Abstract：
The shield tunnel of the newly-built Beijing Subway Line 14 crosses over the Subway Line 15, and their clear longitudinal distance is only 1.9m. During construction, various optimizing measures were adopted, such as ground monitoring, interval division, timely remedial pouring, opening blocking, improved tubular sheet and polyurethane insulating ring, etc. The monitoring results showed that the settlement curve of tunnel is stable when shield machine crosses over.
