CN109883892A - Gas diffusivity measuring device and method in a kind of unsaturated soil - Google Patents
Gas diffusivity measuring device and method in a kind of unsaturated soil Download PDFInfo
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Abstract
The present invention relates to gas diffusivity measuring devices in a kind of unsaturated soil, including measuring system, the measuring system includes central lumen and the temperature controlled compartment positioned at central lumen periphery, the central chamber is provided with porous plate and drives the permeable stone moved up and down above porous plate and by loading device, and central lumen is separated into the Passive diffusion chamber being sequentially distributed from top to bottom, sample chamber and active diffusion chamber by the porous plate and permeable stone；The sample cavity inner sleeve is equipped with the cutting ring to accommodate soil pattern, it can be protruded into cutting ring after the permeable stone downlink, the Passive diffusion chamber is connected with inert gas inleting pipe, the active diffusion chamber is connected with search gas air inlet pipe, is in series with humidity controller and air intake valve in the inert gas inleting pipe and search gas air inlet pipe.Measuring device versatility of the present invention is high, easy to operate, the influence of comprehensive study temperature, stress and suction to gas diffusivity in unsaturated soil, and test result accuracy is high.
Description
Technical field
The present invention relates to gas diffusivity measuring devices in a kind of unsaturated soil.
Background technique
The domestic waste in China is mainly handled by land-fill method.A large amount of pollution landfill gas (such as methane and foul smell)
It is discharged into atmosphere by landfill yard soil property coating, causes serious problem of environmental pollution.Gas diffusion is landfill gas in soil property
A kind of dominant mechanism migrated in coating.Due to the shadow of weather conditions, the garbage degradation heat production of landfill and upper overburden layer etc.
It rings, diffusion of the gas in unsaturation soil property coating is by Temperature-Stress-suction collective effect.As pollution fills
The emission reduction of gas receives more and more attention, it is necessary to measure the gas diffusion of the unsaturated soil under Temperature-Stress-suction
Coefficient provides scientific basis for covering layer of landfill site engineering construction.
Has the experimental rig of measurement unsaturation soil body gas diffusivity at present, these devices have the disadvantages that (1)
Temperature, stress and the suction of unsaturation soil body sample can not be controlled simultaneously, so that can not comprehensive study temperature, stress and suction pair
The influence of gas diffusivity；(2) constancy of volume for assuming the measurement front and back unsaturation soil body, so that experimental result is by soil body body
The influence of product variation；(3) soil body suction can not be adjusted, so that it cannot continuously measuring diffusion of the identical soil sample under different suction
Coefficient.
Summary of the invention
In view of this, that the object of the present invention is to provide a kind of versatilities is high, easy to operate, test result accuracy is high is non-
Gas diffusivity measuring device in saturated soil.
The present invention is realized using following scheme: gas diffusivity measuring device in a kind of unsaturated soil, including measurement
System, the measuring system include central lumen and the temperature controlled compartment positioned at central lumen periphery, and the central chamber is provided with
Porous plate and drive the permeable stone that moves up and down above porous plate and by loading device, the porous plate and permeable stone will in
Chambers of the heart room is separated into the Passive diffusion chamber being sequentially distributed from top to bottom, sample chamber and active diffusion chamber；The sample cavity inner sleeve dress
There is the cutting ring to accommodate soil pattern, can be protruded into cutting ring after the permeable stone downlink, the Passive diffusion chamber is connected with lazy
Property gas inlet pipe, the active diffusion chamber are connected with search gas air inlet pipe, the inert gas inleting pipe and search gas
Humidity controller and air intake valve are in series in air inlet pipe.
Further, the measuring system side is provided with search gas bottle and inert gas bottle, inert gas inleting pipe
Inlet end be connected with inert gas bottle, search gas air inlet pipe is connected with search gas bottle, the search gas bottle and
The bottleneck of inert gas bottle is equipped with valve and pressure reducer.
Further, the Passive diffusion chamber and active diffusion chamber are also respectively connected exhaust pipe, by the measuring system
Side is provided with the absorption column of gas being connected with exhaust pipe outlet side, is in series with drain tap on exhaust pipe.
Further, be separately installed with fan in the Passive diffusion chamber and active diffusion chamber, Passive diffusion top of chamber and
Active diffusion chamber bottom is separately installed with hygrometer, gas concentration sensor and the capillary being in communication with the outside, in capillary
With drop.
Further, the liquid injection pipe of injection temperature control liquid in oriented temperature controlled compartment is connected at the top of the temperature controlled compartment, on liquid injection pipe
It is in series with control valve, is separately installed with temperature sensor, temperature controlled compartment inner sidewall upper portion and lower part at the top and bottom of temperature controlled compartment
Thermoregulator is not installed.
Further, the loading device uses servo hydraulic cylinder, and the telescopic rod of servo hydraulic cylinder is by Passive diffusion chamber top
Portion is connected by pressure sensor with permeable stone after penetrating, and is equipped with above Passive diffusion chamber to measure servo hydraulic cylinder
The displacement amesdial of telescopic rod displacement.
Gas diffusivity measurement method in a kind of unsaturated soil, using gas diffusivity in soil as described above
Measuring device, comprising the following steps: (1) cutting ring enchashment field unsaturated soil sample is used, by the cutting ring with unsaturated soil sample
It is placed in sample chamber；(2) it is passed through inert gas to Passive diffusion chamber, by the regulation of relative humidity of inert gas to target value,
After the mass change of pedotheque reaches and stablizes, then pedotheque reaches the corresponding suction value of relative humidity；(3) temperature control is adjusted
The temperature of room is to required temperature is tested, and loading device, which is applied by permeable stone to pedotheque, tests required stress, to soil-like
When product reach stable, pedotheque is measured by compressed height, calculates the body strain of pedotheque；(4) needed for testing
The search gas of concentration is injected into active diffusion chamber, adjusts the air pressure in active and passive diffusion chamber to atmospheric pressure, is diffused coefficient
Measurement experiment；Utilize trace gas concentration and time in active and passive diffusion chambertRelationship:, to experiment number
Straight slope is obtained according to regression analysis is carried out, calculate gas diffusivity in unsaturated soil sample,, whereinFor active diffusion chambertThe trace gas concentration at moment,For Passive diffusion chambertMoment
Trace gas concentration；Active diffusion chamber trace gas concentration when to start diffusion；It is passive when to start diffusion
Diffusion chamber trace gas concentration；For in the stress of applicationThe height of soil sample when lower soil deformation reaches stable；HBased on,
The height of Passive diffusion chamber；To apply stressThe gas porosity of pedotheque afterwards；ForFirst positive root of (n=1,2,3 ...)；U is regression constant.
Compared with prior art, the invention has the following advantages:
(1) present invention can control three temperature, stress, suction factors of unsaturated soil, and measure gas in unsaturated soil
Body diffusion coefficient；
(2) present invention can directly measure the volume change of unsaturated soil during the experiment, so as to consider unsaturation
The influence that soil body strain measures diffusion coefficient；
(3) change temperature, stress and suction during the experiment, continuously measure gas of the identical soil sample under different operating conditions and expand
Dissipate coefficient, comprehensive study Temperature-Stress-influence of the suction coupling to gas diffusivity.
To make the objectives, technical solutions, and advantages of the present invention more comprehensible, specific embodiment and phase will be passed through below
Attached drawing is closed, invention is further described in detail.
Detailed description of the invention
Fig. 1 is entirety of embodiment of the present invention measuring device schematic diagram；
Fig. 2 is air supply system structural schematic diagram in the embodiment of the present invention；
Fig. 3 is measuring system structural schematic diagram in the embodiment of the present invention；
Fig. 4 is exhaust treatment system structural schematic diagram in the embodiment of the present invention；
Fig. 5 is the central lumen organigram of measuring system in the embodiment of the present invention；
Figure label explanation: 1- search gas bottle, 2- inert gas bottle, 3- pressure reducer, 4- humidity controller, 5- air intake valve,
6- drain tap, 7- control valve, 8- temperature sensor, 9- thermoregulator, 10- hygrometer, 11- gas concentration sensor,
12- capillary, 13- fan, 14- permeable stone, 15- porous plate, 16- cutting ring, 17- loading device, 18- pressure sensor, 19-
Move amesdial, 20- measuring system, 21- sealing rubber ring, 22- sealing rubber pad, 23- support, 24- connection bolt, 25- gas
Absorption tower.
Specific embodiment
As shown in Fig. 1 ~ 5, gas diffusivity measuring device in a kind of unsaturated soil, including measuring system 20, it is described
Measuring system include central lumen and positioned at central lumen periphery temperature controlled compartment 1., the central chamber is provided with porous plate 15
With the permeable stone 14 for being located at 15 top of porous plate and being moved up and down by the driving of loading device 17, permeable stone is plate structure, described
Porous plate 15 and permeable stone 14 central lumen is separated into the Passive diffusion chamber being sequentially distributed from top to bottom 2., sample chamber it is 3. and main
Dynamic diffusion chamber is 4.；The sample cavity inner sleeve is equipped with the cutting ring 16 to accommodate soil pattern, can stretch after 14 downlink of permeable stone
Enter in cutting ring 16, rforated plate bracing cutting ring, the Passive diffusion chamber be connected with inert gas inleting pipe, the active diffusion chamber
It is connected with search gas air inlet pipe, 4 He of humidity controller is in series on the inert gas inleting pipe and search gas air inlet pipe
The diameter of air intake valve 5, active and passive diffusion chamber is consistent with height, and permeable stone 14 moves up and down the shadow to Passive diffusion chamber height
Sound is ignored, and the diameter of sample chamber is slightly larger than the diameter of active and passive diffusion chamber, the internal diameter of cutting ring and active and passive diffusion chamber
Diameter is identical.
In the present embodiment, measuring system is integrally made of cast iron, and has more sections to be bolted by connection,
The mating surface of connection is sealed using sealing rubber ring 21 and sealing rubber pad 22, and measuring system bottom has support 23.
In the present embodiment, the measuring system side is provided with search gas bottle 1 and inert gas bottle 2, inert gas
The inlet end of air inlet pipe is connected with inert gas bottle 2, and search gas air inlet pipe is connected with search gas bottle 1, the tracer
The bottleneck of gas bottle 1 and inert gas bottle 2 is equipped with valve and pressure reducer 3.
In the present embodiment, exhaust pipe, the measurement system is also respectively connected in the Passive diffusion chamber and active diffusion chamber
System side is provided with the absorption column of gas 25 being connected with exhaust pipe outlet side, is in series with drain tap 6 on exhaust pipe.
In the present embodiment, search gas bottle 1, inert gas bottle 2, search gas air inlet pipe, inert gas inleting pipe with
And corresponding control unit forms air supply system, air supply system controls gas relative humidity by humidity controller, is based on suction
With the relationship of relative humidity, the suction in unsaturated soil is controlled, simulates the matric suction in live unsaturated soil；Measurement system
Stress suffered by the temperature and soil that system passes through temperature controlled compartment and loading device control experiment, is simulated suffered by unsaturated soil scene
Temperature and stress, using the concentration of the active and passive diffusion chamber search gas of gas concentration sensor real-time measurement；Absorption column of gas,
Exhaust pipe and corresponding control unit form exhaust treatment system, mainly for the treatment of contaminated off-gas, whole process measurement dress
It sets exhaust pipe to connect with absorption column of gas, guarantees that experimentation does not cause air pollution.The measuring device can measure temperature-
Gas diffusivity in unsaturated soil under stress-suction coupling has simple structure, and versatility is high, easy to operate etc.
Advantage is provided simultaneously with important engineering significance and practical value.
In the present embodiment, fan 13, Passive diffusion chamber are separately installed in the Passive diffusion chamber and active diffusion chamber
Top and active diffusion chamber bottom are separately installed with hygrometer 10, gas concentration sensor 11 and the capillary being in communication with the outside
12, there is in capillary 12 drop；Cooperate air intake valve and drain tap by guttiferous capillary, adjusts in diffusion chamber
Air pressure is identical as atmospheric pressure, and when observation drop reaches stable, i.e., when no longer moving in capillary, intracavitary air pressure and atmospheric pressure are just
Reach equilibrium state；By smearing vaseline in soil device cutting ring inner wall, prevent the predominant current of gas diffusion along cutting ring inner wall
It generates；Pass through the gas concentration of gas concentration sensor real-time measurement diffusion chamber.Temperature control liquid is injected in temperature controlled compartment, and is led to
Excess temperature adjuster and temperature sensor control and detect respectively the temperature of diffusion chamber；It is controlled suffered by soil by loading device
Stress, and by the deflection of displacement amesdial measurement soil pattern under stress；By installing low speed rotation in diffusion chamber
Dynamic fan guarantees that the indoor gas mixing of chamber is uniform；By placing permeable stone on pedotheque top, lower part installation is porous
Plate guarantees not hindering gas to spread by soil pattern again while experiment applies pressure to soil pattern.
In the present embodiment, the liquid injection pipe of injection temperature control liquid in oriented temperature controlled compartment, fluid injection are connected at the top of the temperature controlled compartment
Be in series with control valve 7 on pipe, be separately installed with temperature sensor 8 at the top and bottom of temperature controlled compartment, temperature controlled compartment inner sidewall upper portion and
Lower part is separately installed with thermoregulator 9, and thermoregulator controls experiment required temperature using electrical bar.
In the present embodiment, the loading device 17 uses servo hydraulic cylinder, and the telescopic rod of servo hydraulic cylinder is by passively expanding
Scattered top of chamber is connected by pressure sensor 18 with permeable stone 14 after penetrating, and is equipped with above Passive diffusion chamber and is watched to measure
Take the displacement amesdial 19 of the telescopic rod displacement of hydraulic cylinder；The telescopic rod of servo hydraulic cylinder by Passive diffusion top of chamber through-hole
It penetrates, is provided with sealing ring in the through-hole.
Gas diffusivity measurement method in a kind of unsaturated soil, using gas diffusivity in soil as described above
Measuring device, comprising the following steps:
(1) cutting ring enchashment field unsaturated soil sample is used, the size of the measuring device and the physical parameter of soil pattern are measured,
Height including soil patternh(the namely height of cutting ring)；The height of active and passive diffusion chamberH, cutting ring internal diameterDAnd soil
The initial porosity of sample, then the cutting ring with unsaturated soil sample is placed in sample chamber；
(2) drain tap on the exhaust pipe of the air intake valve and active and passive diffusion chamber on inert gas inleting pipe is opened, to quilt
Dynamic diffusion chamber is passed through inert gas, by humidity controller by the regulation of relative humidity of inert gas to target value, to soil-like
Pedotheque (can be taken out and be weighed to judge whether it reaches quality and stablize) after reaching stable by the mass change of product, then
Pedotheque reaches the corresponding suction value of relative humidity, and the relationship between the suction and relative humidity of pedotheque can use following formula table
Show:, whereinFor the suction (kPa) of pedotheque,For universal gas constant,For absolutely temperature
It spends (K)；For the ratio volume (m of water3/ kg)；For the partial vapor pressure (kPa) of pore water,For at the same temperature,
Saturated vapor pressure (kPa) above pure water plane,For relative humidity；For the molal weight (18.016g/ of hydrone
Mol)；
(3) temperature of temperature controlled compartment is adjusted by thermoregulator to required temperature is tested, loading device is by permeable stone to soil
Earth sample, which applies, tests required stress, when pedotheque reaches stable, measure the compressed height of pedotheque, meter
Calculate the body strain of pedotheque, whereinFor in stressAct on the volume change of lower pedotheque；VFor
Pedotheque initial volume；hFor the elemental height of pedotheque；The pedotheque measured for displacement amesdial is compressed
Highly；The deformation of pedotheque particle is ignored in body strain based on pedotheque, then the body strain of pedotheque is due to hole
Compression generate, therefore can calculate by the porosity of compressed pedotheque, whereinFor the first of the soil body
Beginning porosity can then be calculated by the gas porosity of compressed pedotheque, wherein
For the saturation degree of soil pattern, the porosity of pedotheque refers to all holes in pedotheque in pedotheque herein
Accounting, and gas porosity is then accounting of the gas hole in pedotheque.
(4) search gas of concentration needed for testing is injected into active diffusion chamber, adjusts the air pressure in active and passive diffusion chamber
To atmospheric pressure, opens fan and guarantee that gas mixing is uniform in diffusion chamber, is diffused coefficient measurement experiment；Utilize active and passive expansion
Dissipate intracavitary trace gas concentration and timetRelationship:, to experiment number
Straight slope is obtained according to regression analysis is carried out, calculate gas diffusivity in unsaturated soil sample,, whereinFor active diffusion chambertThe trace gas concentration at moment,For Passive diffusion chambertMoment
Trace gas concentration；Active diffusion chamber trace gas concentration when to start diffusion；Passively to expand when starting diffusion
Dissipate chamber trace gas concentration；For in the stress of applicationThe height of soil sample when lower soil deformation reaches stable；HBased on, quilt
The height of dynamic diffusion chamber；To apply stressThe gas porosity of pedotheque afterwards；ForFirst positive root of (n=1,2,3 ...)；U is regression constant, is obtained in regression analysis
, the measurement of soil gas diffusion coefficient is not influenced.
The present invention can control Temperature-Stress-suction of unsaturated soil sample, and measure Temperature-Stress-suction coupling
Act on lower unsaturated soil gas diffusivity；The volume of unsaturated soil sample during the experiment can be directly measured to become
Change, so as to consider under stress, influence that unsaturated soil volume change measures diffusion coefficient；The present invention can lead to
It crosses a soil pattern and changes temperature, suction, stress in experimentation, continuously measure identical soil pattern under different operating conditions
Gas diffusivity, the feature for having versatility high, practical.
Any technical solution disclosed in aforementioned present invention unless otherwise stated, if it discloses numberical range,
Disclosed numberical range is preferred numberical range, and any it should be appreciated by those skilled in the art preferred numberical ranges
The only obvious or representative numerical value of technical effect in many enforceable numerical value.It, can not since numerical value is more
Exhaustion, so the present invention just discloses technical solution of the component values to illustrate the present invention, also, the above-mentioned numerical value enumerated is not
The limitation to the invention protection scope should be constituted.
If the present invention is open or relates to the components or structural member of connection fastened to each other, unless otherwise stated,
It is fixedly connected it is to be understood that connection (such as connecting using bolt or screw) can be removedly fixed, it is understood that are as follows:
It is non-removable to be fixedly connected with (such as riveting, welding), certainly, connection fastened to each other or integral structure (such as make
Manufactured with casting technique is integrally formed) replaced (obviously can not be using except integrally formed technique).
In addition, for indicating the art of positional relationship or shape applied in any technical solution disclosed in aforementioned present invention
Its meaning includes approximate with its, similar or close state or shape to language unless otherwise stated.
Either component provided by the invention by multiple individual component parts either assembled, or one
The separate part that forming technology manufactures.
Finally it should be noted that: the above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；To the greatest extent
The present invention is described in detail with reference to preferred embodiments for pipe, it should be understood by those ordinary skilled in the art that: still
It can modify to a specific embodiment of the invention or some technical features can be equivalently replaced；Without departing from this hair
The spirit of bright technical solution should all cover within the scope of the technical scheme claimed by the invention.
Claims (7)
1. gas diffusivity measuring device in a kind of unsaturated soil, it is characterised in that: including measuring system, the measurement system
System includes central lumen and the temperature controlled compartment positioned at central lumen periphery, and the central chamber is provided with porous plate and is located at porous
The permeable stone moved up and down is driven above plate and by loading device, central lumen is separated by upper by the porous plate and permeable stone
Passive diffusion chamber, sample chamber and the active diffusion chamber being sequentially distributed down；The sample cavity inner sleeve is equipped with to accommodate soil examination
The cutting ring of sample can protrude into cutting ring after the permeable stone downlink, and the Passive diffusion chamber is connected with inert gas inleting pipe, described
Active diffusion chamber is connected with search gas air inlet pipe, is in series with humidity in the inert gas inleting pipe and search gas air inlet pipe
Controller and air intake valve.
2. gas diffusivity measuring device in unsaturated soil according to claim 1, it is characterised in that: the measurement
System side is provided with search gas bottle and inert gas bottle, and the inlet end of inert gas inleting pipe is connected with inert gas bottle
It connects, search gas air inlet pipe is connected with search gas bottle, and the bottleneck of the search gas bottle and inert gas bottle is equipped with valve
Door and pressure reducer.
3. gas diffusivity measuring device in unsaturated soil according to claim 2, it is characterised in that: described passive
Exhaust pipe is also respectively connected in diffusion chamber and active diffusion chamber, and the measuring system side is provided with to be connected with exhaust pipe outlet side
The absorption column of gas connect is in series with drain tap on exhaust pipe.
4. gas diffusivity measuring device in unsaturated soil according to claim 1 or 2, it is characterised in that: described
Fan is separately installed in Passive diffusion chamber and active diffusion chamber, Passive diffusion top of chamber and active diffusion chamber bottom are installed respectively
There are hygrometer, gas concentration sensor and the capillary being in communication with the outside, there is drop in capillary.
5. gas diffusivity measuring device in unsaturated soil according to claim 1, it is characterised in that: the temperature control
Ceiling portion connects the liquid injection pipe of injection temperature control liquid in oriented temperature controlled compartment, and control valve, temperature controlled compartment top are in series on liquid injection pipe
It is separately installed with temperature sensor with bottom, temperature controlled compartment inner sidewall upper portion and lower part are separately installed with thermoregulator.
6. gas diffusivity measuring device in unsaturated soil according to claim 1, it is characterised in that: the load
Device use servo hydraulic cylinder, the telescopic rod of servo hydraulic cylinder penetrated by Passive diffusion top of chamber after by pressure sensor and thoroughly
Water stone is connected, and the displacement amesdial of the telescopic rod displacement to measure servo hydraulic cylinder is equipped with above Passive diffusion chamber.
7. gas diffusivity measurement method in a kind of unsaturated soil is expanded using gas in soil as described in claim 1
Dissipate coefficient measuring device, it is characterised in that: the following steps are included: (1) uses cutting ring enchashment field unsaturated soil sample, it will be with non-full
It is placed in sample chamber with the cutting ring of soil pattern；(2) it is passed through inert gas to Passive diffusion chamber, by the relatively wet of inert gas
Degree is adjusted to target value, and after the mass change of pedotheque reaches and stablizes, then pedotheque reaches the corresponding suction of relative humidity
Force value；(3) temperature for adjusting temperature controlled compartment applies experiment institute to pedotheque by permeable stone to required temperature, loading device is tested
Need stress, when pedotheque reaches stable, pedotheque is measured by compressed height, calculate the body of pedotheque
Strain；(4) search gas of concentration needed for testing is injected into active diffusion chamber, adjusts the air pressure in active and passive diffusion chamber
To atmospheric pressure, it is diffused coefficient measurement experiment；Utilize trace gas concentration and time in active and passive diffusion chambertRelationship pair
Experimental data carries out regression analysis and obtains straight slope, calculate gas diffusivity in unsaturated soil sample,, whereinFor active diffusion chambertThe trace gas concentration at moment,For Passive diffusion chambertWhen
The trace gas concentration at quarter；Active diffusion chamber trace gas concentration when to start diffusion；Quilt when to start diffusion
Dynamic diffusion chamber trace gas concentration；For in the stress of applicationThe height of soil sample when lower soil deformation reaches stable；HFor
The height of active and passive diffusion chamber；To apply stressThe gas porosity of pedotheque afterwards；ForFirst positive root of (n=1,2,3 ...)；U is regression constant.
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| CN110220823A (en) * | 2019-06-18 | 2019-09-10 | 东南大学 | A kind of easy device and method measuring gas diffusion coefficient in the soil body |
| CN110865009A (en) * | 2019-11-06 | 2020-03-06 | 长安大学 | Determination device and determination method for oxygen diffusion coefficient and consumption coefficient in asphalt mixture |
| CN111458274A (en) * | 2020-04-20 | 2020-07-28 | 福州大学 | Soil column device and method for measuring gas permeability and diffusion coefficient of unsaturated soil body |
| CN110455673B (en) * | 2019-09-03 | 2020-08-07 | 浙江大学 | Device and method for in-situ measurement of gas migration parameters in unsaturated soil layer through penetration |
| CN114279889A (en) * | 2020-09-28 | 2022-04-05 | 必照岩土科技(南京)有限公司 | Soil body VOC gas adsorption test device and test method |
| CN114414457A (en) * | 2022-01-17 | 2022-04-29 | 四川轻化工大学 | Soil body gas diffusion coefficient measuring device used in environmental rock field |
| CN115165675A (en) * | 2022-04-14 | 2022-10-11 | 福州大学 | Device and method for in-situ measurement of gas diffusion coefficient and permeability coefficient of unsaturated soil |
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| WO2021042813A1 (en) * | 2019-09-03 | 2021-03-11 | 浙江大学 | Device and method for in situ penetration measurement of gas transport parameters in unsaturated soil layer |
| US12007318B2 (en) | 2019-09-03 | 2024-06-11 | Zhejiang University | Device and method for in situ penetration measurement of gas transport parameters in unsaturated soil layer |
| CN110865009A (en) * | 2019-11-06 | 2020-03-06 | 长安大学 | Determination device and determination method for oxygen diffusion coefficient and consumption coefficient in asphalt mixture |
| CN111458274A (en) * | 2020-04-20 | 2020-07-28 | 福州大学 | Soil column device and method for measuring gas permeability and diffusion coefficient of unsaturated soil body |
| CN114279889A (en) * | 2020-09-28 | 2022-04-05 | 必照岩土科技(南京)有限公司 | Soil body VOC gas adsorption test device and test method |
| CN114414457A (en) * | 2022-01-17 | 2022-04-29 | 四川轻化工大学 | Soil body gas diffusion coefficient measuring device used in environmental rock field |
| CN115165675A (en) * | 2022-04-14 | 2022-10-11 | 福州大学 | Device and method for in-situ measurement of gas diffusion coefficient and permeability coefficient of unsaturated soil |
| CN115165675B (en) * | 2022-04-14 | 2024-07-02 | 福州大学 | Device and method for in-situ measurement of gas diffusion coefficient and permeability coefficient of unsaturated soil |
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