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A Prediction Method of Saturated/Unsaturated Permeability Coefficient Based on Microscopic Pore Channels

A technology of permeability coefficient and micro-porosity, applied in permeability/surface area analysis, measurement device, suspension and porous material analysis, etc., can solve the problem of slow progress of research work, and achieve the effect of simplifying related calculations

Active Publication Date: 2019-05-03
HUBEI UNIV OF TECH
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Problems solved by technology

[0004] Therefore, the new model is worthy of research, but the research work in this area has progressed slowly in recent years

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  • A Prediction Method of Saturated/Unsaturated Permeability Coefficient Based on Microscopic Pore Channels
  • A Prediction Method of Saturated/Unsaturated Permeability Coefficient Based on Microscopic Pore Channels
  • A Prediction Method of Saturated/Unsaturated Permeability Coefficient Based on Microscopic Pore Channels

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Embodiment Construction

[0068] The invention discloses a method for predicting saturated / unsaturated permeability coefficient based on microscopic pore channels. The method has been verified by different experimental data, and the measured and predicted structures can be well matched, so that the practicability and reliability of the present invention can be obtained. fully verified.

[0069] Concrete implementation method of the present invention is:

[0070] First, a microscopic pore channel seepage model is proposed: the soil is composed of a large number of connected pore channels, such as figure 1 As shown, the equivalent pore diameters of these interconnected pore channels are different. When the matrix suction is small, the pore channels with larger equivalent pore diameters drain first (such as figure 1 Large pore channels in the medium), channels with smaller equivalent pore diameters are still full of water (such as figure 1 large pore channels and small pore channels), and these channels...

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Abstract

The invention relates to a micropore channel-based saturated / unsaturated osmotic coefficient forecasting method, which comprises the following steps: on the basis of a micro-connected channel seepage model and the capillary theory, building a model for forecasting a saturated / unsaturated osmotic coefficient through soil-water characteristic curves; obtaining the soil-water characteristic curve and a saturated osmotic coefficient of soil through a pressure plate apparatus and a varying head test; calculating a comprehensive osmotic ratio constant kc by using the model of the saturated osmotic coefficient; performing n equal division according to the comprehensive osmotic ratio constant kc of a certain type of soil and the actually measured soil-water characteristic curve, and calculating a saturated osmotic coefficient ks and an unsaturated relative osmotic coefficient kr of the type of soil by using the relevant model; multiplying the saturated osmotic coefficient ks and the unsaturated relative osmotic coefficient kr, thus obtaining an unsaturated osmotic coefficient kw. From a microscopic view, the method disclosed by the invention has an important significance for revealing an internal mechanism for controlling the size of an osmotic coefficient of the soil, analyzing seepage of unsaturated soil and researching hydromechanical coupling.

Description

technical field [0001] The present invention relates to a method for predicting saturated / unsaturated permeability coefficients based on microscopic pore channels, in particular to a method for predicting permeability coefficients based on microscopic pore channels. Based on the SWCC curve (SWCC), it is an effective calculation method for predicting the saturated or unsaturated permeability coefficient of the soil. Background technique [0002] Soil-Water Characteristic Curve (SWCC for short) is a curve describing the relationship between suction and water content in unsaturated soil. The soil-water characteristic curve can reflect the size and distribution of pores in the soil. The permeability coefficient, also known as the hydraulic conductivity coefficient, is defined as the unit flow rate passing through the unit hydraulic gradient, and is an important indicator to describe the permeability of the soil. At present, the saturated permeability coefficient is generally pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
CPCG01N15/082
Inventor 陶高梁吴小康孔令伟肖衡林马强李丽华叶建军甘世朝陈银朱学良
Owner HUBEI UNIV OF TECH
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