渤海海域软土层土对地震动参数的影响研究

周星源; 彭艳菊; 方怡; 赵庆凯; 柳扬斌; 黄帅; 吕悦军

doi:10.11899/zzfy20210110

渤海海域软土层土对地震动参数的影响研究

doi: 10.11899/zzfy20210110

1.
应急管理部国家自然灾害防治研究院，北京 100085
2.
中海石油（中国）有限公司天津分公司，天津 300452

基金项目: 国家重点研发计划（2017YFC1500403）

详细信息

作者简介:
周星源，男，生于1996年。硕士研究生。主要从事海域场地地震效应方面的研究工作。E-mail：zhouxingyuan19@mails.ucas.ac.cn

通讯作者:
彭艳菊，女，生于1976年。正研级高级工程师。主要从事地震场地效应研究。E-mail：yanjupeng@ninhm.ac.cn

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出版历程
- 收稿日期: 2020-12-16
- 网络出版日期: 2021-07-12
- 刊出日期: 2021-03-01

Investigation on the Effect of Surface Soft Soil on Seismic Ground Motion Parameter in Bohai Sea, China

1.
National Institute of Natural Hazards, MEMC, Beijing 100085, China
2.
Tianjin Branch of China National Offshore Oil Corporation, Tianjin 300452, China

摘要

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。
- 渤海海域 /
- 非线性方法 /
- 软土层 /
- 地震动参数
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.
- Bohai sea /
- Nonlinear analysis /
- Surface soft soil /
- Ground motion parameters

HTML全文

图 1 场地土层分布

Figure 1. Models of Typical Sites

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图 2 渤海常见土类动力学参数

Figure 2. Dynamic Parameters of Common Soils in Bohai Sea

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图 3 目标谱、拟合谱对比图和基岩水平加速度时程曲线

Figure 3. Time histories and response spectrum of the input ground motions on bedrock

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图 4 不同计算方法对软土场地和硬土场地峰值加速度的影响

Figure 4. Peak ground acceleration of soft soil sites and hard soil sites from different simulation methods

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图 5 EL、NL法得到的场地1峰值加速度变化规律

Figure 5. Peak ground acceleration of site NO 1 obtained by equivalent linear wave propagation analysis and nonlinear analysis

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图 6 反应谱比值随基岩输入地震动的变化

Figure 6. Site response spectrum with different input ground motions on bedrock

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图 7 软土层厚度对地表峰值加速度的影响

Figure 7. Effects of soft surface thickness on peak ground acceleration

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图 8 场地1反应谱比值分布

Figure 8. Response spectrum ratio of new models of site No.1

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图 9 地震影响系数最大值与特征周期随软土层厚度的变化

Figure 9. Site coefficient and characteristic period with different soft soil thickness

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