| 渤海海域软土层土对地震动参数的影响研究 |
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| 引用本文： | 周星源,彭艳菊,方怡,赵庆凯,柳扬斌,黄帅,吕悦军.渤海海域软土层土对地震动参数的影响研究[J].震灾防御技术,2021,16(1):91-104. |
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| 作者姓名： | 周星源 彭艳菊 方怡 赵庆凯 柳扬斌 黄帅 吕悦军 |
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| 作者单位： | 1.应急管理部国家自然灾害防治研究院，北京 100085 |
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| 基金项目： | 国家重点研发计划（2017YFC1500403） |
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| 摘 要： | 渤海海域软土层土对场地设计地震动参数取值具有显著影响。选取渤海中部钻孔剖面作为计算场地模型基础，分别构建软土和硬土场地模型，并通过改变软土层厚度，构造新的场地模型。采用等效线性化方法（EL法）和非线性计算方法（NL法）分别对场地模型进行地震反应分析，分析了海底软土层土对地震动参数的影响。研究结果表明:海底软土层土对地震动峰值加速度的影响显著，随着地震动输入增加，软土层放大效应减弱，减震作用逐渐增强；EL法中，软土层土对基岩反应谱的高频部分具有明显滤波作用，而NL法中，滤波作用较弱，海底面反应谱随地震动输入的增大先放大后减小；软土层土会降低设计地震动地震最大影响系数，增大特征周期。对于海域工程，特别是深基础工程抗震设计地震动参数的确定，从保守角度考虑，建立场地模型时建议删除软土层。
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| 关 键 词： | 渤海海域 非线性方法 软土层 地震动参数 |
| 收稿时间： | 2020/12/16 0:00:00 |
Investigation on the Effect of Surface Soft Soil on Seismic Ground Motion Parameter in Bohai Sea, China |
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| Zhou Xingyuan,Peng Yanju,Fang Yi,Zhao Qingkai,Liu Yangbin,Huang Shuai,Lv Yuejun.Investigation on the Effect of Surface Soft Soil on Seismic Ground Motion Parameter in Bohai Sea, China[J].Technology for Earthquake Disaster Prevention,2021,16(1):91-104. |
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| Authors: | Zhou Xingyuan Peng Yanju Fang Yi Zhao Qingkai Liu Yangbin Huang Shuai Lv Yuejun |
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| Institution: | 1.National Institute of Natural Hazards, MEMC, Beijing 100085, China2.Tianjin Branch of China National Offshore Oil Corporation, Tianjin 300452, China |
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| Abstract: | The surface soft soil in Bohai presents a significant impact on the ground motion design parameters. The boreholes in the central Bohai are selected as the basis for the seismic response simulation. The site models with surface soft soil and without surface soft soil are constructed respectively, and a series of new soil models are constructed by changing thickness of surface soft soil. The seismic site response analyses are performed by equivalent linear wave propagation analysis (EL) and nonlinear analysis (NL). The influences of the surface soft soil on the ground motion parameters are concluded as follows. The submarine surface soft soil has a significant impact on the peak acceleration of ground motion. The amplification effects of the soft soil layer fade with the increasement of the input ground motion, and the reduction effects strengthen gradually. In the EL method, the surface soft soil layer has obvious filtering effects on the high-frequency part of the bedrock response spectrum. In the NL method, the filtering effects are much weaker, and the seabed surface response spectrum appears as the input ground motion increases at first and decreases afterwards. The maximum of the seismic effect coefficient decrease, and the characteristic periods of response spectra increase because of the existence of surface soft soil. It is recommended to remove the soft surface layer before building the site model for the determination of the marine engineering ground motion parameters. |
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| Keywords: | Bohai sea Nonlinear analysis Surface soft soil Ground motion parameters |
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