大直径盾构下穿运营地铁隧道施工变形控制技术分析

Analysis of deformation control technology for large diameter shield tunneling under operating metro tunnel

摘要

在城市地下空间高强度开发背景下，大直径盾构下穿既有运营地铁已成为不可回避的工程形态，其施工扰动具有作用范围广、应力重分布强和结构响应高度耦合等典型特征。本文以地层应力再分布、土体体积损失传递及盾构—地铁结构动力耦合机理为理论基础，系统解析了大直径盾构下穿条件下既有地铁隧道产生附加变形的内在演化路径，并在此基础上构建了多维协同控制体系，旨在为复杂下穿工况下既有地铁隧道变形的可控化与可预期化提供系统性技术路径。

Abstract

Under the context of intensive urban underground space development, large-diameter shield tunneling beneath existing operational metro lines has become an unavoidable engineering practice. The construction-induced disturbances exhibit three key characteristics: extensive impact range, pronounced stress redistribution, and highly coupled structural responses. This study systematically analyzes the intrinsic evolution path of additional deformation in existing metro tunnels under large-diameter shield tunneling conditions, based on theoretical foundations including stratum stress redistribution, soil volume loss transfer, and dynamic coupling mechanisms between shield and metro structures. Building upon this analysis, a multidimensional collaborative control system is constructed to provide a systematic technical approach for controllable and predictable deformation management of existing metro tunnels under complex tunneling scenarios.

关键词

大直径盾构 / 地铁隧道 / 施工变形 / 控制技术

Key words

large-diameter shield / subway tunnel / construction deformation / control technology

参考文献

[1] 金典琦, 李德行, 黎莉, 等. 超大直径盾构隧道正交下穿对既有地铁隧道影响分析[J]. 建筑结构, 2023, 53(S01):2952-2959.

[2] 周群, 邵华, 李家平. 超大直径盾构下穿施工引起既有地铁隧道变形分析及控制要点[J]. 城市轨道交通研究, 2024, 27(S01):79-83.

[3] 周群, 邵华, 李家平. 超大直径盾构下穿施工引起既有地铁隧道变形分析及控制要点[J]. 城市轨道交通研究, 2024, 27(S01):79-83.