双线盾构近距下穿既有桥梁桩基的位移控制研究  

Displacement Control in Twin-tunnel Shield Undercrossing Existing Bridge Piles under Close Proximity Conditions

作　　者：赵培杰 ZHAO Pei-jie(China Railway 15th Bureau Group Underground Engineering Co.,Ltd.,Yangzhou 225000,China)

机构地区：[1]中铁十五局集团地下工程有限公司,扬州225000

出　　处：《价值工程》2025年第10期116-119,共4页Value Engineering

摘　　要：针对盾构隧道近距离下穿施工对既有桥桩及盾构安全的影响问题,本研究以广州地铁双线穿越互通立交桥工程为背景,提出袖阀管注浆隔离技术,并基于数值模拟对比分析直接穿越与隔离措施下桥桩位移响应规律。结果表明:盾构穿越过程中,桥桩水平与竖向位移呈渐进累积特征,最大水平位移集中于两侧桥墩,最大竖向位移则显现在中部桥桩;采用袖阀管注浆隔离后,桥桩位移显著减小,有效保障了盾构施工与桥梁结构安全;隔离措施实施后,后续穿越桥桩位移较首批穿越桥桩进一步降低,表明隔离技术具有位移传递衰减效应。研究成果为类似隧道近接桥梁工程提供了理论依据与工艺参考。In response to the safety risks posed by shield tunneling in close proximity to existing bridge piles,this study investigates the Guangzhou Metro twin-tunnel undercrossing project beneath an interchange bridge.A sleeve-valve pipe grouting isolation technique is proposed,and numerical simulations are conducted to compare the displacement responses of bridge piles under direct tunneling and grouting isolation scenarios.The results demonstrate that during shield advancement,both horizontal and vertical displacements of bridge piles exhibit progressive accumulation,with maximum horizontal displacements concentrated at side piers and maximum vertical displacements observed in central piles.The implementation of grouting isolation significantly reduces pile displacements,ensuring both tunneling safety and bridge structural integrity.Furthermore,subsequent pile displacements after isolation measures are further reduced compared to initial tunneling phases,indicating a displacement attenuation effect induced by the isolation technology.These findings provide theoretical and practical guidance for similar tunnel-bridge proximity engineering projects.

关 键 词：盾构 近距穿越 桥桩 隔离措施 位移控制 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]