Abstract: Shield tunnel section on Zemin stationDaqingqiao station section on line 1 of Ningbo rail transit crosses XiaoshanNingbo railway bridge. Area between pile foundation of the railway bridge and tunnel bottom is pressed grouted to control the settlement of the railway and to guarantee the safety of the railway bridge and the railway. Shield was stopped due to the grouting drill rod dropped during the grouting. The risk of the shield tunnelling is analyzed, and the risk treatments are presented. The paper can provide reference for similar projects in the future.

Key words: rail transit, shield tunnel, grouting and reinforcement, obstacle