【摘要】 地铁车站施工工法中,洞桩法是目前较为常用的方法,其有适应面广、灵活性高、对周围环境影响小等优点,但也存在施工过程受力转换较为复杂、施工工期较长等缺点。其中,车站附属结构与主体结构接口施工是工程安全风险和工期控制的重要环节,为保证接口处安全施工,对接口处附属结构的暗挖开挖步序和风险预加固措施进行优化设计。采用有限元软件建立三维有限元模型,对优化前后两种施工方案进行数值模拟计算,结合现场监控量测数据,综合对比分析接口处附属初支结构拱顶和地表沉降值。结果表明:优化后的施工方案可以满足地表沉降和施工安全等各项施工技术要求,能够有效降低安全风险,研究成果可为类似工程提供借鉴和参考。更多还原

【Abstract】 The Pile-Beam-Arch(PBA) method is currently the most commonly method in the construction methods of metro stations,which has the advantages of wide adaptability,high flexibility,and minimal impact on the surrounding environment.However,it also has disadvantages such as complex stress conversion during the construction process and long construction period.The construction of the interface between the station accessory structure and the main structure is an important link for engineering safety and schedule control.To ensure construction safety,the excavation sequence and risk pre-reinforcement measures for the accessory structure at the interface were optimized and designed in this paper.A three-dimensional finite element model was established using finite element software,and numerical simulation calculations were performed on the two construction schemes before and after optimization.Combined with on-site monitoring and measurement data,a comprehensive comparative analysis was conducted on the arch crown and surface settlement values of the initial support structure at the interface.The results showed that the optimized construction plan can meet various construction technical requirements such as surface settlement and construction safety and effectively reduce safety risks.The research results can provide reference for similar projects.更多还原