Device and method for measuring unfrozen-water content of soil body

Abstract

The invention discloses a device and method for measuring the unfrozen-water content of a soil body. The device for measuring the unfrozen-water content of a soil body comprises a THz-TDS system, a sample mould system for loading a soil sample, a temperature control system for adjusting the soil sample temperature and a data acquisition system for acquiring the measured data of the soil sample, wherein the THz-TDS system comprises a beam splitter, a THz transmitter, a THz receiver and multiple reflectors; and the beam splitter splits laser into two beams, one for irradiating the THz transmitter to generate THz pulse, and the other one serving as probe light to pass through the THz receiver together with the THz pulse passing the soil sample. The measuring device disclosed by the invention has the characteristics of high precision, real-time property and easiness in operation.

Description

technical field [0001] The invention relates to a soil unfrozen water content measurement device and a measurement method, belonging to the field of soil unfrozen water content measurement. Background technique [0002] The measurement of unfrozen water content is an important and difficult problem in the scientific research of frozen soil. Under negative temperature conditions, only part of the water in the soil undergoes phase transition and freezes, thus forming a four-phase soil of water, ice, air, and soil particles. Under negative temperature conditions, the content of water and ice has an important influence on the thermal and mechanical properties of frozen soil. It is a necessary index for thermal engineering calculation of frozen soil, and it is the leading factor in the change of mechanical properties of frozen soil. Therefore, the test and research of unfrozen water content in frozen soil have important research value and significance for the basic thermal and m...

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Problems solved by technology

[0004] According to the analysis of domestic and foreign literature on unfrozen water testing methods, the calorimetric method is a traditional classic method with simple principle, high precision and good stability, but the operation and calculation of this method are cumbersome and complicated.

Computer tomography identification technology and nuclear magnetic resonance method are time-consuming and labor-intensive, and most of the research is still in the exploratory stage, which cannot be effectively implemented, and will also cause radiation damage to the human body

The time domain reflectometer method determines the unfrozen water content by measuring the dielectric constant of the soil layer. This method has the characteristics of fast speed, low price, and portability. However, the dielectric constant of the soil is easily affected by physical factors such as soil quality, temperature, and weight. Impact

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