PROPOSAL OF ONE-DIMENSIONAL DYNAMIC RESPONSE ANALYSISMETHOD OF EMBANKMENT AND SUPPORT GROUND SYSTEMCONSIDERING DYNAMIC INTERACTION WITH THE SIDE GROUND

摘要

This paper presents a one dimensional dynamic response analysis method to evaluate the dynamicresponse of an embankment and a support ground system based on the stiffness matrix method toconsider the dynamic interaction between an embankment and a support ground. The motion ofequation for a embankment is formulated under the assumption that the shape of embankment is aarbitrary trapezoid and the embankment is divided into some horizontally layered thin elements. Thewhole stiffness matrix for an embankment and a support ground system is obtained by consideringnot only the dynamic interaction between an embankment and a support ground but also thatbetween the embankment-support ground system and the side layered ground. In order to verify anaccuracy of the proposed method, seismic response analysis for two-dimensional FE model ofembankment and support ground is carried out. Furthermore, this method is applied to estimate thedynamic response of the river dike where has been suffered by the northern Miyagi earthquake, July26, 2003 Japan. It is found that the dynamic interaction between embankment-support groundsystem and side layered ground is very important role for evaluating the dynamic response ofembankment and that the natural period at 1st mode for the river dike and support ground systemcalculated by the proposed method is good agreement with that obtained by the analysis of measuredmicro-tremor on the top of the river dike.