基于HSS模型双线隧道上跨施工对既有地铁影响
Influence of Double Track Shield Tunnel Overpassing Construction on Existing Subways Based on HSS Model
李文乾 1黄高亮 2朱潇昂 1刘明洪 1陈俞超 3胡安峰3
作者信息
- 1. 中铁十局集团城市轨道交通工程有限公司,广东广州 510000
- 2. 杭州市建设工程质量安全监督总站,浙江杭州 310005
- 3. 浙江大学滨海和城市岩土工程研究中心,浙江杭州 310030
- 折叠
摘要
针对某新建盾构隧道近接上跨既有地铁项目,基于小应变硬化模型(HSS),建立了三维有限元模型,通过与实测数据和莫尔-库伦模型计算结果的对比,验证了HSS模型计算的可靠性和优越性.在此基础上,进一步分析了新建隧道施工引起的既有隧道竖向变形特征,及隧道水平净距和叠交角度两参数对既有隧道变形的影响规律.结果表明:HSS模型计算结果与实测值吻合较好,能有效预测既有地铁隧道的变形;在新建隧道上跨穿越的影响下,既有地铁隧道产生竖向隆起变形,且变形主要发生在盾构下穿前的 1.5 倍新建隧道直径到穿越后的 2 倍新建隧道直径范围内;既有地铁隧道隆起峰值点会随着盾构二次穿越而发生偏移,且其竖向变形曲线呈现出"双峰"趋势;增大双线隧道水平净距和新旧隧道叠交角度,都能使既有隧道的变形减小.
Abstract
A three-dimensional finite element model was established based on the HSS constitutive model for a newly construc-ted shield tunnel adjacent to an existing subway project.The correctness of the numerical calculation was verified by comparing it with measured data.On this basis,further analysis was conducted on the vertical deformation characteristics of existing tunnels caused by the construction of new tunnels,as well as the influence of the two parameters of tunnel horizontal clearance and overlap angle on the deformation of existing tunnels.The results show that the calculated results of HSS model are in good agreement with the measured values,and can effectively predict the deformation of existing subway tunnel.Under the influence of the new tunnel overpassing,the existing subway tunnel has vertical uplift deformation,and the deformation mainly occurs in the range of 1.5 times the diameter of the new tunnel before the shield tunneling under-crossing to 2 times the diameter of the new tunnel after the crossing.The uplift peak point of the existing subway tunnel will shift with the second crossing of the shield,and its vertical deformation curve shows a"double peak"trend.Increasing the horizontal clearance of double track tunnels and the overlapping angle of new and old tunnels can reduce the de-formation of existing tunnels.
关键词
盾构隧道/上跨穿越/隧道竖向位移/数值计算/HSS本构模型Key words
shield tunneling/shield overpassing/vertical displacement of tunnel/numerical calculation/HSS constitutive model引用本文复制引用
出版年
2024
NETL
NSTL
万方数据