Method for controlling dryness and humidity of salt expansion test

Abstract

The invention discloses a method for controlling dryness and humidity of a salt expansion test. According to the method, a salt expansion tester is used for carrying out the salt expansion test. The method is characterized in that a pipeline connected with a water source is connected into a salt expansion tester inner cylinder and is used for controlling humidification of sample soil, and a pipeline connected with an air source is connected into an air drying unit arranged on the inner wall of the salt expansion tester inner cylinder and is used for controlling air drying of the sample soil during test. The method is capable of controlling more environment parameters and improving test simulation effect, has the advantages of simplicity in implementation, high test accuracy, flexible and adjustable in sample parameters and various test manners, and is extremely applicable to the study of properties of saline soil.

Description

technical field [0001] The invention relates to the field of research on salt expansion hazards of saline soil, in particular to a dry humidity control method for a salt expansion test. 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 China is about 200,0...

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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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