市政隧道竖向扩建施工下层隧道技术研究  

Research on Vertical Expansion Construction Technology for Lower Layer Tunnels in Municipal Tunnels

作　　者：刘晓树[1] LIU Xiaoshu(China Railway 18th Bureau Group Co.Ltd.,Fuzhou Fujian 350000,China)

机构地区：[1]中铁十八局集团有限公司,福建福州350000

出　　处：《铁道建筑技术》2025年第2期178-181,共4页Railway Construction Technology

基　　金：中铁十八局集团有限公司科技研究开发计划项目(CR18GK-24-S-p-10)。

摘　　要：既有象山隧道拓宽改造工程面临诸多挑战,如围岩复杂多变、紧邻市政道路和周边建筑物多等。为确保施工安全和进度,提出两种施工方案:方案一采用台阶法分部开挖,但工期较长;方案二在中板预留孔口,以增加下层隧道施工作业面。经综合对比分析,采用方案二可有效缩短工期,降低综合施工成本,经济效益和社会效益显著。针对下层隧道开挖断面大、需采用控制爆破的特点,提出加强对周边建筑物监控量测及保护工作的建议。The widening and renovation project of the existing Xiangshan Tunnel faces many challenges,such as complex and variable surrounding rocks,proximity to municipal roads,and numerous surrounding buildings.In order to ensure the safety and progress of construction,two construction plans were proposed.Plan 1 adopts the bench method for partial excavation,but the construction period is relatively long.Plan 2 reserves holes in the middle board to increase the working surface for the lower layer tunnel excavation.Through comprehensive comparative analysis,it shows that the adoption of Plan 2 can effectively shorten the construction duration,reduce comprehensive construction costs,and create remarkable economic and social benefits.Suggestions are proposed to strengthen monitoring,measurement,and protection of surrounding buildings in response to the characteristics of large excavation sections and the necessity of controlled blasting in the lower tunnel.

关 键 词：隧道拓宽改造 方案比选 中板 预留孔口 下层隧道 爆破施工 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]