底部有溶洞分布的盾构隧道结构安全性分析  

The Safety Analysis on the Shield Tunnel Structure above Karst Cave

作　　者：何恒之 方辉[2] 

机构地区：[1]广州地铁集团有限公司,广州510000 [2]广州大学建筑设计研究院,广州510006

出　　处：《广州建筑》2017年第3期13-17,共5页GUANGZHOU ARCHITECTURE

摘　　要：广州地铁九号线沿线灰岩区溶洞广泛分布,在地铁运营过程中隧道外侧进行基坑开挖和桩基础等工程活动时,对地铁隧道结构的安全影响较大,易发生突涌、塌陷等工程事故,甚至引发地质灾害。本文针对此类型地层,采用有限元计算软件分析底部溶洞存在时对既有地铁隧道结构产生的可能影响,进一步探讨了基坑施工以及桩基础施工对既有地铁隧道的影响,并总结了相关规律,可为岩溶区轨道交通的建设和保护提供依据。Limestone Karst caves are widely distributed along the Guangzhou metro line No.9, which are danger- ous to the safety of subway tunnel structure, such as engineering accidents （bursting or collapse of the excavation） and geological disasters, especially during the construction of foundation and piles near the existing tunnel. In this paper, the finite element method is employed to analyze the possible influence of the underground cave on the exist- ing subway tunnel structure. The influence of the construction of the foundation pit and pile foundation on the exist- ing subway tunnel is discussed, where corresponding general rules are summarized to provide the reference for the construction and protection of rail transportation in Karst area.

关 键 词：基坑 桩基础 溶洞 隧道 安全 

分 类 号：U455.43[建筑科学—桥梁与隧道工程] U458[交通运输工程—道路与铁道工程]