SUBSIDENCE CAUSED BY METRO TUNNEL EXCAVATION WITH SHIELD METHOD IN SHANGHAI

摘要

In the excavation course of metro interval tunnel in soft soil, shield method is the preferential selection. For the soft soil will lose its bearing capacity and consolidate again under disturbance, which will induce the subsidence of land surface. So, the study on subsidence course caused by shield method and influencing factors is significant both in theory and practice. The influence of changing of original earth stress, strata lose, inadequate filling to construction gap and other influencing factors to land subsidence in the course of tunnel excavation by shield method is discussed in detail in the paper. The influencing area of the subsidence, the relationship between subsidence and injected amount, together with the measures to control the subsidence are presented in quantity, which will provide valuable reference for subsidence control in the excavation of underground tunnel by shield method.