CN106706478A - Particle arching characteristic test device and test method thereof - Google Patents
Particle arching characteristic test device and test method thereof Download PDFInfo
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- CN106706478A CN106706478A CN201611169719.3A CN201611169719A CN106706478A CN 106706478 A CN106706478 A CN 106706478A CN 201611169719 A CN201611169719 A CN 201611169719A CN 106706478 A CN106706478 A CN 106706478A
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- 239000002245 particle Substances 0.000 title claims abstract description 85
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
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Abstract
The invention provides a particle arching characteristic test device and a test method thereof. The test device comprises a height-adjustable platform institution, a perspective mold case mechanism used for accommodating particle samples, a loading mechanism capable of controlling frequency conversion and a levelling support mechanism, wherein the platform mechanism is positioned below the support mechanism; the mold case mechanism is arranged on the platform mechanism; the loading mechanism is arranged on the support mechanism and comprises a loading end; the loading end penetrates through the support mechanism and used for continuously applying dynamic loading to the particle samples; the bottom of the mold case mechanism is provided with dodge gates capable of adjusting opening or folding, and a particle feeding hole is formed between the opened dodge gates so as to ensure particle feeding and arching of the particle samples. The invention researches that under the effect of dynamic load, after a particle system is subjected to arching, a theoretical guide role can be achieved for the problems such as arch effect degradation, invalid microscomic evolution process, gradual change mechanism and degradation and even unavailability of soil arching effect, and furthermore particle displacement and particle contact force changes can be synchronously obtained.
Description
Technical field
The invention belongs to underground engineering experimental technique field, it is related to a kind of particle knot arch characteristic test apparatus and experiment side
Method.
Background technology
Industry is known, and soil arching effect is widely present in underground structure, such as pipe canopy enclosed structure, the vault in underground engineering
Tunnel, friction pile, pile formula roadbed in Geotechnical Engineering etc..Under action of static load, soil arching effect is steady in a long-term, its mechanism of action
Academia and engineering circles have also basically formed common recognition.However, existing engineering and experimental study show, soil arch during by dynamic action
Effect is simultaneously unstable, especially upper thickness of earth covering is smaller, the long-term ringing of dynamic load or instantaneous dynamic load it is larger etc. under the conditions of,
Arching may occur to degenerate or entirely ineffective.At present, soil arching effect is degenerated under dynamic loading, the mechanism of failure is still failed to understand
Really, problems to be solved related to this lacks effective theoretical direction.
With the increasingly complicated and continuous improvement to be gone of engineering safety and durability of underground engineering, soil under dynamic loading
Arching is degenerated, failure mechanism lacks the problem brought and increasingly highlights.By taking high-speed railway subgrade engineering as an example, China《High-speed iron
Road design specification》Middle regulation, ballastless track roadbed settlement after construction builds height without tiny fragments of stone, coal, etc. rail no more than 15mm in soft clay area
Pile net structure roadbed is widely used during road circuit to control settlement after construction.The principle of pile net structure roadbed control subgrade settlement exists
In soil arching effect is internally formed in roadbed using stake, inter-pile soil poor rigidity, while benefiting from the drawing-resistant function of GSZ so that
The larger stake of rigidity turns into arrying main body and load is transferred into bottom supporting course, and foundation soil deformation, control are reduced so as to reach
The purpose of post-construction settlement of subgrade.However, the research for being both related to soil arching effect characteristic in pile net structure roadbed concentrates on Quintic system
Under the conditions of Analysis of Ultimate.Because railway bed receives Train induced load long term, stake net knot under circulation dynamic loading
Soil arching effect can occur to degenerate, even fail in structure roadbed, cause stake effectively to share upper load suffered by inter-pile soil, so that
Subgrade settlement control design case is caused to fail.To having opened the serious area of operation pile net structure roadbed circuit settlement of subgrade disease
Found after Duan Jinhang excavation inspections, it is local the phenomenons such as GSZ fracture, inter-pile soil excess sinking occurred, show soil arching effect
Basic failure.As the international demand that sustainable construction demand and high ferro outlet of the China without tiny fragments of stone, coal, etc. rail track brings increases, stake
Net structure roadbed range of application will more extensively, research circulation dynamic loading under soil arching effect evolution mechanism have instruct stake
The realistic meaning of net structure roadbed design and maintenance timing.
Existing, the research for soil arching effect evolution under circulation dynamic loading is less, and mostly under the conditions of laboratory test
The description of arching evolution phenomenon and its feature, rarely has the research for being related to soil arching effect evolution mechanism under dynamic loading, also difficult
To consider influence of the Long-term Cyclic Loading effect to soil arching effect, cause and still be limited to by the correlation engineering design of dynamic loading
Quintic system amendment or the Empirical Design based on dynamic test rule.Have it is to be designed it is a kind of have can intuitively have an X-rayed, noncontact
The experimental rig and test method of the advantages of measurement, synchronous acquisition internal force and arching morphology evolution.
The content of the invention
To overcome the defect existing for prior art, also, the problem for even failing that can occur to degenerate to soil arching effect
To theoretical direction effect, a kind of particle knot arch characteristic test apparatus and test method are now provided, to study lower of dynamic loading
Plastochondria is tied to form arching degeneration, the thin sight evolutionary process and gradual change mechanism of failure after arch, is also further able to synchronous acquisition particle
Displacement and interparticle contact power change.
To achieve the above object, solution of the invention is：
A kind of particle knot arch characteristic test apparatus are provided first, including adjustable for height platform mechanism, for placing particle examination
The bracket institution of sample and the model draw box mechanism, the load maintainer of controllable frequency conversion and levelling that can have an X-rayed, the platform mechanism
Positioned at the lower section of the bracket institution, on the platform mechanism, the load maintainer is located at described for the model draw box mechanism
On bracket institution, the load maintainer includes loading end, and the loading end is through the bracket institution and to the particle sample
Be continuously applied power loading, the bottom of the model draw box mechanism is provided with the adjustable dodge gate opened or close up, unlatching it is described
Shattering mouthful is formed between dodge gate for the particle sample shattering arching.
Preferably, the model draw box mechanism include casing housing and before and after the casing housing two sides perspective plane
Plate, the casing housing includes side frame plate and underframe plate, and two sections are broken into the middle of the underframe plate and then the activity is formed
Door, two sections of underframe plates are formed by adjustable being connected between the side frame plate and then two sections of underframe plates of bolt respectively
The shattering mouthful, by the link position for adjusting the underframe plate and the side frame plate and then the size for changing the shattering mouthful and
Aperture position, the shattering it is intraoral filled with filling block movable up and down for controlling the keying of the shattering mouthful.
Preferably, the perspective panel is secured by bolts in the side frame plate, and the perspective panel is provided with some seats
Mark reference mark is for the actual translation displacements after the calculating particle sample experiment, rotation displacement and deflection；The underframe
Interval offers some adjustment holes on plate, and the underframe plate is adjusted by the adjustment hole of diverse location and connected with the side frame plate
Fixation is connect, the filling block is concordant with the underframe plate, and being shored under the filling block has journey controller, the journey controller
On the platform mechanism.
Preferably, the platform mechanism includes base and the platform on the base, and the base is flat with described
The bolt and nut for regulation spacing is provided between platform, the platform is by the bolt and nut and coordinates on the platform
Level(l)ing bubble realizes leveling, and the base is fixed in the bottom of the journey controller, and the upper end of the journey controller passes through
The platform is simultaneously contacted in the filling block.
Preferably, the load maintainer includes frequency conversion control unit, motor and crankshaft rod structure, the VFC
Unit is connected with the motor control, and the motor is connected by latch with the crankshaft rod structure, the crankshaft-link rod knot
Structure is fixed on the bracket institution, and Weight plate is elasticly connected with the crankshaft rod structure to form the loading end, institute
State crankshaft rod structure itself and carry out upper and lower piston movement and persistently pressed with to the Weight plate, by changing the Weight plate
Quality carries out different dynamic load amplitudes with to the particle sample, the power of different averages is loaded.
Preferably, the pole of the bracket institution including both sides and the top board of the pole upper end is screwed together in, the top
Plate is provided with adjusting nut with the place of screwing togather of the pole, and the top board is provided with level(l)ing bubble, is coordinated by the adjusting nut
Top board described in the level(l)ing bubble leveling；The crankshaft rod structure includes the connecting rod piston with the motor connection, the company
The lower end of bar piston coordinates latch to be connected with guide rod, and the guide rod is connected by spring with the Weight plate.
The present invention also provides a kind of particle knot arch characteristic test method, comprises the following steps：
According to experiment demand, the geomery of particle sample is processed, and in the coordinate collection section of the particle sample
The heart lays positioning cross cursor；
Adjustable for height platform mechanism is provided, the platform mechanism is arranged in the light wave effective range of photo-elastic instrument, and
Platform mechanism described in leveling；
The model draw box mechanism for placing particle sample and can have an X-rayed is provided, being opened up in the bottom of the model draw box mechanism can
Regulation is opened or the dodge gate that closes up, formed between the dodge gate opened shattering mouthful for the particle sample shattering into
Arch, the model draw box mechanism is installed on the platform mechanism, and load the particle sample；
The bracket institution of levelling is installed in position according to the model draw box mechanism, and by bracket institution leveling；
The load maintainer of controllable frequency conversion is provided, the load maintainer is installed on the bracket institution, described will add
The loading end of mounted mechanism passes through the bracket institution and starts the load maintainer and is continuously applied power with to the particle sample
Loading；
The shattering mouthful is opened, from external observation, makes the particle sample in the top arching of the shattering mouthful；
By noncontact image capturing system log, the particle under power loading effect described in direct access
The evolutionary process of riding chain in sample, is parsed by striped and quantifies contact force suffered by particle；
By noncontact image capturing system log, read the positioning cross light and be marked with the different loads of acquisition
The coordinate of stage particle, the actual translation displacements of the particle sample, rotation position are calculated with reference to the mark of the model draw box mechanism
Move and deform.
Wherein, different parameters particle sample (such as grain shape, size) can be obtained in difference by repeating the above steps
Result of the test under loading mode.
Preferably, install and the process using the model draw box mechanism includes：The model draw box mechanism includes casing housing
And perspective panel, the perspective panel is installed on the front and rear two sides of the casing housing, the casing housing includes side frame
Plate and underframe plate, will be broken into two sections and then form the dodge gate, in interval on the underframe plate in the middle of the underframe plate
Some adjustment holes are offered, the underframe plate is adjusted by the adjustment hole of diverse location and is connected solid with the side frame plate
It is fixed, and then the shattering mouthful is formed between two sections of underframe plates, adjust the link position of the underframe plate and the side frame plate
And then change the size and aperture position of the shattering mouthful, in the shattering it is intraoral filled with filling block movable up and down for
The keying of the shattering mouthful is controlled, in journey controller is shored under the filling block, by the journey controller located at described flat
In platform mechanism, the upper and lower displacement of the filling block is controlled by switching the journey controller.
Preferably, set and the process using the mark of the model draw box mechanism includes：The perspective panel is passed through into spiral shell
Bolt is fixed on the side frame plate, and some coordinate reference basic points are provided with the perspective panel, by relatively more described coordinate reference
Basic point calculates the actual translation displacements after the particle sample experiment, rotation displacement and deflection.
Preferably, install and the process using the load maintainer includes：The load maintainer includes control unit, motor
And crankshaft rod structure, the frequency conversion control unit is connected with the motor control, the motor is passed through into latch and institute
Crankshaft rod structure connection is stated, the crankshaft rod structure is fixed on the bracket institution, in the crankshaft rod structure
Under be elasticly connected with Weight plate to form the loading end, by the crankshaft rod structure itself carry out upper and lower piston movement with
The Weight plate is persistently pressed, different dynamic load width are carried out to the particle sample by changing the quality of the Weight plate
The power loading of value, different averages.
The beneficial effect of particle knot arch characteristic test apparatus of the present invention and test method includes：
Particle displacement and the change of interparticle contact power can be synchronously obtained, so as to can be analyzed by particle displacement and striped parsing
The form gradient of particle arch and its correspondence internal force status development, are analysis high-speed railway pile net structure road under acquisition dynamic loading
The thin sight mechanism that soil arching effect develops in base provides effective test data, and the experimental rig and method are easily operated, repeatability
By force, result data reliability.
Brief description of the drawings
Fig. 1 is the positive structure schematic that particle knot of the present invention encircles characteristic test apparatus；
Fig. 2 is the sectional structure schematic views of Section A-A in corresponding diagram 1；
Fig. 3 is the side structure schematic diagram of corresponding diagram 1；
Fig. 4 is the sectional structure schematic views of section B-B in corresponding diagram 3；
Fig. 5 is the overlooking the structure diagram of experiment platform mechanism and model draw box mechanism in corresponding diagram 1；
Fig. 6 is the overlooking the structure diagram of load maintainer in corresponding diagram 1；
Fig. 7 is the workflow schematic diagram that particle knot of the present invention encircles characteristic test method.
Specific embodiment
The present invention is further illustrated below in conjunction with accompanying drawing illustrated embodiment.
With reference to shown in Fig. 1 to Fig. 6, experimental rig of the present invention include test platform mechanism, model draw box mechanism, particle sample and
Load maintainer, model draw box mechanism is installed on test platform mechanism, and load maintainer bearing is installed on ground and is loaded by top and set
It is standby that vertical dynamic load is applied to model casing endoparticle sample.Wherein, specifically：
Test platform mechanism includes base platform 1, bolt and nut 2, experiment footstock platform 3, level(l)ing bubble 4 and Stroke Control
Device 5；Footstock platform 3 is connected by bolt and nut 2 with base platform 1, the height adjustable flat-top seat platform of adjusting nut 2；Stroke
Controller 5 is placed in test platform mechanism middle part tapping.
Model draw box mechanism includes U-shaped median septum 6, preceding perspective panel 7, rear perspective panel 24；Perspective panel 24 passes through spiral shell afterwards
Bolt 8 is connected with U-shaped side frame median septum 6, the bottom of U-shaped median septum 6 by bolt 8 be connected with the underframe stick 26 of " one " font from
And formed left and right two sections of dodge gates, between dodge gate fill filling block 25 be placed on journey controller 5 and with model casing in
Bottom surface flushes, so that, Fig. 4 is scrutinized, can be by adjusting the length of " one " font stick 26 or assembling spacing realizes that difference is come to nothing width
(opening is formed i.e. between dodge gate " shattering mouthful 99 "), accordingly needs to adjust the length of filling block 25 (or shattering mouthful 99)
Degree；Preceding perspective panel 7 is fixed on U-shaped median septum 6 by loaded particles sample 9 to object height, filling after finishing by bolt 8
On, four coordinate reference basic points 10 are provided with preceding perspective panel 7.
Load maintainer mainly includes bearing, crankshaft-link rod device 15, motor 18 and control unit 17；Top board 12 passes through nut
13 are connected with pole 11, by observing level(l)ing bubble 14 and the adjustable ceiling of adjusting nut 13；Crankshaft-link rod device 15 passes through spiral shell
Bolt 16 is fixed on top board, and control unit 17 is placed in the plate top surface of crankshaft-link rod device 15, and motor 18 is fixed on control by bolt 19
The top surface of unit 17；Motor 18 is connected by latch 20 with crankshaft-link rod device 15；The top of guide rod 21 is with the mode of latch 27 and bent axle
Linkage piston is connected, and bottom is connected by bolt with spring 22, and spring 22 is connected by helicitic texture with Weight plate 23.
To make power load stabilization, its length, rigidity and Weight plate quality should match, to ensure power loading procedure
Middle Weight plate 23 should all the time with the upper surface of particle sample 9.More preferably, the peak value of added dynamic load is not more than Weight plate
2 times of gravity.
Granular materials and its arching carefully see response under model test apparatus of the present invention can be used to analyze dynamic load function
The photoelastic test research of characteristic；Model casing is placed in before and after photo-elastic instrument between quarter wave plate during experiment.
Fig. 7 is the workflow that particle knot arch characteristic evolution experiment under dynamic load is carried out using above-mentioned experimental rig, with reference to
Fig. 1 to Fig. 7, the specific steps of particle knot arch attribute testing of the present invention include：
(1) according to experiment demand grain shape, dimensioned sample particle 9, and kernel of section cloth is gathered in particle coordinate
Setting position tracking cross；
(2) test platform mechanism is built between the forward and backward quarter wave plate of photo-elastic instrument according to experimental design, adjusting nut 3 is simultaneously
With reference to the footstock 3 of the leveling test platform mechanism of level(l)ing bubble 4, journey controller 5 is installed afterwards.Wherein, the present invention does not limit to
The photoelastic test applied in the present embodiment in itself, also can with other plurality of devices, such as with PIV (Particle Image
Velocimetry, particle image velocimetry), the equipment of the combination such as infrared photography is applicable to the present invention；
(3) U-shaped side frame median septum 6, the rear perspective panel 24 of model draw box mechanism are installed, and " one " is adjusted according to experimental design
The length or spacing of font underframe stick are setting the width of shattering mouthfuls 99；Filling block 25, filling are fixed by bolt 8 for the time being
Grain sample 9, is fixed on U-shaped median septum 6 by bolt 8 by preceding perspective panel 7 afterwards；
(4) journey controller 5 is adjusted, is allowed to be fully contacted with filling block 25, unclamp the bolt of fixed filling block 25；
(5) according to model casing position mounting bracket mechanism 11 to 14, leveling top board 12；Load maintainer is installed again, by spiral shell
Be fixed on electronic crankshaft-link rod device 15 on top board 12 by bolt 16, and piston is adjusted to peak into connection guide 21, spring
22 and Weight plate 23；The length of adjustable springs 22, rigidity, Weight plate quality realize that different dynamic load amplitudes, different averages add
Carry；
(6) motor 18 is fixed on control unit by bolt 19 after placement control unit 17, according to experimental design
Adjustment control unit 17 starts motor 18 and initial samples is entered with action edge loading to set the rotating speed of motor 18；Adjustable motor turns
Speed realizes that different frequency power is loaded；
(7) opening shattering mouthful 99 according to experimental design makes arching (the particle examination in such as Fig. 4 above dodge gate of particle sample 9
Shown in the bottom of sample 9, the arch blank parts simulated with dotted line), can first stop motor 18 again by adjusting journey controller 5
The filling block 25 of model casing bottom is opened, journey controller 5 can be also adjusted in power loading procedure and is opened filling block 25；
(8) by noncontact image capturing system log, particle sample 9 under direct access dynamic load function
The evolutionary process of middle riding chain, is parsed by striped and quantifies contact force suffered by particle；
(9) by noncontact image capturing system log, read the default tracking cross of grain section and obtain not
With the coordinate of load stage particle, particle reality is calculated with reference to the reference mark 10 on primary particles coordinate and preceding perspective panel 7
Translation displacements, rotation displacement and deformation.
Wherein, different parameters particle sample (such as grain shape, size) can be obtained not by repeat step (1) to (9)
With the result of the test under loading mode.
In the present embodiment, " noncontact image capturing system " needs to be selected according to the concrete condition and purpose of experiment
And parameter configuration, such as acquisition means, frequency, method will match with sample and its response characteristic under dynamic load.Should be " non-to connect
Tactile image capturing system " and " striped parsing " are known technology means.
After completing above-mentioned implementation process, following characteristics of the invention should be able to be embodied：
The experimental rig and photoelastic test method, can synchronously obtain different dynamic load amplitudes, average, under different loading frequencies
Particle displacement and interparticle contact power change, so as to can be analyzed by particle displacement and striped parsing lower of dynamic loading of acquisition
Grain arch form gradient and its correspondence internal force status development, be analysis high-speed railway pile net structure roadbed in soil arching effect develop
Thin mechanism of seeing provides effective test data.
The above-mentioned description to embodiment is to be understood that and apply this hair for ease of those skilled in the art
It is bright.Person skilled in the art obviously easily can make various modifications to these embodiments, and described herein
General Principle is applied in other embodiment without by performing creative labour.Therefore, the invention is not restricted to above-described embodiment,
Those skilled in the art's announcement of the invention, does not depart from improvement that scope made and modification all should be in this hair
Within bright protection domain.
Claims (10)
1. a kind of particle knot encircles characteristic test apparatus, it is characterised in that：Including adjustable for height platform mechanism, for placing particle examination
The bracket institution of sample and the model draw box mechanism, the load maintainer of controllable frequency conversion and levelling that can have an X-rayed, the platform mechanism
Positioned at the lower section of the bracket institution, on the platform mechanism, the load maintainer is located at described for the model draw box mechanism
On bracket institution, the load maintainer includes loading end, and the loading end is through the bracket institution and to the particle sample
Be continuously applied power loading, the bottom of the model draw box mechanism is provided with the adjustable dodge gate opened or close up, unlatching it is described
Shattering mouthful is formed between dodge gate for the particle sample shattering arching.
2. particle knot according to claim 1 encircles characteristic test apparatus, it is characterised in that：The model draw box mechanism includes case
External frame and before and after the casing housing two sides perspective panel, the casing housing includes side frame plate and underframe
Plate, is broken into two sections and then forms the dodge gate in the middle of the underframe plate, two sections of underframe plates are adjustable by bolt respectively
Section is connected between the side frame plate and then two sections of underframe plates and forms the shattering mouthful, by adjusting the underframe plate and institute
The link position for stating side frame plate and then the size and aperture position that change the shattering mouthful, the shattering are intraoral filled with can be upper and lower
The filling block of activity is for the keying of the control shattering mouthful.
3. particle knot according to claim 2 encircles characteristic test apparatus, it is characterised in that：The perspective panel passes through bolt
The side frame plate is fixed on, after the perspective panel is provided with some coordinate reference basic points for calculating the particle sample experiment
Actual translation displacements, rotation displacement and deflection；Interval offers some adjustment holes on the underframe plate, and the underframe plate leads to
The adjustment hole regulation for crossing diverse location is connected with the side frame plate, and the filling block is concordant with the underframe plate, institute
To state shore under filling block and have journey controller, the journey controller is on the platform mechanism.
4. particle knot according to claim 3 encircles characteristic test apparatus, it is characterised in that：The platform mechanism includes base
And the platform on the base, the bolt and nut for regulation spacing is provided between the base and the platform, it is described
Platform is by the bolt and nut and coordinates the level(l)ing bubble on the platform to realize leveling, the bottom of the journey controller
The base is fixed at end, and the upper end of the journey controller passes through the platform and contacts in the filling block.
5. particle knot according to claim 1 encircles characteristic test apparatus, it is characterised in that：The load maintainer includes frequency conversion
Control unit, motor and crankshaft rod structure, the frequency conversion control unit are connected with the motor control, and the motor passes through
Latch is connected with the crankshaft rod structure, and the crankshaft rod structure is fixed on the bracket institution, the crankshaft-link rod
Weight plate is elasticly connected with structure to form the loading end, the crankshaft rod structure itself carry out upper and lower piston movement with
The Weight plate is persistently pressed, different dynamic load width are carried out to the particle sample by changing the quality of the Weight plate
The power loading of value, different averages.
6. particle knot according to claim 5 encircles characteristic test apparatus, it is characterised in that：The bracket institution includes both sides
Pole and be screwed together in the top board of the pole upper end, the top board is provided with adjusting nut with the place of screwing togather of the pole, institute
State top board and be provided with level(l)ing bubble, top board described in the level(l)ing bubble leveling is coordinated by the adjusting nut；The bent axle connects
Bar structure includes the connecting rod piston with the motor connection, and the lower end of the connecting rod piston coordinates latch to be connected with guide rod, described
Guide rod is connected by spring with the Weight plate.
7. a kind of particle knot encircles characteristic test method, it is characterised in that comprise the following steps：
According to experiment demand, the geomery of particle sample is processed, and in the coordinate collection kernel of section cloth of the particle sample
Setting position tracking cross；
Adjustable for height platform mechanism is provided, the platform mechanism is arranged in the light wave effective range of photo-elastic instrument, and leveling
The platform mechanism；
Model draw box mechanism for placing particle sample and can have an X-rayed is provided, opens up adjustable in the bottom of the model draw box mechanism
The dodge gate opened or close up, forms shattering mouthful for the particle sample shattering arching between the dodge gate opened,
The model draw box mechanism is installed on the platform mechanism, and loads the particle sample；
The bracket institution of levelling is installed in position according to the model draw box mechanism, and by bracket institution leveling；
The load maintainer of controllable frequency conversion is provided, the load maintainer is installed on the bracket institution, by the loading machine
The loading end of structure is through the bracket institution and starts the load maintainer to be continuously applied power loading to the particle sample；
The shattering mouthful is opened, from external observation, makes the particle sample in the top arching of the shattering mouthful；
By noncontact image capturing system log, the particle sample under power loading effect described in direct access
The evolutionary process of middle riding chain, is parsed by striped and quantifies contact force suffered by particle；
By noncontact image capturing system log, read the positioning cross light and be marked with the acquisition different load stages
The coordinate of particle, with reference to the model draw box mechanism mark calculate the actual translation displacements of the particle sample, rotation displacement and
Deformation.
8. particle knot according to claim 7 encircles characteristic test method, it is characterised in that install and utilize the model casing
The process of mechanism includes：
The model draw box mechanism includes casing housing and perspective panel, and the perspective panel is installed on into the casing housing
Front and rear two sides, the casing housing includes side frame plate and underframe plate, two sections will be broken into the middle of the underframe plate and then be formed
The dodge gate, offers some adjustment holes, by the underframe plate by described in diverse location in interval on the underframe plate
Adjustment hole regulation is connected with the side frame plate, and then the shattering mouthful is formed between two sections of underframe plates, and regulation is described
Underframe plate and the link position of the side frame plate and then the size and aperture position of the change shattering mouthful, it is intraoral in the shattering
Filled with filling block movable up and down for controlling the keying of the shattering mouthful, in shoring Stroke Control under the filling block
Device, by the journey controller on the platform mechanism, the filling block is controlled by switching the journey controller
Upper and lower displacement.
9. particle knot according to claim 8 encircles characteristic test method, it is characterised in that set and utilize the model casing
The process of the mark of mechanism includes：
The perspective panel is secured by bolts in the side frame plate, some coordinate reference bases are provided with the perspective panel
Point, the actual translation displacements after the particle sample is tested, rotation displacement and change are calculated by relatively more described coordinate reference basic point
Shape amount.
10. particle knot according to claim 7 encircles characteristic test method, it is characterised in that install and utilize the loading
The process of mechanism includes：
The load maintainer includes control unit, motor and crankshaft rod structure, by the frequency conversion control unit and the electricity
Machine control connection, the motor is connected by latch with the crankshaft rod structure, and the crankshaft rod structure is fixed on
On the bracket institution, in being elasticly connected with Weight plate under the crankshaft rod structure to form the loading end, by described
Crankshaft rod structure itself carries out upper and lower piston movement and is persistently pressed with to the Weight plate, by the matter for changing the Weight plate
Measure and carry out different dynamic load amplitudes with to the particle sample, the power of different averages is loaded.
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| CN201611169719.3A CN106706478A (en) | 2016-12-16 | 2016-12-16 | Particle arching characteristic test device and test method thereof |
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| CN111965079A (en) * | 2020-07-16 | 2020-11-20 | 北京科技大学 | Full-automatic ore drawing simulation test device |
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