CN207730762U - A kind of k0Under the conditions of no-Co-alloy steel anisotropy shear wave velocity and relative density joint test experimental rig - Google Patents
A kind of k0Under the conditions of no-Co-alloy steel anisotropy shear wave velocity and relative density joint test experimental rig Download PDFInfo
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- CN207730762U CN207730762U CN201820093407.7U CN201820093407U CN207730762U CN 207730762 U CN207730762 U CN 207730762U CN 201820093407 U CN201820093407 U CN 201820093407U CN 207730762 U CN207730762 U CN 207730762U
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- flexure element
- shear wave
- wave velocity
- relative density
- horizontal direction
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Abstract
The utility model discloses a kind of k0Under the conditions of no-Co-alloy steel anisotropy shear wave velocity and relative density joint test experimental rig, which includes anisotropy flexure element shear wave velocity measurement subsystem, model casing, vertical motion platform, Based on Electro-hydraulic Loading Servo System, reaction frame and load plate；The utility model, to change the relative density of soil sample in model casing, passes through anisotropy flexure element shear wave velocity measurement subsystem testing k using the driving of vertical motion platform0State the soil sample corresponding horizontal direction of difference relative density and vertical shearing velocity of wave when overlying burden is identical overcome a previous sample and generally can only obtain the data point of a relative density and shear wave velocity and the shortcomings of existing testing equipment can not test big grain size no-Co-alloy steel (such as gravel soil) anisotropy shear wave velocity；The experimental rig scope of application is wider, and test is easier, saves manpower and materials, working efficiency is greatly improved.
Description
Technical field
The utility model belongs to soil test field more particularly to a kind of k0Under the conditions of no-Co-alloy steel anisotropy shearing wave
The experimental rig of speed and relative density joint test.
Background technology
Shear wave velocity in soil layer be weigh soil mechanics performance overall target, soilborne plant disease by soil it is structural,
The factors such as void ratio, effective stress, stress history and mode of occurence influence, and also have very strong correlation with anti-liquefying ability,
Therefore shear wave velocity gradually develops into a kind of basic index of Liquefaction.In laboratory test, flexure element, Resonant Column may be used
It is measured with research techniques such as dynamic triaxials, and scene is obtained by the methods of lower opening method, cross hole method knead dough wave analysis.Relative density is
The important indicator of control and evaluation no-Co-alloy steel engineering properties is to construct to be widely used with experimental study in actual engineering design
Soil mechanics concept.It is typically used as weighing the density degree of no-Co-alloy steel, and has considered void ratio, grain shape and particle
The effect of the properties such as grading.It directly affects the anti-liquefying ability of no-Co-alloy steel, is the essence for influencing no-Co-alloy steel mechanical property
Attribute.
In nature, more or less there is variability in natural rock-filled during formation, soil neither isotropic,
Nor homogeneous, but apparent anisotropy is shown, more and more scholars have found the anisotropy pair of cohesiveless soil
Its mechanical property influences notable.Up to now, for k0Influence of the no-Co-alloy steel anisotropy to modulus of shearing is related under state
Research is seldom, therefore the experimental study of necessary development system.
Under the conditions of controlling relative density, the shear wave velocity for studying no-Co-alloy steel is to solve the problems, such as its shear wave velocity Liquefaction
Important technical.For the fine graineds no-Co-alloy steel such as sandy soil, similar research is generally by resonant column device or installation
The triaxial test system for having flexure element configures sample by certain relative density, and then installation consolidation, tests the shearing wave of soil sample
Speed.The shear wave velocity measurement of no-Co-alloy steel tests extensive development, but there are still a little deficiencies in technology and operation for experimental rig：
(1) for model test apparatus in the case where not changing stress condition, a sample generally can only obtain one relatively
The data point of density and shear wave velocity, it is time-consuming and laborious.
(2) gravel soil sample is more than sandy soil sample several times, and existing testing equipment does not support major diameter no-Co-alloy steel shearing wave
The measurement of speed, limits experiment great soil group.
(3) three axis sample sample preparations and test period are long, and test period is of high cost, and equipment is expensive, are unfavorable for carrying out extensive
Experimental study.
(4) model test apparatus cannot test no-Co-alloy steel anisotropy shear wave velocity.
Invention content
The purpose of this utility model is to provide a kind of k0Under the conditions of no-Co-alloy steel anisotropy shear wave velocity with it is relatively close
The experimental rig of joint test is spent, solves existing apparatus in the case where not changing stress condition, a sample soil sample can only obtain
To a relative density and shear wave velocity data point and can not being needed according to research test the larger no-Co-alloy steel of grain size respectively to
The problem of anisotropic shear wave velocity.
The utility model technical solution used for the above purpose is：A kind of k0Under the conditions of no-Co-alloy steel respectively to different
The experimental rig of property shear wave velocity and relative density joint test, including anisotropy flexure element shear wave velocity measurement subsystem,
Model casing, vertical motion platform, Based on Electro-hydraulic Loading Servo System, reaction frame and load plate；
The anisotropy flexure element shear wave velocity measurement subsystem includes that horizontal direction excites flexure element, horizontal direction reception curved
Qu Yuan, it vertically excites flexure element, vertically receive flexure element, function generator, piezoelectric linear amplifier, charge amplifier and oscillography
Device；
The model casing is fixed on vertical motion platform, and soil sample is filled in model casing, load plate is placed at the top of the soil sample；
Reaction frame is supported on the Based on Electro-hydraulic Loading Servo System, it is lower to support load plate；The load plate is by the pressure of Based on Electro-hydraulic Loading Servo System
Soil sample is reached, vertical pressure suffered by soil sample is made to be uniformly distributed；
The vertical excitation flexure element is fixed in the groove of load plate bottom center；The vertical reception flexure element is fixed
In the groove at model casing bottom plate center；The horizontal direction excitation flexure element and horizontal direction receive flexure element and pass through organic glass respectively
Glass casing is fixed on two opposite side walls of model casing, and position face；
The input terminal contiguous function generator of the piezoelectric linear amplifier, output end are divided into three tunnels, the first via and level
It is connected to excitation flexure element, the second tunnel is connected with vertical excitation flexure element, and third road is connected with oscillograph；
The input terminal of the charge amplifier is separately connected horizontal direction and receives flexure element, vertically receives flexure element, output end
Connect oscillograph.
Further, the model casing uses solid aluminium sheet, and uncovered body structure is spliced by bolt；Model casing side
Hoop reinforces aluminium rib, can effectively limit the lateral deformation of sample, ensures sample under condition of high ground stress still in k0State.
Further, the load plate is sandwiched between rib grid using the double-deck aluminium sheet.
Further, the horizontal direction excitation flexure element, horizontal direction receive flexure element, vertically excite flexure element, vertically connect
It receives flexure element outer surface and wraps up epoxy resin, to realize electromagnetic shielding；Terminals are fixed by fluid sealant, no wiring
One end is as free end, in cantilever-shaped insertion soil sample.
Further, it is threeway shape that the piezoelectric linear amplifier, which uses high speed bipolar power amplifier, output end,
Formula；The function generator uses arbitrary-function generator, can generate the wave of the parameters such as different shape, frequency, excitation cycle
Shape, and excitation signal can keep very high precision；The oscillograph uses two-channel digital oscillograph, can be simultaneously to defeated
Enter, output signal carry out high-resolution show, acquisition and storage.
Further, the vertical motion platform uses the vertical motion platform of eccentric rotor excitation.
The utility model has the following advantages compared with prior art：The utility model is using the driving of vertical motion platform to change
The relative density of soil sample in varying model case passes through anisotropy flexure element shear wave velocity measurement subsystem testing k0State soil sample exists
It is general only to overcome a previous sample for the corresponding horizontal direction of difference relative density and vertical shearing velocity of wave when overlying burden is identical
Can obtain the data point of a relative density and shear wave velocity and existing testing equipment can not test big grain size no-Co-alloy steel (such as sand
Gravel soil) anisotropy shear wave velocity the shortcomings of；The experimental rig scope of application is wider, and test method is easier, saves manpower object
Working efficiency is greatly improved in power.
Description of the drawings
Fig. 1 is the structural schematic diagram of utility model device；
Fig. 2 is the model casing detail drawing of utility model device；
In figure, Based on Electro-hydraulic Loading Servo System 1；Vertical motion platform 2；Anisotropy flexure element test subsystems 3；Load plate 4；
Soil sample 5；Organic glass casing 6；The reception flexure element 7 of horizontal direction arrangement；The excitation flexure element 8 of horizontal direction arrangement；Model casing 9；
The reception flexure element 10 being vertically arranged；The excitation flexure element 11 being vertically arranged；Oscillograph 12；Reaction frame 13；Piezoelectric linear amplifies
Device 14；Function generator 15；Reinforce aluminium rib 16；Charge amplifier 17.
Specific implementation mode
The utility model is described in further detail in the following with reference to the drawings and specific embodiments.
As shown in Figure 1, 2, a kind of k provided by the utility model0Under the conditions of no-Co-alloy steel anisotropy shear wave velocity and phase
To the experimental rig of density joint test, including anisotropy flexure element shear wave velocity measurement subsystem 3, model casing 9, vertically shake
Dynamic platform 2, Based on Electro-hydraulic Loading Servo System 1, reaction frame 13 and load plate 4；
The anisotropy flexure element shear wave velocity measurement subsystem 3 includes horizontal direction excitation flexure element 8, horizontal direction reception
Flexure element 7, vertical excitation flexure element 11, vertical reception flexure element 10, function generator 15, piezoelectric linear amplifier 14, charge
Amplifier 17 and oscillograph 12；
The model casing 9 is fixed on vertical motion platform 2, and soil sample 5 is filled in model casing 9, and 5 top of the soil sample, which is placed, to be added
Support plate 4；Reaction frame 13 is supported on the Based on Electro-hydraulic Loading Servo System 1, it is lower to support load plate 4；The load plate 4 is by electro-hydraulic loading
The pressure of system 1 reaches soil sample 5, and vertical pressure suffered by soil sample 5 is made to be uniformly distributed；
The vertical excitation flexure element 11 is fixed in the groove of 4 bottom center of load plate；The vertical reception flexure element
10 are fixed in the groove at 9 bottom plate center of model casing；The horizontal direction excitation flexure element 8 and horizontal direction receive flexure element 7 and distinguish
It is fixed on 9 two opposite side walls of model casing by organic glass casing 6, and position face；
The input terminal contiguous function generator 15 of the piezoelectric linear amplifier 14, output end are divided into three tunnels, the first via with
Horizontal direction excites flexure element 8 to be connected, and the second tunnel is connected with vertical excitation flexure element 11, and third road is connected with oscillograph 12；
The input terminal of the charge amplifier 17 is separately connected horizontal direction and receives flexure element 7, vertical reception flexure element 10, defeated
Outlet connects oscillograph 12.
The model casing 9 uses solid aluminium sheet, and uncovered body structure is spliced by bolt；9 side hoop of model casing adds
Strong aluminium rib 16, can effectively limit the lateral deformation of sample, ensure sample under condition of high ground stress still in k0State.3. piece
According to k described in claim 10Under the conditions of the experiment of no-Co-alloy steel anisotropy shear wave velocity and relative density joint test fill
It sets, it is characterised in that：The load plate 4 is sandwiched between rib grid using the double-deck aluminium sheet.
The horizontal direction excitation flexure element 8, horizontal direction receive flexure element 7, vertical excitation flexure element 11, vertically receive bending
Epoxy resin is wrapped up in first 10 outer surfaces, to realize electromagnetic shielding；Terminals are fixed by fluid sealant, one end of no wiring
As free end, in cantilever-shaped insertion soil sample 5.
It is threeway form that the piezoelectric linear amplifier 14, which uses high speed bipolar power amplifier, output end,；It is described
Function generator 15 uses arbitrary-function generator, can generate the waveform of the parameters such as different shape, frequency, excitation cycle, and
Excitation signal can keep very high precision；The oscillograph 12 use two-channel digital oscillograph, can simultaneously to input, it is defeated
Go out signal carry out high-resolution show, acquisition and storage.
The vertical motion platform that the vertical motion platform 2 is encouraged using eccentric rotor.
By controlling Oscillation Amplitude, frequency and the vibration time of vertical motion platform 2, so that the soil sample 5 in model casing 9 is vibrated and add
It is close, and then soil sample 5 changes relative density under conditions of burden pressure is constant during Control experiment.Anisotropy flexure element is cut
Cut wave velocity testing subsystem 3 vertical motion platform 2 shut down stablize after, accurately the horizontal direction in test model case 9 in soil sample 5 and
Vertical shearing velocity of wave.
The course of work of the utility model is as follows：
Model casing 9 is mounted on the table top of vertical motion platform 2, it is native used in filling test in model casing, by vertically shaking
Dynamic platform 2 prepares molding experimental relationship soil sample 5；Load plate 4, installation horizontal direction excitation flexure element 8, water are placed at 5 top of soil sample
It puts down to flexure element 7, vertical excitation flexure element 11, vertical reception flexure element 10 is received, measures horizontal direction and vertical shearing wave is effective
Propagation distance；Vertical pressure is applied to load plate 4 by Based on Electro-hydraulic Loading Servo System 1, is horizontal direction by function generator 15
Flexure element 8 and vertical excitation flexure element 11 is excited to provide driving pulse voltage signal, by piezoelectric linear amplifier 14 by signal
Amplification, signal divide three road Parallel opertations, the first via to excite the excitation letter of flexure element 8 as horizontal direction from piezoelectric linear amplifier 14
Number, pumping signal of second tunnel as vertical excitation flexure element 11, third road flows to oscillograph 12, is acquired and swashed by oscillograph 12
Encourage signal；Horizontal direction excites flexure element 8 and vertical excitation flexure element 11 to receive pumping signal and generate vibration, and the vibration is to shear
The form of wave be transferred to horizontal direction receive flexure element 7 and it is vertical receive flexure element 10, cause horizontal direction and receive flexure element 7 and vertical
Receive the electric response in flexure element 10；Horizontal direction receives flexure element 7 and the vertical electric response received in flexure element 10
Amplified by charge amplifier 17, amplified reception signal is acquired by oscillograph 12；Pass through pumping signal and reception signal
The time difference of corresponding signal point determines propagation time of the shearing wave in soil sample 5, is effectively passed according to horizontal direction and vertical shearing wave
The horizontal direction and vertical shearing velocity of wave of soil sample 5 can be calculated by broadcasting the propagation time of distance and shearing wave in soil sample 5；Start perpendicular
Change by controlling Oscillation Amplitude and vibration time to shake table 2 and be in k0The relative density of soil sample 5 under state, but do not change
The burden pressure for becoming soil sample 5 measures the vertical displacement of soil sample 5, is counted again according to the vertical displacement of soil sample 5 after shutting down and stablizing
Calculate the relative density of soil sample 5；Measure the shearing of soil sample 5 again by anisotropy flexure element shear wave velocity measurement subsystem 3
Wave propagation time recalculates the horizontal direction and vertical shearing velocity of wave of soil sample 5；Changed by repeating the vibration of vertical motion platform 2
The relative density and anisotropy shear wave velocity measurement subsystem of soil sample 5 measure the process of the shearing wave propagation time of soil sample 5, can
To obtain multigroup soil sample 5 corresponding horizontal direction and vertical shearing velocity of wave data point in different relative densities.
Claims (6)
1. a kind of k0Under the conditions of no-Co-alloy steel anisotropy shear wave velocity and relative density joint test experimental rig, feature
It is：The device includes anisotropy flexure element shear wave velocity measurement subsystem (3), model casing (9), vertical motion platform (2), electricity
Liquid servo loading system (1), reaction frame (13) and load plate (4)；
The anisotropy flexure element shear wave velocity measurement subsystem (3) includes horizontal direction excitation flexure element (8), horizontal direction reception
Flexure element (7), vertically excitation flexure element (11) vertically receive flexure element (10), function generator (15), piezoelectric linear amplifier
(14), charge amplifier (17) and oscillograph (12)；
The model casing (9) is fixed on vertical motion platform (2), filling soil sample (5) in model casing (9), at the top of the soil sample (5)
Place load plate (4)；Reaction frame (13) is supported on the Based on Electro-hydraulic Loading Servo System (1), it is lower to support load plate (4)；The load plate
(4) pressure of Based on Electro-hydraulic Loading Servo System (1) is reached into soil sample (5)；
The vertical excitation flexure element (11) is fixed in the groove of load plate (4) bottom center；The vertical reception flexure element
(10) it is fixed in the groove at model casing (9) bottom plate center；The horizontal direction excitation flexure element (8) and horizontal direction receive flexure element
(7) it is fixed on (9) two opposite side walls of model casing by organic glass casing (6) respectively, and position face；
The input terminal contiguous function generator (15) of the piezoelectric linear amplifier (14), output end are divided into three tunnels, the first via with
Horizontal direction excites flexure element (8) to be connected, and the second tunnel is connected with vertical excitation flexure element (11), third road and oscillograph (12) phase
Even；
The input terminal of the charge amplifier (17) is separately connected horizontal direction and receives flexure element (7), vertically receives flexure element (10),
Output end connects oscillograph (12).
2. k according to claim 10Under the conditions of no-Co-alloy steel anisotropy shear wave velocity and relative density joint test
Experimental rig, it is characterised in that：The model casing (9) uses solid aluminium sheet, and uncovered body structure is spliced by bolt；Model
Case (9) side hoop reinforces aluminium rib (16).
3. k according to claim 10Under the conditions of no-Co-alloy steel anisotropy shear wave velocity and relative density joint test
Experimental rig, it is characterised in that：The load plate (4) is sandwiched between rib grid using the double-deck aluminium sheet.
4. k according to claim 10Under the conditions of no-Co-alloy steel anisotropy shear wave velocity and relative density joint test
Experimental rig, it is characterised in that：The horizontal direction excitation flexure element (8), horizontal direction receive flexure element (7), vertical excitation bending
First (11) vertically receive flexure element (10) outer surface package epoxy resin, and terminals are fixed by fluid sealant, no wiring
One end as free end, in cantilever-shaped insertion soil sample (5).
5. k according to claim 10Under the conditions of no-Co-alloy steel anisotropy shear wave velocity and relative density joint test
Experimental rig, it is characterised in that：The piezoelectric linear amplifier (14) uses high speed bipolar power amplifier, and output end is
Threeway form；The function generator (15) uses arbitrary-function generator；The oscillograph (12) is shown using two-channel digital
Wave device.
6. k according to claim 10Under the conditions of no-Co-alloy steel anisotropy shear wave velocity and relative density joint test
Experimental rig, it is characterised in that：The vertical motion platform (2) uses the vertical motion platform of eccentric rotor excitation.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108344852A (en) * | 2018-01-19 | 2018-07-31 | 浙江大学 | A kind of k0Under the conditions of no-Co-alloy steel anisotropy shear wave velocity and relative density joint test experimental rig and method |
| CN109085039A (en) * | 2018-09-20 | 2018-12-25 | 广西大学 | Prepare the device and preparation method of Ground Penetrating Radar contaminated soil detection simulation test soil sample |
| CN111982745A (en) * | 2020-08-17 | 2020-11-24 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Double-frequency corrected shear wave railway coarse-particle soil roadbed filler density prediction method |
-
2018
- 2018-01-19 CN CN201820093407.7U patent/CN207730762U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108344852A (en) * | 2018-01-19 | 2018-07-31 | 浙江大学 | A kind of k0Under the conditions of no-Co-alloy steel anisotropy shear wave velocity and relative density joint test experimental rig and method |
| CN109085039A (en) * | 2018-09-20 | 2018-12-25 | 广西大学 | Prepare the device and preparation method of Ground Penetrating Radar contaminated soil detection simulation test soil sample |
| CN109085039B (en) * | 2018-09-20 | 2024-04-09 | 广西大学 | Device and method for preparing soil sample for ground penetrating radar polluted soil detection simulation test |
| CN111982745A (en) * | 2020-08-17 | 2020-11-24 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Double-frequency corrected shear wave railway coarse-particle soil roadbed filler density prediction method |
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