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Abstract: In recent years, cases have been reported in which road beds in in-service tunnels have heaved, necessitating suspension of expressway traffic. In Toyasan tunnel, which is a two-lane roadway 2600 m long from Aizubange to Nishi-Aizu along the Banetsu expressway, heaving of the road bed was found along a 126-m section two years after it was opened for traffic.Though the section where the road bed...