大直径盾构始发端头加固区域隧道变形差异特征实测研究
杨光1高俊华1甘彬霖2黄忠凯3张吾渝4张冬梅2,3,4
Measurement Study on Characteristics of Tunnel Deformation Differences in Reinforced Area of Large-diameter Shield Originating End
YANG Guang1GAO Junhua1GAN Binlin2HUANG Zhongkai3ZHANG Wuyu4ZHANG Dongmei2,3,4
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作者信息:1.中交隧道工程局有限公司上海机场联络线项目部，211106，南京
2.同济大学上海自主智能无人系统科学中心，200092，上海
3.同济大学土木工程学院，200092，上海
4.青海大学土木水利学院，810016，西宁
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Affiliation:1.Project Department of Shanghai Airport Link Line, CCCC Tunnel Engineering Bureau Co., Ltd., 211106, Nanjing, China
2.Shanghai Research Institute for Intelligent Autonomous Systems, Tongji University, 200092, Shanghai, China
3.College of Civil Engineering, Tongji University, 200092, Shanghai, China
4.College of Civil Engineering and Water Resources, Qinghai University, 810016, Xining, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.07.020
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中图分类号/CLCN:U455.43
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栏目/Col:研究报告
摘要:
［目的］为保证盾构顺利始发，通常对始发工作井周围区域进行局部地层加固，导致加固区域两侧隧道变形存在差异，影响隧道结构安全，但目前变形差异特征及其规律尚不明确，因此有必要对大直径盾构始发端头加固区域隧道变形的差异特征进行实测研究。［方法］以上海市域铁路机场联络线大直径盾构隧道工程为例，基于现场实测数据，分析了始发工作井加固区域盾构掘进施工地面竖向变形、隧道竖向变形、隧道横向收敛的差异特征，分析了地层局部加固对软土地层大直径盾构隧道掘进差异变形的影响规律。［结果及结论］地层局部加固导致盾构隧道变形响应差异显著；地面竖向变形发展由非加固区的扰动沉降、卸荷隆起、固结沉降和相对稳定4个阶段，转变为加固区的扰动沉降、卸荷隆起和相对稳定3个阶段；对于隧道竖向变形，非加固区一侧以波动上浮为主，加固区以沉降为主，导致临界区域差异沉降达到0.022%Ls(Ls为隧道轴线两个监测点间距)，超过管片结构差异沉降预警值；对于隧道横向收敛，加固区隧道结构呈竖鸭蛋变形特征，非加固区呈横鸭蛋变形特征；施工中，应重点防范临界区域管片结构差异沉降和差异收敛造成的环缝螺栓剪切破坏和螺栓孔混凝土损伤。
Abstracts:
［Objective］ To ensure the smooth launch of shield tunneling, local ground reinforcement is usually carried out around the originating shaft, resulting in differences in tunnel deformation on both sides of the reinforced area, which can affect tunnel structural safety. However, the characteristics and law of deformation differences are still unclear yet. Hence, it is necessary to conduct a field measurement study on the characteristics of tunnel deformation differences in the reinforced area at large-diameter shield tunnel originating end. ［Method］ Taking the large-diameter shield tunnel project on Shanghai City Railway Airport Link Line as example, based on field measurement data, the differential characteristics of shield excavation construction ground vertical deformation, tunnel vertical deformation, and tunnel lateral convergence in the reinforced area of the originating shaft are analyzed. The influence law of local ground reinforcement on deformation differences during large-diameter shield tunnel excavation in soft soil stratum is investigated. ［Result & Conclusion］ Local ground reinforcement leads to significant differences in shield tunnel deformation response. The development of ground vertical deformation transitions from 4 stages (disturbance settlement, unloading uplift, consolidation settlement, and relative stability) in the non-reinforced area to 3 stages (disturbance settlement, unloading uplift, and relative stability) in the reinforced area. For tunnel vertical deformation, fluctuating uplift dominates on the non-reinforced side, while settlement dominates in the reinforced area, causing a differential settlement of 0.022% Ls (Ls as the distance between 2 monitoring points along tunnel axis) in the critical area reaching, exceeding the warning value for differential settlement of segmental structures. Regarding tunnel lateral convergence, the reinforced area tunnel structure exhibits a vertical egg-shaped deformation, while a horizontal egg-shaped deformation in the non-reinforced area. During construction, particular attention should be paid to preventing shear damage to circumferential joint bolts and concrete damage to bolts holes caused by segmental structure settlement and convergence differences in the critical area.
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