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Test system for measuring gas permeability parameters of ultra-low permeability media under multi-field and multi-phase coupling conditions

A gas permeation and test system technology, which is applied in measurement devices, permeability/surface area analysis, suspension and porous material analysis, etc. It can solve problems such as the inability to simulate the effect of gas permeation, and achieve a wide measurement range and accurate measurement of gas flow. , good reliability

Active Publication Date: 2021-12-07
TONGJI UNIV
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Problems solved by technology

However, these three types of existing permeation devices are unable to simulate the influence of complex conditions such as temperature field and stress field on gas permeation in the test.

Method used

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  • Test system for measuring gas permeability parameters of ultra-low permeability media under multi-field and multi-phase coupling conditions
  • Test system for measuring gas permeability parameters of ultra-low permeability media under multi-field and multi-phase coupling conditions
  • Test system for measuring gas permeability parameters of ultra-low permeability media under multi-field and multi-phase coupling conditions

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Embodiment Construction

[0035] The technical solutions provided by the application will be further described below in combination with specific embodiments and accompanying drawings, and the advantages and features of the application will become clearer in combination with the following description.

[0036] Such as figure 1 As shown, the test device described in this application includes a triaxial percolation chamber 1 , a temperature sensing control device 3 , a volume / pressure controller 4 , a gas injection device 6 , an outlet buffer container 7 , and an ultra-low permeation flow monitoring device 8 .

[0037] The triaxial seepage chamber 1 is the main part of the test system;

[0038] The temperature sensing control device 3 is located outside the triaxial seepage chamber 1, and can precisely control the temperature of the tested rock and soil sample during the penetration test through indirect heating.

[0039] The volume / pressure controller 4 adopts an ADVDPC type controller, and is connecte...

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Abstract

The application belongs to the technical fields of geotechnical engineering and geological engineering, and provides a test system for measuring gas permeability parameters of ultra-low permeability media under multi-field multi-phase coupling conditions. The system includes a triaxial seepage chamber, a deformation monitoring device, a temperature sensing control device, a volume / pressure controller, a bias stress loading device, a gas injection device, an outlet buffer container, and an ultra-low seepage flow monitoring device. During the test, temperature and triaxial stress control is first applied to the rock and soil sample; the gas injection device is used to inject high-pressure gas into the rock and soil sample, and the high-pressure gas enters the outlet buffer container and the ultra-low seepage flow monitoring device after permeation. The gas permeation flow rate is obtained; the deformation monitoring device can measure the local absolute deformation of the rock and soil sample during the test. The solution provided by the present application has the beneficial effects of realizing the whole-process monitoring of gas permeation in ultra-low-permeability media under multi-field and multi-phase coupling conditions, and being able to obtain gas permeation characteristics and macroscopic deformation characteristics.

Description

technical field [0001] The application relates to a test system for measuring gas permeability parameters of ultra-low permeability media under multi-field and multi-phase coupling conditions in the technical fields of civil engineering (geotechnical) and geological engineering. Background technique [0002] The deep geological disposal of high-level radioactive nuclear waste is to seal the waste in a suitable rock mass 500-1000m below the surface by setting up various barriers to prevent the leakage and migration of nuclides. According to the different surrounding rocks, the repository can be divided into single barrier repository and double barrier repository. Among them, the double-barrier repository uses hard rock as the surrounding rock, such as the Yucca Mountain in the United States, the repository in Japan, and the pre-selected repository in Beishan, China. In the double barrier reservoir, high-compacted bentonite with montmorillonite as the main component is the mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
CPCG01N15/0806G01N15/0826
Inventor 叶为民崔林勇王琼季裕恒陈永贵陈宝
Owner TONGJI UNIV
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