Seismic analysis and dynamic behavior characterization of rib-reinforced pre-cast tunnels

The novel cut-and-cover tunnel construction method using rib-reinforced pre-cast arch segments has been recently developed and applied for practice to secure a structural stability of high covering and wide width section tunnels. Cut-and-cover tunnels are usually damaged by the seismic behavior of backfill grounds in case of a low covering condition. Seismic analyses are performed in this study to characterize the dynamic behavior of rib-reinforced pre-cast arch cut-and-cover tunnels. Seismic analyses for 2 lane cast-in-place and rib-reinforced pre-cast arch cut-and-cover tunnels are carried out by using the commercial FDM program (FLAC2D) considering various field conditions such as the covering height, embankment slope, and excavation slope. It can be concluded that the amplification of seismic wave is reduced due to an increase in the structural stiffness induced by rib-reinforcement. The results show that the rib-reinforced pre-cast arch cut-and-cover tunnels are more effective against the seismic loading, compared to the cast-in-place cut-and-cover tunnels.

keywords: 리브 보강, 프리캐스트 아치 개착 터널, 내진해석, 주파수 영역 해석, Rib-reinforcement, pre-cast arch cut-and-cover tunnel, seismic analysis, frequency domain analysis, Rib-reinforcement, pre-cast arch cut-and-cover tunnel, seismic analysis, frequency domain analysis

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Article Contents

Vol.11 No.3

Seismic analysis and dynamic behavior characterization of rib-reinforced pre-cast tunnels

Abstract

Reference

(사)한국터널지하공간학회