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预测模型和相关的不确定性为动态切削模量和缓冲比率的北京泥粘土
Yi Fang1,2, Guanlan Xu1, Zhengyang Zhang1
1Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing, 211816, China.
Scientific reports
|November 21, 2025
概括
这项研究使用大卫科夫脊柱曲线模拟土壤动态特性,用于北京的泥土粘土. 它建立了切削模量和缓冲比的深度依赖模型,这对地质工程至关重要.
科学领域:
- 地质技术工程 地质技术工程
- 土壤动力学 土壤动力学
- 地震现场响应反应
背景情况:
- 准确地描述土壤动态特性 (规范化的剪切模量和缓冲比) 对于地震现场反应分析至关重要.
- 现有的模型往往缺乏深度特定的考虑因素,限制了它们在分层土壤配置文件中的适用性.
- 了解与这些参数相关的不确定性对于可靠的工程设计至关重要.
研究的目的:
- 开发深度依赖的预测模型,用于正常化的剪切模量和沉比率的泥土.
- 用第一阶秒时刻法来描述这些预测参数中的不确定性.
- 为区域土壤动态参数的确定和不确定性量化提供指导.
主要方法:
- 利用北京未受干扰的泥土 (深度高达120米) 中的正常化剪切模量和阻尼比率的实验数据.
- 应用了戴维登科夫脊柱曲线来建模正常化的剪切模量.
- 制定了减缓比作为小应变减缓比和正常化的剪切模量复合函数.
- 采用一级秒时刻方法来分析参数和预测不确定性.
主要成果:
- 确定了大卫科夫模型参数 (A,B,gr) 和小应变减压比的显著深度依赖.
- 建立了准确的依赖深度的预测模型,用于正常化的剪切模量和缓冲比.
- 量化了预测值的不确定性,并对两个参数的深度和剪切应变分析了其演变.
结论:
- 开发的深度依赖模型改善了预测泥土壤动态性质的预测.
- 不确定性分析为地质工程项目的风险评估提供了关键的见解.
- 这项研究为区域性土壤动态参数的确定和地震工程中的不确定性量化提供了有价值的指导.
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