Study On The Application Of Structural Technology For Underpinning Engineering Of High-loaded Pile Foundation

The foundation of existing building may need to be underpinned when new tunnel of metro or other underground structures are being built. Among various kinds of underpinning engineering, the underpinning of high-- loaded pile foundation under complex geological condition, which invoKes many problems of structure, subsoil and underground water, is the most difficult. Special research is necessary and in urgent need. In this paper, basing on the Shenzhen Metro project, pile foundation underpinning of Department Store Mansion, methods of theoretical analysis, FEM and model test have been applied to sfudy on the key problems of structure technology in underpinning engineering of high條oaded pile foundation. Five kinds of beam梡illar joint, one of which is recommended in the end, are analyzed and tested. Detailed and extensive research on the construction program of driving梪nderpinning is done and proper construction scheme is put forward. Some problems of the new piles and the underpinning beam are also discussed. Finally a system of information feedback construction is given.