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

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...

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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.

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