Author(s): Shinji Kioka; Yuko Matuo; Hirofumi Kondo; Yasuji Yamamoto; Hiroshi Saeki
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Abstract: A simplified unconsolidated layer model was produced, and a series of experiments was carried out under the various conditions in addition to our past experiments. Shear strength satisfied the Coulomb failure criterion without exception in our experiment. We found that although an initial porosity and failure mode of a specimen (unconsolidated layer model) depended on shape of ice block/piece which constitutes a specimen, the shear strength (strength parameters) depended not on block shape but on block volume. There is a tendency for the strength parameters such as internal friction angle and cohesion to increase as the block size increased. However, the increase in internal friction angle deceases as the block size increases, and the internal friction angle seems to approach a constant value over time. The strength parameters are not thought to depend much on whether blocks are submerged. This means that it is possible to perform experiments under easier setup of dry conditions. We also found that the shear strength depended largely on the shear rate.
Year: 2004