Pulsations During Fires in Tunnels

Lönnermark, Anders; Neumann, N.

doi:10.1007/s10694-012-0263-z

Cited by 4 publications

(4 citation statements)

References 22 publications

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“…The present section reviews frequently discussed methods for calculating the critical velocity. Several articles that provide a comprehensive overview are already available [22][23][24][25][26] and they are not repeated here. The methods are based on characteristic numbers of fluid mechanics, which are briefly reviewed.…”

Section: Current Methodologymentioning

confidence: 99%

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A Mixed Convection Model for Estimating the Critical Velocity to Prevent Smoke Backlayering in Tunnels

Beyer,

Stacey,

Brenn

2024

Preprint

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A novel mathematical model for the critical ventilation velocity to prevent smoke backlayering in tunnels is presented, addressing limitations of prior approaches. The basis of the model is a rigorous characterisation of the physical processes by the characteristic quantities. Empirical parameters within the new model are determined, to align with results from both full-size and small-scale tunnel experiments. Data from numerical simulations (CFD, Computational Fluid Dynamics), validated by known test data, are then used to estimate the effects of tunnel slope and other parameters on the critical velocity. The model is seen to approximate the critical velocity well, following all trends identified by test data and CFD parameter studies. The empirically calibrated equation permits prediction of the critical velocity beyond the narrow range of tunnel geometries where known results already give an answer. The resulting equation has practical application for tunnel design.

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Section: Current Methodologymentioning

confidence: 99%

“…Some of the references noted above are summarised and discussed in Section 2. For a more detailed explanation of the different methods, reference is made to other work [22][23][24][25][26].…”

Section: 𝐾 𝑔mentioning

confidence: 99%

A Mixed Convection Model for Estimating the Critical Velocity to Prevent Smoke Backlayering in Tunnels

Beyer,

Stacey,

Brenn

2024

Preprint

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“…Limited large-scale experimental studies have been carried out on the performance of tunnel linings in fire 7,[31][32][33][34][35][36][37][38][39] including the Runehamar fire tests. 40 Nevertheless, only limited works 7,18,31,33,37,39 have been conducted on full-scale tunnel lining segments that were tested under combined structural and fire loading. These tests included real life boundary conditions, external loading, and conditioning comparable to design expectations.…”

Section: Introductionmentioning

confidence: 99%

“…Limited large‐scale experimental studies have been carried out on the performance of tunnel linings in fire 7,31–39 including the Runehamar fire tests 40 . Nevertheless, only limited works 7,18,31,33,37,39 have been conducted on full‐scale tunnel lining segments that were tested under combined structural and fire loading.…”

Section: Introductionmentioning

confidence: 99%

Effect of uniaxial loading on the spalling of concrete panels for Melbourne's Metro Tunnel Project

Guerrieri,

Lee,

Lee

et al. 2024

Structural Concrete

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The Metro Tunnel is a Victorian Government funded infrastructure project which will create a new end‐to‐end rail line from Sunbury in the west to Cranbourne/Pakenham in the south east, with bigger and better trains, next generation signaling technology and five new underground stations. This article provides a detailed summary of the structural fire testing requirements for the platform tunnel side wall and arch lining in the Metro Tunnel's State Library and Town Hall stations. Contrasted to building fires, tunnel fires are more significant within a few minutes due to the confined space which can cause concrete spalling and jeopardize the bearing capacity of the tunnel, which is a significant concern to designers. The catastrophic European tunnel fire events in 1999 and 2001 led to the development of innovative regulations and recommendations, including guidelines endorsed by the European Federation of National (EFNARC 132F r3:2006) and Efectis R0695:2020. This paper explains the methodology taken to design the fire rated concrete test for the platform tunnel side wall and arch lining in the State Library and Town Hall stations of Melbourne's Metro Tunnel Project for structural stability for the period of a serious fire event. For the first time, uniaxial loading (500T) was applied to five large‐scale flat concrete panels (1800 × 1800 × 400 mm) which are normally unloaded during fire exposure and exposed to the RABT ZTV (rail) fire curve. The first testing program investigated the influence of polypropylene dosage in the concrete mix design and its effect on the magnitude and severity of concrete spalling. The results indicated that the recommended 2.0 kg/m3 polypropylene dosage requirement as specified by Eurocode is conservative. Concrete mix designs with a stable aggregate and the correct curing regime can mitigate spalling at significantly lower polypropylene dosage rates. The water pooling effect was evident during the fire testing and the surface cracking that developed was vertical to the surface, allowing for the release of the pore water pressure build‐up.

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Study on temperature variation and pulsation frequency of diesel-wetted wood powder fire with different fuel component ratios and burner diameters

Lei

Chen

et al. 2021

Case Studies in Thermal Engineering

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Pulsations During Fires in Tunnels

Cited by 4 publications

References 22 publications

A Mixed Convection Model for Estimating the Critical Velocity to Prevent Smoke Backlayering in Tunnels

A Mixed Convection Model for Estimating the Critical Velocity to Prevent Smoke Backlayering in Tunnels

Effect of uniaxial loading on the spalling of concrete panels for Melbourne's Metro Tunnel Project

Study on temperature variation and pulsation frequency of diesel-wetted wood powder fire with different fuel component ratios and burner diameters

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