Abstract
Long term measurements of ground movements were made at three different sections around an earth pressure balance shield tunnel construction in Yurakucho lower clay. The data were examined in view of tail void settlement and subsequent settlement. The results revealed that (1) it is rational to distinguish the tail void settlement and subsequent settlement by the change in vertical strain immediately above tunnel crown, (2) ground deformation during tail void settlement could be approximately expressed by an elastic solution for a cavity in an infinite media, and (3) soils around the tunnel move predominantly downwards during subsequent settlement.
