Tunnelling and Underground Space Technology最新文献_第6页

Novel automated repair approaches for masonry tunnels: Feasibility and sustainability 新型砌体隧道自动修复方法：可行性和可持续性

IF 6.7 1区工程技术

Tunnelling and Underground Space Technology Pub Date : 2025-04-11 DOI: 10.1016/j.tust.2025.106645

A. Blanco , E. Al-Ameen , A. Brown , P. Kinnell , S. Cavalaro

引用次数: 0

Effects of pedestrians’ visual search effectiveness and behavioral characteristics on the wayfinding performance at underground rail interchange stations: A field test study 行人视觉搜索效能与行为特征对地下轨道交通换乘站寻路性能的影响

IF 6.7 1区工程技术

Tunnelling and Underground Space Technology Pub Date : 2025-04-10 DOI: 10.1016/j.tust.2025.106617

Jinshuan Peng , Chaoyu Ren , Liuting Lan , Xiongbo Cui , Linjun Zhang , Mengqing Wu

{"title":"Effects of pedestrians’ visual search effectiveness and behavioral characteristics on the wayfinding performance at underground rail interchange stations: A field test study","authors":"Jinshuan Peng , Chaoyu Ren , Liuting Lan , Xiongbo Cui , Linjun Zhang , Mengqing Wu","doi":"10.1016/j.tust.2025.106617","DOIUrl":"10.1016/j.tust.2025.106617","url":null,"abstract":"<div><div>This study explored the impact of wayfinding signs and individual differences on wayfinding performance in interchange spaces, particularly within underground rail interchange stations. Previous research has primarily focused on either the visual effects of signs or wayfinding outcomes, with limited consideration of their interactions. Therefore, this study used Ranjiaba station, Chongqing Rail Transit, as a case study, classifying wayfinding tasks into four categories. On-site wayfinding eye-tracking experiments analyzed and discussed sign perception characteristics, fixation behaviors, and wayfinding manifestations among different pedestrian groups. The K-means clustering algorithm was employed for graded evaluation of wayfinding performance. The findings revealed three key points. First, visual search behaviors differed between demographic groups. Males outperformed females in identifying the quantity and content of guide signs, with an effective visual identification rate (EVIR) and an effective fixation duration rate (EFDR) of 73.1% and 63.1%, respectively. Further, middle-aged participants had the highest EVIR and EFDR, whereas seniors—who often spend more time on irrelevant guide signs—had the lowest rates. The type and amount of information on signs significantly affected visual search effectiveness. Second, using direction strategies and selecting shortest paths can improve wayfinding efficiency. Third, senior group accounted for 53.8% of the participants demonstrating the lowest wayfinding performance, with senior females representing a vulnerable subgroup. This study offers recommendations for enhancing wayfinding performance through sign design and pedestrian perspectives, providing theoretical insights to improve wayfinding efficiency in rail interchange stations.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"162 ","pages":"Article 106617"},"PeriodicalIF":6.7,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143806947","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}

引用次数: 0

Thermal comfort and structural optimization of Shavadans: a multi-criteria approach Shavadans的热舒适和结构优化：一个多标准的方法

IF 6.7 1区工程技术

Tunnelling and Underground Space Technology Pub Date : 2025-04-10 DOI: 10.1016/j.tust.2025.106620

Faezeh Babaee, Shahin Heidari

引用次数: 0

The characteristics and mechanism of microwave-induced subsurface fracturing of hard rock at different burial depths 不同埋深下微波致硬岩地下破裂特征及机理

IF 6.7 1区工程技术

Tunnelling and Underground Space Technology Pub Date : 2025-04-10 DOI: 10.1016/j.tust.2025.106615

Tianyang Tong, Feng Lin, Shiping Li, Xiangxin Su

{"title":"The characteristics and mechanism of microwave-induced subsurface fracturing of hard rock at different burial depths","authors":"Tianyang Tong, Feng Lin, Shiping Li, Xiangxin Su","doi":"10.1016/j.tust.2025.106615","DOIUrl":"10.1016/j.tust.2025.106615","url":null,"abstract":"<div><div>Microwaves can be used to fracture hard rock and have the potential to be combined with tunnel boring machines. Deep engineering rock mass is usually in a true triaxial stress state. The microwave-induced subsurface fracturing characteristics and mechanism of hard rocks at different burial depths are unclear and need to be studied for microwave application in deep engineering. In this work, using a true triaxial microwave-assisted dual-mode mechanical cutting test system, microwave irradiation tests of Chifeng basalt under different true triaxial stress states were carried out. The acoustic emission signals were monitored in real time during microwave irradiation. After microwave irradiation, the ultrasonic wave velocities were measured, and mechanical cutting tests were also conducted. The experimental results reveal that ejected rock fragments and cracks appear on the basalt surface under microwave irradiation at different true triaxial stress levels. As the true triaxial stress level increases, the ejected rock fragment mass, the area of the spalling zone, and the depth of the spalling zone center of the samples after microwave irradiation tend to increase; the total crack number and length tend to decrease; the P-wave velocity reduction rate on the sides of the sample and the cumulative acoustic emission counts exponentially decrease; and the cutting rock debris mass tends to increase. The increase in true triaxial stress promotes the formation and expansion of the spalling zone and inhibits the development of side cracks; the P-wave velocity reduction rate cannot fully reflect the cutting effect. The research results can provide guidance for the design of microwave parameters and the evaluation of microwave cracking effects under true triaxial stress conditions.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"162 ","pages":"Article 106615"},"PeriodicalIF":6.7,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143815314","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}

引用次数: 0

Design approach for flexural properties of engineered geopolymer composite shield tunnel segments reinforced with GFRP bars GFRP筋加固工程地聚合物复合盾构隧道管片抗弯性能设计方法

IF 6.7 1区工程技术

Tunnelling and Underground Space Technology Pub Date : 2025-04-10 DOI: 10.1016/j.tust.2025.106639

Hu Feng , Pengxu Su , Chang Su , Xin Xin , Yunhui Chen , Yulei Bai

{"title":"Design approach for flexural properties of engineered geopolymer composite shield tunnel segments reinforced with GFRP bars","authors":"Hu Feng , Pengxu Su , Chang Su , Xin Xin , Yunhui Chen , Yulei Bai","doi":"10.1016/j.tust.2025.106639","DOIUrl":"10.1016/j.tust.2025.106639","url":null,"abstract":"<div><div>To improve the durability and crack resistance of shield tunnel segments, glass fiber-reinforced polymer (GFRP) bars reinforced engineered geopolymer composite (EGC) segments, referred to as EGC-FRP segments, were introduced as a replacement for conventional steel reinforced concrete segments. Experimental study on flexural properties of EGC-FRP segments was conducted. Effects of EGC and reinforcement ratio were analyzed. In addition, a numerical investigation of EGC-FRP segments based on finite element (FE) analysis was performed. The results showed that EGC has more cracks and a smaller crack width than concrete under tensile load and has residual strength after cracking due to the fibers in it, which leads to strong synergistic loading ability between EGC and GFRP bars. The maximum crack width of the EGC-FRP segment is reduced by 66.11% under the same reinforcement ratio. Meanwhile, EGC segments exhibited higher flexural strength, deflection, and post-cracking stiffness than those of the concrete segment. In particular, the ultimate flexural strength is increased by 96.44% compared to that of the concrete segment. A FE model developed based on the experimental results showed a good correlation with the test data. The model was used to analyze the flexural behavior of EGC-FRP segments with different reinforcement ratios. Finally, calculation methods for the flexural strength and deflection of EGC-FRP segments were proposed.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"162 ","pages":"Article 106639"},"PeriodicalIF":6.7,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143815411","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}

引用次数: 0

Built environment and thermal comfort in metro systems: A case study in South China 地铁系统的建筑环境与热舒适：以华南地区为例

IF 6.7 1区工程技术

Tunnelling and Underground Space Technology Pub Date : 2025-04-10 DOI: 10.1016/j.tust.2025.106621

Zhaosong Fang , Tongye Guo , Fangfang Li , Xiwen Feng , Zhihong Zhai

{"title":"Built environment and thermal comfort in metro systems: A case study in South China","authors":"Zhaosong Fang , Tongye Guo , Fangfang Li , Xiwen Feng , Zhihong Zhai","doi":"10.1016/j.tust.2025.106621","DOIUrl":"10.1016/j.tust.2025.106621","url":null,"abstract":"<div><div>The unique environmental conditions of underground metro systems pose challenges for occupant comfort. This study evaluated thermal, acoustic, lighting, and air quality environments at metro station entrances and platforms in Guangzhou, China, using environmental measurements and subjective questionnaire surveys. Key findings include: (1) The neutral SET was higher at platforms (21.6 °C) than that at entrances (19.6 °C) due to transient thermal conditions. Comfortable temperatures at platforms ranged from 21.6 to 28.8 °C, exceeding operating temperatures (22.4 – 26.5 °C) and indicating potential for energy savings. (2) Noise levels at platforms (76.4 dB) and entrances (76.4 – 84.9 dB) were within acceptable ranges, and platform lighting met national standards. However, entrance illuminance was often deemed unacceptable. (3) Air quality parameters met national standards, but respondent acceptable levels for VOC (0.003 µg/m<sup>3</sup>), CH<sub>2</sub>O (0.048 µg/m<sup>3</sup>), and PM10 (28.0 µg/m<sup>3</sup>) were significantly stricter. These findings highlight the need for region-specific environmental control to enhance the comfort and energy efficiency of subtropical metro systems. Further, our results provide guidance for the environmental design and energy efficiency retrofitting of metro stations in humid and hot regions.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"162 ","pages":"Article 106621"},"PeriodicalIF":6.7,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143806948","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}

引用次数: 0

Analysis of Herschel–Bulkley fluids flow through rough-walled rock fractures Herschel-Bulkley流体在粗壁岩石裂缝中的流动分析

IF 6.7 1区工程技术

Tunnelling and Underground Space Technology Pub Date : 2025-04-09 DOI: 10.1016/j.tust.2025.106636

Bo Li , Min Tang , Ye Wang , Liangchao Zou

{"title":"Analysis of Herschel–Bulkley fluids flow through rough-walled rock fractures","authors":"Bo Li , Min Tang , Ye Wang , Liangchao Zou","doi":"10.1016/j.tust.2025.106636","DOIUrl":"10.1016/j.tust.2025.106636","url":null,"abstract":"<div><div>Cement grouts are typical non-Newtonian fluids, the flow behavior of which through fractured strata is governed by rheological properties of the grouts (e.g., yield stress and viscosity) and geometrical characteristics of rock fractures (e.g., surface roughness and variable aperture structures). Particularly, the complex void structure of rock fractures renders the flow field complex and heterogeneous, significantly increasing the difficulty of theoretically predicting the pressure gradient – flow rate relation that is essential for rock grouting in engineering practice. In this study, we aim to analyze the effect of aperture structure on flow behavior of Herschel-Bulkely (H–B) grout flow in rough-walled rock fractures. Here, H–B fluids were prepared using Sodium Polyacrylate solutions and flow experiments were conducted on 3D-printed rough-walled fracture and smooth parallel-plate models. Grout flow through these models were numerically simulated based on the regularized Herschel–Bulkely–Papanastasiou (H–B–P) rheological model. Well-matched results were obtained between experimental and numerical results that validated the numerical method. The fracture surface was then decomposed into three levels using a wavelet analysis subject to different normal stresses to create a series of aperture structures for numerical simulations of the flow process. A regressively fitted function based on numerical results was developed that can reflect the deviation of grout flow through a rough-walled model from a parallel-plate model. This modified theoretical model was validated by applying it to predict the pressure gradient-flow rate relation of another rough-walled fracture independently. The high-resolution experimental and numerical results revealed the response of H–B fluid flow to the applied normal stress and roughness; the modified theoretical model can readily be used to predict H–B fluids flow through rough-walled rock fractures, which is useful for rock grouting analysis in engineering practice.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"162 ","pages":"Article 106636"},"PeriodicalIF":6.7,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143806946","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}

引用次数: 0

Synergistic priority utilization of multiple underground resources: Concept, methods, and application 地下多种资源协同优先利用：概念、方法及应用

IF 6.7 1区工程技术

Tunnelling and Underground Space Technology Pub Date : 2025-04-09 DOI: 10.1016/j.tust.2025.106642

Haoyu Wang , Dongjun Guo , Lingxiang Wei , Jingwen Su , Hongxu Zhao , Xingxing Zhao

{"title":"Synergistic priority utilization of multiple underground resources: Concept, methods, and application","authors":"Haoyu Wang , Dongjun Guo , Lingxiang Wei , Jingwen Su , Hongxu Zhao , Xingxing Zhao","doi":"10.1016/j.tust.2025.106642","DOIUrl":"10.1016/j.tust.2025.106642","url":null,"abstract":"<div><div>Multiple major resources exist below the ground: space, water, geothermal energy, and geomaterials. While the necessity of using multiple underground resources (MURs) has been extensively studied, the literature lacks examinations assessing the interaction relationship of MURs and the method of clarifying the priority utilization type (including synergistic use and individual use) and its scope of MURs, which hinders the policy making and planning formulation of MURs synergistic utilization. This paper seeks to fills these above-mentioned gaps and proposes a scheme of the synergistic priority utilization of MURs in the public center and its surrounding of Hangzhou Sanjianghui area. First, exclusion, competition and accompaniment, three types of relationships existing among multiple underground resources including space, geothermal energy, water and geomaterials were identified upon the deep dissection of typical cases and research results of the interactions among underground resources. Second, based on the interactions of MURs and the multi-agent system (MAS), a method for simulating the interactions of MURs and clarifying the priority type and its scope of MURs utilization was developed. Finally, with the public center and its surrounding of Hangzhou Sanjianghui area as an example, the rationality of the method established in this study was verified. The results indicate that the priority of using underground space resources is 9.6 km<sup>2</sup> and 2.0895 × 10<sup>8</sup> m<sup>3</sup> for the geomaterial resources in the study area. The proposed method can fill the gap in decision support tools for using MURs. The findings of this work provide a sound understanding of MURs synergistic utilization mechanism, which is supposed to be conducive to the sustainable utilization of MURs and the formulation of MURs planning.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"162 ","pages":"Article 106642"},"PeriodicalIF":6.7,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143806945","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}

引用次数: 0

Performance of a large-span deep excavation in saturated fine-grained soil adjacent to a historical building: A case study 历史建筑附近饱和细粒土中大跨度深基坑开挖性能：案例研究

IF 6.7 1区工程技术

Tunnelling and Underground Space Technology Pub Date : 2025-04-09 DOI: 10.1016/j.tust.2025.106638

Hamed Bayesteh , Mohsen Sabermahani , Hassan Ostadhossein , Hamidreza Elahi

{"title":"Performance of a large-span deep excavation in saturated fine-grained soil adjacent to a historical building: A case study","authors":"Hamed Bayesteh , Mohsen Sabermahani , Hassan Ostadhossein , Hamidreza Elahi","doi":"10.1016/j.tust.2025.106638","DOIUrl":"10.1016/j.tust.2025.106638","url":null,"abstract":"<div><div>A 14-m deep excavation in fine-grained soil below the groundwater level with 50,000 m<sup>2</sup> Area has been carried out in the vicinity of a sensitive historical building. Diaphragm walls combined with either tie-back anchors, a buttress wall or a moment-resisting frame were used to protect the structures. A comprehensive monitoring system was developed to evaluate the groundwater situation, deformations and the stresses. the lessons learned from the project are presented and the different retaining systems have been evaluated. The results of monitoring showed that the use of a tie-back diaphragm wall caused a 20 % decrease in horizontal deformation of the wall compared to the moment-resisting frame. Back analysis based on the results of inclinometers showed that the predictions of a generalized soil-hardening model was more compatible with the monitored data than the small-strain hardening model. Data from the piezometers installed between the layers showed that it was not easy to ensure sealing of the interlayer clayey lenses as a bottom plug. This meant that the diaphragm walls should penetrate into suitably thick clay layers. The strain gauges in the structural elements were highly sensitive to variations in temperature, making it necessary to perform temperature analysis on the retaining structures.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"162 ","pages":"Article 106638"},"PeriodicalIF":6.7,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143806854","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}

引用次数: 0

Correlating permeability coefficients of fractured rock mass in unidirectional and radial flow Configurations: Method and Application 单向流与径向流状态下裂隙岩体渗透系数的关联：方法与应用

IF 6.7 1区工程技术

Tunnelling and Underground Space Technology Pub Date : 2025-04-09 DOI: 10.1016/j.tust.2025.106634

Zhechao Wang, Kanglin Li, Tian Zheng, Jie Liu

{"title":"Correlating permeability coefficients of fractured rock mass in unidirectional and radial flow Configurations: Method and Application","authors":"Zhechao Wang, Kanglin Li, Tian Zheng, Jie Liu","doi":"10.1016/j.tust.2025.106634","DOIUrl":"10.1016/j.tust.2025.106634","url":null,"abstract":"<div><div>Groundwater flow configurations typically include unidirectional and radial flow and the flow field in rock mass are usually influenced by the flow configuration obviously. In this study, a calculation equation of radial flow permeability coefficient tensor was proposed, based on the calculation method of unidirectional flow permeability coefficient tensor and the correlation between rectangular and cylindrical coordinate systems. A correlation between unidirectional and radial flow permeability coefficient was established based on Darcy’s law, the equivalent permeability coefficient equation under radial flow, and the correlation of equivalent hydraulic aperture between unidirectional and radial flow. The core for the correlation was the relation of hydraulic apertures in terms of the fracture roughnesses in the two flow configurations. For an underground water-sealed storage cavern, the permeability coefficients of different flow configurations in the engineering zone were determined, and the numerical simulation of water inflow was carried out. The results indicated that the permeability coefficient of unidirectional flow was greater than that of radial flow. Water inflow with permeability coefficient partition assignment based on the flow configuration was higher than that with entire radial flow permeability coefficient. In addition, a calculation method of the water inflow into cavern considering permeability coefficient partition was established and verified by the numerical simulation.</div></div>","PeriodicalId":49414,"journal":{"name":"Tunnelling and Underground Space Technology","volume":"162 ","pages":"Article 106634"},"PeriodicalIF":6.7,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143807088","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}

引用次数: 0