Deep Excavation in Very Soft Soil Using Cross Wall as Lateral Support

Abstract

Deep excavation in areas with very soft clay deposits need a good soil retaining system. Using diapraghm wall as soil retaining system for deep excavation is a good choice. Diapraghm wall is expected to limit the movement that occurs in the walls and avoid leaks that may occur in retaining system, this is needed to minimize damage to adjacent buildings. The top down excavation method by utilizing the basement floor as lateral resistance can be carried out to reduce the movement that occurs on the ground. In very soft soil areas with excavation distances to neighbors very close, the movement on the ground must be limited to minimize damage to adjacent buildings. Cross walls can be used to reduce the movement that occurs on the ground. Analysis finite element using the 2D Plaxis program was carried out to investigate the performance of the retaining wall. From the results of the analysis conducted shows that using a cross wall at a location below the raft pile can reduce the movement that occurs in the retaining wall and the excavation stage can be reduced. The results of this study can be used as a reference in the development of solution lateral support of soil retaining system in deep exaction especially needed in very soft soil condition.