Method for measuring soil suction according to light reflection theory

A technology of soil suction and light reflection, applied in the field of measuring soil suction, can solve the problems of inability to measure the range of soil suction, high cost of interference, and achieve the effect of no intrusion, damage, disturbance, low cost, and improved applicable range.

Active Publication Date: 2018-04-24
SHANTOU UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, none of these instruments can measure the range of suction created in the soil
All conventional instruments that have been developed are intrusive and costly, and assess suction in depressed areas (only about 1% of the area)

Method used

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  • Method for measuring soil suction according to light reflection theory
  • Method for measuring soil suction according to light reflection theory
  • Method for measuring soil suction according to light reflection theory

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Embodiment

[0036] A method for measuring soil suction using light reflection theory, such as Figure 5 As shown, it mainly includes the following steps:

[0037] Step S1: According to the brightness difference between dry soil and wet soil. The basis for soil suction measurements using color analysis techniques was thus established. The reflection phenomenon in dry and wet soil is shown in Fig. 1. Light passes from one medium to another at the air-moisture interface. When light strikes an air-moisture interface, it undergoes both reflection and refraction. Light cannot enter the soil particles because soil is an opaque medium. Therefore, no refraction occurs at the air-soil interface. Therefore, a major part of the incident light comes from dry soil such as Figure 1a shown. Due to this phenomenon, dry soil appears brighter. In the case of wet soil, where light passes from air into water, refraction is observed at the air-moisture interface as Figure 1b shown. This refracted r...

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Abstract

The invention discloses a method for measuring soil suction according to a light reflection theory. The method mainly includes: (1) adopting the light reflection theory for measuring soil saturation degrees to distinguish dry soil and wet soil, and carrying out the next step if wet soil is determined; (2) selecting saturation degrees from a soil-water characteristic curve; (3) selecting dry density from an actual measurement solid-line curve; (4) compacting soil for measurement in a mould to the dry density selected in the step (3) and the corresponding saturation degree, and adopting a camerafor taking pictures; (5) quantifying images obtained in the step (4) by gray levels according to gray values; (6) analyzing average gray value variation conditions to find out a relationship betweenthe saturation degrees and the gray values. The method is a novel low-cost direct color analysis technique free of intrusion disturbance and applied to canal embankment, expressway and runway roadbeds, filling liners, earth dams and the like, limitations of common instruments for measuring suction of farmland and rock-soil base facilities are avoided, and an application range is expanded.

Description

technical field [0001] The invention relates to a method for measuring soil suction, in particular to a method for measuring soil suction by using light reflection theory. Background technique [0002] Soil suction is the result of the complex energy states formed by the solids, water and air in the soil. Soil suction is the energy required to extract a unit volume of water from the soil. Compared to saturated soils, unsaturated soils react very briefly due to the presence of suction. When the DOS of the soil reaches dry density, it represents suction. The graph between suction and DOS is called SWCC. Suction determines the hydraulic conductivity and mechanical strength of canal embankments, highway and airstrip embankments, landfills, earth dams, and agricultural fields. A number of instruments have been developed to measure suction, and they work in different ways. The methods used for soil suction measurement include thermocouple hygrometer, transistor psychrometer, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/55
CPCG01N21/55G01N2021/555
Inventor 李安王钦华魏倪施娃
Owner SHANTOU UNIV
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