Derivation Method of Equivalent Pore Size of Pores Between Clay Particles

A technology of pore radius and particle, applied in the field of practical application of geotechnical engineering, can solve the problem of not given quantitative method, limitation and so on

Inactive Publication Date: 2019-04-12
EAST CHINA JIAOTONG UNIVERSITY
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  • Claims
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Problems solved by technology

However, most of the existing studies are limited to evaluating the relationship between the pore size, pore size distribution and capillary pressure in unsaturated soil, and have not given a quantitative method for calculating the pore size.

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  • Derivation Method of Equivalent Pore Size of Pores Between Clay Particles
  • Derivation Method of Equivalent Pore Size of Pores Between Clay Particles
  • Derivation Method of Equivalent Pore Size of Pores Between Clay Particles

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Embodiment Construction

[0059] A method for deriving the equivalent pore size of pores between clay particles, specifically according to the following steps:

[0060] step 1,

[0061] Firstly, clay-containing soil samples were prepared for soil-water characteristic test, and a complete soil-water characteristic curve was obtained by fitting the formula (1) through MATLAB, expressed in terms of mass water content. The fitting formula is as follows:

[0062]

[0063] In the formula: θ is mass water content;

[0064] u a -u w is the matrix suction;

[0065] θ r is the residual moisture content;

[0066] θ s is the saturation moisture content;

[0067] a, m and n are fitting parameters. The parameter n is related to the soil pore size distribution, and the parameter m is related to the overall symmetry of the soil-water characteristic curve.

[0068] The pore structure of soil determines the vapor pressure in equilibrium. The Kelvin (Kelvin) formula, on the premise of not violating the orig...

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Abstract

The invention discloses an equivalent method of aperture for hole between clay particles, and provides a complete soil-water characteristic curve by fitting. Data of matrix suction which is between 144000kPa-0kPa are selected, the matrix suction is converted into relative humidity RH, mass water content is converted into volume of water for filling holes in soil per unit mass, Kelvin radius is calculated, real hole radius and thickness of water membrane are calculated, an average hole radius is calculated, and then a equivalent capillary diameter of soil is calculated, and finally a maximum capillary height is calculated The complete soil-water characteristic curve is used as a carrier, based on the prior research and a lot of experiments combined with statistics theory, the equivalent method of aperture of soil sample containing different clay particles, thereby providing a favorable approach for calculating the maximum capillary height.

Description

technical field [0001] The invention belongs to the technical field of practical application of geotechnical engineering, and relates to a method for deriving the equivalent pore diameter of pores between clay particles. Background technique [0002] Unsaturated soil consists of soil particles, moisture, air and shrink film. The size, shape and distribution of the pores in the soil are important factors in the structural composition of the soil, and play an important role in the overall engineering behavior related to the volume of the soil. Measuring or estimating pore physical properties also has a profound impact on predicting soil strength, compressibility, and permeability. The magnitude of soil suction can represent the compactness of soil particles, water content and the curvature of shrinkage film in unsaturated soil. Therefore, there have been many studies on the use of soil-water characteristic curves to estimate pore size distribution. However, most of the exist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
Inventor 耿大新李宇晗王迎迎石钰锋
Owner EAST CHINA JIAOTONG UNIVERSITY
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