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Numerical Analysis of the Transverse Dynamic Response of Mountain Tunnels Subjected to an Oblique Incidence of Earthquake Waves
(1 Key Laboratory of Road & Bridges and Underground Engineering of Gansu Province, Lanzhou Jiaotong University,
Lanzhou 730070; 2 National and Provincial Joint Engineering Laboratory of Road & Bridge Disaster Prevention and Control, Lanzhou Jiaotong University, Lanzhou 730070; 3 Key Laboratory of Transportation Tunnel Engineering, Ministry of Education, School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031; 4 Shanghai Urban Construction Design & Research Institute, Shanghai 200125)
Abstract The significant characteristic of a near-fault earthquake is its directivity effect, therefore, the influence of non-uniform excitation induced by an oblique incident earthquake on a tunnel structure should not be ignored.Based on the wave numerical simulation theory of a viscoelastic artificial boundary, a numerical analysis of the transverse seismic response of a mountain tunnel was carried out with the Wenchuan Wolong earthquake wave using ANSYS, and the influence of the incident angle on the lining dynamic response was studied. The results show that: the dynamic responses of the lining structures subjected to the oblique incidence of seismic waves are quite different from those subjected to the vertical incidence of seismic waves, and they present the characteristics of being vertical?
ly loaded, with a structure response that increases with an increase of the incident angle; and in the case of oblique incidence, weak parts of the lining are at the crown, haunch and arch spring.
Abstract：
The significant characteristic of a near-fault earthquake is its directivity effect, therefore, the influence of non-uniform excitation induced by an oblique incident earthquake on a tunnel structure should not be ignored.Based on the wave numerical simulation theory of a viscoelastic artificial boundary, a numerical analysis of the transverse seismic response of a mountain tunnel was carried out with the Wenchuan Wolong earthquake wave using ANSYS, and the influence of the incident angle on the lining dynamic response was studied. The results show that: the dynamic responses of the lining structures subjected to the oblique incidence of seismic waves are quite different from those subjected to the vertical incidence of seismic waves, and they present the characteristics of being vertical?
ly loaded, with a structure response that increases with an increase of the incident angle; and in the case of oblique incidence, weak parts of the lining are at the crown, haunch and arch spring.
.Numerical Analysis of the Transverse Dynamic Response of Mountain Tunnels Subjected to an Oblique Incidence of Earthquake Waves[J] MODERN TUNNELLING TECHNOLOGY, 2017,V54(3): 90-96
2017, Vol. 54 