Prediction method for saturated and unsaturated permeability coefficients of deformed soil based on fractal theory

A technology of permeability coefficient and fractal theory, which is applied in the field of prediction of unsaturated permeability coefficient and deformation soil saturation method based on fractal theory, can solve the problems of cumbersome calculation, prediction accuracy to be improved, and insufficient research on related mechanisms

Inactive Publication Date: 2017-12-08
HUBEI UNIV OF TECH
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Problems solved by technology

[0003] For the saturated permeability coefficient under deformation conditions, it is generally predicted by establishing an empirical relationship with the void ratio. This method does not study the relevant mechanism deeply enough, and the prediction accuracy needs t...

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  • Prediction method for saturated and unsaturated permeability coefficients of deformed soil based on fractal theory
  • Prediction method for saturated and unsaturated permeability coefficients of deformed soil based on fractal theory
  • Prediction method for saturated and unsaturated permeability coefficients of deformed soil based on fractal theory

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[0059] The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings, but they do not constitute a limitation to the present invention, and are merely examples; at the same time, the advantages of the present invention will become clearer and easier to understand through the description.

[0060] Reference Figure 1-6 Shown: The concrete realization method of the prediction method of saturated and unsaturated permeability coefficient of deformed soil based on fractal theory of the present invention is:

[0061] Using microscopic pore channels, the flow of water satisfies Darcy's law:

[0062]

[0063] Among them: v is the average flow velocity of the fluid at the channel section. J is hydraulic slope, J=h w / l, l is the study length, h w Is the head loss, h w =h f +h j , Where: h f Is the loss along the way, h j It is a partial loss.

[0064] According to the Darcy formula of fluid mechanics, the loss along the way is:

[0...

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Abstract

The invention discloses a prediction method for saturated and unsaturated permeability coefficients of deformed soil based on a fractal theory. The prediction method comprises the following steps: taking a soil-water characteristic curve of soil samples before deformation as a reference state, using a fractal model of the oil-water characteristic curve and fitting to obtain a fractal dimension D0 and an air entry value Psi a0 before the deformation, making the fractal dimension unchanged before and after the deformation, combining with a prediction model of the deformed air entry value to obtain a deformed air entry value Psi a, combining the deformed fractal dimension D0 and air entry value Psi a through a saturated/unsaturated relative permeability coefficient model, predicting the saturated permeability coefficient and an unsaturated relative permeability coefficient of the deformed soil, and multiplying the saturated permeability coefficient and the unsaturated relative permeability coefficient to obtain the unsaturated permeability coefficient. The prediction method for the saturated and unsaturated permeability coefficients of the deformed soil based on the fractal theory disclosed by the invention overcomes the defects that the prediction of the permeability coefficients is empirically based, thereby lacking theoretical support and having complicated calculation, and has the advantages of having extremely important values in seepage theories and fluid-solid coupling research and engineering application of saturated/unsaturated soil.

Description

Technical field [0001] The present invention relates to the technical field of saturated / unsaturated soil seepage analysis and hydraulic coupling research in geotechnical engineering, and more specifically is a method for predicting saturated and unsaturated permeability coefficients of deformed soil based on fractal theory. Background technique [0002] Research shows that quantitatively describing the influence of soil deformation on saturated / unsaturated permeability coefficients is the basis for establishing soil constitutive models that consider the interaction of hydraulic and mechanical properties, and conducting fluid-solid coupling analysis of unsaturated soils. Therefore, It is of great significance to establish the prediction method of saturated / unsaturated permeability coefficient of soil under deformation conditions. [0003] For the saturated permeability coefficient under deformation conditions, it is generally predicted by establishing an empirical relationship with...

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/08
Inventor 陶高梁吴小康孔令伟肖衡林马强李丽华叶建军陈银朱学良李进
Owner HUBEI UNIV OF TECH
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