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首页> 外文会议>Offshore Technology Conference;ExxonMobil;FMCTechnologies;Schlumberger >Comparison of the Seismic Response of Offshore Slopes Using 1, 2, or 3 Ground Motion Components
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Comparison of the Seismic Response of Offshore Slopes Using 1, 2, or 3 Ground Motion Components

机译：用1、2或3个地震动分量比较海上斜坡的地震响应

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摘要

Offshore landslides pose a major threat to subsea facilities, and one of the main triggering factors ofrnoffshore landslides is strong earthquakes. The state of the practice models offshore slope stability duringrnstrong shaking using one horizontal component of a selected representative ground motion. However,rnslopes and earthquakes are three-dimensional phenomena. Therefore, to provide much needed guidancernin this area, this study performed 27 three-dimensional seismic slope stability analyses in a finite elementrnprogram to investigate the change in the predicted results when applying one, two, or three ground motionrncomponents.rnThe results showed that applying two horizontal components instead of one may increase the predictedrntotal displacements and shear strains on the slope by 25% to 50% and by 10% to 50%, respectively. Inrnaddition, it may also increase the total displacements at the seafloor on the shelf above the slope by 20%rnto 40%. This could have implications when deciding the safe stand-back line for offshore facilities.rnHowever, applying three ground motion components has a negligible effect on the results compared withrnapplying only the two horizontal components. The ratio of the response spectra on the shelf, slope, andrnbasin varied by u0002 25%, however no clear trend was observed.
机译：海上滑坡对海底设施构成了重大威胁，造成海上滑坡的主要诱因之一是强烈地震。实践状态使用选定的代表性地面运动的一个水平分量来模拟强震动期间的海上边坡稳定性。但是，斜坡和地震是三维现象。因此，为提供该地区急需的指导，本研究在有限元程序中进行了27次三维地震边坡稳定性分析，以研究应用一个，两个或三个地震动分量时预测结果的变化。结果表明，应用两个水平分量而不是水平分量可能会使斜坡上的预测总位移和剪切应变分别增加25％至50％和10％至5​​0％。此外，它还可能使斜坡上方架子海底的总位移增加20％至40％。这在确定海上设施的安全备用线时可能会产生影响。但是，与仅应用两个水平分量相比，应用三个地震​​动分量对结果的影响可以忽略不计。架子，斜坡和rnbasin上的响应光谱的比率变化了25％，但是没有观察到明显的趋势。

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