Isolation Piles Protection Research of the Tianning Tower in the Construction of Shield Tunnel of Ningbo Metro Line 1

摘要

The interval tunnel between the Ximen station and the Drum Tower station of Ningbo metro line 1 goes through the national reserve cultural relics of Tianning tower. This interval tunnel is constructed by shield method. To ensure the safety of the Tianning tower, the impact of shield construction on the tower should be evaluated. Two kinds of FEM software are used in the safety assessment to analyze the additional deformation of the Tianning tower caused by shield construction. In order to reduce the differential settlement and incline of the tower, the isolation piles protection is considered to use as protection method. For the different calculation schemes of pile location, pile length and pile diameter, the protective effect is analyzed and the measures are proposed.