隧道结构抗震薄弱部位的动力响应研究
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摘要
近年来随着城市交通状况的日益恶化,地下工程在城市工程建设中的重要性日益突出,而我国大部分地区处于地震高发区,许多地下结构建在地震频繁发生地地区,如何保证地铁等地下工程在地震时功能正常,深具现实意义。本文主要从隧道及地下结构地震响应分析的基本原理出发,利用数值模拟研究方法,探讨地铁隧道和地下结构的地震反应特性,分析各种因素对隧道地震反应的影响,并着重研究了并行地铁隧道、交叠隧道、地铁车站接头、山岭隧道洞口段的抗震反应特征。本论文主要包括以下几个方面的研究:
     1.在大量阅读文献的基础上,对于隧道抗震的研究背景、研究内容、研究现状及发展趋势做了非常全面的概括和阐述;
     2.建立了圆形隧道的地震反应分析模型,通过圆形隧道的开挖效应模型,衬砌和之间等代单元的设置,求得竣工时期的位移场和应力场。再运用FLAC3D的动力时程分析方法,分析隧道衬砌的地震响应特性,并对影响隧道衬砌的受力与变形的一些因素(如激振方向、地震烈度、衬砌厚度)作了计算与归纳。
     3.对不同地质条件下的两孔平行隧道的抗震性能进行了分析,研究两孔平行隧道的动力反应的规律,并与单孔情况作了比较。最后通过改变两孔隧道的净距,研究并行隧道距离的变化对地震反应的影响。
     4.对不同地质条件下的交叠隧道的抗震性能进行了分析,研究交叠隧道的动力反应的规律,对交叠隧道的抗震安全进行评价,为实际工程提供理论指导。
     5.分别对地铁车站接头部位和山岭隧道洞口段的抗震性能进行了分析,研究车站接头部位和洞口段的动力响应的规律,对其结构的抗震安全进行评价,为实际工程提供理论指导。
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.
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