双线盾构顺序下穿铁路箱涵的实例研究  

Case Study on the Twin Shield Tunneling Sequence Construction Undercrossing the Railway Box Culvert

作　　者：李涛[1] 刘波[1] 朱连华[1] 窦海洋[1] 陈慧娴[1] 王昕鹏[1] 

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《太原理工大学学报》2013年第3期373-377,共5页Journal of Taiyuan University of Technology

基　　金：国家自然科学基金资助项目(50974126);博士点基金新教师类项目(20100023120003);中央高校基本科研业务费专项资金项目(2009QL02)

摘　　要：以北京市轨道交通6号线某区间盾构隧道工程实例为背景,对该工程进行数值模拟,分析了先后盾构掘进两条平行隧道对地表沉降的影响,以及顺序盾构掘进对既有铁路箱涵沉降的影响;结合现场实测结果,获得了双线盾构顺序穿越铁路箱涵过程中地表沉降的变化规律。结果表明:顺序掘进两条平行隧道时,地表沉降量最大值出现在两条隧道中心线偏向后行隧道约D/2的位置;后掘进隧道盾尾建筑空隙产生的沉降比小于先行掘进隧道;双线隧道顺序下穿铁路箱涵使箱涵本身的沉降曲线出现两次较为明显的沉降段和稳定段;实例分析证明,数值模拟方法和控制措施合理有效,有一定的实用价值。The ground settlements were assessed numerically with the project of Beijing subway line 6 as the background when two parallel tunnels shield drove successively.The influences of twin shield tunneling on the settlements of the railway box culvert were analyzed numerically.Combined with the field test results,the curve of ground settlement during the tunnels-driven undercrossing the railway box culvert successively was obtained.The result shows that the maximum ground settlement was at the position where the center line of the two tunnels tended back shield tunneling about D/2.The settlement ratio caused by shield-end structural spacing of back shield tunneling was less than the priority one of shield tunneling.And the displacement curve of the railway box culvert had two obvious decline phases and two obvious horizontal phases during when the twin shield tunneling sequence construction undercrossing the culvert.The case study shows that the numerical method and measures presented for ground movement control are reasonable and reliable,and valuable for understating tunneling undercrossing the existing structures.

关 键 词：双线盾构 铁路箱涵 数值计算 现场监测 

分 类 号：TU433[建筑科学—岩土工程]