CN101178395B - Non-contact type rock three-way shrinkage test device - Google Patents
Non-contact type rock three-way shrinkage test device Download PDFInfo
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- CN101178395B CN101178395B CN2007101686117A CN200710168611A CN101178395B CN 101178395 B CN101178395 B CN 101178395B CN 2007101686117 A CN2007101686117 A CN 2007101686117A CN 200710168611 A CN200710168611 A CN 200710168611A CN 101178395 B CN101178395 B CN 101178395B
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- displacement sensor
- laser displacement
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Abstract
The invention relates to a non-contact rock soil three-dimensional contraction testing device and a testing method, the invention is composed of a square frame, a laser displacement sensor, a laser displacement sensor support, soil sample and a soil sample support, a guide slot which is used for translating the laser displacement sensor support is arranged on the square frame, a wedge-shaped fixed slot which is used for fixing the soil sample support is arranged on a bottom board, and the position of the laser displacement sensor on the laser displacement sensor support can be regulated by inner thread, an adjusting screw rod, a manual rotating wheel and a screw rod which is provided with a hole. Therefore, the invention can carry out the measurement of the three-dimensional expansion andcontraction deformation of the soil sample in the test, so as to realize the accurate measurement of the three-dimensional expansion and contraction deformation performance of the soil sample.
Description
Technical field
The present invention relates in the Soil Mechanics and Foundations foundation works a kind of at the indoor test unit that carries out fine grained soil three-dimensional drawdown deformation mensuration.
Background technology
At present, the instrument and equipment of measuring the contraction of indices of fine grained soil both at home and abroad generally all is made up of support, contact location moving device (as mechanical type scale or displacement transducer), drafting board, porous plate, cushion block, soil sample etc.When carrying out shrinkage test, generally all be to adopt cutting ring that the soil sample for preparing is placed on the porous plate, claim the quality of sample and porous plate.On support, install the vertical location moving device of contact then, write down the vertical displacement initial reading.Be to carry out shrinkage test under 1～30 ℃ the condition in temperature, water percentage and contraction speed according to sample, surveyed the vertical deformation and the quality of a sample of meter every 1～4 hour, after slowing down as the drawdown deformation of sample, surveying the timing interbody spacer can further strengthen, constant substantially until the vertical deformation value of twice long period interval institute test specimens.After the vertical deformation measurement of sample is finished, with sample drying and measure volume.Calculate line shrinkage, body shrinkage and the contraction coefficient of sample by standard or rules.
When adopting present shrinkage test device to carry out shrinkage test, for hitting real soil sample, because of soil sample more even, the distortion of sample also relatively evenly in the dehydration contraction process, generally the inhomogeneous situation of big local deformation can not take place, the vertical deformation value that determining displacement equipment is surveyed can be represented the vertical deformation of monoblock sample substantially.But; for undisturbed soil sample; influence because of factors such as the structure of the unevenness of natural soil sample and soil sample, cracks; make that what the uneven situation of local deformation all can occur to soil sample in the dehydration contraction process; particularly when water percentage is reduced near shrinkage limit; for the fissurity clay, local warpage takes place even fall the phenomenon of piece through regular meeting.Make institute's deformation values of surveying unusual " expansions " or " contractions " phenomenon occur, bring than difficult greatly for the processing of test figure and the accurate calculating of sample shrinkability index, even can cause the test findings distortion, the improper situation of shrinkage differentiation of soil sample.
In addition, at present contact shrinkage test device can only measure soil sample vertically to drawdown deformation, can not measure the level of soil sample synchronously to distortion.No matter hit real soil sample or undisturbed soil sample, what all have certain anisotropy, and respectively also just there is certain difference in it to drawdown deformation in contraction process, and promptly each of soil sample is inequality to contraction of indices.Present contact shrinkage test device can't adopt same soil sample measure simultaneously its vertically to level to distortion, bring bigger difficulty for the anisotropic drawdown deformation characteristic of the research soil body.
Summary of the invention
The objective of the invention is: be in process of the test, to measure the deficiency of the accurate drawdown deformation of undisturbed soil sample under the low-water-content situation well on the one hand for solving present cohesive soil shrinkage test device; On the other hand, can separate and to adopt same soil sample to measure the vertical and level of the soil body simultaneously to a difficult problem of being out of shape.The invention provides a kind of non-contact type rock three-way shrinkage test device, can be easily according to the characteristics of sample, in process of the test, accurately measure the whole vertical deformation value of soil sample in each contraction phase, for the soil sample contraction of indices accurately determine give security, and the vertical and level that can measure the soil body simultaneously is to the drawdown deformation index, for the anisotropy deformation characteristic of the research soil body is offered help.
For achieving the above object, non-contact type rock three-way shrinkage test device of the present invention is made up of quadra, laser displacement sensor, laser displacement sensor support, soil sample and soil sample bearing; It is characterized in that forming of quadra by framework upper frame 12, framework bogie side frame 13, frame base 14; Frame base 14 is provided with wedge shape pickup groove 22 and positioning baffle 23 is used for fixing soil sample bearing wedge-shaped floor 20.The soil sample bearing is made up of porous plate 18, the soil sample bearing wedge-shaped floor 20 of soil sample bearing support plate 19, band circular port 21; All be provided with laser displacement sensor support guide groove 17 on the framework upper frame 12 of quadra, framework bogie side frame 13, the frame base 14; The laser displacement sensor support is made up of laser displacement sensor holder 5, laser displacement sensor cable 6, laser displacement sensor screw mandrel holder 7, laser displacement sensor adjustment screw mandrel 8, bearing 9, hand wheel 10, laser displacement sensor holder guide pole 15, the laser displacement sensor support guide pole 16 of laser displacement sensor 1, screw rod with holes 2, external fixation bolt 3, internal fixation bolt 4, band internal thread 11.Screw rod 2 with holes is used for fixing laser displacement sensor 1, and by the distance between external fixation bolt 3 and internal fixation bolt 4 adjusting laser displacement sensors 1 and the soil sample 24; Because of having internal thread 11 in the laser displacement sensor holder 5, by hand wheel 10 laser displacement sensor is adjusted screw mandrel 8 and rotate, just can drive laser displacement sensor 1 and move freely and locate along laser displacement sensor holder guide pole 15 directions; The laser displacement sensor support can also pass through laser displacement sensor support guide pole 16 translation in laser displacement sensor support guide groove 17.Can measure the swell-shrinking deformation on 5 faces in soil sample 24 front, back, left, right, up simultaneously, and the vertical and level that can measure the soil body simultaneously is to the drawdown deformation index.
The size of quadra, laser displacement sensor support and soil sample bearing can be processed into different specifications according to the size of soil sample 24 and the size of swell-shrink characteristic size and laser displacement sensor 1.
At first process a tape guide groove, and the demountable square rigid frame that can install the laser displacement sensor support, the size of rigid frame is determined according to the size of laser displacement sensor 1 and soil sample 24, the range of laser displacement sensor 1 depends on original state, the swell-shrink characteristic of soil sample 24, and the precision of laser displacement sensor 1 then depends on the purpose and the requirement of test.When carrying out shrinkage test, earlier that soil sample 24 is good by the requirement processing and preparing of test, handle with care on the porous plate 18 of the soil sample bearing that holds soil sample 24, and take by weighing initial weight, again soil sample 24 and soil sample bearing are put in the quadra base together, and soil sample bearing wedge-shaped floor 20 is advanced in the wedge shape pickup groove 22, and soil sample bearing wedge-shaped floor 20 is well contacted with positioning baffle 23.The position of 5 laser displacement sensors 1 is adjusted, and on 5 faces of soil sample 24, measure laser displacement sensor 1 initial value of some according to the requirement of test.Can shrink situation according to the dehydration of soil sample 24 then, repeat to weigh and read the step of displacement transducer 1 reading, shrink stable until soil sample 24.
Owing to adopt laser displacement sensor 1, can realize contactless measurement, and laser displacement sensor 1 can be on the arbitrfary point of soil sample 24 plane both directions positioning measurement, both can measure by the net point of finishing in advance, also can carry out the measurement of arbitrfary point according to the actual conditions of soil sample 24 distortion, the quantity of measuring point also can be decided according to the situation and the test of soil sample 24 swell-shrinking deformations.Make the measurement of soil sample 24 swell-shrinking deformations more representative, also more accurate.
It is exactly to measure the three-dimensional swell increment that the soil sample 24 under the no load situation slowly absorbs water that this device also has an advantage, the measurement of soil sample 24 dilatational straiies is disturbed be reduced to minimum level.
Description of drawings
Fig. 1 is contactless rock three-way shrinkage test installation drawing.
Fig. 2 is contactless rock three-way shrinkage test device A-A sectional view.
Fig. 3 is a laser displacement sensor support front elevation.
Fig. 4 is a laser displacement sensor support B-B sectional view.
Fig. 5 is a laser displacement sensor support C-C sectional view.
Fig. 6 is a laser displacement sensor support D-D sectional view.
Fig. 7 is a laser displacement sensor support E-E sectional view.
Fig. 8 is a laser displacement sensor support F-F sectional view.
Fig. 9 is soil sample bearing front elevation and G-G sectional view thereof.
Figure 10 is soil sample bearing vertical view and H-H sectional view thereof.
As shown in the figure: laser displacement sensor 1, screw rod 2 with holes, external fixation bolt 3, internal fixation bolt 4, laser displacement sensor holder 5, laser displacement sensor cable 6, laser displacement sensor screw mandrel holder 7, laser displacement sensor is adjusted screw mandrel 8, bearing 9, hand wheel 10, internal thread 11, framework upper frame 12, framework bogie side frame 13, frame base 14, laser displacement sensor holder guide pole 15, laser displacement sensor support guide pole 16, laser displacement sensor support guide groove 17, porous plate 18, soil sample bearing support plate 19, soil sample bearing wedge-shaped floor 20, circular port 21, wedge shape pickup groove 22, positioning baffle 23, soil sample 24.
Embodiment
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments.Fig. 1 is the non-contact type rock three-way shrinkage test device that the present invention adopts the cube soil sample, before testing, earlier used soil sample 24 is carried out suitable processing, soil sample 24 is cut into the regular hexahedron of rule, so that when carrying out shrinkage test, can measure the three-dimensional drawdown deformation of soil sample 24 according to the gauge point of trying one's best few.
When testing, earlier will be by framework upper frame 12, framework bogie side frame 13, the quadra that frame base 14 is formed and by laser displacement sensor 1, screw rod 2 with holes, external fixation bolt 3, internal fixation bolt 4, the laser displacement sensor holder 5 of band internal thread 11, laser displacement sensor cable 6, laser displacement sensor screw mandrel holder 7, laser displacement sensor is adjusted screw mandrel 8, bearing 9, hand wheel 10, laser displacement sensor holder guide pole 15, the movable supporting frame that laser displacement sensor support guide pole 16 is formed assembles, and the soil sample bearing group of laying soil sample 24 is ready.Again the soil sample 24 for preparing is placed on the porous plate 18 of soil sample bearing band circular port 21, soil sample 24 is placed on the soil sample bearing takes by weighing initial weight on the weigh scale.Then the laser displacement sensor support in the non-contact type rock three-way shrinkage test device front direction along laser displacement sensor support guide groove 17 is moved, soil sample bearing wedge-shaped floor 20 can be inserted in the wedge shape pickup groove 22 on the frame base 14 easily, again the soil sample bearing is shifted onto and contacted in placely with positioning baffle 23, and fix.Before inciting somebody to action one by one again, after, a left side, the laser displacement sensor 1 that is fixed on the laser displacement sensor holder 5 right and top passes through laser displacement sensor holder guide pole 15, laser displacement sensor support guide pole 16, laser displacement sensor support guide groove 17, hand wheel 10 and laser displacement sensor are adjusted the position that screw mandrel 8 is adjusted to soil sample 24 correspondences, and before reading successively, after, a left side, the initial reading of the laser displacement sensor 1 on the right side and top, the number of each laser displacement sensor 1 each survey read data on 24 1 faces of soil sample can be carried out by the scheme of determining before the test, or grasps flexibly in the situation of different phase drawdown deformation according to soil sample soil sample 24 again.
Non-contact type rock three-way shrinkage test device of the present invention can be according to the needs of test, and the three-dimensional swell-shrinking deformation situation of real-time measurement soil sample 24 is carried out contactless deformation measurement easily, make the three-dimensional swell-shrinking deformation test determination of soil sample 24 more convenient accurately.And it is simple in structure, easy to operate.
Claims (4)
1. a non-contact type rock three-way shrinkage test device is made up of quadra, laser displacement sensor and secondary instrument, laser displacement sensor support, soil sample and soil sample bearing; It is characterized in that quadra is made up of framework upper frame (12), framework bogie side frame (13), frame base (14); Frame base (14) is provided with wedge shape pickup groove (22) and positioning baffle (23) is used for fixing soil sample bearing wedge-shaped floor (20); The soil sample bearing is made up of porous plate (18), the soil sample bearing wedge-shaped floor (20) of soil sample bearing support plate (19), band circular port (21); All be provided with laser displacement sensor support guide groove (17) on the framework upper frame (12) of quadra, framework bogie side frame (13), the frame base (14); The laser displacement sensor support is by laser displacement sensor (1), screw rod with holes (2), external fixation bolt (3), internal fixation bolt (4), the laser displacement sensor holder (5) of band internal thread (11), laser displacement sensor cable (6), laser displacement sensor screw mandrel holder (7), laser displacement sensor is adjusted screw mandrel (8), bearing (9), hand wheel (10), laser displacement sensor holder guide pole (15), laser displacement sensor support guide pole (16) is formed; Screw rod with holes (2) is used for fixing laser displacement sensor (1), and by the distance between external fixation bolt (3) and internal fixation bolt (4) adjusting laser displacement sensor (1) and the soil sample (24); Because of having internal thread (11) in the laser displacement sensor holder (5), by hand wheel (10) laser displacement sensor is adjusted screw mandrel (8) and rotate, just can drive laser displacement sensor (1) and move freely and locate along laser displacement sensor holder guide pole (15) direction; The laser displacement sensor support can also pass through laser displacement sensor support guide pole (16) translation in laser displacement sensor support guide groove (17), can measure the swell-shrinking deformation on 5 faces in soil sample (24) front, back, left, right, up simultaneously, and the vertical and level that can measure the soil body simultaneously is to the drawdown deformation index.
2. non-contact type rock three-way shrinkage test device according to claim 1, it is characterized in that laser displacement sensor (1) can be on the arbitrfary point of soil sample (24) plane both direction positioning measurement, the point position of soil sample (24) swell-shrinking deformation can be reserved in advance, also can adjust at any time according to the swell-shrinking deformation situation of soil sample (24), the quantity of measuring point also can be decided according to the situation and the test of soil sample (24) swell-shrinking deformation.
3. non-contact type rock three-way shrinkage test device according to claim 1, the size that it is characterized in that quadra, laser displacement sensor support and soil sample bearing, can be processed into different specifications according to the size of soil sample (24) and the size of swell-shrink characteristic size and laser displacement sensor (1).
4. non-contact type rock three-way shrinkage test device according to claim 1, it is characterized in that laser displacement sensor (1) can be different with the requirement to test accuracy according to the swell-shrinking property of soil sample (24), change the laser displacement sensor (1) of different ranges and precision.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101686117A CN101178395B (en) | 2007-12-05 | 2007-12-05 | Non-contact type rock three-way shrinkage test device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101686117A CN101178395B (en) | 2007-12-05 | 2007-12-05 | Non-contact type rock three-way shrinkage test device |
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| CN101178395A CN101178395A (en) | 2008-05-14 |
| CN101178395B true CN101178395B (en) | 2010-12-22 |
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| CN2007101686117A Expired - Fee Related CN101178395B (en) | 2007-12-05 | 2007-12-05 | Non-contact type rock three-way shrinkage test device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102353607A (en) * | 2011-06-15 | 2012-02-15 | 中国地质大学（武汉） | Contractometer |
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| CN102636427B (en) * | 2012-03-26 | 2014-03-12 | 长沙理工大学 | Tester for soil vertical and radial expansive deformation and expansive force relation |
| CN103063821A (en) * | 2013-01-10 | 2013-04-24 | 南宁轨道交通有限责任公司 | Model box, sensor fixing device and test method |
| CN103323576B (en) * | 2013-06-09 | 2015-04-08 | 河海大学 | True three-dimensional swell-shrink instrument |
| CN103543250A (en) * | 2013-10-29 | 2014-01-29 | 上海大学 | Undisturbed three-way contraction testing device |
| CN104133049A (en) * | 2014-07-10 | 2014-11-05 | 中南大学 | Determination device for free expansion ratio of rock |
| CN106501485B (en) * | 2016-10-28 | 2019-04-30 | 三峡大学 | Multi-functional soil sample expansion and shrinkage tester and test method |
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| CN107703051B (en) * | 2017-11-10 | 2023-08-04 | 中国科学院武汉岩土力学研究所 | Three-way loading device for interaction of soil body and foundation under cyclic load |
| CN108362728B (en) * | 2018-01-19 | 2020-04-28 | 防灾科技学院 | Indoor test system for three-dimensional expansion deformation of modified soil in cold region |
| CN108508188A (en) * | 2018-05-13 | 2018-09-07 | 桂林理工大学 | A kind of novel disturbance rejection shrinkage test device |
| CN108489440B (en) * | 2018-06-01 | 2023-11-28 | 厦门大学嘉庚学院 | Device for monitoring dynamic horizontal displacement of vertical rod of high formwork support frame and application method of device |
| CN109085070B (en) * | 2018-08-09 | 2020-10-09 | 河海大学 | Visual test device and method for shear characteristic research of soil and structure |
| CN109696368B (en) * | 2019-01-30 | 2020-10-30 | 济南鑫光试验机制造有限公司 | Asphalt triaxial fatigue testing machine |
| CN113529823B (en) * | 2021-07-23 | 2022-07-22 | 桂林理工大学 | Pile foundation indoor model test device and test method |
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Patent Citations (2)
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|---|---|---|---|---|
| WO2001061115A1 (en) * | 2000-02-19 | 2001-08-23 | Hossein Hosseini Tudeshki | Method and device for compacting cohesive and non-cohesive material by means of pulsed displacement |
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Non-Patent Citations (1)
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Cited By (1)
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| CN102353607A (en) * | 2011-06-15 | 2012-02-15 | 中国地质大学（武汉） | Contractometer |
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| CN101178395A (en) | 2008-05-14 |
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