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A Method for Determining Thermal Conductivity of Soil Minerals

A thermal conductivity and mineral technology, applied in the field of geothermal thermal parameter testing, can solve the problems of calculation result error, calculation accuracy and limited scope of application, and achieve the effect of concise calculation program, convenient calculation and intuitive calculation method.

Active Publication Date: 2021-07-20
DALIAN NATIONALITIES UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Application number 201710574906.8 uses Johansen's geometric mean method to give a method for calculating the thermal conductivity of soil minerals. Since Johansen is used in the calculation of thermal conductivity of multi-phase materials, the greater the difference in thermal conductivity between phases, the calculation The resulting error is larger, therefore, the calculation accuracy and scope of application of this method are limited

Method used

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  • A Method for Determining Thermal Conductivity of Soil Minerals
  • A Method for Determining Thermal Conductivity of Soil Minerals
  • A Method for Determining Thermal Conductivity of Soil Minerals

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Embodiment 1

[0019] The present invention proposes a method for determining the thermal conductivity of soil minerals, the method comprising the following steps:

[0020] (1) Determine the dry density ρ of saturated soil when the volume of soil and water account for 50% respectively according to formula (1) d , formula (1) is:

[0021]

[0022] In formula (1): ρ d is the dry density of saturated soil when the volume of soil and water account for 50%; d s is the density of solid matter in the soil, which is numerically equal to the relative density of the soil; V is the volume of the saturated soil;

[0023] (2) Calculate the moisture content w of the saturated soil when the soil-water volumes each account for 50% according to the formula (2), and the formula (2) is:

[0024]

[0025] In formula (2): w is the moisture content of saturated soil when the volume of soil and water account for 50%; d s is the density of solid-phase matter in the soil, which is numerically equal to the ...

Embodiment 2

[0031] Measure respectively that solid phase and water respectively account for 50% situation, the thermal conductivity of mica powder (solid phase) and water, gypsum powder (solid phase) and water, carbon powder (solid phase) and water mixture, in conjunction with method of the present invention and The method provided by patent 201710574906.8 estimates the thermal conductivity of mica powder, gypsum powder and carbon powder, and compares the estimated value with the measured value. The results are shown in Table 1.

[0032] Table 1 conventional method and the result comparison calculation of the inventive method

[0033]

[0034] It can be seen from Table 1 that the method of the present invention significantly improves the calculation accuracy of the patent 201710574906.8 method, and reduces the maximum error accuracy from 48.9% to 6.06%. The average prediction accuracy for the three tested materials decreased from 32.3% to 8.66%.

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Abstract

The invention relates to a method for determining the thermal conductivity of soil minerals, which belongs to the field of geotechnical thermal parameter testing. The main technical scheme is as follows: determine the dry density ρ of saturated soil when soil-water volumes account for 50% each d , to calculate the moisture content w of saturated soil when soil-water volumes account for 50% each, according to ρ d , w, prepare a cylindrical saturated soil sample, the net size of the mold used for the cylindrical saturated soil sample is 50mm×100mm in diameter×height; the thermal conductivity λ of the prepared saturated soil sample is measured by the probe method. The calculation method of the invention is intuitive and the calculation program is simple, and provides a means for determining the thermal conductivity of soil minerals. Through the relative error analysis of the calibration test, the calculation method reduces the maximum error of the traditional method from 48.9% to 6.06%. The improvement of accuracy can maximize the calculation accuracy of thermal parameters and provide convenience for the calculation of soil temperature field.

Description

technical field [0001] The invention belongs to the field of geotechnical thermal parameter testing, in particular to a method for determining the thermal conductivity of soil minerals. Background technique [0002] Soil is a multiphase body composed of solid matter, water and gas. The thermal conductivity of soil is often calculated based on the thermal conductivity of each phase in the soil and the volume content of each phase. The thermal conductivity of water and gas in soil can be determined by chemical methods. Solid phase matter in soil is the general name of solid phase particles in soil. It is composed of solid minerals and organic matter with different particle sizes and types. Common solid phase matter in soil There are quartz, feldspar, mica and so on. Therefore, in order to determine the thermal conductivity of the solid-phase material in the soil, it is necessary to determine the thermal conductivity and volume content of each component in the solid-phase mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/20
CPCG01N25/20
Inventor 高凌霞陈之祥郭晓霞李顺群姜蕾覃丽坤
Owner DALIAN NATIONALITIES UNIVERSITY
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