Abstract: With the largescale development of the urban construction, more and more engineering projects are in the safety restriction areas along subway lines. This paper presents a case history of the safety evaluation of the impact of the pile installation in the safety restriction zone of the adjacent tunnel on the stability of the existing tunnel in Baoan District of Shenzhen City. The Boussinesq theory was applied to obtain an analytical solution of the effective stress on the existing tunnel. The pile installation induced deformation of the adjacent tunnel was simulated with MIDAS GTS threedimensional approach. The soil squeeze effect induced by the pile installation on the deformation of the tunnel was also evaluated by the “equivalent volume” method.

Key words:  Subway Tunnels, ThreeDimensional Analysis, Pile Installations, Deformation Control