CN202351181U - Dynamic measuring system for visible meso-structure of small-scale vibration table - Google Patents
Dynamic measuring system for visible meso-structure of small-scale vibration table Download PDFInfo
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- CN202351181U CN202351181U CN2011205112382U CN201120511238U CN202351181U CN 202351181 U CN202351181 U CN 202351181U CN 2011205112382 U CN2011205112382 U CN 2011205112382U CN 201120511238 U CN201120511238 U CN 201120511238U CN 202351181 U CN202351181 U CN 202351181U
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Abstract
The utility model discloses a dynamic measuring system for a visible meso-structure of a small-scale vibration table. The dynamic measuring system comprises a motor, an eccentric wheel, a vibration table base, a model box, a high-definition digital camera, a high-speed meso-camera and an auxiliary light source. The motor is provided with a driving belt wheel; the eccentric wheel is provided with a driven belt wheel; the driving belt wheel is connected with the driven belt wheel through a belt; the eccentric wheel is connected with the vibration table base through a connecting rod; a wheel with a groove is arranged below the vibration table base; the wheel and a convex guide rail at the bottom of the wheel are in point contact; the model box is arranged on the vibration table base; the front surface and back surface of the model box are made of transparent organic glass; one of the two surfaces is provided with the high-speed meso-camera for observing sand through the transparent organic glass on the surface and the auxiliary light source; and the other surface is provided with the high-definition digital camera for observing the sand through the transparent organic glass on the other surface. By utilizing the dynamic measuring system provided by the utility model, not only can the macro-mechanical quantity variation, such as a stress stain of a soil sample be tested, but also the variations of a soil mass meso-structure can be directly and dynamically observed.
Description
Technical field
The test apparatus that the utility model relates to a kind of soil body when intending sinusoidal dynamic load function dynamic observes the microscopical structure and the macroscopic property of the soil body, the visual microscopical structure dynamic measurement system of small vibrating platform that particularly the sand microscopical structure is dynamic observed and writes down.
Background technology
Experimental study to sand liquefaction mainly contains moving triaxial test, moving simple shear apparatus test, moving torsion shear apparatus test, shaketalle test and power centrifuge test.Test in the past is mainly from macroscopical experimental phenomena research such as excess pore water pressure, soil layer acceleration responsive and soil layer displacement sand liquefaction macroscopic view mechanism.The particle aggregate that soil is made up of Particulate Medium, the variation of soil body microstructure is the real internal cause that causes soil body macromechanics proterties under the external load effect, and existing testing equipment is difficult in the variation that monitors soil body particle microstructure in the process of the test.The utility model fabrication and processing small vibrating platform and Visualization Model case; And designed one and overlapped dynamic synchronization microscopical structure measuring system; But utilize sand liquefaction under the effect of its synchronous dynamic record oscillatory load take place with evolution in the variation of fine particles sight structure; Through thin sight Image Information Processing technology sand is carried out in thin sight observation area and carefully see fabric analysis, disclose the grand thin sight mechanism of sand liquefaction under the 1g gravity field condition.
Summary of the invention
In order to fill up the blank that to observe sand liquefaction moment movement of particles characteristic and carefully sight group of liquefaction process structure develop in the existing research equipment; The purpose of the utility model is to provide a kind of small vibrating platform visual microscopical structure dynamic measurement system; The soil body receives to be intended the sine excitation masterpiece time spent; Can not only record the variation of macro-stress strain, can dynamic observe the microscopical structure of the soil body and record simultaneously.
In order to reach above purpose, the technical scheme that the utility model adopts is following:
The visual microscopical structure dynamic measurement system of a kind of small vibrating platform; Involving vibrations platform and recording geometry, shaking table comprise motor, eccentric wheel and shaking table base, and motor is provided with driving pulley; Eccentric wheel is provided with negative pulley wheel, is connected by belt between driving pulley and the negative pulley wheel; Eccentric wheel links to each other with the shaking table base through connecting rod, and shaking table base below is provided with a wheel of band groove, and wheel contacts with the convex guide rail point of bottom; Recording geometry model casing, high definition digital camera, thin video camera and the secondary light source seen of high speed; Model casing places on the shaking table base; Transparent organic glass is adopted on the two sides, front and back of model casing; One side is provided with the high speed of sand being observed through this face transparent organic glass and carefully sees video camera and secondary light source, and another side is provided with the high definition digital camera of sand being observed through this another side transparent organic glass.
Said power of motor is three phase alternating current motor and the cycloidal planetary gear speed reducer of 3kw.
Said driving pulley and negative pulley wheel are respectively equipped with three belt grooves that vary in size, and belt switches between the different slots of driving pulley and negative pulley wheel 2 can obtain 1Hz, 2Hz and three kinds of horizontal vibration frequencies of 3Hz respectively.
Said eccentric wheel is slotted at crank disk.
Said convex guide rail adopts through heat treated steel processing and fabricating and forms, and the surface is through polishing smooth processing, and installation process adopts levelling pole to carry out leveling.
Said high speed is carefully seen the video camera employing and is bolted on the sidewall of model casing.
Said survey secondary light source adopts industrial LED annular light source.
Said model casing inside dimension is 660mm * 640mm * 680mm, and it is the transparent organic glass of 20mm that thickness is all selected on the two sides, front and back for use, and bottom, model casing left and right side is provided with four draining valves.
The position of the thin sight observation of said transparent organic glass is provided with three blocks of tempered glass.
Owing to adopt technique scheme; The present invention has following beneficial effect: realized that soil sample does the time spent receiving exciting force; The macromechanics quantitative changeizations such as ess-strain of soil sample not only can be tested, and the variation of soil body microscopical structure can be observed intuitively dynamically; And the utlity model has that test is easy, test findings is directly perceived, can carry out the characteristics that the overall process of soil sample dynamic observes.
Description of drawings
Fig. 1 is the small vibrating platform front view (FV) of the utility model.
Fig. 2 is the small vibrating platform outboard profile of the utility model.
Fig. 3 is the small vibrating platform planimetric map of the utility model.
Fig. 4 is the small vibrating platform theoretical acceleration numerical value figure of the utility model.
Fig. 5 is the small vibrating platform actual measurement acceleration value figure of the utility model, and wherein AH1 is a horizontal accelerometer.
Embodiment
The small vibrating platform system of the utility model; Comprise three phase alternating current motor 3, eccentric wheel 4 and shaking table base 5; Three phase alternating current motor 3 is provided with driving pulley 8; Eccentric wheel 4 is provided with negative pulley wheel 12, connected by belt between driving pulley 8 and the negative pulley wheel 12, thereby three phase alternating current motor 3 can drive eccentric wheel 4; Eccentric wheel 4 links to each other with shaking table base 5 through connecting rod 9; Shaking table base 5 belows are provided with the wheel 10 of 4 band grooves; Wheel 10 contacts with 11 of the convex guide rails of bottom, thereby connecting rod 9 can drive 5 periodic motions of shaking table base, simulated earthquake load; Friction force when wherein, contact can effectively reduce the shaking table to-and-fro movement.Preferably, the three phase alternating current motor 3 in the utility model is as power resources, and selecting power for use is that motor and the cycloidal planetary gear speed reducer of 3kw is 120r/min to obtain output speed.Driving pulley 8 is respectively equipped with three belt grooves that vary in size with 12 of negative pulley wheels, and belt switches between the different slots of driving pulley 8 and negative pulley wheel 12 can obtain 1Hz, 2Hz and three kinds of horizontal vibration frequencies of 3Hz respectively.Eccentric wheel 4 makes the adjustable size of crank length R value through at the crank disk fluting, and its range of adjustment is 20mm-100mm; Adopt screw rod can realize the stepless adjustment of radius R value, can be according to the amplitude of test needs continuous transformation horizontal vibration platform.Shaking table base 5 adopts 8 bugle steel to be welded.Convex guide rail 11 adopts through heat treated steel processing and fabricating and forms, and the surface is through polishing smooth processing, and installation process adopts levelling pole to carry out leveling, reduces the influence of 11 pairs of table vibration of convex guide rail as far as possible.
Recording geometry comprises model casing 6, high definition digital camera, thin video camera 1 and the observation secondary light source 2 seen of high speed; Model casing 6 places on the shaking table base 5 of small vibrating platform system; Transparent organic glass is adopted on the two sides, front and back of model casing 6, and thin at a high speed sight video camera and observation secondary light source 2 can be fixed in the sidewall of model casing 6, see through preceding (back) face organic glass sand is observed; Then (preceding) face organic glass place in back establishes the high definition digital camera, simultaneously sand is observed.Preferably, the employing that the high speed of the utility model is carefully seen video camera 1 is bolted on the sidewall of model casing 6, is connected firmly; Effectively avoided applying rocking of video camera in the process at oscillatory load, adopted bolt to connect the position that very convenient mobile high speed is carefully seen video camera 1, the sand microscopical structure that can observe diverse location changes; It takes frame per second is that 90 frame/seconds, (such as by the custom-designed video camera of Japanese JAI company, be of a size of 44x29x75 (mm), focal length was 90mm; Aperture Range: F4.5-F22C; Valid pixel is 656x 494, and the full the highest filming frequency of pixel was 90 frame/seconds, and electronic shutter is 1/90 second-1/10000 second; Other joins the Japanese computar change times camera lens MLM3X-MP of company, and the maximum magnification of this camera lens is: 0.3X-1X, and aperture ratio is 1: 4.5, focal length is 90mm, Aperture Range: F4.5-F22C; ), can photograph the clear sheet of carefully taking into consideration of basic reflection sand movement of particles characteristic requirement at short notice, can dynamic observe and the variation characteristic of quantitative test soil body microscopical structure under dynamic load function.Observation secondary light source 2 adopts industrial LED annular light source, and high bright and stable light source is provided, and guarantees that the thin video camera 1 of seeing of high speed photographs distinct image in short exposure time.Model casing 6 inside dimensions are 660mm * 640mm * 680mm; It is the transparent organic glass of 20mm that thickness is all selected on two sides, model casing 6 front and back for use; Be provided with four draining valves in bottom, model casing 6 left and right sides, if adopt the sample preparation of aerial knockout method, four draining valves can be used as water inlet pipe; Free-water level slowly rises to the top from the bottom, processes the higher sample of saturation degree.Because the two sides, front and back of model casing 6 is a transparent organic glass, one side is taken the sand liquefaction photomacrograph through the high definition digital camera, the macroscopical liquefaction phenomenon in the observation liquefaction incidence and development process; Another side is carefully seen image through carefully seeing video camera 1 Real-time and Dynamic record sand movement of particles at a high speed, discloses sand liquefaction mechanism from thin sight aspect.Because the organic glass wearing quality is relatively poor; May scratch after the test of many times; Thereby have influence on the shooting effect of thin sight image; So carefully three wearing qualities tempered glass 7 preferably is set the position of observation at needs, carefully sight group of the particle structure that writes down saturated sand stratum diverse location in the process of the test respectively changes.
Fig. 4 and Fig. 5 are respectively small vibrating platform theoretical acceleration and actual measurement acceleration, and relatively actual measurement is found with the theoretical acceleration curve, and " spine " shape crest and trough have appearred in the actual measurement accelerating curve, and the theoretical acceleration curve peak phase show smoother.The acceleration peak value of Fig. 5 actual measurement is removed the outer most of 0.23g that is of individual values, and bigger by 9.52% than theoretical acceleration, the design that the small vibrating platform is described is rational, and satisfies the qualitative examination requirement of test.
In the process of the test; Open observation secondary light source 2, change, and transmit automatically and be stored in the computing machine by the thin video camera 1 omnidistance sand microscopical structure of dynamically taking in of seeing at a high speed; The digital picture photo of intercepting some particular moment in shooting with video-corder video recording; Importing digital image microscopical structure analytic system when obtaining soil body macroscopic view experimental phenomena, obtains the quantitative evolution statistics of carefully sight group of sand particle structure parameter.
Below in conjunction with the concrete content of the test of Fujian Liquefaction Tests of Standard Sand, the embodiment and the operation steps of the utility model further described.
Process of the test with the contents are as follows:
(1) specimen preparation: test material is the Fujian normal sand, mean grain size 0.34mm, and nonuniformity coefficient 1.542, coefficient of curvature 1.104 belongs to the uniform medium sand of grating.The knockout legal system is equipped with sample in the water, control relative density 40%, and sample preparation is buried the hole during to corresponding height underground and is pressed meter and soil pressure meter, and the sand sample height is 450mm, the thick saturated clay of top layer covering one deck 50mm.
(2) connect and good each acquisition instrument of debugging, with the strain gauge transducer preheating of switching on, the hole presses the meter should be fixed in each test rower that advances, and guarantees that test result satisfies linear requirement, drift do not occur.The accelerometer Acquisition Instrument configures storing path and SF.
(3) install thin at a high speed video camera 1 and the unlatching observation secondary light source 2 seen, focusing makes thin at a high speed sight video camera 1 can photograph particle image clearly.Fix and set up high definition digital camera and lamp source at the opposite side of model casing 6, debugged camera, through the computer control camera shutter and set shooting interval.Guarantee that camera is perpendicular to the model casing side.
(4) adopt stopwatch to carry out timing in the experimentation.It is consistent with the cut-in time of acceleration Acquisition Instrument to adjust dynamic collecting instrument simultaneously, to help the lateral comparison of test on the same group.
(5) before applying oscillatory load, check comprehensively whether an all appts job is normal.After all preliminary works are all accomplished, open thin at a high speed sight video camera and begin to gather thin sight image, apply oscillatory load, write down test period with stopwatch.Guarantee that all appts begins image data simultaneously.
(6) after the off-test, in time preserve data by each test number, the wash clean model casing, the hole presses meter to be immersed in the water, so that test next time.
(7) digital image analysis: the digital picture photo of intercepting some particular moment (for example from shoot with video-corder video recording; Before the liquefaction, when liquefying, after the liquefaction); With these photo importing digital image microscopical structure analytic systems, analyze the quantitative evolution statistical law that obtains carefully sight group structure parameter.
The technical parameter of this instance is following:
1, soil sample condition: can accomplish silt, sand, contain the grand thin sight test of homogeneous soil sample such as powder sand and stratified soil, can accomplish undisturbed sample and the grand thin sight test of reinventing sample.
2, apply exciting force: the exciting waveform that the bottom applies can be adjusted oscillation intensity through adjustment R value, and through changing combination adjustment excited frequency 1Hz, 2Hz and the 3Hz of belt pulley.
3, apply history: can simulate various loadings history, shake again little shake greatly such as big again shake of little shake earlier or elder generation;
4, the microscopical structure of soil sample observation: through to improvement to the small vibrating platform; At the clear glass sidewall the thin at a high speed video camera exploitation tele-control system of seeing is installed; Can Real-time and Dynamic shoot with video-corder the microscopical structure variation of testing the overall process soil sample, can analyze the quantitative evolution rule that obtains each main thin sight group structure parameter of sand particle in conjunction with digital picture microscopical structure analytic system.
More than show and described the advantage of ultimate principle, principal character and the utility model of the utility model.The technician of the industry should understand; The utility model does not receive the restriction of above-mentioned instance; The principle of describing in above-mentioned instance and the instructions that the utility model just is described; Under the prerequisite that does not break away from the utility model spirit and scope, the utility model also has various changes and modifications, and these variations and improvement all fall in the utility model scope that requires protection.The utility model requires protection domain to be defined by appending claims and equivalent thereof.
Claims (9)
1. visual microscopical structure dynamic measurement system of small vibrating platform; It is characterized in that: involving vibrations platform and recording geometry; Shaking table comprises motor, eccentric wheel and shaking table base; Motor is provided with driving pulley, and eccentric wheel is provided with negative pulley wheel, is connected by belt between driving pulley and the negative pulley wheel; Eccentric wheel links to each other with the shaking table base through connecting rod, and shaking table base below is provided with a wheel of band groove, and wheel contacts with the convex guide rail point of bottom; Recording geometry model casing, high definition digital camera, thin video camera and the secondary light source seen of high speed; Model casing places on the shaking table base; Transparent organic glass is adopted on the two sides, front and back of model casing; One side is provided with the high speed of sand being observed through this face transparent organic glass and carefully sees video camera and secondary light source, and another side is provided with the high definition digital camera of sand being observed through this another side transparent organic glass.
2. the visual microscopical structure dynamic measurement system of small vibrating platform as claimed in claim 1 is characterized in that: said power of motor is three phase alternating current motor and the cycloidal planetary gear speed reducer of 3kw.
3. the visual microscopical structure dynamic measurement system of small vibrating platform as claimed in claim 1; It is characterized in that: said driving pulley and negative pulley wheel are respectively equipped with three belt grooves that vary in size, and belt switches between the different slots of driving pulley and negative pulley wheel can obtain 1Hz, 2Hz and three kinds of horizontal vibration frequencies of 3Hz respectively.
4. the visual microscopical structure dynamic measurement system of small vibrating platform as claimed in claim 1, it is characterized in that: said eccentric wheel is slotted at crank disk.
5. the visual microscopical structure dynamic measurement system of small vibrating platform as claimed in claim 1; It is characterized in that: said convex guide rail adopts through heat treated steel processing and fabricating and forms; The surface is through polishing smooth processing, and installation process adopts levelling pole to carry out leveling.
6. the visual microscopical structure dynamic measurement system of small vibrating platform as claimed in claim 1 is characterized in that: said high speed is carefully seen the video camera employing and is bolted on the sidewall of model casing.
7. the visual microscopical structure dynamic measurement system of small vibrating platform as claimed in claim 1 is characterized in that: said survey secondary light source adopts industrial LED annular light source.
8. the visual microscopical structure dynamic measurement system of small vibrating platform as claimed in claim 1; It is characterized in that: said model casing inside dimension is 660mm * 640mm * 680mm; It is the transparent organic glass of 20mm that thickness is all selected on the two sides, front and back for use, and bottom, model casing left and right side is provided with four draining valves.
9. the visual microscopical structure dynamic measurement system of small vibrating platform as claimed in claim 1 is characterized in that: the position of the thin sight observation of said transparent organic glass is provided with three blocks of tempered glass.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011205112382U CN202351181U (en) | 2011-12-09 | 2011-12-09 | Dynamic measuring system for visible meso-structure of small-scale vibration table |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011205112382U CN202351181U (en) | 2011-12-09 | 2011-12-09 | Dynamic measuring system for visible meso-structure of small-scale vibration table |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103866736A (en) * | 2014-03-29 | 2014-06-18 | 中国矿业大学(北京) | Physical simulation testing system and method for influences of mine earthquake on coal mine underground reservoir |
| CN104952346A (en) * | 2015-06-29 | 2015-09-30 | 同济大学 | Model casing for researching influences of shear strain history on sand liquefaction characteristics |
| CN108179767A (en) * | 2017-12-18 | 2018-06-19 | 济南大学 | A kind of experimental rig and method for visualizing subway station and section liquefaction uplifting |
| CN109060646A (en) * | 2018-09-03 | 2018-12-21 | 山东大学 | Micromachine shaketalle test device and method suitable for weak Sand Liquefaction Analysis |
| CN109323833A (en) * | 2018-11-06 | 2019-02-12 | 重庆大学 | A kind of shake table model case apparatus based on transparent soil |
| CN111024346A (en) * | 2019-12-16 | 2020-04-17 | 北京科技大学 | A analogue test device for tailing storehouse vibration unstability analysis |
-
2011
- 2011-12-09 CN CN2011205112382U patent/CN202351181U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103866736A (en) * | 2014-03-29 | 2014-06-18 | 中国矿业大学(北京) | Physical simulation testing system and method for influences of mine earthquake on coal mine underground reservoir |
| CN103866736B (en) * | 2014-03-29 | 2015-10-28 | 中国矿业大学(北京) | The shake of a kind of ore deposit is on the physical simulation experiment system and method for coal mine underground reservoir impact |
| CN104952346A (en) * | 2015-06-29 | 2015-09-30 | 同济大学 | Model casing for researching influences of shear strain history on sand liquefaction characteristics |
| CN108179767A (en) * | 2017-12-18 | 2018-06-19 | 济南大学 | A kind of experimental rig and method for visualizing subway station and section liquefaction uplifting |
| CN109060646A (en) * | 2018-09-03 | 2018-12-21 | 山东大学 | Micromachine shaketalle test device and method suitable for weak Sand Liquefaction Analysis |
| CN109323833A (en) * | 2018-11-06 | 2019-02-12 | 重庆大学 | A kind of shake table model case apparatus based on transparent soil |
| CN111024346A (en) * | 2019-12-16 | 2020-04-17 | 北京科技大学 | A analogue test device for tailing storehouse vibration unstability analysis |
| CN111024346B (en) * | 2019-12-16 | 2021-11-12 | 北京科技大学 | A analogue test device for tailing storehouse vibration unstability analysis |
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Granted publication date: 20120725 Termination date: 20151209 |
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