| 基于动力有限差分法的典型海域自由场二维地震反应分析 |
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| 引用本文： | 宋星,兰景岩.基于动力有限差分法的典型海域自由场二维地震反应分析[J].地震学报,2020,42(6):769-780. |
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| 作者姓名： | 宋星 兰景岩 |
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| 作者单位： | 1.中国广西桂林 541004 桂林理工大学土木与建筑工程学院 |
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| 基金项目： | 国家自然科学基金（51408559）、广西自然科学基金（2018GXNSFAA281183）和广西岩土力学与工程重点实验室开放基金（桂科能19-Y-21-4）共同资助 |
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| 摘 要： | 以我国近海海域工程场地为研究对象，充分考虑上覆海水的自重影响，构建典型的饱和海底自由场计算模型，运用动力有限差分法开展二维地震反应分析，探讨以不同幅值的SV波、P波作为基底输入条件下上覆海水厚度对海底地震动峰值和反应谱的影响，总结上覆有水和无水场地的地震动结果差异，并分析差异产生的原因。结果表明:当基底输入SV波时，上覆有水场地海床表面峰值加速度小于上覆无水场地地表峰值加速度，海水层厚度对峰值加速度的影响可以忽略；当基底输入P波时，上覆有水场地海床表面峰值加速度大于上覆无水场地地表峰值加速度，且随着海水层厚度的增大，海床表面峰值加速度逐渐减小。
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| 关 键 词： | 海域饱和场地 上覆海水 地震反应分析 地震动参数 |
| 收稿时间： | 2019-12-31 |
Two dimensional seismic responses of free field in typical seafloor site based on dynamic finite difference method |
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| Affiliation: | 1.College of Civil Engineering and Architecture，Guilin University of Technology，Guangxi Guilin 541004，China2.Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering，Guilin University of Technology，Guangxi Guilin 541004，China |
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| Abstract: | Taking the engineering site in the offshore area of China as the research object, the typical calculation model of saturated submarine free field is constructed after fully considered the influence of self-weight stress of overlying sea water, and the dynamic finite difference method is implemented to carry out two-dimensional seismic response analysis. In this paper, we discussed the influence of the thickness of overlying sea water on the peak ground motion value and response spectrum of seafloor under the condition that SV and P waves of different amplitudes are used as the input of the basement, and systematically analyzed the causes of the differences. The results show that when SV wave is input into the sea floor, the peak acceleration of the sea floor surface is smaller than that of the overlying anhydrous site surface, and the effect of the thickness of the sea water layer on the peak acceleration can be ignored; when P wave is input into the sea floor, the peak acceleration of the sea floor surface is larger than that of the overlying anhydrous site surface, and the peak acceleration of the sea floor surface gradually decreases with the thickness of the sea water layer increase. |
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