Soil Effective Pore Size and Its Distribution Parameters Test Method

A technology of effective pore size and distribution parameters, applied in the field of quantifying soil pores and their distribution, can solve problems such as difficult to grasp soil mesoscopic pore structure, and achieve the effect of low testing cost and simple operation

Active Publication Date: 2017-09-08
JIANGXI UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

The drying method has the advantages of simple operation and low test cost, but it is difficult to grasp the mesoscopic pore structure inside the soil. For this reason, researchers proposed mercury injection method, semi-permeable partition method, centrifuge method, dynamic displacement method, gas adsorption method, etc. method, suspension filtration method, etc.

Method used

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  • Soil Effective Pore Size and Its Distribution Parameters Test Method
  • Soil Effective Pore Size and Its Distribution Parameters Test Method
  • Soil Effective Pore Size and Its Distribution Parameters Test Method

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Embodiment Construction

[0046] The present invention is used to test the effective pore size and distribution parameters of a soil sample of an ionic rare earth mine in Gannan, Jiangxi.

[0047] Step 1: Test the void ratio and permeability coefficient of the soil sample

[0048] In an ion-type rare earth mine in Gannan, Jiangxi, the soil permeability coefficient was tested on-site by the double-ring method to be 1.36×10 -6 m / s, a total of 8 samples were taken on site with a ring knife, and the density and water content of the soil samples were tested. The average density of the soil samples obtained from the test was 1530kg / m 3 And the water content is 15.3%, and the particle density of the soil sample obtained by the test is 2680kg / m 3 , the void ratio of the soil sample was calculated as 0.96 using the relational formula 1.

[0049] Relationship 1

[0050]

[0051] In relational formula 1, e is the void ratio of the soil sample, d s is the relative density of soil sample particles, ρ w is the...

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Abstract

The invention relates to a method for testing soil effective pore size and distribution parameters thereof, which is suitable for quantifying soil pores and their distribution. The present invention includes steps: Step 1: test the void ratio and permeability coefficient of the soil sample; Step 2: test the pore tortuosity of the soil sample; Step 3: test the penetration curve of the soil sample; Step 4: Calculate the maximum effective radius and the minimum effective radius of the pores of the soil sample; Step 5: Calculate the average effective pore size of the soil sample; Step 6: Calculate the pore size distribution parameters of the soil sample. The method for testing the effective pore size and distribution of soil samples has the advantages of simple operation and low testing cost; the invention analyzes the soil pore size and distribution based on the penetration curve of water in the soil sample, and can avoid the influence of dead-end pores on the test results; Compared with the mercury intrusion method, the soil sample volume is larger, and the test results can effectively reflect the macroscopic parameters of the soil.

Description

technical field [0001] The invention relates to a method for testing soil effective pore size and its distribution parameters, which is suitable for quantifying soil pores and its distribution. Background technique [0002] The soil pore structure has a crucial influence on the seepage process, deformation and failure behavior of the soil, and is often used to explore the mechanical mechanism of the soil, and to explain and predict the macroscopic behavior of the soil, such as soil macropores It is a key factor that causes preferential flow, solute migration, groundwater pollution, nutrient loss and irrigation water waste. Existing research results show that: the existence of large pores increases the saturated hydraulic conductivity of soil several times, and contributes to the total infiltration The ratio can reach 85%, especially the pores with a diameter greater than 1.0mm are important factors affecting the conduction of water flow. [0003] The hydrodynamic properties...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
Inventor 王观石胡世丽洪本根罗嗣海
Owner JIANGXI UNIV OF SCI & TECH
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