Abstract:

It is the first time in China that the construction of the overlapped tunnels is executed after the pile foundations of a large building with large axial forces are underpinned and cut. It is not only necessary to ensure the safety and stability of the building during the underpinning construction, but also necessary to control the settlement of the underpinning piles and the structural columns during the construction of the underneath tunnels, so that the structural stability can be guaranteed. In this article, the settlement effect of the pile foundation underpinning area induced by the construction of the overlapped tunnels is analyzed so that the correlation between the settlement effect and the construction of the overlapped tunnels can be described and the underpinning construction and the overlapped tunnel construction can be introduced, so as to provide reference for the future.

Key words:  , overlapped tunnel pile foundation underpinning settlement