Special ground improvement methods: Ground improvements associated with the Trans‐Tokyo Bay Highway

Abstract

The Trans‐Tokyo Bay Highway comprises the Ukishima access, two artificial islands, at Kisarazu and Kawasaki, a shield tunnel, and a bridge. The ground along the route is soft clay or loose seabed mud, so various ground improvement works had to be carried out before the construction of large‐scale structures could be commenced. In this report is described how the sand compaction pile method (SCP), the slurry mixture cement treatment method, the dry mixture cement treatment method, and the deep mixing method (DMM) were used for ground stability and improvement.