Method of Determining Unfrozen Water Content in Soil Freezing Process Using Specific Heat Calculation

Abstract

The invention provides a method for determining the unfrozen water content in the process of soil freezing by using specific heat calculation. The method uses the total heat of a certain temperature measuring point as soil particle heat, pore water heat, pore ice heat and water in soil through the following steps The sum of the four parts of the heat released by the phase change; use the indoor geotechnical test to measure the physical properties of the soil sample, and determine the phase change temperature range of the soil sample by the freezing test; divide according to the specified temperature interval, use the mixed calorimetry method, and measure it with a calorimeter The specific heat of the frozen soil corresponding to the temperature measuring point; use the specific heat to express the heat of four parts and the total heat, deduce the functional relationship between the unfrozen water content and the specific heat, and then calculate the unfrozen water content of each temperature measuring point. The beneficial effect is that the method is simple to measure the unfrozen water content, and the error of the test result is small. General laboratories and construction units can use simple calorimeter measurement to calculate the unfrozen water content.

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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