CONSTRUCTION OF A LARGE SECTION SHIELD TUNNEL IN DIAGONAL CROSSING RIGHT UNDER THE EXISTING SUBWAY

Abstract

This shield is of slurry type to be used for excavation of the double-track shield tunnel of 9.5m dia. and 858m length. Under the moat, it diagonally crosses over 155m right under the existing subway tunnel with an overburden of 3.75m.
Therefore, we have executed prediction of influences on the existing subway tunnel prior to excavation. Under construction, we measured the behaviors of the subway tunnel.