盾构隧道超小净距叠线地段支撑台车加固效果  

Reinforcement effect of support trolley in ultra-small clearance stacking line section of shield tunnel

作　　者：朱禹 龚怀世 罗业华 严晓周 曾梓越 李洪斌 曾勇[3] Zhu Yu;Gong Huaishi;Luo Yehua;Yan Xiaozhou;Zeng Ziyue;Li Hongbin;Zeng Yong(Guangzhou Metro Group Co.,Ltd.,Guangzhou 510300,Guangdong,China;The Second Engineering Company of CCC Fourth Harbor Engineering Co.,Ltd.,Guangzhou 510220,Guangdong,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,Sichuan,Chin)

机构地区：[1]广州地铁集团有限公司,广东广州510300 [2]中交四航局第二工程有限公司,广东广州510220 [3]西南交通大学土木工程学院,四川成都610031

出　　处：《岩土工程技术》2025年第1期113-121,共9页Geotechnical Engineering Technique

基　　金：四川省自然科学基金项目(2022NSFSC1153);中交第四航务工程局有限公司委托课题(2022-019)。

摘　　要：在盾构隧道超小净距上下叠线地段施工时,控制隧道管片变形与管片应力状态是确保盾构施工安全的关键。广州地铁十二号线采用支撑台车对先行隧道进行加固,为探明支撑台车的加固效果,利用有限差分软件FLAC 3D建立计算模型,针对未用加固措施与采用支撑台车两种情况下的隧道管片变形、管片应力状态沉降进行对比分析。结果表明:叠线地段盾构隧道施工时,隧道管片变形影响范围为与开挖面相距5 m左右;支撑台车对先行隧道加固效果显著,其管片竖向和横向最大变形分别减小42.7%和56.7%;支撑台车的应用使邻近既有隧道竖向变形减小14.4%~24.71%,有利于既有隧道运营安全;采用支撑台车不会导致管片开裂,仅引起管片局部出现应力集中现象。In the construction of shield tunnels within ultra-small clear distance stacked line sections,the control of the deformation and stress state of the tunnel lining segments is critical for ensuring construction safety.During the construction of Guangzhou Metro Line 12,the leading tunnel was reinforced using a support trolley.To examine the efficacy of this reinforcement,a computational model was developed utilizing the finite difference software FLAC 3D.Comparative analysis was conducted on the deformation and stress state settlement of tunnel segments under two conditions:without reinforcement measures and with the use of supporting trolleys.The findings indicated that the influence of tunnel segment deformation extended approximately 5 m from the excavation face.The application of the support trolley significantly reduced the maximum vertical and lateral deformations of the segments by 42.7%and 56.7%,respectively.Additionally,the vertical deformation of adjacent existing tunnels was reduced by 14.4%to 24.71%,thereby enhancing operational safety.Furthermore,the use of the support trolley did not induce cracking in the segments but resulted in localized stress concentrations.

关 键 词：盾构隧道 超小净距 叠线地段 支撑台车 管片变形 管片应力状态 

分 类 号：U455[建筑科学—桥梁与隧道工程]