在近断层脉冲型地面运动下,土坝中的动态坝-库相互作用(DRI)对地震需求的放大作用

IF 6.9 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
Ashesh Choudhury, Sudib Kumar Mishra, Priyanka Ghosh
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引用次数: 0

摘要

以往的研究主要是探讨土坝在远场地震作用下的地震易损性。在断层附近,由于共振效应,脉冲型运动放大了长周期结构的地震需求。因此,本文研究了考虑坝库动力相互作用(DRI)的近断层脉冲运动下土坝的地震需求放大。大坝和水库采用耦合欧拉-拉格朗日(CEL)方法进行建模,并将DRI分析与简化的边界应力(BS)分析进行比较。退化的剪切模量捕获了大坝土工材料中的非线性,而在水库中,它被压力-密度Hugoniot曲线捕获。不同危险等级的脉冲和非脉冲运动被用作输入,并使用有限元(FE)方法进行分析。脉冲运动引起相关响应的显著放大,如加速度、剪切应力、位移和剪切应变。后两者的放大更为突出,伴随着相当大的残余(位移和应变)。上游壳层、岩心和下游壳层的位移/加速度随坝高的变化曲线。在坝体上演示了响应特定的放大。使用模糊聚类算法(FCA)对放大进行正式分区,有助于总结。然而,储层的晃动行为对脉冲仍然不敏感。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Seismic demand amplification in earth dam by dynamic dam-reservoir interactions (DRI) under near fault pulse type ground motions
Past studies investigated the seismic vulnerability of earth dams subjected to far-field earthquakes. Near fault, pulse type motions are known to amplify the seismic demands in long-period structures due to the resonating effect. Thus, this study investigates the seismic demand amplification in an earth dam under near fault pulse type motions, accounting for the dynamic dam-reservoir interactions (DRI). The dam and reservoir are modeled using a Coupled Eulerian-Lagrangian (CEL) approach, with DRI analysis compared to a simplified boundary stress (BS) analysis. A degrading shear modulus captures non-linearity in the geo-materials of the dam, and in the reservoir, it is captured by a pressure-density Hugoniot curve. Pulse and non-pulse motions pertaining to various hazard levels are used as input, and the analysis is performed using the Finite Element (FE) method. The pulse motions induce significant amplifications of the pertinent responses, such as acceleration, shear stress, displacement, and shear strain. Amplifications are more prominent for the latter two, along with considerable residuals (displacement and strain). The profiles of displacement/acceleration along the dam height are shown for the upstream shell, core, and downstream shell. The response-specific amplifications are demonstrated over the dam body. A formal zonation of the amplifications is carried out using a fuzzy clustering algorithm (FCA), which helps summarizing. However, the sloshing behavior of the reservoir remains insensitive to the pulse(s).
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来源期刊
Engineering Geology
Engineering Geology 地学-地球科学综合
CiteScore
13.70
自引率
12.20%
发文量
327
审稿时长
5.6 months
期刊介绍: Engineering Geology, an international interdisciplinary journal, serves as a bridge between earth sciences and engineering, focusing on geological and geotechnical engineering. It welcomes studies with relevance to engineering, environmental concerns, and safety, catering to engineering geologists with backgrounds in geology or civil/mining engineering. Topics include applied geomorphology, structural geology, geophysics, geochemistry, environmental geology, hydrogeology, land use planning, natural hazards, remote sensing, soil and rock mechanics, and applied geotechnical engineering. The journal provides a platform for research at the intersection of geology and engineering disciplines.
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