Analysis of Impact of Bilateral Deep Foundation Pit Excavation on Adjacent Existing Station

Bilateral deep foundation pit excavation has significant influence on the structure and operations of the adjacent existing station. According to the excavation of Changsha railway station on Changsha new metro line 3 adjacent to the existing metro line 2, ABAQUS is applied to simulate dynamically the construction process of the bilateral deep foundation pit. Based on the field monitoring data, the correctness and validity of the model are verified. On this basis, the deformation characteristics of existing stations of bilateral deep foundation pit excavation are analyzed. From three aspects of excavation sequence, excavation depth and excavation width, the station deformation law is studied. The results show that (1) Symmetrical excavation is beneficial to control the horizontal displacement of the station, and asymmetric excavation is beneficial to control the vertical displacement; (2) With the increase of excavation width, the horizontal displacement and vertical displacement of the station increase.