西岭隧道斜井进正洞挑顶施工技术  

Top Picking Construction Technology of Inclined Shaft Connection to Main Tunnel of Xiling Tunnel

作　　者：徐洪流 郑向南 张煦宁 XU Hongliu;ZHENG Xiangnan;ZHANG Xuning(China Railway Seventh Group Co.,Ltd.,Zhengzhou Henan 450000,China)

机构地区：[1]中铁七局集团有限公司,河南郑州450000

出　　处：《铁路技术创新》2024年第6期10-20,共11页Railway Technical Innovation

摘　　要：在高速铁路斜井进正洞施工中,通常由小断面进入大断面,存在开挖断面的转换。施工中常存在拱顶严重超挖,造成初期支护荷载较大,需要通过初期支护拱架的合理布置,优化初期支护结构受力。基于西十高铁西岭隧道1#斜井挑顶施工实践,结合模型受力分析,从循环开挖爆破控制、拱架受力传递结构设计、拱架安装关键点控制等方面,阐述合理的挑顶施工控制技术,提炼安全施工技术要点。在理论结合实践的基础上,进一步提升挑顶施工作业的安全风险控制水平,有助于降低高速铁路施工高风险工点工序安全事故概率。In the construction of inclined shaft connection to main tunnel of high speed railway,it is usually from small section to large section,and there is a conversion of excavation section.Serious over-excavation of arch crown often occurs during construction,resulting in large load of primary support.It is necessary to optimize the stress of primary support structure through reasonable arrangement of primary support arch frame.Based on the top picking construction practice of 1#inclined shaft of Xiling Tunnel on Xi’an-Shiyan HSR and in combination with model stress analysis,this paper expounds reasonable top picking construction control technology and refines key points of safe construction technology from aspects such as blasting control of cyclic excavation,structural design of arch frame stress transmission and key point control of arch frame installation.On the basis of combining theory with practice,this paper further improves the safety risk control level of top picking construction operations,which is conducive to reducing the probability of safety accidents at high-risk working points and processes in high speed railway construction.

关 键 词：西岭隧道 初期支护 斜井 正洞 挑顶施工 

分 类 号：U455[建筑科学—桥梁与隧道工程]