Method and device for measuring suction force and pore solution concentration of polluted soil
A solution concentration and measurement method technology, applied in the direction of measuring devices, suspension and porous material analysis, instruments, etc., can solve the problems of soil destructiveness, soil suction and pore solution concentration test process complexity, etc., to achieve high precision, The effect of high speed and simplified measurement process
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Embodiment 1
[0036] Such as 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, an...
Embodiment 2
[0051] Such as 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 ...
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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