Tunnelling and Underground Space Technology最新文献_第8页

A “Proactive-Prevention and Post-Resistant” support method for alleviating rockburst in deep-buried large-section tunnels 缓解深埋大断面隧道岩爆的“先防后抗”支护方法

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: 2026-01-06 DOI: 10.1016/j.tust.2025.107402

Fengqiang Gong , Zhixuan Zhang , Bo Wang , Jinhao Dai , Pengyu Ma

Rockburst persistently challenge the safe construction of large-section hard rock tunnels under high geostress environments. At present, the insufficient adaptability of conventional active support strategy which is “Excavate First and Then Support” (EFTS) has limitations in the prevention of the dynamic damage of rockburst. To address the limitations of rockburst prevention, this study proposes a “Proactive-Prevention and Post-Resistant” support (PPS) method for dynamic stability control, which consists of two consecutive steps. First, an initial tunnel with reduced diameter is excavated, followed by installation of pre-stressed rockbolt beyond the designed profile to establish an advanced pressure arch. Subsequently, the tunnel is expanded to the designed cross-section with supplementary reinforcement measures. This new strategy collaboratively combines the stress redistribution effect caused by the initial tunnel geometry, thereby alleviating the degradation of surrounding rock strength caused by excavation and improving the stability of the rock mass. In addition, this strategy takes advantage of the energy absorption capacity of pre-stressed anchor rods, effectively suppressing the risks associated with instantaneous energy release. A case study was conducted on the diversion tunnel No.3 of the Jinping II hydropower station. The evolution of advanced pressure arch boundaries under varying initial tunnel diameters was systematically investigated, as well as the effectiveness of the PPS method. Validation results demonstrate that compared to EFTS support strategy, the PPS method significantly reduces rockburst intensity from widespread moderate to severe rockburst to none or minor rockburst. Mechanistic analysis confirms that this strategy effectively minimizes tangential stress concentration by optimizing pressure arch geometry while enhancing energy dissipation efficiency. The PPSmethod provides a new perspective and methodology for rockburst mitigation in deep large-section hard rock tunnels.

在高地应力环境下，冲击地压对大断面硬岩隧道的安全施工提出了严峻的挑战。目前，传统的主动支护策略“先挖后支护”（EFTS）适应性不足，在防治岩爆动力损伤方面存在一定的局限性。针对岩爆防治的局限性，提出了一种由两个连续步骤组成的“前防后抗”支护（PPS）动态稳定控制方法。首先，挖掘直径减小的初始隧道，然后在设计剖面之外安装预应力锚杆以建立先进的压力拱。随后，通过补充加固措施将隧道扩展至设计截面。这种新策略协同结合了隧道初始几何形状引起的应力重分布效应，从而缓解了开挖引起的围岩强度退化，提高了岩体稳定性。此外，该策略利用了预应力锚杆的吸能能力，有效地抑制了瞬时能量释放带来的风险。系统研究了不同初始隧洞直径条件下超前压力拱边界的演化规律，并验证了PPS方法的有效性。验证结果表明，与EFTS支护策略相比，PPS方法显著降低了岩爆强度，从普遍的中度至重度岩爆到无岩爆或轻度岩爆。力学分析证实，该策略通过优化压拱几何形状，有效降低切向应力集中，同时提高能量耗散效率。该方法为深埋大断面硬岩巷道岩爆防治提供了新的视角和方法。

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引用次数: 0

Predicting disc cutter forces for hard rock TBM cutterhead modeling: a comparative analysis of modified CSM semi-theoretical model and hybrid deep learning approach 硬岩TBM刀盘建模中刀盘力预测：改进CSM半理论模型与混合深度学习方法的比较分析

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: 2026-01-10 DOI: 10.1016/j.tust.2026.107448

Mohammad Matin Rouhani , Jamal Rostami

Prediction of the cutting forces acting on disc cutters is essential for accurate modeling and performance assessment of hard rock tunnel boring machines (TBM). This study investigates two methodologies to enhance the quality of force prediction: the modification of the Colorado School of Mines (CSM) model and the application of advanced machine learning algorithms. The modified CSM model presents rock-type-specific formulas for sedimentary, metamorphic, and igneous rocks, utilizing dimensionless parameters including the Lame brittleness index, internal friction angle, and wave velocity ratio. Three state-of-the-art machine learning architectures, including SAINT (Self-Attention and Intersample Attention Transformer), TabNet, and TabM, are tested with hyperparameter optimization carried out using the Geometric Mean Optimization and Reptile Search Optimization algorithms. The modified CSM model shows statistically significant improvement compared to the original CSM model for all rock groups (p < 0.001), with the most notable enhancement for igneous rocks. Among the machine learning models, GMO-SAINT achieved the highest accuracy for normal force prediction (R² = 0.98 for training and 0.96 for testing), while RSO-TabNet performs best for rolling force prediction (R² = 0.94 for testing). SHAP analysis shows that tip width and cutting depth are the two primary factors that affect normal and rolling forces, respectively, while UCS consistently emerges as a secondary factor with all models. Overall, this combined methodology offers a more reliable cutting force estimation for improving TBM performance prediction.

盘式铣刀切削力的预测对于硬岩隧道掘进机的准确建模和性能评估至关重要。本研究探讨了两种提高力预测质量的方法：修改科罗拉多矿业学院（CSM）模型和应用先进的机器学习算法。修正后的CSM模型利用Lame脆性指数、内摩擦角和波速比等无量纲参数，给出了沉积岩、变质岩和火成岩的岩石类型专用公式。三种最先进的机器学习架构，包括SAINT （Self-Attention and Intersample Attention Transformer）、TabNet和TabM，使用几何平均优化和爬行动物搜索优化算法进行超参数优化测试。与原始CSM模型相比，改进后的CSM模型在所有岩石组中都有统计学上显著的改进（p < 0.001），其中火成岩的改进最为显著。在机器学习模型中，GMO-SAINT法向力预测准确率最高（训练R2 = 0.98，测试R2 = 0.96）， RSO-TabNet滚动力预测准确率最高（测试R2 = 0.94）。SHAP分析表明，刀尖宽度和切削深度分别是影响法向力和轧制力的两个主要因素，而UCS始终是所有模型的次要因素。总的来说，这种组合方法为改进TBM性能预测提供了更可靠的切削力估计。

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引用次数: 0

Influence of disturbance frequency on rockburst in circular openings: insights from cyclic loading experiments 扰动频率对圆孔岩爆的影响：来自循环加载试验的见解

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.2026.107497

Yang Wang , Murat Karakus , Manchao He , Dongqiao Liu

Rockbursts induced by cyclic loading are a major hazard in deep underground excavations. Among the influencing factors, the cyclic loading frequency (f_c), typically generated by blasting or mechanical excavation, plays a critical role in controlling the initiation and progression of rockbursts. In this study, true triaxial rockburst experiments were conducted on sandstone specimens containing a circular opening to investigate the frequency-dependent failure characteristics. Four values of f_c (0.25, 0.5, 0.75, and 1 Hz) were applied, and the failure processes were monitored using real-time video recording and acoustic emission (AE) techniques. The evolution of energy release, velocity fields, and AE spatial distribution was quantitatively analyzed. Post-failure fragments were further examined using scanning electron microscopy (SEM) to assess internal damage. The results indicate that although the total input energy remained nearly constant, higher f_c significantly increased the energy release rate and fragment ejection velocity. SEM observations reveal that increasing f_c leads to a higher pore density and more pronounced pore connectivity. Image-based porosity analysis shows a clear increasing trend, reflecting progressive internal degradation. The development and accumulation of these pores accelerate strength deterioration, which promotes the earlier intersection of the Mohr stress circle with the weakened Mohr–Coulomb failure envelope, thereby advancing failure onset . The results demonstrate the critical role of disturbance frequency in rockburst triggering, enabling more effective control of excavation disturbances in underground construction.

循环荷载引起的岩爆是深埋地下工程的主要灾害之一。在影响因素中，爆破或机械开挖产生的循环荷载频率（fc）对岩爆的发生和发展起着关键的控制作用。本文对含圆形开口的砂岩试样进行了真三轴岩爆试验，探讨了其频率相关破坏特征。采用4个fc值（0.25、0.5、0.75和1 Hz），并使用实时视频记录和声发射（AE）技术监测失效过程。定量分析了能量释放、速度场和声发射空间分布的演变过程。失效后的碎片使用扫描电子显微镜（SEM）进一步检查以评估内部损伤。结果表明，虽然总输入能量基本保持不变，但较高的fc显著提高了能量释放速率和破片弹射速度。SEM观察表明，fc的增加导致孔隙密度增大，孔隙连通性更明显。基于图像的孔隙度分析显示出明显的增加趋势，反映了内部的逐步降解。这些孔隙的发育和积累加速了强度的劣化，促进了Mohr应力圈与减弱的Mohr - coulomb破坏包络线的早交，从而提前了破坏的发生。研究结果表明，扰动频率在岩爆触发中起着至关重要的作用，可以更有效地控制地下施工中的开挖扰动。

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引用次数: 0

Prediction of HRR in tunnel fires under different tunnel inclinations and ambient pressure conditions based on recurrent neural networks 基于递归神经网络的不同倾斜度和环境压力条件下隧道火灾HRR预测

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

Tunnelling and Underground Space Technology

Pub Date : 2026-04-01 Epub Date: 2025-12-11 DOI: 10.1016/j.tust.2025.107371

Wei Liu , Tiannan Li , Haoran Li , Han Wu , Lei Deng , Congling Shi

To investigate the influence of tunnel slope on the longitudinal ceiling temperature distribution under low-pressure conditions, and to evaluate the effectiveness of neural network models in predicting fire heat release rates, tunnel models with varying ambient pressures and inclination angles were developed using the FDS. Using the temperature distribution dataset along the tunnel ceiling, three neural network models—RNN, LSTM, and GRU—were trained and evaluated. The results indicated that: (i) At a heat release rate of 5 MW, increasing pressure leads to greater variation and a general decrease in peak ceiling temperature. In contrast, at 10 MW and 15 MW, the variation in peak temperature is smaller, and overall temperature trends increase steadily. (ii) As the slope increases, the peak temperature position shifts progressively downstream, the peak value tends to decrease. (iii) Among the models, the RNN achieved the highest prediction accuracy, with a minimum relative error of 10 % under the current dataset scale. The LSTM and GRU models demonstrated comparable performance, each with a maximum relative error of 20 %. (iiii) Under the present simulation framework, deploying multiple measurement points starting at 25 m downstream yielded the best overall performance, whereas single-point setups exhibited relative errors of up to 15 %. These findings provide a theoretical foundation and technical guidance for tunnel design, fire behavior analysis, and the development of intelligent fire monitoring systems.

为了研究低压条件下隧道坡度对隧道顶板纵向温度分布的影响，并评估神经网络模型预测火灾放热速率的有效性，利用FDS建立了不同环境压力和倾斜角度下的隧道模型。利用隧道顶棚温度分布数据，对rnn、LSTM和gru三种神经网络模型进行了训练和评估。结果表明：(1)在放热速率为5 MW时，压力的增加导致峰值温度变化更大，峰值温度普遍降低。相比之下，在10 MW和15 MW时，峰值温度变化较小，总体温度趋势稳定增加。（ii）随着坡度的增大，峰值温度位置逐渐向下游移动，峰值有减小的趋势。（iii）在所有模型中，RNN的预测精度最高，在当前数据集规模下，相对误差最小为10%。LSTM和GRU模型表现出相当的性能，每个模型的最大相对误差为20%。（iii）在目前的模拟框架下，从下游25米开始部署多个测量点产生了最佳的整体性能，而单点设置显示出高达15%的相对误差。研究结果为隧道设计、火灾行为分析和智能火灾监控系统的开发提供了理论基础和技术指导。

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引用次数: 0

A temperature-dependent nonlinear model for estimation of tunnel roof stability in unsaturated soils 非饱和土中隧道顶板稳定性估计的温度非线性模型

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

Tunnelling and Underground Space Technology

Pub Date : 2026-04-01 Epub Date: 2025-12-22 DOI: 10.1016/j.tust.2025.107388

Changbing Qin , Yunquan Gan , Peng Zeng

Tunnel roof stability is a hot topic in engineering practice and has been investigated through an analytical manner. Nonetheless, less attention has been paid to consider unsaturated soils under non-isothermal conditions. An upper bound analysis procedure with considerations of temperature and unsaturated soil properties is proposed for this specific purpose. The effect of temperature would directly affect the state of soil matric suction, and a temperature-dependent model for characterizing unsaturated soil shear strength is developed. Within the framework of plasticity theory, external work rates and energy dissipation rates are calculated after the establishment of a kinematically admissible failure mechanism. The upper-bound formulations of effective collapse mechanism and its failure dimension are derived by satisfying the equilibrium of external and internal rates of work, by virtue of variational principle. Specific solutions for rectangular and circular tunnels are sought, in terms of velocity detaching surface, factor of safety, collapsing height and width. After having validated the proposed procedure and solutions by numerical modelling and comparing with existing studies, the effects of those potential influential factors on tunnel roof stability are thoroughly investigated, which aids to provide useful reference for tunnel design in practice.

巷道顶板稳定性是工程实践中的热点问题，本文采用分析方法对其进行了研究。然而，非饱和土在非等温条件下的研究较少。为此提出了考虑温度和非饱和土性质的上界分析方法。温度的影响会直接影响土体的吸力状态，建立了非饱和土抗剪强度的温度依赖模型。在塑性理论框架下，建立运动容许破坏机制后，计算外功率和能量耗散率。根据变分原理，在满足内外功平衡的条件下，导出了有效破坏机制的上界表达式及其破坏尺寸。针对矩形和圆形隧道，分别从速度、分离面、安全系数、坍塌高度和坍塌宽度等方面寻求具体的解决方案。通过数值模拟验证了所提出的程序和解决方案，并与已有的研究结果进行了比较，深入探讨了这些潜在影响因素对隧道顶板稳定性的影响，有助于为实际隧道设计提供有益的参考。

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引用次数: 0

Physical modelling of face stability and ground settlement in EPB shield tunnelling incorporating dynamic cutterhead–soil interaction 考虑刀土动力相互作用的盾构掘进工作面稳定与地面沉降物理模拟

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

Tunnelling and Underground Space Technology

Pub Date : 2026-04-01 Epub Date: 2025-12-02 DOI: 10.1016/j.tust.2025.107332

Xuejian Chen , Lv Liu , Shunping Ren , Po Cheng , Manman Liu , Yong Liu , Elton Jian Chen

Tunnel face stability is a critical concern in Earth Pressure Balance (EPB) shield tunnelling, particularly due to the dynamic soil–cutterhead interaction that can induce face failure and ground collapse. Previous studies often overlooked the effect of dynamic excavation process and cutterhead configuration on face stability and ground settlement. This study therefore developed an 1 g model test system that realistically simulates the EPB excavation process, incorporating cutterhead rotation and chamber pressure regulation to investigate tunnel face stability and ground subsidence in sandy soils. The experiments show that the load factor (N_γ) at face failure increases from 0.114 to 0.172 as the cover-to-diameter ratio rises from 1 to 3, and from 0.129 to 0.172 as the cutterhead opening ratio increases from 15 % to 50 %. Additionally, small opening ratios (e.g., 15 %) is found to enhance face stability by providing stronger mechanical support, while larger ratios (e.g., 30 % and 50 %) amplify excavation-induced soil disturbance, diminishing face stability. This dual influence highlights the importance of incorporating dynamic excavation process and cutterhead opening ratio in face stability analysis. Moreover, settlement troughs become wider and deeper with higher opening ratios and shallower cover depths, indicating that within densely populated urban areas or beneath sensitive infrastructures, adopting a low opening ratio (e.g., 15 %) can effectively minimize ground disturbance and mitigate its associated risks to overlying structures, especially for shallowly buried tunnels. Finally, consistency between model predictions and field observations from Chengdu Metro Line 4 confirms the model’s predictive reliability and practical applicability in evaluating face stability. This study provides practical guidance for cutterhead design and support pressure determination in sandy ground tunnelling projects.

在土压平衡（EPB）盾构施工中，工作面稳定性是一个关键问题，特别是由于土-刀盘的动态相互作用可能导致工作面破坏和地面塌陷。以往的研究往往忽略了动态开挖过程和刀盘形态对工作面稳定性和地面沉降的影响。因此，本研究开发了一个1g模型试验系统，真实地模拟了EPB开挖过程，结合刀盘旋转和腔室压力调节来研究沙质土壤中隧道工作面稳定性和地面沉降。试验结果表明，当覆盖直径比从1增加到3时，工作面破坏时的载荷因子（Nγ）从0.114增加到0.172；当刀盘开口比从15%增加到50%时，工作面破坏时的载荷因子（Nγ）从0.129增加到0.172。此外，较小的开孔比（例如15%）通过提供更强的机械支撑来增强工作面稳定性，而较大的开孔比（例如30%和50%）放大了开挖引起的土壤扰动，降低了工作面稳定性。这种双重影响凸显了在工作面稳定性分析中考虑动态开挖过程和刀盘开度比的重要性。此外，沉降槽越宽越深，开孔率越高，覆盖深度越浅，这表明在人口密集的城市地区或敏感基础设施下方，采用低开孔率（例如15%）可以有效地减少地面扰动，并减轻其对上覆结构的相关风险，特别是对于浅埋隧道。最后，模型预测结果与成都地铁4号线现场观测结果的一致性验证了模型预测的可靠性和在评价工作面稳定性方面的实用性。研究结果对砂质地面隧道工程中刀盘的设计和支护压力的确定具有实际指导意义。

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引用次数: 0

Experimental and numerical investigation of shock wave propagation and thermal effects induced by thermobaric explosive detonation in corrugated steel-lined tunnels 波纹钢衬砌隧道中热压炸药爆轰冲击波传播及热效应的实验与数值研究

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

Tunnelling and Underground Space Technology

Pub Date : 2026-04-01 Epub Date: 2025-12-02 DOI: 10.1016/j.tust.2025.107309

Feixiang Chen , Guokai Zhang , Yuxin Wu , Yong He , Zhen Wang , Liwang Liu , Xinli Jiang

The accelerating expansion of underground space utilization has exposed tunnel engineering to escalating hazards from the synergistic effects of shock wave and fireball thermal radiation caused by explosive incidents. The traditional monolithic lining system has been demonstrated to exhibit markedly insufficient energy dissipation capability and disaster mitigation effectiveness. This study establishes a finite volume model (FVM) incorporating afterburning effects to investigate shockwave propagation and fireball thermal effects in corrugated steel-lined tunnels. It is demonstrated that corrugated grooves disrupt shockwave reflection continuity, inducing intermittent reflections and wavefront fragmentation, accelerating energy dissipation and reducing peak overpressure by 27.3 % in tunnels with λ = 150 mm and h = 60 mm versus concrete linings. The attenuation efficiency of shock wave impulse in corrugated steel-lined tunnels decreases monotonically with increasing λ/h ratio. The lower the λ/h ratio, the larger the effective scattering area, causing wavefront fragmentation and multi-path interference, which in turn enhances energy dissipation through wavefront disruption. Additionally, the corrugated structure generates turbulent disturbances and periodic vortex damping effects. These effects causing the expansion of localized high-temperature zones, simultaneously lead to a substantial reduction in fireball volume due to intensified convective heat dissipation and path disruption. In the corrugated steel-lined tunnel with a corrugation wavelength of λ = 150 mm and wave height of h = 70 mm, the maximum propagation distances of fireballs are decreased by 13.1 %. By establishing shockwave prediction models with wall roughness correction, the parameter-dependent energy dissipation mechanisms are quantified, thus providing theoretical foundations and technical support for optimizing tunnel lining design and enhancing underground space protection capabilities.

随着地下空间利用规模的不断扩大，爆炸事故产生的冲击波和火球热辐射的协同效应对隧道工程的危害日益加剧。传统的整体衬砌系统的耗能能力和减灾效果明显不足。本文建立了考虑加力燃烧效应的有限体积模型，研究了波纹钢衬砌隧道中的冲击波传播和火球热效应。结果表明，与混凝土衬砌相比，在λ = 150 mm、h = 60 mm的隧道中，波纹沟槽破坏了冲击波反射的连续性，引起了间歇性反射和波前破碎，加速了能量耗散，峰值超压降低了27.3%。波纹钢衬砌隧道中激波脉冲衰减效率随着λ/h比的增大而单调降低。λ/h比越低，有效散射面积越大，导致波前破碎和多径干扰，从而增强了通过波前破坏的能量耗散。此外，波纹结构还会产生湍流扰动和周期性涡阻尼效应。这些影响导致局部高温区域的扩大，同时由于对流散热加剧和路径中断，导致火球体积大幅减少。在波纹波波长λ = 150 mm、波高h = 70 mm的波纹钢衬砌隧道中，火球的最大传播距离减小了13.1%。通过建立具有壁面粗糙度校正的冲击波预测模型，量化参数相关的能量耗散机制，为优化隧道衬砌设计，提高地下空间防护能力提供理论依据和技术支持。

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引用次数: 0

Effect of early-age loading, formwork removal time, and curing method on the cracking behavior of hydraulic lining concrete structures: Experimental analysis and multi-scale coupling cracking analysis model 早期荷载、拆模时间和养护方式对水工衬砌混凝土结构开裂行为的影响：试验分析和多尺度耦合开裂分析模型

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

Tunnelling and Underground Space Technology

Pub Date : 2026-04-01 Epub Date: 2025-12-03 DOI: 10.1016/j.tust.2025.107337

Pengfei Li , Haoyu Wang , Xuehui An , Duoyin Wang , Ping Mu , Feng Sheng

Beginning at the casting stage, factors such as excessive early-age loading, early removal of the formwork, and unfavorable temperature–humidity conditions can negatively affect the mechanical property evolution of hydraulic lining concrete. Structurally, these factors exacerbate the development of tensile stresses within the lining. When the tensile stress exceeds the tensile strength of the concrete, cracking occurs. To investigate the multi-scale cracking mechanisms in hydraulic lining concrete structures, this study designed a loading apparatus for lining concrete members. Experiments were conducted with early-age loading, formwork removal time, and post-removal environmental temperature and humidity as test variables. The results indicate that early-age loading enhanced the tensile strength of the concrete, delayed cracking time, and increased the cracking load. Advancing the formwork removal time to one day accelerated the development of tensile stresses, causing cracks to propagate throughout the surface. Moisture-retaining curing after formwork removal both improved the development of tensile strength and mitigated the evolution of tensile stress, thereby preventing crack formation. Based on the experimental findings, a multiscale coupled model that integrates compaction and damage effects was employed to establish a quantitative approach for assessing cracks in lining concrete structures, accounting for the evolution of concrete properties. The multiscale model was extended from the material level to the structural level, enabling numerical simulation of the cracking behavior of lining concrete during construction. This provides a finite element-based predictive approach for preventing lining cracking in engineering practice.

从浇筑阶段开始，早期荷载过大、模板过早拆除、不利的温湿度条件等因素都会对水工衬砌混凝土力学性能演化产生不利影响。从结构上讲，这些因素加剧了衬砌内拉应力的发展。当拉应力超过混凝土的抗拉强度时，就会发生开裂。为研究水工衬砌混凝土结构的多尺度开裂机理，设计了一种衬砌混凝土构件加载装置。试验以早期荷载、模板拆除时间、拆除后环境温度和湿度为试验变量。结果表明：早期加载提高了混凝土的抗拉强度，延迟了开裂时间，增大了开裂荷载；将模板拆除时间提前到一天，加速了拉应力的发展，导致裂缝在整个表面蔓延。拆模后的防潮养护既促进了抗拉强度的发展，又缓解了拉应力的演化，从而防止裂缝的形成。在此基础上，采用一种将压实和损伤效应结合起来的多尺度耦合模型，建立了一种考虑混凝土性能演变的衬砌混凝土结构裂缝定量评估方法。将多尺度模型从材料层面扩展到结构层面，实现了衬砌混凝土施工过程中开裂行为的数值模拟。这为工程实践中衬砌裂缝的预防提供了一种基于有限元的预测方法。

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引用次数: 0

Enhancing micro tunnel boring machine efficiency: Optimal design of gauge triple disc cutters 提高微隧道掘进机效率：轨距三盘刀具的优化设计

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

Tunnelling and Underground Space Technology

Pub Date : 2026-04-01 Epub Date: 2025-12-03 DOI: 10.1016/j.tust.2025.107330

Ebrahim Farrokh , Davood Lotfi

This research presents innovative strategies for optimizing the design and layout of gauge triple disc cutters in micro tunnel boring machines (TBMs). Recognizing the pivotal role of cutterhead design in boosting tunneling efficiency and reducing wear, a significant gap in the literature regarding the optimal arrangement of gauge triple disc cutters is addressed. A systematic approach that combines iterative methods and advanced optimization tools is employed to analyze critical geometric and operational parameters, including cutter ring diameters, normal forces, rolling forces, tilt angles, and angular positions. Results demonstrate that optimizing these parameters leads to substantial reductions in off-axis forces and moments, minimizes cutter slippage during operation, and maintains curvature in the gauge area. This study enhances the operational performance of micro TBMs and contributes to the advancement of construction techniques, offering valuable insights for future innovations in tunnel boring technology.

本研究提出了微型隧道掘进机标准三盘刀具优化设计和布局的创新策略。认识到刀盘设计在提高掘进效率和减少磨损方面的关键作用，解决了有关规范三盘刀的最佳配置的文献中的重大空白。采用迭代方法和先进的优化工具相结合的系统方法来分析关键的几何和操作参数，包括刀环直径、法向力、轧制力、倾斜角和角度位置。结果表明，优化这些参数可以显著减少离轴力和力矩，最大限度地减少刀具在操作过程中的滑移，并保持测量区域的曲率。该研究提高了微型隧道掘进机的运行性能，促进了施工技术的进步，为未来隧道掘进技术的创新提供了有价值的见解。

引用次数: 0

Investigating user perception of underground public space from a temporal perspective: A framework using social media data and combining LLMs and BERT models 从时间角度调查地下公共空间的用户感知：一个使用社交媒体数据并结合llm和BERT模型的框架

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

Tunnelling and Underground Space Technology

Pub Date : 2026-04-01 Epub Date: 2025-12-21 DOI: 10.1016/j.tust.2025.107390

Chen-Xiao Ma, Fang-Le Peng, Zi-Jian Li, Tian-Ze Zhang, Yong-Kang Qiao

User perception of underground public space (UPS) includes both space perception and sentiment perception derived from its users. Examining how user perception evolves over time is essential for user-oriented UPS planning and renovation. Social media data provides a novel data source for capturing dynamic interactions between UPS and users. This study developed a text mining-based analytical framework to investigate 15 UPS cases in Shanghai. Large language models (LLMs) and Bidirectional Encoder Representations from Transformers (BERT) models were employed to analyze user perception from a temporal perspective. A total of 27 perception elements, categorized into six groups, were identified and annotated using LLMs. Elements related to space functions were most frequently perceived by users, while space public facilities received the least attention. The diversity of high-frequency perception elements increased from 2006 to 2024. On the other hand, sentimental polarity analysis of complete user reviews using the BERT model effectively assessed UPS satisfaction. User sentiments regarding space function elements have remained stable since 2006. However, user satisfaction with space environment, design and layout, and management elements exhibited an increasing trend. Furthermore, the user-perceived functions of UPS differed from its original planning objectives, highlighting the demands for multi-functional and adaptable UPS during its planning and design. Moreover, regression analysis of UPS sentiments also revealed that optimizing UPS atmosphere and management during renovation enhanced space performance.

Abbreviations: API, application programming interface; NLP, natural language processing; UUS, urban underground space; BERT, Bidirectional Encoder Representations from Transformers; LLM, large language model; UPS, underground public space.

地下公共空间的用户感知包括空间感知和用户情感感知。研究用户感知如何随着时间的推移而演变，对于以用户为导向的UPS规划和改造至关重要。社交媒体数据为捕捉UPS与用户之间的动态交互提供了新的数据源。本研究开发了一个基于文本挖掘的分析框架，以调查上海15个UPS案例。采用大型语言模型（llm）和双向编码器表示（BERT）模型从时间角度分析用户感知。共有27个感知元素，分为六组，使用llm进行识别和注释。与空间功能相关的要素最常被用户感知，而空间公共设施受到的关注最少。高频感知要素的多样性从2006年到2024年呈上升趋势。另一方面，使用BERT模型对完整用户评论进行情感极性分析，有效地评估了UPS满意度。自2006年以来，用户对空间功能元素的看法保持稳定。用户对空间环境、设计布局、管理要素的满意度呈上升趋势。此外，UPS的用户感知功能与其最初的规划目标有所不同，凸显了UPS在规划设计过程中对多功能和适应性的需求。此外，对UPS情绪的回归分析也表明，在改造过程中优化UPS氛围和管理可以提高空间性能。缩写：API，应用程序编程接口；NLP，自然语言处理；UUS：城市地下空间；BERT，变压器的双向编码器表示；LLM，大型语言模型；UPS，地下公共空间。

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引用次数: 0