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Polluted soil body suction and pore solution concentration measuring method and device

A technology of solution concentration and determination method, applied in measurement devices, analysis of suspensions and porous materials, surface/boundary effects, etc. High precision, fast speed, and the effect of simplifying the measurement process

Active Publication Date: 2020-08-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method and device for measuring the suction force and pore solution concentration of polluted soil, the purpose of which is to avoid the problems that the existing methods for measuring the suction force and pore solution concentration in soil are complicated and destructive to the soil

Method used

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  • Polluted soil body suction and pore solution concentration measuring method and device
  • Polluted soil body suction and pore solution concentration measuring method and device
  • Polluted soil body suction and pore solution concentration measuring method and device

Examples

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Embodiment 1

[0036] like figure 1As shown, the embodiments of the present invention provide a method for measuring the suction force of polluted soil and the concentration of pore solution, including:

[0037] Step 1, preparing standard samples, uniformly mixing preset amounts of chemical solutions of different concentrations with the samples, respectively preparing a number of standard samples within the preset volume water content range, and sending the standard samples into the measuring device;

[0038] Step 2: Carry out a calibration test to test the dielectric constant ε and electrical impedance Z of the standard sample L , combined with the electrical impedance of the standard sample to calculate the conductivity value of the sample σ s , the measured water content θ of the standard sample and the conductivity value of the pore solution σ w ;

[0039] Step 3: Calibrate the fitting curve, fit the dielectric constant ε with the measured water content θ of the standard sample, and o...

Embodiment 2

[0051] like figure 2 , 3 , 4, the embodiments of the present invention provide a polluted soil suction and pore solution concentration measuring device, comprising: top cover 1, soil column chamber 2, base 3, chemical solution circulation system 4, gas circulation system 5 and a data acquisition system 6; the top cover 1 is arranged on the upper end of the soil column chamber 2, the base 3 is arranged on the lower end of the soil column chamber 2, the top cover 1, the soil column chamber The chamber 2 and the base 3 cooperate to form a closed space, which is used to place the sample 7; the top cover 1 is provided with a gas inlet 11 and a gas outlet 12, and the gas circulation system 5 passes through the gas inlet 11 and the gas outlet 12 communicate with the inside of the soil column chamber 2, and the gas circulation system 5 is used to provide gases with different suction values ​​to the inside of the soil column chamber 2; the base 3 is provided with a solution inlet 31...

Embodiment 3

[0062] Embodiment 3 of the present invention adopts dialysis method to control suction in the soil, and concrete test flow and method are as follows:

[0063] (1) First, the calibration test of the water content and the conductivity of the pore solution is carried out on the TDR system.

[0064] Adopt KCl solution (0.01mol / L, 0.03mol / L, 0.05mol / L) of 3 kinds of concentrations, mix with the soil sample and compact to make 8 standard samples (the quantity of described standard samples can be greater than 8 ), and keep the water content of the standard sample volume between 0.3-0.6. Put the standard sample into the soil column chamber 2 of the test device, insert the TDR probe 61 into a designated position in the soil, and use the TDR system to test the dielectric constant ε and electrical impedance Z of the standard sample L . Through the empirical formula, combined with the electrical impedance of the standard sample to calculate the soil conductivity σ s . Take some soil s...

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Abstract

The invention provides a polluted soil body suction and pore solution concentration measuring method and device. The method comprises the steps that a standard sample is prepared, a calibration test is performed, a fitting curve is calibrated, sample suction is controlled, data is recorded and analyzed, and the sample suction and the pore solution concentration are calculated. The device comprisesa top cover, a soil column chamber, a base, a chemical solution circulating system, a gas circulating system and a data acquisition system. A suction in soil is accurately controlled by adopting a dialysis method and a gas phase method; a corresponding matrix suction and an osmotic suction of different chemically polluted soil bodies under different water contents can be measured; and a TDR technology is adopted to determine the water content of the soil body and the concentration of the pore solution, combined determination of the suction in the soil and the concentration of the pore solution can be realized according to a soil-water characteristic curve and a corresponding relationship between the conductivity of the pore solution and the concentration of the pore solution, and the method and the device have advantages of high precision, high speed, a undamaged state, automatic monitoring and the like.

Description

technical field [0001] The invention relates to the technical fields of geological engineering and civil engineering (rock and soil), in particular to a method and device for measuring the suction force of polluted soil and the concentration of pore solution. Background technique [0002] Industrial and mining enterprises such as solid waste treatment plants, chemical plants, and non-ferrous metal smelters discharge a large amount of organic and inorganic pollutants into the surrounding environment during construction and operation, making the original site a severely polluted site. In contaminated sites, the engineering properties of contaminated soil and the migration of pollutant solutes in pore solutions are two issues that people are most concerned about. [0003] Soil suction is an important parameter to study the engineering properties of unsaturated contaminated soil, and the change of water content and pore solution concentration reflects the law of solute migration...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/22G01N27/06G01N15/08G01N13/04
CPCG01N13/04G01N15/08G01N27/06G01N27/221
Inventor 贺勇胡广朱考飞张可能薛生国李建中
Owner CENT SOUTH UNIV
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