Mesoscale Research Method of Equivalent Permeability Coefficient of Multiphase Composites

A composite material and equivalent permeation technology, which is applied in the field of research on the properties of multiphase composite materials, can solve problems such as the inability to reflect the seepage mechanism of fluid flow conditions, and the inability to obtain the general law of seepage, so as to achieve simple and clear calculation principles and strong operability , The effect of simple calculation principle

Active Publication Date: 2021-03-16
WUHAN UNIV
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Problems solved by technology

For example, the fractal model is used to evaluate the permeability coefficient, but this method cannot reflect the flow of fluid in the material and the seepage mechanism; the real internal structure of the material is reconstructed by CT scanning technology, and this method can simulate the interior of the material more realistically composition, but it is only applicable to a specific material, and the general law of seepage cannot be obtained; some scholars determine the permeability coefficient according to the matrix suction value of the SWCC experiment; or propose an empirical formula suitable for a certain soil, such as the classic Terzaghi formula, Hazen formula, Kozeny-Carman formula, etc., but these methods are not suitable for multiphase composite materials with strong heterogeneity and large difference in permeability coefficient of each phase

Method used

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  • Mesoscale Research Method of Equivalent Permeability Coefficient of Multiphase Composites
  • Mesoscale Research Method of Equivalent Permeability Coefficient of Multiphase Composites
  • Mesoscale Research Method of Equivalent Permeability Coefficient of Multiphase Composites

Examples

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Embodiment 1

[0055] In this example, according to the research method of the equivalent permeability coefficient of the multiphase composite material proposed in the present invention, the effect of the spatial arrangement of the dispersed phase on the permeability coefficient of the multiphase composite material is explored. Specific steps are as follows:

[0056] (1) Determine the attributes of the research object.

[0057] ① Determine the geometric size

[0058] The simulated sample size is 100mm×100mm. Each dispersed phase is regarded as a circle with a radius of 5-20 mm, randomly distributed in the matrix and not in contact with each other.

[0059] ② Determine the volume fraction of each phase: the volume fraction of the dispersed phase is 60%, and that of the matrix phase is 40%.

[0060] ③ Determine the material parameters of each phase

[0061] The permeability coefficients of each phase are respectively: the permeability coefficient of the dispersed phase is 5×10 -3 m / s, the...

Embodiment 2

[0084] In this example, according to the research method of the equivalent permeability coefficient of the multiphase composite material proposed by the present invention on a mesoscopic scale, the effect of different permeability coefficient ratios of each component on the permeability coefficient of the multiphase composite material is explored.

[0085] Specific steps are as follows:

[0086] (1) Determine the attributes of the research object.

[0087] ① Determine the geometric size

[0088] The simulated sample size is 100mm×100mm. Each dispersed phase is regarded as a circle with a radius of 5-20 mm, randomly distributed in the matrix and not in contact with each other.

[0089] ② Determine the volume fraction of each phase: the volume fraction of the dispersed phase ranges from 0-65%.

[0090] ③ Determine the material parameters of each phase

[0091] The permeability coefficients of each phase are respectively: the matrix phase is soil body, and its permeability co...

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Abstract

The invention relates to an equivalent permeability coefficient mesoscopic scale research method of a multiphase composite material. Aiming at the heterogeneous characteristics of the composite material, a numerical model is established based on a finite element method from a mesoscale perspective so as to estimate the equivalent permeability coefficient of the composite material. The establishednumerical model is simulated through a Monte Carlo algorithm, a multi-phase material structure with spatial randomness under the mesoscopic scale is obtained, and the equivalent permeability coefficient of the composite material is evaluated in combination with a finite element calculation method and the Darcy law. Starting from the mesoscopic scale, the invention provides the method capable of simulating the heterogeneity of the internal structure of the multi-phase composite material, a new thought is provided for analyzing the permeability of the multi-phase composite material, and the simulation method is simple, feasible, rapid and convenient.

Description

technical field [0001] The invention belongs to the field of multiphase composite material characteristic research, in particular to a kind of multiphase composite material equivalent permeability coefficient mesoscale research method. Background technique [0002] Seepage properties are the ability of a material to allow liquid to pass through its interconnected pores, and strength and deformation properties are relatively important physical and mechanical parameters of rock and soil materials. Seepage characteristics will cause seepage problems such as reservoir dam instability and affect engineering benefits; on the other hand, it will bring seepage and stability problems, such as water gushing and flowing soil, which will lead to landslides or foundation pit collapse. In general, permeability can be characterized by hydraulic coefficients, also known as hydraulic properties. [0003] At present, the determination of the permeability coefficient of materials is mainly re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
CPCG01N15/08
Inventor 刘勇李凯奇李典庆
Owner WUHAN UNIV
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