成都地铁2号线东门大桥站结构内力分析

发布时间：2018-07-28 10:36

【摘要】：地铁车站常常建造于环境较为复杂的城市之中,周边有密集的建筑物和复杂的地下管线,对地面交通与地表沉降有较为严格的要求。因此,为了保证基坑安全,减小对周边建筑物的影响,需要研究基坑围护结构内力与变形情况。此外,为了保证车站的安全,减小对地面的影响,也需要研究车站结构的内力与变形情况。本论文主要针对东门大桥车站进行基坑围护结构计算,对实际施工时的难点进行分析,随后进行车站结构平面与三维计算分析,为此后车站的设计提供一些有益的结论和建议。首先通过调研对比分析了地铁车站常见施工方法:明挖法、盖挖法、暗挖法等工法特点及适用条件,介绍了常用的基坑支护结构特点与适用条件。论文以东门大桥站为研究对象,进行了车站围护结构的方案比选,确定了围护结构的具体型式。其次,分析了东门大桥站围护结构的内力与变形情况,保证了围护结构安全性。针对实际施工中需要在顶板结构上进行盾构机起吊的情况,为了减少顶板的施工浪费,提出了在设计时考虑结构柱位的布置和增加临时措施的方法,未增加板厚和配筋,即可保证顺利起吊。在实际施工时,监测盾构机起吊过程中结构板最大变形为5mm,在结构允许变形范围以内,证明结构是安全的。最后,对车站结构进行平面与三维计算分析,分析了楼板与梁柱的位移与内力,为车站结构的设计提供参考;对比了这二种方法的计算结果,结果说明二维计算出的楼板和梁柱内力偏大,即实际设计工作中按平面设计是安全可靠的。
[Abstract]:Subway stations are often built in cities with complex environments, with dense buildings and complex underground pipelines around them. Therefore, there are strict requirements for land transportation and surface subsidence. Therefore, in order to ensure the safety of foundation pit and reduce the influence on surrounding buildings, it is necessary to study the internal force and deformation of foundation pit enclosure. In addition, in order to ensure the safety of the station and reduce the influence on the ground, it is also necessary to study the internal force and deformation of the station structure. This paper mainly carries on the foundation pit envelope structure calculation for the Dongmen Bridge station, analyzes the difficulty in the actual construction, then carries on the station structure plane and the three-dimensional computation analysis, provides some beneficial conclusions and suggestions for the later station design. Firstly, the characteristics and applicable conditions of common construction methods of subway station, such as open excavation method, cover excavation method, hidden excavation method and so on, are compared and analyzed, and the characteristics and applicable conditions of common foundation pit supporting structure are introduced. Taking Dongmen Bridge Station as the research object, this paper compares and selects the schemes of the station enclosure structure, and determines the concrete type of the enclosure structure. Secondly, the internal force and deformation of the retaining structure of Dongmen Bridge station are analyzed to ensure the safety of the enclosure structure. In order to reduce the waste of roof construction, in order to reduce the waste of roof construction, the method of considering the arrangement of structural column position and adding temporary measures is put forward in order to reduce the waste of roof construction in view of the lifting of shield machine on roof structure in actual construction, without increasing the thickness and reinforcement of the plate. Can guarantee smooth lifting. In actual construction, the maximum deformation of the structure plate is 5 mm in the process of shield machine lifting, and it is proved that the structure is safe within the allowable deformation range of the structure. Finally, the plane and three dimensional calculation and analysis of station structure are carried out, and the displacement and internal force of floor slab and Liang Zhu are analyzed, which provides a reference for the design of station structure, and compares the calculation results of these two methods. The results show that the internal forces of floor and Liang Zhu calculated by two dimensional method are too large, that is to say, it is safe and reliable to design according to plane in actual design work.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U231.4;TU93

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