Study on passive control of earth structure by introducing material anisotropy

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By introducing material anisotropy and heterogeneity in soil structure, rigidity and strength of the ground can be modified so that intended deformation pattern during earthquakes may be achieved. To investigate basic characteristics of the ground material, dry sand is tested through hollow cylindrical cyclic shear tests and small model tests of embankments. The investigation is focused on studying structural anisotropy by varying formation of sand specimen, i.e., flat bed and inclined bed against shear. (1) From the cyclic shear tests, regardless of the relative density of sand, the maximum shear resistance of sand was obtained when the specimen is formed as dip slope. (2) After the model test, embankment constituted of dip slope showed maximum resistance to dynamic force.