Tunnelling and Underground Space Technology最新文献

{"title":"Study of atomization characteristics and dust suppression effect of micro-nano bubble enhanced ultrasonic dry fog in excavation working face","authors":"Xinzhe Wang ,&nbsp;Pengfei Wang ,&nbsp;Gaogao Wu ,&nbsp;Yongjun Li","doi":"10.1016/j.tust.2025.106713","DOIUrl":"10.1016/j.tust.2025.106713","url":null,"abstract":"<div><div>To optimize spray-based dust capture efficiency at coal mine working face, a novel micro-nano bubble enhanced ultrasonic dry fog dust suppression approach was developed. The characteristics of micro nano bubbles water were studied through wettability experiments and the dust suppression effect of micro nano bubbles water and tap water was compared by using the custom-designed spray dust suppression experimental platform. Experimental results indicate that micro-nano bubble water increases the concentration of negative ions around the spray area compared to tap water. Additionally, the surface tension of micro-nano bubble water is 9.3 mN/m lower than that of tap water and the contact angle of micro-nano bubble water with coal particles is 5.76° smaller than that of tap water. Application findings of tunnel working face confirm that the micro-nano bubble ultrasonic dry fog purification system achieving average suppression efficiencies of 60.43 % for total dust and 44.84 % for respirable dust, representing a relative improvement of over 30 % compared to the conventional purification system. Moreover, the micro-nano airflow dry fog purification system consumes water at an average rate of 5.13 L/min, which is 2.43 L/min lower than the conventional water curtain purification system, indicating a relative reduction in water usage by more than 30 %. Evidently, the micro-nano bubble ultrasonic dry fog purification system delivers effective dust control and reduce water consumption.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"163 ","pages":"Article 106713"},"PeriodicalIF":6.7,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921775","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":"Ontology-driven knowledge graph for decision-making in resilience enhancement of underground structures: Framework and application","authors":"Bin-Lin Gan ,&nbsp;Dong-Mei Zhang ,&nbsp;Zhong-Kai Huang ,&nbsp;Fei-Yu Zheng ,&nbsp;Rui Zhu ,&nbsp;Wei Zhang","doi":"10.1016/j.tust.2025.106739","DOIUrl":"10.1016/j.tust.2025.106739","url":null,"abstract":"<div><div>Enhancing the resilience of underground structures for their operation safety amidst complex disasters has become a critical societal issue. However, resilience enhancement decision-making for underground structures mainly depends on practical subjective experience currently, with insufficient integration of ontology knowledge and a clear gap in the availability of efficient and intelligent decision-making models. To address this, this paper presents a novel method for constructing a knowledge graph (KG) based on ontology to enhance the resilience of underground structures. A comprehensive resilience knowledge system considering 10 categories for underground structures is established. This system is built upon resilience quantification analysis, fault tree modeling of resilience insufficiency, and event tree analysis of disaster chain processes. A systematic approach for KG construction, integrating top-down and bottom-up strategies, is then proposed. Additionally, a multi-layered framework of KG for underground structure resilience is developed, comprising application, rule, pattern, and data layers. Resilience-related knowledge is extracted using expert empirical methods, and the data layer is constructed through semantic networks and knowledge fusion. The visualization and field application of the KG are implemented using the Neo4j graph database. Findings of this study substantially advance a methodological foundation for intelligent decision-making in resilience enhancement and safeguarding of underground infrastructures under complex disasters.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"163 ","pages":"Article 106739"},"PeriodicalIF":6.7,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143928389","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":"Novel ventilation for dust suppression and dilution of gas: A synergistic approach to front-split vortex-air curtains","authors":"Haiming Yu ,&nbsp;Peibei Wang ,&nbsp;Xinyue Zhang ,&nbsp;Na Qin","doi":"10.1016/j.tust.2025.106740","DOIUrl":"10.1016/j.tust.2025.106740","url":null,"abstract":"<div><div>In order to solve the problem of excessively high dust and gas concentration in continuous mining face, this paper puts forward a front split air technology which can control gas concentration while reducing dust pollution on the basis of not affecting on-site coal mining operations, summarizes the on-site dust and gas pollution diffusion law, and reveals the dust control mechanism of front split air technology. It provides a strong support for the safe and efficient production of coal face. The results show that too small pressure air volume will lead to less air flow in the head area, and a large amount of air flow will be absorbed by the fan, resulting in dust deposition, but the gas concentration is as high as 1.88 %. The increase of pressure air volume will increase the vortex and wind curtain intensity in the head area, and the increase of pressure air volume will lead to the increase of dust in the breathing belt at the front and back of the roadway, which will increase to 249.6 mg/m³. If the pressure pumping ratio is too small, the eddy current intensity will increase, and the dust will be inhaled by the fan. If the pressure pumping ratio is too large, the dust diffusion distance will gradually decrease to 6.5 m, and almost dust will be distributed behind the roadway, but gas will accumulate at the front end of the roadway, and the concentration will be as high as 2.27 %. Under the optimal ventilation conditions, the gas concentration on the continuous mining face is limited to less than 0.6 %, and the dust concentration at the back end of the roadway is controlled to less than 4.0 mg/m³. Compared with the traditional ventilation mode, the dust control efficiency at the back of the roadway is increased by more than 98 %, and the gas and dust concentrations on site are effectively controlled. This study will provide a new feasible research scheme for ventilation technology to solve the dust and gas pollution of continuous mining working face.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"163 ","pages":"Article 106740"},"PeriodicalIF":6.7,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143928388","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":"Review of geophysical data acquisition methods for underground feature detection and future trends","authors":"Chuanyang Peng,&nbsp;Chao Wang,&nbsp;Zili Li","doi":"10.1016/j.tust.2025.106731","DOIUrl":"10.1016/j.tust.2025.106731","url":null,"abstract":"<div><div>Accelerated human activities and the growing demand for natural resources have facilitated the need for a comprehensive understanding of subsurface environments. This paper comprehensively reviews non-destructive geophysical data acquisition methods for underground feature detection (UFD), focusing on wave-based methods (e.g., seismic and acoustic waves), electromagnetic field-based methods (e.g., electrical resistivity tomography (ERT) and transient electromagnetic method (TEM)), and density contrast-based methods (gravimetry and muography). The principles, historical development, current research trends and field applications of each method are discussed, with their respective advantages and limitations analysed. Wave-based methods, such as ground-penetrating radar and seismic reflection, offer high-resolution imaging for near-surface cavities but are constrained by signal attenuation and geological heterogeneity. Electromagnetic methods provide deeper penetration but are affected by external interference and conductivity variations. Density contrast-based methods provide stable and non-invasive detection of deeply buried cavities, although conventional gravimeters face challenges related to resolution and sensitivity. Quantum gravimeter, the most recent advancement, leverages atomic interferometry for unparalleled precision, yet its widespread adoption remains constrained by issues of portability, environmental stability, and cost. Future advancements will focus on enhancing detection accuracy, improving real-world applicability, and integrating artificial intelligence to automate data processing and refine multi-method data fusion.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"163 ","pages":"Article 106731"},"PeriodicalIF":6.7,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922334","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":"Experimental study on flame behaviour characteristics induced by unequal double fires in a tunnel under different ventilation modes","authors":"Mingxuan Qiu ,&nbsp;Yanfeng Li ,&nbsp;Lin Xu ,&nbsp;Shengzhong Zhao ,&nbsp;Longyue Li ,&nbsp;Hua Zhong","doi":"10.1016/j.tust.2025.106730","DOIUrl":"10.1016/j.tust.2025.106730","url":null,"abstract":"<div><div>Unequal double fires may cause more serious disasters due to their complex interaction mechanisms, especially in the case of longitudinal ventilation. However, previous studies have paid little attention to this spot. Therefore, this study presents an experimental investigation into flame behaviour characteristics induced by unequal double fires in a tunnel under different ventilation modes. Using a reduced‐scale tunnel model based on Froude scaling, the effects of varying heat release rates (HRR), fire source separation distances (<em>S</em>), and longitudinal ventilation velocities (<em>v</em>) on flame merging, tilt angles, and mean flame lengths are systematically examined. These findings reveal that unequal HRR configurations yield lower merging probabilities compared to equal HRR scenarios under natural ventilation. Moreover, the flame merging probability exhibits a non‐monotonic relationship with ventilation velocity, and reaches a peak value at <em>v</em> = 0.2 m/s. Furthermore, the flame tilt behaviour and the role of its differences in flame merging are elucidated. Notably, the mean flame length of one fire is relatively insensitive to variations in the HRR of the adjacent fire, and the normalised mean flame length is independent of the merging state. Based on the detailed analysis, novel prediction models for flame tilt angles, incorporating the influence of pressure differential forces, and for normalised mean flame length are proposed. Although the experiments are limited to low ventilation velocities (<em>v</em> ≤ 0.5 m/s), the results provide practical insights for tunnel fire safety design. These results represent the first quantification of flame tilt angles and mean flame lengths under differential pressure forces in longitudinal ventilation, thereby bridging a critical gap in tunnel fire dynamics research.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"163 ","pages":"Article 106730"},"PeriodicalIF":6.7,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921778","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":"Discrimination, mechanical mechanisms, and control technologies for large deformation in tunnel surrounding rock: A state-of-the-art review","authors":"Tao Zhang ,&nbsp;Xiangcou Zheng ,&nbsp;Shuying Wang ,&nbsp;Junsheng Yang ,&nbsp;Xiangsheng Chen","doi":"10.1016/j.tust.2025.106712","DOIUrl":"10.1016/j.tust.2025.106712","url":null,"abstract":"<div><div>Large deformation of surrounding rock presents a critical challenge that urgently requires attention in tunnel engineering. This study provides a systematic review of the definition, classification, grading, mechanical mechanisms, and control techniques related to large deformations in surrounding rock. First, the origin of the large deformation concept is systematically analysed, and different types of large deformations are categorized based on factors such as stratum properties, environmental conditions, and deformation causes. Representative grading methods for large deformations are summarized and critically evaluated. Subsequently, the mechanical mechanisms and existing analytical methods for various types of large deformations, such as those encountered in soft rock and squeezing rock, are thoroughly examined. Moreover, this paper identifies key directions for future research breakthroughs in understanding deformation mechanisms. Finally, principles and measures for controlling large deformations are elaborated, including strategies for selecting support systems and construction methods for tunnels in areas prone to large deformations. Additionally, the methods for predicting large deformations in surrounding rock are introduced, laying a foundation for rational and effective deformation control.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"163 ","pages":"Article 106712"},"PeriodicalIF":6.7,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143922335","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":"Dynamic sub-structure method for longitudinal seismic response of large-diameter shield tunnel through the complex strata","authors":"Zhuang Haiyang ,&nbsp;Li Xiaoxiong ,&nbsp;Zhao Kai ,&nbsp;Hu Mingluqiu","doi":"10.1016/j.tust.2025.106680","DOIUrl":"10.1016/j.tust.2025.106680","url":null,"abstract":"<div><div>Based on the deficiencies of the generalized response displacement method and the integral response displacement method for longitudinal seismic analysis of the shield tunnel, the dynamic sub-str1cture analysis method for longitudinal seismic response of a large-diameter shield tunnel crossing the complex soil layer is proposed. The feasibility and superiority of the dynamic sub-structure analysis method are explored by comparing it with the calculation results of the three-dimensional (3D) soil-underground structure interaction model. Then, a finite element refined 3D model of the 2.7 km Suai submarine shield tunnel is established by using the proposed method, and the longitudinal seismic response of the large-diameter shield tunnel crossing complex soil layers is simulated and analyzed. The research results indicate that the proposed dynamic sub-structure method has clear concepts, accurate calculation results and high efficiency to simulate the dynamic soil-tunnel interaction, which can avoid the error effect of the equivalent soil spring used in the generalized response displacement method. At the same time, this method can consider the seismic effect of the complex soil layers which has been avoided by the generalized response displacement method and the integral response displacement method. Also, the calculation results by the proposed method can comprehensively present the typical earthquake damages of shield tunnels crossing the wide river valley or the strait. It proves that it is not appropriate to simplify the longitudinally of the shield tunnel into a straight line, as doing so would neglect the influence of the longitudinal slope of complex river valleys or the straits. Also, the longitudinal seismic response of the shield tunnel is more sensitive to low-frequency seismic waves and the bolts are more susceptible to seismic damage compared to the segment opening.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"163 ","pages":"Article 106680"},"PeriodicalIF":6.7,"publicationDate":"2025-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921777","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":"Adaptability-enhanced evacuation path optimization and safety assessment for subway station passengers in floods: From uncertain challenge to reliable escape","authors":"Xiaoxia Yang ,&nbsp;Haojie Zhu ,&nbsp;Jiahui Wan ,&nbsp;Yongxing Li ,&nbsp;Zehao Chen","doi":"10.1016/j.tust.2025.106683","DOIUrl":"10.1016/j.tust.2025.106683","url":null,"abstract":"<div><div>Subway stations face an increasingly serious risk of flooding as climate change leads to frequent extreme rainfall events. The suddenness of external flood disasters and the uncertainty of hazard factors have posed severe challenges to the safety and reliability of traditional evacuation plans in complex closed space structures and dense passenger flow environments. To address the above technical demands and problems, we propose a robust path optimization model and safety assessment method for passenger evacuation paths in flood scenarios, aiming to improve escape efficiency and safety while avoiding the sensitivity of the optimization scheme to parameter disturbances. The robust optimization model of the evacuation path constructs the evacuation time and road risk uncertainties through the box-type intersection budget uncertainty sets, so that the optimization strategy can find a balance between efficiency and risk and has strong adaptability; a new QIPSO algorithm is proposed to solve the model; the adopted relative entropy weighting model (REWM) introduces the relative entropy theory into the entropy weighting model, which can reasonably deal with the differences and consistency of different weight vectors among safety evaluation indicators. The performance analysis of the passenger evacuation simulation effect under the environment of flood intrusion in a subway station is carried out. The results show that: (i) the robust path optimization model can seek feasible and reliable evacuation decision-making solutions under the uncertain environment caused by floods; (ii) the designed innovative QIPSO algorithm shows strong potential in reducing evacuation time, alleviating passenger congestion and reducing instability risks when solving the robust model; (iii) the evaluation results based on the REWM further verify that the evacuation path optimization strategy can effectively improve the safety level of the station in dealing with flood risks.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"163 ","pages":"Article 106683"},"PeriodicalIF":6.7,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143921776","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":"Investigations on mechanical behavior of longitudinal joints in segmental tunnel linings reinforced with epoxy bonded-bolted steel plates","authors":"Xian Liu ,&nbsp;Jianyu Hong ,&nbsp;Zhen Liu","doi":"10.1016/j.tust.2025.106724","DOIUrl":"10.1016/j.tust.2025.106724","url":null,"abstract":"<div><div>For shield tunnel linings reinforced with epoxy bonded-bolted steel plates, the mechanical behavior of longitudinal joints is a key factor affecting the overall load-bearing capacity and durability of the structure. However, current research and design efforts mostly remain at the conceptual or qualitative analysis stage, with insufficient consideration of the collaborative mechanical behavior of components such as steel plates, epoxy adhesive, and chemical anchors. The corresponding design method is also missing. Therefore, to thoroughly investigate the mechanical behavior and failure process of longitudinal joints reinforced with epoxy bonded-bolted steel plates and to quantify the contributions of steel plates, epoxy adhesive, and chemical anchors to the joint’s mechanical performance, in this study, full-scale joint tests under positive and negative bending moments and develop three-dimensional refined nonlinear finite element models of the longitudinal joints are conducted. By conducting parameter attribution analysis, the key factors affecting the macroscopic mechanical performance indicators of the joint are identified, the roles of steel plates, epoxy adhesive, and chemical anchors are also revealed. The research provides a theoretical basis for the design and application of shield tunnel structures reinforced with epoxy bonded-bolted steel plates. The study results are as follows: (1) The failure of longitudinal joints reinforced with epoxy bonded-bolted steel plates can be divided into three stages: elastic stage, stress redistribution stage, and ultimate failure stage. (2) The bearing capacity of the reinforced joints is mainly determined by the dimensions of the steel plates and the shear performance of the epoxy adhesive interface, while stiffness is determined by the steel plate dimensions. Ductility depends on the steel plate dimensions, epoxy adhesive shear performance, and chemical anchors. (3) Under positive bending moments, the steel plates share the stress of the bolts, while under negative bending moments, they strengthen the intrados concrete of the joint. (4) The epoxy adhesive connects the steel plates and longitudinal joint, with tension-shear composite failure occurring under positive bending moments and compression-shear composite failure under negative bending moments. (5) After the epoxy adhesive interface fails, the chemical anchors promptly share the interface load, providing additional safety reserves.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"163 ","pages":"Article 106724"},"PeriodicalIF":6.7,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143907754","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":"ITA guidelines for the preparation of the GBR for the NEC4 engineering and construction contracts – Options B and D with bill of quantities","authors":"Alexandre Gomes ,&nbsp;Hannes Ertl ,&nbsp;Andres Marulanda ,&nbsp;Matthias Neuenschwander ,&nbsp;Bill Newns","doi":"10.1016/j.tust.2025.106656","DOIUrl":"10.1016/j.tust.2025.106656","url":null,"abstract":"<div><div>This guideline outlines the recommendations of the International Tunnelling and Underground Space Association (ITA) for preparing a Geotechnical Baseline Report (GBR) for the NEC4 Engineering and Construction Contract (ECC), specifically for Options B or D, with use of a Bill of Quantities. This document complements and should be read alongside the “Guidance on NEC and Underground Works (2025)” (hereafter referred to as “NEC-ITA Guidance (2025)”), which provides a model clause and guidance for implementing an alternative risk allocation approach using a GBR within the NEC4 ECC.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"163 ","pages":"Article 106656"},"PeriodicalIF":6.7,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143907755","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}