Abstract：Using commercial finite difference numerical simulation software FLAC3D，the ground settlement induced by underground excavation of subway diameter line between Beijing Station and Beijing West Station is studied. According to the geological exploration data，a typical section of pile-in-hole method is selected to build computing model. And the effect of existing subway load and specific construction management are considered in the calculating conditions. Moreover，computing schemes and steps are designed based on these. According to the calculating results，the ground settlement induced by the existing subway load and the underground excavation is analyzed，and the relations and variation rules among settlements of tunnel，existing subway and ground are studied at the same time. Simultaneously，feasibility of diameter line construction is validated，which provides data supporting and references to specific technology improvement for subsequent construction.
