Abstract
The main object of this study is to clarify the strength and deformation characteristics of mudstone deposited during the Tertiary Period, which is widely distributed in Japan, for the wide range of effective confining pressure σ′m (=294kPa-5880kPa) during cyclic loading. It is found that degradation of shear strength according to increase of the number of cycles is relatively small in comparison with that of soft soils. Shear strength mobilized at irregular cyclic loading tests using actual earthquake acceleration records is about 110%-120% of that obtained by monotonous loading tests, and the relation between shear modulus G and σ′m at small strain level is expressed by two straight lines with breaking points, which is given σ′m equivalent to consolidation yield stress, in the log scale paper.
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