Method for determining content of unfrozen water in soil freezing process by using specific heat calculation

Abstract

The invention provides a method for determining the content of unfrozen water in a soil freezing process by using specific heat calculation. The method comprises the following steps: adopting the total heat of one temperature measuring point as the sum of soil particle heat, pore water heat, pore ice heat and heat released by phase change of water in soil; determining the physical properties of a soil sample by using indoor geotechnical test, and determining the phase change temperature range of the soil sample through freezing test; determining the specific heat of frozen heat at the corresponding temperature measuring point by using a calorimeter through mixed calorimetry; and expressing the four heats and the total heat by using the specific heat, deriving the unfrozen water content-specific heat function relation, and calculating to obtain the content of the unfrozen water at every temperature measuring point. The method for measuring the content of the unfrozen water has the advantages of simple operation and small test result error. General labs and construction units can use a simple calorimeter to measure and calculate the content of the unfrozen water.

Description

technical field [0001] The invention mainly relates to the field of civil engineering and geotechnical engineering, specifically a method for determining the unfrozen water content in the process of soil freezing by using the specific heat calculation considering the latent heat of water phase change in soil, which is mainly used in natural frozen soil and artificial frozen soil. Determination of frozen water content. Background technique [0002] Since the middle of the 20th century, many countries have taken the development of underground space as a national policy and achieved remarkable results. my country is also paying more and more attention to the development and utilization of underground space. With the rapid development of my country's social economy, underground engineering construction is expanding to deeper and more difficult conditions, and the number of difficult geological conditions rich in water is increasing, which provides a broad space for the applicat...

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Problems solved by technology

[0007] The main problems of the above unfrozen water determination methods are cumbersome operation, large error, expensive equipment, long test time and the need for professional testers, etc.

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