A kind of preparation device and method of air-bearing soil

Abstract

Belonging to the technical field of indoor geotechnical test, the invention relates to a preparation device and method for gas bearing soil. A sample lower base and a sample upper base are both equipped with a nylon tube interface on the same sides, and are connected to a fourth nylon tube and a third nylon tube respectively through the nylon tube interfaces, the top of the sample upper base is equipped with lower permeable stones, a sand soil sample and upper permeable stones in order, a force transmission rod and a pressure chamber top base are mounted above the upper permeable stones, the pressure chamber top base is connected to a pressure chamber bottom base through pressure chamber pull rods, and the top of the pressure chamber top base is equipped with screw rod screws. The fourth nylon tube is connected to a first three-way valve through a first valve, a first nylon tube is respectively connected to the third nylon tube and a second three-way valve, the second three-way valve is communicated with the first three-way valve and is then connected to a first gas-liquid replacer pipeline, the top of the sand soil sample is connected to a second nylon tube, the second nylon tubeis connected to a second gas-liquid replacer pipeline through a third valve, the preparation process of the gas bearing soil sample is simple, the operation is convenient, and the cost is saved.

Description

Technical field: [0001] The invention belongs to the technical field of indoor geotechnical tests, and relates to an air-bearing soil preparation device and method. Background technique: [0002] There are a large amount of gas hydrate (commonly known as "combustible ice") resources in the South China Sea, East China Sea and land permafrost regions. Gas hydrate is very sensitive to temperature and pressure conditions, and will decompose with a slight disturbance to produce a large amount of natural gas. The gas is in the form of free bubbles Distributed in the pores, the soil layer evolves into air-bearing soil, and the mechanical properties change, especially the stiffness and strength of the soil layer decrease. The deterioration of the properties will cause disasters such as landslides, liquefaction, and foundation subsidence, which will bring disasters to marine engineering. serious security threat. [0003] At present, there are few studies on air-bearing soil at home ...

AI Technical Summary

Problems solved by technology

[0003] At present, there are few studies on air-bearing soil at home and abroad, and the research on its mechanical properties is rarely involved. Moreover, limited by the difficulties and defects of on-site coring and in-situ experimental techniques, indoor soil tests are generally used to carry out air-bearing soil energy soil research. Research on Mechanical Properties

Triaxial testing machines are widely used in indoor geotechnical tests. Most of the existing air-bearing soil samples are prepared by modifying triaxial testing machines. Requires heaters, constant temperature devices, reaction kettles, etc.; second, many test materials are required, such as sodium bicarbonate, tetrahydrofuran, zeolite particles, etc.; third, the steps are complicated; fourth, the operation level of the experimenters is high.

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