A sample barrel of a salt swelling tester

Abstract

The invention discloses a sample barrel of a salt expansion tester. The sample barrel comprises an outer barrel and an inner barrel arranged in the outer barrel, wherein the outer barrel is vertically arranged on a sample barrel frame; a circumferential circulating liquid chamber is formed by gaps between the outer barrel and the inner barrel. The sample barrel is characterized in that a bottom cover is arranged at the bottom surface of an inner cavity of the inner barrel; the bottom surface of the inner cavity of the inner barrel is formed by the upper surface of the bottom cover; the periphery of the bottom cover is in up-down sliding contact with the circumferential wall of the inner cavity of the inner barrel; a bottom-cover height adjusting mechanism capable of realizing height and position adjustment of the bottom cover is arranged below the bottom cover. The sample barrel disclosed by the invention has the advantages that the height of a sample can be conveniently and quickly adjusted, control of more environmental parameters is realized, the test simulating effect is improved and the testing accuracy is improved and the like.

Description

technical field [0001] The invention relates to the field of research on the harm of salt expansion of saline soil, in particular to a sample barrel structure of a multifunctional salt expansion tester. Background technique [0002] saline soil is saline and alkaline earth and various salinization, alkaline soil the general term for. Saline soil refers to the soluble salt content in the soil that is significantly harmful to crop growth. Soil . Salt content indicators vary with different salt compositions. Alkaline soil refers to the soil containing a large amount of exchangeable sodium that harms plant growth and changes soil properties. Saline soil is mainly distributed in inland arid, Half arid area , There are also distributions in coastal areas. The area of ​​saline soil in the world is about 8.97 million square kilometers, accounting for about 6.5% of the world's total land area and 39% of the total area of ​​arid regions. The area of ​​saline soil in Chi...

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Problems solved by technology

At present, the existing salt expansion tester still has the following shortcomings: ①It can only do the salt expansion test under the action of temperature (freeze-thaw cycle, temperature gradient) and load, and cannot realize the dry-wet cycle with continuous change of water content under constant temperature The salt expansion test cannot realize the salt expansion test coupled with the freeze-thaw cycle and the dry-wet cycle under load; ②The function is simple and the degree of integration is low; ③The sample bucket with an overall structure is used, and the sample size and height of the salt expansion test are relatively large , during the test, the sample bucket significantly constrains the vertical salt expansion of the sample, resulting in significantly smaller test results; ④ The height of the test bucket is fixed, resulting in limited adjustment of the sample height and size

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