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Calculation method of unfrozen water content in frozen soil based on clay colloidal chemical electric double layer theory

A technology of colloid chemistry and electric double layer, which is applied in the direction of measuring devices, scientific instruments, and material analysis through electromagnetic means, and can solve problems such as inability to apply soil and large limitations of empirical formulas

Active Publication Date: 2019-01-04
NORTHWEST INST OF ECO ENVIRONMENT & RESOURCES CAS
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Problems solved by technology

In addition, the unfrozen water calculation model based on the above experimental methods can only calculate the unfrozen water experiments on soils, such as Moling clay, Northwest silt, etc., and cannot be applied to unfrozen water experiments. The experimental soil, obviously, the limitations of the empirical formula are very large

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  • Calculation method of unfrozen water content in frozen soil based on clay colloidal chemical electric double layer theory
  • Calculation method of unfrozen water content in frozen soil based on clay colloidal chemical electric double layer theory
  • Calculation method of unfrozen water content in frozen soil based on clay colloidal chemical electric double layer theory

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Embodiment Construction

[0086] Due to the electrostatic force of the negative charge on the surface of the clay particles, the particle surface diffusion layer (that is, the ion-containing solution layer close to the particle surface) is essentially a cationic solution layer. The distribution of the ionic solution has a special structure, close to the particle surface, the ion concentration is high, far away from the particle surface concentration is low, the higher the concentration of the cationic solution, the lower the freezing temperature, and the unfrozen ionic solution is unfrozen water. Since the thickness of the cationic solution is very small compared with the surface area of ​​the clay particles, the surface of the clay particles is assumed to be an infinite plane in the actual calculation process, and the ionic solution is replaced by a salt solution of the same concentration. According to the above assumptions, the electric double layer theory is introduced into the theoretical derivation...

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Abstract

The invention relates to a method for calculating unfrozen water content in frozen soil based on a theory of a clay colloidal chemical electric double layer, which comprises the following steps: (1) soil sample is collected, a particle analysis experiment is performed to determine the mass percentage of clay, silt and sand in soil; (2) a specific surface area A (i) S ( / i) of the soil is obtained;(1) the concentration of the cation solution at the diffusion layer thickness x is obtained; (2) the unfrozen water content is obtained. Based on the electrostatic field Poisson equation and the electric double layer theory distributed by the electrostatic charge Boltzmann distribution, a theoretical formula of the unfrozen water content is derived, an empirical formula of the measured data and the existing unfrozen water content are finally combined, the theoretical formula of the unfrozen water content of conventional frozen soil with independent variables of soil type (specific surface area) and temperature is given. By the method and the device, the unfrozen water content of any conventional frozen soil can be calculated, the calculation is convenient, the effect is clear, and the influence factor is clear.

Description

technical field [0001] The invention relates to the technical field of frozen soil engineering, in particular to a method for calculating unfrozen water content in frozen soil based on a clay colloid chemical electric double layer theory. Background technique [0002] Frozen soil is a soil with a temperature below 0°C and contains ice. After the soil freezes, not all liquid water is transformed into solid ice. Due to capillary action and particle surface energy, a certain amount of liquid water is always maintained in the soil. called unfrozen water. Due to the different density of ice water, the change of unfrozen water content will cause frost heaving or thawing of frozen soil, which will have a great impact on the physical and mechanical properties of frozen soil, such as structure, strength and stress-strain. It is related to all aspects of human production and life in permafrost areas, such as agriculture, engineering construction, mineral exploration and climate chang...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/00
CPCG01N27/00
Inventor 杨文靳潇高晓清
Owner NORTHWEST INST OF ECO ENVIRONMENT & RESOURCES CAS
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