盾构施工下穿建筑物时诱发沉降数值分析及预测  

Numerical Analysis and Prediction of Settlement Induced During Shield Construction Underneath Buildings

作　　者：龙际权 LONG Jiquan(China Railway 18th Bureau Group Third Engineering Co.,Ltd.,Zhuozhou,Hebei 072750,China)

机构地区：[1]中铁十八局集团第三工程有限公司,河北涿州072750

出　　处：《施工技术(中英文)》2025年第7期19-24,共6页Construction Technology

基　　金：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%。The settlement of ground raft foundations caused by shield tunnel construction is studied based on numerical simulation and multiple regression.A regression model was established and verified by taking Nanchang Metro Line 4 as an example,considering factors such as excavation diameter,tunnel depth,foundation-tunnel spacing,foundation roof pressure,soil elastic modulus,etc.The results indicate that the raft settlement decreases with the increase in spacing,buried depth,and soil modulus and increases with the increase in excavation diameter and roof pressure.When the spacing is 23m,the settlement is reduced by 83.5%compared with the direct undercrossing.The settlement is about 5.75mm when the excavation diameter is 6.5m.The settlement is reduced by 38.4%when the buried depth increases 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%.

关 键 词：地铁 隧道 盾构 多元回归分析 数值模拟 沉降 

分 类 号：U453.5[建筑科学—桥梁与隧道工程]