CN108344668A - Experimental provision for testing unsaturation dielectric gas diffusion coefficient and infiltration coefficient - Google Patents
Experimental provision for testing unsaturation dielectric gas diffusion coefficient and infiltration coefficient Download PDFInfo
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- CN108344668A CN108344668A CN201810438534.0A CN201810438534A CN108344668A CN 108344668 A CN108344668 A CN 108344668A CN 201810438534 A CN201810438534 A CN 201810438534A CN 108344668 A CN108344668 A CN 108344668A
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- 238000009792 diffusion process Methods 0.000 title claims abstract description 27
- 230000008595 infiltration Effects 0.000 title claims abstract description 14
- 238000001764 infiltration Methods 0.000 title claims abstract description 14
- 238000012360 testing method Methods 0.000 title claims abstract description 11
- 239000002689 soil Substances 0.000 claims abstract description 35
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 27
- 239000010935 stainless steel Substances 0.000 claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 238000002474 experimental method Methods 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 119
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- 239000003638 chemical reducing agent Substances 0.000 claims description 7
- 230000035699 permeability Effects 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 4
- 239000001569 carbon dioxide Substances 0.000 claims description 4
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000004088 simulation Methods 0.000 abstract description 4
- 230000008859 change Effects 0.000 abstract description 3
- 230000015556 catabolic process Effects 0.000 abstract description 2
- 238000011109 contamination Methods 0.000 abstract description 2
- 238000006731 degradation reaction Methods 0.000 abstract description 2
- 238000012546 transfer Methods 0.000 abstract description 2
- 239000000523 sample Substances 0.000 description 31
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 14
- 238000010586 diagram Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000008236 heating water Substances 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- TVEXGJYMHHTVKP-UHFFFAOYSA-N 6-oxabicyclo[3.2.1]oct-3-en-7-one Chemical compound C1C2C(=O)OC1C=CC2 TVEXGJYMHHTVKP-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000010791 domestic waste Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N13/00—Investigating surface or boundary effects, e.g. wetting power; Investigating diffusion effects; Analysing materials by determining surface, boundary, or diffusion effects
- G01N13/04—Investigating osmotic effects
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Fluid Mechanics (AREA)
- Sampling And Sample Adjustment (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses a kind of experimental provisions for testing unsaturation dielectric gas diffusion coefficient and infiltration coefficient, and the device mainly includes feeder, main body reaction unit and outlet gas treatment equipments.The feeder is used for heat transfer gas, the temperature change that the temperature that a garbage degradation generates is buried in simulation and outside air temperature variation generates containing water bath heating device；Main body reaction unit is made of lower room, middle room, upper chamber three parts, simulates refuse landfill aerogenesis, landfill yard overlying soil (or GCL) and soil sample top environment respectively.Its middle and upper part is loaded onto porous stainless steel plate by cylinder and pressurizes to soil sample (or GCL), simulates the soil pressure on the top landfill yard overlying soil (or GCL).Outlet gas collector is mainly made of gas collection bottle, can be handled the gas collection after reaction, and the gaseous contamination air after experiment is avoided.The apparatus structure is simple, and applicable range is wide.
Description
Technical field
The present invention relates to a kind of for testing the experimental provision of unsaturation dielectric gas diffusion coefficient and infiltration coefficient, can be
Constant temperature Imitating landfill yard actual conditions and the relevant parameter for measuring unsaturated porous media.
Background technology
Domestic waste during landfill disposal, using methane as the landfill gas of representative as greenhouse gases to natural ring
Border, which causes, to be seriously affected.Covering layer of landfill site covering system include gas lead layer, geomembrane, GCL (bentonite waterproof blanket),
Drainage blanket, vegetation topsoil play important function during landfill gas emission reduction.Therefore, to covering layer material gas diffusion
Requirement with permeance property also increasingly improves, and the real-time measurement of relevant parameter is the link that can not be ignored in scientific research and engineer application
One of.
It is general using conventional soil column leaching when carrying out the measurement of medium osmosis coefficient, diffusion coefficient both at home and abroad at present, it is passed through
Gas and after controlling pressure difference, obtains corresponding gas concentration for experimental analysis.The disadvantages of this method is that (1) is unable to control tested gas
Temperature is simultaneously kept constant, so that experimental result is influenced by the temperature difference；(2) it is tested soil sample and only passes through manual compaction's landfill, and fill
Covering layer system includes the geosynthetics such as upper earthing and GCL, and actually has certain error.(3) traditional soil column leaching
It is not easy to change soil sample attribute when measuring corresponding coefficient, tests more difficult accommodation.
To solve the above problems, the present invention provides one kind for testing unsaturation dielectric gas diffusion coefficient and infiltration system
Several experimental provisions.
Invention content
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide a kind of for testing the diffusion of unsaturation dielectric gas
The experimental provision of coefficient and infiltration coefficient in constant temperature Imitating landfill yard actual conditions and can measure unsaturated porous media
Relevant parameter.
The experimental provision for testing unsaturation dielectric gas diffusion coefficient and infiltration coefficient of the present invention, including gas supply dress
It sets, main body reaction unit and outlet gas treatment equipment；The unsaturation medium is soil sample or GCL.
The feeder includes pressure reducer, gas cylinder, pressure regulator, pressure gauge, water bath heating device and gas flow meter,
Two pressure reducers are arranged in the bottle mouth position of gas cylinder, and pressure regulator is connected by rubber tube one end with pressure reducer, and one end passes through heating water bath
It is connected with main reaction device after device, water bath heating device both ends respectively one pressure gauge of setting, rubber tube is located on rubber tube
Main body reaction unit is connected, gas flowmeter is set for conveying gas to main body reaction unit, before air inlet to monitor gas
Flow；
The main body reaction unit includes mainly acrylic cylinder, upper and lower fixation steel plate, porous stainless steel plate and bottom branch
Dagger；Acrylic cylinder is combined by upper, middle and lower segment, is divided into upper chamber, middle room, the part of lower room three, middle interior set two pieces it is porous not
Become rusty steel plate, and surveyed unsaturation medium is folded between two blocks of porous stainless steel plates, medium upper porous stainless steel plate connecting cylinder
Body carries out cylinder load, carries out burden pressure transmission, ensures the rigidity of porous stainless steel plate, is conducive to simulate on practical landfill yard
Cover being uniformly distributed for pressure.Upper chamber and lower room are respectively equipped with multiple valvular openings of peace, can be according to different experiments demand conduct
Air inlet or sample tap or placement gas flowmeter and pressure gauge, it is fixed up and down for monitoring pressure differential needed for experiment in real time
Steel plate is divided into acrylic cylinder both ends, is fixed by connecting bolt；Temperature prison is also posted in unsaturation medium upper and lower surface
Survey piece；
The gas collector includes gas collection bottle composition, and the gas generated in main body reaction unit is via rubber tube
It is passed through gas collection bottle, is collected in order to avoid polluting the environment.
In above-mentioned technical proposal, it is preferred that pressure gauge, which is set on rubber tube, is located at each 10cm in water bath heating device both ends
Place.
The gas diffusivity method for measuring that unsaturation medium is carried out using above-mentioned device, includes the following steps：
It is placed first between two blocks of porous stainless steel plates and is tested unsaturation medium, it is uniformly distributed to load 20~60kPa by cylinder
Load conveys gas on upper porous stainless steel plate and being transferred to medium from feeder to main body reaction unit：It closes first
Lower room opening is closed, upper chamber opening is opened, the air being passed through in nitrogen or carbon dioxide replacement upper chamber is closed upper chamber opening, opened
Lower room opening is passed through a certain concentration gas until upper and lower chamber pressure is equal；It closes room up and down to be open, room gas above and below Timing measurement
Concentration, until upper and lower room gas concentration is equal, diffusion reaches equilibrium state, obtains lower room concentration time curve, uses
The fitting of PolluteV7 softwares obtains the gas diffusivity of medium, or record balances used in room gas concentration at present and diffusion
Time is calculated using following formula and obtains diffusion coefficient：
In formula, Cr is lower room gas concentration, DpEffective diffusion cofficient, ε are unsaturation dielectric gas porosity, and L is non-full
With the thickness of medium, h=ε/La, LaFor medium bottom to the height of lower room bottom, α1For hL=αnLtan(αnL) (n=1,2,
3 ...) first positive root.
The gas permeability coefficient method for measuring that unsaturation medium is carried out using above-mentioned device, includes the following steps：
It is placed first between two blocks of porous stainless steel plates and is tested unsaturation medium, it is uniformly distributed to load 20~60kPa by cylinder
For load on upper porous stainless steel plate and being transferred to medium, it is extraneous to open upper chamber open communication, anti-from feeder to main body
Room under device is answered to convey gas, room charge flow rate is certain under controlling, and upper chamber installs gas flowmeter, records upper chamber gas flow Q,
Pressure gage is installed in upper and lower room respectively, records chamber pressure up and down, is upper chamber gas flow Q and P1 2-P2 2Relational graph, wherein P1For lower room
Gas pressure intensity, P2For the pressure of upper chamber gas, when gas reaches stable state, then linear relationship is presented in relational graph, fixed according to darcy
Rule, the slope of the linear relationship are the gas permeability coefficient of surveyed medium.
The present invention is passed through the temperature of gas using heating water bath control experiment, simulates the temperature ring in covering layer of landfill site
Border.It is loaded onto porous stainless steel plate using upper chamber cylinder to pressurize to soil sample transmission evenly load, simulates covering layer of landfill site soil layer
Cladding earth pressure simulates permeability and diffusivity of the gas in soil sample under landfill yard site environment.
Description of the drawings
Fig. 1 is a kind of concrete structure schematic diagram of apparatus of the present invention；
Fig. 2 is the structural schematic diagram of feeder；
Fig. 3 is the structural schematic diagram of GCL main body reaction units；
Fig. 4 is the structural schematic diagram of soil sample main body reaction unit；
Specific implementation mode
The invention will be further described with reference to the accompanying drawings and examples.
The device of the invention includes mainly feeder, main body reaction unit and outlet gas collector.The gas supply
Device is used for heat transfer gas containing water bath heating device, and the temperature that a garbage degradation generates and outside air temperature variation production are buried in simulation
Raw temperature change；Main body reaction unit is made of lower room, middle room, upper chamber three parts, is simulated refuse landfill aerogenesis respectively, is filled out
Bury an overlying soil (or GCL) and soil sample top environment.Its middle and upper part by cylinder be loaded onto porous stainless steel plate to soil sample (or
GCL it) pressurizes, the soil pressure on simulation covering layer of landfill site top, outlet gas collector is mainly made of gas collection bottle, can
To the gas collection processing after reaction, the gaseous contamination air after experiment is avoided..
As shown in attached drawing 1,2, the feeder includes that pressure reducer 1, gas cylinder 2, pressure regulator 3, pressure gauge 4, water-bath add
5 and gas flow meter 6 of thermal, the bottle mouth position of gas cylinder 2 are arranged two pressure reducers 1, pressure regulator 3 by 7 one end of rubber tube with subtract
Depressor 1 is connected, and one end is connected by water bath heating device 5 with main reaction device, each setting at 5 both ends 10cm of water bath heating device
One pressure gauge 4, setting gas flowmeter 6 is monitoring gas flow before main body reaction unit air inlet.
As shown in attached drawing 3,4, main body reaction unit can be that GCL experimental provisions or soil sample experimental provision, the two are only surveyed
Sample is different, agent structure all same, including sample tap 8, connection bolt 9, gas bottle 10, acrylic bucket 11, up and down fixed steel
Plate 12, porous stainless steel plate 13 and four bottom support columns 14 form.Acrylic bucket 11 divides for upper chamber, middle room, the portion of lower room three
Point, middle room is made of two blocks of porous stainless steel plates 13 and survey unsaturation soil sample, and soil sample top is connected with porous stainless steel plate 13
Cylinder carries out cylinder load, carries out burden pressure transmission, ensures the rigidity of porous stainless steel plate, is conducive to simulate practical landfill
Field burden pressure is uniformly distributed.Upper chamber and lower room are respectively equipped with multiple sample taps 8, can connect pressure gauge 4 according to different demands
Or gas flowmeter 6, upper and lower fixation steel plate 12 are fixed by four connection bolts 9.
The device of the invention can be used for measurement of the gas in soil sample or the infiltration coefficient and diffusion coefficient of GCL；Also it can carry out
Methane oxidation experimental study changes the property of soil sample, probes into using new materials such as charcoal, polymer in covering layer of landfill site
In application prospect.The testing program that application apparatus of the present invention are carried out with infiltration coefficient and diffusion coefficients below is said
It is bright.
According to testing program and purpose, needs to coordinate the soil sample of different moisture content and different structure and be set according to experiment
Between two blocks of porous stainless steel plates 13, cylinder is carried out by the cylinder that top steel plate is coupled and loads 20kPa, opens and sets
5 temperature of water bath heating device is set, gas cylinder 2 is opened after a period of time and pressure regulator 3 is passed through gas, wait stablizing.
(1) gas permeability coefficient is measured
The tops GCL pass through cylinder uniform pressurization, pressurization 20kpa simulation covering layer of landfill site top 1m soil thickness.It keeps
Device upper chamber gas outlet valve is opened, and lower room is passed through the air in the lower room of methane displacement, and when beginning is controlled down by air intake valve
Room charge flow rate is certain.Upper chamber installs gas flowmeter, records upper chamber gas flow, and pressure gage is installed in upper and lower room respectively, records
Upper and lower chamber pressure is upper chamber gas flow Q and P1 2-P2 2Relational graph then shows that gas reaches stable state, darcy if linear relationship
Law is applicable in.After upper and lower room gas migration is stablized, observe that chamber pressure up and down is poor, record chamber pressure up and down and by gas stream
Amount.Adjusting different pressure differences by adjusting lower room, (1-20kPa, pressure is less than 10kPa to practical covering layer of landfill site up and down, grinds
Study carefully that take 1-20kPa be to obtain infiltration coefficient to preferably verify Darcy's law).
Chamber pressure, upper chamber flow above and below under different draught heads are recorded according to Darcy's law, is Q~P1 2-P2 2Relational graph obtains
To osmotic coefficient k (i.e. Q and P1 2-P2 2Slope when linear relationship)：
In formula, k is the gas permeability coefficient of sample, Q2For by the gas flow of sample, ρ is the density of gas, and g attaches most importance to
Power acceleration, P1For the gas pressure intensity of lower room, P2For the pressure of upper chamber gas, A is the cross-sectional area of sample, and L is sample thickness.
It repeats the above steps, can measure influence of the influence factors such as different soil sample structures and soil sample water content to soil sample infiltration coefficient.
(2) gas diffusivity is measured
By taking GCL as an example, gas illustrates soil sample by taking methane as an example.The tops GCL are by cylinder pressurization 20kpa, by more
Hole stainless steel plate is transmitted to soil sample top, makes soil sample uniform force.Lower room valve is closed, upper chamber venthole is opened, leads in upper chamber
Enter the air in nitrogen or carbon dioxide replacement upper chamber, closes upper chamber.Upper chamber valve is closed, opens lower room venthole, in lower room
It is passed through methane, makes the air of the lower room of methane displacement, upper and lower room that pressure gage to be installed, ensures that room air pressure is equal up and down.Stop ventilation, closes
Lower room air inlet/outlet valve is closed, so that methane is diffused through GCL and enters upper chamber.Sample tap is respectively set in upper and lower room, timing
(1min) is sampled upper and lower room gas, measures room gas concentration up and down, until upper and lower room gas concentration is equal, diffusion reaches
Equilibrium state is divided into 60s between time of measuring.Reach stable time depending on the water content of GCL, water content is up to stablizing
It takes time longer.GCL or the diffusion coefficient of soil sample can be obtained by following data processing method.
1. described point fitting process：By the Concentration-time described point obtained by the above process, it is fitted, is found by PolluteV7 softwares
Diffusion coefficient when being fitted best.
2. equation：
In formula, J is gas diffusion flux, and z is depth, and Cr is lower room gas concentration, DpEffective diffusion cofficient, ε are the soil body
Gas porosity, L are the thickness of GCL samples, h=ε/La, LaFor the bottoms GCL to the height of lower room bottom, α1For hL=αnItan(αnL) first positive root of (n=1,2,3 ...).
Above-mentioned specific implementation mode is used for illustrating the present invention, rather than limits the invention, the present invention's
In spirit and scope of the claims, to any modifications and changes that the present invention makes, the protection model of the present invention is both fallen within
It encloses.
Claims (6)
1. a kind of experimental provision for testing unsaturation dielectric gas diffusion coefficient and infiltration coefficient, which is characterized in that including
Feeder, main body reaction unit and outlet gas treatment equipment；
The feeder include pressure reducer (1), gas cylinder (2), pressure regulator (3), pressure gauge (4), water bath heating device (5) and
Gas flowmeter (6), the bottle mouth position of gas cylinder (2) are arranged two pressure reducers (1), pressure regulator (3) by rubber tube (7) one end with subtract
Depressor (1) is connected, and one end is connected with main reaction device afterwards by water bath heating device (5), is added positioned at water-bath on rubber tube (7)
A pressure gauge (4) is respectively arranged in thermal (5) both ends, and rubber tube (7) connects main body reaction unit, is used for main body reaction unit
Gas is conveyed, gas flowmeter (6) is set before air inlet to monitor gas flow；
The main body reaction unit includes mainly acrylic cylinder (11), upper and lower fixation steel plate (12), porous stainless steel plate (13)
With bottom support column (14)；Acrylic cylinder (11) is combined by upper, middle and lower segment, is divided into upper chamber, middle room, the part of lower room three, in
Two pieces of porous stainless steel plates (13) are set in interior, and surveyed unsaturation medium is folded between two blocks of porous stainless steel plates, medium top
Porous stainless steel plate (13) connecting cylinder body carries out cylinder load, carries out burden pressure transmission, upper chamber and lower room are respectively equipped with more
A valvular opening (8) of peace, can be according to different experiments demand as air inlet or sample tap, and upper and lower fixation steel plate (12) is set up separately
In acrylic cylinder both ends, it is fixed by connecting bolt (9), temperature monitoring piece is also posted in unsaturation medium upper and lower surface；
The gas collector includes gas collection bottle (10) composition, and the gas generated in main body reaction unit is via rubber tube
It is passed through gas collection bottle (10), is collected.
2. the experimental provision according to claim 1 for testing unsaturation dielectric gas diffusion coefficient and infiltration coefficient,
It is located at water bath heating device (5) each 10cm in both ends it is characterized in that, pressure gauge (4) is set on rubber tube (7).
3. the experimental provision according to claim 1 for testing unsaturation dielectric gas diffusion coefficient and infiltration coefficient,
It is characterized in that, the unsaturation medium is soil sample or GCL.
4. application device as described in any one of claims 1-3 carries out the side that the gas diffusivity of unsaturation medium measures
Method, which is characterized in that include the following steps：
It is placed first between two blocks of porous stainless steel plates and is tested unsaturation medium, 20~60kPa evenly loads are loaded by cylinder
In on upper porous stainless steel plate and being transferred to unsaturation medium, gas is conveyed from feeder to main body reaction unit：First
Lower room opening is closed, upper chamber opening is opened, the air being passed through in nitrogen or carbon dioxide replacement upper chamber is closed upper chamber opening, beaten
It opens lower room opening and is passed through a certain concentration gas until upper and lower chamber pressure is equal；It closes room up and down to be open, room gas above and below Timing measurement
Bulk concentration, until upper and lower room gas concentration is equal, diffusion reaches equilibrium state, obtains lower room concentration time curve, uses
The fitting of PolluteV7 softwares obtains the gas diffusivity of unsaturation medium.
5. application device as described in any one of claims 1-3 carries out the side that the gas diffusivity of unsaturation medium measures
Method, which is characterized in that include the following steps：
It is placed first between two blocks of porous stainless steel plates and is tested unsaturation medium, 20~60kPa evenly loads are loaded by cylinder
In on upper porous stainless steel plate and being transferred to unsaturation medium, gas is conveyed from feeder to main body reaction unit：First
Lower room opening is closed, upper chamber opening is opened, the air being passed through in nitrogen or carbon dioxide replacement upper chamber is closed upper chamber opening, beaten
It opens lower room opening and is passed through a certain concentration gas until upper and lower chamber pressure is equal；It closes room up and down to be open, room gas above and below Timing measurement
Bulk concentration, until upper and lower room gas concentration is equal, diffusion reaches equilibrium state, records used in this room gas concentration and diffusion at present
Time, using following formula：
In formula, CrFor lower room gas concentration, DpEffective diffusion cofficient, ε are unsaturation dielectric gas porosity, and L is unsaturation medium
Thickness, h=ε/La, LaFor unsaturation medium bottom to the height of lower room bottom, α1For hL=αnLtan(αnL) (n=1,2,
3 ...) first positive root.
6. application device as described in any one of claims 1-3 carries out the side that the gas permeability coefficient of unsaturation medium measures
Method, which is characterized in that include the following steps：
It is placed first between two blocks of porous stainless steel plates and is tested soil sample, 20~60kPa evenly loads are loaded in top by cylinder
On porous stainless steel plate and it is transferred to unsaturation medium, the upper chamber open communication external world is opened, reacts and fill from feeder to main body
Lower room conveying gas is set, room charge flow rate is certain under controlling, and upper chamber installs gas flowmeter, records upper chamber gas flow Q, up and down
Pressure gage is installed in room respectively, records chamber pressure up and down, is upper chamber gas flow Q and P1 2-P2 2Relational graph, wherein P1For the gas of lower room
Body pressure, P2For the pressure of upper chamber gas, when gas reaches stable state, then linear relationship is presented in relational graph, should according to Darcy's law
The slope of linear relationship is the gas permeability coefficient of surveyed unsaturation medium.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810438534.0A CN108344668B (en) | 2018-05-09 | Experimental device for be used for testing unsaturated medium gas diffusion coefficient and osmotic coefficient |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810438534.0A CN108344668B (en) | 2018-05-09 | Experimental device for be used for testing unsaturated medium gas diffusion coefficient and osmotic coefficient |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108344668A true CN108344668A (en) | 2018-07-31 |
| CN108344668B CN108344668B (en) | 2024-07-30 |
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| CN109839494A (en) * | 2019-03-18 | 2019-06-04 | 合肥工业大学 | A kind of experimental rig for surveying capillary gas phase seepage effect area size |
| CN109883892A (en) * | 2019-03-26 | 2019-06-14 | 福州大学 | Gas diffusivity measuring device and method in a kind of unsaturated soil |
| CN111024579A (en) * | 2019-12-13 | 2020-04-17 | 东南大学 | Device for testing gas diffusion coefficient under different contact of GM/GCL |
| CN111208042A (en) * | 2020-02-07 | 2020-05-29 | 中国科学院武汉岩土力学研究所 | Device and method for inverting hydraulic parameters of unsaturated waste soil |
| 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 |
| 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 |
| CN114993917A (en) * | 2022-06-15 | 2022-09-02 | 江苏科技大学 | Device and method for continuously testing gas permeability coefficient of unsaturated soil body under variable suction |
| CN115508256A (en) * | 2022-10-20 | 2022-12-23 | 福州大学 | Gas injection ball for measuring gas permeability coefficient and diffusion coefficient of soil in pre-embedded mode |
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