CN110220823A - A kind of easy device and method measuring gas diffusion coefficient in the soil body - Google Patents
A kind of easy device and method measuring gas diffusion coefficient in the soil body Download PDFInfo
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- CN110220823A CN110220823A CN201910530455.7A CN201910530455A CN110220823A CN 110220823 A CN110220823 A CN 110220823A CN 201910530455 A CN201910530455 A CN 201910530455A CN 110220823 A CN110220823 A CN 110220823A
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- diffuser casing
- soil body
- diffusion coefficient
- gas
- specimen holder
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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
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- 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
-
- 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
- G01N2013/003—Diffusion; diffusivity between liquids
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- 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
- G01N2015/0007—Investigating dispersion of gas
- G01N2015/0015—Investigating dispersion of gas in solids
Abstract
The present invention discloses a kind of easy device and method for measuring gas diffusion coefficient in the soil body, the device includes horizontal positioned diffuser casing, the side of the diffuser casing is bolted specimen holder by connection, soil sample is provided with inside the specimen holder, it is provided with nitrogen inlet and gas outlet on the diffuser casing, oxygen sensor is installed inside the diffuser casing.The present invention can simply and efficiently measure diffusion coefficient of the gas in the soil body, and measurement result is more accurate.
Description
Technical field:
The present invention relates to a kind of easy devices and method for measuring gas diffusion coefficient in the soil body, belong to building and environment
The technical field of engineering.
Background technique:
Fluid migration research is in the hydrology, geology, biology, ecological environment, oil-gas mining, chemical engineering and film in pore media
There is very important meaning in the fields such as engineering, thus get more and more people's extensive concerning.
The soil body is the most common pore media, and it is also that there are widest holes that the gas migration in the soil body, which is exactly most common,
One of medium flow field.It is native for improvement ecological environment of soil, raising agricultural production efficiency, prevention and treatment to study gas motion rule in the soil body
Body corrodes and salination, prevents the Practical Projects such as coating of underground water pollution, rational deployment refuse landfill extremely important.
Soil body air is the important component of the soil body, is present in soil body hole, and constantly in soil from atmosphere
It is moved in body opening gap, while carrying out gas exchanges with atmosphere.Since air and moisture collectively reside in soil body hole, soil mass water
The variation divided necessarily leads to the variation of air content in the soil body, and then influences the aeration status of the soil body.And the friendship of soil body air
If change owner is realized by aeration porosity interconnected in the soil body, and soil body macrovoid is the main thoroughfare of soil body ventilation, because
This macroporous ratio and quantity are to determine the internal factor of soil body venting capability.The activity of microorganism in the soil body, physics and
Chemical process has soil body air regime directly related.Than air, the VOC gas in organic contamination place, rubbish are filled out
Bury the methane in field, carbon dioxide isothermal chamber gas can also puncture overburden layer and cause damages to surrounding enviroment.Therefore research gas
Transportation law of the body in the soil body, testing its characterization parameter seems particularly significant.The exchange of the soil body and atmosphere mainly passes through soil
Hole interconnected carries out in body, and main gas exchanges mechanism is gas diffusion movement.Gas diffusion in the soil body
Speed degree soil body gas diffusivity (Ds) characterize.DsAcquisition only there are two approach: actual measurement is estimated by model
It calculates.Although it is available to have many measurement methods at present, the relevant technologies also comparative maturity mostly uses greatly double gas chambers diffusions
Principle, and structure is complicated, lacks simple, efficient test equipment.
Summary of the invention:
The purpose of the present invention is provide a kind of letter for measuring gas diffusion coefficient in the soil body in view of the above problems
Easy device and method can simply and efficiently measure diffusion coefficient of the gas in the soil body, and measurement result is more accurate.
Above-mentioned purpose of the invention can be achieved through the following technical solutions:
A kind of easy device measuring gas diffusion coefficient in the soil body, including horizontal positioned diffuser casing, the diffusion
The side of room is bolted specimen holder by connection, is provided with soil sample inside the specimen holder, is provided with nitrogen on the diffuser casing
Gas air inlet and air outlet, the diffuser casing the inside are equipped with oxygen sensor.
The easy device of measurement gas diffusion coefficient in the soil body, sets between the diffuser casing and the specimen holder
It is equipped with rubber ring.
The survey of gas diffusion coefficient in the soil body is carried out with the easy device of said determination gas diffusion coefficient in the soil body
Determine method, this method comprises the following steps:
Step 1: the easy device is placed in seal box, without friction, without sunlight direct projection, while in seal box
Humidifier is placed, guarantee test environment is in humidity constant state；
Step 2: inspection apparatus function before measurement；
Step 3: the air inlet of diffuser casing is connected nitrogen transmitting device, pressure value is adjusted；
Step 4: ready soil sample is put into specimen holder, and specimen holder is connect surely by bolt with diffuser casing
It is fixed；
Step 5: opening nitrogen inlet and the nitrogen gas outlet of diffuser casing, diffuser casing is passed through from nitrogen inlet
100% nitrogen, original air is discharged from gas outlet in diffuser casing, until the oxygen content that sensor measures is zero, then holds
Nitrogen inlet and gas outlet are closed after continuous 3-5s；
Step 6: starting gas diffusion and timing, oxygen sensor after the valve of nitrogen inlet and gas outlet is shut
Device measures O in diffuser casing2Concentration change with time, and according to gas transport principle calculate diffusion coefficient.
The utility model has the advantages that
1. entire test apparatus is placed in during the test in closed chest, the work for the humidifier placed in case
It ensure that the moisture content of the soil body in diffusion process is constant under.This test apparatus compares with test apparatuses most of in society,
It does not need to prevent instrument in a dry environment, therefore the time of test can be increased, soil sample used in test will not be because
The gas permeability coefficient obtained required for always influencing is dehydrated for test process, the test result being achieved in that is more accurate.
2. being had the advantage that compared with the traditional sensors of market using oxygen sensor for KE-25 in test apparatus
Long-life is not influenced by carbon dioxide, carbon monoxide, hydrogen sulfide, oxynitrides and hydrogen, at low cost, at normal temperature
Working condition is good, and signal input is stablized, and when use is not required to heating and is not required to external power supply.
3. test apparatus using relatively easy, operation is easy to operate, and measuring process is less, with Fick second law,
Measuring the concentration changing rule that oxygen enters diffuser casing through the soil body by oxygen sensor can be obtained soil body air penetration system
Number, as a result accurately.
Detailed description of the invention:
Fig. 1 is the easy device structural schematic diagram of measurement gas diffusion coefficient in the soil body of the invention.
Figure label explanation: 1. soil samples；2. rubber ring；3. specimen holder；4. connecting bolt；5. nitrogen inlet；6. outlet
Mouthful；7. oxygen sensor；8. diffuser casing.
Specific embodiment:
The following further describes the present invention in detail with reference to the accompanying drawings and specific embodiments.
The easy device of measurement gas diffusion coefficient in the soil body of the invention, it is described including horizontal positioned diffuser casing 8
The side of diffuser casing connects specimen holder 3 by connection bolt 4, is provided with soil sample 1 inside the specimen holder, sets on the diffuser casing
It is equipped with nitrogen inlet 5 and gas outlet 6, oxygen sensor 7 is installed inside the diffuser casing.The diffuser casing and the sample
Rubber ring 2 is provided between seat.The oxygen sensor of the present embodiment is the KE-25 type gas sensing of Japanese Figaro company production
Device, external a set of importing nitrogen device, entire process instruments of testing are placed in closed container, and humidification dress is also placed in container
It sets, tested soil moisture content is constant during guaranteeing entire test.The soil body type of this instrument measurable includes various partial sizes
Sand, clay, processing mode are the common processing mode of geotechnical engineering laboratory test, can guarantee operability of the invention and
It promotes.
Fig. 1 show the structural schematic diagram of the device of the invention, and testing procedure is as follows:
It is of the invention for measuring the measuring method of gas diffusivity in the soil body, include the following steps and method:
Step 1: instrument is put in place, guarantee where placing completely, to be located in seal box, without friction, nothing
Direct sunlight, case is interior to place humidifier, and guarantee test environment is in humidity constant state, and guarantee reaches optimum operation performance, obtains most
Good measurement result；
Step 2: before measuring, the calibration of instrument and function have to check for；
Step 3: diffuser casing is connected nitrogen transmitting device, air will be cleaned, be dried, and adjust pressure value；
Step 4: soil body sample preparation is put into the specimen holder of thick rubber seal at required state, it is inserted into bracket,
Make sample securely and complete to seal, and opens the humidifier in seal box；
Step 5: opening gas outlet and the air inlet of side portion gas chamber, the nitrogen of diffuser casing 100% is passed through from air inlet,
Air is discharged from gas outlet, closes air inlet/outlet until the oxygen content that measures of sensor is zero, then persistently after 3-5s；
Step 6: the valve at gas chamber both ends is shut, start gas diffusion and timing, O2Sensor measures O in diffuser casing2
Concentration change with time, and according to gas transport principle calculate diffusion coefficient, can be obtained by Fick First Law:
In formula: q is into diffuser casing gas flow, cm3；T is diffusion time, s；A is that soil body diffusingsurface area is (horizontal in cutting ring
Sectional area), cm2；Hs is the height of soil sample, cm；D'SFor the gas diffusivity of the earth pillar, cm2/s；Δ C is soil sample both ends
O2Concentration difference, g/cm3。O2Diffusing into the indoor volume of the diffusion rate that changes with time can also indicate are as follows:
In formula: hc is the height of diffuser casing, cm.
Formula (1) and (2) simultaneous can be obtained:
Start time (t=0), O in diffuser casing2Concentration is 0, the atmosphere O of connection2Concentration is C0, the O at soil sample both ends at this time2
Concentration difference Δ C0=C0；After diffusion starts, O2It is diffused in diffuser casing by soil sample, causes O in diffuser casing2Concentration increases, in t
Moment, diffuser casing O2Concentration is f (t), atmosphere O2Concentration is held constant at C0, soil sample both ends O2Concentration difference is Δ Ct=C0-f(t)。
By primary condition t=0, Δ Ct=Δ C0=C0, 0-t is carried out to equation both ends and is integrated:
It enablesThen formula (4) becomes:
It drawsWith the scatter plot of t, obtaining slope is K value, introduces correction coefficient Kj:
In formula, DsFor diffusion coefficient after correction, D'STo correct preceding diffusion coefficient, α1For equation
First be greater than 0 solution.Ds/D0It is the soil body gas diffusivity and the gas that directly measure under mutually synthermal atmospheric pressure
The ratio between diffusion coefficient in free atmosphere.DsIt is calculated according to formula (6).D0Temperature correction is then carried out according to the following formula:
Wherein D0(T1) indicate the diffusion coefficient that oxygen is spread in zero degree from oxygen to nitrogen, it is 0.181cm2/s。
It should be understood that above-described embodiment is merely to illustrate the specific embodiment of technical solution of the present invention, rather than limitation is originally
The range of invention.After the present invention has been read, those skilled in the art to the modifications of various equivalent forms of the invention and replace
It changes and falls within protection scope defined by the claim of this application.
Claims (3)
1. a kind of easy device for measuring gas diffusion coefficient in the soil body, which is characterized in that including horizontal positioned diffuser casing,
The side of the diffuser casing is bolted specimen holder by connection, is provided with soil sample inside the specimen holder, on the diffuser casing
It is provided with nitrogen inlet and gas outlet, oxygen sensor is installed inside the diffuser casing.
2. the easy device of measurement gas diffusion coefficient in the soil body according to claim 1, which is characterized in that the expansion
It dissipates and is provided with rubber ring between room and the specimen holder.
3. a kind of easy device with said determination gas diffusion coefficient in the soil body carries out gas diffusion coefficient in the soil body
Measuring method, which is characterized in that this method comprises the following steps:
Step 1: the easy device is placed in seal box, without friction, without sunlight direct projection, while being placed in seal box
Humidifier, guarantee test environment are in humidity constant state；
Step 2: inspection apparatus function before measurement；
Step 3: the air inlet of diffuser casing is connected nitrogen transmitting device, pressure value is adjusted；
Step 4: ready soil sample is put into specimen holder, and specimen holder is passed through into bolt and diffuser casing stable connection；
Step 5: opening nitrogen inlet and the nitrogen gas outlet of diffuser casing, diffuser casing 100% is passed through from nitrogen inlet
Nitrogen, original air is discharged from gas outlet in diffuser casing, until the oxygen content that sensor measures is zero, then persistently after 3-5s
Close nitrogen inlet and gas outlet；
Step 6: starting gas diffusion and timing after the valve of nitrogen inlet and gas outlet is shut, oxygen sensor is surveyed
Determine O in diffuser casing2Concentration change with time, and according to gas transport principle calculate diffusion coefficient.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910530455.7A CN110220823A (en) | 2019-06-18 | 2019-06-18 | A kind of easy device and method measuring gas diffusion coefficient in the soil body |
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| CN201910530455.7A CN110220823A (en) | 2019-06-18 | 2019-06-18 | A kind of easy device and method measuring gas diffusion coefficient in the soil body |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111024579A (en) * | 2019-12-13 | 2020-04-17 | 东南大学 | Device for testing gas diffusion coefficient under different contact of GM/GCL |
| 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 |
| CN114354450A (en) * | 2022-01-12 | 2022-04-15 | 兰州大学 | Method for measuring soil relative gas diffusion coefficient under different soil water potential and volume weight |
| 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 |
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| CN2384217Y (en) * | 1999-07-29 | 2000-06-21 | 东南大学 | Measurer for heat wet mobile character of porous medium containing wet |
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| CN103245596A (en) * | 2013-05-14 | 2013-08-14 | 南京工程学院 | Method for determining gas permeability coefficient of concrete |
| CN206223598U (en) * | 2016-11-30 | 2017-06-06 | 安徽理工大学 | A kind of easy soil gas diffusivity and gas conductivity determine device |
| CN109883892A (en) * | 2019-03-26 | 2019-06-14 | 福州大学 | Gas diffusivity measuring device and method in a kind of unsaturated soil |
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| CN2384217Y (en) * | 1999-07-29 | 2000-06-21 | 东南大学 | Measurer for heat wet mobile character of porous medium containing wet |
| WO2008122800A1 (en) * | 2007-04-09 | 2008-10-16 | The University Of Bristol | Probe microscopy and probe position monitoring apparatus |
| CN103245596A (en) * | 2013-05-14 | 2013-08-14 | 南京工程学院 | Method for determining gas permeability coefficient of concrete |
| CN206223598U (en) * | 2016-11-30 | 2017-06-06 | 安徽理工大学 | A kind of easy soil gas diffusivity and gas conductivity determine device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111024579A (en) * | 2019-12-13 | 2020-04-17 | 东南大学 | Device for testing gas diffusion coefficient under different contact of GM/GCL |
| 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 |
| CN114354450A (en) * | 2022-01-12 | 2022-04-15 | 兰州大学 | Method for measuring soil relative gas diffusion coefficient under different soil water potential and volume weight |
| CN114354450B (en) * | 2022-01-12 | 2024-01-26 | 兰州大学 | Method for measuring relative gas diffusion coefficient of soil under different soil water potential and volume weight |
| 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 |
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Application publication date: 20190910 |
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