CN105928774B - Soil sample resonance column device - Google Patents
Soil sample resonance column device Download PDFInfo
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- CN105928774B CN105928774B CN201610532783.7A CN201610532783A CN105928774B CN 105928774 B CN105928774 B CN 105928774B CN 201610532783 A CN201610532783 A CN 201610532783A CN 105928774 B CN105928774 B CN 105928774B
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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 soil sample resonance column devices, including pedestal, mass block, vertical displacement sensor, steel cable, pulley blocks and balance weight；Wherein mass block is made of cross, magnet, accelerometer and clump weight, is fitted with bar magnet on 4 ends of cross, the both ends of each bar magnet are all arranged with coil；Accelerometer and clump weight are separately mounted to cross radial edges, and the two is equal in weight, and balance mass block.The bottom end of soil sample is fixed on the base, and top is connect with mass block center.Equiponderant balance weight is connected with mass block with steel cable, is allowed to balance by pulley blocks, to reduce the influence of mass block during the test to soil sample.When coil has electric current to flow through, twist soil sample driving mass block, accelerometer is used to detect the angular acceleration signal of soil sample twisting.The measurement to soil sample resonant frequency and damping ratio is completed by angular acceleration signal.
Description
Technical field
The present invention relates to soil sample resonance column devices.
Background technique
The buildings such as bridge, the house on ground make soil and these when by earthquake, traffic loading vibration or mechanical oscillation
Building system bears the vibration of different amplitude and frequency, once the resonant frequency of these building systems falls in external load
Frequency range, will resonate, to building generate greatly harm.The dynamic properties of soils for studying soil to shockproof, damping and resists
Calamity has extremely important meaning.
Resonant Column is the important tests equipment for testing soil dynamic parameters, it is by applying different frequency and amplitude to soil
Load realizes measurement and analyzes native dynamic properties of soils, for measure the native property from small strain to moderate strains of dynamic.Resonant Column
The theoretical basis of test is wave communication theory-wave theory in the soil body.Typical resonant column test model is as shown in Figure 1.Examination
Sample is the solid or hollow cylindrical soil body, and bottom is fixed on the base, and top adds a Rigid Mass block, and can be by water
Flat direction of rotation freely swings, i.e. the fixed free structure of the other end in one end.Twisting resistance, sample are applied to sample by mass block
Vibration will be rotated with.
Currently, resonant column test is realized there are two types of mode in the world, first is that free vibration method, by torque drivers, generates
The composition such as coil, acceleration transducer, charge amplifier and the wave recorder in torque magnetic field, as shown in Figure 2.At the top of test specimen
Apply a torque, make sample generation angular displacement of having a try, then discharges torsion, test specimen will be in free damping state, according to each
A free oscillating period, TiAverage frequency is acquired, is approximately resonant frequency.Second is that resonance method, is applied by signal generator to test specimen
The sine wave of certain frequency range, and gradually risen since 0Hz, sample response frequency is constantly detected, until maximum strain
Amplitude looks for resonant frequency.When strain amplitude is in maximum value, low-limit frequency is the fundamental frequency of system under test (SUT).Fig. 3 gives use
The scheme of lee sajous graphics measurement resonant frequency.The channel oscillograph y inputs the vibration signal of sample, the channel x input drive signal
The signal in source.Due to being linear system, vibration signal is identical as the frequency of signal source, but power amplifier, coil are to signal meeting
Generate phase shift, therefore one ellipse of oscilloscope display.The output frequency in adjustment signal source, constantly rises since 0Hz, makes to show
Transverse longest, frequency at this time is resonant frequency.
There is measurement accuracy and the defects of accuracy be extremely limited in above two mode.
Summary of the invention
For overcome the deficiencies in the prior art, the purpose of the present invention is to provide soil sample resonance column device, can reduce
Influence of the mass block to soil sample improves measurement accuracy.
The present invention is implemented with the following technical solutions:
Soil sample resonates column device, including pedestal, soil sample, mass block, steel cable, pulley blocks and balance weight, wherein quality
Block includes cross, bar magnet, accelerometer and clump weight, is fitted with bar magnet, each on 4 ends of cross
The both ends of shape magnet are all arranged with coil；Clump weight is fixed on cross, the weight and the weight phase of accelerometer of clump weight
Deng, and clump weight and accelerometer are symmetrical arranged by symmetry axis of the axis of mass block；The bottom end of soil sample is fixed on the base,
Top is connect with mass block center；One end of steel cable and the center of mass block connect, and steel cable is set around pulley blocks, steel cable it is another
End is connect with balance weight, and the weight of the balance weight is used to offset the weight of mass block.
Preferably, it is additionally provided with vertical displacement sensor above mass block, the vertical displacement sensor is for detecting soil sample
Displacement in vibration processes in vertical direction, so that user is as reference.
Preferably, the longitudinal edge of the cross be respectively equipped with acceleration transducer and with acceleration machine is equiponderant matches
Pouring weight balances mass block, which is used to detect angular acceleration when soil sample vibration, so that user is as ginseng
It examines.
Preferably, a permeable stone is respectively equipped at the top and bottom of the soil sample, the permeable stone at the top of soil sample is fixed
In mass block center, the permeable stone of the bottom of soil sample is fixed, and two permeable stones are all connected with a drainpipe on the base, and
Drainpipe is connected to by the bottom of pedestal to outside.
Preferably, soil sample resonance column device further includes plexiglass box, the soil sample, mass block, steel cable, pulley
Group and balance weight are respectively positioned in plexiglass box.
Preferably, the plexiglass box is equipped with venthole, the gas source outside venthole connection.External gas source is logical
It crosses venthole to be passed through to plexiglass box, with pressure needed for adjusting soil sample.
Preferably, the pulley blocks are any one structure with flowering structure one into structure three:
Structure one: pulley blocks include a fixed pulley, and the other end of the steel cable, which is set around after the fixed pulley, determines cunning from this
Wheel is led to be connect with balance weight；
Structure two: pulley blocks include the first fixed pulley and the second fixed pulley, and the other end of the steel cable is successively set around the
It leads to after one fixed pulley, the second fixed pulley from the second fixed pulley and is connect with balance weight；
Structure three: pulley blocks include the first fixed pulley, the second fixed pulley and third fixed pulley, and the first fixed pulley and second are determined
Pulley is located in same horizontal line, and third fixed pulley is located at the top of the first fixed pulley and the second fixed pulley, and the steel cable is with S word
The track of type is successively set around after the first fixed pulley, the second fixed pulley and third fixed pulley and leads to and balance from third fixed pulley
Block connection.
Compared with prior art, the beneficial effects of the present invention are:
Controller of the invention detects the angular acceleration signal of soil sample twisting by accelerometer, most by signal processing
The resonant frequency and damping ratio of soil sample are obtained eventually.By the setting of pulley and balance weight, the weight of mass block is offset, to reduce
Influence of the mass block to soil sample during the test, further increases accuracy.
Detailed description of the invention
Fig. 1 is the resonant column test illustraton of model of the prior art.
Fig. 2 is the system structure diagram of the free vibration method of the prior art.
Fig. 3 is the system structure diagram of the resonance method of the prior art.
Fig. 4 is the overall structure figure of soil sample resonance column device of the invention.
Fig. 5 is the structure chart of mass block of the invention.
Fig. 6 is the of the invention shell, pedestal schematic diagram received.
Fig. 7 is soil sample of the invention, permeable stone and drain structure schematic diagram.
In figure: 1, soil sample；2, mass block；3, pedestal；4, steel cable；5, pulley blocks；6, balance weight；7, cross；8, magnetic
Iron；9, accelerometer；10, clump weight；11, connector；12, plexiglass box；13, permeable stone；14, drainpipe.
Specific embodiment
In the following, being described further in conjunction with attached drawing and specific embodiment to the present invention:
Referring to fig. 4 to Fig. 7, the present invention provides a kind of soil sample resonance column device, for being measured to soil sample, including circle
Cylindrical plexiglass box 12 is provided with soil sample 1, mass block 2, steel cable 4,5 and of pulley blocks in plexiglass box 12
Balance weight 6.
Pedestal 3 is fixed on the bottom surface of plexiglass box 12, and soil sample 1 is fixed on pedestal 3, and soil sample is by rubber membrane
Packaging, is mounted on pedestal 3 by assembly shell, and rubber membrane is close on the inside of assembly shell, and vacuumize process, it is ensured that soil sample is cylinder
Shape, mass block 2 are mounted on 1 upper end of soil sample and dismantle after soil sample 1 is installed and assemble shell.Mass block 2 include cross 7,
11, four blocks of magnet 8 of connector and accelerometer 9, four blocks of bar magnets 8 are uniformly fixed on cross 7 by connector 11 respectively
On, the both ends of each block of bar magnet 8 are rotating around equipped with a coil (not shown)；One end of steel cable 4 and the central point of mass block 2
Connection, the other end are set around after pulley blocks 5 to lead to from pulley blocks 5 and connect with balance weight 6, and accelerometer 9 is mounted on cross 7
Edge, accelerometer 9 is used to detect the angular acceleration signal of soil sample 1.Fig. 2 can be participated in, in practical applications further includes electricity
Lotus amplifier, charge amplifier angular acceleration signal is converted to voltage, and can be delivered to recorder.Drive system provides
Driving signal is to coil.
The structure of pulley blocks 5 can have at least three kinds of embodiments, and one is that pulley blocks 5 include a fixed pulley, described
The other end of steel cable 4 is set around after the fixed pulley to lead to from the fixed pulley and connect with balance weight 6.Secondly pulley blocks 5 include two
A fixed pulley, is the first fixed pulley and the second fixed pulley, and the other end of the steel cable 4 is successively set around the first fixed pulley, second
It leads to after fixed pulley from the second fixed pulley and is connect with balance weight 6, it will be understood that in second of structure, steel cable 4 is winding
In the upper sliding rail of two fixed pulleys, specifically, the other end of steel cable 4 is contacted and is drawn with the sliding rail on the first fixed pulley top first
To the sliding rail on the second fixed pulley top, the other end of rear steel rope 4 lead to downwards from the second fixed pulley and connect with balance weight 6；
Thirdly including the first fixed pulley, the second fixed pulley and third fixed pulley for pulley blocks, the first fixed pulley and the second fixed pulley are located at
In same horizontal line, third fixed pulley is located at the top of the first fixed pulley and the second fixed pulley, and the steel cable 4 is with the rail of S font
Mark is led to and the company of balance weight 6 after being successively set around the first fixed pulley, the second fixed pulley and third fixed pulley from third fixed pulley
It connects.In the third structure, it will be understood that the other end of steel cable 4 is first from the sliding rail on the first fixed pulley top by leading to
The sliding rail of second fixed pulley lower part, and the sliding rail on third fixed pulley top is led to from the second fixed pulley, it is slided surely from third later
Wheel leads to connect with balance weight 6 downwards.Pulley block structure shown in Fig. 4 is the third above-mentioned embodiment.
Mass block 2 has certain weight, and be during the test it is fixed, it is unmodifiable, thus mass block 2
Certain gravity is applied on soil sample 1, the weight of the mass block 2 can be offset by balance weight 6, i.e. the weight of balance weight 6
Amount is equal to the weight of mass block 2, so that measurement result is more accurate.
When measurement, drive system output drive signal to coil makes have electric current process in coil, phase interaction between magnet 8
With active force is generated, make 2 movement under force of mass block, twist, so that soil sample and then twists, and is acquired by accelerometer 9
Angular acceleration signal finally obtain resonant frequency.
Since accelerometer 9 itself also has certain weight, measurement result also will affect to a certain extent, therefore make
To improve, mass block 2 further includes a clump weight 10, the weight of the clump weight 10 and being equal in weight for accelerometer 9, clump weight
10 and accelerometer 9 be symmetricly set on cross 7 by symmetry axis of the axis of mass block, accelerometer 9 can be balanced
Weight.
Vertical displacement sensor (not shown) is further respectively had on the cross 7 of mass block 2 and acceleration transducer (is not schemed
Show), acceleration transducer is fixed on the edge of mass block 2, and the vertical displacement sensor is for detecting mass block 2 in vertical direction
On displacement；Acceleration transducer is used to detect horizontal angular acceleration when soil sample 1 vibrates.Horizontal angular acceleration and vertical position
Shifting is available for user as reference.
Referring to Fig. 7, since soil sample would generally contain moisture, inevitable moisture flow to 1 bottom of holding shell, is especially shaking
During dynamic, moisture can be separated from soil sample, thus be respectively equipped with a permeable stone 13 in the bottom and top of soil sample 1,
Soil sample resonance column device further includes drainpipe 14, the permeable stone at the top of soil sample is fixed on mass block center, soil sample
Bottom permeable stone it is fixed on the base, two permeable stones are all connected with a drainpipe, and drainpipe by the bottom of pedestal to
Outside connection.
Venthole, the gas source outside venthole connection are equipped on plexiglass box 12.External gas source passes through logical
Stomata is passed through to plexiglass box 12, to simulate the local atmospheric pressure in soil sample place, so that measurement is more accurate.
It will be apparent to those skilled in the art that can make various other according to the above description of the technical scheme and ideas
Corresponding change and deformation, and all these changes and deformation all should belong to the protection scope of the claims in the present invention
Within.
Claims (7)
1. soil sample resonate column device, which is characterized in that including pedestal, soil sample, mass block, steel cable, pulley blocks, balance weight,
Charge amplifier and drive system, wherein mass block includes cross, bar magnet, accelerometer and clump weight, and the 4 of cross
Bar magnet is fitted on a end, the both ends of each bar magnet are all arranged with coil；Clump weight is fixed on cross, is matched
The weight of pouring weight and being equal in weight for accelerometer, and clump weight and accelerometer are that symmetrical axial symmetry is set with the axis of mass block
It sets；The bottom end of soil sample is fixed on the base, and top is connect with mass block center；One end of steel cable and the center of mass block connect
It connects, steel cable is set around pulley blocks, and the other end of steel cable is connect with balance weight, and the weight of the balance weight is used to offset the weight of mass block
Amount；The drive system output drive signal makes have electric current process in coil, coil generates torque magnetic field, so that magnetic to coil
It interacts between iron and generates active force, make mass block movement under force, twist, so that soil sample and then twists, and by adding
Speedometer acquires angular acceleration signal, and angular acceleration signal is converted into voltage by charge amplifier, and is delivered to recorder
In.
The column device 2. soil sample as described in claim 1 resonates, which is characterized in that be additionally provided with above the mass block vertical
Displacement sensor, the vertical displacement sensor is for detecting displacement of the soil sample in vibration processes.
The column device 3. soil sample as described in claim 1 resonates, which is characterized in that be equipped at the radial edges of the cross
Acceleration transducer, the acceleration transducer are used to detect angular acceleration when soil sample vibration.
The column device 4. soil sample as described in claim 1 resonates, which is characterized in that distinguish the top and bottom of the soil sample
Equipped with a permeable stone, the permeable stone at the top of soil sample is fixed on mass block center, and the permeable stone of the bottom of soil sample is fixed
On the base, two permeable stones are all connected with a drainpipe, and drainpipe is connected to by the bottom of pedestal to outside.
The column device 5. soil sample as described in claim 1 resonates, which is characterized in that soil sample resonance column device further includes organic
Glass container, the soil sample, mass block, steel cable, pulley blocks and balance weight are respectively positioned in plexiglass box.
The column device 6. soil sample as claimed in claim 5 resonates, which is characterized in that the plexiglass box is equipped with ventilation
Hole, the venthole connection outside gas source.
The column device 7. soil sample as described in claim 1 resonates, which is characterized in that the pulley blocks are with flowering structure one to knot
Any one structure in structure three:
Structure one: pulley blocks include a fixed pulley, and the other end of the steel cable draws after being set around the fixed pulley from the fixed pulley
It is extremely connect out with balance weight；
Structure two: pulley blocks include the first fixed pulley and the second fixed pulley, and it is fixed that the other end of the steel cable is successively set around first
It leads to after pulley, the second fixed pulley from the second fixed pulley and is connect with balance weight；
Structure three: pulley blocks include the first fixed pulley, the second fixed pulley and third fixed pulley, the first fixed pulley and the second fixed pulley
In same horizontal line, third fixed pulley is located at the top of the first fixed pulley and the second fixed pulley, and the steel cable is with S font
Track is led to and balance weight company after being successively set around the first fixed pulley, the second fixed pulley and third fixed pulley from third fixed pulley
It connects.
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 |
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| CN105928774A CN105928774A (en) | 2016-09-07 |
| CN105928774B true CN105928774B (en) | 2019-08-23 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109001034A (en) * | 2018-08-10 | 2018-12-14 | 同济大学 | A kind of test method damped after Damage for Brittle Material |
| CN113790982B (en) * | 2021-07-30 | 2024-03-29 | 南华大学 | Pile-unsaturated soil interface friction visualization test device and method |
| CN114252214B (en) * | 2021-12-23 | 2022-08-30 | 中国矿业大学 | Constant pressure experiment-based pressure balance valve leakage amount detection device and method |
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| KR20130011003A (en) * | 2011-07-20 | 2013-01-30 | 한국수자원공사 | Resonant column testing apparatus with image-based analysis system for deformation modes of specimen using high speed camera |
| CN103760241A (en) * | 2014-01-11 | 2014-04-30 | 吉林大学 | Shipborne resonant column instrument |
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2016
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| KR20130011003A (en) * | 2011-07-20 | 2013-01-30 | 한국수자원공사 | Resonant column testing apparatus with image-based analysis system for deformation modes of specimen using high speed camera |
| CN103760241A (en) * | 2014-01-11 | 2014-04-30 | 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 |
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| Equipment effects on dynamic properties of soils in resonant column testing;Soheil Moayerian et al.;《2011 Pan-Am CGS Geotechnical Conference》;20111231;第1-8页 |
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