一次扣拱暗挖逆作法车站结构设计要点分析

作者：荣冰¹, 郭宁²

作者简介：

荣冰，正高级工程师，国家注册土木工程师（岩土），E-mail: rongbing@bjucd.com

作者单位：

1.北京城建设计发展集团股份有限公司，北京 100037；2.浙江大学岩土工程计算中心，浙江杭州 310058

基金项目：

*国家自然科学基金（52078456）

摘要：

随着城市地铁的快速发展，地铁线路通常会穿越人口密集、地面交通繁忙、地面建筑物林立、地下管线密布的市中心繁华地段，全暗挖法施工地铁车站在避免管线迁改、减少交通影响、改善施工环境等方面具有显著优势，但也具有施工条件受限、结构受力转换复杂、变形控制不利等特点。基于北京地铁14号线大望路站工程，分析了由于条件受限而采用全暗挖法施工的必要条件，针对一次扣拱暗挖法施工采用理论分析、数值计算、现场监测等手段对其结构受力体系、施工过程中地层变形控制等关键技术进行了系统分析和总结，揭示了该类型车站施工的受力和变形规律。

关键词：地铁车站；一次扣拱法；暗挖法；结构设计；受力体系；地层变形；施工技术

English：

With the rapid development of urban subway, subway lines usually pass through densely populated and busy areas with numerous surface transportation and buildings, as well as complex underground pipelines in the bustling downtown area. The construction of subway stations by undermining method has obvious advantages in avoiding pipeline relocation, reducing i traffic impact and improving construction environment and so on. However, it also has characteristics such as limited construction conditions, complex structural force conversion, and unfavorable deformation control. Based on Dawanglu Station project of Beijing Subway Line 14, the necessary conditions for using the full-face excavation method due to limited conditions are analyzed.The force system and key technologies of the construction process and stratum deformation control are systematically analyzed and summarized using theoretical analysis, numerical calculation, and on-site monitoring for the top-down bored excavation method with cast-in-situ arch. The stress and deformation laws of this type of station construction are revealed.

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