Device for testing characteristic curves and permeability coefficients of unsaturated coarse particle soil and water

A technology of soil-water characteristic curve and permeability coefficient, which can be used in measurement devices, soil material testing, permeability/surface area analysis, etc., and can solve problems such as long test time and uneven sample preparation.

Inactive Publication Date: 2013-09-18
ZHEJIANG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

This method is still not mature, and there are problems such as long test time and uneven sample preparation.

Method used

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  • Device for testing characteristic curves and permeability coefficients of unsaturated coarse particle soil and water
  • Device for testing characteristic curves and permeability coefficients of unsaturated coarse particle soil and water
  • Device for testing characteristic curves and permeability coefficients of unsaturated coarse particle soil and water

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Embodiment Construction

[0019] The present invention will be further described below in conjunction with drawings and embodiments.

[0020] like figure 1 , figure 2 As shown, the present invention includes a cylindrical rigid permeation column 1, six TDR sensors 2, six tensiometers 3, two pore pressure gauges 4 and six hygrometers 5; there is a reverse filter layer at the bottom of the cylindrical rigid permeation column 1 , the upper part of the reverse filter layer is filled with compacted soil samples. The soil samples used are group B fillers of high-speed railway foundation. The particle size is greater than 2mm and accounts for about 80% of the total mass. Simultaneously bury the first TDR sensor, the first tensiometer or the first hygrometer, and then go up in sequence. After the sixth layer of soil sample is compacted, bury the sixth TDR sensor at the same height, and the sixth The first layer of soil samples and the sixth layer of soil samples respectively buried the first piezometer 4 an...

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Abstract

The invention discloses a device for testing characteristic curves and permeability coefficients of unsaturated coarse particle soil and water. A reversed filter is arranged at the bottom of a cylindrical rigid permeation column; six layers of compacted soil samples are arranged at the upper part of the reversed filter; a TDR (test data report) sensor, a tensiometer or a humidometer are buried at the same height on the same layer; pore pressure gauges are buried in the first layer and the sixth layer; the TDR sensor, and the tensiometer or the humidometer form 90 degrees; each pore pressure gauges and the tensiometer or the humidometer form 90 degrees; a waterhead stabilizer is externally connected with a water storage container and a water tank for providing a reference liquid level; the waterhead stabilizer is accessed into the reversed filter via a drainage valve; a top plate of the cylindrical rigid permeation column is connected with the drainage valve. Saturated ermeability coefficients of coarse particles can be obtained through the pore pressure gauges and the waterhead stabilizer after the sample is saturated; the change processes of of matric suctions and moisture contents of a soil body in each layer at different moments along with the time can be obtained through the corresponding tensiometer or the corresponding humidometer and the corresponding TDR sensor at the saturation, drainage and evaporation stages at the same time. Thus, mechanical parameters of the unsaturated coarse particle soil and water are obtained.

Description

technical field [0001] The invention relates to a device for measuring hydraulic parameters of unsaturated soil, in particular to a device for testing the soil-water characteristic curve and permeability coefficient of unsaturated coarse-grained soil. Background technique [0002] The hydraulic parameters of unsaturated soil include soil-water characteristic curve and seepage function. The soil-water characteristic curve describes the relationship between matrix suction and water content (such as: saturation, volumetric water content, etc.); The relationship between permeability coefficient and matric suction or water content. These parameters play a key role in the analysis of problems related to unsaturated soils, multiphase flow in porous media, and subsurface transport of pollutants. Therefore, it is of great significance to determine the hydraulic parameters of unsaturated soil in the research and engineering practice of unsaturated soil. [0003] At present, there ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08G01N33/24
Inventor 陈仁朋吴进尹鑫晟王瀚霖
Owner ZHEJIANG UNIV
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