超大直径盾构穿越大堤加固三维数值模拟研究——以季华西路延线工程为例  

Three-Dimensional Numerical Simulation of Reinforcement of Dam Crossed by Overlarge-Diameter Shield Used in Jihua West Road Extension Line

作　　者：李志锋 江俊 温瑜琴 苏栋[2,3,4] 曾国东 杨腾宇 余洪鑫 LI Zhifeng;JIANG Jun;WEN Yuqin;SU Dong;ZENG Guodong;YANG Tengyu;YU Hongxin(Foshan Jianying Development Co.,Ltd.,Foshan 528313,Guangdong,China;College of Civil and Transportation Engineering,Shenzhen University,Shenzhen 518060,Guangdong,China;Key Laboratory for Resilient Infrastructures of Coastal Cities(MOE),Shenzhen University,Shenzhen 518060,Guangdong,China;Shenzhen Key Laboratory of Green,Efficient and Intelligent Construction of Underground Metro Station,Shenzhen University,Shenzhen 518060,Guangdong,China;Foshan Transportation Science and Technology Co.,Ltd.,Foshan 528315,Guangdong,China)

机构地区：[1]佛山市建盈发展有限公司,广东佛山528313 [2]深圳大学土木与交通工程学院,广东深圳518060 [3]滨海城市韧性基础设施教育部重点实验室(深圳大学),广东深圳518060 [4]深圳市地铁地下车站绿色高效智能建造重点实验室,广东深圳518060 [5]佛山市交通科技有限公司,广东佛山528315

出　　处：《隧道建设（中英文）》2023年第S02期122-128,共7页Tunnel Construction

基　　金：深圳市高等院校稳定支持计划(20220808143139001);国家自然科学基金(51938008);广东省交通运输厅科研项目(2022-QD3-03);深圳大学2035追求卓越研究计划(2022B007)。

摘　　要：为探明经地层预加固后的大直径盾构工程地层变形机制,以佛山市季华路西延线盾构工程堤坝保护为背景,开展经地层预加固后的浅埋大直径盾构穿越大堤的三维数值仿真分析,探究不同地层加固方案对地层的变形控制效果。结果表明:1)隧道上方土体预加固有效控制了盾构掘进引起的土体变形,地层加固后最大使地表最大沉降值降低约50%;2)旋喷桩加固深度以加固到隧道底部为最优,但加固到拱顶、拱腰、拱底3种不同加固深度对地层变形控制效果相近,可基于经济高效等原则合理选择;3)沿掘进方向的不同加固长度对已处于加固区域土体的变形影响较小,根据穿越长度布置旋喷桩加固区域即可。To explore the ground deformation mechanism after pre-reinforcement induced by overlarge-diameter shield tunneling,a case study is conducted on a shield tunneling in Jihua west road extension line crossing underneath a dam.Three-dimensional numerical simulation is conducted to examine the ground settlement control effect by various ground reinforcement schemes.Findings are as follows:(1)The soil deformation is effectively controlled by prereinforcing the soil above the shield tunnel,and the maximum surface settlement decreases by approximately 50%after the ground reinforcement.(2)The optimal reinforcement depth is reinforcing to the bottom of the tunnel by jet grouting piles.However,the three different reinforcement depths to the arch,the arch waist,and the arch bottom have similar control effects on the ground deformation,which can be rationally selected based on the principle of economy and efficiency.(3)The different reinforcement lengths along the shield advancing direction affect the deformation of reinforced area,thus,the reinforcement area can only be determined according to the crossing length.

关 键 词：超大直径盾构隧道 粉细砂地层 堤坝保护 地表沉降 地层加固 

分 类 号：U45[建筑科学—桥梁与隧道工程]