CN103364234B - A kind of sand method processed for soil test - Google Patents
A kind of sand method processed for soil test Download PDFInfo
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- CN103364234B CN103364234B CN201210100453.2A CN201210100453A CN103364234B CN 103364234 B CN103364234 B CN 103364234B CN 201210100453 A CN201210100453 A CN 201210100453A CN 103364234 B CN103364234 B CN 103364234B
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention relates to a kind of sand method processed for soil test, comprise the following steps: the height setting the staving of sand device processed, shower nozzle distance sand face, the aperture of screen cloth, shower nozzle mobile route and speed; Prepare sand sample, calculate its relative compaction; Independently change the shower nozzle distance height in sand face and the pore size of screen cloth, again prepare sand sample, and calculate its relative compaction; Make the graph of a relation of sand relative compaction and shower nozzle distance sand face height and mesh size; According to required sand relative compaction, from graph of a relation, find out the pore size of corresponding sand relative compaction and the height in shower nozzle distance sand face; Required sand is prepared apart from the height in sand face according to aperture and shower nozzle.Compared with prior art, method of the present invention, especially for the preparation of soil test medium sand soil sample, makes up the deficiency of classic method, accurately can prepare even, satisfactory sample, and all have repeatability, thus the consistance of warranty test sand sample.
Description
Technical field
The present invention relates to a kind of sand method processed, especially relate to a kind of sand method processed for soil test.
Background technology
Model scale is will produce the soil body and the distortion of model gravity after the 1/N of prototype by common soil test, and Geotechnical Centrifugal Model Test by the N that centrifugal acceleration field brought up to gravity field doubly to reduce original stress state thus the gravity distortion made up because model scale produces.Therefore, in the last few years, geotechnical centrifuge was widely used in Geotechnical Engineering test.Sand is common used material in Geotechnical Centrifugal Model Test, and in the small scaled model tests such as centrifugal test, it is vital for accurately, unanimously, repeatably preparing sand sample to the original Site Soil characteristic of reproduction.In process of the test, as can not be accurate, consistent prepare sand sample, test findings will produce relatively large deviation, reduce received degree.
A lot of shortcoming is had with the sand sample in the test of conventional method preparative centrifugation, as poor in: consistance, there is larger randomness, the stable of sand sample character cannot be ensured in long run test; Meanwhile, the mechanical property parameters of prepared sample lacks accuracy; Sand sample cannot ensure homogeneity.These are not enough will affect test findings.
Summary of the invention
Object of the present invention be exactly provide to overcome defect that above-mentioned prior art exists a kind of evenly, meet the requirements and can repeat, the conforming sand method processed for soil test of warranty test sand sample.
Object of the present invention can be achieved through the following technical solutions:
For a sand method processed for soil test, comprise the following steps:
(1) height in the staving of sand device processed, shower nozzle distance sand face is set, the aperture of shower nozzle screen cloth, shower nozzle mobile route and speed;
(2) make sand sample, calculate the relative compaction of sand sample;
(3) independently change the shower nozzle distance height in sand face and the pore size of screen cloth, again prepare sand sample, and calculate the relative compaction of sand sample;
(4) graph of a relation of sand relative compaction and shower nozzle distance sand face height and mesh size is obtained according to above data;
(5) according to required sand relative compaction, from graph of a relation, the pore size of corresponding sand relative compaction and the height in shower nozzle distance sand face is obtained;
(6) according to the aperture of step (5) and the required sand of height preparation in shower nozzle distance sand face.
Be provided with baffle plate below described staving, in sand process processed, open baffle plate.
Described sand sample is arranged in model casing or holds the container of sand.
The mobile route of described shower nozzle is horizontal continuous moving or longitudinal continuous moving.
Keep the height in staving and shower nozzle distance sand face constant when making sand sample.
The height in described shower nozzle distance sand face is 20-110cm.
The translational speed of described shower nozzle is 10cm/s.
The aperture of described shower nozzle screen cloth is 5-9mm.
Compared with prior art, the present invention strictly controls the relative compaction of sand by controlling the distance of mesh size, shower nozzle and Shamian Island, shower nozzle mobile route and speed, especially for the preparation of soil test medium sand soil sample, make up the deficiency of classic method, accurately can prepare even, satisfactory sample, and all have repeatability, thus the consistance of warranty test sand sample.
Accompanying drawing explanation
Fig. 1 is that sand relative compaction and mesh size, shower nozzle are apart from the relation curve of sand face height.
Fig. 2 is that shower nozzle vertically moves path above model casing;
Fig. 3 is the transverse shifting path of shower nozzle above model casing.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Embodiment
Get certain sand and be about 150kg, staving is hung on and exceeds model casing or other container holding sand is about 150cm place.Be that the screen cloth of 5mm is placed in closing baffle plate behind shower nozzle place by aperture.In staving, open baffle plate after sand loading, shower nozzle is placed in distance model case or other holds the container 30cm place of sand, mobile shower nozzle above the container holding sand by path shown in Fig. 2 or Fig. 3 with the translational speed of 10cm/s at model casing or other.After sand face often raises 2cm, the height of shower nozzle and staving is promoted 2cm simultaneously, until prepared by sand sample, calculate the relative compaction of sand.After sand is poured out in model casing, again prepare sand, be that the distance in shower nozzle and sand face is set as 30cm with difference last time, all the other steps are identical with previous.After this, during each preparation, all the distance in shower nozzle and sand face is raised 20cm until reach 110cm, and change the sieve aperture of different pore size, array mode as shown in table 1 arranges the height in size of mesh and shower nozzle distance sand face, repeatedly repeat above-mentioned steps and prepare sand, the relative compaction of the sand obtained when obtaining each sample preparation, sand relative compaction is plotted chart with the relation of shower nozzle apart from sand face height and is linked to be curve, as shown in Figure 1, curve finds the height in the required sieve diameter corresponding to sand relative compaction and shower nozzle distance sand face, and with the required sand of this parameter preparation test.
Table 1
A kind of sand device processed for soil test of the present invention, controls relative to the height in sand face and the aperture of shower nozzle screen cloth the relative compaction preparing sand by change staving, shower nozzle.It is characterized in that the distance by controlling mesh size, shower nozzle and Shamian Island, shower nozzle mobile route and speed strictly control the relative compaction of sand, and ensure that the sample of preparation is even, consistent, have repeatability.
Claims (7)
1., for a sand method processed for soil test, it is characterized in that, comprise the following steps:
(1) height in the staving of sand device processed, shower nozzle distance sand face is set, the aperture of shower nozzle screen cloth, shower nozzle mobile route and speed;
(2) make sand sample, calculate the relative compaction of sand sample, when making sand sample, keep the height in staving and shower nozzle distance sand face constant;
(3) independently change the shower nozzle distance height in sand face and the pore size of screen cloth, again prepare sand sample, and calculate the relative compaction of sand sample;
(4) graph of a relation of sand relative compaction and shower nozzle distance sand face height and mesh size is obtained according to above data;
(5) according to required sand relative compaction, from graph of a relation, the pore size of corresponding sand relative compaction and the height in shower nozzle distance sand face is obtained;
(6) according to the aperture of step (5) and the required sand of height preparation in shower nozzle distance sand face.
2. a kind of sand method processed for soil test according to claim 1, is characterized in that, be provided with baffle plate below described staving, open baffle plate in sand process processed.
3. a kind of sand method processed for soil test according to claim 1, it is characterized in that, described sand sample is arranged in model casing or holds the container of sand.
4. a kind of sand method processed for soil test according to claim 1, is characterized in that, the mobile route of described shower nozzle is horizontal continuous moving or longitudinal continuous moving.
5. a kind of sand method processed for soil test according to claim 1, is characterized in that, the height in described shower nozzle distance sand face is 20-110cm.
6. a kind of sand method processed for soil test according to claim 1, it is characterized in that, the translational speed of described shower nozzle is 10cm/s.
7. a kind of sand method processed for soil test according to claim 1, it is characterized in that, the aperture of described shower nozzle screen cloth is 5-9mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210100453.2A CN103364234B (en) | 2012-04-06 | 2012-04-06 | A kind of sand method processed for soil test |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210100453.2A CN103364234B (en) | 2012-04-06 | 2012-04-06 | A kind of sand method processed for soil test |
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| CN103364234A CN103364234A (en) | 2013-10-23 |
| CN103364234B true CN103364234B (en) | 2015-10-28 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104792602A (en) * | 2015-03-24 | 2015-07-22 | 江苏科技大学 | Automatic soil-box soil loading machine and soil loading method |
| CN105931559B (en) * | 2016-05-04 | 2018-09-21 | 河海大学 | 3D printing model tunnel and sand rain method model test producing device and construction method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4534858A (en) * | 1984-06-04 | 1985-08-13 | Warren Aldrich | Sifter |
| CN2322139Y (en) * | 1998-03-10 | 1999-06-02 | 中国科学院兰州冰川冻土研究所 | Standard specimen preparing machine |
| CN101158571A (en) * | 2007-11-16 | 2008-04-09 | 清华大学 | Soil body image real time capturing method and system used for centrifugal machine model trial |
| CN201218786Y (en) * | 2008-07-01 | 2009-04-08 | 上海大学 | Saturated remolded soil sampling device |
| CN201591496U (en) * | 2009-12-25 | 2010-09-29 | 陈泽承 | Simple bath barrel |
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2012
- 2012-04-06 CN CN201210100453.2A patent/CN103364234B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4534858A (en) * | 1984-06-04 | 1985-08-13 | Warren Aldrich | Sifter |
| CN2322139Y (en) * | 1998-03-10 | 1999-06-02 | 中国科学院兰州冰川冻土研究所 | Standard specimen preparing machine |
| CN101158571A (en) * | 2007-11-16 | 2008-04-09 | 清华大学 | Soil body image real time capturing method and system used for centrifugal machine model trial |
| CN201218786Y (en) * | 2008-07-01 | 2009-04-08 | 上海大学 | Saturated remolded soil sampling device |
| CN201591496U (en) * | 2009-12-25 | 2010-09-29 | 陈泽承 | Simple bath barrel |
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