PUBLICATON OF TECHNOLOGICAL CRITERIA ON SEISMIC RETROFIT OF RAILROAD MOUNTAIN TUNNELS IN JR EAST

Abstract

 This paper outlines seismic damage to tunnels and seismic retrofit to prevent heavy seismic damage to mountain tunnels. Some tunnels had suffered heavy seismic damage from earthquakes in 2004 and 2011. Through review of investigations of tunnels and ground properties around tunnels, authors confirmed the cause of the seismic damage. And authors also showed early resoration technique. With accumulation of knowledge of damage analysis, restoration techniques, proper and timely decisions by JR East’s expert engineers, and technology developed to seismically retrofit tunnels, we published technological criteria on seismic retrofit of raillorad mountain tunnels in JR East.