CN103743882A - Device for measuring air entry value of unsaturated soil - Google Patents
Device for measuring air entry value of unsaturated soil Download PDFInfo
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- CN103743882A CN103743882A CN201310716611.1A CN201310716611A CN103743882A CN 103743882 A CN103743882 A CN 103743882A CN 201310716611 A CN201310716611 A CN 201310716611A CN 103743882 A CN103743882 A CN 103743882A
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Abstract
The invention discloses a device for measuring the air entry value of unsaturated soil. The device comprises a cover plate, pressure chamber sidewalls, a pottery clay plate, a substrate, a water inlet pipe, a water pressure-free water discharge measuring pipe and a rack, wherein the cover plate, the pressure chamber sidewalls and the substrate form a closed test space; an air inlet pipeline communicated with a pressure air source is arranged on the cover plate; the pottery clay plate is fixed on the substrate; a water inlet pipeline communicated with the water inlet pipe is arranged on the central part of the substrate; a water outlet pipeline communicated with the water pressure-free water discharge measuring pipe is arranged on one side of the substrate; the water inlet pipe and the water pressure-free water discharge measuring pipe are arranged on the rack on the two sides, respectively; isometric helical line type water discharge grooves are formed in the substrate. According to the device, bubbles at the bottom of the substrate are automatically discharged along with water flow through the water discharge grooves, and errors caused by the bubbles are not counted into a measured water discharge value, so that the accuracy of a test result is ensured.
Description
Technical field
The present invention relates to a kind of proving installation, especially a kind of proving installation that is applicable to unsaturated soil air-entry value mensuration, belongs to technical field of measurement and test.
Background technology
The air-entry value (AEV) of unsaturated soil refers to and causes that inside soil body maximum pore produces unsaturation necessary matric suction, it be divide the soil body in fractional saturation (saturated) important parameter with 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 native water family curve test.
Pressure plate apparatus is one of basic equipment of measuring native water characteristic curve, conventional testing tool is Fredlund SWCC soil water characteristic curve pressure plate apparatus, the Chinese invention patent that application number is 201120271620.0 also provides 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, applying air pressure is matric suction, but, draining buret is often fixed on instrument stand, in draining buret, initial liquid level generally will be higher than soil sample 20CM left and right, will under soil, produce like this water pressure of 2KPa, and along with water level in draining buret constantly rises, this water pressure that is often present in the variation in soil has obvious impact for the measuring accuracy of unsaturated soil air-entry value.Simultaneously, due to migration effect, under pottery clay plates, there is bubble, bubble collects in discharge pipe line, and its volume is easily pronounced water discharge mistakenly, and then has affected the accuracy of water discharge test, for addressing this problem, the method that employing is washed away repeatedly mostly is at present discharged bubble, so not only makes operation steps more loaded down with trivial details, has also increased the difficulty of test job.Therefore, development one make soil sample in dehydration, soak process in all in zero hydraulic pressure gradient state, and can automatically discharge the unsaturated soil air-entry value determinator of pedestal bubble, for accurate test 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 guarantee in test process the unsaturated soil air-entry value determinator without water pressure under soil sample.
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 of pressure chamber's sidewall and the sealing of pedestal composition, the air inlet pipeline being communicated with pressure gas source is on the cover board set, described pottery clay plates is fixed on pedestal, the inlet pipeline being communicated with water inlet pipe is set in pedestal centre, at a side setting of pedestal and the outlet pipeline being communicated with without water pressure discharge water yield pipe, 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: the drainage groove that xsect is isometric helix line style is set on described pedestal.
Above-mentioned unsaturated soil air-entry value determinator, the described drainage groove degree of depth is by its center trend that outwards tapers off, and the drainage groove degree of depth in heart position is maximal value therein, the inlet opening being communicated with inlet pipeline the setting of drainage groove center position.
Above-mentioned unsaturated soil air-entry value determinator, the described drainage groove end degree of depth is minimum value, the apopore being communicated with outlet pipeline the setting of drainage groove end.
Above-mentioned unsaturated soil air-entry value determinator, described without water pressure discharge water yield pipe top employing throat structure, a side ingress pipe is set pushing up contour position without water pressure discharge water yield pipe and pottery clay plates, described side ingress pipe one end is connected with outlet pipeline, the other end inserts without in water pressure discharge water yield pipe, side ingress pipe with without α=80 °, water pressure discharge water yield pipe clamp angle.
Above-mentioned unsaturated soil air-entry value determinator, described water inlet pipe bottom arranges water inlet control valve door.
Above-mentioned unsaturated soil air-entry value determinator, sets out water control valve on described outlet pipeline.
Above-mentioned unsaturated soil air-entry value determinator, describedly arranges draining control valve door without water pressure discharge water yield pipe bottom.
Above-mentioned unsaturated soil air-entry value determinator, arranges air intake control valve door on described air inlet pipeline.
It is isometric helix line style drainage groove that the present invention arranges xsect in pedestal, its apopore and inlet opening are one high and one low, be positioned at the high apopore of drainage groove end and be connected without water pressure discharge water yield pipe, the low inlet opening that is positioned at drainage groove center position is connected with water inlet pipe.When carrying out unsaturated soil air-entry value mensuration, after bubble generates in drainage groove, be subject to 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 avoided the impact of air on measurement result; The present invention will be designed to the height consistent with pottery clay plates end face without the side ingress pipe of water pressure discharge water yield pipe, and making tested soil sample hydraulic gradient in draining, immersion process is zero, has guaranteed the accuracy of test result.In a word, the present invention can discharge base bottom bubble by the drainage groove being arranged on pedestal automatically, removed the troublesome operation step of repeatedly washing away from, adopted designing without water pressure discharge water yield pipe of zero head simultaneously, both guaranteed in unsaturated soil air-entry value mensuration process that pottery clay plates bottom was without water pressure, improved the precision of matric suction control, guaranteed that again the error that bubble brings is not counted in water discharge measured value, and then guaranteed 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, the test space of pressure chamber's sidewall 10 and pedestal 4 composition sealings, cover plate 12 is fastenedly connected by fastening bolt 11 with pedestal 4, the air inlet pipeline 14 being communicated with pressure gas source is set on cover plate 12, described pottery clay plates 8 is fixed on pedestal 4, centre at pedestal 4 arranges the inlet pipeline 3 being communicated with water inlet pipe 1, at a side setting of pedestal 4 and the outlet pipeline 5 being communicated with without water pressure discharge water yield pipe 7, described water inlet pipe 1 and without water pressure discharge water yield pipe 7 be arranged on respectively both sides arrange stand 15 on, isometric helix line style drainage groove 4-1 is set on described pedestal 4.
Referring to Fig. 1, the present invention arranges water inlet control valve door 2 in water inlet pipe 1 bottom, sets out water control valve 6 on outlet pipeline 5, without water pressure discharge water yield pipe 7 bottoms, draining control valve door 16 being set, air intake control valve door 13 is set on air inlet pipeline 14.
Referring to Fig. 2, Fig. 3, the degree of depth of drainage groove 4-1 of the present invention is by its center trend that outwards tapers off, the drainage groove degree of depth in heart position is maximal value therein, the inlet opening 4-2 being communicated with inlet pipeline in drainage groove 4 center position settings, the drainage groove 4-1 end degree of depth is minimum value, the apopore 4-3 being communicated with outlet pipeline in drainage groove 4 end settings.
Referring to Fig. 4, of the present invention without water pressure discharge water yield pipe 7 tops employing throat structure 7-2, reduced the evaporation without water pressure discharge water yield pipe 7 interior moisture in test process, without the contour position of water pressure discharge water yield pipe 7 and pottery clay plates 8 end faces, a side ingress pipe 7-1 is being 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.
The present invention arranges isometric helix line style drainage groove 4-1 in pedestal 4, its apopore 4-3 and inlet opening 4-2 are one high and one low, the high apopore 4-3 that is positioned at drainage groove end with without water pressure discharge water yield pipe 7, be connected, the low inlet opening 4-2 that is positioned at drainage groove center position is connected with water inlet pipe 1.Carrying out before the test of drainage curve, inlet valve 2 and water discharging valve 6 are opened, discharge the gas in groove, then close successively water discharging valve 6 and inlet valve 2, open without water pressure discharge water yield tube valve 16, after being discharged, superfluous water closes.When carrying out unsaturated soil air-entry value mensuration, the air of pressure indoor section is soluble in water, by high air-entry value pottery clay plates 8, enter in drainage groove 4-1, air can gather the bottom formation bubble that eminence is pottery clay plates 8, bubble, with being discharged by high apopore 4-3 through spiral line type drainage groove 4-1 with current, has therefore reduced the impact of air on test findings.
Claims (8)
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 of pressure chamber's sidewall (10) and the sealing of pedestal (4) composition, at the upper air inlet pipeline (14) being communicated with pressure gas source that arranges of cover plate (12), described pottery clay plates (8) is fixed on pedestal (4), centre at pedestal (4) arranges the inlet pipeline (3) being communicated with water inlet pipe (1), at a side setting of pedestal (4) and the outlet pipeline (5) being communicated with without water pressure discharge water yield pipe (7), 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, isometric helix line style drainage groove (4-1) is set on described pedestal (4).
2. a kind of unsaturated soil air-entry value determinator according to claim 1, it is characterized in that, the degree of depth of described drainage groove (4-1) is by its center trend that outwards tapers off, the drainage groove degree of depth in heart position is maximal value therein, the inlet opening (4-2) being communicated with inlet pipeline in drainage groove (4) center position setting.
3. a kind of unsaturated soil air-entry value determinator according to claim 2, is characterized in that, described drainage groove (4-1) the end degree of depth is minimum value, the apopore (4-3) being communicated with outlet pipeline in drainage groove (4) end setting.
4. a kind of unsaturated soil air-entry value determinator according to claim 3, it is characterized in that, described without water pressure discharge water yield pipe (7) top employing throat structure (7-2), without the contour position of water pressure discharge water yield pipe (7) and pottery clay plates (8) end face, a side ingress pipe (7-1) is being 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).
5. a kind of unsaturated soil air-entry value determinator according to claim 4, is characterized in that, described water inlet pipe (1) bottom arranges water inlet control valve door (2).
6. a kind of unsaturated soil air-entry value determinator according to claim 5, is characterized in that, sets out water control valve (6) on described outlet pipeline (5).
7. a kind of unsaturated soil air-entry value determinator according to claim 6, is characterized in that, describedly without water pressure discharge water yield pipe (7) bottom, draining control valve door (16) is set.
8. a kind of unsaturated soil air-entry value determinator according to claim 7, is characterized in that, air intake control valve door (13) is set on described air inlet pipeline (14).
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 |
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| 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 |
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| CN103743882A true CN103743882A (en) | 2014-04-23 |
| CN103743882B CN103743882B (en) | 2016-01-20 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104034385A (en) * | 2014-07-02 | 2014-09-10 | 南京力淮软件科技有限公司 | Fully automatic diffusion bubble scour measuring instrument used for unsaturated soil test |
| WO2015096672A1 (en) * | 2013-12-23 | 2015-07-02 | 石家庄铁道大学 | Detection device |
| CN105910941A (en) * | 2016-04-12 | 2016-08-31 | 天津城建大学 | Test method for frozen soil unfrozen-water content based on pressure plate apparatus |
| CN109356576A (en) * | 2018-10-23 | 2019-02-19 | 中国石油化工股份有限公司 | Measure the logistics organizations device of radial fluid flow displacement pressure gradient |
| CN111238565A (en) * | 2019-12-06 | 2020-06-05 | 重庆交通大学 | Device and 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 |
| CN115979880A (en) * | 2022-11-25 | 2023-04-18 | 中国矿业大学 | Device and method for testing near-surface soil water retention curve in low-stress environment |
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Patent Citations (7)
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| US20030066211A1 (en) * | 2001-10-10 | 2003-04-10 | Xiaodong Wang | Pressure plate extractor |
| 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 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015096672A1 (en) * | 2013-12-23 | 2015-07-02 | 石家庄铁道大学 | Detection device |
| US9453829B2 (en) | 2013-12-23 | 2016-09-27 | Shijiazhuang Tiedao University | Soil property test device |
| CN104034385A (en) * | 2014-07-02 | 2014-09-10 | 南京力淮软件科技有限公司 | Fully automatic diffusion bubble scour measuring instrument used for unsaturated soil test |
| 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 |
| CN105910941A (en) * | 2016-04-12 | 2016-08-31 | 天津城建大学 | Test method for frozen soil unfrozen-water content based on pressure plate apparatus |
| CN109356576A (en) * | 2018-10-23 | 2019-02-19 | 中国石油化工股份有限公司 | Measure the logistics organizations device of radial fluid flow displacement pressure gradient |
| CN111238565A (en) * | 2019-12-06 | 2020-06-05 | 重庆交通大学 | Device and method for testing unsaturated geotechnical characteristic relation |
| 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 |
| CN115979880A (en) * | 2022-11-25 | 2023-04-18 | 中国矿业大学 | Device and method for testing near-surface soil water retention curve in low-stress environment |
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| CN103743882B (en) | 2016-01-20 |
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