Effective soil pore diameter and distribution parameter testing method

A technology of effective pore size and distribution parameters, which is applied in the field of quantifying soil pores and their distribution, and can solve problems such as difficulty in grasping soil mesopore structure.

Active Publication Date: 2015-12-09
JIANGXI UNIV OF SCI & TECH
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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 ...

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  • Effective soil pore diameter and distribution parameter testing method
  • Effective soil pore diameter and distribution parameter testing method
  • Effective soil pore diameter and distribution parameter testing 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] e = d s ρ w ...

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Abstract

The invention relates to an effective soil pore diameter and distribution parameter testing method. The method is applicable to quantifying soil pores and distribution of the soil pores. The method comprises the steps that firstly, the porosity and permeability coefficients of a soil sample are tested; secondly, the pore tortuosity of the soil sample is tested; thirdly, a breakthrough curve of the soil sample is tested; fourthly, the maximum effective radius and the minimum effective radius of the pores of the soil sample are calculated; fifthly, the average effective pore diameter of the soil sample is calculated; sixthly, the pore diameter distribution parameters of the soil sample are calculated. The effective pore diameter and distribution of the soil sample are tested, operation is easy, and the testing cost is low; on the basis of the breakthrough curve of the soil sample on water, the soil pore diameter and distribution are analyzed, and the influence of dead end pores on a testing result can be avoided; compared with a mercury intrusion method, the size of the soil sample is large, and the test result can effectively reflect macro parameters of 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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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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