Improvement in smoke extraction efficiency by natural ventilation through a board-coupled shaft during tunnel fires

Cong, Haiyong; Wang, X.S.; Zhu, Paikun; Jiang, T.H.; Shi, Xiaofeng

doi:10.1016/j.applthermaleng.2017.02.092

Cited by 65 publications

(22 citation statements)

References 16 publications

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“…FDS, developed by US National Institute of Standards and Technology, has been subjected to numerous validations, calibrations, and studies on the temperature and velocity fields in fires . There are some related fire studies on tunnel fire under natural ventilation using shafts …”

Section: Numerical Modelingmentioning

confidence: 99%

“…[47][48][49] There are some related fire studies on tunnel fire under natural ventilation using shafts. 50,51 By taking the aspect ratio of actual tunnels into account, the model tunnel in current research was specified as 100 m long, 10 m wide, and 5 m high, and the two shafts were 2 m long, 2 m wide, and 5 m high. 40,52 The extended computational regions added near the top openings of the shafts were specified as 10 m long, 6 m wide, and 10 m high.…”

Section: Numerical Modelingmentioning

confidence: 99%

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Effects of fire location on the capacity of smoke exhaust from natural ventilation shafts in urban tunnels

et al. 2018

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Summary Investigation of natural ventilation using shafts in tunnels has been receiving more attentions; however, analyses on how fire position influences the natural ventilation performance have rarely been addressed. This study investigated the influence of different fire positions between two shafts on natural ventilation effectiveness in a tunnel by large eddy simulation. The smoke movement characteristics were studied in detail, with systematically varying the fire position between two shafts and the longitudinal wind speed in the tunnel. The typical smoke characteristic parameters, such as temperature distribution, mass flow rate and CO concentration were emphatically investigated. Some special phenomena, such as plug‐holing and smoke bifurcation, were also discussed.

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Section: Numerical Modelingmentioning

confidence: 99%

Section: Numerical Modelingmentioning

confidence: 99%

Effects of fire location on the capacity of smoke exhaust from natural ventilation shafts in urban tunnels

et al. 2018

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“…Vertical ventilation shafts are passages widely used in mines and tunnels to provide fresh air underground and to remove exhaust or smoke in case of a fire [1][2][3][4]. In some extralong tunnels constructed in China, such as highway tunnels in Nibashan (10 km), Mi Cangshan (13.8 km), and Zhong Nanshan (18 km), vertical ventilation shafts were set in the middles of the alignments.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Impact of Blast‐Induced Damage on the Rock Load Supported by Liner in Construction of a Deep Shaft: A Case Study of Ventilation Shaft of Micangshan Road Tunnel Project

Fang

Yao

Walton

et al. 2020

Advances in Civil Engineering

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The rock load acting on the lining of an underground excavation is influenced by multiple factors, including rock type, rock mass condition, depth, and construction method. This study focuses on quantifying the magnitude and distribution of the radial loads on the lining of a deep shaft constructed in hard rock by the so-called short-step method. The blasting-induced damage zone (BDZ) around the shaft was characterized using ultrasonic testing and incorporated into the convergence-confinement method (CCM) and 3D numerical analyses to assess the impact of BDZ on rock loading against the liner. The results show that excavation blasting of shafts is an important controlling factor for the degradation of the rock mass, while the orientation and magnitude of the principal stress had a minimal influence on the distribution of blast-induced damage. The analysis shows that increasing the depth of blast damage in the walls can increase the loads acting on the lining, and the shear loads acting on the liner could be significant for shafts sunk by the short-step method in an area with anisotropic in situ stresses.

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“…Zhang et al investigated the plug‐holing under different fire heat release rates, fire‐shaft distances, and shaft heights in the naturally ventilated tunnel fire . Cong et al proposed a board‐coupled shaft, to investigate the distance between the board and shaft on natural ventilation during tunnel fires . Ji et al investigated the effects of cross‐sectional area and aspect ratio of shaft on natural ventilation in urban road tunnel fires …”

Section: Introductionmentioning

confidence: 99%

“…43 Cong et al proposed a board-coupled shaft, to investigate the distance between the board and shaft on natural ventilation during tunnel fires. 44 Ji et al investigated the effects of cross-sectional area and aspect ratio of shaft on natural ventilation in urban road tunnel fires. 45 Generally speaking, the fire may occur at any position of the tunnel; however, previous research has not fully revealed the detailed smoke characteristics under the influence of the relative position between shaft and fire source.…”

Section: Introductionmentioning

confidence: 99%

A numerical study on the effects of naturally ventilated shaft and fire locations in urban tunnels

Fan

Chen

Mao³

et al. 2019

Fire and Materials

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Summary In more and more tunnels, natural ventilation mode with vertical shafts has been gradually employed. However, there are few studies investigating the influences of fire and shaft positions on natural ventilation performance currently. Therefore, this study investigated the effects of the transverse distance from fire source to tunnel sidewall, the longitudinal distance from fire source to shaft, and the transverse distance from shaft to sidewall on natural ventilation effectiveness in a tunnel fire by using Fire Dynamics Simulator. The typical characteristic parameters of smoke, such as mass flow rate, temperature distribution, and velocity vector were analyzed; besides, the phenomenon of plug‐holing was discussed. The results have shown that the mass flow rate of gas exhausted by the shaft decreases slightly with the increase of longitudinal distance from fire source to shaft. When the longitudinal distance from fire source to shaft is constant, changing the transverse distance from shaft to sidewall will have a more obvious effect on the effectiveness of exhausting smoke than changing the transverse distance from fire source to sidewall; in addition, the phenomenon of plug‐holing is more serious when the shaft is close to the sidewall.

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Improvement in smoke extraction efficiency by natural ventilation through a board-coupled shaft during tunnel fires

Cited by 65 publications

References 16 publications

Effects of fire location on the capacity of smoke exhaust from natural ventilation shafts in urban tunnels

Effects of fire location on the capacity of smoke exhaust from natural ventilation shafts in urban tunnels

Evaluating the Impact of Blast‐Induced Damage on the Rock Load Supported by Liner in Construction of a Deep Shaft: A Case Study of Ventilation Shaft of Micangshan Road Tunnel Project

A numerical study on the effects of naturally ventilated shaft and fire locations in urban tunnels

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