【作者】 沈慧；

【导师】 迟世春；

【作者基本信息】 大连理工大学 ， 水工结构工程， 2006， 硕士

【摘要】 盾构法隧道是现代都市生命线工程的重要组成部分，确保其抗震安全性有重要的社会和经济意义。本文采用三维非线性静动力有限元法，在考虑盾构隧道开挖影响的基础上，对单孔及两孔平行隧道的抗震问题进行了深入细致的研究。 论文首先对地下结构抗震的研究方法、内容、现状及发展趋势进行了较为全面的概括和阐述。然后介绍了盾构隧道抗震分析的理论基础和三维非线性有限元分析的数学力学模型。在模型处理上，结合盾构法隧道的施工过程，模拟其掘进开挖。在土体和管片之间设置等代层单元模拟隧道与周围土体之间的接触状态，以解决土体和管片之间的相对运动和应力转移问题。鉴于初始应力对结构抗震的影响，根据应力释放法原理，运用FORTRAN语言编制了计算程序，通过算例验证了计算程序的可靠性。 盾构隧道及土体系统的动力有限元分析采用粘性阻尼边界，推导了边界辐射的阻尼矩阵，采用wilson-θ法求解动力有限元方程。对某单孔盾构隧道进行了地震反应的非线性分析，主要包括静力分析、动力时程分析，衬砌内力分析等；对影响衬砌受力的因素如地下水位、衬砌模量、土层参数、地震峰值加速度等分别作了计算与归纳。对两孔平行盾构隧道静动力反应规律也进行了分析，讨论了并行隧道净间距变化对盾构管片地震反应的影响，总结了其内力变化规律，得出的结论可为实际工程设计和施工提供科学依据。更多还原

【Abstract】 Shield tunnel is an important component of the modern metropolitan lifeline engineering. Therefore the research on its seismic security is very important. In this thesis, the seismic response of single and double-hole parallel shield tunnel is analyzed by the three dimensional nonlinear static and dynamic FEM.In the thesis, the development of seismic response analysis method of underground structure has been reviewed at first. Then, the theoretical basis of seismic analysis of shield tunnel is introduced. In the FEM mesh, an equivalent circle zone, which has the weakly mechanical properties, is set between the concrete segment of the tunnel and the surrounding soil to simulate the mechanical behavior of interface, and the stress-releasing method was used to simulate the excavating process of the soil in the tunnel. A FORTRAN program is developed, and its reliability was proved through some examples.Furthermore, the damping matrix of boundary radiation is deduced using the viscous artificial boundary condition. The dynamic finite element equation is solved by Wilson-θ method. Based on the theory and method mentioned above, taking a single shield tunnel as example, the thesis puts emphasis on the study of static analysis, dynamic time-history analysis, and lining inner force, etc. A series of influencing factors, such as groundwater level, lining’s module, soil layer’s parameters, and seismic peak acceleration are discussed separately. Consequently, some beneficial conclusions are obtained. Following work achieved above, the regularity of static and dynamic response of double-hole parallel tunnel with different distance was discussed. According this thesis researches, some beneficial rules and valuable conclusions have been obtained for shield tunnel construction.更多还原