Experimental method for obtaining nuclide migrating parameters in clay by utilizing flexible-wall permeameter

Abstract

The invention belongs to the technical field of research of soil analytical methods, in particular relates to an experimental technical method of quickly obtaining nuclide migrating parameters in clay by utilizing a flexible-wall permeameter. The experimental method comprises the following steps: I. pressing a clay material into a plurality of cylindrical samples with determined dry densities, and respectively putting into a pressure chamber of the flexible-wall permeameter for saturation; after finishing the saturation, uniformly adding tracer nuclides into the bottoms of the samples, and setting different pressure values to carry out an experiment, meanwhile, regularly collecting percolate at outlets, and calculating the percolation rates; II. stopping the experiment when the tracer nuclides occur in the percolate of the samples under the highest pressure, and taking the samples out and cutting into thin sheets of 1mm along the axial directions, performing dissipation, and measuring the concentration of the nuclides so as to obtain a nuclide concentration distribution curve of a plurality of groups of nuclides along the axial directions of soil columns; III. performing experimental calculation. The experimental method can be applied to the field of measurement of the nuclide migrating parameters.

Description

technical field [0001] The invention belongs to the research technical field of soil analysis methods, in particular to an experimental technical method for quickly obtaining nuclide migration parameters in clay by using a flexible wall permeameter, which can be used in the field of nuclide migration parameter testing. Background technique [0002] The research on the migration behavior of nuclides in clay media materials provides a technical basis for the design, site selection, construction and safety assessment of radioactive waste repositories. At present, the main methods for studying nuclide migration include laboratory experiments, simulated calculations, and field tests. Based on the parameters related to nuclide migration obtained through laboratory experiments and field tests, numerical simulation calculations are used to evaluate the migration of nuclides over a long period of time. situation. However, due to the low permeability of clay medium materials and stro...

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Problems solved by technology

[0003] The comparative analysis of the literature shows that the flexible wall permeameter proposed by the present invention is an experimental technical method for quickly obtaining the nuclide migration parameters in clay, and no patents and literatures with the same principle as the invention have been found in related fields at home and abroad.

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