Centrifuge and Numerical Modeling of the Seismic Response of Buried Water Supply Reservoirs
Centrifuge and Numerical Modeling of the Seismic Response of Buried Water Supply Reservoirs
复制标题
埋地供水水库地震响应的离心机和数值模拟
DOI：
10.1061/jggefk.gteng-11758
复制
发表时间：
2024
影响因子：
3.9
通讯作者：
Heins, James
中科院分区：
文献类型：
--
作者：
AlKhatib, Karim;Hashash, Youssef M.;Ziotopoulou, Katerina;Heins, James
在城市地区，越来越多地建造地下水库，以取代露天的地上市政供水水库，以提高水质，并利用其地表足迹作其他用途，如公园或放置太阳能电池板。这些生命线结构中有许多位于地震活跃地区，因此，需要设计成在强烈地震后仍能运行。然而，评估它们的地震反应是具有挑战性的，需要考虑结构与储存的流体和保留的土壤的相互作用；换句话说，计算流体-结构-土壤相互作用（FSSI）。本文采用实验与数值相结合的方法，研究了考虑FSSI的地下储层地震特性。在不同储层取向下进行了两组离心模型试验，研究了满、半满和空储层条件下的一维（1D）和二维（2D）运动效应。建立了相应的数值模型，其中结构和土壤采用连续拉格朗日有限元表示，流体采用任意拉格朗日欧拉公式表示。利用实验数据对土-结构和流-结构界面参数进行了标定。模拟成功地捕获了测量到的储层响应，包括加速度、弯矩增量和水压。研究发现，通常的平面应变假设不适用于储层，因为它们的行为是真正的三维（3D），应力在角落积聚。此外，满储层导致水库壁和顶部的地震需求最高，而空储层产生最大的基底滑移。研究表明，采用三维FSSI数值模拟可以较好地捕捉复杂储层的地震响应。
Buried water reservoirs are increasingly being built to replace open aboveground municipal water supply reservoirs in urban areas to enhance water quality and utilize their surface footprint for other purposes such as public parks or placement of solar arrays. Many of these lifeline structures are in seismically active regions and, as such, need to be designed to remain operational after severe earthquake shaking. However, evaluating their seismic response is challenging and involves accounting for the interaction of the structure with the stored fluid and the retained soil; in other words, accounting for fluid–structure–soil interaction (FSSI). This paper presents a combined experimental–numerical study on the seismic behavior of buried water reservoirs while considering FSSI. Two series of centrifuge model tests were performed at different reservoir orientations to investigate one-dimensional (1D) and two-dimensional (2D) motion effects under full, half-full, and empty reservoir conditions. Corresponding numerical models were developed whereby the structure and the soil were represented by continuum Lagrangian finite elements, while the fluid was modeled via Arbitrary Lagrangian Eulerian formulation. Soil–structure and fluid–structure interface parameters were calibrated using the experimental measurements. The simulations successfully captured the measured reservoir responses in terms of accelerations, bending moment increments, and water pressures. The study found that the common assumption of plane strain is not applicable for reservoirs because their behavior was found to be truly three-dimensional (3D) whereby stresses accumulated at the corners. Furthermore, the full reservoir resulted in the highest seismic demands in the reservoir walls and roof while the empty reservoir yielded the highest base slippage. The study demonstrates that the complex reservoir seismic response is best captured by carrying out a 3D FSSI numerical simulation.