CN102749251B - Testing apparatus and research method based on discrete particle gravel cushion damage mode - Google Patents
Testing apparatus and research method based on discrete particle gravel cushion damage mode Download PDFInfo
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- CN102749251B CN102749251B CN201210256639.7A CN201210256639A CN102749251B CN 102749251 B CN102749251 B CN 102749251B CN 201210256639 A CN201210256639 A CN 201210256639A CN 102749251 B CN102749251 B CN 102749251B
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- blotter
- gravel cushion
- steel plate
- discrete particle
- mold
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Abstract
The invention discloses a testing apparatus based on a discrete particle gravel cushion damage mode. The testing apparatus comprises a mold case, a mold pile, a gravel cushion, sandy soil, a displacement measuring dial indicator, a steel plate bearing platform, a loading device and a high resolution digital camera which is used for shooting a gravel cushion image, wherein the mold case is a case body which is open at the upper part; the front face of the case body is a transparent toughened glass; the mold pile is placed in the case body; the sandy soil is arranged in the case body; the height of the sandy soil is that of the top of the mold pile; the gravel cushion is arranged above the sandy soil; the thickness of the gravel cushion is two times larger than the diameter of the mold pile; the steel plate bearing platform is arranged above the gravel cushion; and the loading device and the high resolution digital camera are arranged on the steel plate bearing platform. The invention further discloses a research method based on the discrete particle gravel cushion damage mode. According to the invention, the discrete particle gravel cushion damage mode is researched from a micro aspect; and it very intuitive and visual to analyze a displacement field, a strain field and a shearing zone of gravel cushion particles by using a digital camera measurement technology.
Description
Technical field
The present invention relates to researching and analysing of discrete particle system, particularly a kind of test unit and research method based on discrete particle blotter failure mode.
Background technology
Research blotter failure mode focuses on macromechanics aspect both at home and abroad at present, and the research of microcosmic aspect is in shortcoming state.The research of conventional cushion damage layer pattern is from mechanical mechanism aspect, and at the bottom of mathematics mechanical work that need to be certain, with some spatial thought imagination, therefore image is concrete not.And from microcosmic aspect, study discrete particle blotter failure mode, and utilize Digital photographic measurement technology to analyze displacement field, strain field and the shear zone of bed course particle, very visual pattern, therefore has very important learning value.This is a kind of innovation that the model study of conventional cushion damage layer is proposed, for bed course research blaze a frontier.
Summary of the invention
The object of the invention is, in order to overcome the deficiencies in the prior art, provides a kind of test unit based on discrete particle blotter failure mode.
Another object of the present invention is to provide a kind of research method based on discrete particle blotter failure mode.
The technical solution used in the present invention is: a kind of test unit based on discrete particle blotter failure mode, comprise model casing, Model Pile, blotter, sand, displacement measures dial gauge, steel plate cushion cap, charger and for taking the high-resolution digital camera of blotter picture, described model casing is upper opening casing, casing front is transparent toughened glass, in casing, be placed with Model Pile, in casing, be provided with sand, the height of sand is the height on Model Pile stake top, above sand, be provided with blotter, the thickness of blotter is the twice of Model Pile diameter, above blotter, be provided with steel plate cushion cap, steel plate cushion cap is provided with charger and displacement measures dial gauge.
As preferably, described Model Pile Model Pile adopts solid half module stake.
As preferably, described charger is lifting jack and reaction frame.
The research method based on discrete particle blotter failure mode that adopts above-mentioned test unit, comprises the following steps:
(1) Model Pile is placed in model casing and presses close to transparent toughened glass, when the sample preparation of knockout soil is to position, Model Pile stake top in model casing, stop knockout, and by the upper surface leveling of sand;
(2) on Model Pile stake top, lay the blotter sample preparation of processing through speckle, blotter laying depth is the twice of Model Pile diameter, leveling blotter surface;
(3) then arrange successively steel plate cushion cap and charger, use hydraulic oil pound controlled loading device, on steel plate cushion cap, set up displacement and survey dial gauge measurement load deflection;
(4) before transparent toughened glass, set up high-resolution digital camera, blotter particle in loading procedure is followed the trail of to shooting, utilize the analytical test of image correlation process software to take pictures, blotter particle is carried out to deformation measurement and explanation, analyze bed course failure mode.
Beneficial effect: the research method of bed course failure mode of the present invention comprises test unit, the thin image capturing method of seeing, the thin bed course analytical approach of seeing, from microcosmic aspect, study discrete particle blotter failure mode, utilize Digital photographic measurement technology to analyze displacement field, strain field and the shear zone of bed course particle, very visual pattern, therefore has very important learning value.This is a kind of innovation that the model study of conventional cushion damage layer is proposed, for bed course research blaze a frontier.
Accompanying drawing explanation
Fig. 1 is test unit structural representation of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
As shown in Figure 1, a kind of test unit based on discrete particle blotter failure mode, comprise model casing, Model Pile 1, blotter 2, sand 3, displacement measures dial gauge 4, steel plate cushion cap 6, charger and for taking the high-resolution digital camera of blotter picture, described model casing is upper opening casing, casing front is transparent toughened glass, in casing, be placed with Model Pile 1, in casing, be provided with sand 3, the height of sand 3 is the height on 1 top of Model Pile, sand 3 is provided with blotter 2 above, the thickness of blotter 2 is the twice of Model Pile 1 diameter, blotter 2 is provided with steel plate cushion cap 6 above, steel plate cushion cap 6 is provided with charger and displacement measures dial gauge 4.
The present invention uses indoor model test, and test model case front is the transparent toughened glass that 20mm is thick, and all the other are the steel plate after 10mm on four sides.Lifting jack 5 and reaction frame 7 load are used in test, and casing top is provided with reaction frame 7, for fixing loading facilities.Model Pile 1 adopts solid half module stake, and blotter 2 adopts graded broken stone, covers steel plate cushion cap on blotter 2, during pressurization, by steel plate cushion cap 6, transmits load.
The research method based on discrete particle blotter failure mode that adopts above-mentioned test unit, comprises the following steps:
(1) Model Pile is placed in model casing and presses close to transparent toughened glass, when the sample preparation of knockout soil is to position, Model Pile stake top in model casing, stop knockout, and by the upper surface leveling of sand;
(2) on Model Pile stake top, lay the blotter sample preparation of processing through speckle, blotter laying depth is the twice of Model Pile diameter, leveling blotter surface;
(3) then arrange successively steel plate cushion cap and charger, use hydraulic oil pound controlled loading device, on steel plate cushion cap, set up displacement and survey dial gauge measurement load deflection;
(4) before transparent toughened glass, set up high-resolution digital camera, blotter particle in loading procedure is followed the trail of to shooting, utilize the analytical test of image correlation process software to take pictures, blotter particle is carried out to deformation measurement and explanation, analyze bed course failure mode.
Bed course of the present invention is carefully seen image capturing method: adopt the anti-D700 digital camera of Nikon list (image ultimate resolution is 4256 * 2832) shooting of 1,210 ten thousand effective pixels, 5 Zoom Lens to obtain bed course picture.In general, the resolution of image is higher, and the minimal deformation precision that can identify is higher, thereby can catch the change in displacement that bed course particle is small.The precision that this shooting can reach is about the auxiliary picture pick-up device of 0.1mm/pixel. cold light lamp, tripod, telepilot.In process of the test, the light of each photo can not have too large variation, and the position of camera and light should keep fixing and can not rock in whole process of the test.
Thin sight bed course grain size analysis method of the present invention: adopt without punctuation Digital photographic, to bed course particle dyeing spot processed, utilize image correlation analysis, bed course particle is carried out to deformation measurement and explanation, analyze bed course failure mode.
It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.In the present embodiment not clear and definite each ingredient all available prior art realized.
Claims (1)
1. the research method based on discrete particle blotter failure mode, is characterized in that: comprise the following steps:
(1) Model Pile is placed in model casing and presses close to transparent toughened glass, when the sample preparation of knockout soil is to position, Model Pile stake top in model casing, stop knockout, and by the upper surface leveling of sand;
(2) on Model Pile stake top, lay the blotter sample preparation of processing through speckle, blotter laying depth is the twice of Model Pile diameter, leveling blotter surface;
(3) then arrange successively steel plate cushion cap and charger, use hydraulic oil pound controlled loading device, on steel plate cushion cap, set up displacement and survey dial gauge measurement load deflection;
(4) before transparent toughened glass, set up high-resolution digital camera, blotter particle in loading procedure is followed the trail of to shooting, utilize the analytical test of image correlation process software to take pictures, blotter particle is carried out to deformation measurement and explanation, analyze bed course failure mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210256639.7A CN102749251B (en) | 2012-07-24 | 2012-07-24 | Testing apparatus and research method based on discrete particle gravel cushion damage mode |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210256639.7A CN102749251B (en) | 2012-07-24 | 2012-07-24 | Testing apparatus and research method based on discrete particle gravel cushion damage mode |
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| Publication Number | Publication Date |
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| CN102749251A CN102749251A (en) | 2012-10-24 |
| CN102749251B true CN102749251B (en) | 2014-04-02 |
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| CN108593428A (en) * | 2018-04-24 | 2018-09-28 | 重庆大学 | A kind of discrete material Particle Breakage test device and test method |
| CN111077027B (en) * | 2019-12-13 | 2022-04-29 | 天津大学 | Method for determining shear strength of calcareous sand under high stress |
| CN114324076B (en) * | 2022-03-10 | 2022-05-31 | 西南交通大学 | Grading rubble basic unit granule migration measuring device that permeates water |
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| CN102095650B (en) * | 2011-01-21 | 2012-12-05 | 中国科学院地质与地球物理研究所 | Method for testing strength of soil-rock mixture |
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