浅埋偏压小净距隧道施工工法影响研究  

Study on the Influence of Construction Method of Shallow Embedded and Bias Tunnel with Small Interval

作　　者：马洪龙 Ma Honglong(China Railway 17th Bureau Group(Guangzhou)Construction Co.,Ltd.,Guangzhou,China)

机构地区：[1]中铁十七局集团(广州)建设有限公司,广东广州

出　　处：《科学技术创新》2023年第2期149-154,共6页Scientific and Technological Innovation

摘　　要：合理确定软弱破碎岩体条件下浅埋偏压小净距隧道的开挖方法是保证隧道顺利施工和后期安全运行的重要保证,以都安高速公路T29合同段林场隧道开挖工程为研究背景,利用有限差分软件FLAC3D对CD法和三台阶七步法进行数值模拟比较,分析不同工法隧道施工过程对其自身结构及周边围岩的影响。结果表明,采用CD法施工可以显著减少拱顶沉降及地表沉降,更有利于中夹岩柱的稳定性。研究成果可为今后类似工程提供借鉴。It is an important guarantee for the smooth construction and safe operation of the tunnel to determine the excavation method of shallow tunnel with partial pressure and small interval under the condition of soft wall rock. Taking the Linchang tunnel excavation project of T29 contract section of du’an Expressway as the research background, uses the finite difference software FLAC3D to simulate and compare the CD method and three-bench seven-step method, and analyzes the influence of different construction methods on its own structure and surrounding rock. The results show that the construction of CD method can significantly reduce the vault settlement and surface settlement, which is more beneficial to the stability of the middle rock column. The research results can provide reference for similar projects in the future.

关 键 词：浅埋偏压小净距隧道 中夹岩 CD法 三台阶七步法 数值模拟 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]