上软下硬地层大直径盾构下穿建筑群施工技术研究

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中图分类号：U231.3；TU746 文献标志码：A 文章编号：1003-5168（2025）19-0055-06

DOI：10.19968/j.cnki.hnkj.1003-5168.2025.19.011

Construction Technology of Large-Diameter Shield Tunneling Underneath Building Clusters in Upper-Soft and Lower-Hard Stratum

AN Puzhen1.2 （1.Liaoning Technical University，Fuxin 1230o0， China; 2.Wenchang International Aerospace City，Wenchang5713oo，China）

Abstract： [Purposes] To address the construction challenges encountered when the tunnel of the Pearl River Delta Intercity Railway Pazhou Branch Line project passes underneath dense building clusters， research on construction technology for large-diameter shield tunneling in upper-soft and lower-hard strata was conducted.[Methods] An overall scheme comprising "temporary occupant relocation + building and ground reinforcement + shield propulsion control + tail void grouting + intensified monitoring + contingency plans + building appraisal and assessment" was proposed. Combined with on-site construction conditions，active measures such as building and ground reinforcement，optimization of tunneling parameters，and muck control were implemented.A numerical model was established and its rationality was verified against monitoring data.A comparative numerical simulation analysis of building settlement under both reinforced and unreinforced conditions was performed.[Findings] The results indicate that after implementing the reinforcement measures，the building settlement rate decreased，and the maximumsettlement was reduced by 7.5% .[Conclusions] Through the implementationof the overall scheme， not only was the safety of the buildings above the shield tunnel ensured，but the smooth progress of the shield tunneling construction was also guaranteed. Upon completion of construction，the maximum cumulative settlement was 15.7mm ，effectively avoiding the need for building demolition.This provides a reference for similar engineering projects.

Keywords： upper-soft and lower-hard; large-diameter shield; building cluster; numerical simulation; monitoring data

0 引言

近年来，随着经济的发展，以及人民出行需求的日益增长，交通类基础设施建设得到了大规模开展，盾构法因其具有施工速度快、安全性能好、施工扰动小等特点[1，被广泛应用于隧道工程施工领域。（剩余6966字）