长干1号大跨度隧道浅埋偏压段开挖模拟分析.pdf

学兔兔 公路交通技术 2010年12月 第6期 Technology of Highway and Transport Dec．2010 No．6 长干1号大跨度隧道浅埋偏压段开挖模拟分析 林良活 (广东省路桥建设发展有限公司，广州 510635) 摘 要：隧道浅埋偏压段地层较薄，多属于强风化带，围岩一般较破碎，且通常夹有土层，在目前以新奥法设计、 施工的隧道中是控制段之一。以安徽省黄山市黄(山)塔(岭)高速公路上的长干1号隧道浅埋偏压段为依托工程，选 取一个典型断面即冲沟沟底K13+610处，运用有限元分析软件对其开挖过程和支护结构的性状进行仿真模拟分 析，找出危险断面上的重点控制部位以便施工。分析结果显示，按给定的条件和参数，隧道施工开挖和支护安全 并有富余。 关键词：隧道浅埋偏压；有限元；模拟；结构受力 文章编号：1009—6477(201O)06—0096—05 中图分类号：U459．2 文献标识码：A Simulation Analysis for Excavation of Shallow Buried and Unsymmetrical Loaded Section in Changgan No．1 Large-span Tunnel LIN LianghUO Abstract：With thinner stratum，most of which in the field of intensified wind belt，and in general frac— tured wall rock，usually with entrainment of soil layers，the shallow buried and unsymmetrical loaded sec— tion of tunnel is one of sections to be controlled in tunnels designed and constructed by New Aus~ian Tunnelling Method(NATM)．Dependent on the project of shallow buried and unsymmetrical loaded sec— tion in Changgan No．1 Tunnel on Huangshan—Taling Expressway in Huangshang City，Anhui Province， this paper selects one typical cross section，i．e．1ocation K13-t-610 on the bottom of gully and performs a simulation analysis for its process of excavation and properties of supporting structure by means of finite element analysis software，and finds out key control parts on dangerous cross section．The results of anal- ysis show that the excavation and supporting of tunnel are safe and have margin based on the given condi- tions and parameters． Key words：shallow bury and unsym metrical Ioad in tunnel；finite eleme