文章摘要
柯明.明-暗挖结合地铁风亭结构受力及抗震分析[J].交通运输研究,2019,5(1):73-80.
明-暗挖结合地铁风亭结构受力及抗震分析
Stress and Seismic Analysis of Metro Ventilation Pavilion Structure Combined with Open-Cut and Underground Excavation
  
DOI:
中文关键词: 地铁风亭  明-暗挖结合  变形控制  抗震设计  数值模拟
英文关键词: metro ventilation pavilion  open-cut and underground excavation  deformation control  seismic design  numerical simulation
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作者单位
柯明 中铁第一勘察设计院集团有限公司 
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中文摘要:
      为研究明-暗挖结合地铁风亭结构的建筑布置、受力及抗震性能,并针对可能出现的问题给出应对措施,以某地铁区间风亭为例,基于Midas-GTS有限元软件对基坑、隧道开挖过程进行数值模拟分析。每一工况下结构的变形及内力计算结果显示,各受力构件刚度匹配,构件整体承载能力强,具有一定的安全储备。基于此,提出了风井采用明挖法,正线隧道采用暗挖法,活塞风道采用倒挂井壁法的明-暗挖结合的设计方案。经三维抗震验算,论证了该结构设计方案合理可行。研究表明,该方案能够有效保护周边环境,且结构整体性能良好,符合地铁结构设计要求;由于该风亭处于断层破碎带,同时明-暗挖节点为抗震设防的重点部位,在节点位置可采用型钢、附加钢筋等加强措施;对于明-暗挖结合的复杂结构,应严格按照先施工明挖结构,再施工暗挖洞室,最后施工明暗挖连接部分的工序,以降低后期施工对已完成结构的影响。
英文摘要:
      In order to study the architectural layout, structural stress and seismic performance of metro ventilation pavilion structure combined with open-cut and underground excavation, and propose countermeasures aiming at possible problems, taking a ventilation pavilion of a metro section as an example, a numerical simulation analysis of excavation of foundation pit and tunnel was carried out through Midas-GTS finite element software. The deformation and internal force of the structure under each load case were calculated. The result showed that the stiffness of the load-bearing components matches each other, and the total carrying capacity of the components were strong with a certain safety margin. A design scheme that combining open-cut excavation with underground excavation was proposed, which was executing open-cut excavation for ventilation pavilion, executing undermining excavation for main line tunnel, and executing inverted side-wall method for the air passage of piston. Through three-dimensional seismic checking, the structural design scheme was proved to be reasonable and feasible. The research findings show that the method, which effectively protect the surrounding environment and improve the performance of the structure, is consistent with the design demand of metro structure. Since the ventilation pavilion is located in the fracture zone of the fault zone, the joints between open-cut excavation and underground excavation are critical for seismic fortification which can be strengthened by shaped steel and additional bars. For the complex structure of open-cut excavation and underground excavation, the construction procedure of open-cut excavation structure, underground excavation chamber and connection between open-cut excavation and underground excavation should be strictly followed, so as to reduce the influence of later construction on the completed structure.
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