CN105928774A - Soil specimen resonant column device - Google Patents
Soil specimen resonant column device Download PDFInfo
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- CN105928774A CN105928774A CN201610532783.7A CN201610532783A CN105928774A CN 105928774 A CN105928774 A CN 105928774A CN 201610532783 A CN201610532783 A CN 201610532783A CN 105928774 A CN105928774 A CN 105928774A
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- soil sample
- fixed pulley
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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
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Abstract
The invention discloses a soil specimen resonant column device, which comprises a base, a mass block, a vertical displacement sensor, a steel rope, a pulley block and a balance block, wherein the mass block comprises a cross frame, magnets, an accelerometer and a balancing weight; bar magnets are arranged at the four ends of the cross frame; coils sleeve two ends of each bar magnet; and the accelerometer and the balancing weight are arranged on the radial edge of the cross frame respectively, and have equal weight, so that the mass block is balanced. The bottom end of the soil specimen is fixed on the base and the top end of the soil specimen is connected with the center of the mass block; the balance blocks and the mass blocks, which have equal weight are connected by the steel rope, and are balanced through the pulley block, so that the effects of the mass blocks on the soil specimen in the test process are reduced. When current flows through the coils, the soil specimen is twisted by driving the mass blocks; the accelerometer is used for detecting an angular acceleration signal of twisting of the soil specimen; and the resonant frequency and the damping ratio of the soil specimen can be measured through the angular acceleration signal.
Description
Technical field
The present invention relates to soil sample Resonant Column device.
Background technology
The buildings such as the bridge on ground, house are being shaken by earthquake, traffic loading vibration or machinery
When swinging, make soil bear the vibration of different amplitudes and frequency from these building systems, once this
The resonant frequency of a little building systems falls in the frequency range of external load, will resonate, right
Building produces harm greatly.The dynamic properties of soils of research soil, to shockproof, damping with combated a natural disaster
Extremely important meaning.
Resonant Column is the important tests equipment of test soil dynamic parameters, and it is by applying soil not
The load of same frequency and amplitude realizes measuring and analyze soil dynamic properties of soils, is used for measuring dynamic soil
Character from small strain to moderate strains.The theoretical basis of resonant column test is that ripple passes in the soil body
Broadcast theory-wave theory.Typical resonant column test model is as shown in Figure 1.Sample is solid
Or the hollow cylindrical soil body, bottom is fixed on pedestal, and top adds a Rigid Mass block,
And can freely swing by horizontal rotatio direction, i.e. other end structure freely is fixed in one end.Logical
Crossing mass and sample applies twisting resistance, sample will rotate with vibration.
At present, having two ways to realize resonant column test in the world, one is free vibration method, by
Torque drivers, the generation coil in moment of torsion magnetic field, acceleration transducer, charge amplifier and ripple
Monitors etc. form, as shown in Figure 2.Apply a moment of torsion at the top of test specimen, make sample of having a try
Producing angular displacement, then discharge torsion, test specimen will be in free damping state, according to each
Free oscillating period, TiTry to achieve average frequency, be approximately resonant frequency.Two is resonance method, by
Signal generator applies the sine wave of certain frequency scope to test specimen, and starts gradually from 0Hz
Raise, constantly detection sample response frequency, until maximum strain amplitude looks for resonant frequency.
When strain amplitude is in maximum, low-limit frequency is the fundamental frequency of system under test (SUT).Fig. 3 gives and adopts
The scheme of resonant frequency is measured with lee sajous graphics.The vibration letter of oscillograph y passage input sample
Number, the signal in x passage input drive signal source.Owing to being linear system, vibration signal and letter
The frequency in number source is identical, but power amplifier, coil can produce phase shift, therefore oscillography to signal
Device shows an ellipse.The output frequency of regulation signal source, starts constantly to rise from 0Hz,
The transverse making display is the longest, and frequency now is resonant frequency.
All there is certainty of measurement in above two mode and accuracy such as is extremely limited at the defect.
Summary of the invention
In order to overcome the deficiencies in the prior art, it is an object of the invention to provide soil sample Resonant Column
Device, it is possible to reduce the mass impact on soil sample, improves certainty of measurement.
The present invention realizes by the following technical solutions:
Soil sample Resonant Column device, including pedestal, soil sample, mass, steel cable, assembly pulley
And balance weight, wherein mass includes cross, bar magnet, accelerometer and balancing weight,
Being fitted with bar magnet on 4 ends of cross, the two ends of each bar magnet are all arranged with
Coil；Balancing weight is fixed on cross, and the weight of balancing weight is equal in weight with accelerometer,
And balancing weight and accelerometer are symmetrical arranged with the axis of mass for axis of symmetry；The end of soil sample
End is fixed on pedestal, and top is connected with mass center；In one end of steel cable and mass
The heart connects, and steel cable is set around assembly pulley, and the other end of steel cable is connected with balance weight, this balance weight
Weight for offsetting the weight of mass.
Preferably, mass is also arranged above vertical displacement sensor, this vertical displacement sensor
For detecting soil sample displacement in vibration processes in vertical direction, for user as ginseng
Examine.
Preferably, the longitudinal edge of described cross is respectively equipped with acceleration transducer and and acceleration
The equiponderant balancing weight of machine, makes mass balance, and this acceleration transducer is used for detecting soil examination
Angular acceleration during sample vibration, for user as reference.
Preferably, the top of described soil sample and bottom are respectively equipped with a permeable stone, soil sample top
The permeable stone in portion is fixed on mass center, and the permeable stone of the bottom of soil sample is fixed on base
On seat, two permeable stones are all connected with a drain pipe, and drain pipe passes through the bottom of pedestal to outside
Connection.
Preferably, soil sample Resonant Column device also includes plexiglass box, described soil sample,
Mass, steel cable, assembly pulley and balance weight are respectively positioned in plexiglass box.
Preferably, described plexiglass box is provided with passage, the gas outside the connection of this passage
Source.Outside source of the gas is passed through to plexiglass box by passage, to regulate soil sample institute
The pressure needed.
Preferably, any one structure during described assembly pulley is following structure one to structure three:
Structure one: assembly pulley includes a fixed pulley, it is fixed that the other end of described steel cable is set around this
Lead to be connected with balance weight from this fixed pulley after pulley；
Structure two: assembly pulley includes the first fixed pulley and the second fixed pulley, another of described steel cable
Hold and lead to from the second fixed pulley after being set around the first fixed pulley, the second fixed pulley successively and balance
Block connects；
Structure three: assembly pulley includes the first fixed pulley, the second fixed pulley and the 3rd fixed pulley, the
One fixed pulley and the second fixed pulley are positioned on same level line, and it is fixed sliding that the 3rd fixed pulley is positioned at first
Wheel and the top of the second fixed pulley, it is fixed that described steel cable is set around first successively with the track of S font
Lead to balance weight even from the 3rd fixed pulley after pulley, the second fixed pulley and the 3rd fixed pulley
Connect.
Compared to existing technology, the beneficial effects of the present invention is:
The angular acceleration signal that the controller of the present invention is twisted by accelerometer detection soil sample,
Resonant frequency and the damping ratio of soil sample is finally given through signal processing.By pulley and balance
The setting of block, offsets the weight of mass, to reduce mass to soil sample in test process
Impact, improves degree of accuracy further.
Accompanying drawing explanation
Fig. 1 is the resonant column test illustraton of model of prior art.
Fig. 2 is the system structure schematic diagram of the free vibration method of prior art.
Fig. 3 is the system structure schematic diagram of the resonance method of prior art.
Fig. 4 is the overall structure figure of the soil sample Resonant Column device of the present invention.
Fig. 5 is the structure chart of the mass of the present invention.
Fig. 6 be the present invention receive shell, pedestal schematic diagram.
Fig. 7 is the soil sample of the present invention, permeable stone and drain structure schematic diagram.
In figure: 1, soil sample；2, mass；3, pedestal；4, steel cable；5, assembly pulley；
6, balance weight；7, cross；8, Magnet；9, accelerometer；10, balancing weight；11、
Connector；12, plexiglass box；13, permeable stone；14, drain pipe.
Detailed description of the invention
Below, in conjunction with accompanying drawing and detailed description of the invention, the present invention is described further:
Seeing Fig. 4 to Fig. 7, the present invention provides a kind of soil sample Resonant Column device, for soil
Sample measures, including cylindrical plexiglass box 12, in plexiglass box 12
It is provided with soil sample 1, mass 2, steel cable 4, assembly pulley 5 and balance weight 6.
Pedestal 3 is fixed on the bottom surface of plexiglass box 12, and soil sample 1 is fixed on pedestal 3
On, soil sample is packed by rubber membrane, assembling shell be arranged on pedestal 3, and rubber membrane is close to dress
Join inside shell, and evacuation processes, it is ensured that soil sample is cylindrical, and mass 2 is arranged on soil
Sample 1 upper end, after soil sample 1 installation, assembling shell of dismantling.Mass 2 includes cross
Frame 7,11, four blocks of Magnet 8 of connector and accelerometer 9, four blocks of bar magnets 8 lead to respectively
Crossing connector 11 to be uniformly fixed on cross 7, the two ends of each block of bar magnet 8 are respectively
It is arranged with a coil (not shown)；One end of steel cable 4 is connected with the central point of mass 2,
The other end leads to be connected with balance weight 6 from assembly pulley 5 after being set around assembly pulley 5, acceleration
Meter 9 is arranged on the edge of cross 7, and accelerometer 9 accelerates for the angle detecting soil sample 1
Degree signal.Fig. 2 can be participated in, the most also include charge amplifier, charge amplifier
Angular acceleration signal is converted to voltage, it is possible to be delivered to monitor.Drive system provides
Drive signal to coil.
The structure of assembly pulley 5 can have at least three kinds of embodiments, and one is that assembly pulley 5 includes
One fixed pulley, the other end of described steel cable 4 is drawn from this fixed pulley after being set around this fixed pulley
To being connected with balance weight 6.Its two assembly pulley 5 includes two fixed pulleys, be the first fixed pulley and
Second fixed pulley, the other end of described steel cable 4 is set around the first fixed pulley, the second fixed cunning successively
Lead to be connected with balance weight 6 from the second fixed pulley after wheel, it will be understood that in the second structure
In, steel cable 4 is all the upper slide rail being set around two fixed pulleys, concrete, another of steel cable 4
End first slide rail with the first fixed pulley top contacts and leads to the cunning on the second fixed pulley top
Rail, the other end of rear steel rope 4 lead to downwards be connected with balance weight 6 from the second fixed pulley；
It three includes the first fixed pulley, the second fixed pulley and the 3rd fixed pulley for assembly pulley, and first is fixed sliding
Wheel and the second fixed pulley are positioned on same level line, and the 3rd fixed pulley is positioned at the first fixed pulley and the
The top of two fixed pulleys, described steel cable 4 with the track of S font be set around successively the first fixed pulley,
Lead to be connected with balance weight 6 from the 3rd fixed pulley after second fixed pulley and the 3rd fixed pulley.?
In the third structure, it will be understood that the other end of steel cable 4 is first from the first fixed pulley top
Slide rail is through leading to the slide rail of the second fixed pulley bottom, and leads to the 3rd from the second fixed pulley
The slide rail on fixed pulley top, leads to downwards be connected with balance weight 6 from the 3rd fixed pulley afterwards.
Pulley block structure shown in Fig. 4 is the third embodiment above-mentioned.
Mass 2 has certain weight, and is fixing in test process, can not change
Become, thus mass 2 is applied with certain gravity on soil sample 1, by balance weight 6
Can offset the weight of this mass 2, i.e. the weight of balance weight 6 is equal to the weight of mass 2,
So that measurement result is more accurate.
During measurement, drive system output drive signal, to coil, makes there is electric current process in coil,
The interphase interaction of Magnet 8 produces active force, makes mass 2 movement under force, twists,
Make soil sample and then twisting, and the angular acceleration signal gathered by accelerometer 9 is finally obtained
Resonant frequency.
Owing to accelerometer 9 itself also has certain weight, the most also can affect
Measurement result, therefore as improving, mass 2 also includes a balancing weight 10, this balancing weight
The weight of 10 is equal in weight with accelerometer 9, and balancing weight 10 and accelerometer 9 are with quality
The axis of block is that axis of symmetry is symmetricly set on cross 7, it is possible to balance accelerometer 9
Weight.
Be additionally provided with on the cross 7 of mass 2 be respectively perpendicular displacement transducer (not shown) and
Acceleration transducer (not shown), acceleration transducer is fixed on the edge of mass 2, should
Vertical displacement sensor is for detecting mass 2 displacement in vertical direction；Acceleration sensing
Device is for detecting horizontal angle acceleration when soil sample 1 vibrates.Horizontal angle acceleration and vertical position
Shifting is available for user as reference.
Seeing Fig. 7, owing to soil sample would generally contain moisture, unavoidable moisture flow to holding shell 1
Bottom, especially in vibration processes, can separate moisture from soil sample, thus try at soil
The bottom of sample 1 and top are respectively equipped with a permeable stone 13, and soil sample Resonant Column device also includes
Drain pipe 14, the permeable stone at soil sample top is fixed on mass center, soil sample
The permeable stone of bottom be fixed on pedestal, two permeable stones are all connected with a drain pipe, and draining
Pipe by the bottom of pedestal to ft connection.
Plexiglass box 12 is provided with passage, the source of the gas outside the connection of this passage.
Outside source of the gas is passed through to plexiglass box 12 by passage, to simulate soil sample place
Local atmospheric pressure so that measure more accurate.
It will be apparent to those skilled in the art that can technical scheme as described above and structure
Think, make other various corresponding changes and deformation, and all these changes and deformation
Within all should belonging to the protection domain of the claims in the present invention.
Claims (7)
1. soil sample Resonant Column device, it is characterised in that include pedestal, soil sample, quality
Block, steel cable, assembly pulley and balance weight, wherein mass includes cross, bar magnet, adds
Velometer and balancing weight, 4 ends of cross are fitted with bar magnet, each bar shaped magnetic
The two ends of ferrum are all arranged with coil；Balancing weight is fixed on cross, the weight of balancing weight with add
Being equal in weight of velometer, and balancing weight and accelerometer are with the axis of mass for axis of symmetry pair
Claim to arrange；The bottom of soil sample is fixed on pedestal, and top is connected with mass center；Steel cable
One end be connected with the center of mass, steel cable is set around assembly pulley, and the other end of steel cable is with flat
Weighing apparatus block connects, and the weight of this balance weight is for offsetting the weight of mass.
2. soil sample Resonant Column device as claimed in claim 1, it is characterised in that described
Mass be also arranged above vertical displacement sensor, this vertical displacement sensor for soil detection
Soil sample displacement in vibration processes.
3. soil sample Resonant Column device as claimed in claim 1, it is characterised in that described ten
The longitudinal edge of cabinet frame is respectively equipped with acceleration transducer and counterweight equiponderant with acceleration machine
Block, makes mass balance, and angle when this acceleration transducer is for detecting soil sample vibration is accelerated
Degree.
4. soil sample Resonant Column device as claimed in claim 1, it is characterised in that described soil
The top of sample and bottom are respectively equipped with a permeable stone, and the permeable stone at soil sample top is fixed on matter
Gauge block center, the permeable stone of the bottom of soil sample is fixed on pedestal, and two permeable stones are equal
Connect a drain pipe, and drain pipe passes through the bottom of pedestal to ft connection.
5. soil sample Resonant Column device as claimed in claim 1, it is characterised in that soil sample
Resonant Column device also includes plexiglass box, described soil sample, mass, steel cable, pulley
Group and balance weight are respectively positioned in plexiglass box.
6. soil sample Resonant Column device as claimed in claim 1, it is characterised in that described in have
Machine glass container is provided with passage, the source of the gas outside the connection of this passage.
7. soil sample Resonant Column device as claimed in claim 1, it is characterised in that described cunning
Wheels are any one structure in following structure one to structure three:
Structure one: assembly pulley includes a fixed pulley, it is fixed that the other end of described steel cable is set around this
Lead to be connected with balance weight from this fixed pulley after pulley；
Structure two: assembly pulley includes the first fixed pulley and the second fixed pulley, another of described steel cable
Hold and lead to from the second fixed pulley after being set around the first fixed pulley, the second fixed pulley successively and balance
Block connects；
Structure three: assembly pulley includes the first fixed pulley, the second fixed pulley and the 3rd fixed pulley, the
One fixed pulley and the second fixed pulley are positioned on same level line, and it is fixed sliding that the 3rd fixed pulley is positioned at first
Wheel and the top of the second fixed pulley, it is fixed that described steel cable is set around first successively with the track of S font
Lead to balance weight even from the 3rd fixed pulley after pulley, the second fixed pulley and the 3rd fixed pulley
Connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610532783.7A CN105928774B (en) | 2016-07-07 | 2016-07-07 | Soil sample resonance column device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610532783.7A CN105928774B (en) | 2016-07-07 | 2016-07-07 | Soil sample resonance column device |
Publications (2)
| Publication Number | Publication Date |
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| CN105928774A true CN105928774A (en) | 2016-09-07 |
| CN105928774B CN105928774B (en) | 2019-08-23 |
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| CN201610532783.7A Active CN105928774B (en) | 2016-07-07 | 2016-07-07 | Soil sample resonance column device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109001034A (en) * | 2018-08-10 | 2018-12-14 | 同济大学 | A kind of test method damped after Damage for Brittle Material |
| CN113790982A (en) * | 2021-07-30 | 2021-12-14 | 南华大学 | Pile-unsaturated soil interface friction visualization test device and method |
| CN114252214A (en) * | 2021-12-23 | 2022-03-29 | 中国矿业大学 | Constant pressure experiment-based pressure balance valve leakage amount detection device and method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3924451A (en) * | 1974-08-21 | 1975-12-09 | Vincent P Drnevich | Resonant column testing apparatus |
| KR101264292B1 (en) * | 2011-07-20 | 2013-05-27 | 한국수자원공사 | Resonant column testing apparatus with image-based analysis system for deformation modes of specimen using high speed camera |
| CN103760241B (en) * | 2014-01-11 | 2016-08-17 | 吉林大学 | Shipborne resonant column instrument |
| CN205879667U (en) * | 2016-07-07 | 2017-01-11 | 广州国光仪器有限公司 | Soil sample resonance post device |
-
2016
- 2016-07-07 CN CN201610532783.7A patent/CN105928774B/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109001034A (en) * | 2018-08-10 | 2018-12-14 | 同济大学 | A kind of test method damped after Damage for Brittle Material |
| CN113790982A (en) * | 2021-07-30 | 2021-12-14 | 南华大学 | Pile-unsaturated soil interface friction visualization test device and method |
| CN113790982B (en) * | 2021-07-30 | 2024-03-29 | 南华大学 | Pile-unsaturated soil interface friction visualization test device and method |
| CN114252214A (en) * | 2021-12-23 | 2022-03-29 | 中国矿业大学 | Constant pressure experiment-based pressure balance valve leakage amount detection device and method |
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| CN105928774B (en) | 2019-08-23 |
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