THE CONSTRUCTION LOAD DUE TO THE SHARP CURVED LINE IN HARD SOIL CONDITIONS

Abstract

The shield tunnel project in TSUKUBA EXPRESS line adopted the method using wide-width RC segments for part of efforts to reduce project cost. The results of pre-analysis and experiment confirmed that its safty was by no means inferior to normal-width RC segments if designed properly.
However, Kotobuki tunnel project had concerns about the adverse effects on wide-width RC segments by the construction load due to the sharp curved line in hard soil conditions.
This text reports the results of the construction in Kotobuki tunnel and points to be considered in the applic -ation of wide-width RC segments in the sharp curved line.