ABSTRACT
To explore the dynamic interaction between the soil and structure and improve the seismic design method for the underground structure, numerical simulation was applied to discuss the influence of the underground structure on the surrounding soils. The seismic influence range of the underground structure on surrounding soils was explored with different influence factors, including structural form, site class, input ground motion and burial depth. The results showed that the more complex the structural form, the worse the soil condition, the lower the earthquake frequency, and the deeper the buried depth, the more obvious the influence effect on its seismic influence range. Nevertheless, the seismic influence range of the underground structure on the surrounding soils was basically within four times the structural width under different conditions. Then, an improved seismic design method was proposed. The improved method drew on the seismic influence range discussed above. Validation models with different boundary ranges were established and the results from two improved seismic design methods and the dynamic time-history method were compared. The results showed that it was necessary to determine the value range of the model boundary. The calculation accuracy of the two seismic design methods after boundary correction was higher, which can be applied to seismic design for shallow buried underground structures.
