邻近既有建筑浅埋隧道扩挖施工方案比选  

Comparison and Selection of Construction Schemes for Enlarging and Excavating Shallow-buried Tunnels Adjacent to Existing Buildings

作　　者：陈智威 CHEN Zhiwei(Fujian Expressway Science and Technology Innovation Research Institute Co.,Ltd.,Fuzhou 350001,China)

机构地区：[1]福建省高速公路科技创新研究院有限公司,福州350001

出　　处：《路基工程》2025年第1期190-194,共5页Subgrade Engineering

摘　　要：依托采用中洞法扩建的某隧道工程,建立数值模型对中洞先行与双侧导坑先行两种方案的施工过程开展模拟分析,研究目标断面在不同施工工序下拱顶沉降、水平收敛以及中洞收敛随施工步的变化。结果表明:中洞先行方案早于双侧导坑先行方案形成闭合拱结构,整体承载能力较强,施工过程中拱顶沉降较小;双侧导坑方案的水平收敛及中洞收敛均优于中洞先行方案,但施工过程中存在明显偏压现象。若扩建后隧道主要承受竖向荷载时,建议采用中洞先行施工方案;若竖向荷载较小,水平应力较大时,建议采用双侧导坑先行方案。Relying on a tunnel project expanded by the middle hole method,a numerical model is set up to simulate and analyze the construction process of the center-hole-first and double-side-guide-pit-first schemes,and to study the changes of the arch settlement,horizontal convergence,and center-hole convergence of the target section with the construction steps under different construction processes.The results show that:the center-hole-first scheme forms a closed arch structure earlier than the double-side-guide-pit-first scheme,which has a stronger overall bearing capacity and smaller arch settlement during the construction process;while the horizontal convergence and center-hole convergence of the double-side-guide-pit scheme are better than that of the center-hole-first scheme,but there is an obvious bias pressure phenomenon during the construction process.If the expanded tunnel is mainly subject to vertical load,it is recommended to adopt the center tunnel first construction plan;if the vertical load is small and the horizontal stress is large,it is recommended to adopt the double side guide pit first plan.

关 键 词：城市中心 浅埋隧道 扩建 方案比选 承载力 

分 类 号：U455.411[建筑科学—桥梁与隧道工程]