydraulic loading system includes master cylinder (11), secondary oil cylinder (15), main oil
Cylinder is fixedly installed on main reaction beam (1) by reaction frame (12), is connect with pile crown, secondary for applying horizontal stress to pile crown
Oil cylinder is fixedly installed in below time reaction beam (14)；It is longitudinal to half after cuing open along axis that the pile body (7) is conventional pile body,
Pile body section is close to experiment chamber interior wall and is squeezed into soil sample, and pile body lower end rests in soil sample, puts on experimental box soil sample (10)
It is equipped with upper plate (5), secondary oil cylinder lower end is connected with upper plate；A series of foil gauge is symmetrically mounted in pile body.
3. the p-y curve measurement mechanism according to claim 1 based on the development of soil body shear band, which is characterized in that described
Foil gauge it is vertical between be divided into D, D is pile body diameter.
4. the p-y curve measurement mechanism according to claim 1 based on the development of soil body shear band, which is characterized in that described
PIV system include computer, laser emitter (18), synchronizer (20), CCD camera (22), sheet laser reforming unit (23),
Laser emitter (19) light source is adjusted by computer control synchronizer (18), light is beaten by sheet laser reforming unit (23)
On the soil body, CCD camera (22) shoots the soil around pile particle displacement field variation of entire pile body, and photographing information is fed back to calculating
Machine.
5. the p-y curve measurement mechanism according to claim 1 based on the development of soil body shear band, which is characterized in that institute
Being close to of the pile body stated and experimental box, vaseline was wiped between face.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810779835.XA CN108982264B (en) | 2018-07-16 | 2018-07-16 | P-y curve measuring device based on soil body shear band development |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810779835.XA CN108982264B (en) | 2018-07-16 | 2018-07-16 | P-y curve measuring device based on soil body shear band development |
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| CN108982264A true CN108982264A (en) | 2018-12-11 |
| CN108982264B CN108982264B (en) | 2020-08-04 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109883822A (en) * | 2019-03-29 | 2019-06-14 | 贵州民族大学 | A kind of horizontal dead load test device and method for CT scan |
| CN110344452A (en) * | 2019-07-16 | 2019-10-18 | 广东工业大学 | A kind of bending measuring device and its measurement 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 |
| CN111141607A (en) * | 2020-01-13 | 2020-05-12 | 北京工业大学 | Self-balancing multi-loading-path unidirectional shearing box for pile-soil test |
| CN112798418A (en) * | 2021-01-29 | 2021-05-14 | 贵州民族大学 | Experimental device for observe and measure stake soil interact of unsaturated soil |
| CN114673205A (en) * | 2022-04-13 | 2022-06-28 | 浙江大学 | Experimental device and method for measuring stiffness characteristic of soil around pile under cyclic load |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104213587A (en) * | 2014-09-26 | 2014-12-17 | 福州大学 | P-Y curve measuring device for pseudo-static test on pile-soil interaction |
| CN104294860A (en) * | 2014-09-26 | 2015-01-21 | 福州大学 | P-Y curve measuring device in pile-soil interaction shaking table test |
| RO130870A2 (en) * | 2014-06-20 | 2016-01-29 | Universitatea Tehnică "Gheorghe Asachi" Din Iaşi | Apparatus for determining mechanical characteristics |
| CN106897554A (en) * | 2017-02-22 | 2017-06-27 | 龙源（北京）风电工程设计咨询有限公司 | A kind of automation computational methods that P Y profiles are carried out based on MATLAB |
| CN108037022A (en) * | 2017-12-19 | 2018-05-15 | 浙江大学 | A kind of stake Soil Interface shearing test device and test method based on picture catching |
| CN207379851U (en) * | 2017-11-11 | 2018-05-18 | 广州环保投资集团有限公司 | Cyclic load load testing machine based on transparent soil model |
-
2018
- 2018-07-16 CN CN201810779835.XA patent/CN108982264B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RO130870A2 (en) * | 2014-06-20 | 2016-01-29 | Universitatea Tehnică "Gheorghe Asachi" Din Iaşi | Apparatus for determining mechanical characteristics |
| CN104213587A (en) * | 2014-09-26 | 2014-12-17 | 福州大学 | P-Y curve measuring device for pseudo-static test on pile-soil interaction |
| CN104294860A (en) * | 2014-09-26 | 2015-01-21 | 福州大学 | P-Y curve measuring device in pile-soil interaction shaking table test |
| CN106897554A (en) * | 2017-02-22 | 2017-06-27 | 龙源（北京）风电工程设计咨询有限公司 | A kind of automation computational methods that P Y profiles are carried out based on MATLAB |
| CN207379851U (en) * | 2017-11-11 | 2018-05-18 | 广州环保投资集团有限公司 | Cyclic load load testing machine based on transparent soil model |
| CN108037022A (en) * | 2017-12-19 | 2018-05-15 | 浙江大学 | A kind of stake Soil Interface shearing test device and test method based on picture catching |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109883822A (en) * | 2019-03-29 | 2019-06-14 | 贵州民族大学 | A kind of horizontal dead load test device and method for CT scan |
| CN109883822B (en) * | 2019-03-29 | 2024-04-02 | 贵州民族大学 | Horizontal static load test device and method for CT scanning |
| CN110344452A (en) * | 2019-07-16 | 2019-10-18 | 广东工业大学 | A kind of bending measuring device and its measurement 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 |
| CN111141607A (en) * | 2020-01-13 | 2020-05-12 | 北京工业大学 | Self-balancing multi-loading-path unidirectional shearing box for pile-soil test |
| CN112798418A (en) * | 2021-01-29 | 2021-05-14 | 贵州民族大学 | Experimental device for observe and measure stake soil interact of unsaturated soil |
| CN114673205A (en) * | 2022-04-13 | 2022-06-28 | 浙江大学 | Experimental device and method for measuring stiffness characteristic of soil around pile under cyclic load |
| CN114673205B (en) * | 2022-04-13 | 2022-12-02 | 浙江大学 | Experimental device and method for measuring stiffness characteristic of soil around pile under cyclic load |
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