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BI-DIRECTIONAL EFFECTS ON THE TUNNEL-SOIL-PILE INTERACTION UNDER SEISMIC LOADINGS
Abstracts
The bi-directional mechanism influences tunnel forces and soil pressure when seismic excitation occurs. In this study, a tunnel-soil-pile interaction model was proposed, and an analytical formula was derived. These expressions consist of a bi-directional mechanism. In addition, the seismic excitation is considered as undamped free vibration, and the seismic wave shape is considered sinusoidal. Also, the soil behaves like an elastic, homogeneous, isotropic, and infinite medium to avoid the complexity of the formulation development. On the other hand, refractive and scattering waves and mode conversion of P or SV waves are not addressed in this study. Therefore, there is room to improve in the future. In parametric studies, the tunnel forces and soil pressure initially increased and then decreased after crossing a certain angle of incidence of seismic waves, according to bi-directionality. However, these synchronized behaviors were not seen for a single directional effect. In addition, the validation result of the bi-directional bending moment of the tunnel is nearly close. Therefore, it is essential to consider the bi-directionality in the interactive analysis.