CN208705213U - Micromachine shaketalle test device suitable for weak Sand Liquefaction Analysis - Google Patents
Micromachine shaketalle test device suitable for weak Sand Liquefaction Analysis Download PDFInfo
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- CN208705213U CN208705213U CN201821435407.7U CN201821435407U CN208705213U CN 208705213 U CN208705213 U CN 208705213U CN 201821435407 U CN201821435407 U CN 201821435407U CN 208705213 U CN208705213 U CN 208705213U
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- shake table
- micromachine
- test device
- dynamical system
- sand liquefaction
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Abstract
The utility model discloses the micromachine shaketalle test devices for being suitable for weak Sand Liquefaction Analysis, solving the prior art, there are experimentation cost height, sand liquefaction cause foundation structure unstable failure can not quicklook obtain the problem of, with experimental study cost is saved, the technological means of weak Sand Liquefaction Analysis is extended；Its scheme is as follows: the micromachine shaketalle test device suitable for weak Sand Liquefaction Analysis, including controller, controller is connect with dynamical system, dynamical system is connect with the shake table for sample to be arranged, controller is connect with input part, the frequency that dynamical system is controlled by input part is calculated the thrust of shake table by controller.
Description
Technical field
The utility model relates to geotechnical engineering machinery fields, more particularly to suitable for the miniature of weak Sand Liquefaction Analysis
Mechanical vibration generator system experimental rig.
Background technique
Sand liquefaction refers to the phenomenon that loose powder of full water, fine sand soil destroy suddenly under effect of vibration and liquid are presented,
Since pore water pressure rises, effective stress reduces variation phenomenon of the caused sand from solid-state to liquid.Its mechanism is full
Loose powder, the fine sand soil body of sum have the tendency that particle is mobile and it is close to become under effect of vibration, to the receiving of stress from sand skeleton
Water is turned to, since the penetration of powder and fine sand soil is bad, pore water pressure can be increased dramatically, when pore water pressure arrives greatly total stress
When value, effective stress just drops to 0, and particle suspends in water, and sand body liquefies.On the one hand, sand liquefaction is ground work
The important subject of journey, the sand liquefaction as caused by dynamic load cause foundation failure, ground sandblasting to emit water, building destruction etc.
Phenomenon causes massive losses to national economy, seriously threatens people's lives and properties.For example, water-jet makes underground
Pore water and sand particle in layer of sand are moved to earth's surface, to make foundation failure, while solid-state and liquid in sub-surface
Missing, leads to different degrees of depression；Above ground structure is set to tilt, crack, topple over, sink, the roadbed sliding of road, road surface is indulged
It splits；In ocean engineering, then ocean foundation structure is shown as a long time by the horizontal loadings ringing such as wave, with leading to sea bed
Layer liquefaction unstability, causes ocean foundation structure to destroy, seriously endangers securely generating for marine mining platform.On the other hand, it shakes
Dynamic platform test can study the earthquake response and failure mechanism of rock-soil material and works well, in atomic reactor, sea
Foreign Structural Engineering, hydro-structure, science of bridge building etc. all played an important role, and simulation vibratory test is current research sand
One of the important means of soil liquefaction.However, shake table acquisition expenses is higher, for carrying out sand liquefaction essential characteristic and destroying former
Reason research has limitation.For this reason, it may be necessary to a kind of small vibrating platform experimental rig suitable for weak Sand Liquefaction Analysis into
Row researching and designing.
Utility model content
The micro computer that in order to overcome the deficiencies of the prior art, the utility model provides suitable for weak Sand Liquefaction Analysis
Tool shaketalle test device realizes the research to sand liquefaction essential characteristic, has reached saving experimental study cost, quicklook
Disclose the target of sea bed sand liquefaction rule under the horizontal loads such as ocean wave.
The concrete scheme of micromachine shaketalle test device suitable for weak Sand Liquefaction Analysis is as follows:
Suitable for the micromachine shaketalle test device of weak Sand Liquefaction Analysis, including controller, controller and dynamic
Force system connection, dynamical system are connect with the shake table for sample to be arranged, and controller is connect with input part, passes through input unit
Part controls the frequency of dynamical system, and the thrust of shake table is calculated by controller, to know that liquefaction and thrust size occur for sample
Relationship.
Above-mentioned experimental rig, shake table drive rock-soil material or structure sample to be vibrated, and sample is driven to liquefy,
Test of many times, it can be deduced that the relationship of sample liquefaction situation and shake table thrust size, controller band display, thus by aobvious
Show that device shows the size of thrust and power system frequency, structure setting is simple, can reveal that the horizontal loads such as ocean wave
Lower sea bed sand liquefaction rule and foundation structure instability status.
Further, it in order to realize that shake table drives sample reciprocating motion in the horizontal direction, is generated by moving back and forth
Vibration is consistent with practical ocean wave in sea bed effect, and the dynamical system is connect by transmission mechanism with the shake table.
Further, the amplitude direction that the shake table generates is horizontal direction.
Further, the shake table includes the drive roll and driven voller for being spaced set distance setting, drive roll and power
System connection, is arranged conveyer belt between drive roll and driven voller, the sample is set to transmission belt surface.
Further, the shake table is supported by rack, and the drive roll and driven voller of shake table are supported by rack, and
The fixing piece for limiting sample is installed in shake table upper surface, and fixing piece is in middle empty frames shape, for limiting sample from side.
Further, the transport mechanism is belt transmission agency or chain sprocket transport mechanism, the dynamical system
For motor, motor drives belt transmission agency operating, and input part is the power velometer of motor, and the governor and controller connect
It connects, so that the drive roll of shake table be driven to operate, belt side connects with the belt pulley for being fixed on drive roll in belt transmission agency
It connects.
Further, multiple gears (belt pulley) with conveyer belt cooperation are arranged in the drive roll, multiple gears
Size is different, to further obtain different size of thrust F, has widened the thrust size that device can provide.
The rock-soil material for carrying out analysis of experiments or structure sample are set to shake table, pass through controller by entire experimental rig
The test parameters such as used frequency are tested in (computer or industrial personal computer with keyboard or human-computer interaction interface) setting, are mentioned by motor
It for energy source and power, operates it according to the test parameters of controller setting, drives shake table operation.Wherein, controller is according to vibration
The spectrum signature of dynamic platform, controller calculates suitable thrust according to the frequency of seismic wave to be simulated, to control dynamical system
It is exported according to demand, enables shake table render analog seismic wave.
The test method of micromachine shaketalle test device suitable for weak Sand Liquefaction Analysis, specific steps are such as
Under:
1) sample is fixed on shake table, is in off working state；
2) controller tests the power velometer control for determining the frequency f, f of pilot system by input part motor according to setting
System, to control dynamical system according to the angular velocity omega of setting1Rotation, shake table is with speed v2Advance, generate thrust F, drives vibration
Dynamic platform vibration, makes sample generate liquefaction, to carry out correlation test research.
Specifically, dynamical system drives belt with speed v1The drive roll of uniform rotation, belt and shake table connects, actively
Roller is with angular velocity omega2Rotation, shake table is with speed v2It is mobile, by angular velocity omega2With speed v2Thrust F is generated, because drive roll is equipped with
Different gears may be selected in various sizes of gear, to generate different size of thrust.
ω1=2 π f, f are dynamical system output frequency (Hz)；
v1=ω1D1/ 2, (m), wherein D1For motor diameter；
ω2=v1/ D ', wherein D ' is the different-diameter of first gear on drive roll；
v2=ω2D2, wherein D2For active roller diameter；
Due to,
Acceleration A=ω2v2 (m/s2)；
So thrust F=(m0+m1+m2+ ...) A (N)；
In formula: m0-shake table motion parts effective mass (kg)
M1-tall auxiliary mesa quality (kg)
M2-test specimen (including fixture, mounting screw) quality (kg).
In this way by the frequency of control dynamical system motor, the thrust F of final control output, and shown by controller
Show, so that it is determined that sample liquefies when electric machine frequency is much, reaches test objective.
Compared with prior art, the utility model has the beneficial effects that
1) the utility model controls the movement of shake table by controller, effectively can act on lower weakness by simulation short arc
The analysis of sandy soil stratum liquefaction characteristics, saves experimental study cost, extends the technological means of weak Sand Liquefaction Analysis.
2) the utility model effectively simulation difference excited frequency can act on lower weak sandy soil stratum liquefaction characteristics analysis,
For studying liquefaction field plastic deformation feature with the changing rule of frequency, and then liquefaction is disclosed for structure in sandy soil stratum
The stability of object.
3) the utility model breaks the deficiencies of original shaketalle test is at high cost, the test period is long, makes it have certain
Transformation property, saves experimental study cost, extends the technological means of weak Sand Liquefaction Analysis.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present application, and the application's shows
Meaning property embodiment and its explanation are not constituted an undue limitation on the present application for explaining the application.
Fig. 1 is the utility model experimental rig schematic diagram.
Wherein: 1. controllers；2, power supply；3, motor；4, belt；5, shake table；6, drive roll；7, conveyer belt；8, fixed
Part.
Specific embodiment
It is noted that following detailed description is all illustrative, it is intended to provide further instruction to the application.Unless another
It indicates, all technical and scientific terms used herein has usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singular
Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet
Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
As background technique is introduced, the deficiencies in the prior art, in order to solve technical problem as above, this Shen
It please propose the micromachine shaketalle test device for being suitable for weak Sand Liquefaction Analysis.
In a kind of typical embodiment of the application, as indicated, being suitable for the micromachine of weak Sand Liquefaction Analysis
Shaketalle test device, including controller 1, controller 1 are connect with dynamical system, and dynamical system is powered by power supply 2, power
System is connect with the shake table 5 for sample to be arranged, and controller 1 is connect with input part, controls dynamical system by input part
The frequency of system is controlled the vibration frequency of shake table 5 by controller 1 by dynamical system.
Above-mentioned experimental rig, shake table 5 drive rock-soil material or structure sample to be vibrated, and drive sample that liquid occurs
Change, test of many times, it can be deduced that the relationship of sample liquefaction situation and shake table thrust size, structure setting is simple, can reveal that
Sea bed sand liquefaction rule under the horizontal loads such as ocean wave.
In order to realize that shake table 5 drives sample reciprocating motion in the horizontal direction, vibration is generated by moving back and forth, with reality
Border ocean wave is consistent in sea bed effect, and dynamical system is connect by transmission mechanism with the shake table.What shake table 5 generated
Amplitude direction is horizontal direction.
Shake table 5 includes the drive roll 6 and driven voller of interval set distance setting, and drive roll 6 is connect with dynamical system, main
Conveyer belt 7 is set between dynamic roller and driven voller, and the sample is set to 7 surface of conveyer belt.
Shake table 5 is supported by rack, and the drive roll 6 and driven voller of shake table 5 are supported by rack, and on shake table 5
The fixing piece 8 for limiting sample is installed on surface, and fixing piece 8 is in middle empty frames shape, for limiting sample from side, fixing piece 8
Length accounts for the 1/2-3/4 of shake table, and the height of fixing piece 8 is less than or equal to 0.7m, and sample is set in fixing piece and is lower than fixing piece
Highest point, the length of shake table is greater than 1.5m, to improve the accuracy of simulation.
Transport mechanism is belt transmission agency or chain sprocket transport mechanism, and dynamical system is motor 3, and motor 3 drives
Belt transmission agency operating, so that the drive roll 6 of shake table 5 be driven to operate, in belt transmission agency belt side be fixed on
The belt pulley of drive roll connects, and active roller surface also sets up the belt wheel with transmission band connection.
The rock-soil material for carrying out analysis of experiments or structure sample are set to shake table, pass through controller by entire experimental rig
The test parameters such as used frequency are tested in (computer or industrial personal computer with keyboard or human-computer interaction interface) setting, are mentioned by motor
It for energy source and power, operates it according to the test parameters of controller setting, drives shake table operation.Wherein, controller is according to vibration
The spectrum signature of dynamic platform, controller calculates suitable thrust according to the frequency of seismic wave to be simulated, to control dynamical system
It is exported according to demand, enables shake table render analog seismic wave, thus by electric machine frequency, observation sample liquefaction feelings
Condition, and then the relationship of thrust size and sample liquefaction situation is obtained, thus Guiding Practice.
The test method of micromachine shaketalle test device suitable for weak Sand Liquefaction Analysis, specific steps are such as
Under:
1) sample is fixed on shake table, is in off working state.
2) controller tests the frequency f for determining pilot system according to setting, to control dynamical system according to the angle of setting
Speed omega1Rotation, shake table is with speed v2Advance, generate thrust F, drives shake table vibration, sample is made to generate liquefaction, from
And carry out correlation test research.
It 3) is more than the 1/4 of its diameter for unstable failure control mark with suction caisson foundation structure (sample) horizontal displacement
Standard, when reaching this value, off-test.
Wherein, in the step 2) controller according to following formula calculate thrust F:
Controller tests used frequency f test parameters according to setting, drives motor to make it to control dynamical system
According to the angular velocity omega of setting1Rotation drives belt with speed v1Uniform rotation, belt are bundled in the tooth of drive roll different-diameter
It takes turns on (belt pulley), to generate different angular velocity omegas2With secondary station speed v2, by angular velocity omega2With speed v2Generate thrust
F drives shake table vibration, sample is made to generate liquefaction, to carry out correlation test research.
Controller calculates thrust F by following formula,
ω1=2 π f, f are the output frequency (Hz) of motor；
v1=ω1D1/ 2, (m), wherein D1It for motor diameter, can be manually entered, controller is connect for parameter with keyboard
Input；
ω2=v1/ D ', wherein D ' is the different-diameter of active roller gear, can be manually entered；
v2=ω2D2, wherein D2For active roller diameter, can be manually entered；
Due to,
Acceleration A=ω2v2 (m/s2)；
So thrust F=(m0+m1+m2+ ...) A (N)；
In formula: m0-shake table motion parts effective mass (kg)
M1-tall auxiliary mesa quality (kg)
M2-test specimen (including fixture, mounting screw) quality (kg), these three mass parameters can be manually entered.
The foregoing is merely preferred embodiment of the present application, are not intended to limit this application, for the skill of this field
For art personnel, various changes and changes are possible in this application.Within the spirit and principles of this application, made any to repair
Change, equivalent replacement, improvement etc., should be included within the scope of protection of this application.
Claims (7)
1. being suitable for the micromachine shaketalle test device of weak Sand Liquefaction Analysis, which is characterized in that including controller, control
Device processed is connect with dynamical system, and dynamical system is connect with the shake table for sample to be arranged, and controller is connect with input part, is led to
Cross input part control dynamical system frequency, by controller calculate shake table thrust, thus know sample occur liquefaction with
The relationship of thrust size.
2. the micromachine shaketalle test device according to claim 1 for being suitable for weak Sand Liquefaction Analysis, special
Sign is that the dynamical system is connect by transmission mechanism with the shake table.
3. the micromachine shaketalle test device according to claim 1 for being suitable for weak Sand Liquefaction Analysis, special
Sign is that the amplitude direction that the shake table generates is vertical direction；And the installation of shake table upper surface is for limiting consolidating for sample
Determine part.
4. the micromachine shaketalle test device according to claim 3 for being suitable for weak Sand Liquefaction Analysis, special
Sign is that the shake table is supported by rack.
5. the micromachine shaketalle test device according to claim 2 for being suitable for weak Sand Liquefaction Analysis, special
Sign is that the transmission mechanism is belt transmission agency, and the dynamical system is motor.
6. the micromachine shaketalle test device according to claim 1 for being suitable for weak Sand Liquefaction Analysis, special
Sign is that the shake table includes the drive roll and driven voller for being spaced set distance setting, and drive roll is connect with dynamical system, main
Conveyer belt is set between dynamic roller and driven voller, and the sample is set to transmission belt surface.
7. the micromachine shaketalle test device according to claim 6 for being suitable for weak Sand Liquefaction Analysis, special
Sign is that multiple gears with conveyer belt cooperation are arranged in the drive roll, and the size of multiple gears is different.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821435407.7U CN208705213U (en) | 2018-09-03 | 2018-09-03 | Micromachine shaketalle test device suitable for weak Sand Liquefaction Analysis |
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| CN201821435407.7U CN208705213U (en) | 2018-09-03 | 2018-09-03 | Micromachine shaketalle test device suitable for weak Sand Liquefaction Analysis |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060646A (en) * | 2018-09-03 | 2018-12-21 | 山东大学 | Micromachine shaketalle test device and method suitable for weak Sand Liquefaction Analysis |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060646A (en) * | 2018-09-03 | 2018-12-21 | 山东大学 | Micromachine shaketalle test device and method suitable for weak Sand Liquefaction Analysis |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20190405 Termination date: 20190903 |