中铁十八局集团第三工程有限公司专栏 2025年 第卷 第07期

DOI: 10.7672 / sgjs2025070019

盾构施工下穿建筑物时诱发沉降数值分析及预测

龙际权

作者简介：

龙际权，工程师，硕士，E⁃mail:dudule08@ 163. com

作者单位：

中铁十八局集团第三工程有限公司，河北涿州 072750

基金项目：

∗中国铁建股份有限公司 2022 年度科技研究开发计划（ 2022⁃C1）；中铁十八局集团有限公司 2022 年度科研创新项目（C2022⁃051）

摘要：

基于数值模拟和多元回归，研究盾构隧道施工引起的地表筏板基础沉降。考虑开挖直径、隧道埋深、基础⁃隧道间距、基础顶板压力及土层弹性模量等因素，建立回归模型并以南昌地铁 4 号线为例进行验证。结果显示，筏板沉降随间距、埋深及土层模量增大而降低，随开挖直径和顶板压力增大而增大；当间距为 23m 时，沉降比直接下穿减少 83. 5%,开挖直径 6.5m 时沉降约 5. 75mm,埋深由 15m 增至 21m 时沉降降低 38.4%,土层模量降低至 0.5E时沉降激增 73%,提升至 1.5E 时降低 28%.
地铁；隧道；盾构；多元回归分析；数值模拟；沉降

English：

The settlement of ground raft foundations caused by shield tunnel construction is studied basedon numerical simulation and multiple regression. A regression model was established and verified bytaking Nanchang Metro Line 4 as an example, considering factors such as excavation diameter, tunneldepth, foundation⁃tunnel spacing, foundation roof pressure, soil elastic modulus, etc. The resultsindicate that the raft settlement decreases with the increase in spacing, buried depth, and soil modulusand increases with the increase in excavation diameter and roof pressure. When the spacing is 23m, thesettlement is reduced by 83. 5% compared with the direct undercrossing. The settlement is about 5.75mmwhen the excavation diameter is 6.5m. The settlement is reduced by 38. 4%when the buried depthincreases from 15m to 21m. When the soil modulus is reduced to 0.5E, the settlement surges by 73%.And when the soil modulus is increased to 1.5E, the settlement is reduced by 28%.