(1 北京市轨道交通建设管理有限公司, 北京 100068; 2 城市轨道交通全自动运行系统与安全监控北京市重点实验室, 北京 100068)

摘要: 为解决城市地铁隧道极小间距下穿上方构筑物结构变形控制的工程难题,剖析了下穿工程风险特点并设定初步变形控制策略,通过精细化数值模拟研究地铁双区间下穿既有盾构隧道结构变形预测和控制效果. 着重分析下穿工程段的关键风险和影响区域,基于现场监测数据验证了超前支护、优化开挖方法及盾构结构加强的联合控制措施的可行性. 研究结果表明,地铁双区间中心截面周边±30m 是控制施工扰动和盾构结构变形的重点区域,超前管棚具有纵向梁承载作用,深孔注浆具有横向拱承载作用,两者协同承载实现了较好的地层变形控制效果,使盾构结构变形控制在 5. 0mm 以内,可为类似工程提供参考.

关键词: 变形控制; 双区间盾构隧道; 数值模拟; 下穿工程

中图分类号:TU94+2 文献标志码:A 文章编号:1002-848X(2023)08-0148-06

DOI:10. 19701 / j. jzjg. 20222346

Structural deformation control measures and effect analysis of subway double-section underpassing existing shield tunnel

TANG Xi1,2

(1 Beijing Railway Construction and Management Co. , Ltd. , Beijing 100068, China; 2 Beijing Key Laboratoryof Fully Automatic Operation and Safety Monitoring for Urban Rail Transit, Beijing 100068, China)

Abstract: In order to solve the engineering problem of the structural deformation control of the urban subway tunnelunderpassing the upper structure with extremely small spacing, the risk characteristics of the underpassing engineering wereanalyzed and a preliminary deformation control strategy was set up, and the structural deformation prediction and controleffects of existing shield tunnel under the subway double-section was studied through refined numerical simulation. Focusingon the analysis of the key risks and affected areas of the underpassing engineering section, the feasibility of the joint controlmeasures of advanced support, optimized excavation method and shield structure reinforcement was verified based on on-sitemonitoring data. The research results show that the ±30m area around the central section of the subway double-section isthe key area to control construction disturbance and shield structure deformation. The advanced pipe shed has the bearingfunction of the longitudinal beam, and the deep hole grouting has the bearing function of the transverse arch. The jointbearing of the two has achieved a better effect of controlling the deformation of the ground, and the deformation of the shieldstructure is controlled within 5. 0mm, which can provide reference for similar engineering.

Keywords:deformation control; double-section shield tunnel; numerical simulation; underpassing engineering

作者简介:唐汐,硕士,高级工程师,主要从事城市轨道交通、项目管理,Email:349438318@ qq. com.

[引用本文] 唐汐. 地铁双区间下穿既有盾构隧道结构变形控制措施及效果分析[ J]. 建筑结构,2023,53(8):148-153. TANG Xi. Structural deformation control measures and effect analysis of subway double-section underpassingexisting shield tunnel [J]. Building Structure,2023,53(8):148-153.