近断层速度脉冲地震动对边坡滑移的影响分析

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Abstract Based on the procedure to identify velocity pulse for multi-component ground motions，196 ground motions from NGA(next generation attenuation) database and Wenchuan earthquake are classified as pulse-like ground motions. Newmark decoupled method considering the nonlinear soil property is used to compare the sliding displacements of slopes caused by near-fault pulse-like and non-pulse-like ground motions. Effects of pulse characteristics and slope parameters on sliding displacement are analyzed；and the efficiency of different pulse-like ground motion parameters for predicting the displacement is also investigated. The analyses indicate that the near-fault pulse-like ground motions result in much larger displacement than non-pulse-like ground motions，especially significant effect on long-period slopes. Also，displacements induced by pulse-like ground motion commonly have shorter duration and larger sliding velocity compared with non-pulse-like ground motion. It is shown that sliding displacement characteristics caused by pulse-like ground motion are closely related to its velocity-pulse feature，and peak ground velocity is the most efficient parameter for predicting sliding displacement. The effectiveness of the equivalent wavelet pulse on representing the original pulse-like ground motions in terms of sliding displacement value is investigated. Finally，sliding displacements of slope to pulse-like ground motions is summarized in terms of a response surface.

Key words： slope engineering near-fault ground motions velocity pulse sliding displacement slope wavelet analysis

Received: 31 March 2013

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https://rockmech.whrsm.ac.cn/EN/Y2014/V33/I2/317

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