超大直径盾构隧道在采用机械方法建造穿越通道时的失稳机理和分段加固措施

IF 6.7 1区 工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY Tunnelling and Underground Space Technology Pub Date : 2024-10-10 DOI:10.1016/j.tust.2024.106125
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引用次数: 0

摘要

用机械方法建造横向通道是一种新兴的施工技术,具有诸多优点。然而,超大直径(ULD)盾构隧道的分段掘进会带来巨大的安全风险,而且横向开口结构的失稳机理尚不清楚。基于中国首个采用机械法建造横向通道的超大直径盾构隧道项目,利用 ABAQUS 建立了精细的三维有限元模型。模型考虑了材料和几何非线性因素,用于综合分析施工扰动响应、分段失稳机理和加固措施。研究结果表明:(1)交叉通道的机械施工会导致结构收敛变形增加 24.84% 至 58.57%,并出现明显的应力集中;(2)开口形成后,C 形环和半剖环在力和变形方面的表现不再一致。此外,分段衬砌在局部附加荷载作用下的失稳特性也发生了显著变化,导致失稳起始荷载降低了 30%;(3)采用钢环梁(SRG)加固措施后,开口结构的失稳过程与初始结构类似。机械施工造成的失稳起始荷载损失减少了 34.4% ∼ 84.4%。然而,将 SRG 厚度增加到 40 毫米以上对加固效果的影响有限。这项研究为类似工程项目提供了理论和实践启示,对项目安全起到了积极作用。
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Instability mechanism and reinforcement measures for segments of Ultra-Large diameter shield tunnels when constructing cross passages by mechanical methods
Construction of cross passages by mechanical methods represents an emerging construction technique with numerous advantages. However, cutting through segments of ultra-large diameter (ULD) shield tunnels poses significant safety risks, and the instability mechanism of those structures with lateral openings remains unclear. Based on China’s first ULD shield tunnel project that adopted the mechanical method for construction of cross passages, refined three-dimensional finite element models were created with ABAQUS. The models considered material and geometric non-linearity and were employed for comprehensive analyses of construction disturbance responses, instability mechanisms of segments, and reinforcement measures. The findings reveal that (1) mechanical construction of cross passages leads to a 24.84 % to 58.57 % increase in structural convergence deformation and a significant stress concentration; (2) The C-shaped ring and the semi-split rings no longer behave consistently in terms of force and deformation after the opening is formed. Additionally, there are significant shifts in the instability characteristics under localized surcharge loads of the segmental lining, resulting in a 30 % decrease in instability start load; (3) After adopting the reinforcement measure of steel ring girders (SRG), the instability process of the structure with opening is similar to that of the initial structure. The loss in instability start load, caused by mechanical construction, has been reduced by 34.4 % ∼ 84.4 %. However, increasing SRG thickness beyond 40 mm has a limited impact on reinforcement efficacy. This study offers theoretical and practical insights for similar engineering projects, positively contributing to project safety.
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来源期刊
Tunnelling and Underground Space Technology
Tunnelling and Underground Space Technology 工程技术-工程:土木
CiteScore
11.90
自引率
18.80%
发文量
454
审稿时长
10.8 months
期刊介绍: Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.
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