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A Method for Measuring Gas Permeability of Unsaturated Soil Based on Soil Triaxial Apparatus

A technology of gas permeability and measurement method, which is applied in the field of gas permeability testing of rock and soil materials, and can solve problems such as large test errors and changing the initial pore structure

Inactive Publication Date: 2017-01-04
63653 FORCES PLA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With gas as the infiltration medium, the principle of positive pressure measurement is generally adopted. In order to ensure the sealing of the sample ring to the side, it is required to apply a confining pressure greater than the positive pressure value used for measurement, at least 0.1-0.2MPa, and the resistance of unsaturated soil The compressive strength generally does not exceed the order of 1MPa, and a larger confining pressure will change the initial pore structure of the measured sample, resulting in a larger test error

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  • A Method for Measuring Gas Permeability of Unsaturated Soil Based on Soil Triaxial Apparatus
  • A Method for Measuring Gas Permeability of Unsaturated Soil Based on Soil Triaxial Apparatus
  • A Method for Measuring Gas Permeability of Unsaturated Soil Based on Soil Triaxial Apparatus

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Embodiment Construction

[0025] A method for measuring gas permeability of unsaturated soil based on soil triaxial instrument:

[0026] The structure of the triaxial instrument is as follows: the upper top and the lower bottom of the sample 21, which is fixed on the base 22 of the triaxial chamber 20 and wears a rubber seal, are respectively provided with high-permeability permeable stones 18, and the upper high-permeability permeable stones The top of 18 is evenly distributed with the loading shaft 17 and the loading pad 19, and the pipeline of the high-permeability permeable stone 18 at the bottom is connected to the pipeline of the intake valve 3; on the left side of the base box, a connecting triaxial chamber 20 and the water intake valve are arranged. 1, the pipeline connecting the outlet valve 2 of the triaxial chamber 20 is arranged on the right side of the base box; The gas outlet valve 4, the pipeline of the desiccant device 5 and the filter 6; the gas pressure transmitter 15 is arranged on t...

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Abstract

The invention provides a soil triaxial apparatus-based unsaturated soil gas-permeability measuring method. The soil triaxial apparatus-based unsaturated soil gas-permeability measuring method utilizes a triaxial apparatus as a basic device and gas pressure and mass flow measuring devices as additional devices to realize unsaturated soil gas-permeability measurement. According to the soil triaxial apparatus-based unsaturated soil gas-permeability measuring method, based on a gas exhaust principle, sample circular-side sealing is realized by small confining pressure application so that the confining pressure influence on a sample pore structure is reduced. The soil triaxial apparatus-based unsaturated soil gas-permeability measuring method utilizes a triaxial apparatus as the basic device so that gas permeability measurement is realized, study of an unsaturated soil pore structure change rule under triaxial test conditions is realized, and stress, strain and gas permeability can be synchronously measured under the triaxial test conditions.

Description

technical field [0001] The invention relates to the test of the gas permeability of rock and soil materials, especially for the laboratory test of the gas permeability of rock and soil materials with excellent effect. Background technique [0002] Geotechnical materials are generally porous media, and permeability is one of their basic properties. At present, the permeability measurement of rock and soil materials is distinguished according to the selected seepage medium, which can be divided into two types: liquid and gas, and the corresponding test methods are hydraulic pressure test and air pressure test method. Liquid is used as the penetrating medium. Because the viscosity of liquid is much higher than that of gas, the pressure required for the same measurement object is relatively high, reaching the MPa level. Higher pore pressure will change the microscopic pore structure of the material. Using liquid as the penetrating medium is easy to have physical and chemical in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
Inventor 不公告发明人
Owner 63653 FORCES PLA
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