非線形挙動をする表層地盤内における地震時応力

Abstract

This paper deals with the non-linear seismic responses of near-surface ground at several strongmotion recording sites by adopting the characteristic curve method. In the analysis, the hyperbolictype stress-strain relationship is employed, in which the property of soil is represented by twoparameters for the full range of strain. These parameters are determined from the soil profiles atthe respective sites.The effects of the non-linear behavior of soil are examined by the comparison of the stress andstrain distributions beneath the ground surface with those obtained by the linear analyses.The results of numerical computations reveal that the maximum shear strain induced in the sub-surface ground is dependent of the non-linear characteristics of soil for the near-surface ground andthat, in the contrary, the shear stress distributions with depth is not significantly different from thosefor the linear system for the first 10 to 20 meters from the ground surface.