Tunnelling and Underground Space Technology最新文献_第2页

Experimental investigation on the fire performance of novel multi-scale fiber reinforced UHPC segments 新型多尺度纤维增强UHPC管片防火性能试验研究

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology

Pub Date : 2026-05-01 Epub Date: 2026-01-02 DOI: 10.1016/j.tust.2025.107417

Yao Zhang , Ruanxiang Xiong , Panpan Cheng , Yibo Chen , Weigang Zhao , Kaihang Han , Xi Jiang , Hehua Zhu , Zhiguo Yan

The limitations of conventional reinforced concrete (RC) lining segments in complex geological and fire-prone environments have driven the demand for more durable and fire-resilient materials in shield tunnel construction. Ultra-high-performance concrete (UHPC) offers outstanding strength and durability but is vulnerable to explosive spalling and rapid strength degradation at elevated temperatures. This study develops a multi-scale fiber-reinforced ultra-high-performance concrete (MSFUHPC) incorporating steel, polyethylene, and carbon fibers, together with fly ash cenospheres (CE), aiming to enhance thermal stability, suppress spalling, and reduce thermal degradation through their synergistic effects. Comparative experiments investigate the spalling behavior and mechanical performance of MSFUHPC segments with and without rebars, under both ambient conditions and hydrocarbon (HC) fire conditions. Results show that MSFUHPC segments exhibit superior fire resistance, reduced spalling depth, and improved load-bearing capacity compared with conventional concrete. CE-containing segments exhibit a maximum spalling depth of only around 5 mm and retain up to 2.9 times the post-fire load-bearing capacity of RC linings. Rebars further mitigate spalling and enhance post-fire ductility by improving heat dissipation and stress redistribution, and their partial strength recovery after cooling contributes to residual capacity retention. Overall, MSFUHPC demonstrates excellent mechanical stability, spalling resistance, and post-fire recovery, offering a practical and fire-resilient material solution for next-generation shield tunnel linings.

传统钢筋混凝土（RC）衬砌管片在复杂地质和火灾易发环境中的局限性，推动了盾构隧道施工对更耐用和耐火材料的需求。超高性能混凝土（UHPC）具有出色的强度和耐久性，但在高温下容易发生爆炸性剥落和强度迅速退化。本研究开发了一种多尺度纤维增强高性能混凝土（MSFUHPC），该混凝土将钢、聚乙烯和碳纤维与粉煤灰微球（CE）结合在一起，旨在通过它们的协同作用增强热稳定性，抑制剥落，减少热降解。对比实验研究了在环境条件和碳氢化合物（HC）火灾条件下，带钢筋和不带钢筋的MSFUHPC管段的剥落行为和力学性能。结果表明，与常规混凝土相比，MSFUHPC段具有更好的耐火性能，减少了剥落深度，提高了承载能力。含ce段的最大剥落深度仅为5毫米左右，其火灾后承载能力是RC衬里的2.9倍。钢筋通过改善散热和应力再分配，进一步减轻剥落，提高火灾后的延性，冷却后的部分强度恢复有助于保留剩余容量。总体而言，MSFUHPC具有优异的机械稳定性、抗剥皮性和火灾后恢复能力，为下一代盾构隧道衬砌提供了实用的耐火材料解决方案。

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引用次数: 0

Numerical investigation on the upstream–downstream thermal interactions during sequential artificial ground freezing (SAGF) of metro twin tunnels in high-seepage ground 高渗地下地铁双隧道序贯人工冻结过程上下游热相互作用数值研究

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology

Pub Date : 2026-05-01 Epub Date: 2026-01-27 DOI: 10.1016/j.tust.2026.107484

Kangjian Zhang , Zhiqiang Zhang , Zhan Zhang

Sequential artificial ground freezing (SAGF) provides improved frost heave control in urban tunnel engineering; however, its performance is challenged in high-seepage ground due to complex thermo-hydraulic interactions between the upstream and downstream freezing zones, where groundwater flow disrupts thermal symmetry and compromises curtain closure. This study focuses on the novel upstream–downstream interactions induced by sequential freezing under groundwater flow. A coupled thermo-hydraulic numerical model is developed to investigate the upstream–downstream effect during SAGF under various seepage velocities. The evolution of the temperature field, closure behavior, average temperature, and effective thickness of the frozen curtain is systematically analyzed. The results show that seepage velocities below 10 m/d cause asymmetric cooling that disrupts overall closure, whereas velocities exceeding 10 m/d lead to significant downstream cold energy transport, delayed closure, and potential non-closure of the frozen curtain. The closure time of the upstream freezing curtain increases exponentially when the seepage velocity exceeds a critical threshold of 7 m/d. In contrast, the closure time of downstream freezing exhibits a nonmonotonic response to seepage velocity, governed by the net cold energy balance. The frozen curtain develops pronounced asymmetry, with its consistently weakest zone located at approximately 225° relative to the tunnel center. These findings reveal the dominant mechanism of upstream–downstream thermal interaction under seepage conditions and provide quantitative design guidance for SAGF in high-seepage environments, highlighting the necessity of seepage-adaptive strategies in future engineering practice.

序贯人工冻结技术为城市隧道工程冻胀控制提供了有效手段。然而，由于上游和下游冻结区之间复杂的热水力相互作用，其性能在高渗地层中受到挑战，地下水流动破坏了热对称性并影响了帷幕的闭合。本文主要研究地下水流动下序贯冻结引起的新型上下游相互作用。建立了热-水耦合数值模型，研究了不同渗流速度下SAGF的上下游效应。系统地分析了冻结帷幕的温度场、闭合特性、平均温度和有效厚度的演变过程。结果表明，低于10 m/d的渗流速度会导致不对称冷却，破坏整体闭合，而超过10 m/d的渗流速度会导致大量的下游冷能传输，延迟闭合，甚至可能导致冻结幕不闭合。当渗流速度超过临界阈值7 m/d时，上游冻结幕的关闭时间呈指数增长。下游冻结闭合时间对渗流速度呈非单调响应，受净冷能平衡支配。冻结帷幕形成明显的不对称性，其最弱的区域始终位于相对于隧道中心约225°的位置。这些发现揭示了渗流条件下上下游热相互作用的主导机制，为高渗流环境下SAGF的定量化设计提供了指导，突出了渗流自适应策略在未来工程实践中的必要性。

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引用次数: 0

TTM: A concise yet effective surface reconstruction approach for tunnel point cloud from mobile mapping system TTM：一种基于移动测绘系统的隧道点云地表重建方法

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology

Pub Date : 2026-05-01 Epub Date: 2026-01-03 DOI: 10.1016/j.tust.2025.107411

Hao Cui , Jian Li , Qingwu Hu , Long He , Yiwen Tao , Lei Xu , Qingzhou Mao

Tunnels are critical infrastructure, the surface reconstruction of their point cloud is essential for applications such as reality capture BIM and digital twin systems. While mobile mapping systems (MMS) represent an efficient approach for acquiring tunnel point clouds, existing surface reconstruction methods suffer from low efficiency and poor geometric fidelity in tunnel environments. This paper proposes TTM (topology transfer meshing), a concise yet efficient surface reconstruction method for MMS-acquired tunnel point clouds. The approach employs an occlusion-free projection to map 3D point clouds onto a 2D plane, constructs a 2D Delaunay triangulation, and subsequently transfers the mesh topology back to 3D space through a topology transfer mechanism. Qualitative and quantitative experiments conducted on point cloud datasets totaling over 6 km of subway, high-speed rail, and highway tunnels, comprising more than 1 billion points, demonstrate that our method outperforms both conventional and deep learning-based surface reconstruction approaches in both computational efficiency and geometric fidelity. Additional experiments confirm the method’s robust meshing capability with decimated point clouds while revealing heightened sensitivity to point clouds containing substantial measurement errors. Beyond tunnel engineering, this technique extends to digital modeling of linear infrastructure, including pipelines and utility tunnels, providing efficient technical support for intelligent operation and maintenance.

隧道是关键的基础设施，其点云的表面重建对于现实捕获BIM和数字孪生系统等应用至关重要。虽然移动测绘系统（MMS）是一种获取隧道点云的有效方法，但现有的表面重建方法在隧道环境中存在效率低和几何保真度差的问题。本文提出了一种简洁而高效的mms获取隧道点云表面重建方法TTM（拓扑转移网格）。该方法采用无遮挡投影将三维点云映射到二维平面上，构建二维Delaunay三角剖分，随后通过拓扑转移机制将网格拓扑转移回三维空间。在总计超过6公里的地铁、高速铁路和公路隧道的点云数据集上进行的定性和定量实验表明，我们的方法在计算效率和几何保真度方面优于传统和基于深度学习的表面重建方法。额外的实验证实了该方法对大量点云的鲁棒网格划分能力，同时揭示了对包含大量测量误差的点云的更高灵敏度。除了隧道工程，该技术还扩展到线性基础设施的数字建模，包括管道和公用隧道，为智能运维提供有效的技术支持。

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引用次数: 0

An integrated in-situ evaluation grouting method based on multi-parameter fusion of probe drilling, water pressure tests, and horizontal cross-hole resistivity tomography 基于探针钻孔、水压试验和水平井间电阻率层析成像多参数融合的原位综合评价注浆方法

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology

Pub Date : 2026-05-01 Epub Date: 2026-01-21 DOI: 10.1016/j.tust.2026.107480

Lichao Nie , Pengyu Jing , Shixun Jia , Zhi-Qiang Li , Shimin Li

Fractured, water-bearing rock ahead of tunnel faces is a principal cause of water and mud inrush. Quantifying the in-situ performance of pre-excavation grouting remains challenging because the process is not directly observable. This study proposes a multi-parameter fusion framework that integrates probe drilling, water pressure tests, and horizontal cross-hole resistivity tomography for evaluating tunnel grouting in-situ. Four normalized indicators—average resistivity (R), water inflow (V), rock-mass integrity (W), and water permeability (K)—are combined using a convex-combination weighting of AHP and entropy weights and a second-order Choquet integral to obtain the interpretable, segment-level grouting-effectiveness index, which ranged from 0.6624 to 0.7577 after grouting. The fusion captures interactions among indicators while preserving physical interpretability. This evaluation method also coordinates and validates the qualitative observations of various exploration techniques before and after grouting with the quantitative analysis results, enabling a more detailed and convincing evaluation of grouting effectiveness. Applied to a complex section of the No. 2 tunnel of Xianglu Mountain in Southwest China, the framework identified post-grouting increases in resistivity and integrity and reductions in water permeability and inflow through field experiments, consistent with post-excavation observations. The results demonstrate a robust, operational approach for in-situ assessment of grouting performance that is transferable to tunnels with similar hydrogeological settings.

隧道工作面前方的裂隙含水岩是造成涌水、涌泥的主要原因。由于预开挖注浆过程不能直接观测，因此对其原位性能进行量化仍然具有挑战性。本研究提出了一种结合探针钻孔、水压试验和水平井间电阻率层析成像的多参数融合框架，用于隧道注浆原位评价。将平均电阻率(R)、涌水量(V)、岩体完整性(W)、渗透率(K) 4个归一化指标，采用AHP和熵权的凸组合加权和二阶Choquet积分相结合的方法，得到了可解释的分段级注浆效果指标，注浆后该指标取值范围为0.6624 ~ 0.7577。这种融合捕获了指标之间的相互作用，同时保留了物理可解释性。该评价方法还将注浆前后各种勘探技术的定性观测结果与定量分析结果进行了协调和验证，使注浆效果评价更加细致和有说服力。将该框架应用于西南相鹿山2号隧道某复杂断面，通过现场试验发现注浆后电阻率和完整性增加，透水性和流入减少，与开挖后观测结果一致。结果证明了一种可靠的、可操作的原位注浆性能评估方法，可应用于具有类似水文地质环境的隧道。

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引用次数: 0

New cutting tool wear testing method for evaluating the influence of foam additive on plowing effect during shield TBM tunnelling in dense sandy gravel ground 评价泡沫添加剂对盾构掘进机在密砂砾石地层中掘进效果影响的刀具磨损试验新方法

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology

Pub Date : 2026-05-01 Epub Date: 2026-01-30 DOI: 10.1016/j.tust.2026.107499

Shao-Hui Tang , Xiao-Ping Zhang , Quan-Sheng Liu , Yu-Cong Pan , Wei-Qiang Xie , Xin-Fang Li , Hao-Jie Wang

When shield TBM tunnelling in abrasive sandy gravel ground, the higher ripper tooth plows the excavation surface, and then the lower scraper cuts the loose sandy gravel. The plowing effect refering to the mitigation of ripper tooth on scraper wear by loosing the dense sandy gravel is related to cutter height difference, inherent soil properties and foam additive parameters. However, the previous studies focus mainly on the former two factors, and the influence mechanisms of foam additives on the plowing effect are unclear. To fulfill the evaluation of plowing effect under various foam additive conditions, the WHU-SAT test apparatus that can continuously change cutter height difference was developed. The plowing coefficient was proposed to quantify the plowing effect of ripper tooth on dense sandy gravel ground. The variations in plowing coefficient, ripper tooth wear and modelled cutterhead torque with foam additive parameters were analyzed under various cutter height difference conditions. The influence mechanisms of solution concentration and injection ratio on plowing effect were revealed based on particle contact analysis. Cutter height difference and foam additive parameters were optimized for abrasive sandy gravel ground tunnelling. The results indicate that under the lubrication of active material on particle surface and the cushion of air bubble on particle contact, the plowing coefficient increases rapidly and then slowly with increasing solution concentration and injection ratio. The ripper tooth wear and modelled cutterhead torque decrease first rapidly and then slowly with increasing solution concentration, while they decrease first and then stabilize with increasing injection ratio. The optimal cutter height difference stabilizes with solution concentration, while it decreases first and then stabilizes with increasing injection ratio. The present study provides a reference for optimizing cutter height difference and foam additive parameters in abrasive sandy gravel ground tunnelling using shield TBM.

盾构掘进机在磨蚀砂砾地层中掘进时，上部的开刀齿刨开开挖面，下部的刮板切割松散的砂砾。通过松散密砂砾石来缓解撕裂齿对刮板磨损的犁削效果与刀高差、固有土性和泡沫添加剂参数有关。然而，以往的研究主要集中在前两个因素上，泡沫添加剂对耕地效果的影响机制尚不清楚。为评价不同泡沫添加剂条件下的耕地效果，研制了可连续改变刀具高度差的WHU-SAT试验装置。提出了用犁耕系数来量化开刀齿在密砂砾石地面上的犁耕效果。分析了不同刀具高度差条件下，泡沫添加剂参数对犁耕系数、撕裂齿磨损和模拟刀盘扭矩的影响。在颗粒接触分析的基础上，揭示了溶液浓度和注入比对犁耕效果的影响机理。对磨料砂砾地面隧道掘进的刀具高度差和泡沫添加剂参数进行了优化。结果表明：在活性物质对颗粒表面的润滑和颗粒接触处气泡的缓冲作用下，随着溶液浓度和注入比的增加，犁耕系数先增大后减慢；随着溶液浓度的增加，撕裂齿磨损和模拟刀盘扭矩先快速减小后缓慢减小，随着注入比的增加，先减小后趋于稳定。最佳切削高度差随溶液浓度的增加而趋于稳定，随注入比的增加先减小后稳定。本研究为盾构机砂砂砾石地面隧道掘进中刀具高度差和泡沫添加剂参数的优化提供了参考。

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引用次数: 0

Data-driven causal factor analysis of metro construction incidents using complex network theory 基于复杂网络理论的地铁施工事故数据驱动原因分析

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology

Pub Date : 2026-05-01 Epub Date: 2026-01-16 DOI: 10.1016/j.tust.2026.107464

Pan Zhang , Michael C.P. Sing , Albert P.C. Chan , Shengyu Guo

Near misses and accidents remain two of the most prevalent undesired incidents in metro construction, posing significant threats to safety. While these incidents often share common causal factors, the large number of factors involved in these incidents and the intricate relationships among them make it difficult to identify potential hazards and formulate targeted prevention measures. To address this challenge, this study applied complex network theory to systematically examine the interrelationships among causal factors of metro construction incidents. A case study approach was adopted, drawing on more than 4,000 near-miss and accident reports collected from multiple sources, such as government websites and construction sites. Accident chains and near-miss causation-attribute chains were extracted based on a comprehensive list of causal factors and work attributes (i.e., construction phase, construction area, and worker type). They were then used to construct a two-layer Metro Construction Incident Network (MCIN), capturing the multifaceted interactions between factors. Robustness assessment indicated that strength-based attack was one of the most effective strategies for incident prevention. Also, network topology analysis identified critical causal factors of accidents and near misses and revealed their occurrence patterns across different work attributes. Integrating work attributes into analysis provides greater flexibility for developing targeted prevention strategies for safety risks that are prone to incidents. The findings offer both theoretical insight for advancing accident causation analysis and practical guidance for improving safety risk management in metro construction.

未遂事故和意外事故仍然是地铁建设中最常见的两种不希望发生的事故，对安全构成重大威胁。虽然这些事件往往具有共同的因果因素，但这些事件涉及的因素众多，并且它们之间的关系错综复杂，因此很难识别潜在的危害并制定有针对性的预防措施。为了应对这一挑战，本研究运用复杂网络理论系统地考察了地铁施工事故成因之间的相互关系。采用个案研究方法，从多个来源（如政府网站和建筑工地）收集了4,000多份未遂事故和事故报告。基于原因因素和工作属性（即施工阶段、施工区域和工人类型）的综合列表，提取事故链和未遂事故因果属性链。然后，他们被用来构建一个双层地铁建设事件网络（MCIN），捕捉因素之间的多方面相互作用。鲁棒性评估表明，基于强度的攻击是最有效的事件预防策略之一。此外，网络拓扑分析确定了事故和未遂事故的关键原因因素，并揭示了它们在不同工作属性中的发生模式。将工作属性集成到分析中，为针对容易发生事故的安全风险制定有针对性的预防策略提供了更大的灵活性。研究结果既为推进事故成因分析提供了理论依据，也为加强地铁建设安全风险管理提供了实践指导。

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引用次数: 0

A numerical study of damage evolution and crack propagation in backfill bodies of high-temperature thermal energy storage cavities in mines 矿山高温储热腔充填体损伤演化与裂纹扩展数值研究

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology

Pub Date : 2026-05-01 Epub Date: 2026-01-04 DOI: 10.1016/j.tust.2025.107362

Rui Zhan, Bo Zhang, Lang Liu, Chao Huan, Huisheng Qu, Huicong Xu, Jin Zhang, Hongjun Xi

The utilization of goafs for building high-temperature thermal energy storage cavities is an effective approach to large-scale solar thermal energy storage. However, its long-term stability is constrained by the damage evolution and crack propagation of the backfill body under thermo-mechanical coupling effects. To address this, this study establishes a thermo-mechanical-damage coupled model based on elastic damage theory to describe the damage behavior of the backfill body under thermal expansion effects. Damage evolution is jointly governed by the maximum tensile stress criterion and the Drucker-Prager criterion. The model’s accuracy is validated through numerical simulations, high-temperature uniaxial compression tests on backfill bodies, and comparisons with analytical solutions. Based on this model, the crack propagation and damage evolution patterns during long-term operation of the thermal energy storage cavity are investigated. Results indicate that the circular thermal energy storage cavity, due to its axisymmetric structure, facilitates a uniform distribution of thermal stresses. Radial thermal expansion is converted into uniform circumferential stresses, thereby reducing local stress concentrations. Storage temperature is a key factor controlling backfill body damage. The damage growth rate reaches as much as 56.8 % in the high-temperature range of 400 °C to 450 °C, significantly higher than the 16.8 % growth rate observed between 300 °C and 350 °C. Under low vertical stress conditions, damage zones in the backfill body remain controllable without crack propagation. Conversely, high vertical stress induces coupling between stress concentration and the thermal softening effect, leading to tensile damage at the top and bottom of the thermal energy storage cavity and ultimately resulting in crack formation. Furthermore, maintaining a spacing between adjacent thermal energy storage cavities on the same level that exceeds 1.5 times the cavity diameter effectively mitigates the risk of overall instability caused by the interconnection of damage zones. This study provides theoretical foundations and technical references for the safe design of high-temperature thermal energy storage cavities in mine goaf areas.

利用采空区建造高温储热腔是实现大规模太阳能蓄热的有效途径。但其长期稳定性受到充填体在热-力耦合作用下的损伤演化和裂纹扩展的制约。为此，本研究基于弹性损伤理论建立了热膨胀作用下充填体的热-机-损伤耦合模型来描述充填体的损伤行为。损伤演化受最大拉应力准则和Drucker-Prager准则共同支配。通过数值模拟、回填体高温单轴压缩试验以及与解析解的比较，验证了模型的准确性。基于该模型，研究了蓄热腔在长期运行过程中的裂纹扩展和损伤演化模式。结果表明，圆形储热腔由于其轴对称结构，有利于热应力的均匀分布。径向热膨胀转化为均匀的周向应力，从而减少了局部应力集中。贮存温度是控制充填体损伤的关键因素。在400 ~ 450℃的高温范围内，损伤增长率高达56.8%，显著高于300 ~ 350℃的16.8%。在低竖向应力条件下，充填体内部损伤区域保持可控，不发生裂纹扩展。反之，高垂直应力会引起应力集中与热软化效应耦合，导致储热腔顶部和底部出现拉伸损伤，最终形成裂纹。此外，保持相邻储热腔之间在同一水平上的间距超过1.5倍的腔径，有效地减轻了由于损伤区互连而导致的整体不稳定的风险。本研究为矿山采空区高温储热空腔的安全设计提供了理论依据和技术参考。

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引用次数: 0

Mechanical response characteristics and influencing factors analysis of non-parallel complex subway station-tunnel groups close proximity construction 非平行复杂地铁车站-隧道群近距离施工的力学响应特性及影响因素分析

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology

Pub Date : 2026-05-01 Epub Date: 2026-01-21 DOI: 10.1016/j.tust.2026.107472

Xinrong Liu , Lei Fang , Xiaohan Zhou , Qiang Xu , Kun Cheng

The mechanical response characteristics of the adjacent structures involving non-parallel complex subway tunnels significantly affect the stability of tunnel structures and ground settlement. To analyze the mechanical stability of both the main and auxiliary tunnels in the vicinity of the subway station, an integrated methodological framework that combines physical model testing with advanced numerical simulation techniques was adopted to precisely identify the deformation characteristics of adjacent non-parallel main and auxiliary tunnels. In addition, the study systematically investigated the influence mechanisms associated with construction sequence, construction methods, and excavation step spacing on the mechanical behavior of the tunnel structures and the stability of stratum. The results indicate that the disturbance-induced settlement of the main tunnel crown gradually decreases as adjacent non-parallel auxiliary tunnels are excavated upward. Meanwhile, as the vertical elevation difference between the main and auxiliary tunnels increases, the principal stress borne by the main tunnel lining is gradually transferred toward the lining of the auxiliary tunnel. Excavation of Auxiliary Tunnel No. 6 and the wind pavilion trigger sudden mutual deformation and abrupt stress release in the intervening rock mass; therefore, particular attention should be paid to its stability and reinforcement. The deformation of the tunnel group and the ventilation shaft structure mainly occurs during the excavation process. Construction method and step length significantly affect vault deformation and surface settlement of the tunnel group, whereas construction sequence mainly impacts stress disturbance among individual tunnels.

非平行复杂地铁隧道相邻结构的力学响应特性对隧道结构的稳定性和地面沉降有重要影响。为分析地铁车站附近主副隧道的力学稳定性，采用物理模型试验与先进数值模拟技术相结合的综合方法框架，精确识别相邻非平行主副隧道的变形特征。此外，系统探讨了施工顺序、施工方式、开挖步距对隧道结构力学性能和地层稳定性的影响机制。结果表明，随着相邻非平行副隧道的向上开挖，主隧道顶板的扰动沉降逐渐减小；同时，随着主、副隧道竖向标高差的增大，主隧道衬砌承受的主应力逐渐向副隧道衬砌转移。6号辅助隧道与风亭的开挖引起中间岩体突然相互变形和应力突然释放；因此，应特别注意其稳定性和加固。隧道群和通风竖井结构的变形主要发生在开挖过程中。施工方法和步长对隧道群拱顶变形和地表沉降有显著影响，而施工顺序主要影响单个隧道间的应力扰动。

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引用次数: 0

Unified nonlinear modelling of longitudinal equivalent bending stiffness for circular and non-circular shield tunnels 圆形和非圆形盾构隧道纵向等效弯曲刚度的统一非线性建模

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology

Pub Date : 2026-05-01 Epub Date: 2026-01-28 DOI: 10.1016/j.tust.2026.107485

Xumin Huang , Linchong Huang , Yu Liang , Yanli Zhang , Zuxian Wang , Yuyong Jiao , Wengang Zhang

The longitudinal equivalent bending stiffness (LEBS) governs the deformation behavior of shield tunnels. Conventional methods for determining LEBS, however, are restricted in both universality and computational efficiency by their dependence on specific geometric equations of the tunnel cross-section for internal force integration. Through discretization and numerical integration, this paper introduces a unified circumferential joint fiber section model (U-CJFM) to evaluate the nonlinear LEBS of a tunnel with arbitrary cross-sections, enabling the identification of joint bending modes via the relative positions of the neutral and yield axes. Validation against experimental and analytical results for tunnels with circular, quasi-rectangular (QR), and double-O-tube (DOT) cross-sections confirms the accuracy of U-CJFM, with computational efficiency improved by factors of 11.5, 8.1, and 5.7, respectively. Parametric analysis demonstrates the model’s ability to uniformly characterize the nonlinear bending evolution of the tunnel joint under different interface states. When the influence range factor of the circumferential joint (λ) is within the internal [0,1], the longitudinal equivalent bending stiffness efficiency (η) decreases significantly with the increase of λ. When λ exceeds 1, η remains stable while the neutral axis shifts downward. With the increase of the height-width ratio of tunnel cross-sections, the stiffness efficiency η and the compression area of the joint increase, especially under partial contact conditions. Post-yield constitutive behavior of the joint bolt is decisive for stiffness efficiency η, as it declines sequentially with hardening, ideal, and softening constitutive models. Under the identical functional requirements, the quasi-rectangular section demonstrates superior space utilization, and the circular section exhibits optimal bending resistance. This work provides a theoretical basis for predicting the nonlinear longitudinal responses and assessing the safety of shield tunnels with diverse cross-sections.

纵向等效抗弯刚度（LEBS）控制着盾构隧道的变形行为。然而，传统的确定LEBS的方法在通用性和计算效率上都受到限制，因为它们依赖于隧道截面的特定几何方程来进行内力积分。通过离散化和数值积分，提出了一种统一的周向节点纤维截面模型（U-CJFM）来评估任意截面隧道的非线性LEBS，通过中立轴和屈服轴的相对位置来识别节点的弯曲模式。对圆形、准矩形（QR）和双o形管（DOT）断面隧道的实验和分析结果验证了U-CJFM的准确性，计算效率分别提高了11.5、8.1和5.7倍。参数分析表明，该模型能较好地表征不同界面状态下隧道节理的非线性弯曲演化。当周向节点影响范围因子λ在内[0,1]范围内时，纵向等效抗弯刚度效率η随λ的增大而显著降低。当λ大于1时，η保持稳定，中性轴向下移动。随着隧道断面高宽比的增大，节理的刚度效率η和压缩面积增大，特别是在部分接触条件下。结合螺栓屈服后的本构行为对刚度效率η起决定性作用，因为它在硬化、理想和软化本构模型中依次下降。在相同的功能要求下，准矩形截面具有较好的空间利用率，圆形截面具有较好的抗弯性能。为不同断面盾构隧道的非线性纵向响应预测和安全性评估提供了理论依据。

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引用次数: 0

Physics-based digital twin system for artificial ground freezing: implementation in Bangkok tunnel rehabilitation 基于物理的人工冻土数字孪生系统：在曼谷隧道修复中的实施

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology

Pub Date : 2026-05-01 Epub Date: 2026-02-01 DOI: 10.1016/j.tust.2026.107469

Jie Zhou , Chengjun Liu , Chao Ban , Zhenming Shi , Hsinming Shang , Huade Zhou , Zeyao Li

This study presents the inaugural implementation of a physics-based digital twin (DT) system for artificial ground freezing (AGF) construction, demonstrated through Bangkok’s pioneering tunnel rehabilitation project. The work is situated within the broader challenge of urban underground infrastructure under complex geological and environmental constraints, which increasingly demands high-precision and adaptive technologies. This project faces severe challenges due to complex and uneven strata, extremely high ground temperatures, and strict requirements for disturbance control of adjacent structures, making it difficult to rely solely on traditional numerical simulations. The developed physics-data integrated DT system addresses these limitations by synergizing finite element modeling with real-time data assimilation, establishing a dynamically optimized virtual representation of the freezing process. Through calibrated initial parameters from comprehensive in-situ sampling and laboratory tests, coupled with custom-developed bidirectional data interfaces, the system achieves accurate full-field predictions (MAE <0.6 °C) while maintaining computational efficiency. The successful field deployment validates the framework’s capability to enhance decision-making accuracy, optimize freezing parameters operationally, and mitigate risks in complex urban geotechnical environments, marking a significant advancement for sustainable underground infrastructure repair.

本研究介绍了用于人工冻结（AGF）施工的基于物理的数字孪生（DT）系统的首次实施，并通过曼谷开创性的隧道修复项目进行了演示。这项工作位于复杂地质和环境约束下的城市地下基础设施的更广泛挑战中，这越来越需要高精度和自适应技术。该项目地层复杂不均匀，地温极高，对相邻结构扰动控制要求严格，仅依靠传统的数值模拟难以实现，面临严峻挑战。开发的物理数据集成DT系统通过将有限元建模与实时数据同化相结合，建立了冻结过程的动态优化虚拟表示，解决了这些限制。通过校准综合现场采样和实验室测试的初始参数，再加上定制开发的双向数据接口，系统可以在保持计算效率的同时实现准确的全场预测（MAE <0.6°C）。成功的现场部署验证了该框架在提高决策准确性、优化操作冻结参数和降低复杂城市岩土环境风险方面的能力，标志着可持续地下基础设施修复的重大进步。

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引用次数: 0