Instrument for measuring diffusion coefficient of solution ions in soil body

Abstract

The invention discloses an instrument for measuring a diffusion coefficient of solution ions in a soil body, belonging to the technical field of geotechnical engineering. The instrument comprises a shell with an internal cavity, and a soil sample container with a hole at one side, wherein the soil sample container is fixed at the bottom in the internal cavity of the shell, the outside of the soil sample container is in seamless contact with the inner wall of the shell, and one side of the soil sample container with the hole faces to the internal cavity of the shell. The solution and the soil sample can be separated by the instrument, and the giant expansion pressure caused by the special soil sample capable of expanding after water adsorbing cannot be acted on the external instrument, the overtop stress demand on the integral test instrument is avoided; meanwhile, the condition that the ions can enter the test soil body from top to the bottom to diffuse in single direction; the structure of the instrument is simple. Furthermore, the instrument is not only capable of performing the saturated soil test, but also capable of performing the unsaturated soil test.

Description

technical field [0001] The invention belongs to the technical field of geotechnical engineering, and relates to an instrument for measuring the diffusion coefficient, in particular to an instrument for measuring the diffusion coefficient of solution ions in high-compaction expansive soil. Background technique [0002] In order to study the diffusion characteristics of solution ions in soil, it is necessary to determine its diffusion coefficient. In the prior art, some of the test instruments used to measure the diffusion coefficient of ions in the soil do not separate the solution from the soil sample, that is, the solution and the soil sample are directly loaded into the upper and lower sides of the instrument, which not only makes the whole instrument perform special In the test of expansive soil, a large pressure bearing capacity should be considered, and it is not convenient to choose whether to conduct a saturated soil test or an unsaturated soil test; in addition, it i...

AI Technical Summary

Problems solved by technology

In the prior art, some of the test instruments used to measure the diffusion coefficient of ions in the soil do not separate the solution from the soil sample, that is, the solution and the soil sample are directly loaded into the upper and lower sides of the instrument, which not only makes the whole instrument perform special In the test of expansive soil, it is necessary to consider the large pressure bearing capacity, and it is not convenient to choose whether to conduct a saturated soil test or an unsaturated soil test; in addition, it is difficult to realize the test process that requires ions to diffuse from a single direction

There are also some instruments in the prior art that can separate the solution from the soil sample, but the soil sample and the solution are still connected through several pipes, which are lacking in ensuring sufficient contact between the solution and the soil sample and the sealing of the test

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