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汶川地震远场黄土场地地震动场地放大效应机制研究

ISSN号：1000-7598
期刊名称：岩土力学
时间：0
页码：3736-3740
分类：TU435[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]甘肃省地震局中国地震局黄土地震工程重点实验室,兰州730000, [2]中国地震局兰州地震研究所,兰州730000, [3]甘肃省岩土防灾工程技术研究中心,兰州730000, [4]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,兰州730000
相关基金：国家自然科学基金项目（No.40902094,No.50978239）中国地震局地震预测研究所基本科研业务费项目（No.2012IESLZ01）;国家重点基础研究发展计划资助（973项目1（No.2012CB026106）.
相关项目：黄土地基抗液化处理技术研究

关键词：黄土场地, 放大效应, 动力响应, 波速, loess site, amplification effect, dynamic response, wave velocity

中文摘要：

通过汶川地震震后科学考察发现，汶川地震局部场地的震害和地震动放大效应明显，地震对甘肃省境内远离震中的黄土地区造成了较为严重的破坏。在此基础上，结合钻孔波速测试，运用之维等价线性时程响应动分析法对甘肃省平凉市典型黄土塬进行了地震动力响应计算，分析了该地区局部场地条件对地震动放大效应的影响。研究发现，黄土塬具有地震动放大效应，随着塬高的增加，加速度、速度、位移均出现放大效应；随着地震动在黄土覆盖层中的传递，卓越频率向低频移动，高频成分被吸收，加速度反应谱中长周期分量逐渐增大。数值计算结果与实际震害基本吻合，其结果对黄土地区进行合理的抗震设防具有一定的科学意义。

英文摘要：

Based on earthquake damage investigation after the Wenchuan Ms8.0 earthquake, it is discovered that the phenomena of site amplification effects on ground motion were very obvious both in the mountainous area of southeastern Gansu province and the Loess Plateau areas. Combining with the borehole exploration, site seismic response analysis of the typical loess tableland at Pingliang City, Gansu province is carried out applying the dynamic finite dement method of two dimensions linearly equivalent for dynamic response numerical calculation; the local amplification effect of the loess tableland is studied as well. The results show that there are seismic amplification effects at loess tableland; and acceleration, velocity and displacement increases with increase in tableland height gradually. Moreover, the low frequency components become more abundant and the high-frequency components are absorbed with increase in tableland height. The long-period components of acceleration response spectrum have increased gradually as well. The numerical results are basically consistent with the earthquake damages, so as to have certain scientific significance for the reasonable seismic fortification in loess regions.

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