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Seismic response of high plasticity clays during extreme events

机译：高塑性粘土在极端事件中的地震响应

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Mexico City high plasticity clays exhibit a small degree of nonlinearity for shear strains as large as 0.1%, which leads to both moderate shear stiffness degradation and small to medium damping increment, even for long duration subduction strong ground motions, such as the 8.1M(w) 1985Michoacan earthquake. Nonetheless, current seismic design criteria of strategic infrastructure used worldwide have striven for having larger return periods for establishing the seismic environment, considering recent large magnitude (M > 8.5M(w)) events. This paper presents the study of the seismic response of typical high plasticity clays found in the so-called Texcoco Lake, in the surrounding of Mexico City valley, for larger to extreme earthquakes. The shear wave velocity profile was characterized using a down-hole test. The seismic environment was established from a set of uniform hazard response spectra developed for a nearby rock outcrop for return periods of 125, 250, 475 and 2475 years. A time-domain spectral matching was used to develop acceleration time histories compatible with each uniform hazard response spectrum. Both frequency and time domain site response analyses were carried out considering each seismic scenario. Ground nonlinearities were clearly observed in the soil response during extreme ground shaken, which increases rapidly with the return period. This fact must be taken into account to avoid costly and potentially unsafe seismic designs. (C) 2015 Elsevier Ltd. All rights reserved.
机译：墨西哥城的高塑性粘土对高达0.1％的剪切应变表现出较小的非线性，这导致中等剪切刚度退化和小至中等阻尼增量，即使长时间俯冲强烈的地面运动（例如8.1M） w）1985年的米却肯地震。尽管如此，考虑到最近发生的大地震（M> 8.5M（w））事件，当前全球范围内使用的战略基础设施的抗震设计标准都在努力为建立地震环境提供更大的回收期。本文介绍了在墨西哥城山谷周围所谓的Texcoco湖中发现的典型高塑性粘土对大地震到极端地震的地震响应的研究。使用井下测试表征剪切波速度分布。地震环境是根据为附近岩石露头开发的一套统一的灾害响应谱建立的，其返回期分别为125、250、475和2475年。使用时域频谱匹配来开发与每个统一危害响应频谱兼容的加速时间历史。考虑到每种地震情况，都进行了频域和时域现场响应分析。在极端地面震动期间，在土壤响应中清楚地观察到地面非线性，随着返回期的增加，地面非线性迅速增加。必须考虑到这一事实，以避免昂贵且潜在不安全的地震设计。 （C）2015 Elsevier Ltd.保留所有权利。

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