Abstract: The Peck Formula is often used to predict the surface settlement dur to the tunnel excavation. The influence of various factors that might cause the surface settlement during the tunnel excavation and these factors might lead to a large settlement prediction error. In this paper, based on the construction monitoring data during the overlapping construction of the four lines of tunnels between Xujiahui Station and Shanghai Gymnasium Station of Shanghai Metro Line No.11, the width correction coefficient of the settlement trough and the maximum settlement correction coefficient of the surface are introduced, and the Peck Formula was improved and corrected to meet the requirements of the construction conditions. The monitored data indicated that, when the maximum settlement correction coefficient of the surface was between 0.2 and 1.2 and the correction coefficient of slot width is between 0.4 and 1.6, a good settlement prediction curve can be obtained.

Key words: Multi-line Overlapped Tunnel, Ground Settlement, Improved Peck Formula, Corrected Parameters