Abstract
Pseudo-dynamic tests were conducted to investigate the response properties of saturated sands focusing on the pore water pressure subjected to horizontal one-directional and two-directional earthquake waves. The apparatus was simple shear test device incorporating two cyclic loaders. Firstly, the major axis direction was studied by typical strong motion records of Tail and Hachinohe, and secondly, the response properties of model soil profiles were compared subjected to two-directional and one major axis inputs by adding three earthquake waves with different frequency contents. The results show the following significant features. 1) In case of the evaluation of the liquefaction potential, the major axis direction can not evaluate by the characteristics of input earthquake motion only, but it is necessary to consider the predominant period of surface layers. 2) The maximum response values of acceleration, velocity and displacement of soils and frequency contents show little different both in the case of two-directional and one major axis inputs. 3) However, it is necessary to modify the maximum amplitude of earthquake waves in major axis in the evaluation of pore water pressure ratio.
