System dynamic behavior of high-speed railway infrastructure on multilayered soils considering soil nonlinearities

考虑土壤非线性的多层土壤上高速铁路基础设施的系统动态行为

• 批准号: 392201168
• 负责人: Professor Dr.-Ing. Frank Rackwitz
• 金额: --
• 依托单位: National Natural Science Foundation of China
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/392201168?language=en
• 关键词: System; dynamic; behavior; speed; railway

The objective of the proposed project is to develop models for prognosis of train-track-soil behavior due to high speed trains (velocity over 400 km/h), to evaluate existing infrastructure in the context of infrastructure stability by a train speed increase and to propose vibration reduction remedies. An improved understanding of the physical phenomena associated with transmission of vibrations induced by high speed trains and variation of soil properties at resonance-like state and the ability to model in the most realistic way potentially problematic locations would allow us to propose cost effective mitigation measurements. Along these lines, an advanced theoretical and numerical model for the train-track-soil interaction will be developed in an attempt to study the dynamic behavior of railway infrastructure and the surrounding soil. A detailed train-track-soil mechanical model and the accompanied numerical tool will be constructed taking into account the nonlinear behavior of the track and the soils under dynamic load induced by high-speed train passage. Multilayered geological profiles will be taken into consideration with soft soil material and discontinuities. The following mechanical aspects of the problem will be thoroughly investigated: i) inelastic and poroelastic behavior of the soft soil stratum under high-speed train passage, (ii) wave energy localized distribution and propagation from high-speed railway in the infrastructure and inhomogeneous soil foundation, iii) critical velocity of the train which leads to resonance condition and response amplification of the track and the soil foundation, and (iv) variation of soil properties at resonance state induced by high speed train loading. The developed numerical tool will be validated and where necessary updated based on in-situ measurements conducted by the applicants in a test site of the cooperation partner in China, where high speed railway constructed on various subsoils is in operation. Various in-situ tests will be performed, measured data will be collected and soil samples from the test site will be tested to obtain their strength and deformation characteristics. By means of in-situ and laboratory investigations, an efficient numerical tool for prognosis and evaluation of high-speed train infrastructure will be developed for practical applications.

拟议项目的目标是开发预测高速列车（速度超过 400 公里/小时）引起的列车-轨道-土壤行为的模型，通过列车速度增加来评估现有基础设施的稳定性，并提出减振措施。更好地理解与高速列车引起的振动传播和类共振状态下土壤特性变化相关的物理现象，以及以最现实的方式对潜在问题位置进行建模的能力，将使我们能够提出具有成本效益的缓解措施。沿着这些思路，将开发火车-轨道-土壤相互作用的先进理论和数值模型，以尝试研究铁路基础设施和周围土壤的动态行为。将构建详细的火车-轨道-土壤力学模型和随附的数值工具，考虑高速列车通过引起的动载荷下轨道和土壤的非线性行为。将考虑软土材料和不连续性的多层地质剖面。将深入研究该问题的以下力学方面：i）高速列车通过下软土层的非弹性和多孔弹性行为，（ii）基础设施和不均匀土壤中高速铁路的波能局部分布和传播地基，iii）列车的临界速度，导致轨道和土壤基础的共振条件和响应放大，以及（iv）高速列车加载引起的共振状态下土壤特性的变化。 所开发的数值工具将根据申请人在中国合作伙伴的试验场进行的现场测量进行验证，并在必要时进行更新，在中国，不同地基上建造的高速铁路正在运营。将进行各种现场试验，收集测量数据，并对试验现场的土样进行测试，以获得其强度和变形特性。通过现场和实验室研究，将开发出一种有效的数值工具，用于高速列车基础设施的预测和评估，以供实际应用。