CN111487297B - Method and device for measuring suction force of polluted soil body and concentration of pore solution - Google Patents
Method and device for measuring suction force of polluted soil body and concentration of pore solution Download PDFInfo
- Publication number
- CN111487297B CN111487297B CN202010330695.5A CN202010330695A CN111487297B CN 111487297 B CN111487297 B CN 111487297B CN 202010330695 A CN202010330695 A CN 202010330695A CN 111487297 B CN111487297 B CN 111487297B
- Authority
- CN
- China
- Prior art keywords
- solution
- sample
- gas
- soil
- suction force
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000002689 soil Substances 0.000 title claims abstract description 124
- 239000011148 porous material Substances 0.000 title claims abstract description 87
- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000012360 testing method Methods 0.000 claims abstract description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000000126 substance Substances 0.000 claims abstract description 26
- 238000000502 dialysis Methods 0.000 claims abstract description 11
- 230000003204 osmotic effect Effects 0.000 claims abstract description 10
- 238000005259 measurement Methods 0.000 claims abstract description 9
- 239000000243 solution Substances 0.000 claims description 197
- 239000000523 sample Substances 0.000 claims description 158
- 239000007789 gas Substances 0.000 claims description 112
- 230000002572 peristaltic effect Effects 0.000 claims description 35
- 239000012085 test solution Substances 0.000 claims description 27
- 238000001035 drying Methods 0.000 claims description 24
- 229920006395 saturated elastomer Chemical class 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 16
- 239000012266 salt solution Substances 0.000 claims description 16
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical class [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 14
- KWGKDLIKAYFUFQ-UHFFFAOYSA-M lithium chloride Chemical compound [Li+].[Cl-] KWGKDLIKAYFUFQ-UHFFFAOYSA-M 0.000 claims description 10
- 239000000758 substrate Substances 0.000 claims description 7
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Chemical class [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 claims description 6
- 229910000027 potassium carbonate Inorganic materials 0.000 claims description 6
- 239000011780 sodium chloride Chemical class 0.000 claims description 6
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical class [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims description 6
- 229910000368 zinc sulfate Inorganic materials 0.000 claims description 6
- 239000011686 zinc sulphate Chemical class 0.000 claims description 6
- 239000012528 membrane Substances 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 5
- 239000004575 stone Substances 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical class [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 claims 1
- 229910052939 potassium sulfate Inorganic materials 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 3
- 239000011159 matrix material Substances 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 230000001066 destructive effect Effects 0.000 description 3
- 238000002310 reflectometry Methods 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 238000011068 loading method Methods 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 231100001240 inorganic pollutant Toxicity 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/22—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance
- G01N27/221—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating capacitance by investigating the dielectric properties
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/06—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a liquid
Abstract
The invention provides a method and a device for measuring the suction force of a polluted soil body and the concentration of a pore solution, wherein the method comprises the following steps: preparing a standard sample, performing a calibration test, calibrating a fitting curve, controlling the suction force of the sample, recording and analyzing data, and calculating the suction force of the sample and the concentration of a pore solution; the device comprises: the device comprises a top cover, a soil column chamber, a base, a chemical solution circulating system, a gas circulating system and a data acquisition system; the invention adopts dialysis method and gas phase method to control the suction in soil accurately, can measure the corresponding matrix suction and osmotic suction of different chemical polluted soil under different water content, adopts TDR technology to measure the water content of soil and the concentration of pore solution, can realize the combined measurement of the suction in soil and the concentration of pore solution according to the corresponding relation between the soil-water characteristic curve and the conductivity of pore solution and the concentration of pore solution, and has the advantages of high precision, high speed, no damage, automatic monitoring and the like.
Description
Technical Field
The invention relates to the technical field of geological engineering and civil engineering (geotechnical), in particular to a method and a device for measuring the suction force of a polluted soil body and the concentration of a pore solution.
Background
Industrial and mining enterprises such as solid waste disposal sites, chemical plants, nonferrous metal smelting plants and the like discharge a large amount of organic and inorganic pollutants to the surrounding environment during the construction and operation, so that the original sites become serious pollution sites. In a polluted site, engineering properties of polluted soil and migration of pollutant solutes in pore solution are two of the most concerned problems.
The suction force of the soil is an important parameter for researching the engineering property of unsaturated polluted soil, and the change of the water content and the concentration of pore solution reflects the migration rule of solute in the polluted soil. In order to carry out intensive research on the polluted soil, the measurement of the parameters is a first prerequisite.
The Time Domain Reflectometry (TDR) can measure the dielectric constant and the electrical impedance of a soil body by utilizing a standing wave technology, and can be used for measuring the volume water content and the pore solution concentration in the soil; in the prior art, a plurality of methods can accurately measure the parameters, and a few of the methods use a time domain reflectometry method, but the problems that the test method is complex, the measurement of each parameter is time-consuming, the measurement method of some parameters is destructive to the soil body and the like still exist.
Disclosure of Invention
The invention provides a method and a device for measuring suction force of a polluted soil body and concentration of a pore solution, and aims to solve the problems that the test flow for measuring the suction force in the soil and the concentration of the pore solution by the existing method is complex and destructive to the soil body.
In order to achieve the above object, an embodiment of the present invention provides a method for measuring a suction force of a contaminated soil body and a concentration of a pore solution, including:
preparing a standard sample, uniformly mixing a preset amount of chemical solutions with different concentrations with the sample, respectively preparing a plurality of standard samples within a preset volume water content range, and sending the standard samples into a measuring device;
step two, carrying out a calibration test, and testing the dielectric constant epsilon and the electrical impedance Z of the standard sampleLCalculating the conductivity value sigma of the sample by combining the electrical impedance of the standard samplesTesting the actually measured water content theta and the conductivity value sigma of the pore solution of the standard samplew；
Step three, calibrating a fitting curve, fitting the dielectric constant epsilon with the actually measured water content theta of the standard sample to obtain an epsilon-theta calibration fitting curve, and obtaining the conductivity value of the sampleσsAnd the measured conductivity value sigma of the pore liquidwLinear fitting is carried out to obtain sigmas-σwCalibrating a fitting curve;
preparing a sample, controlling the suction force of the sample, preparing the sample for measurement, sending the sample into a measuring device, and controlling the suction force of the sample by using a testing device until the interior of a sample soil body is balanced;
step five, recording and analyzing data, reading and recording test data to obtain epsilon and sigmasMeasured value using epsilon-theta and sigmas-σwCalibrating a fitting curve to calculate the volume water content theta and the pore solution conductivity sigma corresponding to the samplew；
Step six, calculating the suction force of the sample and the concentration of the pore solution, and according to the concentration C of the pore solution and the conductivity sigma of the pore solutionwCalculating the concentration C of the pore solution according to the corresponding relation; calculating the total suction force of the sample by combining the volume water content theta of the sample and the soil-water characteristic curve of the sample
Substrate suction
And osmotic attraction pi.
In the first step, KCl solution with 3 concentrations (0.01mol/L, 0.03mol/L and 0.05mol/L) can be adopted to be uniformly mixed with the soil sample and then compacted to prepare a plurality of test standard samples, and the volume water content of the standard samples is kept between 0.3 and 0.6.
Wherein, in the second step, the dielectric constant epsilon and the electrical impedance Z of the sample are tested by the TDR probeLCalculating the conductivity sigma of the sample by combining the electrical impedance of the standard sample through an empirical formulasTesting the actually measured water content theta of the standard sample by a drying method, and actually measuring the conductivity sigma of the pore solution in the soil by a conductivity meterw。
Wherein, in the fourth step, the suction force of the sample is controlled by adopting a dialysis method or a gas phase method; when the dialysis method is adopted to control the suction force of the sample, a test device is utilized to pump a test solution to the sample; when the gas phase method is adopted to control the suction force of the sample, the test device is utilized to introduce gas with a preset suction force value into the sample.
Wherein, 0.005mol/L-0.05mol/L KCl solution and CaCl can be used for pumping the test solution to the sample2Solution or COD/BOD solution of 500 mg/L; available K for introducing gas with preset suction value into sample2SO4、ZnSO4、NaCl、K2CO3Or a saturated salt solution of LiCl controls gases with different values of suction.
The embodiment of the invention also provides a device for measuring the suction force of the polluted soil body and the concentration of the pore solution, which comprises: the device comprises a top cover, a soil column chamber, a base, a chemical solution circulating system, a gas circulating system and a data acquisition system;
the top cover is arranged at the upper end of the earth column cavity, the base is arranged at the lower end of the earth column cavity, the top cover, the earth column cavity and the base are matched to form a closed space, and the closed space is used for placing a sample; the top cover is provided with a gas inlet and a gas outlet, the gas circulation system is communicated with the interior of the soil column cavity through the gas inlet and the gas outlet, and the gas circulation system is used for providing gases with different suction values for the interior of the soil column cavity; the base is provided with a solution inlet and a solution outlet, the chemical solution circulating system is communicated with the interior of the soil column cavity through the solution inlet and the solution outlet, and the chemical solution circulating system is used for providing different test solutions to the interior of the soil column cavity; a plurality of prefabricated holes are evenly formed in the outer wall of the soil column cavity, the data acquisition system is provided with a plurality of TDR probes, the TDR probes are buried in the sample through the prefabricated holes, and the data acquisition system is used for testing various parameters of the sample.
The bottom of the top cover is provided with a circular boss, the gas outlet and the gas inlet are communicated from the top surface of the top cover to the bottom surface of the circular boss, the diameter of the circular boss is the same as the inner diameter of the soil column cavity, and the circular boss is tightly inserted into the soil column cavity; the base is a vertically arranged bowl-shaped structure, the inner diameter of a groove of the base is the same as the outer diameter of the soil column cavity, the soil column cavity is tightly inserted into the base, and the solution inlet and the solution outlet are communicated from the bottom surface of the base to the bottom surface of the groove of the base.
Wherein, all be provided with the permeable stone between sample and circular boss and the base, still be provided with the pellicle between sample and the base.
The chemical solution circulating system is provided with a solution bottle and a peristaltic pump, the test solution is placed in the solution bottle, a solution input peristaltic tube and a solution output peristaltic tube are arranged in the solution bottle, a tube orifice at one end of the solution input peristaltic tube is arranged on the liquid level of the test solution, a tube orifice at the other end of the solution input peristaltic tube is used for being connected with the solution outlet, a tube orifice at one end of the solution output peristaltic tube is arranged below the liquid level of the test solution, a valve is arranged at a tube orifice at the other end of the solution output peristaltic tube and used for communicating with the solution inlet, and the peristaltic pump is arranged in the middle of the solution output peristaltic tube and used for providing solution circulating power.
Wherein, gas circulation system is provided with drying dish and pneumatic pump, be provided with the saturated salt solution in the drying dish, inside gas output tube and the gas input pipe of being provided with of drying dish, the drying dish integral seal passes through gas output tube and gas input pipe and external intercommunication, the one end of gas output tube is passed the outer wall setting of drying dish is in on the liquid level of saturated salt solution, the other end switch-on of gas output tube gas inlet, the one end switch-on of gas input tube gas outlet, the other end of gas input tube passes the outer wall setting of drying dish is in under the liquid level of saturated salt solution, the middle part of gas input tube is inserted the pneumatic pump is used for providing gas dynamic.
The scheme of the invention has the following beneficial effects:
(1) the invention adopts a Time Domain Reflectometry (TDR) method to measure the volume water content of the soil body and the conductivity of the pore solution, and can realize the joint measurement of the suction force in the soil and the concentration of the pore solution according to the corresponding relation between the soil-water characteristic curve and the conductivity of the pore solution and the concentration of the pore solution, thereby simplifying the measuring process;
(2) the device comprises a chemical solution circulating system and a gas circulating system, and can accurately control the suction in the soil by a dialysis method and a gas phase method, and can measure the corresponding matrix suction and osmotic suction of different chemically polluted soil bodies under different water contents;
(3) the invention adopts TDR technology to measure the water content of the soil body and the concentration of the pore solution, and has the advantages of high precision, high speed, no damage, automatic monitoring and the like.
Drawings
FIG. 1 is a simplified schematic view of the process of the device for measuring the suction force of the contaminated soil and the concentration of the pore solution according to the present invention;
FIG. 2 is a schematic diagram of the main structure of the method for measuring the suction force of the contaminated soil and the concentration of the pore solution according to the present invention;
FIG. 3 is a schematic view of a chemical solution circulation system of the contaminated soil suction and pore solution concentration measuring apparatus according to the present invention;
FIG. 4 is a schematic view of the gas circulation system of the device for measuring the suction force of the contaminated soil and the concentration of the pore solution according to the present invention.
[ description of reference ]
1-a top cover; 2-a soil column chamber; 3-a base; 4-a chemical solution circulation system; 5-a gas circulation system; 6-a data acquisition system; 7-sample; 8-permeable stone; 9-a semi-permeable membrane; 11-gas inlet; 12-a gas outlet; 13-circular boss; 21-prefabricating holes; 31-solution inlet; 32-a solution outlet; 41-test solution; 42-solution bottle; 43-peristaltic pump; 44-solution input peristaltic tubing; 45-solution output peristaltic tube; 46-a valve; 51-drying dish; 52-a pneumatic pump; 53-saturated salt solution; 54-gas outlet pipe; 55-gas input pipe; 61-TDR probe.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a method for measuring the suction force of a polluted soil body and the concentration of a pore solution, aiming at the problems that the test flow is complex and the soil body is destructive in the existing method for measuring the suction force in the soil and the concentration of the pore solution.
Example 1:
as shown in fig. 1, an embodiment of the present invention provides a method for measuring a suction force of a contaminated soil body and a concentration of a pore solution, including:
preparing a standard sample, uniformly mixing a preset amount of chemical solutions with different concentrations with the sample, respectively preparing a plurality of standard samples within a preset volume water content range, and sending the standard samples into a measuring device;
step two, carrying out a calibration test, and testing the dielectric constant epsilon and the electrical impedance Z of the standard sampleLCalculating the conductivity value sigma of the sample by combining the electrical impedance of the standard samplesTesting the actually measured water content theta and the conductivity value sigma of the pore solution of the standard samplew；
Step three, calibrating a fitting curve, fitting the dielectric constant epsilon with the actually measured water content theta of the standard sample to obtain an epsilon-theta calibration fitting curve, and obtaining the conductivity value sigma of the samplesAnd the measured conductivity value sigma of the pore liquidwLinear fitting is carried out to obtain sigmas-σwCalibrating a fitting curve;
preparing a sample, controlling the suction force of the sample, preparing the sample for measurement, sending the sample into a measuring device, and controlling the suction force of the sample by using a testing device until the interior of a sample soil body is balanced;
step five, recording and analyzing data, reading and recording test data to obtain epsilon and sigmasMeasured value using epsilon-theta and sigmas-σwCalibrating a fitting curve to calculate the volume water content theta and the pore solution conductivity sigma corresponding to the samplew；
Step six, calculating the suction force of the sample and the concentration of the pore solution, and according to the concentration C of the pore solution and the conductivity sigma of the pore solutionwCalculating the concentration C of the pore solution according to the corresponding relation; calculating the total suction force of the sample by combining the volume water content theta of the sample and the soil-water characteristic curve of the sample
Substrate suckerForce of
And osmotic attraction pi.
The method for measuring the suction force of the polluted soil body and the concentration of the pore solution can measure the volume water content of the soil body and the conductivity of the pore solution, and can realize the joint measurement of the suction force in the soil and the concentration of the pore solution according to the corresponding relation between the soil-water characteristic curve and the conductivity of the pore solution and the concentration of the pore solution, thereby simplifying the flow of measuring the suction force and the concentration of the pore solution and shortening the test time.
In the first step, KCl solution with 3 concentrations (0.01mol/L, 0.03mol/L and 0.05mol/L) is uniformly mixed with a soil sample and then compacted to prepare a plurality of test standard samples, and the volume water content of the standard samples is kept between 0.3 and 0.6.
According to the method for measuring the suction force of the polluted soil body and the concentration of the pore solution, the KCl solution and the soil sample are preferably uniformly mixed and then compacted to be made into eight or more than eight test standard samples, so that the test parameters are more accurately measured.
Wherein, in the second step, the dielectric constant epsilon and the electrical impedance Z of the sample are tested by the TDR probeLCalculating the conductivity sigma of the sample by combining the electrical impedance of the standard sample through an empirical formulasTesting the actually measured water content theta of the standard sample by a drying method, and actually measuring the conductivity sigma of the pore solution in the soil by a conductivity meterw。
Wherein, in the fourth step, the suction force of the sample is controlled by adopting a dialysis method or a gas phase method; when the dialysis method is adopted to control the suction force of the sample, a test device is utilized to pump a test solution to the sample; when the gas phase method is adopted to control the suction force of the sample, the test device is utilized to introduce gas with a preset suction force value into the sample.
Wherein, 0.005mol/L-0.05mol/L KCl solution and CaCl can be used for pumping the test solution to the sample2Solution or COD/BOD solution of 500 mg/L; available K for introducing gas with preset suction value into sample2SO4、ZnSO4、NaCl、K2CO3Or saturation of LiClAnd saline solution to control the gas with different suction values.
The method for measuring the suction force of the polluted soil body and the concentration of the pore solution, K, of the embodiment of the invention2SO4、ZnSO4、NaCl、K2CO3Or a saturated salt solution of LiCl can be used to control the gases at 4.2MPa, 12.6MPa, 38MPa, 110MPa and 309MPa, respectively.
Example 2:
as shown in fig. 2, 3 and 4, an embodiment of the present invention provides an apparatus for measuring a contaminated soil suction force and a pore solution concentration, including: the device comprises a top cover 1, a soil column chamber 2, a base 3, a chemical solution circulating system 4, a gas circulating system 5 and a data collecting system 6; the top cover 1 is arranged at the upper end of the earth column cavity 2, the base 3 is arranged at the lower end of the earth column cavity 2, the top cover 1, the earth column cavity 2 and the base 3 are matched to form a closed space, and the closed space is used for placing a sample 7; the top cover 1 is provided with a gas inlet 11 and a gas outlet 12, the gas circulation system 5 is communicated with the interior of the soil column cavity 2 through the gas inlet 11 and the gas outlet 12, and the gas circulation system 5 is used for providing gases with different suction values to the interior of the soil column cavity 2; the base 3 is provided with a solution inlet 31 and a solution outlet 32, the chemical solution circulating system 4 is communicated with the interior of the soil column chamber 2 through the solution inlet 31 and the solution outlet 32, and the chemical solution circulating system 4 is used for providing different test solutions 41 to the interior of the soil column chamber 2; a plurality of prefabricated holes 21 have evenly been seted up to the outer wall of earth pillar cavity 2, data acquisition system 6 is provided with a plurality of TDR probes 61, TDR probe 61 passes through prefabricated hole 21 is buried underground in sample 7, data acquisition system 6 is used for the test each item parameter of sample 7.
In the device for measuring the suction force of the contaminated soil and the concentration of the pore solution according to the above embodiment of the present invention, the top cover 1, the soil column chamber 2, and the base 3 are configured to hold the sample 7, when the suction force of the sample 7 needs to be controlled by a dialysis method, the chemical solution circulation system 4 is connected to the solution inlet 31 and the solution outlet 32, when the suction force of the sample 7 needs to be controlled by a gas phase method, the gas circulation system 5 is connected to the gas inlet 11 and the gas outlet 12, and when the suction force of the sample is controlled until the interior of the sample reaches an equilibrium state, corresponding test data is read and recorded by the data acquisition system 6, so that the measurement of the suction force of the contaminated soil and the concentration of the pore solution is completed in a.
The bottom of the top cover 1 is provided with a circular boss 13, the gas outlet 12 and the gas inlet 11 are communicated from the top surface of the top cover 1 to the bottom surface of the circular boss 13, the diameter of the circular boss 13 is the same as the inner diameter of the soil column cavity 2, and the circular boss 13 is tightly inserted into the soil column cavity 2; the base 3 is a vertically arranged bowl-shaped structure, the inner diameter of a groove of the base 3 is the same as the outer diameter of the soil column chamber 2, the soil column chamber 2 is tightly inserted into the base 3, and the solution inlet 31 and the solution outlet 32 are communicated from the bottom surface of the base 3 to the bottom surface of the groove of the base 3.
According to the device for measuring the suction force of the polluted soil body and the concentration of the pore solution, in the embodiment of the invention, the top cover 1 is inserted into the upper end opening of the soil column cavity 2 through the circular boss 13, the base 3 is sleeved outside the lower end opening of the soil column cavity 2 through the groove of the base 3 above, and as the diameter of the circular boss 13 is the same as the inner diameter of the soil column cavity 2 and the inner diameter of the groove of the base 3 is the same as the outer diameter of the soil column cavity 2, the top cover 1, the soil column cavity 2 and the base 3 form a sealed cavity with air tightness and water seepage prevention; when gas or solution is introduced, it enters from the top and bottom of the sample 7.
Wherein, all be provided with permeable stone 8 between sample 7 and circular boss 13 and the base 3, still be provided with pellicle 9 between sample 7 and the base 3.
In the device for measuring the suction force and the pore solution concentration of the contaminated soil body according to the above embodiment of the present invention, the semipermeable membrane 9 is wrapped on a portion of the permeable stone 8 at the bottom, the pore solution in the sample 7 and the solvent (water) in the chemical solution can freely pass through the semipermeable membrane 9, solute molecules (salt, heavy metal ions, PEG, etc.) cannot pass through the semipermeable membrane 9, and an osmotic suction force gradient exists between the sample 7 and the external chemical solution to control the suction force in the sample 7.
The chemical solution circulation system 4 is provided with a solution bottle 42 and a peristaltic pump 43, the test solution 41 is placed in the solution bottle 42, a solution input peristaltic tube 44 and a solution output peristaltic tube 45 are arranged in the solution bottle 42, a nozzle at one end of the solution input peristaltic tube 44 is arranged on the liquid level of the test solution 41, a nozzle at the other end of the solution input peristaltic tube 44 is used for connecting the solution outlet 32, a nozzle at one end of the solution output peristaltic tube 45 is arranged below the liquid level of the test solution 41, a nozzle at the other end of the solution output peristaltic tube 45 is provided with a valve 46 and is used for communicating with the solution inlet 31, and the peristaltic pump 43 is arranged in the middle of the solution output peristaltic tube 45 and is used for providing solution circulation power.
In the device for measuring the suction force of the contaminated soil and the concentration of the pore solution according to the above embodiment of the present invention, the test solution 41 is driven by the peristaltic pump 43, and the solution bottle 42 flows out of the solution output peristaltic tube 45 and flows into the solution inlet 31, so that the solvent permeates into the sample 7, and the excess solvent of the test solution 41 flows from the solution outlet 32 to the solution input peristaltic tube 44 after the sample 7 is saturated and then returns to the solution bottle 42; the test solution 41 can adopt 0.005mol/L-0.05mol/L KCl solution, CaCl2Solution or COD/BOD solution of 500 mg/L.
The gas circulation system 5 is provided with a drying dish 51 and a pneumatic pump 52, a saturated salt solution 53 is arranged in the drying dish 51, a gas output pipe 54 and a gas input pipe 55 are arranged in the drying dish 51, the drying dish 51 is integrally sealed and communicated with the outside through the gas output pipe 54 and the gas input pipe 55, one end of the gas output pipe 54 penetrates through the outer wall of the drying dish 51 and is arranged above the liquid level of the saturated salt solution 53, the other end of the gas output pipe 54 is communicated with the gas inlet 11, one end of the gas input pipe 55 is communicated with the gas outlet 12, the other end of the gas input pipe 55 penetrates through the outer wall of the drying dish 51 and is arranged below the liquid level of the saturated salt solution 53, and the middle part of the gas input pipe 55 is connected to the pneumatic pump 52 and is used for providing pneumatic power.
In the device for measuring the suction force of the contaminated soil body and the concentration of the pore solution according to the above embodiment of the present invention, the saturated salt solution 53 is disposed in the drying dish 51, the speed of the pneumatic pump 52 is adjustable, and the gas pumped by the pneumatic pump 52 passes through the saturated salt solution 53 and becomes a gas with a fixed suction force, such as: k2SO4、ZnSO4、NaCl、K2CO3Or LiCl, can be used to control the 4.2MPa, 12.6MPa, 38MPa, 110MPa, and 309MPa gases, respectively.
Example 3:
in the embodiment 3 of the invention, the suction force in soil is controlled by a dialysis method, and the specific test flow and method are as follows:
(1) first, calibration tests for water content and pore solution conductivity were performed on the TDR system.
KCl solution with 3 concentrations (0.01mol/L, 0.03mol/L and 0.05mol/L) is uniformly mixed with a soil sample and then compacted to prepare 8 standard samples (the number of the standard samples can be more than 8), and the volume water content of the standard samples is kept between 0.3 and 0.6. The standard sample is loaded into a soil column cavity 2 of the test device, the TDR probe 61 is inserted into a specified position in soil, and a TDR system is used for testing the dielectric constant epsilon and the electrical impedance Z of the standard sampleL. Calculating the soil body conductivity sigma by combining the electrical impedance of the standard sample through an empirical formulas. Taking out partial soil samples from each standard sample, actually measuring the water content theta of the soil samples by a drying method, and actually measuring the conductivity sigma of the pore solution in the soil by a conductivity meterw. And (3) performing function fitting (referring to a Topp empirical formula) on the dielectric constant epsilon of the soil body measured by the TDR system and the measured water content theta of the soil body to obtain an epsilon-theta calibration fitting curve. Soil body conductivity sigmasConductivity σ to pore fluidwHas a linear relation with the soil body volume water content theta, and the soil body conductivity sigma measured by TDRsConductivity sigma of measured pore liquidwLinear fitting is carried out to obtain sigmas-σwAnd calibrating the fitting curve. In solution of known porosityUnder the premise of medium solute type, the concentration C of the pore solution and the conductivity sigma of the pore solutionwHas a one-to-one correspondence relationship according to sigmawC is calculated.
(2) The device of the present invention is assembled as shown in fig. 1 and 3, the solution input peristaltic tube 44 and the solution output peristaltic tube 45 in the chemical solution circulation system 4 are respectively communicated with the solution outlet 32 and the solution inlet 31 at the bottom end of the base 3, and the device tightness is checked. Preparing the test solution 41 for testing, pressing the test sample 7 or preparing an original sample, loading the test sample or the original sample into the soil column cavity 2 of the device, and inserting the TDR probe 61 into the specified position of the test sample 7 to complete the early preparation work.
(3) Starting the peristaltic pump 43, opening the valve 46, and pumping the test solution 41 (e.g. 0.005-0.05mol/L KCl solution, CaCl) into the soil sample chamber 2 from the chemical solution circulation system 42Solution or 500mg/L COD/BOD solution), and controlling the suction force of the soil body by adopting a dialysis method.
(4) After a period of time, when the moisture exchange between the sample 7 and the external test solution 41 reaches an equilibrium state, the valve 46 is closed, the introduction of the test solution 41 is stopped, and the data acquisition system 6 reads and records test data to obtain epsilon and sigmasAnd (d) measuring the value. Utilizing the epsilon-theta and sigma obtained by the calibration test in the step (1)s-σwCalibrating a fitting curve to calculate the volume water content theta and the pore solution conductivity sigma corresponding to the samplew. According to the concentration C and conductivity sigma of the pore solutionwAnd C is calculated according to the corresponding relation. (for example, when the solute in the pore solution in the soil is KCl, referring to Weast (1965) formula, the relationship between the concentration of the pore solution and the conductivity is that C is-0.7 × 10 ═ C-4+7.6×10-2σW)
(5) Calculating the total suction force of the sample by combining the soil water characteristic curve of the sample according to the volume water content theta of the soil body obtained in the step (4)
Substrate suction
And osmotic attraction pi.
(6) Obtaining the substrate suction force of the sample under different water contents by using the test solution 41 of different kinds and concentrations corresponding to different suction force values
And osmotic attraction pi.
Example 4:
in the embodiment 4 of the invention, the suction force in soil is controlled by adopting a gas phase method, and the specific test flow and the method are as follows:
(1) first, calibration tests for water content and pore solution conductivity were performed on the TDR system. The concrete method refers to the step (1) of example 3.
(2) As shown in fig. 1 and 4, the device of the present invention was assembled, and the gas outlet pipe 54 and the gas inlet pipe 55 of the gas circulation system 5 were connected to the gas inlet 11 and the gas outlet 12 of the top cover 1, respectively, to check the sealing performance of the device. Preparing the saturated saline solution 53 corresponding to the dry gas at different suction points, pressing the sample 7 or preparing an undisturbed sample, loading the sample 7 or the undisturbed sample into the soil column cavity 2, and inserting the TDR probe 61 into the designated position of the sample 7 to complete the early preparation work.
(3) The pneumatic pump 52 is turned on, and gas with a preset suction value (such as saturated salt solution K) is introduced into the soil column chamber 2 from the gas circulation system 52SO4、ZnSO4、NaCl、K2CO3And LiCl respectively at 4.2MPa, 12.6MPa, 38MPa, 110MPa and 309 MPa), and controlling the total suction force of the soil body by adopting a gas phase method.
(4) After a period of time, when the interior of the soil body of the sample 7 reaches an equilibrium state, the pneumatic pump 52 is turned off, the gas supply is stopped, and the data acquisition system 6 reads and records the test data to obtain epsilon and sigmasAnd (d) measuring the value. The epsilon-theta and sigma obtained by the calibration test in the step (1) are utilizeds-σwCalibrating a fitting curve to calculate the volume water content theta and the pore solution conductivity sigma corresponding to the samplew. According to the pore solution concentration C andpore solution conductivity σwAnd C is calculated according to the corresponding relation. (e.g., when the solute in the pore solution is CaCl)2Then, referring to the formula of Weast (1965), C ═ 1.2X 10-3+9.4×10-2σW)
(5) Calculating the total suction force of the sample by combining the soil water characteristic curve of the sample according to the volume water content theta of the soil body obtained in the step (4)
Substrate suction
And osmotic attraction pi.
(6) Introducing gas with different suction values to obtain the substrate suction force of the test sample 7 under different water contents
And osmotic attraction pi.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. A method for measuring the suction force of a polluted soil body and the concentration of a pore solution is characterized by comprising the following steps:
preparing a standard sample, uniformly mixing a preset amount of chemical solutions with different concentrations with the sample, respectively preparing a plurality of standard samples within a preset volume water content range, and sending the standard samples into a measuring device;
step two, carrying out a calibration test, and testing the dielectric constant epsilon and the electrical impedance Z of the standard sampleLCalculating the conductivity value sigma of the sample by combining the electrical impedance of the standard samplesTesting the actually measured water content theta and the conductivity value sigma of the pore solution of the standard samplew；
Step three, calibrating a fitting curve, and actually measuring the dielectric constant epsilon and the standard sampleFitting the water content theta to obtain an epsilon-theta calibration fitting curve and a sample conductivity value sigmasAnd the measured conductivity value sigma of the pore liquidwLinear fitting is carried out to obtain sigmas-σwCalibrating a fitting curve;
preparing a sample, controlling the suction force of the sample, preparing the sample for measurement, sending the sample into a measuring device, and controlling the suction force of the sample by using a testing device until the interior of a sample soil body is balanced;
step five, recording and analyzing data, reading and recording test data to obtain epsilon and sigmasMeasured value using epsilon-theta and sigmas-σwCalibrating a fitting curve to calculate the volume water content theta and the pore solution conductivity sigma corresponding to the samplew；
Step six, calculating the suction force of the sample and the concentration of the pore solution, and according to the concentration C of the pore solution and the conductivity sigma of the pore solutionwCalculating the concentration C of the pore solution according to the corresponding relation; calculating the total suction force of the sample by combining the volume water content theta of the sample and the soil-water characteristic curve of the sample
Substrate suction
And osmotic attraction pi.
2. The method for measuring the suction force of the polluted soil body and the concentration of the pore solution according to the claim 1, wherein in the step one, a KCl solution with the concentration of 0.01mol/L, 0.03mol/L or 0.05mol/L is adopted, is uniformly mixed with a soil sample and is compacted to form a plurality of test standard samples, and the volume water content of the standard samples is kept between 0.3 and 0.6.
3. The method of claim 1, wherein in step two, the dielectric constant epsilon and the electrical impedance Z of the sample are measured by a TDR probeLCalculating the electric impedance of the sample by combining the electric impedance of the standard sample through an empirical formulaConductivity sigmasTesting the actually measured water content theta of the standard sample by a drying method, and actually measuring the conductivity sigma of the pore solution in the soil by a conductivity meterw。
4. The method for measuring the suction force of the polluted soil body and the concentration of the pore solution according to claim 1, wherein in the fourth step, the suction force of the sample is controlled by a dialysis method or a gas phase method; when the dialysis method is adopted to control the suction force of the sample, a test device is utilized to pump a test solution to the sample; when the gas phase method is adopted to control the suction force of the sample, the test device is utilized to introduce gas with a preset suction force value into the sample.
5. The method of claim 4, wherein the KCl solution and CaCl solution are used in an amount of 0.005mol/L-0.05mol/L for pumping the test solution into the sample2Solution or COD/BOD solution of 500 mg/L; gas with preset suction value is introduced into sample for utilization K2SO4、ZnSO4、NaCl、K2CO3Or a saturated salt solution of LiCl controls gases with different values of suction.
6. The method according to any one of claims 1 to 5, wherein the method is performed by a contaminated soil suction and pore solution concentration measuring apparatus, and the contaminated soil suction and pore solution concentration measuring apparatus comprises: the device comprises a top cover, a soil column chamber, a base, a chemical solution circulating system, a gas circulating system and a data acquisition system;
the top cover is arranged at the upper end of the earth column cavity, the base is arranged at the lower end of the earth column cavity, the top cover, the earth column cavity and the base are matched to form a closed space, and the closed space is used for placing a sample; the top cover is provided with a gas inlet and a gas outlet, the gas circulation system is communicated with the interior of the soil column cavity through the gas inlet and the gas outlet, and the gas circulation system is used for providing gases with different suction values for the interior of the soil column cavity; the base is provided with a solution inlet and a solution outlet, the chemical solution circulating system is communicated with the interior of the soil column cavity through the solution inlet and the solution outlet, and the chemical solution circulating system is used for providing different test solutions to the interior of the soil column cavity; the outer wall of the soil column cavity is uniformly provided with a plurality of prefabricated holes, the data acquisition system is provided with a plurality of TDR probes, the TDR probes are embedded in the sample through the prefabricated holes, and the data acquisition system is used for testing various parameters of the sample;
a circular boss is arranged at the bottom of the top cover, the gas outlet and the gas inlet are communicated from the top surface of the top cover to the bottom surface of the circular boss, the diameter of the circular boss is the same as the inner diameter of the soil column cavity, and the circular boss is tightly inserted into the soil column cavity; the base is a vertically arranged bowl-shaped structure, the inner diameter of a groove of the base is the same as the outer diameter of the soil column cavity, the soil column cavity is tightly inserted into the base, and the solution inlet and the solution outlet are communicated from the bottom surface of the base to the bottom surface of the groove of the base;
permeable stones are arranged among the sample, the circular boss and the base, and a semi-permeable membrane is arranged between the sample and the base;
the chemical solution circulating system is provided with a solution bottle and a peristaltic pump, the test solution is placed in the solution bottle, a solution input peristaltic tube and a solution output peristaltic tube are arranged in the solution bottle, a tube orifice at one end of the solution input peristaltic tube is arranged on the liquid level of the test solution, a tube orifice at the other end of the solution input peristaltic tube is used for connecting the solution outlet, a tube orifice at one end of the solution output peristaltic tube is arranged below the liquid level of the test solution, a valve is arranged at a tube orifice at the other end of the solution output peristaltic tube and is used for communicating with the solution inlet, and the peristaltic pump is arranged in the middle of the solution output peristaltic tube and is used for providing solution circulating power;
gas circulation system is provided with drying dish and pneumatic pump, be provided with the saturated salt solution in the drying dish, inside gas output tube and the gas input pipe of being provided with of drying dish, the drying dish integral seal passes through gas output tube and gas input pipe and external intercommunication, the one end of gas output tube is passed the outer wall setting of drying dish is in on the liquid level of saturated salt solution, the other end switch-on of gas output tube gas inlet, the one end switch-on of gas input tube gas outlet, the other end of gas input tube passes the outer wall setting of drying dish is in under the liquid level of saturated salt solution, the middle part of gas input tube inserts the pneumatic pump is used for providing gas power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010330695.5A CN111487297B (en) | 2020-04-24 | 2020-04-24 | Method and device for measuring suction force of polluted soil body and concentration of pore solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010330695.5A CN111487297B (en) | 2020-04-24 | 2020-04-24 | Method and device for measuring suction force of polluted soil body and concentration of pore solution |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111487297A CN111487297A (en) | 2020-08-04 |
| CN111487297B true CN111487297B (en) | 2021-03-30 |
Family
ID=71795167
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010330695.5A Expired - Fee Related CN111487297B (en) | 2020-04-24 | 2020-04-24 | Method and device for measuring suction force of polluted soil body and concentration of pore solution |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111487297B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114019007B (en) * | 2021-11-04 | 2024-01-12 | 中国能源建设集团江苏省电力设计院有限公司 | Organic pollutant concentration measuring system and method |
| CN116990357B (en) * | 2023-09-28 | 2023-12-12 | 湖南省交通规划勘察设计院有限公司 | Soil property in-situ test system and method based on dielectric constant |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5646537A (en) * | 1992-03-23 | 1997-07-08 | Soilmoisture Equipment Corp. | Antenna-probe measuring moisture in soil and other mediums |
| CN101738360A (en) * | 2009-10-16 | 2010-06-16 | 同济大学 | Time domain reflection unsaturated permeameter and method for measuring unsaturated permeability coefficient |
| CN203287297U (en) * | 2013-05-29 | 2013-11-13 | 浙江大学 | Test device for soil-water characteristic curve and permeability coefficient of unsaturated coarse grained soil |
| CN103837662A (en) * | 2014-01-17 | 2014-06-04 | 哈尔滨工业大学深圳研究生院 | Measuring device and method of hydraulic characteristic parameters of unsaturated soil in moisture absorption/desorption path |
| CN106198650A (en) * | 2016-07-04 | 2016-12-07 | 中国环境科学研究院 | A kind of assay method of debirs material moisture |
| CN106324045A (en) * | 2016-11-01 | 2017-01-11 | 西安理工大学 | Device for testing electric conductivity and soil-water characteristics of loess |
| CN107966476A (en) * | 2017-11-16 | 2018-04-27 | 太原理工大学 | A kind of chaos Time Domain Reflectometry soil water meauring device and method |
| CN109211687A (en) * | 2018-09-18 | 2019-01-15 | 同济大学 | Full-automatic direct shear apparatus for high-pressure solid bentonite unsaturation shear property research |
| CN110196255A (en) * | 2019-06-06 | 2019-09-03 | 长沙理工大学 | The pressure plate apparatus and its measurement method of rapid survey soil-water characteristic curve |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090273352A1 (en) * | 2008-04-30 | 2009-11-05 | Xiong Yu | Sensor apparatus and system for time domain reflectometry |
-
2020
- 2020-04-24 CN CN202010330695.5A patent/CN111487297B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5646537A (en) * | 1992-03-23 | 1997-07-08 | Soilmoisture Equipment Corp. | Antenna-probe measuring moisture in soil and other mediums |
| CN101738360A (en) * | 2009-10-16 | 2010-06-16 | 同济大学 | Time domain reflection unsaturated permeameter and method for measuring unsaturated permeability coefficient |
| CN203287297U (en) * | 2013-05-29 | 2013-11-13 | 浙江大学 | Test device for soil-water characteristic curve and permeability coefficient of unsaturated coarse grained soil |
| CN103837662A (en) * | 2014-01-17 | 2014-06-04 | 哈尔滨工业大学深圳研究生院 | Measuring device and method of hydraulic characteristic parameters of unsaturated soil in moisture absorption/desorption path |
| CN106198650A (en) * | 2016-07-04 | 2016-12-07 | 中国环境科学研究院 | A kind of assay method of debirs material moisture |
| CN106324045A (en) * | 2016-11-01 | 2017-01-11 | 西安理工大学 | Device for testing electric conductivity and soil-water characteristics of loess |
| CN107966476A (en) * | 2017-11-16 | 2018-04-27 | 太原理工大学 | A kind of chaos Time Domain Reflectometry soil water meauring device and method |
| CN109211687A (en) * | 2018-09-18 | 2019-01-15 | 同济大学 | Full-automatic direct shear apparatus for high-pressure solid bentonite unsaturation shear property research |
| CN110196255A (en) * | 2019-06-06 | 2019-09-03 | 长沙理工大学 | The pressure plate apparatus and its measurement method of rapid survey soil-water characteristic curve |
Non-Patent Citations (2)
| Title |
|---|
| 基于渗透吸力的侵蚀黏土强度模型;郭慧英 等;《黑龙江科技大学学报》;20160731;第26卷(第4期);422-428 * |
| 环境岩土工程研究进展;刘松玉 等;《土木工程学报》;20160331;第49卷(第3期);6-30 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111487297A (en) | 2020-08-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104964878B (en) | The triaxial test system and method for unsaturated soil multi- scenarios method | |
| Lewis et al. | Optimizing the experimental design of soil columns in saturated and unsaturated transport experiments | |
| CN105910971B (en) | The simultaneous measuring method of rich organic matter compact rock core gas permeability and diffusion coefficient | |
| CN102706728B (en) | Multifunctional unsaturated soil triaxial test device capable of circularly applying suction and method thereof | |
| CN111487297B (en) | Method and device for measuring suction force of polluted soil body and concentration of pore solution | |
| DK1982047T3 (en) | VADOSE ZONE PROBE, PROCEDURE AND SYSTEM FOR MONITORING OF SOIL PROPERTIES | |
| CN204789158U (en) | Triaxial test device of many field couplings of unsaturated soil | |
| CN111650107B (en) | Multifunctional soil body infiltration and dirt intercepting capability test device | |
| CN102536222A (en) | Analog evaluation device for evaluating damage of coalbed methane reservoir polluted by external fluid | |
| WO2023240817A1 (en) | Device and method for continuously testing gas permeability coefficient of unsaturated soil under variable suction | |
| CN111337542B (en) | Method and device for monitoring osmotic absorption force in heavy metal polluted site by time domain reflection method | |
| Dane et al. | 3.3. 2 Laboratory | |
| CN110686952A (en) | Method for quickly establishing pressure storage layer of full-diameter rock core of tight gas reservoir | |
| CN114062657B (en) | Rock-soil body dry-wet circulation test system and method in unsaturated state | |
| CN210720067U (en) | Rotatable serial-type earth pillar test device | |
| CN207423761U (en) | The indoor soil-column experimental provision infiltrated for Dripping simulation | |
| CN210604631U (en) | Indoor tester for high water content dredged soil under low stress and negative pressure state | |
| CN110187059B (en) | In-situ column experiment simulation system and simulation method for underground water well | |
| CN109839494B (en) | Test device capable of measuring size of capillary gas-phase seepage influence area | |
| CN109612902B (en) | System and method for simulating groundwater level fluctuation with controllable temperature and dissolved oxygen | |
| WO2023124090A1 (en) | Pollutant migration soil column apparatus used for plastic concrete, and test method thereof | |
| CN206223616U (en) | A kind of chemical solution infiltration leaching device for adapting to three axle samples | |
| CN207472845U (en) | The experimental provision of saturated aqueous layer chlorinated hydrocarbon DNAPL pollution sources is repaired based on Zero-valent Iron-PRB reduction | |
| CN202710440U (en) | Performance test device of cohesive soil specimen | |
| CN215678199U (en) | Water lock injury testing device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210330 |