Influence of Stationary Vehicles on Backlayering Characteristics of Fire Plume in a Large Cross Section Tunnel

Kunikane, Yuko; Kawabata, Nobuyoshi; Yamada, Takaaki; Shimoda, Akifumi

doi:10.1299/jsmeb.49.594

Cited by 11 publications

(6 citation statements)

References 4 publications

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“…Hence, it is crucial to clarify the effect of stranded vehicles on the backlayering length. There have been some studies on the impact of vehicular blockage on the backlayering length [14][15][16][17][18][19][20][21]. In these studies investigating the effect of obstacles on the backlayering length, there was one obstacle [17,18,20,21] or an obstacle such as a train [16,19].…”

Section: Introductionmentioning

confidence: 99%

Scale Model Experiments and Simulations to Investigate the Effect of Vehicular Blockage on Backlayering Length in Tunnel Fire

Kawabata

Seike

et al. 2022

Buildings

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This study used model experiments and numerical simulations to investigate the backlayering length of a vehicle-blocked tunnel fire. The experimental setup included two types of obstacles (low obstacles and high obstacles), as well as three configurations: no obstacles, one side with a car obstacle, and two sides with a car obstacle. If there were vehicles on one side of a lane, it would have little effect on the elongation of the backlayer length. When there were vehicles on both sides of a lane, the elongation of the backlayer length was greatly reduced. In addition, the effects of the vehicular blockage ratio and blockage configuration on the properties of the backlayering length were investigated. We created Pattern A, where fire is was in the center, and Pattern B, where fire was on the side of the tunnel. In Pattern A, almost all obstacles could be approximated using the formula. When the vehicle blockage ratio of a single lane was small, an approximation formula for Pattern B was applicable. However, if the distance between stationary vehicles on the upstream side of the fire source was small, the backlayering length could have been longer than in the case with no vehicular blockage.

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Section: Introductionmentioning

confidence: 99%

Scale Model Experiments and Simulations to Investigate the Effect of Vehicular Blockage on Backlayering Length in Tunnel Fire

Kawabata

Seike

et al. 2022

Buildings

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“…Thomas ［ 10 ］ studied the fire conditions of the tunnel under vertical ventilation conditions, and finally obtained the theoretical equation of the hot flue gas return upstream of the fire source. Kunikane et al [11] . conducted a numerical simulation of the length of the return flow of smoke from a stationary vehicle in a tunnel.…”

Section: Introductionmentioning

confidence: 99%

The Prediction Model of Influence of Small Radius UTLT Curvature on Fire Site Visibility Based on Pyrosim Multiple Regression Analysis

Yao

Dai³

et al. 2019

E3S Web Conf.

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As a modern city’s “fourth dimension space”, UTLT is a typical narrow and confined underground space. Due to the special structural position and the curvature of the tunnel, the hot smoke in the fire field can easily form a “smoke turning circle” phenomenon, which greatly reduces environmental visibility and threatens people escape quickly. This article takes a UTLT small radius tunnel as an example to investigate the relationship between the curvature of the tunnel and the visibility of the fire near the fire source. Firstly, using Pyrosim to simulate the change of visibility in different curvatures of fire field, and using SPSS to carry out multiple regression analysis on numerical simulation data, summarizing the prediction model of the impact of small radius UTLT tunnel curvature on the visibility near the fire source. Finally, regression model analysis and test show that the curvature is negatively correlated with the visibility of the tunnel and the prediction model is feasible. The research results can provide theoretical guidance for the design of UTLT-type small-radius circulation smoke evacuation and rapid evacuation of personnel, and provide a reference for similar curve tunnel curvature design and smoke control measures.

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“…Therefore, designing the support structures, selecting the excavation methods and studying the stability of the surrounding rock of super-span tunnels are widely considered by scholars. A series of researches have been carried out in the field of super-span tunnels [7][8][9]. Some achievements have been made in the design of supporting structures.…”

Section: Introductionmentioning

confidence: 99%

Field Monitoring of the Deformation and Internal Forces of the Surrounding Rock and Support Structures in the Construction of a Super-Span High-Speed Railway Tunnel—A Case Study

et al. 2020

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A super-span tunnel that has the characteristics of a large excavation area, a small high-span ratio and a significant spatial effect exhibits a complex mechanical response during the excavation process. In this paper, taking the Badaling Great Wall station in Beijing, China as the engineering background, a case study of field monitoring a super-span tunnel has been presented. A typical monitoring section was selected in the super-span transition section of the tunnel and the deformation and forces of both the surrounding rock and the support structures were systematically monitored. The dynamic evolution and the spatial distribution characteristics of the monitoring data, including the internal displacement of the surrounding rock, the tunnel displacement, the contact pressure between the surrounding rock and the primary supports, the contact pressure between the primary and secondary supports, the axial forces in the bolts and cables, the internal forces in both the steel arches and the secondary supports and the internal stresses of the surrounding rock, were analyzed. The results of the monitoring and the analyses have shown that the deformation and the forces acting on both the surrounding rock and the tunnel’s lining are directly related to the construction procedures, the geological conditions and the locations in the super-span tunnel. According to the results, a few suggestions to improve the construction of the tunnel have been proposed.

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Influence of Stationary Vehicles on Backlayering Characteristics of Fire Plume in a Large Cross Section Tunnel

Cited by 11 publications

References 4 publications

Scale Model Experiments and Simulations to Investigate the Effect of Vehicular Blockage on Backlayering Length in Tunnel Fire

Scale Model Experiments and Simulations to Investigate the Effect of Vehicular Blockage on Backlayering Length in Tunnel Fire

The Prediction Model of Influence of Small Radius UTLT Curvature on Fire Site Visibility Based on Pyrosim Multiple Regression Analysis

Field Monitoring of the Deformation and Internal Forces of the Surrounding Rock and Support Structures in the Construction of a Super-Span High-Speed Railway Tunnel—A Case Study

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