Method for determining thickness of edge wall treatment layer in coarse-grained soil permeation test

Abstract

The invention discloses a method for determining the thickness of an edge wall treatment layer in a coarse-grained soil permeation test. The method comprises the following steps: measuring the contentof each particle size group, the median size and the particle density of the coarse-grained soil through particle screening and particle density testing; calculating the representative particle sized of a sample; obtaining a plane void ratio correction coefficient [epsilon] under an actual void ratio e of the coarse-grained soil sample through a maximum dry density and minimum dry density test of the sample; calculating a stacking angle [alpha] of the equi-diameter circular packing model reflected in the plane; and finally, determining the thickness h of the edge wall treatment layer under condition of the diameter D of the permeameter. The method for determining the thickness of the edge wall treatment layer in the coarse-grained soil permeation test is clear in principle, and easy to operate and calculate; the thickness of the edge wall treatment layer can be accurately determined by means of the conventional indoor geotechnical test, thereby providing a reasonable thickness basisof the edge wall treatment layer for the coarse-grained soil permeation test.

Description

technical field [0001] The invention relates to a method for determining the thickness of a side wall treatment layer in a coarse-grained soil penetration test. Background technique [0002] Coarse-grained soil has become an important filling material for earth-rock dams due to its advantages of high shear strength, low compressibility and wide range of sources. As a dam material, the permeability coefficient of coarse-grained soil is the basic hydraulic element for seepage control of earth-rock dams; it characterizes the strength of soil permeability and is a comprehensive index reflecting factors such as filler particle composition, compactness, and pore size. In the construction design stage of an earth-rock dam, accurate acquisition of the permeability coefficient of the coarse-grained soil filler is directly related to the safe operation of the project. [0003] The constant head permeability test is a standard method for indoor determination of the permeability coeffi...

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Problems solved by technology

[0005] However, when smearing flexible materials on the side walls, the smearing thickness is determined by the experience of the operator and is highly arbitrary

When the thickness of the smear is too thin, the purpose of sealing the leakage channel cannot be achieved, and the test data is still too large; however, too much smear material and too thick treatment layer will dirty the sample and fill the normal pores in the soil, resulting in biased test data. Small

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