An Experimental System for Direct Measurement of Permafrost Permeability

A technology of permeability characteristics and experimental system, which is applied in the field of direct measurement experiment system of permafrost permeability characteristics

Active Publication Date: 2021-09-14
HARBIN INST OF TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] An object of the present invention is to provide a direct measurement experimental system of permafrost permeability characteristics to solve the problem of direct measurement of saturated permafrost permeability characteristics

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  • An Experimental System for Direct Measurement of Permafrost Permeability
  • An Experimental System for Direct Measurement of Permafrost Permeability

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Embodiment Construction

[0025] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0026] In order to illustrate the present invention more clearly, the present invention will be further described below in conjunction with the embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

[0027] The present invention provides an embodiment of an experimental system for direct measurement of permafrost permeability, figure 1 A schematic diagram showing an experimental system for direct measurement of permafrost permeability characteristics provided by the present invention.

[0028] The measuring section is used to measure the permeability characteristics o...

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Abstract

The invention relates to an experimental system for directly measuring permeation characteristics of frozen soil, which relates to the field of frozen soil measurement. The invention aims to solve the direct measurement of the permeability characteristics of saturated frozen soil. Technical points: the measuring section is used to measure the permeability characteristics of the sample frozen soil; the gradient section is used to reduce the moisture temperature in the gap between soil particles to the measurement temperature; the temperature control system is used to maintain a constant temperature in the measuring section and ensure The temperature gradient changes in the gradient section; the inlet constant pressure system is used to ensure the constant inlet fluid pressure; the flow measurement system is used to measure the permeate fluid flow. The measurement of the permeability characteristics of frozen soil solves the problem of the difficulty of injection of super-low temperature fluid through the connection of the gradient section and the measurement section, making the direct measurement of frozen soil feasible. The gradual change section adopts the method of alternating high and low temperature temperature control coils, which makes the temperature gradient controllability of the gradual change section stronger. The inlet constant pressure system can flexibly adjust different inlet pressures according to the experimental requirements.

Description

technical field [0001] The invention relates to the field of frozen soil measurement, in particular to an experimental system for directly measuring the permeability characteristics of frozen soil. Background technique [0002] When the saturated soil freezes, there will still be some unfrozen water in the soil. The reasons for this phenomenon are: (1) The molecular interaction force between the soil particles and the ice, when the gap between the soil particles and the ice layer decreases To a certain extent, due to the intermolecular repulsion between the soil particles and the ice, a certain gap will be maintained between the soil particles and the ice layer. (2) The influence of the interfacial tension of ice and water. The Gibbs free energy of will increase. The existence of unfrozen water provides flow channels for permafrost infiltration to a certain extent. In cold regions, climate change will cause water and heat migration in permafrost, which will greatly affect ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
Inventor 李炳熙许飞梁爽张亚宁王维
Owner HARBIN INST OF TECH
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