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海湾深厚海床场地二维非线性远场强地震反应特征 被引量:3

2D Nonlinear Site Response Characteristics of a Cross‑bay Deep Seabed Subjected to Far‑field Strong Earthquakes
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摘要 人们早已认识到远距离强地震可能引起覆盖层深厚的沿海或盆地城市发生严重的地震灾害。以某杭州湾跨海通道为背景,建立跨海湾海床二维场地的精细化有限元模型,依据区域地震活动性,选取远场大地震井下记录作为海床基岩的输入地震动,考虑地震动特性、海床微地形特征、沉积土的空间异质性和非线性滞回特性,研究了远场强震引起的海床场地非线性地震效应特征。海床场地效应与海床微地形特征、沉积土的空间异质性和输入地震动特性密切相关。凹陷地表边缘、基岩隆起和凹陷部位及海床土软弱区域的场地放大效应显著,呈现出低频聚焦现象,且竖向地震反应更为明显。仅考虑水平向地震作用将显著低估海床非线性场地效应程度,水平向和竖向地震同时作用引起的竖向地震效应不应忽视。 It has long been recognized that urban areas located in coastal regions or basins with deep and soft soil deposits subjected to long-distance strong earthquakes are prone to serious seismic disasters.Taking a sea-crossing project in Hangzhou Bay as the research issue,a 2D refined finite element simulated model of a large-scale seabed site was established.According to the regional seismicity,the far-field strong earthquake records were selected as input seabed bedrock motions.Considering the ground motion characteristics,the micro-topography of the seabed,the spatial heterogeneity and the nonlinear hysteresis characteristics of soils,and the seismic response characteristics of seabed sites were studied.The site effects are closely related to seabed topographical features,spatial heterogeneity of soils,and input seabed bedrock motion characteristics.The significant site amplification effect may focus on the edges of seabed surface depression areas,the convex and concave areas of the underlying bedrock interface,and the seabed soft soil areas,exhibiting a low-frequency focusing effect on soil amplification.Compared with horizontal shaking,the site amplifications on vertical shaking in these areas are more significant.The nonlinear seabed site effect will be significantly underestimated when only the horizontal seabed bedrock motion is adopted.The simultaneous input of the horizontal and vertical seabed bedrock motions results in a substantial vertical site response,compared to the input of only the horizontal seabed bedrock motion.
作者 缪涵 王彦臻 方怡 陈国兴 MIAO Han;WANG Yanzhen;FANG Yi;CHEN Guoxing(Institute of Geotechnical Engineering,Nanjing Tech University,Nanjing 210009,China;National Institute of Natural Hazards,Beijing 100085,China;Civil Engineering and Earthquake Disaster Prevention Center of Jiangsu Province,Nanjing 210009,China)
出处 《防灾减灾工程学报》 CSCD 北大核心 2023年第4期637-649,共13页 Journal of Disaster Prevention and Mitigation Engineering
基金 国家自然科学基金项目(51978334)资助。
关键词 深厚海床场地 远场强地震 二维非线性场地效应 土的非线性 海床地形地貌 deep seabed site far-field strong earthquake 2D nonlinear site effect soil nonlinearity seabed topography
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