CN201628668U - Testing device for measuring unsaturated soil water characteristic - Google Patents
Testing device for measuring unsaturated soil water characteristic Download PDFInfo
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- CN201628668U CN201628668U CN2010201413579U CN201020141357U CN201628668U CN 201628668 U CN201628668 U CN 201628668U CN 2010201413579 U CN2010201413579 U CN 2010201413579U CN 201020141357 U CN201020141357 U CN 201020141357U CN 201628668 U CN201628668 U CN 201628668U
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Abstract
The utility model relates to a testing device for measuring the unsaturated soil water characteristic, which comprises a pressure chamber 12, a pneumatic pump 21, a vacuum pump 8, a loading frame 10, an instrument base 27, hydraulic pipelines 4 and 20, and pneumatic pipelines 11 and 15. The pneumatic pipelines on the top of the pressure chamber 12 are respectively connected with a pneumatic sensor 16, a pneumatic control valve 18 and the pneumatic pump 21. A water filling pipeline 28 in the instrument base 27 is connected with a control valve 29. The hydraulic pipeline 20 in the center of a testing sample base is connected with a lower ceramic plate 14, a hydraulic sensor 9, a water volume measuring tube 17, a hydraulic control valve 19 and the pneumatic pump 21. The hydraulic pipeline 4 in the center of a top cap is connected with an upper ceramic plate 15, the hydraulic sensor 9, the water volume measuring tube 6, the hydraulic control valve 7 and the vacuum pump 8. The middle of the two ceramic plates is provided with a testing sample 30. The top cap 13, the ceramic plates 14, the testing sample 30 and the testing sample base 25 are coated by rubber film. The pressure of a weight 26 is exerted on the testing sample through the loading frame 10 and a pressuring shaft 3. The device is used for measuring the soil-water conservation curve and the unsaturated permeability coefficient of various soils under the condition of three-way loading.
Description
Technical field
The utility model is a kind of geotechnological testing tool, belongs to technical field of civil engineering.
Background technology
Unsaturated soil is widely distributed in China, the crude sedimentation soil that earth surface extensively distributes, and the soil body problem that runs in the engineering construction, it nearly all is the unsaturated soil problem, saturated soil is truly seldom seen in engineering practice, and this makes the research of unsaturated soil mechanics have very reality and practical meaning.It is a key character of unsaturated soil that waterpower lags behind, and waterpower lags behind and shows that usually Tu Shui keeps the hysteresis quality of curve, and Tu Shui keeps the hysteresis quality of curve to be subjected to multiple factor affecting, and as soil structure, temperature is the influence of stress state especially.Two important parameters that are used for describing the unsaturated soil water feature are exactly that to keep curve be the corresponding relation of soil body matric suction and water cut for unsaturation infiltration coefficient and Tu Shui.The domestic and international at present Tu Shui that also is not used for measuring under the three-dimensional stress state keeps the instrument of curve and unsaturation infiltration coefficient.The utility model is exactly that the Tu Shui that is used for measuring under the three-dimensional stress state keeps curve and two important water characteristic parameters of unsaturated soil infiltration coefficient.
Summary of the invention
The utility model purpose provides a kind of test unit that is used to measure the unsaturated soil water feature, solves the test problem that the Tu Shui of unsaturated soil under the three-dimensional stress state keeps curve and unsaturation infiltration coefficient.
Technical solution of the present utility model is characterized in that a kind of test unit that is used to measure the unsaturated soil water feature is made up of pressure chamber 12, air lift pump 21, vacuum pump 8, loading frame 10, instrument base 27, hydraulic circuit 4 and 20, pneumatic circuit 11 and 15.Wherein pressure chamber 12 is connected by bolt 2 with instrument base 27, and perpendicular displacement measuration meter 1 and pressuring shaft 3 are arranged at 12 tops, pressure chamber.The pneumatic circuit 15 at 12 tops, pressure chamber is connected with pressure chamber 12, baroceptor 16, pneumatic control valve door 18, air lift pump 21, and pressure chamber's water-filling pipeline 28 that instrument base is 27 li links to each other with by-pass valve control 29.Specimen mount 25 is installed above the instrument base 27, is inlaid with potter's clay plate 14 above the specimen mount.The hydraulic circuit 20 of specimen mount central authorities is connected with down potter's clay plate 14, hydraulic pressure sensor 9, water volume measurement pipe 17, hydraulic controlled valve 19, air lift pump 21, and water volume measures pipe 17 tops water shutoff rubber plug 5.Cap 13 bottoms, sample top are inlaid with potter's clay plate 14, and top cap central authorities hydraulic circuit 4 is connected with potter's clay plate 14, hydraulic pressure sensor 9, water volume measurement pipe 6, hydraulic controlled valve 7, vacuum pump 8, and water volume measures pipe 6 tops water shutoff rubber plug 5.In the middle of two blocks of potter's clay plates 14 sample 30 is installed, top cap 13, potter's clay plate 14, sample 30, specimen mount 25 are wrapped up by rubber diaphragm.The pneumatic circuit 11 that rubber diaphragm is passed in sample 30 middle parts is connected with sample 30, baroceptor 23, pneumatic control valve door 22, air lift pump 21.Counterweight 26 is aimed at top cap 13 top groove sample is applied pressure at right angle by increased pressure frame 10 and pressuring shaft 3.Loading frame 10 is made up of counterweight 26, lever 32, big counterweight 33, rotation axis 31, loading frame 10 is connected with instrument base 27 by gim peg 24, two rotation axiss 31 that drive framework 10 liftings connect by metal hook 34, and counterweight 26 is connected by metal hook 35 with lever 31.
Advantage of the present invention:
The instrument manufacturing is simple, and the measuring accuracy height satisfies the three-dimensional stress requirement, can measure humidification section and dehumidification section that Tu Shui keeps curve, can directly measure the unsaturation infiltration coefficient of various soil properties.
The scope of application of the present invention:
Be applicable to the Tu Shui maintenance curve of the various soil properties that run in the civil engineering work and the measurement of unsaturation infiltration coefficient.
Description of drawings:
Fig. 1 is the structural representation of unsaturated soil water characteristic test unit.Wherein have: perpendicular displacement measuration meter 1, bolt 2, pressuring shaft 3, hydraulic circuit 4, rubber plug 5, water volume measures pipe 6, hydraulic controlled valve 7, vacuum pump 8, hydraulic pressure sensor 9, loading frame 10, pneumatic circuit 11, pressure chamber 12, top cap 13, potter's clay plate 14, pneumatic circuit 15, baroceptor 16, water volume measures pipe 17, pneumatic control valve door 18, hydraulic controlled valve 19, hydraulic circuit 20, air lift pump 21, pneumatic control valve door 22, baroceptor 23, gim peg 24, specimen mount 25, counterweight 26, instrument base 27, water-filling pipeline 28, water-filling by-pass valve control 29, sample 30, rotation axis 31.
Fig. 2 is the A-A right view of Fig. 1.Wherein have: loading frame 10, gim peg 24, rotation axis 31, lever 32, big counterweight 33, metal hook 34 and 35.
Embodiment:
Embodiment: the unsaturated soil water feature is that Tu Shui keeps the mensuration of curve and unsaturation infiltration coefficient to be divided into two parts,
1) Tu Shui keeps the assay method of curve:
A. pneumatic circuit 11 is removed from air lift pump 21, hydraulic circuit 4 is connected with air lift pump 21, valve-off 18 and 22 starts air lift pump 21, opens valve 7 and 19, and it is saturated with two potter's clay plate 14 water-fillings to pressurize;
B. potter's clay plate 14 saturated after, close air lift pump 21, hydraulic circuit 4 is connected with vacuum pump 8, and valve-off 7 and 19 is connected pneumatic circuit 11 with air lift pump 21, top cap 13 and sample 30 are installed on the base 25, the outside puts rubber membrane, and pressure chamber 12 is connected by bolt 2 with base 27, by water route 28 water-filling in the pressure chamber, when treating the end face 5～10cm of water surface distance pressure chamber, valve-off 29;
C. hydraulic circuit 20 is pulled down from air lift pump 21, increased counterweight 26 by testing requirements, apply pressure at right angle on top cap 13, start air lift pump 21 simultaneously, control valve 18 applies confined pressure, and pressure valve 19 drainings of fetching boiling water are up to meeting the requirements of the sample stress state;
D. valve-off 19, and hydraulic circuit 20 is connected with air lift pump 21, and control valve 22 and valve 19 by baroceptor 23 and hydraulic pressure sensor 9, are controlled a certain size pore air pressure and pore water pressure, and the difference of the two is the matric suction s of sample
0, measure the water yield sizes that pipe 17 can be read the turnover sample by water volume, wait to measure pipe 17 liquid levels steadily after, in conjunction with known sample water cut, can draw corresponding matric suction s
0Sample water cut w
0, can obtain the battery of tests data (s on the Tu Shui maintenance curve
0-w
0);
E. control valve 22 and valve 19 by baroceptor 23 and hydraulic pressure sensor 9, change the size of sample inner pore atmospheric pressure and pore water pressure, promptly change sample matric suction s
iSize, treat water volume measure pipe 17 level change steadily after, read the water yield changing value of turnover sample, obtain new corresponding matric suction s
iSample water cut w
i, can obtain another group test figure (s on the Tu Shui maintenance curve
i-w
i);
F. by testing requirements, repeating step e can obtain the test figure on the whole piece Tu Shui maintenance curve, can draw whole piece Tu Shui and keep curve.
2) assay method of unsaturation infiltration coefficient:
A. pneumatic circuit 11 is removed from air lift pump 21, hydraulic circuit 4 is connected with air lift pump 21, valve-off 18 and 22 starts air lift pump 21, opens valve 7 and 19, and it is saturated with two potter's clay plate 14 water-fillings to pressurize;
B. potter's clay plate 14 saturated after, close air lift pump 21, hydraulic circuit 4 is connected with vacuum pump 8, and valve-off 7 and 19 is connected pneumatic circuit 11 with air lift pump 21, top cap 13 and sample 30 are installed on the base 25, the outside puts rubber membrane, and pressure chamber 12 is connected by bolt 2 with base 27, by water route 28 water-filling in the pressure chamber, when treating the end face 5～10cm of water surface distance pressure chamber, valve-off 29;
C. hydraulic circuit 20 is pulled down from air lift pump 21, increased counterweight 26 by testing requirements, apply pressure at right angle on top cap 13, start air lift pump 21 simultaneously, control valve 18 applies confined pressure, and pressure valve 19 drainings of fetching boiling water are up to meeting the requirements of the sample stress state;
D. valve-off 19, and hydraulic circuit 20 is connected with air lift pump 21, start vacuum pump 8, and control valve 22 and 19 by baroceptor 23 and hydraulic pressure sensor 9, is controlled a certain size pore air pressure and pore water pressure, promptly controls the matric suction s of sample
0, measure the water yield sizes that pipe 17 is read the turnover sample by water volume, wait to measure pipe 17 level change stable after, obtain the sample water cut w of corresponding matric suction
0Control valve 19, increase pore water pressure slightly, make that measuring pipe 17 liquid levels evenly slowly descends control valve 7, make that measuring pipe 6 liquid levels evenly slowly rises, be consistent with measuring pipe 17 numerical value on the numerical value, guarantee that the water yield of discrepancy sample equates, guarantee that promptly the sample interior moisture content is constant, measure pipe 17 water volume changing values in the record certain hour, can obtain corresponding matric suction s
0The unsaturation infiltration coefficient;
E. valve-off 7, and control valve 22 and 19 changes hole air pressure and pore water pressure size, promptly changes sample matric suction s
i, treat that water volume measures pipe 17 vary stable after, water cut reaches balance in the expression sample, obtains the sample water cut w of corresponding matric suction si
0Control valve 19, increase pore water pressure slightly, make that measuring pipe 17 liquid levels evenly slowly descends control valve 7, make that measuring pipe 6 liquid levels evenly slowly rises, be consistent with measuring pipe 17 numerical value on the numerical value, guarantee that the water yield of discrepancy sample equates, guarantee that promptly the sample interior moisture content is constant, measure pipe 17 water volume changing values in the record certain hour, can obtain corresponding matric suction value s
iThe unsaturation infiltration coefficient;
F. by testing requirements, repeating step e can obtain the unsaturation infiltration coefficient under the sample different substrates suction value.
Claims (1)
1. test unit that is used to measure the unsaturated soil water feature, it is characterized in that this device is by pressure chamber (12), air lift pump (21), vacuum pump (8), loading frame (10), instrument base (27), hydraulic circuit (4) (20), pneumatic circuit (11) (15) is formed, pressure chamber (12) is connected by bolt (2) with instrument base (27), perpendicular displacement measuration meter (1) and pressuring shaft (3) are arranged at top, pressure chamber (12), the pneumatic circuit (15) at top, pressure chamber (12) is connected with pressure chamber (12), baroceptor (16), pneumatic control valve door (18), air lift pump (21), pressure chamber's water-filling pipeline (28) of instrument base (27) lining links to each other with by-pass valve control (29), specimen mount (25) is installed above the instrument base (27), be inlaid with potter's clay plate (14) above the specimen mount, the hydraulic circuit of specimen mount central authorities (20) is connected with down potter's clay plate (14), hydraulic pressure sensor (9), water volume measures pipe (17), hydraulic controlled valve (19), air lift pump (21), water volume measures pipe (17) top water shutoff rubber plug (5), sample top cap (13) bottom is inlaid with potter's clay plate (14), top cap central authorities' hydraulic circuits (4) are connected with potter's clay plate (14), hydraulic pressure sensor (9), water volume measures pipe (6), hydraulic controlled valve (7), vacuum pump (8), water volume measures pipe (6) top water shutoff rubber plug (5), and sample (30) is installed in the middle of two blocks of potter's clay plates (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201413579U CN201628668U (en) | 2010-03-26 | 2010-03-26 | Testing device for measuring unsaturated soil water characteristic |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201413579U CN201628668U (en) | 2010-03-26 | 2010-03-26 | Testing device for measuring unsaturated soil water characteristic |
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| CN201628668U true CN201628668U (en) | 2010-11-10 |
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| CN2010201413579U Expired - Fee Related CN201628668U (en) | 2010-03-26 | 2010-03-26 | Testing device for measuring unsaturated soil water characteristic |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590016A (en) * | 2012-02-16 | 2012-07-18 | 中国农业大学 | Soil moisture characteristic curve measurement device and measurement method thereof |
| CN103091222A (en) * | 2013-01-04 | 2013-05-08 | 西南交通大学 | Device for simulating and testing water burst of tunnel fissure |
| CN107014975A (en) * | 2017-03-15 | 2017-08-04 | 哈尔滨工业大学深圳研究生院 | The measurable unsaturated water force characteristic measurement apparatus of axle/radial deformation and measuring method |
| CN108896743A (en) * | 2018-08-06 | 2018-11-27 | 中山大学 | A kind of multifunctional visible joint consolidation apparatus device |
| CN109991114A (en) * | 2019-03-12 | 2019-07-09 | 桂林理工大学 | The retentiveness parameter test device of soil containing Tetrahydrofuran hydrate and its method |
| CN111504874A (en) * | 2020-04-28 | 2020-08-07 | 南京工业大学 | Saturated and unsaturated soil and water characteristic parameter testing device and experimental 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 |
-
2010
- 2010-03-26 CN CN2010201413579U patent/CN201628668U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102590016A (en) * | 2012-02-16 | 2012-07-18 | 中国农业大学 | Soil moisture characteristic curve measurement device and measurement method thereof |
| CN102590016B (en) * | 2012-02-16 | 2013-11-06 | 中国农业大学 | Measurement method of soil moisture characteristic curve measurement device |
| CN103091222A (en) * | 2013-01-04 | 2013-05-08 | 西南交通大学 | Device for simulating and testing water burst of tunnel fissure |
| CN103091222B (en) * | 2013-01-04 | 2014-12-10 | 西南交通大学 | Device for simulating and testing water burst of tunnel fissure |
| CN107014975A (en) * | 2017-03-15 | 2017-08-04 | 哈尔滨工业大学深圳研究生院 | The measurable unsaturated water force characteristic measurement apparatus of axle/radial deformation and measuring method |
| CN107014975B (en) * | 2017-03-15 | 2019-08-02 | 哈尔滨工业大学深圳研究生院 | The measurable unsaturated water force characteristic measuring device and measuring method of axis/radial deformation |
| CN108896743A (en) * | 2018-08-06 | 2018-11-27 | 中山大学 | A kind of multifunctional visible joint consolidation apparatus device |
| CN108896743B (en) * | 2018-08-06 | 2023-05-23 | 中山大学 | Multifunctional visual combined consolidation apparatus device |
| CN109991114A (en) * | 2019-03-12 | 2019-07-09 | 桂林理工大学 | The retentiveness parameter test device of soil containing Tetrahydrofuran hydrate and its method |
| CN111504874A (en) * | 2020-04-28 | 2020-08-07 | 南京工业大学 | Saturated and unsaturated soil and water characteristic parameter testing device and experimental method |
| CN111504874B (en) * | 2020-04-28 | 2022-06-10 | 南京工业大学 | Saturated and unsaturated soil and water characteristic parameter testing device and experimental 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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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: 20101110 Termination date: 20160326 |