CN1328703C - Sandy soil shear volume deformation demonstrating instrument - Google Patents
Sandy soil shear volume deformation demonstrating instrument Download PDFInfo
- Publication number
- CN1328703C CN1328703C CNB2005100497477A CN200510049747A CN1328703C CN 1328703 C CN1328703 C CN 1328703C CN B2005100497477 A CNB2005100497477 A CN B2005100497477A CN 200510049747 A CN200510049747 A CN 200510049747A CN 1328703 C CN1328703 C CN 1328703C
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- CN
- China
- Prior art keywords
- sand
- rubber ball
- sandy soil
- glass tube
- colored water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The present invention discloses a sandy soil shearing volume deformation demonstrating instrument which is composed of a flat bottom rubber ball and a glass tube with both opening ends. The flat bottom rubber ball is filled with mixture of sandy soil and colored water, the upper end opening of the flat bottom rubber ball is connected with the glass tube, a joint place is sealed with glue, and 1/4 to 1/3 of the height of the glass tube is filled with the colored water. The flat bottom rubber ball is extruded by hand, and a user can visually observe that the phenomena of volume reduction and volume increase can respectively occur when the sandy soil is sheared under a loose condition and a dense condition. The present invention can iconically demonstrate the volume change rule caused by that the sandy soil is sheared under the loose condition and the dense condition.
Description
Technical field
The present invention relates to experimental provision, relate in particular to a kind of sandy soil shear volume deformation demonstrating instrument.
Background technology
Under the shear stress effect, the sand cubic deformation proterties of different dense states is different.Under loose condition (of surface), show as volumetric contraction (promptly cut and contract); And under dense state, then show as volumetric expansion (promptly cutting bloated).It generally is to explain by shear stress and cubic deformation relation curve that this fundamemtal phenomena teacher goes up class hour, and the student also can only understand this phenomenon abstractively from curve map, owing to lack the cognition of practice, the student listens and feels dull class hour.
Summary of the invention
The object of the present invention is to provide a kind of sandy soil shear volume deformation demonstrating instrument, the cubic deformation proterties when its energy image demonstration sand is sheared under two kinds of different dense states.
The technical solution used in the present invention is: the glass tube by flat rubber ball and both ends open is formed.Fill the potpourri of state of saturation sand and colored water in the flat rubber ball, the upper port of flat rubber ball connects glass tube, and seals with glue in the joint.It is high by 1/4～1/3 to managing to fill colored water in the glass tube.
The sand of filling in the described flat rubber ball is the sand of loose condition (of surface) or the sand of dense state, and sand is with being with the color water saturation.Colored water is red or blue water.
During demonstration, with rubber ball at the bottom of the hand extrusion of flat, so that the sand particle in the ball is applied a shearing force.In extruding, volume change is taken place because of cutting in the sand in the ball.For the sand of dense state, volumetric expansion takes place, promptly the hole between soil particle increases, the hole of increase by water mend into, therefore cause the glass tube middle water level to descend.For the sand of loose condition (of surface), volumetric contraction takes place, promptly inter-granular porosity diminishes, and part moisture overflows in the hole, thereby causes the glass tube middle water level to rise.Therefore, can judge the volume change proterties of sand when shearing qualitatively by the lifting of pipe middle water level.
The beneficial effect that the present invention has is: can observe sand very intuitively with rubber ball at the bottom of the finger extrusion of flat and cut respectively under loose and closely knit two states and contract and cut bloated phenomenon.
Description of drawings
Fig. 1 is the structural drawing of sand of the present invention under loose condition (of surface);
Fig. 2 is the structural drawing of sand of the present invention under dense state.
Among the figure: 1, flat rubber ball, 2, glass tube, 3, colored water, 4, the sand of loose condition (of surface), 5, the sand of dense state.
Embodiment
The invention will be further described below in conjunction with drawings and Examples.
As shown in Figure 1 and Figure 2, the present invention is made up of flat rubber ball 1 and glass tube 2.The top of flat rubber ball is nipple-like and open top, the equal opening in the two ends of glass tube 2.Fill the potpourri of sand and colored water 3 in the flat rubber ball 1, sand is in state of saturation.Flat rubber ball 1 upper port connects glass tube 2, and seals with glue in the joint.It is high by 1/4～1/3 to pipe to fill colored water 3 in the glass tube 2.
As shown in Figure 1, the sand of filling in the flat rubber ball 1 is the sand 4 of loose condition (of surface), for example, for normal sand, when dry density less than 1.5g/cm
3The time be loose condition (of surface).In the glass tube 2 water levels for pipe high 1/4.
As shown in Figure 2, the sand of filling in the flat rubber ball 1 is the sand 5 of dense state, for example, for normal sand, when dry density greater than 1.5g/cm
3The time be dense state.In the glass tube 2 water levels for pipe high 1/3.
Injecting colored water 3 in the described glass tube 2 is red or blue water.
Principle of work of the present invention is as follows:
During demonstration, with rubber ball 1 at the bottom of the hand extrusion of flat, so that the sand particle in the ball is applied a shearing force.In extruding, volume change is taken place because of cutting in the sand in the ball.For the sand of dense state, as shown in Figure 2, volumetric expansion takes place, promptly intergranular hole increases (as shown in Figure 2), the hole of increase by water mend into, therefore cause the glass tube middle water level to descend; And for the sand of loose condition (of surface), as shown in Figure 1, volumetric contraction takes place, and promptly inter-granular porosity diminishes (as shown in Figure 1), and part moisture overflows in the hole, thereby causes the glass tube middle water level to rise.Therefore, can judge the volume change proterties of sand when shearing qualitatively by the lifting of pipe middle water level.
Claims (3)
1, a kind of sandy soil shear volume deformation demonstrating instrument is characterized in that: the glass tube (2) by flat rubber ball (1) and both ends open is formed; Fill the potpourri of state of saturation sand and colored water (3) in the flat rubber ball (1), the upper port of flat rubber ball (1) connects glass tube (2), and seals with glue in the joint, and it is high by 1/4～1/3 to managing to fill colored water (3) in the glass tube (2).
2, a kind of sandy soil shear volume deformation demonstrating instrument according to claim 1, it is characterized in that: the sand of filling in the described flat rubber ball (1) is the sand (4) of loose condition (of surface) or the sand (5) of dense state, and sand is saturated with colored water (3).
3, a kind of sandy soil shear volume deformation demonstrating instrument according to claim 1 and 2 is characterized in that: described colored water (3) is red or blue water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100497477A CN1328703C (en) | 2005-05-08 | 2005-05-08 | Sandy soil shear volume deformation demonstrating instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100497477A CN1328703C (en) | 2005-05-08 | 2005-05-08 | Sandy soil shear volume deformation demonstrating instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1707560A CN1707560A (en) | 2005-12-14 |
| CN1328703C true CN1328703C (en) | 2007-07-25 |
Family
ID=35581455
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100497477A Expired - Fee Related CN1328703C (en) | 2005-05-08 | 2005-05-08 | Sandy soil shear volume deformation demonstrating instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1328703C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100454358C (en) * | 2006-12-14 | 2009-01-21 | 浙江大学 | Upper arch effect demonstrating instrument |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2321057Y (en) * | 1998-03-26 | 1999-05-26 | 徐万茂 | Experimental article for understanding soil property for students |
| CN2557951Y (en) * | 2002-07-25 | 2003-06-25 | 上海隧道工程股份有限公司 | Self-densing high-performance concrete investigatino instrument |
| CN2788281Y (en) * | 2005-05-08 | 2006-06-14 | 浙江大学 | Sand clay cutting cubage distorting demonstrating device |
-
2005
- 2005-05-08 CN CNB2005100497477A patent/CN1328703C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2321057Y (en) * | 1998-03-26 | 1999-05-26 | 徐万茂 | Experimental article for understanding soil property for students |
| CN2557951Y (en) * | 2002-07-25 | 2003-06-25 | 上海隧道工程股份有限公司 | Self-densing high-performance concrete investigatino instrument |
| CN2788281Y (en) * | 2005-05-08 | 2006-06-14 | 浙江大学 | Sand clay cutting cubage distorting demonstrating device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1707560A (en) | 2005-12-14 |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070725 Termination date: 20140508 |