A method for determining the thickness of the side wall treatment layer in the penetration test of coarse-grained soil

Abstract

The invention discloses a method for determining the thickness of a side wall treatment layer in a coarse-grained soil penetration test. From the particle sieving and particle density test, the content of each particle size group, median particle size and particle density of coarse-grained soil are measured, and the representative particle size d of the sample is calculated; with the help of the maximum dry density and minimum dry density test of the sample, it is obtained The plane void ratio correction coefficient ξ under the actual void ratio e of the coarse-grained soil sample is used to calculate the stacking angle α reflected in the stacking model of equal-diameter circles on the plane, and finally determine the thickness h of the side wall treatment layer under the condition of the diameter D of the permeameter. The principle of this method is clear, the operation and calculation are simple, and the thickness of the side wall treatment layer can be accurately determined by conventional indoor geotechnical test methods, which provides a reasonable basis for the thickness of the side wall treatment layer for the coarse-grained soil permeability 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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