MECHANISM AND APPLICABILITY OF THE ISOLATION METHOD FOR CUT AND COVER TUNNEL

Abstract

An effective reinforcement method for the side wall of a cut and cover tunnel has not been established yet. We develop a new seismic countermeasure of the under ground structure based on new concept. In this method a polymer material whose stiffness is quite flexible, is embedded both sides of the tunnel.
We examined the factor that the section force decreases by using the proposed isolation method. The factor is a covered soil, and a ratio of the stiffness between the ground and the structure. It was found that these factors were related to the effect of the isolation method. We proposed a simple chart. We can judge the effect that the section force decreases by using the chart.