小净距换乘通道施工对既有车站隧道及地表影响研究  

Study on the Influence of Small Clearance Transfer Channel Construction on Existing Station Tunnel and Surface

作　　者：缪振畴[1] 赵东平[2,3] 朱龙 刘晓贺 MIU Zhenchou;ZHAO Dongping;ZHU Long;LIU Xiaohe(Sinohydro Bureau 5 Co.,LTD.,Chengdu Sichuan 610066;School of Civil Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031;Key Laboratory of Traffic Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu Sichuan 610031)

机构地区：[1]中国水利水电第五工程局有限公司,四川成都610066 [2]西南交通大学土木工程学院,四川成都610031 [3]西南交通大学交通隧道工程教育部重点实验室,四川成都610031

出　　处：《四川水力发电》2024年第2期141-146,151,共7页Sichuan Hydropower

摘　　要：联络通道小净距上跨施工会对既有车站隧道及地表产生不利影响,合理的开挖方法可以有效控制施工产生的不利影响。以重庆轨道交通4号线西延伸段玉带山站换乘通道上跨工程为依托,采用三维数值方法,研究了全断面法与上下台阶法两种工法条件下换乘通道开挖对既有车站及周边环境的影响。研究结果表明:换乘通道的开挖会导致车站隧道支护结构安全性降低。换乘通道的开挖会引起地表沉降的增大与沉降槽的最低点由车站隧道正中向换乘通道一侧偏移,偏移量的值约在2.8~5.7 m。综合比较两种工法,在实际工程中推荐换乘通道初始开挖阶段(L1、L2段)采用台阶法施工,避开较大影响区以后,采用全断面法施工,可以在保障安全的前提下兼顾施工效率。The construction of the small clearance upper span of the communication channel will have adverse effects on the existing station tunnels and the ground surface.Reasonable excavation methods can effectively control the adverse effects of construction.Based on the upper span project of the transfer channel of Yudaishan Station in the west extension section of Chongqing Rail Transit Line 4,the three-dimensional numerical method is used to study the influence of the excavation of the transfer channel on the existing station and the surrounding environment under the conditions of the full-section method and the upper and lower step method.The results show that the excavation of transfer channel will reduce the safety of station tunnel support structure.The excavation of the transfer channel will increase the surface settlement and the lowest point of the settlement trough will shift from the center of the station tunnel to one side of the transfer channel,and the offset value is about 2.8~5.7 m.By comprehensively comparing the two construction methods,it is recommended to adopt the upper and lower step method in the initial excavation stage(L1 and L2 sections)of the transfer channel in the actual project.After avoiding the large impact area,the full section method is adopted for construction,which can take into account the construction efficiency under the premise of ensuring safety.

关 键 词：暗挖施工 换乘通道 小净距 上跨施工 车站隧道 

分 类 号：U459[建筑科学—桥梁与隧道工程]