SPECIAL GROUND IMPROVEMENT METHODS - GROUND IMPROVEMENTS ASSOCIATED WITH THE TRANS-TOKYO BAY HIGHWAY

The Trans-Tokyo Bay Highway comprises the Ukishima access, two artific ial islands, at Kisarazu and Kawasaki, a shield tunnel, and a bridge. The ground along the route is soft clay or loose seabed mud, so variou s ground improvement works had to be carried out before the constructi on of large-scale structures could be commenced. In this report is des cribed how the sand compaction pile method (SCP), the slurry mixture c ement treatment method, the dry mixture cement treatment method, and t he deep mixing method (DMM) were used for ground stability and improve ment.