冻结粉质黏土声学特性与物理力学性质试验研究

doi:10.13722/j.cnki.jrme.2014.1248

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Abstract In order to study the relationship between acoustic characters of frozen silty clay and its physics mechanics properties，ultrasonic tests of frozen silty clay were conducted，and measured its tensile and compressive strength under various negative temperatures. The influence of temperature，water content and dry density on ultrasonic wave velocity and the relationship between wave velocity and strength of frozen silty clay were analyzed base on the tests. Test and analysis results indicated that，ultrasonic wave velocity rapidly changes in the temperature range of -1℃ to -7℃. There exists critical water content and the value is 16.03%. Ultrasonic wave velocity increases firstly and then decreases with an increase of water content. Under the same water content，wave velocity increases linearly with an increase of dry density. Three dynamic elastic mechanical parameters of frozen silty clay were obtained from the measured wave velocities and specimen densities based on elastic theory and its change trends with temperature was analyzed. There exist good correlations between ultrasonic wave velocity and strength of frozen silty clay. The larger the strength and the faster the wave will be. It is found that the ultrasonic test technique can be used to test frozen soils nondestructively and lay the foundation for the prediction of frozen soil strength.

Key words： ultrasonic wave velocity temperature critical water content dynamic elastic mechanical parameters frozen soil strength
(in Chinese))

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2014.1248 OR http://www.rockmech.org/EN/Y2015/V34/I07/21

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