Analysis of Settlement Induced by Shield Construction of the Metro Passing under Existing Buildings Based on the Finite Difference Method

A frequent problem when constructing metro tunnels is the uneven settlement of adjacent buildings, which results in huge economic losses. Due to shields causing this study took Nantong Metro Line 1 as research object. The runs from East Huancheng Road Station Intermediate People’s Court and passes under old residential area Community Sendadi-Huayuan building. Based on monitoring data, analyzed impact tunnel shield construction foundation buildings. computational analysis was performed by numerical simulation, taking into account upper building load disturbance surrounding rock. Afterward, summarized law behind settlement. show that boring machine tunneling through sandy soil silt rich water, its head prone twisting due dissipation pore instability excavation process eventual ground In strata, relationship between caused time can be approximated an exponential function a certain area. vibrations foundations vibrate for short period time. Therefore, average buildings directly above underpass reached 7 mm/d. Likewise, 1.5 mm before passing It peak 4.0 5.1 during after respectively. width troughs approximately 7D formed excavated. Shield placed at top face state tensile stress, shear damage forming local plastic zone.