CN203365432U - Soil-water characteristic curve testing instrument applicable to special coarse-grained soil - Google Patents
Soil-water characteristic curve testing instrument applicable to special coarse-grained soil Download PDFInfo
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- CN203365432U CN203365432U CN 201320493752 CN201320493752U CN203365432U CN 203365432 U CN203365432 U CN 203365432U CN 201320493752 CN201320493752 CN 201320493752 CN 201320493752 U CN201320493752 U CN 201320493752U CN 203365432 U CN203365432 U CN 203365432U
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Abstract
The utility model discloses a soil-water characteristic curve testing instrument applicable to special coarse-grained soil. The soil-water characteristic curve testing instrument comprises a base and an organic glass cylinder provided with a permeable stone at the bottom, wherein the bottom of the organic glass cylinder is connected with a water container through a drain pipe; a top cover provided with a water inlet is mounted at the top of the organic glass cylinder; the organic glass cylinder is communicated with a first water storage container through a first water guide pipe communicated with the water inlet in the top cover; a permeable plate is arranged at the top of a soil sample located in the organic glass cylinder; an opening is formed in the position, flush with the height of the permeable plate, of the side wall of the organic glass cylinder; the opening is connected with a second water storage container through a second water guide pipe; and a moisture transducer and a porewater pressure transducer are mounted in the organic glass cylinder. The soil-water characteristic curve testing instrument is convenient to operate, can effectively improve the test efficiency, reduces the workload of manual record and improves the measurement accuracy simultaneously, thereby being applicable to small-size special coarse-grained soil such as sand soil, gravel soil, crushed stone soil and the like.
Description
technical field:
The utility model belongs to technical field of civil engineering, the relevant earthwork test Instrument of native water characteristic curve that relates to a kind of unsaturated soil, especially relate to a kind of native water characteristic curve tester that is applicable to the particle diameter special coarse-grained soils less than normal such as sand class, gravel class, rubble class, for the unsaturated soil mechanics soil water characteristic curve testing research in Geotechnical Engineering field.
background technology:
Unsaturated soil soil water characteristic curve is water cut for describing the soil body and the relation between matric suction.The research of soil water characteristic is most important for analyzing relevant unsaturated soil problem, involved unsaturated soil seepage flow, distortion and strength problem in the problems such as the calculating of the geological hazards such as the slope instability brought out as the prediction of shallow surface pollutant migration rate and scope and processing problem thereof, rainfall, rubble flow, retaining structure soil lateral pressure and stability analysis, all need to obtain the native water characteristic curve of unsaturated soil, could carry out rationally effectively analyzing to these major issues.Therefore.Unsaturated soil soil water characteristic curve fixes in practical engineering application really has the important research meaning.
At present, the method for indoor test soil water characteristic curve mainly contains volumetric pressure plate instrument, Temple instrument method, filter paper method etc.But the soil characteristics curve difference that above-mentioned method of testing tests out the soil body in different condition is larger, external condition is larger on the result impact of test, the unstable and out of true of test result, and test process is consuming time longer, and efficiency is low, and workload is large.
the utility model content:
The purpose of this utility model is in order to provide a kind of easy to operate, workload is little, testing efficiency is high, can effectively solve that existing instrument test difficulty is large, the native water characteristic curve tester that is suitable for the particle diameter special coarse-grained soils less than normal such as sand class, gravel class, rubble class of the unstable coarse problem of test result.
The purpose of this utility model is achieved like this:
The utility model is suitable for the native water characteristic curve tester of special coarse-grained soil, comprise pedestal, bottom is provided with the organic glass cylinder of permeable stone, the organic glass bottom of cylinder has freeing port, freeing port is connected with water storage unit by drainpipe, the top cover with water inlet is equipped with at organic glass cylinder top, the first aqueduct that the organic glass cylinder communicates by the water inlet with on top cover is connected with the first water storage container, at the soil sample top that is positioned at the organic glass cylinder, the porous disc that upper water can evenly be infiltrated is arranged, at organic glass cylinder side wall and the fair height of top porous disc, opening is arranged, opening is connected with the second water storage container by the second aqueduct, the moisture transducer in real time tested soil sample internal moisture detected and the pore water pressure sensor in real time tested soil sample internal void water pressure detected are housed in the organic glass cylinder.
Above-mentioned moisture transducer and pore water pressure sensor respectively with can carry out analyzing and processing and correspondingly show that the data acquisition system (DAS) of tested soil sample internal volume water cut and pore water pressure is connected detection signal.
The 3rd by-pass valve control is arranged on above-mentioned drainpipe.
The first by-pass valve control that adjust flux is arranged on the first above-mentioned aqueduct.
On the second above-mentioned aqueduct, the second by-pass valve control is arranged.
Above-mentioned organic glass cylinder access water content sensor and the tapping of pore water pressure sensor have respectively ring seal, prevent that the organic glass cylinder side wall from leaking.
The utility model step when concrete the measurement is as follows:
1. at first tested soil sample is recorded to its saturation permeability coefficient according to " earthwork test rule ", " geotechnological experimental technique standard ".
2. permeable stone is arranged on to the organic glass bottom of cylinder, in organic glass cylinder of again layering of tested special coarse-grained soil soil sample being packed into, make soil sample reach preset height, insert subsequently moisture transducer and pore water pressure sensor in tested soil sample, moisture transducer, pore water pressure sensor and data acquisition system (DAS) are connected simultaneously.Finally at the sample top, install porous disc and top cover.
3. open second, third by-pass valve control, according to the saturation permeability coefficient of soil sample measured before experiment, regulate the first by-pass valve control, control flow of inlet water.Because moisture transducer, pore water pressure sensor and data acquisition system (DAS) can regularly be tested the volumetric water content of the inner any point of tested soil sample and the variation of pore water pressure, finally can obtain volumetric water content θ according to the data that record
ω iwith pore water pressure u
wi.
4. calculate corresponding matric suction: u
a-u
wi, u wherein
aatmospheric pressure under the condition of test location, obtain net result, finally take matric suction as horizontal ordinate, and volumetric water content is ordinate, draws the native water characteristic curve of tested soil sample.
The utility model is suitable for the native water characteristic curve tester of special coarse-grained soil, and following advantage is arranged:
1. simple and reasonable, easy to make, simple to operate.
2. by moisture transducer and pore water pressure sensor, volumetric water content and pore water pressure in tested special coarse-grained soil are detected in real time, detection signal is sent to acquisition system simultaneously, obtain real-time volumetric water content and pore water pressure force data, improve stability and the precision of test, reduce the manual record workload simultaneously.
3. at the soil sample top, porous disc is set, can makes upper water ooze under evenly, improve test accurately.
4. in test process, can regulate the first by-pass valve control according to the special coarse-grained soil soil sample saturation permeability coefficient that before experiment, test obtains in advance, control the flow of water inlet, making and infiltrating border is the flow border, when ponding is arranged at the soil sample top, unnecessary ponding can be discharged by the opening of top sidewall, thereby realizes the conversion of border and head boundary.
5. in test process, soil sample is different along short transverse water percentage possibility, and the native water characteristic curve of same soil sample under same external condition is certain, along short transverse, a plurality of measuring points are set in soil sample, can obtain the data under a plurality of different water cut conditions simultaneously, thereby raise the efficiency and precision.
the accompanying drawing explanation:
Fig. 1 is structural representation of the present utility model.
The structural representation that Fig. 2 is the utility model porous disc.
embodiment:
Referring to Fig. 1, Fig. 2, the present embodiment is suitable for the native water characteristic curve tester of special coarse-grained soil, comprises that pedestal 12, bottom are provided with the cylindrical organic glass cylinder 14 of permeable stone 7.Organic glass cylinder 14 bottoms are provided with freeing port.Freeing port is connected with water storage unit 8 by drainpipe 10.Organic glass cylinder 14 tops are equipped with the top cover 17 of water inlet and by the first aqueduct 18 and are connected with the first water storage container 1.At the soil sample top that is positioned at the organic glass cylinder, porous disc 16 is set, upper water can evenly be infiltrated.On organic glass cylinder 14 sidewalls and top porous disc 16, the fair height in plane arranges an opening, opening is connected with the second water storage container 3 by the second aqueduct 4, can in time the unnecessary ponding on soil sample surface be got rid of, realize the conversion of flow border and head boundary.The moisture transducer 15 in real time tested soil sample internal moisture detected and the pore water pressure sensor 9 in real time tested soil sample internal void water pressure detected are housed in organic glass cylinder 14.Moisture transducer 15 is connected with data acquisition system (DAS) 6 respectively with pore water pressure sensor 9.Data acquisition system (DAS) 6 can be carried out analyzing and processing corresponding tested soil sample internal volume water cut and the pore water pressure of drawing to detection signal.Be provided with the 3rd by-pass valve control 11 on drainpipe 10.Be provided with the first by-pass valve control 2 of adjust flux on top cover the first aqueduct, can be according to experiment needs, the size of adjust flux.Be provided with the second by-pass valve control 5 on the second aqueduct 4.Tapping at access water content sensor 15 and pore water pressure sensor 9 also is provided with ring seal 13, can make 14 sealings of organic glass cylinder, prevents that sidewall from leaking.
Claims (6)
1. be suitable for the native water characteristic curve tester of special coarse-grained soil, it is characterized in that comprising pedestal, the organic glass cylinder of permeable stone is arranged at bottom, the organic glass bottom of cylinder has freeing port, freeing port is connected with water storage unit by drainpipe, the top cover with water inlet is equipped with at organic glass cylinder top, the first aqueduct that the organic glass cylinder communicates by the water inlet with on top cover is connected with the first water storage container, at the soil sample top that is positioned at the organic glass cylinder, the porous disc that upper water can evenly be infiltrated is arranged, at organic glass cylinder side wall and the fair height of top porous disc, opening is arranged, opening is connected with the second water storage container by the second aqueduct, the moisture transducer in real time tested soil sample internal moisture detected and the pore water pressure sensor in real time tested soil sample internal void water pressure detected are housed in the organic glass cylinder.
2. the native water characteristic curve tester that is suitable for special coarse-grained soil according to claim 1, is characterized in that moisture transducer and pore water pressure sensor and can carry out analyzing and processing and correspondingly show that the data acquisition system (DAS) of tested soil sample internal volume water cut and pore water pressure is connected detection signal.
3. the native water characteristic curve tester that is suitable for special coarse-grained soil according to claim 1 and 2, is characterized in that on drainpipe having the 3rd by-pass valve control.
4. the native water characteristic curve tester that is suitable for special coarse-grained soil according to claim 1 and 2, is characterized in that on the first aqueduct having the first by-pass valve control of adjust flux.
5. the native water characteristic curve tester that is suitable for special coarse-grained soil according to claim 1 and 2, its feature has the second by-pass valve control on the second aqueduct.
6. the native water characteristic curve tester that is suitable for special coarse-grained soil according to claim 1 and 2, is characterized in that the tapping of organic glass cylinder access water content sensor and pore water pressure sensor has respectively ring seal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320493752 CN203365432U (en) | 2013-08-14 | 2013-08-14 | Soil-water characteristic curve testing instrument applicable to special coarse-grained soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320493752 CN203365432U (en) | 2013-08-14 | 2013-08-14 | Soil-water characteristic curve testing instrument applicable to special coarse-grained soil |
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| Publication Number | Publication Date |
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| CN203365432U true CN203365432U (en) | 2013-12-25 |
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| CN 201320493752 Expired - Fee Related CN203365432U (en) | 2013-08-14 | 2013-08-14 | Soil-water characteristic curve testing instrument applicable to special coarse-grained soil |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106324045A (en) * | 2016-11-01 | 2017-01-11 | 西安理工大学 | Device for testing electric conductivity and soil-water characteristics of loess |
| CN108508044A (en) * | 2018-03-16 | 2018-09-07 | 西南交通大学 | Soil characteristics curve measurement mechanism and method under a kind of drying and watering cycle |
| CN109459368A (en) * | 2018-11-23 | 2019-03-12 | 成都理工大学 | A kind of permeameter for realizing multi- scenarios method and drying and watering cycle in situ |
| CN110487681A (en) * | 2019-09-05 | 2019-11-22 | 西藏农牧学院 | Rainfall infiltration experimental rig and its test method in a kind of multifunctional room |
-
2013
- 2013-08-14 CN CN 201320493752 patent/CN203365432U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106324045A (en) * | 2016-11-01 | 2017-01-11 | 西安理工大学 | Device for testing electric conductivity and soil-water characteristics of loess |
| CN108508044A (en) * | 2018-03-16 | 2018-09-07 | 西南交通大学 | Soil characteristics curve measurement mechanism and method under a kind of drying and watering cycle |
| CN109459368A (en) * | 2018-11-23 | 2019-03-12 | 成都理工大学 | A kind of permeameter for realizing multi- scenarios method and drying and watering cycle in situ |
| CN109459368B (en) * | 2018-11-23 | 2023-12-29 | 成都理工大学 | Osmotic instrument for realizing multi-field coupling and in-situ dry-wet circulation |
| CN110487681A (en) * | 2019-09-05 | 2019-11-22 | 西藏农牧学院 | Rainfall infiltration experimental rig and its test method in a kind of multifunctional room |
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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: 20131225 Termination date: 20160814 |