盾构隧道的纵向结构弹性:表征和现场应用

IF 4.9 2区 工程技术 Q1 ENGINEERING, CIVIL Transportation Geotechnics Pub Date : 2024-09-14 DOI:10.1016/j.trgeo.2024.101373
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引用次数: 0

摘要

鉴于地下系统的急剧发展和对维护工作日益增长的需求,盾构隧道的纵向结构回弹性能是一个重要问题。本文提出了一种以纵向相对差异沉降作为隧道结构复原性能指标的新模型。弹性指标(Re)被定义为环境干扰期间残余性能综合面积与相应持续时间内正常性能综合面积之比。然后,将所提出的弹性分析模型应用于上海的一个有据可查的案例,即现有地铁隧道被新建的大直径盾构下穿隧道破坏,随后通过土壤注浆进行修复。分析了隧道沉降与施工参数和盾构机驾驶距离的关系。有效捕捉了隧道在中断和恢复过程中的性能退化特征。结果表明,在最初的 38 天内,32.3% 的性能损失归因于新的隧道下穿。注浆加固完成后,隧道性能从 0.677 提高到 0.868,约占穿越期间性能损失的 59.1%。此外,计算得出的弹性指标(Re)为 0.764,表明在这种情况下现有地铁隧道的弹性水平较高。此外,还讨论了基于隧道纵向沉降的其他性能指标,表明所提出的指标具有良好的合理性和适用性。
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Longitudinal structural resilience of shield tunnel: Characterization and field application

The longitudinal structural resilience performance of shield tunnels is an important concern given the dramatic development of underground systems and the increasing demand for maintenance work. In this paper, a new model using longitudinal relative differential settlement as the index of tunnel structural resilience performance is proposed. The resilience metric (Re) is defined as the ratio of the area integrated by the residual performance during environmental disruptions to the area integrated by the normal performance for the corresponding duration. Then, the proposed resilience analysis model is applied to a well-documented case in Shanghai, where the existing metro tunnel is disrupted by a newly constructed large-diameter shield tunnel undercrossing and subsequently repaired by soil grouting. The variations of tunnel settlement concerning construction parameters and driving distance of the shield machine are analyzed. The performance degradation characteristics of the tunnel during disruption and recovery are effectively captured. The results show that 32.3 % of the performance loss is attributed to the new tunnel undercrossing in the first 38 days. After the completion of the grouting reinforcement, the tunnel performance is improved from 0.677 to 0.868, accounting for approximately 59.1 % of the performance loss during the crossing period. Moreover, the resilience metric (Re) is calculated as 0.764, indicating a high level of resilience for the existing metro tunnel in this case. In addition, other performance indexes based on tunnel longitudinal settlement are discussed, demonstrating the good rationality and applicability of the proposed index.

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来源期刊
Transportation Geotechnics
Transportation Geotechnics Social Sciences-Transportation
CiteScore
8.10
自引率
11.30%
发文量
194
审稿时长
51 days
期刊介绍: Transportation Geotechnics is a journal dedicated to publishing high-quality, theoretical, and applied papers that cover all facets of geotechnics for transportation infrastructure such as roads, highways, railways, underground railways, airfields, and waterways. The journal places a special emphasis on case studies that present original work relevant to the sustainable construction of transportation infrastructure. The scope of topics it addresses includes the geotechnical properties of geomaterials for sustainable and rational design and construction, the behavior of compacted and stabilized geomaterials, the use of geosynthetics and reinforcement in constructed layers and interlayers, ground improvement and slope stability for transportation infrastructures, compaction technology and management, maintenance technology, the impact of climate, embankments for highways and high-speed trains, transition zones, dredging, underwater geotechnics for infrastructure purposes, and the modeling of multi-layered structures and supporting ground under dynamic and repeated loads.
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