Abstract：Post-construction consolidation settlement of soil above tunnel axis caused by shield tunneling is studied. Initial excess pore water pressure，due to stress release by unloading of soil excavation，is triangle-shaped distributed. Assuming that linings are undrained，soil is under single-drainage condition，and thickness of compressed soil equals that of soil above tunnel；theoretical calculation formula of post-construction consolidation settlement is obtained based on Terzaghi’s one-dimensional consolidation theory. Long-term settlements of ground are divided into settlement during construction and post-construction consolidation settlement. Furthermore，theoretical calculation formula of long-term ground settlement is deduced. As shown in analytical calculation，the calculated results are in good agreement with the field data. It is analyzed that long-term ground settlements caused by shield tunneling construction in soft soil of Shanghai are very noticeable. Final settlements of ground can reach above 80 mm，and 80%～90% of settlements are consolidation settlement. Assuming that the earth thickness above the tunnel lining is 5 m，consolidation settlement will be stable after at least 2 years.
