Article
Construction & Building Technology
Qiulin Liu, Zhisheng Xu, Chuangang Fan, Xiaochun Zhang, Jiaming Zhao, Houlin Ying, Haowen Tao
Summary: This study investigated air entrainment caused by a sideways smoke exhaust system using full-scale and model-scale tests. A shear flow phenomenon was observed downstream of the exhaust vent, which was more intense with higher exhaust velocity, destroying smoke layer stratification and increasing air entrainment. Plug-holing and shear flow intensified air entrainment, and the relationship between air entrainment, Froude number, and exhaust vent size was established. The study also found a positive relationship between heat exhaust coefficient and air entrainment, and presented the functional relationship between them for different exhaust vent sizes. Additionally, a model was developed to describe the centerline temperature distribution in lateral smoke exhaust systems.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Thermodynamics
Pai Xu, Daiqiang Zhu, Rongjun Xing, Chuanyong Wen, Shuping Jiang, Linjie Li
Summary: In this paper, theoretical models are established and FDS is used to evaluate the heat and smoke exhaust efficiency of tunnel smoke extraction systems. It is found that the larger the exhaust volume, the higher the total heat and smoke exhaust efficiency of the system, but there is also a phenomenon of plug-holing at the smoke inlets.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Sihui Dong, Kang Wang, Chenxu Jia
Summary: The special emergency plan for subway fires in China stipulates the methods of smoke exhaust during a fire. Through studying the influence of rail top smoke exhaust and tunnel smoke exhaust on subway fire smoke control, it is found that the rail top smoke exhaust mode has the best smoke exhaust effect. Therefore, it is recommended to use rail top smoke exhaust during a train fire in a subway station.
Article
Construction & Building Technology
Qiulin Liu, Zhisheng Xu, Sohail Mahmood, Baochao Xie
Summary: This study investigated the air leakage of a ceiling-centralized smoke exhaust system through full-scale tests and theoretical analysis based on the Jiangxinzhou Yangtze River Tunnel. The theoretical analysis established a functional relationship between the pressure of the exhaust vent and air leakage volume, defining the exhaust vent air leakage coefficient. By considering multiple factors, such as exhaust flue area, hydraulic diameter, resistance coefficient along the exhaust flue, and exhaust vent spacing, the study established the exhaust flue air leakage coefficient. The study also developed calculation methods for the applicable limit length and air leakage of the ceiling centralized smoke exhaust system through full-scale tests and theoretical analysis.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Thermodynamics
Yuyang Ming, Guoqing Zhu, Yuhang Zhou, Xin Liu, Xinyu Wang, Guangyuan Wang, Jinhu Ding
Summary: This study proposes a prediction model for the design and management of lateral centralized smoke exhaust systems in inclined tunnels. The findings indicate that temperature and smoke velocity show exponential decay with varying slopes, and exhaust efficiency and entrainment coefficient change accordingly. The calculated values of the model agree well with the simulated results.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Construction & Building Technology
Zhiyong Wang, Jie Ji, Tiantian Tan, Zihe Gao, Yang Zhou, Fan Zhou
Summary: This study analyzed the phenomenon of plug-holing in tunnel fires caused by lateral mechanical smoke exhaust. The results showed that as the exhaust rate increased, plug-holing occurred, resulting in decreased smoke exhaust efficiency. It was found that increasing the exhaust rate could reduce the smoke layer thickness, but had limited effect on reducing the smoke temperature in the tunnel.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2022)
Article
Ecology
Qiulin Liu, Zhisheng Xu, Weikun Xu, Sylvain Marcial Sakepa Tagne, Haowen Tao, Jiaming Zhao, Houlin Ying
Summary: In this research, the impact of tunnel width and the transverse fire's position on the heat exhaust coefficient in tunnel fires is analyzed. The results show that increasing the tunnel width leads to a decrease in temperature and heat exhaust coefficient, while increasing the distance between the exhaust vent and the fire source increases the proportion of hot smoke and consequently raises the heat exhaust coefficient.
Article
Thermodynamics
Salman Khalid, Zhiyong Wang, Yuanlong Zhou, Jie Ji
Summary: This paper investigates the smoke extraction efficiency of multiple lateral vents system in immersed tunnel fires using large eddy simulations. The study shows that the vent spacing distance has a negligible impact on the smoke extraction efficiency, while the smoke extraction efficiency increases with dimensionless heat release rate and vent aspect ratio, but decreases with increasing dimensionless lateral extraction velocity. A correlation for smoke extraction efficiency in one-dimensional smoke spread stage is established, which can provide guidance for designing ventilation system in tunnels with lateral vents.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Jiaming Zhao, Zhisheng Xu, Houlin Ying, Xueqi Guan, Kunkun Chu, Sylvain Marcial Sakepa Tagne, Haowen Tao
Summary: This study analyzed the temperature, velocity field, and visibility changes in subway carriages during fires using the fire dynamics simulator (FDS). The results showed that the distribution pattern of ceiling temperature and velocity field remains the same for different subway carriages fires. These findings support the formulation of operational safety management regulations and guidelines for long-distance intervals.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Engineering, Civil
Tiantian Tan, Longxing Yu, Long Ding, Zihe Gao, Jie Ji
Summary: This paper analyzed the impact of ambient pressure on the efficiency of mechanical smoke extraction systems in tunnel fires. The simulation revealed that there is a critical exhaust rate where excessive fresh air entrainment can be avoided. The thickness and velocity of the thermal smoke layer in the tunnel increase as the ambient pressure decreases, affecting the occurrence of the plug-holing phenomenon and increasing the critical exhaust rate.
FIRE SAFETY JOURNAL
(2021)
Article
Engineering, Civil
Jun Jin, Xuepeng Jiang
Summary: Experiments and numerical simulations were conducted to study flow stratification in lateral smoke exhaust mode. The characteristics of smoke layer interface, thickness, temperature, and shear velocity were analyzed. The stratification behavior could be classified into three regimes, and it was influenced by buoyancy, inertia force, and suction force. In region I (Frs<2.4), the stratification was stable with a clear interface. In region II (2.4<4.8), the stratification was stable, but the interface was unstable. In region III (Frs>4.8), the stratification became unstable with intense mixing and no clear interface.
FIRE SAFETY JOURNAL
(2023)
Article
Construction & Building Technology
Zhan Wang, Wenhui Deng, Min Zhou, Zheng Fang, Yuxi Guan, Zhi Tang
Summary: The study examines the smoke and heat exhaust performance of natural venting system with different shaft forms through theoretical analysis and numerical simulations. The results indicate that a smaller length-width ratio of the shaft vent leads to higher smoke and heat exhaust efficiencies, and cylindrical shafts have higher efficiencies compared to cubic ones.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2023)
Article
Thermodynamics
Zhengyang Wang, Xuepeng Jiang, Haejun Park, Lujia Wang, Jie Wang
Summary: This study used computer simulations of tunnel fires to investigate the impact of heat release rate and tunnel's cross-sectional dimensions on smoke flow, proposing an improved correlation for the demarcation point location.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Ecology
Ying Li, Fang Huang, Chuyuan Ma, Kaixuan Tang
Summary: This study analyzed the effect of different smoke exhaust patterns and longitudinal air supply volumes on smoke control in an ultra-wide tunnel fire. The results show that increasing the air supply volume can shorten the smoke spread distance. The top exhaust pattern is more effective in controlling smoke spread and maintaining a safe smoke layer height. It also has a higher exhaust efficiency compared to the sidewall exhaust pattern.
Article
Thermodynamics
Jie Li, Yanhua Zeng, Liangliang Tao, Zhenhan Liu, Baojun Li
Summary: This paper investigates the longitudinal temperature distribution characteristics and smoke control of a tunnel using a combination of multi-point smoke exhaust and longitudinal ventilation. The experiments show that this method can effectively control flame offset and smoke emission, but the longitudinal wind speed needs to be controlled within a certain range.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Engineering, Chemical
Zhi Sheng Xu, Wenjiao You, Jie Kong, Huan Huan Cao, Cai Zhou
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2017)
Article
Thermodynamics
Long Yan, Zhisheng Xu, Jun Zhang
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2017)
Article
Chemistry, Applied
Long Yan, Zhisheng Xu, Xinghua Wang
PROGRESS IN ORGANIC COATINGS
(2017)
Article
Chemistry, Applied
Long Yan, Zhisheng Xu, Xinghua Wang, Nan Deng, Zhiyong Chu
JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH
(2018)
Article
Construction & Building Technology
Baochao Xie, Jing Hou, Zhisheng Xu, Mingjie Dan
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
(2018)
Article
Construction & Building Technology
Baochao Xie, Jing Hou, Zhisheng Xu, Mingjie Dan
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
(2018)
Article
Thermodynamics
Zhisheng Xu, Zhiyong Chu, Long Yan
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2018)
Article
Chemistry, Applied
Long Yan, Zhisheng Xu, Xinghua Wang
PROGRESS IN ORGANIC COATINGS
(2018)
Article
Construction & Building Technology
Lu He, Zhisheng Xu, Hongguang Chen, Qiulin Liu, Yixiao Wang, Yang Zhou
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2018)
Article
Polymer Science
Zhisheng Xu, Nan Deng, Long Yan, Zhiyong Chu
POLYMERS FOR ADVANCED TECHNOLOGIES
(2018)
Article
Thermodynamics
Yang Zhou, Rongwei Bu, Junhui Gong, Zhongyang Geng, Huiai Fu, Liang Yi
COMBUSTION SCIENCE AND TECHNOLOGY
(2019)
Article
Construction & Building Technology
Yang Zhou, Yang Yang, Zhanli Mao, Rongwei Bu, Junhui Gong, Yixiao Wang, Liang Yi
SUSTAINABLE CITIES AND SOCIETY
(2019)
Article
Thermodynamics
Liang Yi, Xudu Wang, Rongwei Bu, Shutao Zhang, Yang Zhou
Summary: This study proposed a mathematical model to predict the temperature distribution inside concrete pavement under the action of pool fire, and a series of experiments were conducted to validate the prediction results. The heat transfer process and heat dissipation process were analyzed in detail, and the established mathematical model was implemented by MATLAB programming.
COMBUSTION SCIENCE AND TECHNOLOGY
(2021)
Article
Construction & Building Technology
Liang Yi, Xiaofei Wang, Yang Yang, Yixiao Wang, Yang Zhou
SUSTAINABLE CITIES AND SOCIETY
(2020)
Article
Thermodynamics
Zhisheng Xu, Hongguang Chen, Lu He, Jiaming Zhao, Qiulin Liu, Baochao Xie
CASE STUDIES IN THERMAL ENGINEERING
(2018)
Article
Construction & Building Technology
Zhi Ding, Xiao Zhang, Shao-Heng He, Yong-Jie Qi, Cun-Gang Lin
Summary: This study investigates the longitudinal behavior of a shield tunnel by designing and constructing a reduced-size indoor model. The results show that the longitudinal settlement of the tunnel follows a normal distribution, with the maximum settlement occurring at the central ring and increasing linearly with the applied load. Stress concentration typically occurs on the side of the tunnel waist under surcharge, resulting in transverse elliptical deformation of the entire structure.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Lucia Lopez-de-Abajo, Marcos G. Alberti, Jaime C. Galvez
Summary: Assessing and predicting concrete damage is crucial for infrastructure management. This study quantifies gas concentrations in urban tunnels to achieve this goal.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Chao He, Yinghao Cai, Chenqiang Pu, Shunhua Zhou, Honggui Di, Xiaohui Zhang
Summary: This paper investigates the impact of river channel excavation on adjacent metro tunnels and proposes protective measures based on an engineering project in Fuzhou, China. A three-dimensional finite element model is developed to calculate the displacements and distortion of tunnels under different excavation sequences and soil reinforcement measures. Real-time monitoring confirms that the vertical displacements and diametrical distortion of tunnels are primarily caused by the excavation of the river above the tunnels, while horizontal displacements are induced by the excavation next to the tunnels. The study recommends a combination of cement slurry with a portal form and concrete with a plate form for soil reinforcement and tunnel protection.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Yaosheng Liu, Ang Li, Feng Dai, Ruochen Jiang, Yi Liu, Rui Chen
Summary: In this study, a hybrid model based on a multilayer perceptron (MLP) and meta-heuristic algorithms was developed to improve blast performance during tunnel excavation. Precise prediction of post-blasting indicators was important for optimization, and a comparison of meta-heuristic algorithms was conducted to find the most suitable model. The results showed that the developed model effectively reduces overbreak areas and quantitatively analyzes the influence of geological conditions.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Xiang Shen, Yifan Chen, Liqiang Cao, Xiangsheng Chen, Yanbin Fu, Chengyu Hong
Summary: In this paper, a machine learning-based method for predicting the slurry pressure in shield tunnel construction is proposed. By considering the influence of fault fracture zones and setting the formation influence coefficient, the accuracy of the prediction is significantly improved.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Shuying Wang, Zihao Zhou, Xiangcou Zheng, Jiazheng Zhong, Tengyue Zheng, Changhao Qi
Summary: A real-time assessment and monitoring approach based on laser scanning technology and point cloud data analysis was proposed to address the hysteresis in assessing the workability of conditioned soils and the inefficiency in estimating the soil volume flow rate in tunnelling practice. The approach was successfully applied in identifying the workability of conditioned soil and its discharge rate in the EPB shield tunnelling project.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Peng Jiang, Benchao Liu, Yuting Tang, Zhengyu Liu, Yonghao Pang
Summary: This study introduces a novel deep learning-based electrical method that jointly inverses resistivity and chargeability to estimate water-bearing structures and water volume. Compared with traditional linear inversion methods, the proposed method demonstrates superiority in locating and delineating anomalous bodies, reducing solution multiplicity.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Haoyu Mao, Nuwen Xu, Zhong Zhou, Chun Sha, Peiwei Xiao, Biao Li
Summary: The study focuses on the delineation of rock mass damage zones and stability analysis of underground powerhouse in Lianghekou hydropower station. ESG monitoring system is used to monitor the inner micro-fracture activity of surrounding rock mass in real-time. Engineering analogy method is adopted to forecast the deformation period of surrounding rock mass and analyze the variation characteristics of seismic source parameters. The research results provide references for similar deep underground excavation engineering in terms of design and construction.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Junling Qiu, Dedi Liu, Kai Zhao, Jinxing Lai, Xiuling Wang, Zhichao Wang, Tong Liu
Summary: This study focuses on the construction surface cracks of large cross-section tunnels in loess strata of China. The mechanism of surface crack formation is analyzed, and factors such as settlement deformation, construction scheme, and surrounding soil environment are identified as the main contributors. Numerical simulations were conducted to gain a deeper understanding of the influence of factors on surface cracks in loess tunnel construction. Specific measures for prevention and treatment of construction surface cracks are proposed to provide new ideas for surface crack control in loess tunnels.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Ting Shang, Jiaxin Lu, Ying Luo, Song Wang, Zhengyu He, Aobo Wang
Summary: The study reveals significant variations in car-following behavior across different types of tunnels and consecutive sections of the same tunnel. As tunnel length increases, the driving stability of following vehicles decreases, but the level of driving safety risk is not positively correlated with tunnel length. Significant vehicle trajectory oscillation is observed within the inner sections of long and extra-long tunnels, and a significant relationship between the acceleration of following vehicles and the location within the tunnel section is found.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Rusi Zeng, Zhongwei Shen, Jun Luo
Summary: The urban underground complexes (UUCs) in China have been effective in solving urban problems, but users have expressed dissatisfaction with the internal physical environment. Personal characteristics and environmental factors play significant roles in determining users' satisfaction.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Gabriel Lehmann, Heiko Kaeling, Sebastian Hoch, Kurosch Thuro
Summary: Analysing and predicting the advance rate of a tunnel boring machine (TBM) in hard rock is important for tunnelling projects. This study focuses on small-diameter TBMs and their unique characteristics, such as insufficient geotechnical information and special machine designs. A database of 37 projects with 70 geotechnically homogeneous areas is compiled to investigate the performance of small-diameter TBMs. The analysis shows that segment lining TBMs have higher penetration rates, and new approaches for the penetration prediction of pipe jacking machines in hard rock are proposed.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Ting Ren, Ming Qiao, Jon Roberts, Jennifer Hines, Yang-Wai Chow, Wei Zong, Adrian Sugden, Mark Shepherd, Matthew Farrelly, Gareth Kennedy, Faisal Hai, Willy Susilo
Summary: Long-term exposure to coal and silica dust during underground tunnelling operations is a growing concern. To bridge the gap between knowledge in dust exposure monitoring and frontline workers, a virtual reality educational tool was developed to visualize ventilation and dust flow characteristics. This tool allows workers to better understand decision-making and best practices for dust controls.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Dong Lin, Zhipeng Zhou, Miaocheng Weng, Wout Broere, Jianqiang Cui
Summary: Metro systems play a vital role in the transportation, economic, environmental and social aspects of cities. The uncertainties in construction, passenger comfort and safety, as well as efficiency and reliability of the metro system, have been widely studied. Metro systems influence urban development and have a positive impact on housing prices, public health, and environmental quality. Further research is needed to fill the research gaps and make recommendations for future studies.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)
Article
Construction & Building Technology
Wei Yu, Bo Wang, Xin Zi, Jie Dong
Summary: In this study, a whole-process analytical theory for the coupled deformation of deep circular tunnel surrounding rock and prestressed yielding anchor bolt (cable) system is derived and validated through numerical simulations. The results show that anchor bolts (cables) can significantly reduce the convergence of surrounding rock, and factors such as support timing and anchor cable length have important effects on the support effectiveness.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2024)