Study On Seismic Response Analysis And Shock Absorption Measures Of Shield Tunnel

With the accumulation of seismic disaster data and the development of scientific research, people have gradually realized the deficiency of pseudo-static mechanics method when analyzing the seismic response of underground structure. On the other hand, the dynamic finite element method is considered to be preferable. Supported by the research project of key technologies of Changjiang Tunnel Engineering in Wuhan, the main research work of this paper, focusing on the research and improvement of seismic response analysis methods of shield tunnel, and the effect of different parameters of structure and joints on the structure's seismic behavior, could be summarized as the following five aspects.1. The significance of the research work, the key points and existing methods of aseismic analysis of shield tunnel are briefly summarized, as well as the general situation of Changjiang Tunnel Engineering in Wuhan.2. Basing on comparing the transient heat conduction equation and the pore pressure dissipation equation, this paper presents a new multi-iteration serial partitioned solution procedure, which is adapt to redevelopment of existing finite element softwares and could give satisfying computational precise and stability. Subsequently, this approach is applied in transverse dynamic response analysis of Wuhan Changjiang Tunnel, with the estimation given in the end of the soil liquefaction hazard of the site.3. Combining the dynamic finite element method and the beam-spring model, this paper presented a new transverse seismic response analysis method of shield tunnel, which is, then, applied to calculate the transverse seismic response of Wuhan Changjiang Tunnel, with emphasis on the influence of different structural parameters on the structure's seismic behavior, and the shock absorption effect of strengthening the soil foundations.4. The response displacement method, with the different computational methods of the parameters systematically concluded, and a simplified dynamic finite element...