Objective For the construction of large ancillary structures such as wind pavilions for subway stations, deep foundation pit excavation simultaneously with demolition of large wall sections connecting to the existing station is required, necessitating an in-depth research about the impact of such construction on the existing stations.
Method Based on the construction project of a station on Suzhou Metro Line 8, the deformation patterns of the main station structure under stress during wind pavilion construction are analyzed with finite element simulation and onsite monitoring methods. Key construction-impacted areas are identified, and the relationship between the wall demolition area and the deformation of structural components under stress in the impacted area is determined.
Result & Conclusion During wind pavilion construction, the deep foundation pit excavation and large wall demolition result in sharp changes in the stress on the station structure such as deformation, with the impact concentrated around the vicinity of the opening. The deep foundation pit excavation for the wind pavilion plays a dominant role in the overall deformation pattern of the station structure. The influence of wall demolition construction on the lateral displacement of the side walls below the wind pavilion, and the vertical displacement of adjacent floor slabs shows an approximately exponential and linear positive correlation with the cumulative demolition area, respectively, while the impact of wall demolition in the wind pavilion far-end is minor. Wall demolition construction increases the axial compressive force in the edge columns at the wind pavilion opening, with an uneven load distribution among the columns, exhibiting a symmetric distribution pattern with larger loads in the middle and smaller loads at both ends. The increase in axial force of the edge columns due to wall demolition shows an approximately linear positive correlation with the cumulative demolition area.
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