STUDY ON SETTLEMENT INDUCED BY EXCAVATION OF METRO STATION PILOT TUNNEL WITH PBA METHOD

The excavation of subway will take strongly influence on its surrounding soil, and the safety of surrounding buildings will be threatened while the settlement gets too large. Therefore, the study of the influence of excavation on surrounding environment is of great significance for subway construction. Besides the strata structure, the excavation sequence and excavation footage are two important factors that will change the surrounding environment. In this paper, based on the special soil rock composite geological situation of Changchun area, a numerical simulation for subway construction was performed by using FLAC3D finite differente software, including different excavation sequence and footage during the construction of metro station using PBA method. Through comparison of different schemes, the optimal scheme is determined for this project. These results are also useful for providing a basis for similar projects construction in the future.