Effect of imperfect interface on the dynamic response of a circular lined tunnel impacted by plane P-waves: Fid-Bau Portal

Effect of imperfect interface on the dynamic response of a circular lined tunnel impacted by plane P-waves

Yi, C.P. / Lu, W.b. / Zhang, P. / Johansson, D. / Nyberg, U.

Highlights • We discuss the dynamic response of a lined tunnel with an imperfect interface subjected to plane P-waves. • We discuss the variation of DSCF in the rock and the lining with different frequencies of the incident wave. • We discuss the variation of DSCF in the rock and the lining with different interface parameters. • We obtain the phenomenon of resonance scattering with extremely imperfect interface.

Abstract A theoretical method for studying the dynamic response of a circular lined tunnel with an imperfectly bonded interface subjected to plane P-waves is presented in the paper. The wave function expansion method was used and the imperfect interface was modeled with a spring model. Two cases were discussed in the paper. In the first case rock is harder than the lining and vice-versa in the second case. The results indicated that the variation in the stiffness of the interface has much influence on the distribution of dynamic stress concentration factors (DSCF) in the rock and the lining. The imperfection of the interface has a more noticeable influence on the DSCF in the rock mass and the lining at high frequency incident wave’s scenario than low frequency incident wave’s scenario. The resonance scattering phenomena can be observed when the bond is extremely weak. Limiting cases were considered and a good agreement with the solutions available in the literature was obtained.