High-pressure dissolved air saturation test device and its application in artificial preparation of air-bearing soil samples

Abstract

The invention belongs to the technical field of artificial simulation sample preparation testing of geotechnical engineering seabed gas contained deposition, and particularly discloses a high-pressure gas dissolved saturation test device and an application thereof in gas contained soil sample artificial preparation. The device provided by the invention comprises a gas source tank, a reaction kettle, a lifting device, a geotechnique triaxial testing system, a connecting pipeline, a valve and a pressure meter. The artificial simulation preparation of a laboratory gas contained soil sample can be realized without pressure condition restriction by the device; the device is especially suitable for the sample preparation of a high-saturability gas contained deposition soil body in indoor triaxial testing; the gas contained quantity can be controlled artificially and can be quantified accurately; the prepared soil sample is uniform and has preparation repeatability.

Description

technical field [0001] The invention relates to the technical field of artificial simulation sample preparation test of seabed gas-bearing sediments in geotechnical engineering, in particular to a high-pressure dissolved gas saturation test device and its application in artificial preparation of gas-bearing soil samples. Background technique [0002] Submarine shallow gas usually refers to the gas accumulated in the sediment within 1000m below the seabed surface. The components of shallow gas mainly include methane, carbon dioxide, hydrogen sulfide, ethane, etc. Among them, methane generally has the highest content, and is generally distributed in lakes, valleys, bays, deltas and other waters and sea areas with relatively rich oil and gas resources. The gas is mainly derived from the biogenic gas formed by the decomposition of organic matter and the gas produced by deep oil and gas, mantle and magmatic activities and then migrated from the upper part and sealed in the shallo...

AI Technical Summary

Problems solved by technology

Although the gas-bearing soil samples prepared by this method are uniform, the pressure conditions are limited. When the ambient pressure is greater than the adsorption pressure, the gas in the zeolite cannot be replaced.

Therefore, it is only applicable to the shallow sea pressure environment, and cannot be artificially prepared indoors for the air-bearing soil in the simulated deep sea pressure environment

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