Seismic performance of a large underground cavern at different excitation direction

Yimo Zhu, Qianbing Zhang

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther


Underground infrastructures can be adversely affected by earthquake-induced rock engineering vibration causing damage problems. These impacts are even more significantly affected for large underground caverns due to the large span and complex structures. Currently, time-history numerical simulation is still the most popular method for seismic design of underground infrastructure, however it is based on the plane-strain model and assumes the vertical incidence of seismic waves. In fact, the propagation direction of seismic wave is arbitrary and the effect of excitation direction has not been understood well. In this paper, a 3D full-scale hydropower station is built by FLAC3D, and several sets of seismic waves based on the real earthquake motions are applied from different excitation direction. The results show that the wave excitation direction directly influences the result of the large underground cavern assessment, which is manifested by traditional vertical wave applied at bottom underestimating the response, especially for the cases of high lateral stress.

Original languageEnglish
Title of host publication57th US Rock Mechanics/Geomechanics Symposium
PublisherAmerican Rock Mechanics Association (ARMA)
Number of pages7
ISBN (Electronic)9780979497582
Publication statusPublished - 2023
EventUS Rock Mechanics / Geomechanics Symposium 2023 - Atlanta, United States of America
Duration: 25 Jun 202328 Jun 2023
Conference number: 57th


ConferenceUS Rock Mechanics / Geomechanics Symposium 2023
Country/TerritoryUnited States of America

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