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Inelastic Analysis and Damage Assessment of Hydraulic Arched Tunnels in Different Near-Fault Regions
Benbo Sun,Mingjiang Deng,Sherong Zhang,Chao Wang,Wei Cui,Xiaohua Zhao,Lei Kou,Binghan Xue 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.9
The seismic natural hazard event is a threat of unpredictable events, which can easily cause incalculable damage to hydraulic tunnels. Traditionally, it is necessary to introduce as-recorded ground motions (GMs) appropriately for hydraulic arched tunnels during seismic design to avoid the unfavorable situation of large-scale collapse. However, the lack of adequate current selected methodology considering the accurate engineering site relative to the fault line in this type can result in more considerable deformations and severe damage to structures. Actually, the detailed explanation of the seismic design code of hydraulic tunnels cannot support the specific consideration of the spatial region effects since the considerable uncertainty of engineering sites in water resources and hydropower engineering. To address this issue, the present study proposes a novel selected methodology of as-recorded GMs that integrates the geographic location distribution of the strong earthquake monitoring station instead of the actual engineering site relative to the fault line. Subsequently, three-dimensional finite element models of a hydraulic arched tunnel reveal the possible seismic behavior of the tunnel induced by as-recorded GMs in different near-fault regions. Furthermore, the optimal IM between different near-fault regions and structural responses is also discussed through correlation analysis because it can describe the seismological features of as-recorded GMs, which has a crucial role in seismic design and performance assessment. The results reveal that the as-recorded GMs in the hanging wall region can induce more significant deformations and severe damage to the structure than other near-fault regions of as-recorded GMs. Meanwhile, the seismological characteristics and selected optimal IM for as-recorded GMs in different near-fault regions significantly differ. In summary, data and observations from these results highlight that considering the near-fault region effect is critical in optimizing the seismic design code.
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