CN106284437A - A kind of bucket base vertically initial impedance,motional assay device and test method - Google Patents
A kind of bucket base vertically initial impedance,motional assay device and test method Download PDFInfo
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- CN106284437A CN106284437A CN201610606875.5A CN201610606875A CN106284437A CN 106284437 A CN106284437 A CN 106284437A CN 201610606875 A CN201610606875 A CN 201610606875A CN 106284437 A CN106284437 A CN 106284437A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/10—Miscellaneous comprising sensor means
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Abstract
The invention discloses a kind of bucket base vertically initial impedance,motional assay device and test method, including barrel base, blower fan pylon, mass, extended thrust bar, low frequency electromagnetic vibrator, vibrator fixed mount, force transducer, Flange joint dish, soil pressure sensor, pore water pressure sensor, acceleration transducer, foil gauge, Energy dissipating material, drain pipe, test ferrum case, angle steel rib, steel plate ribbed stiffener, loading frame, power amplifier, swept signal generator, dynamic collecting instrument, computer.This device is made up of load loading section and barrel base part, to realize vertical dynamic stiffness and the measurement of vertical dynamic damping.Utilize low frequency vibration exciter to load, calculate to obtain the dynamic stiffness of bucket base by measuring active force and the displacement of the soil body.By applying vertical initial displacement at mass, measure attenuation curve and try to achieve the dynamic damping of barrel base.The present invention can study vertical initial impedance,motional and the influence factor thereof of barrel base exactly, lays the first stone for research further.
Description
Technical field
The invention belongs to offshore wind turbine technical field of power generation, particularly relate to the vertically just initiating resistance of a kind of bucket base
Anti-assay device and test method.
Background technology
Along with the non-renewable energy resources such as coal, oil day by day reduce, and fossil energy uses the environmental problem brought
Becoming increasingly conspicuous, a lot of countries start to try to explore and develop regenerative resource.As the representative of regenerative resource, wind energy on the sea because of
It has economize the land resource, wind energy steadily, noiselessness, the feature such as pollution-free become new energy development research emphasis.
It is basic much larger than Common Pile basis and suction anchor that the super-large diameter Thin-wall Barrel base of offshore wind turbine is generally referred to as diameter,
The tens of rice of diameter (maximum has reached 30m), and the barrel base that the radius-thickness ratio of bucket basal wall thickness is much smaller than 0.1.Such as 2002
In the Frederikshavn wind energy turbine set of Denmark, employ diameter 12m first, the barrel-shaped base of super-large diameter thin-walled of radius-thickness ratio 0.002
Plinth.Develop the continuous increase of the met depth of water in particular with offshore wind farm, develop from offshore oil platform jacket structure
, adapt to the depth of water is wider, bearing capacity is bigger spider and the basic base being the most constantly applied to blower fan of four foot catheterostats
In plinth, suction bucket basis forms multi-barrel base as each " foot " of these " polypody " supporting constructions, by reverse vertical anti-
Power opposing overturning moment.
For deep-sea floating blower fan and the blower fan of multi-barrel base, blower fan when actual motion, superstructure by wind, wave,
The effect of the lateral loads such as stream, seismic wave, final external loads is delivered on barrel base with the form of vertical cyclic load, these rings
The frequency of border load and the blower fan natural frequency of vibration very close to, be easily caused blower fan and occur resonance to destroy.In addition, easily attractive wind
The load of machine mesomerism results from the rotation of fan blade, and rotation can produce the load of two kinds of frequencies: 1. eccentric load, due to
The barycenter of turbine and blade often has certain skew (deformable blade also can produce centroid motion) with rotating shaft, and wind wheel rotates meeting
Producing eccentric force, its frequency is equal with rotational frequency, claims 1P frequency；2. in blade rotation process, owing to blade face gravity causes
Load, with wind wheel cycle of rotation apply.The frequency of this load is the rotational frequency that the number of blade is multiplied by wind wheel, three general blades
The cross-over frequency of blower fan is referred to as 3P frequency.In order to avoid resonating, engineering design needs make blower fan structure overall first
The rank natural frequency of vibration avoids 1P frequency, 3P frequency and the frequency of external environment condition load.Simultaneously in order to ensure safety, DNV(DNV-DET
NORSKE VERITAS, Norske Veritas) code requirement degree of safety of reserved 10% on 1P and 3P frequency band.So it is available for blower fan
The frequency band of safe operation is the narrowest.Therefore blower fan is to ensure in the accurately research of properly functioning period self-vibration characteristic
Blower fan is the key of safe operation during normal use, is even referred to as the part of most critical by some scholar.
According to multi-Degree-of Freedom Linear Systems vibration equation in high Structural Dynamics, the vibration performance of structure depends on effect
External force, the quality of structure, rigidity and damping structurally.Particularly calculating deep-sea floating blower fan and coastal waters multi-barrel base
During offshore wind turbine self-vibration characteristic, the mainly vertical load that bucket base is subject to, the vertical impedance,motional on basis self-vibration characteristic is had to
Close important impact.
At present when fan design, under normal operating condition, the vertical impedance,motional of bucket base the most randomly can depend on, and general is
Obtain vertical Static stiffness by test, or use API(American Petroleum Institute American Petroleum Institute)
And the T-Z curve that DNV specification is recommended carries out approximate calculation.Owing to Static stiffness obtains under dead load effect, and T-Z curve
Then obtained by elongated pile foundation static(al) Ultimate Strength Test, therefore the most smart by the most calculated result
Really.Simultaneously properly functioning along with blower fan, the circulation of external loads applies, and the impedance,motional of bucket base there will be change, the self-vibration of blower fan
Frequency also changes.There are the natural frequency of vibration of barrel base blower fan under scholar's research cyclic load and the change rule of system damping
Rule, but for can accurately obtain a barrel base impedance,motional, it is still necessary to the mechanism of production of further investigation bucket base impedance,motional and influence factor.
Summary of the invention
The problem existed for prior art, the present invention provides a kind of bucket base vertically initial impedance,motional assay device and test
Method.By this assay device and test method, vertical initial impedance,motional and the influence factor thereof of barrel base can be studied exactly.
This device utilizes the low frequency electromagnetic vibrator on loading frame that bucket base (i.e. barrel base) carries out accurate low frequency, low
The loading of load, accurately calculates to obtain bucket base and the active force of the soil body by pressure transducer and foil gauge, passes through acceleration transducer
Calculate to obtain the displacement of the soil body, be finally calculated the dynamic stiffness of the soil body.Remove loading frame, in barrel base part, at top quality
Block applies a vertical initial displacement or initial acceleration, is recorded the attenuation curve of free vibration by acceleration transducer,
Calculate the dynamic damping trying to achieve barrel base.By soil pressure sensor and pore water pressure sensor, research soil pressure and pore water pressure
Impact on initial impedance,motional
The technical solution used in the present invention is as follows, and a kind of bucket base vertically initial impedance,motional assay device, including test ferrum case and bucket
Shape basis；Sand centre in the bottom penetration test ferrum case of described barrel base；Blower fan pylon is fixed by Flange joint dish
Above barrel base, mass is fixed on the top of wind tower crane frame；Low frequency electromagnetic vibrator is fixed on vibrator frame, exciting
Device frame is fixed on loading frame, and loading frame is nested in test ferrum case sidewall upper；The lower end of low frequency electromagnetic vibrator is connected to prolong
Stretching distance rod, force transducer is fixed between extended thrust bar and mass；Foil gauge is posted outside the bucket wall of barrel base,
Soil pressure sensor be arranged in bottom barrel base with on the contact surface of the soil body, the axis of the barrel base below barrel base
On line, around the bucket wall both sides of barrel base and barrel base lateral wall, all it is disposed with pore water pressure sensor；Acceleration
Sensor is fixed on the top cover of barrel base, the both sides of the top cover being fixed on barrel base that acceleration transducer is symmetrical, can
To obtain the vertical displacement of barrel base accurately.Low frequency electromagnetic vibrator and power amplifier connect, power amplifier and frequency sweep letter
Number generator connects；Foil gauge, soil pressure sensor, pore water pressure sensor, acceleration transducer and force transducer are the most logical
Crossing data wire and dynamic collecting instrument connects, dynamic collecting instrument and computer connect.
Being fixed with one layer of Energy dissipating material on the inwall of test ferrum case, during energy good absorption cyclic load, the soil body produces
The boundary wave that raw stress wave and the soil body-seawater interface produce, makes result of the test more accurate.Drainage arrangement is fixed on test ferrum
On the Energy dissipating material in bottom portion, drainage arrangement is some drain pipies, and arranges rubble and geotextiles, composition at drain pipe periphery
Drainage system, adds water and draining in proof box, make the soil body be easier to consolidation, saturated.From bottom discharge pipe from test ferrum case
Corner extends to test outside ferrum case, and described Energy dissipating material is porous foam.
The stability of precision Yu device in order to improve test, low frequency electromagnetic vibrator, mass, blower fan pylon and bucket
The axis on shape basis overlaps.
Test ferrum case is formed by Plate Welding, and antirust treatment of going forward side by side is the most perishable, and ferrum case outer surface is along ferrum case
Length direction is welded with angle steel rib, improves the bearing capacity of test ferrum case.Loading frame both sides there also is provided steel plate ribbed stiffener simultaneously,
Can prevent loading frame from occurring toppling.
Test method based on aforesaid a kind of barrel of base vertically initial impedance,motional assay device, including the vertical dynamic stiffness of barrel base
Test and the vertical dynamic damping of bucket base are tested；
First carry out the test of barrel base vertical dynamic stiffness, comprise the steps:
Sea water first it is added without in test ferrum case；
A1) padding gravel around drain pipe, gravel top layer overlay geotechnique weave cotton cloth, and prevents sand to run off from drain pipe；
A2) after sand consolidates, at the top cover of the barrel base of diameter 0.3m, acceleration transducer is fixed, and by barrel-shaped
Basis penetration test ferrum case centre sand installation put in place, treat that the soil body completes super quiet pore pressure dissipation；
A3) loading frame is nested on test ferrum case, then utilizes vibrator fixed mount that low frequency electromagnetic vibrator is fixed, adjust
Whole loading frame position and the height of low frequency electromagnetic vibrator, make the axis of electromagnetic exciter and barrel base overlap, and prolonging
Stretch and between distance rod and mass, fix force transducer；
A4) apply vertically to circulate exciting force at barrel base top by low frequency electromagnetic vibrator, treat that barrel base response is stable
Rear record barrel base and the response data of surrounding soil；
A5) frequency of Simple Harmonic Load, repeated several times step A4 are changed) several times, and record data；
A6) treat without step A1 in the case of sea water)-A5) bucket base vertical dynamic stiffness testing experiment complete after, test ferrum case in
Addition sea water, with simulating ocean environment, stands a period of time saturated to the soil body, repeats step A1)-A4), have sea condition condition to obtain
Lower bucket base vertical dynamic stiffness test value；
A7) will pull out on barrel base, make the top board of barrel base separate with the soil body but barrel base not exclusively extracting, i.e. bucket wall
Still be inserted in the soil body, until soil solidifying a period of time until on pull out after the soil disturbance that causes recovers and surpass pore pressure dissipation, weight
Have step A4 under sea state again)-A5), record the vertical initial dynamic stiffness of barrel base bucket wall；
A8), after being extracted completely by barrel base, the barrel base of diameter 0.3m is pulled down the disk basis changing a diameter of 0.3m,
After consolidation certain time, disk basis is applied vertical harmonic excitation load, after base response is stable, recording disc basis
Response, record the vertical initial dynamic stiffness on disk basis；
A9) remove disk basis, the barrel base of a diameter of 0.1m be installed, after soil solidifying a period of time, with reference to A4)-
A5) method of step, records vertical initial dynamic stiffness and the soil body dynamic response of the barrel base of diameter 0.1m；
A10) pull down the barrel base of a diameter of 0.1m, change the barrel base of diameter 0.5m, treat soil solidifying certain time
After, with reference to A4)-A5) method of step, record dynamic stiffness and the soil body dynamic response of the barrel base of diameter 0.5m, so far bucket
Base vertical dynamic stiffness off-test；
After the test of barrel base vertical dynamic stiffness is finished, carry out the test of barrel base vertical dynamic damping, dynamic damping experiment process and dynamic stiffness
Experiment process is the same, and difference is in step A4) in dynamic stiffness test apply outside vertical cyclic load at barrel base top,
And dynamic damping test applies an initial displacement or acceleration at barrel base top, then allow barrel base free vibration, logical
Cross acceleration transducer and record the attenuation curve of free vibration, calculate the damping trying to achieve barrel base.
Beneficial effects of the present invention:
1. this assay device can measure soil pressure, pore water pressure simultaneously.Can record when cyclic load, bucket primitive period encloses
The dynamic response of the soil body, and the accumulation of pore water pressure and dissipation situation, reflect that soil pressure and pore water pressure erect with bucket base
To the relation of impedance,motional.
2. this assay device all posts foil gauge in barrel base bucket wall both sides, by recording the value of foil gauge, it is possible to meter
Calculate the small strain of barrel wall, calculate the internal force on barrel wall cross section.Between mass and extended thrust bar, force transducer is installed,
Can record acts on the size of exciting force on barrel base.By exciting force and the calculating of bucket wall internal force, it is thus possible to more accurate
Calculate the interaction force of effect barrel base and the soil body.
3. inside the test ferrum case of this assay device, it is fixed with the Energy dissipating material of one layer of porous foam, it is thus possible to good absorption
During cyclic load, the boundary wave that the stress wave of soil body generation and the soil body-seawater interface produce, make result of the test more smart
Really.
4. this assay device fixes acceleration transducer in barrel base top lateral symmetry, by acceleration is carried out two
Secondary integration, can be accurately obtained a barrel base vertical displacement.Utilize the displacement difference that two acceleration transducers obtain simultaneously, can be with inverse
Go out the inclination angle of barrel base, check whether bucket base tilts.
5. this assay device is provided with some drain pipies in test ferrum bottom portion, and arranges rubble and soil at drain pipe periphery
Work cloth, forms drainage system.Add water and draining in proof box from bottom discharge pipe, make the soil body be easier to consolidation, saturated.
6. the test ferrum case of this assay device is formed by Plate Welding, and antirust treatment of going forward side by side is difficult to corrosion.And ferrum case
Outer surface is welded with angle steel rib along ferrum case length direction, preferably improves the bearing capacity of test ferrum case.Loading frame both sides are also simultaneously
It is disposed with steel plate ribbed stiffener, can prevent loading frame from occurring toppling.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to
Other accompanying drawing is obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the front view testing ferrum case in the present invention；
Fig. 3 is the left view testing ferrum case in the present invention；
Fig. 4 is the top view testing ferrum case in the present invention；
Fig. 5 is the front view of loading frame in the present invention；
Fig. 6 is the left view of loading frame in the present invention；
Fig. 7 is the top view of loading frame in the present invention；
Fig. 8 is the front view of barrel base in the present invention；
Fig. 9 is the front view on disk basis in the present invention；
In figure, 1-barrel base, 2-blower fan pylon, 3-mass, 4-extended thrust bar, 5-low frequency electromagnetic vibrator, 6-exciting
Device fixed mount, 7-force transducer, 8-Flange joint dish, 9-soil pressure sensor, 10-pore water pressure sensor, 11-acceleration
Sensor, 12-foil gauge, 13-Energy dissipating material, 14-drain pipe, 15-test ferrum case, 16-sand, 17-sea water, 18-angle steel rib
Bar, 19-steel plate ribbed stiffener, 20-loading frame, 21-power amplifier, 22-swept signal generator, 23-dynamic collecting instrument, 24-
Computer.
Detailed description of the invention
Below in conjunction with the accompanying drawings the preferred embodiments of the present invention are described in detail, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, thus protection scope of the present invention is made apparent clear and definite defining.
As shown in Fig. 1-Fig. 9, the one of the present invention is for the vertically initial impedance,motional test of super-large diameter thin-walled barrel base
Device, including barrel base 1, blower fan pylon 2, mass 3, extended thrust bar 4, low frequency electromagnetic vibrator 5, vibrator fixed mount
6, force transducer 7, Flange joint dish 8, soil pressure sensor 9, pore water pressure sensor 10, acceleration transducer 11, strain
Sheet 12, Energy dissipating material 13, drain pipe 14, test ferrum case 15, sand 16, sea water 17, angle steel rib 18, steel plate ribbed stiffener 19, add
Carrier 20, power amplifier 21, swept signal generator 22, dynamic collecting instrument 23, computer 24.Test ferrum case 15 is internal fixing
Living one layer of Energy dissipating material 13, drain pipe 14 is fixed on Energy dissipating material 13 upper surface；Appropriate meeting is loaded in test ferrum case 15
The sand 16 of test requirements document and sea water 17；Barrel base 1 is injection sand 16 by the way of gravity and evacuation form negative pressure
Centre；Blower fan pylon 2 is fixed on above barrel base basis by Flange joint dish 8, and blower fan pylon 2 and mass 3 utilize location
Screw is fixed together；Low frequency electromagnetic vibrator 5 is fixed on vibrator fixed mount 6, and vibrator fixed mount 6 is by screw and draws
Bar is fixed on the correct position on loading frame 20, and vibrator front end is connected to extended thrust bar 4, and force transducer 7 is by location spiral shell
Silk is fixed between distance rod and mass 3, low frequency electromagnetic vibrator 5, mass 3, blower fan pylon 2 and the axis of barrel base 1
Line is on same vertical straight line；Loading frame 20 is nested on test ferrum case 15 wall by angle steel bottom loading frame, utilizes screw solid
Determine to live.Foil gauge 12 is attached to outside in the bucket wall middle of barrel base 1, and soil pressure sensor 9 is arranged in bottom barrel base 1
With on the contact surface of the soil body, pore water pressure sensor 10 is arranged in below barrel base axis, outside bucket wall both sides and bucket base suitably
Distance, acceleration transducer 11 is fixed on barrel base 1 top header both sides；Low frequency electromagnetic vibrator 5 passes through data wire
Connect with power amplifier 21, swept signal generator 22, carry out the control of exciting force size and frequency；Foil gauge 12, soil pressure
Force transducer 9, pore water pressure sensor 10, acceleration transducer 11 and force transducer 7 are all by data wire and dynamic acquisition
Instrument 23 connects, and dynamic collecting instrument 23 and computer 24 connect, and carry out data acquisition.
Test ferrum case 15 a size of: 2m × 2m × 1.5m(length × width × height).According to similarity criterion, close sand is contracted
Chi, sand 16 particle diameter is taken as 0.3mm ~ 0.4mm.
This assay device has five kinds of sensors, is all connected with dynamic collecting instrument 23, carries out during cyclic load applies
Dynamically recording.Force transducer 7 is for measuring the size of the exciting force that low frequency vibration exciter is applied.Acceleration transducer 11 is used for surveying
The size of acceleration during amount barrel base 1 is whole, by measuring Acceleration time course, then passes through twice integration and obtains displacement
Time-histories, obtains displacement during minimum strain, finally by both sides, barrel base 1 top displacement difference inverse barrel base 1 corner.Soil
Pressure transducer 9 and pore water pressure sensor 10 are for measuring a barrel dynamic response for base surrounding soil, and pore water pressure
Accumulation and dissipation situation, reflect the relation of soil pressure and pore water pressure and the vertical impedance,motional of bucket base.Foil gauge 12 is used for surveying
The small strain of measuring tank wall, thus calculate the internal force on barrel wall cross section, is counted jointly by the exciting force recorded with force transducer 7
Calculate, it is thus possible to calculate the interaction force of effect barrel base 1 and the soil body more accurately.
This assay device can carry out having sea water 17 and the vertical impedance,motional of barrel base 1 without sea water 17 to test respectively, passes through
The two contrast, can study the sea water 17 impact on vertical impedance,motional.
This assay device can carry out the vertical impedance,motional test on barrel base 1, bucket wall and disk basis, contrast respectively
The vertical impedance,motional of barrel base 1 different piece, can obtain barrel base 1 different piece provides the ratio of impedance,motional, research
Barrel base 1 provides the mechanism of impedance,motional.
This assay device can carry out the test of various sizes of barrel base 1 impedance,motional.By a diameter of 12m, the bucket of a height of 6m
Base carries out reduced scale, and bucket base draw ratio is 1.0, and wall thickness diameter is than location 0.005, and 3 bucket bases are respectively 1:120,1:40 than chi
And 1:24, its diameter this diameter of respectively 0.1m, 0.3m and 0.5m(is the barreled diameter of movement that below barrel base, thin-walled surrounds),
Bucket sill is steel.Thus study the impact of scale effect impedance,motional vertical on barrel base 1.
The vertical initial impedance,motional assay device of this super-large diameter thin-walled barrel base 1 and test method, it may include two parts
Test: the test of bucket base vertical dynamic stiffness and the vertical dynamic damping of bucket base are tested.Bucket base vertical dynamic stiffness test follows these steps to carry out:
(1) bottom test ferrum case 15, arrange the drainage system of drain pipe 14 composition, drain pipe 14 is beaten at a certain distance
Upper osculum, the around upper gravel of pad, gravel top layer overlay geotechnique weave cotton cloth, and prevents sand 16 to run off from drain pipe 14.Then
Above geotechnique weaves cotton cloth, sand 16 is inserted in layering, after sand 16 is backfilling into certain altitude, places correspondence in corresponding position
Sensor.Until sand 16 is backfilling into test desired height.Sand 16 is flooded toward adding water to the water surface in proof box from drain pipe 14.
After sand 16 is saturated, water is discharged from drain pipe 14, anhydrous to sand 16 surface, treat that sand 16 consolidates.
(2) after sand 16 consolidation, at barrel base top cover, acceleration transducer 11 is fixed, by crossing gravity and taking out true
The barrel base 1 of diameter 0.3m is installed to specifying position by the empty negative pressure that formed, and treats that the soil body completes super quiet pore pressure dissipation, then tries
Test.
(3) loading frame 20 is nested on test ferrum case 15, then utilizing 6 low frequency electromagnetic excitings of vibrator fixed mount
Device 5 is fixed on certain altitude.Adjust loading frame 20 position and the height of low frequency vibration exciter, make vibrator and barrel base 1 exist
On same straight line, and between extended thrust bar 4 and mass 3, fix force transducer 7.
(4) check that various kinds of sensors and signal amplifier and data collecting system are the most normal the most simultaneously.Then
Apply vertically to circulate exciting force at barrel base 1 top by low frequency electromagnetic vibrator 5, after certain time, treat barrel base 1 sound
Response (exciting force and acceleration responsive, ladle body strain, resistance to shear of soil, the hole of barrel base 1 and surrounding soil should be recorded after stablizing
Pressure etc.).After having recorded, change the frequency of Simple Harmonic Load, be repeatedly similar to test, and record data.
(5), after the vertical dynamic stiffness testing experiment of barrel base 1 in the case for the treatment of without sea water 17 completes, barrel base 1 is not
With extracting, in test ferrum case 15, add water to certain depth, with simulating ocean environment, after standing a period of time, repeat without sea water
Barrel base 1 dynamic stiffness testing experiment in the case of 17, in the case of having sea water 17 with acquisition, the vertical dynamic stiffness of barrel base 1 is tested
Value；
(6) will pull out on barrel base 1, make barrel base 1 top board leave sea bed, but and not exclusively extract, consolidation a period of time treats
On pull out after the soil disturbance that causes recovers and surpass pore pressure dissipation, carry out load test shown in (4th) step, record barrel base 1 barrel
The vertical initial dynamic stiffness of wall；
(7), after being extracted completely by barrel base, position is being specified on the rigid disc basis installing a diameter of 0.3m, consolidation one timing
After between.Disk basis is applied vertical harmonic excitation load, after disk base response is stable, the sound on recording disc basis
Should, record the vertical initial dynamic stiffness on disk basis；
(8) remove disk basis, the barrel base 1 of a diameter of 0.1m is installed, after estimating a period of time, with reference to the side of (4th) step
Method, records vertical initial dynamic stiffness and the soil body dynamic response of diameter 0.1m barrel base 1
(9) remove the barrel base 1 of a diameter of 0.1m, change the barrel base 1 of a diameter of 0.5m, after consolidation certain time, ginseng
According to the method for (4th) step, record dynamic stiffness and the soil body dynamic response of 0.5m barrel base 1.So far dynamic stiffness model test knot
Bundle.
After off-test, test procedure (4) step (5) measurement result is contrasted, analyze sea water 17 vertical to barrel base 1
The Influencing Mechanism of initial dynamic stiffness；Test procedure (6)+(7) measurement result and step (5) measurement result are contrasted, analyzes barrel-shaped
Basis 1 different piece provides the relation of initial stiffness；The result that thing test procedure (5), (8) and (9) draws is carried out dimensionless
Change, contrast, analyze the conclusion drawn in model test and than chi test and obtain by measuring true offshore wind turbine inverse greatly
To prototype barrel base dynamic stiffness value, to analyze the dimensional effect impact on dimensionless dynamic stiffness.
Bucket base vertically initial dynamic stiffness is tested after finishing, and carries out the vertically initial dynamic damping test of barrel base.Dynamic damping test stream
Journey is the same with dynamic stiffness experiment process, and difference is that dynamic stiffness test applies outside vertical cyclic load at barrel base 1 top,
And dynamic damping test applies an initial displacement or acceleration at barrel base 1 top, then allow barrel base 1 free vibration,
Recorded the attenuation curve of free vibration by acceleration transducer, calculate the damping trying to achieve barrel base 1.
By this assay device and test method, the factor affecting bucket base initial impedance,motional characteristic, Jin Ershen can be studied
Enter to disclose bucket base and sea water, the mechanism of sea bed dynamic interaction.Simultaneously initial to bucket base dimensionless by inquiring into scale effect
The impact of impedance,motional, proposes reasonable proposal for the bucket base initial impedance,motional value in Practical Project, and to China's sea turn from now on
The design of machine and construction provide the theory and technology suggestion of certain guidance.
The above, the only detailed description of the invention of the present invention, but protection scope of the present invention is not limited thereto, and any
The change expected without creative work or replacement, all should contain within protection scope of the present invention.
Claims (10)
1. a bucket base vertically initial impedance,motional assay device, it is characterised in that: include testing ferrum case (15) and barrel base
(1)；Test ferrum case (15) interior sand (16) centre is inserted in the bottom of described barrel base (1)；Blower fan pylon (2) passes through flange
Connection dish (8) is fixed on barrel base (1) top, and mass (3) is fixed on the top of wind tower crane frame (2)；Low frequency electromagnetic exciting
Device (5) is fixed on vibrator frame (6), and vibrator frame (6) is fixed on loading frame (20), and loading frame (20) is nested in test ferrum
Case (15) sidewall upper；The lower end of low frequency electromagnetic vibrator (5) is connected to extended thrust bar (4), and force transducer (7) is fixed on and prolongs
Stretch between distance rod (4) and mass (3)；Foil gauge (12), soil pressure sensor is posted outside the bucket wall of barrel base (1)
(9) it is arranged on the contact surface of barrel base (1) bottom and the soil body, at the axis of the barrel base (1) of barrel base (1) lower section
On line, around the bucket wall both sides of barrel base (1) and barrel base (1) lateral wall, all it is disposed with pore water pressure sensor
(10)；Acceleration transducer (11) is fixed on the top cover of barrel base (1), low frequency electromagnetic vibrator (5) and power amplifier
(21) connecting, power amplifier (21) and swept signal generator (22) connect；Foil gauge (12), soil pressure sensor (9), hole
Gap water pressure sensor (10), acceleration transducer (11) and force transducer (7) are all by data wire and dynamic collecting instrument (23)
Connecting, dynamic collecting instrument (23) and computer (24) connect.
A kind of bucket base the most according to claim 1 vertically initial impedance,motional assay device, it is characterised in that: at test ferrum case
(15) bottom is additionally provided with drainage arrangement.
A kind of bucket base the most according to claim 1 vertically initial impedance,motional assay device, it is characterised in that: low frequency electromagnetic swashs
Shake device (5), mass (3), blower fan pylon (2) and barrel base (1) axis overlap.
A kind of bucket base the most according to claim 1 vertically initial impedance,motional assay device, it is characterised in that: described test ferrum
The inwall of case (15) is fixed with Energy dissipating material (13).
A kind of bucket base the most according to claim 2 vertically initial impedance,motional assay device, it is characterised in that: described draining fills
Putting and include some drain pipies (14), it is outside that drain pipe (14) extends to test ferrum case (15) from the corner of test ferrum case (15).
A kind of bucket base the most according to claim 4 vertically initial impedance,motional assay device, it is characterised in that: described power consumption material
Material (13) is porous foam.
A kind of bucket base the most according to claim 1 vertically initial impedance,motional assay device, it is characterised in that: described test ferrum
Case (15) is formed by Plate Welding, and carries out antirust treatment.
A kind of bucket base the most according to claim 1 vertically initial impedance,motional assay device, it is characterised in that: described acceleration
The both sides of the top cover being fixed on barrel base (1) that sensor (11) is symmetrical.
A kind of bucket base the most according to claim 1 vertically initial impedance,motional assay device, it is characterised in that: test ferrum case leads to
Cross Plate Welding to form, antirust treatment of going forward side by side, and ferrum case outer surface is welded with angle steel rib (18) along ferrum case length direction, with
Time loading frame (20) both sides there also is provided steel plate ribbed stiffener (19).
10. test method based on the vertically initial impedance,motional assay device of a kind of barrel of base described in claim 1-8, its feature exists
In, test including the test of barrel base vertical dynamic stiffness and the vertical dynamic damping of bucket base；
First carry out the test of barrel base vertical dynamic stiffness, comprise the steps:
Sea water first it is added without in test ferrum case (15)；
A1) the upper gravel of pad around drain pipe (14), gravel top layer overlay geotechnique weave cotton cloth, and prevents sand (16) from drain pipe
(14) run off；
A2) after sand (16) consolidates, at the top cover of the barrel base (1) of diameter 0.3m, acceleration transducer is fixed
(11), and barrel base (1) penetration test ferrum case (15) centre sand installation are put in place, treat that the soil body completes super quiet pore pressure and disappears
Dissipate；
A3) loading frame (20) is nested in test ferrum case (15), then utilizes vibrator fixed mount (6) that low frequency electromagnetic is swashed
The device (5) that shakes is fixed, and adjusts loading frame (20) position and the height of low frequency electromagnetic vibrator (5), makes electromagnetic exciter (5) and barrel-shaped
The axis on basis (1) overlaps, and fixes force transducer (7) between extended thrust bar (4) and mass (3)；
A4) apply vertically to circulate exciting force at barrel base (1) top by low frequency electromagnetic vibrator (5), treat barrel base (1)
Barrel base (1) and the response data of surrounding soil is recorded after response is stable；
A5) frequency of Simple Harmonic Load, repeated several times step A4 are changed) several times, and record data；
A6) treat without step A1 in the case of sea water (17))-A5) bucket base vertical dynamic stiffness testing experiment complete after, test ferrum
In case (15), addition sea water is with simulating ocean environment, stands a period of time saturated to the soil body, repeats step A1)-A4), to obtain
There is bucket base vertical dynamic stiffness test value in the case of sea water (17)；
A7) will pull out on barrel base (1), make the top board of barrel base (1) separate with the soil body but barrel base (1) not exclusively pulling out
Go out, until soil solidifying a period of time until on pull out after the soil disturbance that causes recovers and surpass pore pressure dissipation, repeat there is sea state
Under step A4)-A5), record the vertical initial dynamic stiffness of barrel base (1) bucket wall；
A8), after being extracted completely by barrel base (1), the barrel base (1) of diameter 0.3m is pulled down the circle changing a diameter of 0.3m
Dish basis, after consolidation certain time, applies vertical harmonic excitation load to disk basis (1), after base response is stable, and note
The response of record disk basis (1), records the vertical initial dynamic stiffness of disk basis (1)；
A9) remove disk basis, the barrel base (1) of a diameter of 0.1m is installed, after soil solidifying a period of time, with reference to the
A4)-A5) method of step, record vertical initial dynamic stiffness and the soil body dynamic response of the barrel base (1) of diameter 0.1m；
A10) pull down the barrel base (1) of a diameter of 0.1m, change the barrel base (1) of diameter 0.5m, treat that soil solidifying is certain
After time, with reference to A4)-A5) method of step, record dynamic stiffness and the soil body dynamic response of the barrel base (1) of diameter 0.5m,
So far bucket base vertical dynamic stiffness off-test；
After the test of barrel base vertical dynamic stiffness is finished, carry out the test of barrel base vertical dynamic damping, dynamic damping experiment process and dynamic stiffness
Experiment process is the same, and difference is in step A4) in dynamic stiffness test apply at barrel base (1) top outside vertically to circulate lotus
Carry, and dynamic damping test applies an initial displacement or acceleration at barrel base (1) top, then allow barrel base (1) certainly
By vibrating, recorded the attenuation curve of free vibration by acceleration transducer, calculate the damping trying to achieve barrel base (1).
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| CN108562354A (en) * | 2018-01-17 | 2018-09-21 | 河海大学 | A kind of geotechnical model slot can be used for reducing stress wave reflection |
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| CN111650120A (en) * | 2020-07-09 | 2020-09-11 | 青岛理工大学 | Sand water bottom sediment dynamic response test system |
| CN114218653A (en) * | 2021-12-20 | 2022-03-22 | 中铁大桥局集团第五工程有限公司 | Method for calculating bearing capacity of suction pile foundation of offshore construction platform |
| CN114218653B (en) * | 2021-12-20 | 2023-10-20 | 中铁大桥局集团第五工程有限公司 | Offshore construction platform suction pile foundation bearing capacity calculation method |
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