基于轨迹交叉理论的软岩浅埋双连拱隧道施工安全风险控制  

Construction Safety Risk Control of Soft Rock Shallow-Buried Double-Arch Tunnel Based on Trajectory Intersection Theory

作　　者：赵金洪 陈绍清 刘恒瑞 张满 ZHAO Jinhong;CHEN Shaoqing;LIU Hengrui;ZHANG Man

机构地区：[1]重庆高新技术产业开发区城市建设事务中心,重庆401329 [2]重庆科技大学安全科学与工程学院,重庆401331

出　　处：《重庆建筑》2024年第7期46-48,54,共4页Chongqing Architecture

摘　　要：公路隧道的断面形式非常多,双连拱隧道结构由于复杂的工序控制要求,施工过程中安全隐患多,安全风险控制难度大等问题,在工程实际中应用相对较少。该文以科学城新森隧道为例,结合隧道埋深浅和围岩强度低的特点,根据双连拱隧道的施工方法,采用机械凿岩与控制爆破开挖相结合的工艺技术,严格控制中导洞混凝土墙趾地锚及水平横撑施作,精心管理导坑上下台阶长度和左右洞先后行作业面的距离,以及左右洞先后行开挖支护与二衬之间距离,限制了超挖操作的人为失误轨迹运行,避免了开挖掌子面围岩裸露段无支撑的环境工况轨迹出现过长,有效解决了浅埋隧道软岩掌子面岩石的稳定性问题,确保隧道施工短进尺、控台阶和早封闭,该隧道安全顺利完成对类似隧道项目的施工有重要的参考作用。The cross-sectional forms of highway tunnels are highly diverse.Due to the complex procedural control requirements,the double-arch tunnel structure is associated with numerous hidden safety hazards during construction and poses significant challenges for safety risk control,leading to its relatively limited application in practical engineering.Taking the Xinsen Tunnel in the Science City as an example,this paper integrates the characteristics of shallow burial depth and low surrounding rock strength.Based on the construction methodology of double-arch tunnels,a combined technology of mechanical rock drilling and controlled blasting excavation is adopted.Stringent measures are implemented to control the construction of anchor bolts and horizontal braces at the toe of the mid-pilot tunnel's concrete wall.Careful management is exercised over the lengths of the upper and lower benches of the pilot tunnel and the distances between the sequentially excavated working faces of the left and right tunnels,as well as the intervals between excavation,support,and secondary lining of the left and right tunnels.These measures limit the occurrence of human error trajectories related to over-excavation and prevent excessively long unsupported exposure of the excavation face's surrounding rock,effectively addressing the stability issues of the soft rock face in shallow-buried tunnels.By ensuring short excavation footage,controlled bench heights,and early closure,the safe and successful completion of this tunnel project provides crucial reference for similar tunnel construction projects.

关 键 词：软岩 浅埋 双连拱隧道 轨迹交叉 行为失误 围岩环境 

分 类 号：U455[建筑科学—桥梁与隧道工程]