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A method and device for dynamically measuring soil porosity

A technology of dynamic measurement and measurement device, applied in the field of radiation detection, can solve the problems of soil particle density, labor and time-consuming, increase measurement data error, affect calculation accuracy, etc., achieve uniform force, improve accuracy, and avoid the effects of left and right shaking

Active Publication Date: 2020-12-29
HENGYANG NORMAL UNIV
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  • Description
  • Claims
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Problems solved by technology

In addition, determining the soil particle density of different soil textures is labor-intensive and time-consuming. Usually, the bulk density of the quartz sand sample is used as a typical reference value, which virtually increases the error of the measurement data.
[0004] Patent document CN107741391A discloses a method for measuring soil porosity, which uses the relationship between resistivity and soil porosity to obtain soil porosity by measuring soil resistivity. This method does not need to destroy the original soil during the sampling measurement process. With structure, the original density, water content and other elements of the soil can be preserved to the greatest extent, but this method still has complex calculations. It is necessary to establish a relationship model between soil porosity and soil resistivity, and the model is a rough estimation model. Introduced errors, affecting the calculation accuracy

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  • A method and device for dynamically measuring soil porosity
  • A method and device for dynamically measuring soil porosity
  • A method and device for dynamically measuring soil porosity

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Embodiment Construction

[0056] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0057] The invention provides a method for dynamically measuring soil porosity, which is characterized in that it includes a sampling process and a measurement and calculation process.

[0058] S1. Sampling process:

[0059] Utilize the steel ring knife 1-2 with the volume V of the ring knife handle 1-1 connected by thread to cut the soil in the natural state, so that the soil sample is filled therein. Do not shake from side to side, so that the natural structure of the soil is not damaged, until the ring knife 1-2 is completely pressed into the soil. Then dig out the ring cutter 1-2 from the soil with a small shovel, take off the ring cutter handle 1-1, and carefully trim and level off the edges of the ring cutter 1-2 two ends with a knife to remove excess soil.

[0060] After the trimming is completed, cover the upper end of the sampled rin...

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Abstract

The invention provides a method and device for dynamically measuring soil porosity. A closed-loop gas path is utilized for measuring the change rule of radon concentration in the device, the changes of the radon concentration in the device at different measuring volumes are obtained by changing the volume of the measuring device, and the soil porosity can be calculated. The effective decay constant of radon is considered when the change rule of the radon concentration in the measuring device is measured and comprises the decay constant, the leakage coefficient and the inverse diffusion coefficient of radon, the accurate soil porosity eta can be calculated, and the measuring precision is high. According to the method and device, the values of n measuring periods in the measuring device aresubjected to nonlinear fitting, it is not needed that the radon concentration in the device is stable, the measuring time is saved, the sampling measuring process and the calculating method are simple, the measuring difficulty is reduced, and the measuring cost is reduced.

Description

technical field [0001] The invention relates to a radiation detection technology, in particular to a method and device for dynamically measuring soil porosity. Background technique [0002] Soil porosity is the ratio of the volume of pores between soil particles to the total volume of soil. Soil porosity is an important index reflecting soil properties. In the prior art, there are empirical calculation method, mercury intrusion method, soil bulk density and specific gravity calculation method, image processing method and volume difference calculation method to measure soil porosity, but all of them have certain limitations, and the measurement accuracy is not high. The obtained data has large errors and complex operations. [0003] The empirical calculation method is converted from other soil indicators (natural weight, water content, relative density of soil particles, water weight), most of the indicators (natural weight, water content, relative density of soil particles...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
CPCG01N15/088
Inventor 谭延亮袁红志
Owner HENGYANG NORMAL UNIV
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