在里克尔波段下,一个大城市规模的地点的2D非线性地震响应特征
Wei Ren1, Yan-Zhen Wang2, Jiao Zhu3
1Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing, 210009, China.
Scientific reports
|May 21, 2025
概括
这项研究使用二维有限元分析模拟了苏州的地震现场效应. 它揭示了土壤特性和地震频率如何影响地面运动放大,这对于城市地震危险评估至关重要.
科学领域:
- 地质物理学 地质物理学
- 计算地震学计算地震学
- 工程地震学 工程地震学
背景情况:
- 复杂,深度和不均的地质场所对地震危险评估构成重大挑战.
- 了解地震波通过各种土壤层传播的理解对于预测地面运动至关重要.
研究的目的:
- 研究苏州城市地区深层复杂沉积层表面的二维非线性地震效应.
- 分析输入基岩运动特征对表面峰值地面加速 (PGA) 的影响.
主要方法:
- 开发精细的2D有限元素模型,包括地质钻井数据和不均的网格.
- 使用非马辛构成模型模拟土壤的非线性和歇斯底里压力-应变行为.
- 在ABAQUS/显式框架内分析具有不同峰值频率和振幅的里克尔波段作为输入基岩运动.
主要成果:
- 表面PGA放大最初增加,然后随着峰值频率 (fp) 的增加而降低,在该站点的基本频率附近达到峰值.
- 在0.1赫兹的峰值频率下,表面PGA放大仅取决于基岩震动强度,因子从1.20到1.40.
- 集体实证模式分解有效地可视化了从岩基传播到表面的地震波的时间频率和时间能量变化.
结论:
- 该研究提供了对复杂的城市地质环境中非线性地震效应的空间分布的见解.
- 这些发现突显了基点基本频率和输入运动特征在地震波放大中的关键作用.
- 该方法提供了一种强大的方法来评估深层,不均的土壤层中的地震反应.
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