饱和软土地基中预制装配式地铁车站震害机理研究

预制装配式地铁车站是一种新兴的地下结构，具有高效、节能、环保的特点，是地下建筑技术发展必然趋势。本项目拟对饱和软土地基中预制装配式地铁车站的抗震问题开展系统研究，针对预制装配式地铁车站中榫槽式接头抗震性能薄弱的问题，通过低周反复加载试验，揭示榫槽式接头在灾变时的损伤机理、破坏过程；通过振动台模型试验，研究饱和软土地基中预制装配式地铁车站的动力响应规律、破坏过程及破坏模式；采用理论分析与数值仿真相结合的方法，建立地震动非一致激励下的饱和软土地基-预制装配式地铁车站整体系统三维数值模型及高效计算方法，研究预制装配式地铁车站的动力响应及榫槽式接头连接方式、地震波入射特征对其动力响应的影响规律，并以振动台模型试验结果验证，最终揭示饱和软土地基中预制装配式地铁车站震害机理。本项目的开展将为预制装配式地铁车站的抗震设计提供理论依据，对促进生命线工程抗震研究有重要的理论意义。

Prefabricated metro station is a new type of underground structure, which has the characteristics of high efficiency, energy saving and environmental protection，and it is the inevitable trend of the development of underground construction technology. A systematic research on seismic response and damage mechanism of prefabricated metro station in saturated soft soil layers will be carried out in the project. Firstly, for the problem of weak seismic performance of tongue and groove joints in prefabricated metro stations, the damage mechanism and destruction process of the tongue and groove joints during earthquake are discovered by the low-cycle repeated loading experiment. Secondly, the dynamic response law, failure process and failure mode of prefabricated metro station in saturated soft soil layers are studied by shaking table model test. Thirdly, a three-dimensional numerical model and an efficient calculation method of the overall system of soft soil layers and prefabricated metro station under non-uniform excitation are presented by combining theoretical analysis with numerical simulation, and the factors of seismic incident characteristics, the tongue and groove joints mode and soft soil physical parameters are discussed in order to explore the influence on the prefabricated metro station seismic response, which is validated by the results of shaking table model test. The damage mechanism of prefabricated metro station in soft soil layers is discovered finally. The project will provide a theoretical basis for prefabricated metro station seismic design in saturated soft soil layers, and have an important theoretical significance to promote the development of seismic resistance research of lifeline engineering.