CN103743882B - A kind of unsaturated soil air-entry value determinator - Google Patents
A kind of unsaturated soil air-entry value determinator Download PDFInfo
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- CN103743882B CN103743882B CN201310716611.1A CN201310716611A CN103743882B CN 103743882 B CN103743882 B CN 103743882B CN 201310716611 A CN201310716611 A CN 201310716611A CN 103743882 B CN103743882 B CN 103743882B
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Abstract
A kind of unsaturated soil air-entry value determinator, it comprises cover plate, pressure chamber's sidewall, pottery clay plates, pedestal, water inlet pipe, without water pressure discharge water yield pipe and stand, described cover plate, the test space that pressure chamber's sidewall and pedestal composition are closed, the air inlet pipeline be communicated with pressure gas source is on the cover board set, described pottery clay plates is fixed on pedestal, the inlet pipeline be communicated with water inlet pipe is set at base central position, the outlet pipeline be communicated with without water pressure discharge water yield pipe is set in the side of pedestal, described water inlet pipe and without water pressure discharge water yield pipe be arranged on respectively both sides arrange stand on, described pedestal is arranged isometric helix line style drainage groove.The present invention makes base bottom bubble automatically discharge with current by drainage groove, and the error that bubble brings is not counted in water discharge measured value, and then ensure that the accuracy of test result.
Description
Technical field
The present invention relates to a kind of proving installation, especially a kind of proving installation being applicable to unsaturated soil air-entry value and measuring, belongs to technical field of measurement and test.
Background technology
The air-entry value (AEV) of unsaturated soil refers to and causes inside soil body maximum pore to produce the necessary matric suction of unsaturation, and it divides the important parameter that the soil body is in fractional saturation (saturated) and unsaturated state.The precision of air-entry value has larger impact on starting point at the dehumidification sweep trace in high saturation district, also plays vital effect for capillary accumulation type design of impervious layer simultaneously.Therefore, the air-entry value of Accurate Determining material becomes a very important job in the test of native water family curve.
Pressure plate apparatus is one of basic equipment measuring soil-water characteristic curve, conventional testing tool is FredlundSWCC soil-water characteristic curve pressure plate apparatus, application number be 201120271620.0 Chinese invention patent also provide a kind of native water characteristic curve tester, when adopting above-mentioned instrument to carry out unsaturated soil air-entry value mensuration process, general hypothesis soil body launching stress is zero, apply air pressure and matric suction, but, draining buret is often fixed on instrument stand, in draining buret, initial level is generally higher than about soil sample 20CM, the water pressure of 2KPa will be produced like this under soil, and constantly rise along with water level in draining buret, this water pressure being often present in the change in soil has obvious impact for the measuring accuracy of unsaturated soil air-entry value.Simultaneously, due to migration effect, bubble is there is under pottery clay plates, bubble collects in discharge pipe line, and its volume is easily pronounced water discharge mistakenly, and then have impact on the accuracy of water discharge test, for addressing this problem, bubble is discharged by the method that employing is washed away repeatedly mostly at present, so not only makes operation steps more loaded down with trivial details, too increases the difficulty of test job.Therefore, development one makes soil sample all be in zero hydraulic pressure gradient state in dehydration, wetting process, and automatically can discharge the unsaturated soil air-entry value determinator of pedestal bubble, for accurately testing air-entry value and native water family curve important in inhibiting.
Summary of the invention
The object of the invention is to the drawback for prior art, provide one base bottom bubble can be discharged automatically, and ensure the unsaturated soil air-entry value determinator without water pressure under soil sample in test process.
Problem of the present invention realizes with following technical proposals:
A kind of unsaturated soil air-entry value determinator, it comprises cover plate, pressure chamber's sidewall, pottery clay plates, pedestal, water inlet pipe, without water pressure discharge water yield pipe and stand, described cover plate, the test space that pressure chamber's sidewall and pedestal composition are closed, the air inlet pipeline be communicated with pressure gas source is on the cover board set, described pottery clay plates is fixed on pedestal, the inlet pipeline be communicated with water inlet pipe is set at base central position, the outlet pipeline be communicated with without water pressure discharge water yield pipe is set in the side of pedestal, described water inlet pipe and without water pressure discharge water yield pipe be arranged on respectively both sides arrange stand on, its special feature is: described pedestal is arranged the drainage groove that xsect is isometric helix line style.
Above-mentioned unsaturated soil air-entry value determinator, the described drainage groove degree of depth outwards to be tapered off trend by its center, and the drainage groove degree of depth in heart position is maximal value wherein, arranges the inlet opening be communicated with inlet pipeline at drainage groove center position.
Above-mentioned unsaturated soil air-entry value determinator, the described drainage groove end degree of depth is minimum value, arranges the apopore be communicated with outlet pipeline at drainage groove end.
Above-mentioned unsaturated soil air-entry value determinator, described without water pressure discharge water yield pipe top employing throat structure, without water pressure discharge water yield pipe and pottery clay plates top contour position, a side ingress pipe is being set, ingress pipe one end, described side is connected with outlet pipeline, the other end inserts without in water pressure discharge water yield pipe, side ingress pipe and without α=80 °, water pressure discharge water yield pipe clamp angle.
Above-mentioned unsaturated soil air-entry value determinator, arranges water inlet control valve door bottom described water inlet pipe.
Above-mentioned unsaturated soil air-entry value determinator, described outlet pipeline sets out water control valve.
Above-mentioned unsaturated soil air-entry value determinator, describedly arranges draining control valve door without bottom water pressure discharge water yield pipe.
Above-mentioned unsaturated soil air-entry value determinator, described air inlet pipeline is arranged air intake control valve door.
It is isometric helix line style drainage groove that the present invention arranges xsect in pedestal, its apopore and inlet opening one high and one low, the high apopore being positioned at drainage groove end is connected with without water pressure discharge water yield pipe, and the low inlet opening being positioned at drainage groove center position is connected with water inlet pipe.When carrying out unsaturated soil air-entry value and measuring, after bubble generates in drainage groove, by buoyancy bubble floating, bubble enters in rising pipe through the high apopore of spiral line type drainage groove, finally by without the discharge suitable for reading of water pressure discharge water yield pipe, do not enter in the water of buret bottom, automatically like this avoid the impact of air on measurement result; Side ingress pipe without water pressure discharge water yield pipe is designed to the height consistent with pottery clay plates end face by the present invention, makes tested soil sample hydraulic gradient in draining, immersion process be zero, ensure that the accuracy of test result.In a word, the present invention makes base bottom bubble automatically discharge by the drainage groove be arranged on pedestal, eliminate the troublesome operation step of repeatedly washing away, have employed designing without water pressure discharge water yield pipe of zero head simultaneously, both to have ensure that in unsaturated soil air-entry value mensuration process bottom pottery clay plates without water pressure, improve the precision that matric suction controls, in turn ensure that the error that bubble brings is not counted in water discharge measured value, and then ensure that the accuracy of test result.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is structural representation of the present invention;
Fig. 2 is pedestal cross-sectional view;
Fig. 3 is pedestal vertical view;
Fig. 4 is without water pressure discharge water yield tubular construction schematic diagram.
In figure, each list of reference numerals is: 1, water inlet pipe, 2, water inlet control valve door, 3, inlet pipeline, 4, pedestal, 4-1, drainage groove, 4-2, inlet opening, 4-3, apopore, 5, outlet pipeline, 6, outlet water control valve door, 7, without water pressure discharge water yield pipe, 7-1, survey ingress pipe, 7-2, throat structure, 8, pottery clay plates, 9, soil sample, 10, pressure chamber's sidewall, 11, fastening bolt, 12, cover plate, 13, air intake control valve door, 14, air inlet pipeline, 15, stand, 16, draining control valve door.
Embodiment
Referring to Fig. 1, the present invention includes cover plate 12, pressure chamber's sidewall 10, pottery clay plates 8, pedestal 4, water inlet pipe 1, without water pressure discharge water yield pipe 7 and stand 15, described cover plate 12, pressure chamber's sidewall 10 and pedestal 4 form the test space closed, cover plate 12 and pedestal 4 are fastenedly connected by fastening bolt 11, cover plate 12 arranges the air inlet pipeline 14 be communicated with pressure gas source, described pottery clay plates 8 is fixed on pedestal 4, the inlet pipeline 3 be communicated with water inlet pipe 1 is set in the centre of pedestal 4, the outlet pipeline 5 be communicated with without water pressure discharge water yield pipe 7 is set in the side of pedestal 4, described water inlet pipe 1 and without water pressure discharge water yield pipe 7 be arranged on respectively both sides arrange stand 15 on, described pedestal 4 is arranged isometric helix line style drainage groove 4-1.
Referring to Fig. 1, the present invention arranges water inlet control valve door 2 bottom water inlet pipe 1, and outlet pipeline 5 sets out water control valve 6, arranging draining control valve door 16 without bottom water pressure discharge water yield pipe 7, air inlet pipeline 14 arranges air intake control valve door 13.
Referring to Fig. 2, Fig. 3, the degree of depth of drainage groove 4-1 of the present invention outwards to be tapered off trend by its center, the drainage groove degree of depth in heart position is maximal value wherein, the inlet opening 4-2 be communicated with inlet pipeline is set at drainage groove 4 center position, the drainage groove 4-1 end degree of depth is minimum value, arranges the apopore 4-3 be communicated with outlet pipeline at drainage groove 4 end.
Referring to Fig. 4, of the present invention without water pressure discharge water yield pipe 7 top employing throat structure 7-2, decrease the evaporation without moisture in water pressure discharge water yield pipe 7 in test process, in the position contour without water pressure discharge water yield pipe 7 and pottery clay plates 8 end face, a side ingress pipe 7-1 is set, ingress pipe 7-1 one end, described side is connected with pedestal apopore 4-3, the other end inserts without in water pressure discharge water yield pipe 7, side ingress pipe 7-1 and angle α=80 ° without water pressure discharge water yield pipe 7.
The present invention arranges isometric helix line style drainage groove 4-1 in pedestal 4, its apopore 4-3 and inlet opening 4-2 is one high and one low, the high apopore 4-3 being positioned at drainage groove end is connected with without water pressure discharge water yield pipe 7, and the low inlet opening 4-2 being positioned at drainage groove center position is connected with water inlet pipe 1.Before the test carrying out drainage curve, inlet valve 2 and water discharging valve 6 are opened, discharge the gas in groove, then close water discharging valve 6 and inlet valve 2 successively, open without water pressure discharge water yield tube valve 16, close after superfluous water is discharged.When carrying out unsaturated soil air-entry value and measuring, the air of pressure indoor section is soluble in water, enter in drainage groove 4-1 by high air-entry value pottery clay plates 8, bubble is formed on the bottom that air can gather eminence and pottery clay plates 8, bubble is discharged by high apopore 4-3 through spiral line type drainage groove 4-1 with current, because this reducing the impact of air on test findings.
Claims (7)
1. a unsaturated soil air-entry value determinator, it comprises cover plate (12), pressure chamber's sidewall (10), pottery clay plates (8), pedestal (4), water inlet pipe (1), without water pressure discharge water yield pipe (7) and stand (15), described cover plate (12), the test space that pressure chamber's sidewall (10) and pedestal (4) composition are closed, the air inlet pipeline (14) be communicated with pressure gas source is above set at cover plate (12), described pottery clay plates (8) is fixed on pedestal (4), the inlet pipeline (3) be communicated with water inlet pipe (1) is set in the centre of pedestal (4), the outlet pipeline (5) be communicated with without water pressure discharge water yield pipe (7) is set in the side of pedestal (4), described water inlet pipe (1) and without water pressure discharge water yield pipe (7) be arranged on respectively both sides arrange stand (15) on, it is characterized in that, described pedestal (4) is arranged isometric helix line style drainage groove (4-1),
The degree of depth of described drainage groove (4-1) outwards to be tapered off trend by its center, and the drainage groove degree of depth in heart position is maximal value wherein, arranges the inlet opening (4-2) be communicated with inlet pipeline at drainage groove (4-1) center position.
2. a kind of unsaturated soil air-entry value determinator according to claim 1, is characterized in that, described drainage groove (4-1) the end degree of depth is minimum value, arranges the apopore (4-3) be communicated with outlet pipeline at drainage groove (4-1) end.
3. a kind of unsaturated soil air-entry value determinator according to claim 2, it is characterized in that, described without water pressure discharge water yield pipe (7) top employing throat structure (7-2), in the position contour without water pressure discharge water yield pipe (7) and pottery clay plates (8) end face, a side ingress pipe (7-1) is set, described side ingress pipe (7-1) one end is connected with pedestal apopore (4-3), the other end inserts without in water pressure discharge water yield pipe (7), side ingress pipe (7-1) and angle α=80 ° without water pressure discharge water yield pipe (7).
4. a kind of unsaturated soil air-entry value determinator according to claim 3, is characterized in that, described water inlet pipe (1) bottom arranges water inlet control valve door (2).
5. a kind of unsaturated soil air-entry value determinator according to claim 4, is characterized in that, described outlet pipeline (5) sets out water control valve (6).
6. a kind of unsaturated soil air-entry value determinator according to claim 5, is characterized in that, described without water pressure discharge water yield pipe (7) bottom draining control valve door (16) is set.
7. a kind of unsaturated soil air-entry value determinator according to claim 6, is characterized in that, described air inlet pipeline (14) is arranged air intake control valve door (13).
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310716611.1A CN103743882B (en) | 2013-12-23 | 2013-12-23 | A kind of unsaturated soil air-entry value determinator |
| US14/768,621 US9453829B2 (en) | 2013-12-23 | 2014-12-22 | Soil property test device |
| PCT/CN2014/094458 WO2015096672A1 (en) | 2013-12-23 | 2014-12-22 | Detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310716611.1A CN103743882B (en) | 2013-12-23 | 2013-12-23 | A kind of unsaturated soil air-entry value determinator |
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| CN103743882A CN103743882A (en) | 2014-04-23 |
| CN103743882B true CN103743882B (en) | 2016-01-20 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9453829B2 (en) | 2013-12-23 | 2016-09-27 | Shijiazhuang Tiedao University | Soil property test device |
| CN104034385B (en) * | 2014-07-02 | 2017-02-01 | 南京泰克奥科技有限公司 | Fully automatic diffusion bubble scour measuring instrument used for unsaturated soil test |
| CN105910941B (en) * | 2016-04-12 | 2018-10-23 | 天津城建大学 | The test method of content of unfrozen water in frozen earth based on pressure plate apparatus |
| CN109356576B (en) * | 2018-10-23 | 2022-05-03 | 中国石油化工股份有限公司 | Object model experiment device for measuring plane radial flow displacement pressure gradient |
| CN111238565B (en) * | 2019-12-06 | 2022-05-10 | 重庆交通大学 | Test method for testing unsaturated geotechnical characteristic relation |
| CN114563274A (en) * | 2022-01-14 | 2022-05-31 | 温州大学 | Consolidation apparatus clay plate exhaust device and exhaust method |
| CN115979880B (en) * | 2022-11-25 | 2023-06-20 | 中国矿业大学 | Device and method for testing near-surface soil water retention curve under low-stress environment |
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| US6718835B2 (en) * | 2001-10-10 | 2004-04-13 | Wisconsin Alumni Research Foundation | Pressure plate extractor |
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| CN1645100A (en) * | 2005-01-24 | 2005-07-27 | 东南大学 | Unsaturated soil solidifying and water characteristic curve combining tester and testing method |
| CN101672761A (en) * | 2009-09-29 | 2010-03-17 | 长安大学 | Device and method for testing soil-water characteristic curve of sandy soil |
| CN102445528A (en) * | 2010-09-10 | 2012-05-09 | 香港科技大学 | Humidity and osmotic suction-controlled box |
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