CN203216821U - Testing device for soil air-infiltration coefficients - Google Patents

Testing device for soil air-infiltration coefficients Download PDF

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Publication number
CN203216821U
CN203216821U CN 201320235944 CN201320235944U CN203216821U CN 203216821 U CN203216821 U CN 203216821U CN 201320235944 CN201320235944 CN 201320235944 CN 201320235944 U CN201320235944 U CN 201320235944U CN 203216821 U CN203216821 U CN 203216821U
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CN
China
Prior art keywords
soil
pressure
air
testing
gas
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CN 201320235944
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Chinese (zh)
Inventor
方祥位
汪龙
申春妮
李春海
姚志华
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方祥位
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Priority to CN 201320235944 priority Critical patent/CN203216821U/en
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Publication of CN203216821U publication Critical patent/CN203216821U/en

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Abstract

The utility model discloses a testing device for soil air-infiltration coefficients. The testing device comprises a loading system, a sample system and a testing system. The sample system comprises a soil-engineering three-shaft testing device. A three-shaft base, a confining-pressure device, an air intake pipe and an air exhaust pipe are arranged on the soil-engineering three-shaft testing device. The three-shaft base is used for placement of soil samples, the confining-pressure device is used for applying confining pressure to the soil samples, the air intake pipe is used for allowing air to enter the soil samples, and the air exhaust pipe is used for exhausting the air infiltrating the soil samples and is communicated with the atmosphere. The loading system comprises a confining-pressure controller and an air-pressure controller. The confining-pressure controller is used for controlling output confining-pressure magnitude of the soil-engineering three-shaft testing device, and the air-pressure controller is used for controlling air pressure of the air, entering the soil samples, in the air intake pipe. The testing system comprises a double-range flowmeter arranged on the air exhaust pipe. The testing device can accurately control the air pressure and air flow in the soil samples, can accurately measure flow of the air infiltrating the soil samples, and can meet testing requirements on the air-infiltration coefficients of soil with low air infiltration.

Description

Soil permeation coefficient testing device

Technical field

The utility model belongs to the soil permeability technical field of measurement and test, is specifically related to a kind of low permeation soil permeation coefficient (permeation coefficient=10 that can be used for testing -7~ 10 -12M/s) proving installation.

Background technology

Perviousness refers to the ability of native conductive liquid or gas, often measures with infiltration coefficient.At present, the laboratory is as follows for the method for testing of soil permeation coefficient: be after three samples are installed on the geotechnological triaxial test device with soil processing, three samples to this soil apply confined pressure and feed gas, behind the steady air current of three samples of infiltrate, utilization is installed in the aquifer yield of the water tank on the gas outlet, the volume of the air that flows through three samples that replaces, and then calculate the permeation coefficient of soil sample.

Though this soil permeation coefficient testing method can satisfy the test request of soil permeation coefficient to a certain extent, but because in test process, the flow of employing liquid converts and obtains the flow of gas, cause existing that measuring accuracy is poor, operation steps is complicated and defective such as length consuming time, and only can satisfy permeation coefficient higher (≤10 -5M/s) soil is when lower (permeation coefficient=10 of permeation coefficient of soil -7~ 10 -12M/s) time, as bentonitic clay and cohesive soil, existing method of testing can't satisfy test request.

Summary of the invention

In view of this, the purpose of this utility model is to provide a kind of soil permeation coefficient testing device, and this soil permeation coefficient testing device can satisfy the testing requirement of the permeation coefficient of low permeation soil.

For achieving the above object, the utility model provides following technical scheme:

A kind of soil permeation coefficient testing device comprises loading system, sample system and test macro;

Described sample system comprises geotechnological triaxial test device, and described geotechnological triaxial test device is provided with for three bases placing soil pattern, for the confining pressure device that soil pattern is applied confined pressure, for the draft tube of feeding gas in soil pattern and the gas outlet that flows out and communicate with atmosphere for the gas behind the infiltrate soil pattern;

Described loading system comprises the gas pressure regulator for the gas atmosphere in the confined pressure controller of accurately controlling described geotechnological triaxial test device output confined pressure size and the described draft tube feeding soil pattern;

Described test macro comprises the double-range flowmeter that is arranged on the described gas outlet.

Further, described confining pressure device is provided be used to the confined pressure force pipe that confined pressure is provided, described confined pressure force pipe is provided with for air pressure being converted to the gas-liquid pressure conversion equipment of described confining pressure device output hydraulic pressure, and described confined pressure controller is arranged on the described confined pressure force pipe.

Further, also comprise the flowmeter display that links to each other with described double-range flowmeter.

Further, also be provided with for the permeable stone that is placed on the soil pattern upper and lower end face at test process in the described geotechnological triaxial test device.

Further, described geotechnological triaxial test device is provided with in test process the sample cap that is used for being placed on above the soil pattern, the air intake opening of described draft tube is arranged in the described sample cap, and the exhausr port of described gas outlet is arranged on three bases that are positioned at the soil pattern below.

The beneficial effects of the utility model are:

Soil permeation coefficient testing device of the present utility model, by adopting geotechnological triaxial test device, utilize confining pressure device to apply confined pressure for soil pattern, after being changed into hydraulic pressure, air pressure applies confined pressure to soil pattern, and under the effect of confined pressure controller, can guarantee confined pressure steady, and guarantee all the time that in test process confined pressure is higher than air pressure 10-20kPa, can prevent effectively that gas oozes out in test process between soil pattern and latex film cover, guarantee that gas all flows through from soil pattern; By in draft tube gas pressure regulator being set, can accurately control the gaseous tension and the flow that feed in the soil pattern, by the double-range flowmeter is set at gas outlet, can accurately measure the gas flow behind the infiltrate soil pattern, therefore, the measuring accuracy height of soil permeation coefficient testing device of the present utility model, simple to operate not only can be tested the permeation coefficient of higher permeation soil, and can satisfy the test request of the permeation coefficient of low permeation soil.

Description of drawings

In order to make the purpose of this utility model, technical scheme and beneficial effect clearer, the utility model provides following accompanying drawing to describe:

Fig. 1 is the structural representation of the utility model soil permeation coefficient testing device embodiment.

Embodiment

Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described in detail.

As shown in Figure 1, be the structural representation of the utility model soil permeation coefficient testing device embodiment.The soil permeation coefficient testing device of present embodiment comprises loading system, sample system and test macro.

Sample system comprises geotechnological triaxial test device 1, and geotechnological triaxial test device 1 is provided with for three bases placing soil pattern 2, for the confining pressure device that soil pattern 2 is applied confined pressure, for the gas outflow after feeding the draft tube 3 of gases and be used for the infiltrate soil pattern in soil pattern 2 and the gas outlet 4 that communicates with atmosphere.

Loading system comprises for the confined pressure controller 5 of accurately controlling geotechnological triaxial test device 1 output confined pressure size and is used for the gas pressure regulator 6 that control draft tube 3 feeds the gas atmosphere in the soil pattern.The confining pressure device of present embodiment is provided be used to the confined pressure force pipe 7 that confined pressure is provided, confined pressure force pipe 7 is provided with for air pressure being converted to the gas-liquid pressure conversion equipment of confining pressure device output hydraulic pressure, confined pressure controller 5 is arranged on the described confined pressure force pipe 7 and for the pressure in the control confined pressure force pipe 7, the confined pressure controller 5 of present embodiment is arranged between gas-liquid pressure conversion equipment and the confining pressure device.After converting air pressure to hydraulic pressure, output to confined pressure force pipe 7 back and be connected with the triaxial cell of the confining pressure device that is full of distilled water, can be with uniform and stable being applied to around the soil pattern of pressure; The geotechnological triaxial test device 1 that is present embodiment adopts hydraulic pressure to apply confined pressure, in test process, remain pressure in the confined pressure force pipe 7 and be higher than air pressure 10-20kPa in the draft tube 3, be that confined pressure is higher than the air pressure that feeds gas, can prevent effectively that the gas that feeds in the soil pattern 2 from oozing out from the side of soil pattern 2.Draft tube 3 and the confined pressure force pipe 7 of present embodiment all provide pressure by inlet manifold 11.

Test macro comprises the double-range flowmeter 8 that is arranged on the gas outlet 4, by double-range flowmeter 8 is set, can accurately measure the gas flow that oozes out behind the soil pattern 2.The soil permeation coefficient testing device of preferred present embodiment also comprises the flowmeter display 9 that links to each other with double-range flowmeter 8, is used for showing the measured value of double-range flowmeter 8, is convenient to pin-point reading, can record flow and the time of gas simultaneously.

The soil permeation coefficient testing device of present embodiment, by adopting geotechnological triaxial test device 1, utilize confining pressure device to apply confined pressure for soil pattern, under the effect of confined pressure controller 5, can guarantee confined pressure steady, prevent that gas guarantees that from circulation between soil pattern and the latex film cover gas all flows through from soil pattern in test process; By in draft tube 3 gas pressure regulator 6 being set, can accurately control the gaseous tension and the flow that feed in the soil pattern, by at gas outlet 4 double-range flowmeter 8 being set, can accurately measure the gas flow behind the infiltrate soil pattern, therefore, the measuring accuracy of the soil permeation coefficient testing device of present embodiment is higher, not only can test the permeation coefficient of higher permeation soil, and can satisfy permeation coefficient (permeation coefficient=10 of low permeation soil -7~ 10 -12M/s) test request.

Concrete, in test process, also be provided with for the permeable stone 10 that is placed at test process on soil pattern 2 upper and lower end faces in the geotechnological triaxial test device 1 of present embodiment, geotechnique's triaxial test device 1 is provided with the sample cap that is used for being placed on above the soil pattern in test process, the air intake opening of draft tube 3 is arranged in the sample cap, the exhausr port of gas outlet 4 is arranged on three bases that are positioned at the soil pattern below, can further improve measuring accuracy.

Below the concrete grammar step that adopts present embodiment soil permeation coefficient testing device to measure soil pattern permeation coefficient is described.

1) soil pattern 2 is prepared as three samples that are applicable to geotechnological triaxial test device 1, and is installed on three bases, and place permeable stone 10 in the both ends of the surface up and down of soil pattern 2;

2) apply confined pressure, by the size of confined pressure controller 5 control confining pressure device output confined pressures;

3) in soil pattern 2, feed gases, feed gas atmosphere and flow in the soil patterns 2 by gas pressure regulator 6 controls, and in test process, remain pressure in the confined pressure force pipe 7 and be higher than air pressure 10-20kPa in the draft tube 3;

4) treat that gas flows in the gas outlet 4 are stable after, read the flow value that 8 tests of double-range flowmeter obtain;

5) calculate soil permeation coefficient.

Explanation is at last, above preferred embodiment is only unrestricted in order to the technical solution of the utility model to be described, although the utility model is described in detail by above preferred embodiment, but those skilled in the art are to be understood that, can make various changes to it in the form and details, and not depart from the utility model claims institute restricted portion.

Claims (5)

1. a soil permeation coefficient testing device comprises loading system, sample system and test macro, it is characterized in that:
Described sample system comprises geotechnological triaxial test device, and described geotechnological triaxial test device is provided with for three bases placing soil pattern, for the confining pressure device that soil pattern is applied confined pressure, for the draft tube of feeding gas in soil pattern and the gas outlet that flows out and communicate with atmosphere for the gas behind the infiltrate soil pattern;
Described loading system comprises for the confined pressure controller of accurately controlling described geotechnological triaxial test device output confined pressure size and is used for the gas pressure regulator that the described draft tube of control feeds the gas atmosphere in the soil pattern;
Described test macro comprises the double-range flowmeter that is arranged on the described gas outlet.
2. soil permeation coefficient testing device according to claim 1, it is characterized in that: described confining pressure device is provided be used to the confined pressure force pipe that confined pressure is provided, described confined pressure force pipe is provided with for air pressure being converted to the gas-liquid pressure conversion equipment of described confining pressure device output hydraulic pressure, and described confined pressure controller is arranged on the described confined pressure force pipe.
3. soil permeation coefficient testing device according to claim 1 is characterized in that: also comprise the flowmeter display that links to each other with described double-range flowmeter.
4. according to each described soil permeation coefficient testing device of claim 1-3, it is characterized in that: also be provided with for the permeable stone that is placed on the soil pattern upper and lower end face at test process in the described geotechnological triaxial test device.
5. soil permeation coefficient testing device according to claim 4, it is characterized in that: described geotechnological triaxial test device is provided with in test process the sample cap that is used for being placed on above the soil pattern, the air intake opening of described draft tube is arranged in the described sample cap, and the exhausr port of described gas outlet is arranged on three bases that are positioned at the soil pattern below.
CN 201320235944 2013-05-05 2013-05-05 Testing device for soil air-infiltration coefficients CN203216821U (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
CN 201320235944 CN203216821U (en) 2013-05-05 2013-05-05 Testing device for soil air-infiltration coefficients

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103913407A (en) * 2013-12-26 2014-07-09 中国人民解放军63653部队 Soil triaxial apparatus-based unsaturated soil gas-permeability measuring method
CN104049073A (en) * 2014-06-18 2014-09-17 中国科学院武汉岩土力学研究所 Compacted clay impervious structure cracking failure simulation test system under environmental gradient action
CN106092853A (en) * 2016-06-07 2016-11-09 长安大学 A kind of soil mass water air humidity falls into consolidation infiltration simultaneous determination instrument
CN106290077A (en) * 2016-11-04 2017-01-04 西南交通大学 The full water stratum face soil body is in three-dimensional stress lower critical infiltration pressure testing device and test method
CN109470619A (en) * 2018-12-07 2019-03-15 湖南大学 A kind of the saturation permeability coefficient test macro and method of analog Rock And Soil drying and watering cycle effect

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103913407A (en) * 2013-12-26 2014-07-09 中国人民解放军63653部队 Soil triaxial apparatus-based unsaturated soil gas-permeability measuring method
CN103913407B (en) * 2013-12-26 2017-01-04 中国人民解放军63653部队 A kind of unsaturated soil gas permeability measuring method based on soil triaxial apparatus
CN104049073A (en) * 2014-06-18 2014-09-17 中国科学院武汉岩土力学研究所 Compacted clay impervious structure cracking failure simulation test system under environmental gradient action
CN104049073B (en) * 2014-06-18 2015-10-28 中国科学院武汉岩土力学研究所 Compacted cohesive soil leakage preventing structure Cracking Failure simulation experiment system under a kind of environmental gradient effect
CN106092853A (en) * 2016-06-07 2016-11-09 长安大学 A kind of soil mass water air humidity falls into consolidation infiltration simultaneous determination instrument
CN106092853B (en) * 2016-06-07 2018-07-20 长安大学 A kind of sunken consolidation infiltration simultaneous determination instrument of soil mass water-air humidity
CN106290077A (en) * 2016-11-04 2017-01-04 西南交通大学 The full water stratum face soil body is in three-dimensional stress lower critical infiltration pressure testing device and test method
CN106290077B (en) * 2016-11-04 2019-11-29 西南交通大学 The full water stratum face soil body permeates pressure testing device and test method in three-dimensional stress lower critical
CN109470619A (en) * 2018-12-07 2019-03-15 湖南大学 A kind of the saturation permeability coefficient test macro and method of analog Rock And Soil drying and watering cycle effect

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130925

Termination date: 20140505

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