Abstract
Excavation for the foundation of 1A anchorage of AKASHI-KAIKYO BRIDGE was finished in August 1991. This excavation had large depth and scale: 64m depth and 80.6m inner-diameter, which we had not experienced before. And, there was also some concern about bottom ground failure due to the ground water, because the ground water level was very high and the bottom ground was soft rock whose permeability was not so low.
Accordingly, we observed behavior of the retaining wall as well as condition of the bottom ground and estimated them by simulation analyses in order to predict and confirm stability of them during the excavation. We thus finished it in safety. This paper describes results of observation of the retaining wall and the bottom ground and simulation analyses in this excavation work.
