The Study Of Tunnel Seismic Dynamic Response Of The Weak Parts

With the city in recent years, worsening traffic conditions, construction of underground works in the city's importance in the increasingly prominent in most parts of our country high incidence in the earthquake, many underground structures built in earthquake-prone areas the place, how to ensure that underground subway works when the normal function of the earthquake of tremendous practical significance. This article from the earthquake response of tunnels and underground structures of the basic principles, and by using numerical simulation methods to explore the subway tunnels and underground structures of the seismic response analysis of various factors on the seismic response of the tunnel, and highlights the parallel subway tunnels, overlap tunnels, subway station connector, mountain tunnel entrance seismic response characteristics. This dissertation includes the following aspects of the study:1. In a lot of reading literature, based on the research background for the tunnel seismic research content, research status and development trend of a very comprehensive summary and elaboration;2. The establishment of a circular tunnel in seismic analysis, through the circular tunnel excavation effect model, between the lining and soil, etc. on behalf of the unit set, obtained during the completion of the displacement and stress field. Then use FLAC-3D's dynamic analysis method to analyze the seismic response of tunnel lining, and the impact of tunnel lining of the force and deformation of a number of factors (such as the excitation direction, seismic intensity, lining thickness) was calculated and summarized.3. Under different geological conditions on the two holes were parallel to the tunnel seismic analysis of the two holes parallel to the law of the dynamic response of the tunnel, and single hole were compared. Changes in the last two holes tunnel through the clear distance, the change of parallel tunnel from the impact of the earthquake response.4. Under different geological conditions were overlapping tunnel seismic analysis of the dynamic response of overlapping laws of the tunnel, on the overlap to evaluate the seismic safety of the tunnel, to provide theoretical guidance for the actual project.5.Subway station joints, respectively, and mountain tunnel entrance seismic performance analysis of the station entrance with joints and dynamic response of the law, its structure of seismic safety evaluation, to provide theoretical guidance for the actual project.