Tunnelling and Underground Space Technology最新文献

{"title":"SAM4Tun: No-training model for tunnel lining point cloud component segmentation","authors":"Zehao Ye, Wei Lin, Asaad Faramarzi, Xiongyao Xie, Jelena Ninić","doi":"10.1016/j.tust.2025.106401","DOIUrl":"https://doi.org/10.1016/j.tust.2025.106401","url":null,"abstract":"Asset management ensures the safety and longevity of structures through regular maintenance. Reality capture technologies are increasingly being used for asset inspections to obtain information by generating point cloud data, which is becoming more prevalent in tunnel asset management for precise documentation of tunnel geometry and condition. Integrating semantic information from point clouds is crucial for creating accurate as-built Building Information Models (BIM), essential for project delivery, maintenance, and operations. In this paper, we propose SAM4Tun, a zero-shot automated instance segmentation method for tunnel lining segments. It is based on a Large Vision Model (LVM), prompt-based Segment Anything Model (SAM), and various point cloud and image processing techniques, enabling accurate instance segmentation without requiring any training. The process starts by unfolding tunnel point clouds to generate 2D panoramic images, enabling SAM to be extend its capabilities to point cloud segmentation. To enhance performance, we propose: (i) a local point cloud density-variation method to filter out non-segment parts, and (ii) a geometry feature-guided multi-step point cloud up-sampling method to address uneven point cloud density during projection. Then, we focus on prompt engineering, using traditional image processing techniques to automatically generate template prompt, enabling SAM’s zero-shot ability to achieve precise instance-level segmentation of tunnel linings. The results demonstrate that our no-training model achieved highly accurate instance segmentation, even surpassing supervised learning algorithms. The proposed method addresses the issue of data dependency and serves as the foundation for component-level damage localization and displacement monitoring in tunnel. Our code is available at <ce:inter-ref xlink:href=\"https://github.com/zxy239/SAM4Tun\" xlink:type=\"simple\">https://github.com/zxy239/SAM4Tun</ce:inter-ref>.","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"22 1","pages":""},"PeriodicalIF":6.9,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143027394","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment and spatial variation analysis of the collaborative development potential between underground public spaces and urban rail transit in China’s urban central areas","authors":"Xiaochun Hong, Shengcai Li, Wanghu Sun, Xiang Ji","doi":"10.1016/j.tust.2025.106415","DOIUrl":"https://doi.org/10.1016/j.tust.2025.106415","url":null,"abstract":"The collaborative development of underground public spaces (UPS) and urban rail transit (URT) in urban central areas is becoming increasingly common in China. However, the lack of a scientific assessment of collaborative development potential leads to some cities experiencing overdevelopment while others underestimate their development needs. This study addresses this gap by conducting a scientific evaluation of the collaborative development potential between UPS and URT in Chinese urban centers. The significance of this evaluation lies in its contribution to understanding effective urban spatial resource allocation and promoting sustainable urban development and efficient use of underground spaces. A collaborative development potential assessment index system was established, consisting of URT development index (D<ce:inf loc=\"post\">1</ce:inf>), urban development index (D<ce:inf loc=\"post\">2</ce:inf>), urban underground space construction index (D<ce:inf loc=\"post\">3</ce:inf>), urban central area development index (D<ce:inf loc=\"post\">4</ce:inf>), urban central area URT index (D<ce:inf loc=\"post\">5</ce:inf>), and urban central area construction index (D<ce:inf loc=\"post\">6</ce:inf>). The entropy weight method was used to calculate the indicator weights, and the TOPSIS model was employed for evaluating the collaborative development potential. The results revealed significant disparities in the collaborative development potential of UPS and URT across urban centers. Cities with the highest potential, such as Shanghai, Beijing, Shenzhen, and Guangzhou, reached a maximum value of 0.6384. With many new urban centers under construction, it is projected that over the next 5 to 10 years, as ongoing projects are completed, the collaborative development potential will continue to improve. Specific optimization recommendations are provided for varying potentials, aiming to guide the scientific and collaborative development of UPS and URT in urban centers by offering data support and decision-making insights.","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"22 1","pages":""},"PeriodicalIF":6.9,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143027388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unsupervised seepage segmentation pipeline based on point cloud projection with large vision model","authors":"Zhaoxiang Zhang, Ankang Ji, Zhuan Xia, Limao Zhang, Yuelei Xu, Qing Zhou","doi":"10.1016/j.tust.2025.106410","DOIUrl":"https://doi.org/10.1016/j.tust.2025.106410","url":null,"abstract":"Targeting to sustain the operational safety of tunnels, this paper presents a projection-based approach utilizing large vision model (LVM) inference for efficient and effective multi-class segmentation, including the identification of seepage, in 3D point clouds of tunnels. The proposed approach employs an unsupervised strategy based on point projection and label correction to process input point clouds and enhance semantic inference, particularly in distinguishing between seepage and other segment classes. Furthermore, a large vision model is adopted to improve the method with practical application. To assess the method’s effectiveness, real tunnel point cloud data from a cross-river tunnel section in China is utilized. The results demonstrate: (1) The proposed framework excels in unsupervised seepage segmentation, achieving F1 and Accuracy scores of 0.769 and 0.930, respectively; (2) Competitive unsupervised detection results are achieved across multiple classes, with segmentation F1 scores of 0.743, 0.841, 0.983, 0.970, 0.836, and 0.933 for cable, segment, pipe, powertrack, support, and track classes, respectively; (3) The segmentation model outperforms other state-of-the-art unsupervised point cloud segmentation algorithms and demonstrates competitive performance compared to supervised methods. Overall, this developed method holds promise as the foundation for an automated decision-making system, facilitating tunnel surveys and improving segmentation effectiveness.","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"41 1","pages":""},"PeriodicalIF":6.9,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143027389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanism of spillage plumes from multiple openings on ceiling temperature distribution in metro tunnel fires based on superposition principle","authors":"Zhihe Su, Yanfeng Li, Runzhou Luo, Hua Zhong, Junmei Li, Zhihao Geng, Zhicheng Guo","doi":"10.1016/j.tust.2025.106412","DOIUrl":"https://doi.org/10.1016/j.tust.2025.106412","url":null,"abstract":"This study revisits the coupling effects of tunnel ceiling temperature distribution caused by plume escapes from metro carriage doors during a fire. The impact of fire heat release rates on the ceiling temperature distribution under various door-opening scenarios was analysed by utilising the superposition principle. The concept of virtual fire sources was proposed to model the ceiling temperature distribution associated with plume outflows from carriage doors. The results indicate that the ceiling temperature distribution in a metro tunnel fire is primarily influenced by virtual fire sources generated by plumes escaping through multiple doors. The maximum ceiling temperature from a single virtual fire source was significantly lower than that of a real fire, and the temperature decay followed a double exponential function. The heat flow ratio for each door remained nearly constant for different fire heat release rates, and variations in heat flow with door positions were analysed. The incorporation of heat loss terms into the theoretical model improved the accuracy and quantification of heat loss coefficients. A predictive model for the ceiling temperature distribution caused by metro carriage fires was developed based on the superposition principle, with the predictions well aligning with the experimental results. This study enhances our understanding of the ceiling temperature distribution in multi-opening structures and guides scenarios involving multiple fire sources within tunnels.","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"5 1","pages":""},"PeriodicalIF":6.9,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143027391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A laboratory study of conditioning clay-rich soils in seawater environments for EPBS tunnel constructions in coastal areas","authors":"Bingnan Wang, Ming Huang, Yao Lu, Chaoshui Xu, Yu Wang","doi":"10.1016/j.tust.2025.106409","DOIUrl":"https://doi.org/10.1016/j.tust.2025.106409","url":null,"abstract":"Land reclamation from the sea is increasingly common in coastal areas in China as its urban population continues to grow and the construction of subways in these areas becomes an effective way to alleviate transportation problems. Earth pressure balance shield (EPBS) tunneling in reclaimed lands often faces the problem of seawater erosion which can significantly affect the effectiveness of soil conditioning. To investigate the impacts, in this work, the stratum adaptability of EPBS foaming agents in seawater environments was evaluated based on a series of laboratory tests. The Atterberg limits and vane shear tests were carried out to understand the evolution characteristics of mechanical properties of clay-rich soils soaked in seawater and then conditioned with foams. The results revealed that, for the same foaming agents, the liquid limit and plastic limit of soils soaked in seawater were lower than those in deionized water due to the thinning of bound water films adsorbed on the surface of soil particles. Similarly, soils soaked in seawater had lower shear strength. In addition, the results indicated that the foam volume (FV) produced by foaming agents using seawater as the solvent was slightly higher than that when using the deionized water due to the higher hydration capacity of inorganic salt cations in seawater compared with organic substances. It was also shown that seawater had negative effects on the half-life time (T<ce:inf loc=\"post\">1/2</ce:inf>) and the dynamic viscosity (η) of foaming agents due to the neutralization reaction between anions in the foaming agents and Na<ce:sup loc=\"post\">+</ce:sup> present in seawater. The test results also confirmed that 0.5 % of the tackifier (CMC) can alleviate the issue of thin foam films caused by seawater intrusion and improve the dynamic viscosity of foaming agents more effectively, leading to superior resistance to seawater intrusion in EPBS tunnel constructions.","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"74 1","pages":""},"PeriodicalIF":6.9,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143027390","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Seismic failure analysis and simplified prediction methods for underground frame structures at earth fissure sites","authors":"Zhi Chen, Zhongming Xiong, Xuan Chen, Penggang Tian, Jianhui Niu, Zhixun Xie","doi":"10.1016/j.tust.2025.106408","DOIUrl":"https://doi.org/10.1016/j.tust.2025.106408","url":null,"abstract":"Earth fissures pose a significant risk to the seismic safety of underground structures at earth fissure sites (USEFs), particularly for large-scale underground frame structures such as subway stations. To date, the failure mechanism of USEFs has only been analyzed qualitatively and requires further comprehensive investigation. Moreover, the existing failure prediction methods for USEFs are complicated, challenging to execute, time-consuming, and incur significant financial costs, necessitating the establishment of a simple and efficient failure prediction method. This study conducted a shaking table test on a USEF to investigate the dynamic response of earth fissure sites and the seismic damage characteristics of a USEF. Based on the experimental results, a tailored pushover analysis method was developed to predict the seismic failure of the USEF and was applied to reveal its underlying seismic failure mechanisms. It was found that low-frequency ground motions are significantly amplified at the earth fissure site and that the acceleration amplitudes at the hanging wall and footwall are nonuniform. This nonuniform acceleration leads to significant extrusion and separation between the hanging wall and footwall. The extrusion causes the soil to rise, exerting additional axial pressure and bending moments on the lateral resistance members. These additional forces lead to uneven internal force distributions within the USEF, highlighting that structurally weak members are prone to failure and accelerating structural damage. The bottom column at the hanging wall is the critical seismic member of the USEF, which requires focused reinforcement and monitoring to increase resilience. The tailored pushover analysis method accurately represents the deformation characteristics at earth fissure sites. The method captures distinct structural destruction patterns, enhancing its utility in seismic failure prediction for USEFs.","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"32 1","pages":""},"PeriodicalIF":6.9,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143027393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Application of physics-data-driven method to identify the weak interlayers in underground geotechnical engineering","authors":"Zitao Chen, Quansheng Liu, Penghai Deng, Yin Bo, Demei Liu, Yucong Pan, Honggan Yu","doi":"10.1016/j.tust.2025.106416","DOIUrl":"https://doi.org/10.1016/j.tust.2025.106416","url":null,"abstract":"The accurate description of the internal structure of weak interlayers is a prerequisite for the safe construction of deep geotechnical engineering with complicated geological conditions. Geophysical tomography techniques are usually used to detect the mechanical properties and spatial distribution and of deep weak interlayers. However, the mechanical properties of weak interlayers cannot be measured directly and the spatial distribution is conventionally difficult to explain by geophysical tomography techniques with ambiguous and inaccurate. In this work, a novel Physics-Data-Driven Method (PDDM) is proposed to identify the internal structure of weak interlayers based on inverse analysis. The constrained covariance matrix is constructed based on the results of geophysical tomography, and a structure similar to “fault core-damage zone-host rock” is achieved, which accurately describes the spatial distribution of weak interlayers. The field application results of Xiluodu underground chamber show: 1) Compared with conventional inverse analysis, PDDM enhances the convergence of simulation results to the field observations, with the relative error basically within 20%, meeting the engineering precision requirements; 2) PDDM can continuously optimize the spatial distribution of the weak interlayer based on the results of geophysical tomography, and finely identify the internal structure and distribution range. The results of PDDM have positive significance for engineering disaster prevention near weak interlayers.","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"38 1","pages":""},"PeriodicalIF":6.9,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143027387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of slab buckling rockburst of surrounding rock under dynamic and static combined disturbance","authors":"Feng Chen, Ruxuan Li, Kaixing Wang, Yanhong Du, Chun’an Tang, Yishan Pan, Zhuo Dong","doi":"10.1016/j.tust.2025.106417","DOIUrl":"https://doi.org/10.1016/j.tust.2025.106417","url":null,"abstract":"Slab buckling rockburst is a common form of rockburst under high ground stress conditions, posing a serious threat to engineering safety. Based on the catastrophe model of slab buckling rockburst of surrounding rock, the expressions of control variables of a single rock slab and combined rock slab under quasi-static effect in catastrophe theory are obtained. The tendency of rockburst in the deep-buried tunnel under quasi-static and dynamic-static combined disturbances are studied by theoretical analysis and numerical simulation methods using the case study of Jinping II Hydropower Station. The failure depth of surrounding rock during rockburst is quantitatively calculated from both theoretical and numerical simulation. The theoretical calculation results show that the failure depth of slab buckling rockburst in the surrounding rock of the auxiliary tunnel of Jinping II Hydropower Station under quasi-static effect is 0.16 m. The rockburst may occur when the angular frequency of the dynamic load is less than 13.49 rad/s under the dynamic and static combined disturbance, and a minimal dynamic disturbance with an amplitude of 7000 Pa may lead to a rockburst in the surrounding rock. Numerical simulations reveal that the displacement of the surrounding rock is 9.3 cm and the failure depth of the surrounding rock is 0.2 m. The values are consistent with the theoretical calculation results, indicating that the numerical simulation results of RFPA<ce:sup loc=\"post\">2D</ce:sup> are reliable.","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"1 1","pages":""},"PeriodicalIF":6.9,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143027397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical simulation analysis of energy evolution law and distribution characteristics of anchored body unidirectional loading","authors":"Xue-kui Xin, Qing-bin Meng, Hai Pu, Jiang-yu Wu","doi":"10.1016/j.tust.2025.106419","DOIUrl":"https://doi.org/10.1016/j.tust.2025.106419","url":null,"abstract":"Energy serves as the fundamental driver of material failure, and accurately describing the mechanical properties and energy evolution laws of loaded anchored body is crucial for the stability control of surrounding rock in bolt-supported roadways. Based on uniaxial compression tests of rock samples and utilizing the embedded Fish programming language in FLAC<ce:sup loc=\"post\">3D</ce:sup>, numerical models of loaded sandstone specimens and energy models were developed. Through a comparative analysis between FLAC<ce:sup loc=\"post\">3D</ce:sup> numerical simulations and laboratory uniaxial compression test results, the rationality of the energy model was validated, and post-peak strength parameters for the anchored body were established. Employing the PILE and LINER structural elements within FLAC<ce:sup loc=\"post\">3D</ce:sup>, models for pre-stress diffusion in anchor bolts and energy evolution in anchored body were constructed. These models explored the distribution characteristics of tensile and compressive stress zones within anchored body during pre-stress release, as well as the pressure arch effect. Furthermore, the fracture behavior of anchored body and bolt load characteristics under different support and drilling size and density conditions were analyzed. The study revealed the evolution and distribution patterns of total energy density, elastic energy density and dissipated energy density during both the pre-peak and post-peak stages of anchored body. The mechanical effects and energy evolution laws of anchored body and bolts exhibit distinct stage − specific characteristics.","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"15 1","pages":""},"PeriodicalIF":6.9,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143027396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Optimization study of cooling parameters of the high-temperature working face in underground engineering","authors":"Song Xin, Yiwen Hu, Shangxiao Liu, Zhen Zhang","doi":"10.1016/j.tust.2025.106420","DOIUrl":"https://doi.org/10.1016/j.tust.2025.106420","url":null,"abstract":"To address the escalating thermal risks and suboptimal cooling capacity distribution of centralized refrigeration systems in large-width faces, this study developed a specialized “high-efficiency air cooler for working faces” and introduced an innovative cooperative cooling strategy integrating air coolers, dust suppression water, and emulsion (A-D-E system). Numerical simulations and field measurements were conducted to evaluate the thermal environment under both traditional cooling methods and the A-D-E synergistic approach. The analysis revealed that, for a 250 m-wide mining face, optimal cooling performance was achieved by strategically placing five air coolers along a gradient. Employing the A-D-E system reduced the average face temperature by 8 K and expanded the comfort zone to cover 96 % of the working area. This approach effectively mitigates excessive heat challenges in large-width faces, enhances the utilization of coolant resources in centralized refrigeration units, and provides a forward-looking framework for advancing cooling strategies in deep mining operations.","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"19 1","pages":""},"PeriodicalIF":6.9,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143027398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}