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Abstract: The time domain electromagnetic method, TDEM, was conducted to estimate the geological condition and structure on a gneiss tunnel construction site in the Aichi Prefecture, Japan. Three dimensional distribution of resistivity were obtained by plural three measuring lines with TDEM and geological distribution and geotechnical problems were inferred. This paper described the estimation results of...
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 2007. Through detailed investigation of tunnels and ground properties around tunnels, authors confirmed the cause of the seismic damage. And, based on the damage analysis, authors categorized the...