Method for determining content of unfrozen water in three-dimensional pores of frozen soil under freezing and thawing cycle

By monitoring changes in frozen soil temperature and calculating the radius of curvature of capillary water bends, the content of unfrozen water in the three-dimensional pores of frozen soil is determined. This solves the problems of cumbersome calculations and low accuracy in existing technologies, and enables rapid and accurate calculation of the unfrozen water content in frozen soil and its auxiliary application in groundwater detection in frozen soil areas.

CN120908418AActive Publication Date: 2025-11-07JILIN UNIVERSITY
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Patent Information

Application Number
CN202511439187.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-10-10
Publication Date
2025-11-07
Estimated Expiration
2045-10-10

AI Technical Summary

Technical Problem

Existing methods for determining the unfrozen water content in permafrost suffer from cumbersome calculations and low accuracy, especially since they do not consider the geometric relationship between pores and the unfrozen water system, as well as interference from external factors.

Method used

By monitoring the temperature changes of frozen soil samples in real time and calculating the radius of curvature r of the capillary water bend, three unfrozen water states were identified. The corresponding formulas for calculating the unfrozen water content were adopted, taking into account capillary action and adsorption, to establish a quantitative relationship between the unfrozen water content and temperature, medium size, and pore size.

Benefits of technology

It enables rapid and accurate calculation of the unfrozen water content in permafrost, improving calculation efficiency and accuracy, and assisting in groundwater geophysical exploration in permafrost areas.

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Abstract

The invention is suitable for the technical field of frozen soil engineering, and provides a method for determining the content of unfrozen water in three-dimensional pores of frozen soil under freezing and thawing circulation. According to the method, a frozen soil thawing process under a freezing and thawing cycle condition is focused, the adsorption effect and the capillary effect of water are combined, based on a three-dimensional pore structure, the quantitative relation between the unfrozen water content and the temperature, the medium size and the pore size is established, the change of the unfrozen water content is divided into three states, and an expression equation is deduced by combining a microscopic geometrical relation for each state; when the values of variables such as the temperature, the medium size and the pore size are known, the unfrozen water content can be quickly and accurately determined by judging the state of the unfrozen water and substituting the state into the corresponding equation, and the calculation efficiency and accuracy are effectively improved. The method not only provides a new thought for characterizing the unfrozen water content of the frozen soil in the freezing and thawing cycle process, but also can assist the geophysical prospecting work of the underground water in the frozen soil region, and especially has important application value for detecting the underground water content in the frozen soil region by using a magnetic resonance technology.
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