COMPARATIVE STUDY OF RETROFIT TECHNIQUE 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 method constructed outside of the tunnel. The method is a polymer isolation method, the soil improvement method, and the RC diaphragm wall. It was found that the polymer isolation method was effective and practicable for seismic countermeasure.