CN203758882U - Coarse particle soil penetration test device eliminating boundary effect - Google Patents
Coarse particle soil penetration test device eliminating boundary effect Download PDFInfo
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- CN203758882U CN203758882U CN201420105991.5U CN201420105991U CN203758882U CN 203758882 U CN203758882 U CN 203758882U CN 201420105991 U CN201420105991 U CN 201420105991U CN 203758882 U CN203758882 U CN 203758882U
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Abstract
The utility model discloses a coarse particle soil penetration test device eliminating boundary effect. The device is structured in such a manner that a lower permeable plate (4b) is fixed at the bottom of a circular test sample barrel (1), the wall of the test sample barrel (1) extends downward to be connected with a base (1a), and a permeable hole (5) is formed on the wall of the test sample barrel (1) extending downward; a spillway hole (2) is formed on the upper part of the test sample barrel (1), and the middle upper part, the middle part and the middle lower part of the test sample barrel (1) are respectively connected with an upper pressure testing pipe (3a), a middle pressure testing pipe (3b) and a lower pressure testing pipe (3c); a flexible waterproof material layer (7) is coated on the inner wall of the test sample barrel (1) below the spillway hole (2); and an upper permeable plate (4a) which is adaptive to the lower permeable plate in inner diameter is placed in the test sample barrel (1). The test device can reduce the boundary effect generated in the test process, so that the condition of the penetration test further meets the actual condition, and the test result is more accurate and reliable.
Description
Technical field
The utility model relates to a kind of for eliminating the test unit of coarse-grained soil permeability test wall effect, belongs to soil test technique field.
Background technology
Soil mesoporosity can form water-permeable passage while being interconnected.Although these passage very irregulars, and often very narrow, water can lean on its gravity to flow in soil along these passages.Water mobile phenomenon in the passage of soil pores, is called the seepage flow of water; The character that soil can be seen through by water, is called native perviousness or water permeability, and it is one of native mechanical property.The infiltration coefficient of soil is the parameter of evaluation soil permeability size, and the infiltration coefficient of soil is larger, and water permeability is stronger; Otherwise, more weak.
Shop experiment is measured the theoretical foundation of native infiltration coefficient: by measuring the seepage flow flow of soil sample xsect A
qor flow velocity v, the loss of flood peak of unit flow process is hydraulic gradient i, osmotic coefficient k that must be unearthed by Darcy's law v=ki inverse.The infiltration coefficient of coarse-grained soil is about 10
-2-10
-4cm/s, its water permeability is better.The method of the indoor measurement coarse-grained soil infiltration coefficient that all kinds of standards are all stipulated is all to adopt constant head permeability test, that is: in test specimen tube, sample is prepared in layering, after sample makes, after sample water filling is saturated, covers porous disc; By the upper porous disc on test specimen tube top, in conjunction with the spillway hole of upper porous disc top test specimen tube sidewall, sample is carried out to constant pressure water flooding (applying constant head) again; Then the water level that reads three piezometric tube of test specimen tube upper, middle and lower portion measures with graduated cylinder the amount of seepage that test specimen tube flows out by lower porous disc simultaneously; Then, according to the water level of three piezometric tube, amount of seepage and time of penetration, calculate unearthed infiltration coefficient by Darcy's law.The infiltration coefficient that this method is measured can produce error because of the wall effect of coarse-grained soil and instrument cylinder.
So-called wall effect, refer to that the hole between the barrel of test specimen tube of coarse soil particles and rigidity is large compared with the hole between coarse soil particles, the connectedness of the water-permeable passage that soil particle and barrel form is good compared with between soil particle also, under identical head (hydraulic pressure) effect, the percolation flow velocity between coarse soil particles and barrel is greater than the actual percolation flow velocity between coarse soil particles; Also there is more water to flow away from the lie of coarse-grained soil itself non-existent barrel.The osmotic coefficient ratio actual value that causes test to record is large, has affected the accuracy of test.
Utility model content
It is a kind of for eliminating the test unit of coarse-grained soil permeability test wall effect that the purpose of this utility model has been to provide.This test unit can reduce the wall effect producing in process of the test, thereby the condition of permeability test more can be tallied with the actual situation, and test findings more accurately, reliably.
The technical scheme in the invention for solving the technical problem is, a kind of coarse-grained soil infiltration experiment device of eliminating wall effect, and its composition is: the fixing lower porous disc in bottom of circular test specimen tube; The wall of test specimen tube stretches out downwards with base and is connected, and the wall that test specimen tube stretches out is downwards provided with water seepage hole; Test specimen tube top is provided with spillway hole, and the middle and upper part of test specimen tube, middle part and middle and lower part are connected with respectively piezometric tube, middle piezometric tube and lower piezometric tube; On the inwall of test specimen tube below spillway hole, be coated with flexible material water-proof material layer; The upper porous disc of internal diameter and test specimen tube internal diameter adaptation is placed in test specimen tube.
Compared with prior art, the beneficial effects of the utility model are:
On inwall due to test specimen tube, be coated with flexible material water-proof material layer; When in test specimen tube, sample is prepared in layering, soil particle in compacting process, can push flexible material water-proof material and with its formation close contact, stop up the inwall of test specimen tube and the hole between soil particle.After sample makes, porous disc on specimen surface covers, can carry out the mensuration of infiltration coefficient.Inwall and the hole between soil particle due to test specimen tube during mensuration are blocked, the water of seepage flow can only be by hole seepage flow own between soil particle, thereby eliminated the wall effect in coarse-grained soil permeability test, the condition of permeability test more can be tallied with the actual situation, and test findings more accurately, reliably.
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is that the utility model embodiment makes, covers the whole sectional structure schematic diagram after porous disc at sample.
Fig. 2 is the structure for amplifying schematic diagram of the local A of Fig. 1.
In Fig. 1, Fig. 2,6 is sample.
Embodiment
Embodiment
Fig. 1 and Fig. 2 illustrate, and a kind of embodiment of the present utility model is a kind of coarse-grained soil infiltration experiment device of eliminating wall effect, and its composition is: the fixing lower porous disc 4b in bottom of circular test specimen tube 1; The wall of test specimen tube 1 stretches out downwards with base 1a and is connected, and the wall that test specimen tube 1 stretches out is downwards provided with water seepage hole 5; Test specimen tube 1 top is provided with spillway hole 2, and the middle and upper part of test specimen tube 1, middle part and middle and lower part are connected with respectively piezometric tube 3a, middle piezometric tube 3b and lower piezometric tube 3c; Test specimen tube 1 is coated with flexible material water-proof material layer 7 on the inwall below 2 at spillway hole; The upper porous disc 4a of internal diameter and test specimen tube 1 internal diameter adaptation is placed in test specimen tube 1.
After repeatedly using, as flexible material water-proof material layer damages, wiped off, again applied the flexible material water-proof material layer 7 of one deck.It is silicone glue-line or silastic-layer that flexible material water-proof material layer can be selected.
Claims (1)
1. a coarse-grained soil infiltration experiment device of eliminating wall effect, its composition is: the fixing lower porous disc (4b) in bottom of circular test specimen tube (1); The wall of test specimen tube (1) stretches out downwards with base (1a) and is connected, and the wall that test specimen tube (1) stretches out is downwards provided with water seepage hole (5); Test specimen tube (1) top is provided with spillway hole (2), and middle and upper part, middle part and the middle and lower part of test specimen tube (1) is connected with respectively piezometric tube (3a), middle piezometric tube (3b) and lower piezometric tube (3c); On the inwall of test specimen tube (1) below spillway hole (2), be coated with flexible material water-proof material layer (7); The upper porous disc (4a) of internal diameter and test specimen tube (1) internal diameter adaptation is placed in test specimen tube (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420105991.5U CN203758882U (en) | 2014-03-10 | 2014-03-10 | Coarse particle soil penetration test device eliminating boundary effect |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420105991.5U CN203758882U (en) | 2014-03-10 | 2014-03-10 | Coarse particle soil penetration test device eliminating boundary effect |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203758882U true CN203758882U (en) | 2014-08-06 |
Family
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420105991.5U Expired - Fee Related CN203758882U (en) | 2014-03-10 | 2014-03-10 | Coarse particle soil penetration test device eliminating boundary effect |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105194913A (en) * | 2015-09-25 | 2015-12-30 | 山东建筑大学 | Filter column for water treatment pilot scale test |
| CN105973782A (en) * | 2016-05-25 | 2016-09-28 | 长安大学 | Determination instrument and determination method for osmotic coefficients of drilling and coring test part |
| CN107024421A (en) * | 2017-06-08 | 2017-08-08 | 西南交通大学 | Seepage tests system |
| CN109297881A (en) * | 2018-10-12 | 2019-02-01 | 西南交通大学 | A kind of determination method of coarse-grained soil permeability test side wall process layer thickness |
| CN110082275A (en) * | 2019-05-22 | 2019-08-02 | 陕西秦海检测科技有限公司 | It is large-scale simple with the vertical seepage deformation tester of coarse-grained soil and test method |
| CN110296925A (en) * | 2019-07-08 | 2019-10-01 | 西南交通大学 | A kind of coarse-grained soil osmotic coefficient investigating method considering permeameter wall effect |
| CN110733192A (en) * | 2019-10-08 | 2020-01-31 | 中国矿业大学 | Manufacturing method of organic glass tube for sandstone seepage model |
-
2014
- 2014-03-10 CN CN201420105991.5U patent/CN203758882U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105194913A (en) * | 2015-09-25 | 2015-12-30 | 山东建筑大学 | Filter column for water treatment pilot scale test |
| CN105194913B (en) * | 2015-09-25 | 2017-04-26 | 山东建筑大学 | Filter column for water treatment pilot scale test |
| CN105973782A (en) * | 2016-05-25 | 2016-09-28 | 长安大学 | Determination instrument and determination method for osmotic coefficients of drilling and coring test part |
| CN107024421A (en) * | 2017-06-08 | 2017-08-08 | 西南交通大学 | Seepage tests system |
| CN109297881A (en) * | 2018-10-12 | 2019-02-01 | 西南交通大学 | A kind of determination method of coarse-grained soil permeability test side wall process layer thickness |
| CN109297881B (en) * | 2018-10-12 | 2020-12-11 | 西南交通大学 | Method for determining thickness of sidewall treatment layer in coarse-grained soil permeability test |
| CN110082275A (en) * | 2019-05-22 | 2019-08-02 | 陕西秦海检测科技有限公司 | It is large-scale simple with the vertical seepage deformation tester of coarse-grained soil and test method |
| CN110296925A (en) * | 2019-07-08 | 2019-10-01 | 西南交通大学 | A kind of coarse-grained soil osmotic coefficient investigating method considering permeameter wall effect |
| CN110733192A (en) * | 2019-10-08 | 2020-01-31 | 中国矿业大学 | Manufacturing method of organic glass tube for sandstone seepage model |
| CN110733192B (en) * | 2019-10-08 | 2020-07-17 | 中国矿业大学 | Manufacturing method of organic glass tube for sandstone seepage model |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140806 Termination date: 20170310 |