To study the influence of the underground tubular structure on the seismic subsidence of shallow raft foundations in the soft soil site

a method for analyzing the seismic subsidence of the shallow raft foundation in soft soil was established based on the FLAC3D finite difference analysis platform and vibration softening model. By comparing the simulated and measured values of seismic subsidence and damage of typical building foundations in soft soil of Tanggu Port in Tianjin during 1976 Tangshan earthquake

the rationality of the proposed method was verified. Numerical simulation was carried out for analyzing the influence of different burial conditions and cross-sectional dimensions of square-sectional (for example) underground tubular structures on seismic subsidence of shallow raft foundation. Results show that the underground tubular structure has a more significant impact on the seismic subsidence of the superstructure with a lighter self-weight

affecting the design and construction of workshop structure. The seismic subsidence decreases with the increase of the relative size of the underground tubular structure

and tends to be steady after it exceeds the width of the foundation. Seismic subsidence increases with the increase of the burial depth of the underground tubular structure

and eventually tends to be the result without underground tubular structures. The seismic subsidence initially increases with the increase of the burial distance between the underground tubular structure and building

and decreases afterwards. In terms of seismic subsidence control

the distance from the underground tubular structure to the existing building needs to be controlled.