Application of Under-pinning Pipe Jacking on Tunnel Auxiliary Construction

When a new structure is constructed in an overcrowded underground space, it necessary to consider how reduce the impact of on surrounding existing structures and ground, one methods under-pinning method using pipe jacking. The general term for reinforce lower part with piles pipes advance construction ground. In this study, various numerical analyses were carried out assuming that jacking was applied case where be installed underneath structure. As result comparison method, clarified suppressed influence ground by supporting overburden pressure above over wide area. addition, found combination pipe-roof which are placed top structure, more effective suppress deformation around than alone.