浅埋大跨度隧道临时支撑的拆除分析  

ANALYSIS OF DISMANTLING TEMPORARY SUPPORT OF SHALLOW-DEPTH LARGE-SPAN TUNNEL

作　　者：雷震宇[1] 周顺华[1] 

机构地区：[1]同济大学道路与交通工程教育部重点实验室,上海200092

出　　处：《工程力学》2006年第9期120-124,共5页Engineering Mechanics

摘　　要：对于复合式衬砌隧道,初支受力最危险的时期是为修筑二衬而分段拆除初期支护的临时支撑的过程。根据力平衡转换原理建立拆撑计算模式,并利用增量法对大跨度隧道临时支撑拆除过程中初支结构内力的变化规律进行了研究。以南京地铁鼓-玄区间渡线段眼镜法施工的隧道为例,分析了拆撑顺序对不同断面尺寸的大跨度隧道内力变化的影响,确定合理的拆撑方案;通过三维拆撑计算,确定了纵向一次性拆撑长度。For combined lining tunnel, initial liner is the most dangerous when temporary supports are dismantled before construction of second-layer liner. Calculation model for dismantling temporary supports based on force equilibrium is developed and the variations of the internal forces in initial liners of large span tunnel during temporary supports dismantling is studied with increment method. A tunnel excavated with Glasses Method in Gu-Xuan section of Nanjing subway is used as an example. The influences of dismantling sequence on the internal forces of large span tunnel with different cross section sizes are analyzed and reasonable dismantling scheme is proposed. The one-time dismantled length is also obtained with 3D calculation.

关 键 词：隧道工程 大跨度 复合式衬砌 增量法 拆撑分析 

分 类 号：TU74[建筑科学—建筑技术科学]