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Soil triaxial apparatus-based unsaturated soil gas-permeability measuring method

A technology of gas permeability and measurement method, applied in the field of gas permeability testing of geotechnical materials, can solve the problems of changing the initial pore structure, large test error, etc.

Inactive Publication Date: 2014-07-09
63653 FORCES PLA
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  • Application Information

AI Technical Summary

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

Method used

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  • Soil triaxial apparatus-based unsaturated soil gas-permeability measuring method

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Embodiment

[0027] 1. The steps of the method for measuring the gas permeability of unsaturated soil:

[0028] Step 1. Fix the sample wearing the sealing rubber sleeve on the base of the triaxial chamber, and arrange high-permeability permeable stones on the upper and lower tops of the sample wearing the sealing rubber sleeve;

[0029] Step 2: Set a loading pad and a loading shaft on the top of the upper high-permeability permeable stone, wherein the loading shaft and the triaxial chamber are installed on the triaxial instrument;

[0030] Step 3 Open the water inlet valve to inject water into the triaxial chamber until it is full, then close the valve and apply a confining pressure of 40kPa.

[0031] Step 4 Preheat the gas mass flow controller for about 20 minutes, and debug the data acquisition system.

[0032] Step 5 Turn on the vacuum pump, then slowly adjust the valve to the maximum position, and set the range of the gas mass flow controller; slowly adjust the valve to measure, and o...

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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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IPC IPC(8): G01N15/08
Inventor 不公告发明人
Owner 63653 FORCES PLA
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