CN102749276B - Device and method for determining permeation coefficient of unsaturated soil - Google Patents

Device and method for determining permeation coefficient of unsaturated soil Download PDF

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Publication number
CN102749276B
CN102749276B CN201210196089.4A CN201210196089A CN102749276B CN 102749276 B CN102749276 B CN 102749276B CN 201210196089 A CN201210196089 A CN 201210196089A CN 102749276 B CN102749276 B CN 102749276B
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soil
stainless steel
sample
filter
steel trough
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CN102749276A (en
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谈云志
王世梅
童富果
陈勇
李小伟
邹良超
胡新疆
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Yichang Hongqian environmental protection building materials Co., Ltd
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China Three Gorges University CTGU
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Abstract

The invention provides a device for determining the permeation coefficient of unsaturated soil. The device is characterized in that the upper end of a stainless steel tank is provided with an upper reverse filter apparatus, and the lower end of the stainless steel tank is provided with a lower reverse filter apparatus; the longer surface of the stainless steel tank is provided with an open end surface, and the open end surface is provided with toughened glass for closing the open end surface; and a plurality of soil water sensors and soil tension meters are respectively arranged on at least one end surface of the stainless steel tank from top to bottom. Compared with present devices and the prior art, the device and a method for determining the permeation coefficient of the unsaturated soil provided by the invention have the following beneficial effects: the permeation coefficient of the unsaturated soil can be directly obtained through simple one-dimensional infiltration tests and through utilizing an iterative method, the device is simple to manufacture, the measure precision is high, the unsaturated permeation coefficient of a sample can be measured, and the soil-water characteristic curve of the sample can also be measured.

Description

A kind of device and method of measuring unsaturated soil infiltration coefficient
Technical field
The present invention relates to unsaturated soil in civil engineering work and measure field, particularly a kind of device and method of measuring unsaturated soil infiltration coefficient.
Background technology
The infiltration coefficient of unsaturated soil is to analyze rainfall on slope stability, solid wastes landfill site, the migration of underground sewage and the important parameter of fill construction problem.But owing to there being the existence of matric suction in unsaturated soil, can not determine its infiltration coefficient by conventional saturation test method, what make unsaturated soil infiltration coefficient definitely has a larger difficulty.Unsaturated soil infiltration coefficient can be fixed by direct or indirect method side.Directly measure, both can, in testing laboratory, also can carry out at the scene, but measuring process needs are for a long time, very high to the accuracy requirement of instrument, directly measure quite difficult with existing means of testing; Indirect method will be used native volume-quality character, soil-water characteristic curve and native saturation permeability coefficient, predict unsaturated soil infiltration coefficient by empirical model again, based on this, numerous scholars have proposed various forms of infiltration coefficient models, but different empirical models predicts that the soil body osmotic coefficient difference obtaining under the same terms is very large, also there is no so far a kind of unified unsaturation infiltration coefficient function.Therefore, no matter directly or indirectly method, does not all also have a kind of method of acquisition unsaturated soil infiltration coefficient of simple possible.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of device and method of measuring unsaturated soil infiltration coefficient, can infiltrate to test by one dimension with easier device to obtain unsaturated soil infiltration coefficient.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of device of measuring unsaturated soil infiltration coefficient, and stainless steel trough body upper end is provided with anti-filter device, and lower end is provided with lower anti-filter device;
The longer face of stainless steel trough body is provided with an open end face, and this opening end face is provided with for by tempered glass airtight this opening end face;
On at least one end face of stainless steel trough body, be respectively equipped with from top to bottom multiple soil moisture sensors and Soil Tension.
In described upper anti-filter device, the vessel upper surface of catchmenting is provided with water inlet, and the vessel below of catchmenting is provided with loaded filter, and upper loaded filter below is provided with woven wire;
In described lower anti-filter device, lower woven wire below is provided with lower loaded filter, and lower loaded filter below is provided with aluminium sheet, and aluminium sheet is provided with lower discharging tube.
Described upper anti-filter device is connected with water system by upper water inlet;
Described lower anti-filter device is connected with effluent collection device by lower discharging tube.
In described effluent collection device, gas-liquid separator upper end is connected with lower discharging tube, and gas-liquid separator lower end is connected with bend pipe by one section of horizontal tube, is connected with buret above horizontal tube.
Described stainless steel trough body xsect is square.
The height of the described longer face of stainless steel trough body is 80-120cm.
The both sides of the open end face of described stainless steel trough body are provided with chute, and tempered glass is arranged in chute, and fastening by the multiple fastening bolts on chute;
Between described tempered glass and stainless steel trough body, be also provided with O-ring seal.
Above-mentioned device is measured a method for unsaturated soil infiltration coefficient, comprises the following steps:
One, manufacture sample;
Two, on sample, bury soil moisture sensor and Soil Tension underground;
Three, connect water system and effluent collection device;
Four, open computing machine, open data acquisition system (DAS);
Allow water enter sample, start to infiltrate;
Water cut and matric suction that soil moisture sensor and Soil Tension record the position soil body by data acquisition system (DAS) are worth over time;
When water infiltration arrives behind sample bottom, utilize effluent collection device Timing measurement aquifer yield;
Observe the data that acquisition system collects, after the reading of the each sensor in differing heights place approaches unanimously, show that sample reaches capacity, and gets final product termination test;
The data of collection and the saturation permeability coefficient that records are in advance carried out to iterative computation, obtain the unsaturation infiltration coefficient of respective samples.
In step 1, stainless steel trough body level to be put on the ground, open end faces up, and according to testing requirements, upper anti-filter device and lower anti-filter device is fixed in position;
Pack test material into stainless steel trough body, in the condition lower leaf compacting of controlling density, tempered glass is inserted to chute, realize sealing by fastening bolt.
In step 2, at the reserving hole place of stainless steel trough body, use the fetch earth groove identical with Soil Tension size with soil moisture sensor to cut the earth, then bury soil moisture sensor and Soil Tension underground.
A kind of device and method of measuring unsaturated soil infiltration coefficient provided by the invention, compared with prior art, beneficial effect is: can by simple one dimension infiltrate test and iterative computation directly obtain unsaturated soil infiltration coefficient, and instrument manufacturing is simple, measuring accuracy is high, both can measure the unsaturation infiltration coefficient of sample, also can be for measuring the soil-water characteristic curve of sample.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is one-piece construction schematic diagram of the present invention.
Fig. 2 is the A-A cross-sectional schematic of Fig. 1.
In figure: upper water inlet 1, the vessel 2 that catchment, upper loaded filter 3, upper woven wire 4, stainless steel trough body 5, soil moisture sensor 6, Soil Tension 7, lower woven wire 8, lower loaded filter 9, aluminium sheet 10, base 11, lower discharging tube 12, effluent collection device 13, gas-liquid separator 14, bend pipe 15, buret 16, water system 17, tempered glass 18, O-ring seal 19, fastening bolt 20, chute 21, upper anti-filter device 22, lower anti-filter device 23, gas outlet 24, sample 25.
Embodiment
In Fig. 1, a kind of device of measuring unsaturated soil infiltration coefficient, stainless steel trough body 5 upper ends are provided with anti-filter device 22, and lower end is provided with lower anti-filter device 23;
The longer face of stainless steel trough body 5 is provided with an open end face, and this opening end face is provided with for by tempered glass airtight this opening end face 18;
In the scheme of optimizing, the both sides of the open end face of described stainless steel trough body 5 are provided with chute 21, and tempered glass 18 is arranged in chute 21, and fastening by the multiple fastening bolts 20 on chute 21;
Between described tempered glass 18 and stainless steel trough body 5, be also provided with O-ring seal 19.Adopt the fixed form of this structure to be beneficial to the installation of tempered glass 18, the mounting means that certainly adopts other is also feasible, the mode that for example adopts multiple clamps that tempered glass 18 and stainless steel trough body 5 are clamped.
On at least one end face of stainless steel trough body 5, be respectively equipped with from top to bottom multiple soil moisture sensors 6 and Soil Tension 7.In Fig. 1, in this example, the both sides that soil moisture sensor 6 and Soil Tension 7 are arranged on respectively to the open end face of stainless steel trough body 5, multiple soil moisture sensors 6 and Soil Tension 7 are arranged from top to bottom, thereby measure the data of sample 25 different elevations.
In described upper anti-filter device 22, vessel 2 upper surfaces of catchmenting are provided with water inlet 1, and vessel 2 belows of catchmenting are provided with loaded filter 3, and upper loaded filter 3 belows are provided with woven wire 4;
In described lower anti-filter device 23, lower woven wire 8 belows are provided with lower loaded filter 9, and lower loaded filter 9 belows are provided with aluminium sheet 10, and aluminium sheet 10 is provided with lower discharging tube 12.In this example, the upper surface of aluminium sheet 10 has the shape of similar funnel, is beneficial to water to concentrate and discharge from lower discharging tube 12.
Described upper anti-filter device 22 is connected with water system 17 by upper water inlet 1;
Described lower anti-filter device 23 is connected with effluent collection device 13 by lower discharging tube 12.
In described effluent collection device 13, gas-liquid separator 14 upper ends are connected with lower discharging tube 12, and gas-liquid separator 14 lower ends are connected with bend pipe 15 by one section of horizontal tube, are connected with buret 16 above horizontal tube.Upper end at gas-liquid separator 14 is also provided with gas outlet 24, for isolated gas is discharged.
Between lower discharging tube 12 and gas-liquid separator 14, between buret 16 and horizontal tube and be also provided with valve on gas outlet 24.
Described stainless steel trough body 5 xsects are square.The height of described stainless steel trough body 5 longer faces is 80-120cm.Adopting is in this example highly 100cm, and test unit size of the present invention is large, more representative as the soil sample of sample 25, and adopting xsect is that square design can realize sample preparation under horizontality, has improved the homogeneity of sample 25.
Above-mentioned device is measured a method for unsaturated soil infiltration coefficient, comprises the following steps:
One, make sample 25;
In step 1, stainless steel trough body 5 levels to be put on the ground, open end faces up, and according to testing requirements, upper anti-filter device 22 and lower anti-filter device 23 is fixed in position;
Pack test material into stainless steel trough body 5, in the condition lower leaf compacting of controlling density, tempered glass 18 is inserted to chute 21, realize sealing by fastening bolt 20.
Two, on sample 25, bury soil moisture sensor 6 and Soil Tension 7 underground;
At the reserving hole place of stainless steel trough body 5, use the fetch earth groove identical with Soil Tension 7 sizes with soil moisture sensor 6 to cut the earth, then bury soil moisture sensor 6 and Soil Tension 7 underground.
Three, connect water system 17 and effluent collection device 13;
Wherein, upper water inlet 1 is connected with water system 17, and lower discharging tube 12 is connected with gas-liquid separator 14 with effluent collection device 13.
Four, open computing machine, open data acquisition system (DAS);
Open the valve in water system 17, allow water enter sample 25, start to infiltrate;
Water cut and matric suction that soil moisture sensor 6 and Soil Tension 7 record the position soil body by data acquisition system (DAS) are worth over time;
When water infiltration arrives behind sample 25 bottoms, utilize effluent collection device 13 Timing measurement aquifer yields;
Observe the data that acquisition system collects, after the reading of the each sensor in differing heights place approaches unanimously, show that sample 25 has reached capacity, and gets final product termination test; Finish after test storage data.
The data of collection and the saturation permeability coefficient that records are in advance carried out to iterative computation, obtain the unsaturation infiltration coefficient of respective samples 25.This computation process is carried out by existing computer program, when utilization, only need be inputted water percentage, matric suction and the saturation permeability coefficient of test actual measurement, can obtain unsaturation infiltration coefficient.

Claims (3)

1. measure a method for unsaturated soil infiltration coefficient, comprise the device of measuring unsaturated soil infiltration coefficient, stainless steel trough body (5) upper end is provided with anti-filter device (22), and lower end is provided with lower anti-filter device (23);
The longer face of stainless steel trough body (5) is provided with an open end face, and this opening end face is provided with for by tempered glass airtight this opening end face (18);
On at least one end face of stainless steel trough body (5), be respectively equipped with from top to bottom multiple soil moisture sensors (6) and Soil Tension (7), it is characterized in that comprising the following steps:
One, manufacture sample (25);
Two, on sample (25), bury soil moisture sensor (6) and Soil Tension (7) underground;
Three, connect water system (17) and effluent collection device (13);
Four, open computing machine, open data acquisition system (DAS);
Allow water enter sample (25), start to infiltrate;
Water cut and matric suction that soil moisture sensor (6) and Soil Tension (7) record the position soil body by data acquisition system (DAS) are worth over time;
When water infiltration arrives behind sample (25) bottom, utilize effluent collection device (13) Timing measurement aquifer yield;
Observe the data that acquisition system collects, after the reading of the each sensor in differing heights place approaches unanimously, show that sample (25) reaches capacity, and gets final product termination test;
The data of collection and the saturation permeability coefficient that records are in advance carried out to iterative computation, obtain the unsaturation infiltration coefficient of respective samples (25).
2. a kind of method of measuring unsaturated soil infiltration coefficient according to claim 1, it is characterized in that: in step 1, stainless steel trough body (5) level is put on the ground, open end faces up, and according to testing requirements, upper anti-filter device (22) and lower anti-filter device (23) is fixed in position;
Pack test material into stainless steel trough body (5), in the condition lower leaf compacting of controlling density, tempered glass (18) is inserted to chute (21), realize sealing by fastening bolt (20).
3. a kind of method of measuring unsaturated soil infiltration coefficient according to claim 1, it is characterized in that: in step 2, at the reserving hole place of stainless steel trough body (5), cut the earth with the groove that fetches earth identical with Soil Tension (7) size with soil moisture sensor (6), then bury soil moisture sensor (6) and Soil Tension (7) underground.
CN201210196089.4A 2012-06-14 2012-06-14 Device and method for determining permeation coefficient of unsaturated soil Active CN102749276B (en)

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CN103837662B (en) * 2014-01-17 2016-05-11 哈尔滨工业大学深圳研究生院 Unsaturation soil body hydraulic characteristic parameter measurement mechanism and method under increasing/dehumidification path
KR101502423B1 (en) * 2014-03-28 2015-03-13 한국지질자원연구원 Apparatus for measuring suction stress of unsaturated soil
CN104568700B (en) * 2014-12-30 2017-01-25 昆明理工大学 Adjustable soil infiltration performance detecting and loss amount sampling device
CN105136640A (en) * 2015-07-30 2015-12-09 赵龙山 Method for measuring relationship between soil infiltration wetting front and earth surface micro-topography
CN105259088A (en) * 2015-11-03 2016-01-20 三峡大学 Method and device for quickly determining permeability functions of unsaturated soil
CN105866001B (en) * 2016-04-18 2018-08-07 三峡大学 A kind of Rock And Soil osmotic coefficient investigating device and method based on water base fluorescer dilution method
CN105865746B (en) * 2016-05-29 2018-11-02 三峡大学 A kind of experimental provision and method of detection seepage flow and pressure and temp relationship
CN107255614A (en) * 2017-07-27 2017-10-17 洛阳理工学院 Remold measurement and the verification method of unsaturation silty clay infiltration coefficient
CN107589040B (en) * 2017-08-02 2019-10-08 三峡大学 It is a kind of for measuring the experimental provision and measurement method of soil aeration amount
CN111239020A (en) * 2020-02-10 2020-06-05 山东大学 Soil permeability coefficient measuring device and method capable of considering rainfall and vegetation influence

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Patentee before: CHINA THREE GORGES University

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