Case Study on Application of an Innovative Method of Pulling Out the Earth Retaining Pile with Less Ground Surface Settlement

Temporally constructed steel sheet piles to retain the excavated ground wall at neighboring construction sites have been often left in the ground even after the backfill at the open-cut was completed. This is because the pull-out of steel sheet piles causes the non-negligible subsidence of the surrounding ground. In order to suppress ground deformation caused by the extraction, "A method of pulling out the earth retaining pile and filling filler at the same time" was developed and has been applied in more than 530 cases where the surrounding ground deformation was especially concerned. In this paper, a method of pulling out the earth retaining pile and filling filler at the same time is introduced, and its application is described. From the same case, the validity of the prediction of settlement of the surrounding ground during pull-out of steel sheet pile by the simple method is examined. As an initial step to develop three-dimensional elasto-plastic finite element method for evaluating ground deformation during the application of the simultaneous pull-out filling method, the mechanical properties of the filler are investigated taking curing period into account through uniaxial compression tests.