紧邻既有线地铁车站深基坑施工开挖方案研究  

Study on the Excavation Scheme for the Deep Foundation Pit of a Subway Station Approaching an Existing Railway

作　　者：宋林[1] 李昌宁[1] 范恒秀[1] 

机构地区：[1]中铁一局集团有限公司技术研发中心,西安710055

出　　处：《现代隧道技术》2016年第5期154-160,共7页Modern Tunnelling Technology

基　　金：2014年陕西省博士后科研项目资助

摘　　要：施工开挖方案的合理选择对控制紧邻既有线地铁车站基坑工程的变形至关重要。文章以深圳1 1号线前海湾站基坑工程为背景,采用有限元软件建立三维数值模型,考虑土体、围护结构和支撑体系的相互作用,对基坑明挖顺筑法和盖挖逆筑法两种施工方案进行动态研究。结果表明,与明挖顺筑法相比,盖挖逆筑法可有效控制围护结构的变形,但围护桩所产生的弯矩和剪力相对较大。研究结果可为深基坑施工方案提供必要的理论数据支撑。The appropriate selection of an excavation scheme is important for controlling the deformation of the deep foundation pit of a subway station approaching an existing railway. Using the foundation pit engineering of the Qianhaiwan station of Shenzhen Metro line ll as a background, and considering the interaction of the soil mass, re- taining structure and support system, a 3D numerical model is established by finite element software to carry on a dynamic study of the two excavation schemes, i.e., the open-cut bottom-up method and the cover-and-cut top- down method. The results show that the latter is more effective for controlling the deformation of the retaining struc- ture while the bending moment and shearing force produced by the retaining structure is larger. This research pro- vides essential theoretical data support for excavation schemes of deep foundation pit construction.

关 键 词：深基坑 明挖顺筑法 盖挖逆筑法 变形控制 三维数值模拟 

分 类 号：TU753.1[建筑科学—建筑技术科学]