浅埋偏压小净距隧道掌子面施工错距优化研究

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中图分类号：U452；TQ170.1+5 文献标志码：A 文章编号：1001-5922（2025）10-0203-04

Research on staggered distance optimization of shallow buried bias small spacing tunnel face construction

CHEN Jingbo'， CHEN Jiazheng²³，LI Zhong²3

（1. China Communications Construction Rail Transit Branch Co.，Ltd.，Beijing 1013Oo，China; 2.Shijiazhuang Tiedao University， Shijiazhuang O5oO43，China; 3.Key Laboratory of Roads and Railway Engineering Safety Control，Shijiazhuang O5oo43，China）

Abstract：Whenthesmall spacing tunnel is in thecomplex terainconditionof shallow buried bias，thedeformationand stress superposition of the surrounding rock of the tunnel are seriously affcted by thesmall spacing between the left and right holes，and the construction safety hazards are multiplied.In order to reduce the superimposed influence caused by the excavation of the left and right holes，the appropriate construction stagger distance should beselected to controlthe deformation and stress of the surounding rock and ensurethe stabilityof the surrounding rock.Taking the tunnel entrance section of Yiliang section of Chongqing-Kunming high-speed railway as theengineering background，FLAC3Dnumerical simulation is used tosimulate theinfluence of diffrentconstructionstagger distances ofleft and right tunnelfaces onthestabilityof surounding rock，andthe appropriateconstructionstagger distance of tunnel face isselected through comparativeanalysis.Theresults showthat the construction distanceof theleftand right tunnelfaceof theshallow buried biassmall clear distance tunnel inYiliang section should be kept at 50m or more. The research can provide reference value for the construction of this project.

Key words：shallow buried; bias voltage;smallspacing tunnel; construction stagger distance of working face;numerical simulation

随着我国交通基建规模不断扩大，隧道建设得到迅速发展[1-3]，其中小净距隧道以施工工艺简单、经济成本低等优点得到大量应用[413]。（剩余4303字）