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Characteristics of Elastic Waves in Sand-Silt Mixtures due to Freezing  

Park, Junghee (고려대학교 건축사회환경공학부)
Hong, Seungseo (한국건설기술연구원)
Kim, Youngseok (한국건설기술연구원)
Lee, Jongsub (고려대학교 건축사회환경공학부)
Publication Information
Journal of the Korean GEO-environmental Society / v.13, no.4, 2012 , pp. 27-36 More about this Journal
Abstract
The water in surface of the earth is frozen under freezing point. The freezing phenomenon, which causes the volume change of soils, affects on the behavior of soils and causes the significant damage on the geotechnical structures. The purpose of this study is to investigate the characteristics of elastic waves in sand-silt mixtures using small size freezing cells, which reflect the frozen ground condition due to temperature change. Experiments are carried out in a nylon cell designed to freeze soils from top to bottom. Bender elements and piezo disk elements are used as the shear and compressional wave transducers. Three pairs of bender elements and piezo disk elements are placed on three locations along the depth. The specimen, which is prepared by mixing sand and silt, is frozen in the refrigerator. The temperature of soils changes from $20^{\circ}C$ to $-10^{\circ}C$. The velocities, resonant frequencies and amplitudes of the shear and compressional waves are continuously measured. Experimental results show that the shear and compressional wave velocities and resonant frequencies increase dramatically near the freezing points. The amplitudes of shear and compressional waves show the different tendency. The dominant factors that affect on the shear wave velocity change from the effective stress to the ice bonding due to freezing. This study provides basic information about the characteristics of elastic waves due to the soil freezing.
Keywords
Compressional waves; Elastic wave amplitude; Resonant frequency; Soil freezing; Shear waves;
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