A computational study on effects of fire location on smoke movement in a road tunnel

Feng, Wang; Wang, Mingnian

doi:10.1016/j.tust.2015.09.008

Cited by 66 publications

(18 citation statements)

References 16 publications

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“…Figure 7 shows the length of smoke counterflow under different ambient pressures when the HRR is small. We can deduce that equation (28) fits well with results from numerical simulations and Li's model 20 also applies in predicting the length of counterflow under reduced ambient pressures. Table 3 shows the counterflow length of 5 MW under different ambient pressures from FDS.…”

Section: Small Heat Release Ratesupporting

confidence: 73%

“…Equation (28) takes air density into consideration which is closely related to ambient pressure and the difference caused by the air density is given by equation (30)…”

Section: Small Heat Release Ratementioning

confidence: 99%

“…Zhong et al 27 found out that maximum smoke temperature under the tunnel ceiling would increase exponentially when fire source moved from centreline to sidewall and so did the critical velocity since critical ventilation velocity is closely related to the gas temperature at the impinging area. Wang et al 28 studied the back-layering length and critical velocity in a longitudinal ventilated tunnel with varying fire locations and found that the critical velocity could be higher when fire was near the wall. These studies would apply to cases where the fire flame does not touch the tunnel ceiling.…”

Section: Introductionmentioning

confidence: 99%

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Effects of ambient pressure on the critical velocity and back-layering length in longitudinal ventilated tunnel fire

Yan

Wang

et al. 2019

Indoor and Built Environment

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Nowadays, the critical velocity and back-layering length are the key parameters in longitudinal ventilation design. However, most studies research them at standard air pressure but ambient pressure decreases at high-altitude area and the reduced ambient pressure could affect the smoke movement characteristics in a tunnel fire. In order to investigate the effect of ambient pressure on the velocity and back-layering length in longitudinal ventilated tunnel, theoretical analysis was carried out first and a series of numerical simulation were conducted with varying heat release rate and ambient pressure. Results show that Li’s model is also reliable under various ambient pressures. The critical velocity under various ambient pressures would become larger with an increase in the heat release rate and would remain stable after the heat release rate reaches a certain value. At smaller heat release rate, the length of counterflow would be higher under reduced ambient pressure while it remains the same when the HRR is large. This could provide reference for tunnel ventilation design at high-altitude areas.

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Section: Small Heat Release Ratesupporting

confidence: 73%

“…Equation (28) takes air density into consideration which is closely related to ambient pressure and the difference caused by the air density is given by equation (30)…”

Section: Small Heat Release Ratementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of ambient pressure on the critical velocity and back-layering length in longitudinal ventilated tunnel fire

Yan

Wang

et al. 2019

Indoor and Built Environment

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“…With the development of transportation and economy, it is inevitable to build long large tunnels in deep underground space [1][2][3][4][5]. At present, the maximum depth of the civil tunnel has exceeded 2500 m. The increasing number of long, large and deep buried tunnels has brought great challenges to the construction and operation of projects [6][7][8][9][10][11][12]. However, rockburst is a common problem in the construction of deep tunnels, which occurred widely in Australia [13], Canada [14], South Africa [15,16], China [17][18][19] and other countries [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

The Prevention and Control Mechanism of Rockburst Hazards and Its Application in the Construction of a Deeply Buried Tunnel

et al. 2019

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Rockburst hazards induced by high geostress are particularly prominent during the construction of underground engineering. Prevention and control of rockburst is still a global challenge in the field of geotechnical engineering, which is of great significance. Based on the tunnel group of the Jinping II hydropower station of China, this paper analyzed the mechanical principle of support in the process of construction, and discussed in detail the active release and passive support by numerical simulation and field application. The results show that as two active measures, stress relieve holes and advanced stress relief blasting can release the energy of the microseismic source and transfer the high stress to the deeper surrounding rock, make the surface rock wall with a relatively low stress act as a protective barrier. Their stress release rate is about 12% and 33% in this project, respectively. In term of passive measure, the combined rapid support, which is mainly composed of water swelling anchor and nano-admixture shotcrete, is also an effective way to prevent and control the rockburst under high geostress.

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“…Recently, extensive studies on transverse fires in a tunnel have further been reported through full-scale tests, model-scale experiments and numerical simulation. Much concern concentrated on effects of transverse fires on the maximum temperature, smoke movement, flame characteristics, air entrainment, and burning rate [32][33][34][35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the smoke temperature distribution alongside the lining in tunnel fires

Wang

Huang

et al. 2019

Therm sci

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Tunnel fire temperature is a key factor for tunnel structural safety and evacuation. This study aimed to investigate the smoke temperature distribution alongside the lining across the section and effects of pool sizes and fuels on it through a series of small-scale experiments. The results showed the heat release rates of diesel were significantly lower than gasoline's when they had the same pool size and volume. Nevertheless, the duration of diesel combustion increased obviously. As a result, the maximum smoke temperature under the ceiling for gasoline was significantly higher than diesel's. The results were subsequently adopted to compare with other test results and illustrated a similar result. The initial temperature rising rates for gasoline pool fires were shown to agree well with the standardized temperature curves, but they were significantly lower for diesel pool fires. Two exponential correlations on vertical temperature distribution were provided, respectively, for gasoline and diesel fires. These findings are expected to be useful for the design of the thermal boundary on the lining in tunnel fires.

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A computational study on effects of fire location on smoke movement in a road tunnel

Cited by 66 publications

References 16 publications

Effects of ambient pressure on the critical velocity and back-layering length in longitudinal ventilated tunnel fire

Effects of ambient pressure on the critical velocity and back-layering length in longitudinal ventilated tunnel fire

The Prevention and Control Mechanism of Rockburst Hazards and Its Application in the Construction of a Deeply Buried Tunnel

Experimental study on the smoke temperature distribution alongside the lining in tunnel fires

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