2017 Volume 73 Issue 1 Pages 62-75
The Press-in Method is a piling technique where a static jacking force is used to install a prefabricated pile. It offers a wall of piles efficiently, as the press-in machine gains a reaction force form the previously installed piles. The structures constituted by the wall of piles are named as Implant Structures by the authors, exemplified by self-retaining walls, coastal levees and cell foundations, where appropriate embedment depths are assured to resist to the external loads on themselves. The performance of two types of these structures - the self-retaining wall with inclination and the novel type of self-retaining wall intended to reduce the deformation during its service period - have been investigated through model tests and field tests, which is reported in this paper. The latter self-retaining wall is the structure constructed by applying a horizontal load on its head after excavation, and was confirmed to be effective in reducing the deformation of the wall due to the backside surcharge. Finally, methods to estimate the deformation of the wall due to the excavation, the horizontal load and the backside surcharge are discussed.