A low improvement ratio cement deep mixing in combination with cement pipe mixing method for large scale reclamation at Patimban Port development project

There are unprecedented challenges to the design of the Patimban Port Development Project, a huge port complex housing 4000m berth length and 320ha terminal area planned to be built 1km offshore of Subang coast, the Republic of Indonesia. Seating on extremely difficult ground, conventional soft soil treatment techniques are found not effective, nor environmentally friendly. A novel design approach that combines the Low Improvement ratio Cement Deep Mixing (CDM) method for the stabilization of the soft foundation and the Cement Pipe Mixing (CPM) method for the solidification and reuse of dredged material on reclamation is therefore proposed to reduce the project cost, and to minimize the adverse impacts to the environment. This paper describes the design method and selection process of the CDM and CPM, the very first project worldwide that combined two different soil solidification techniques in practice.