Abstract: In the deep excavations with very large area, if the depth of excavation is not excessive, the common excavation support method is the raking support utilizing the bottom structure as supporting points. An improved supporting method by using the additional platform without compromise the construction schedule is proposed to resist the axial force of the raking supports. The improved supporting method was verified by the analytical design method for the axial force, commercial excavation design software, and the monitoring results. It is concluded that the stress and strain in the pile are similar with three different method.

Key words: soft soils, raking support, deep excavation, additional platform, improved design