【作者】 李铁生；

【导师】 袁勇；

【作者基本信息】 同济大学 ， 结构工程， 2007， 硕士

【摘要】 轨道交通的建设是缓解城市交通拥挤的重要手段之一。然而，在繁华的闹市区修建地铁车站对周边环境和路面交通限制都较大，这时采用盖挖法施工是一项有效的解决办法。目前，我国地铁车站设计中普遍采用的一次加载的计算模式，也没有考虑盖挖施工临时路面体系传递的竖向荷载。实际上，车站结构的设计控制指标往往会在施工过程达到，因此，有必要研究反映盖挖法车站结构受力状态全过程的设计方法。 为考虑车站结构在建造期和使用期等各阶段受力的继承性，本文研究采用增量法原理分析盖挖法车站结构受力变化过程，以确定合理的设计指标。分析模型考虑结构的水平和竖向承载效应，以弹塑性弹簧单元模拟结构-土之间的相互作用。其中，假定等效水平弹簧的弹性极限与土体的埋深相关，并且考虑了支护结构位移对其的影响。此外，本文还对地基土的竖向基床系数和切向基床系数的取值方法进行了探讨，并提出了后者的简化确定方法。 本文建议的全过程分析方法能够有效模拟结构在建造期和使用期等各阶段不同的受力状况，为盖挖法地铁车站设计提供了有效分析工具。更多还原

【Abstract】 Construction of the urban rail transit is one of the important measures to solve the conflict of the city traffic. However, it will influence the environment and obstruct the traffic to build the metro station in the busy streets. As a result, the cover-excavation method is adopted as an effective solution. Presently, the complete loading calculation mode is widely used as the design method of the metro station, but the vertical load from the temporary road surface system isn’t taken into account. In fact, the design requirement of the station structure is usually obtained in the construction process, so it is necessary to study the whole-process design method which can reflect the load status of the station structure built by the cover-construction method.In order to consider the loading succession in the construction period and the service period of the station structure, the incremental calculation method is adopted to analyze the loading process of the station structure and to obtain the reasonable design requirements. The elastic-plastic spring is used to simulate the interaction between the structure and the soil when we analyze the horizontal and vertical load-bearing effect of the structure. We assume that the elastic limit of the equivalent horizontal spring is related with the embedded depth, and the influence of the displacement of the retaining wall is taken into consideration. In addition, the calculation method of the vertical and tangential coefficient of subgrade reaction is discussed, and this paper puts forward the simplified calculation method of the tangential coefficient of subgrade reaction.The whole-process analysis method can be used to simulate the different loading state of the structure in construction period and service period, and can be regarded as an effective analysis tool in the design of the metro station built by the cover-excavation method.更多还原