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,             .       -             .            60% 80%     .       1    .         , , ,       . ,       ,  -    .    B-value    1800 m/s  ,      .    B-value   ,        .     -    ,      -     .   -                . :  , ,  ,  ,  For accurate laboratory evaluations of soil deposits, it is essential that the samples are undisturbed. An artificial ground-freezing sys-tem is the one of the most effective methods for obtaining undisturbed samples from sand deposits. The objective of this study is to esti-mate the shear strengths and the characteristics of elastic waves of frozen-thawed and unfrozen specimens through the undrained triaxialcompression test. For the experiments, Jumunjin standard sands are used to prepare frozen and unfrozen specimens with similar relativedensities (60% and 80%). The water pluviation method is used to simulate the fully saturated condition under the groundwater table.When thawing the frozen specimens, the temperature is measured every minute. After the specimens are completely thawed, undrainedtriaxial compression tests are conducted using the same procedures as for the unfrozen specimens. During the triaxial tests (saturation,consolidation, and shear phase), compressional and shear waves are measured. The results show that the freeze-thaw process has minoreffects on the peak deviatoric stress and shear strength values, and that the process does not affect the internal friction angle. The com-pressional wave velocity increases with increasing B-value to 1800 m/s in the saturation phase, but tends to remain constant in the pro-cess of consolidation and shearing. The shear wave velocity decreases with increasing B-value in the process of saturation, but changesvelocity in accordance with the change in effective stress in the processes of consolidation and shearing. The compressional wave veloc-ity has similar values regardless of the freeze-thaw process, but values of shear wave velocity are slighly lower in frozen-thawed spec-imens than in unfrozen specimens. This study is a preliminary experiment for estimating the shear strength and characteristics of elasticwave velocity in undisturbed frozen specimens that have been obtained using the artificial ground-freezing method.Key words :Artificial ground freezing, Elastic wave velocity, Shear strength, Thawing, Triaxial compression test*Corresponding author: changho@jnu.ac.kr

Characteristics of Shear Strength and Elastic Waves in Artificially Frozen Specimens using Triaxial Compression Tests