Explosion mechanism analysis during tunnel construction in the Zengwen Reservoir

Li, Ping Jung; Chen, Chao Shi; Chang, Hue Pei; Ho, Hsin-Hsiu; Xie, Bin

doi:10.1016/j.tust.2019.103279

Cited by 6 publications

(3 citation statements)

References 17 publications

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“…FLACS is the industry standard for CFD explosion simulation, which can accurately predict the consequences of accidents. , During the FLACS solution process, the gas deflagration is set as the heating and expansion of an ideal gas, and the gas dynamics can be represented by a series of equations such as the continuity equation, the momentum equation, and the energy equation. The basic equations included in the mathematical model are: continuity equation, momentum equation, energy equation, turbulent kinetic energy equation, turbulent kinetic energy dissipation rate equation, fuel composition equation, and mixture composition equation, and the unified form of the mathematical model is as shown in eq () , where φ is a general variable representing the velocity components u , v , and w , turbulent kinetic energy k , the rate of turbulent kinetic energy ε , enthalpy h , flammable gas mass fraction Y n , etc.…”

Section: Settings Of Experimental Conditions and Simulation Boundary ...mentioning

confidence: 99%

Experimental and Numerical Study of Natural Gas Leakage and Explosion Characteristics

Cai

Liu

et al. 2022

ACS Omega

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Frequent occurrence of indoor natural gas explosion accidents seriously threatens the safety of people and property. To determine the law of indoor natural gas leakage and explosion hazards, based on experiment and simulation, the nature of natural gas explosion, the distribution law of natural gas volume fraction, flame propagation, temperature, and shock wave overpressure were studied. The results show that the flame structure can be divided into three zones, i.e., preheat zone, reaction zone, and product zone. OH + CO ⇔ H + CO 2 is the main exothermic reaction in the combustion process. The overall distribution law of natural gas volume fraction shows that the higher the position, the greater the volume fraction, and the closer the distance to the leak source at the same height, the greater the volume fraction, and the natural gas volume fraction of the hose falling off is the largest under different leakage conditions. The difference in the wrapping structure of the kitchen package has a significant impact on the diffusion distribution of natural gas. The flame development goes through five stages of ignition, slow burning, detonation, slow burning, and extinguishing. The indoor temperature reaches about 1400 °C. Although the simulated value of shock wave overpressure is larger than the experimental value, the relationship between overpressure and distance is expressed by Y = A + B * ln( X + C ). This study can provide certain technical support for natural gas accident rescue. The research can provide certain technical support for natural gas accident rescue and can also be used for accident investigation to form the determination procedure and method of leakage location and leakage amount.

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Section: Settings Of Experimental Conditions and Simulation Boundary ...mentioning

confidence: 99%

Experimental and Numerical Study of Natural Gas Leakage and Explosion Characteristics

Cai

Liu

et al. 2022

ACS Omega

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“…According to a related study, fires on construction sites are mainly caused by the transfer of sparks to the surrounding insulation during welding [10,11]. In addition, various gases are stored on the site depending on the type of construction, which can increase the risk of fire and explosion on the construction site [12]. The location and method of storing combustible materials in construction sites was determined to be an important factor that can prevent fire accidents [13].…”

Section: Construction Site Fire Safetymentioning

confidence: 99%

Analysis of Fire Accident Factors on Construction Sites Using Web Crawling and Deep Learning Approach

et al. 2021

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Fire safety on construction sites has been rarely studied because fire accidents have a lower occurrence compared to construction’s “Fatal Four”. Despite the lower occurrence, construction fire accidents tend to have a larger severity of impact. This study aims at using news media data and big data analysis techniques to identify patterns and factors related to fire accidents on construction sites. News reports on various construction accidents covered by news media were first collected through web crawling. Then, the authors identified the level of media exposure for various keywords related to construction accidents and analyzed the similarities between them. The results show that the level of media exposure for fire accidents on construction sites is much higher than for fall accidents, which suggests that fire accidents may have a greater impact on the surroundings than other accidents. It was found that the main causes of fire accidents on construction sites are violations of fire safety regulations and the absence of inspections, which could be sufficiently prevented. This study contributes to the body of knowledge by exploring factors related to fire safety on construction sites and their interrelationships as well as providing evidence that the fire type should be emphasized in safety-related regulations and codes on construction sites.

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“…Based on the above, and combined with the typical urban gas explosion incidents [18][19][20][21] over the latest years, a range of finite element analyses are performed on a typical and representative gas compartment in a utility tunnel to research the propagation rule of the gas blast. A new methodology is presented to forecast the blast wave properties in the gas compartment [22,23].…”

Section: Introductionmentioning

confidence: 99%

The Study on the Shock Wave Propagation Rule of a Gas Explosion in a Gas Compartment

Lin

Hou

Derlatka

et al. 2022

Shock and Vibration

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Combined with the k-ε turbulence model of general application, a refined finite element model of a utility tunnel’s gas compartment filled with the methane/air mixture is developed. A series of analyses are made by using the powerful industry-leading computational fluid dynamics (CFD) software flame acceleration simulator (FLACS) to study the shock wave propagation rule in the gas compartment. The longitudinal and transversal distribution laws of the explosion shock wave are gained taking into consideration the spatial characteristics of the gas compartment. The influences of a few parameters, such as initial conditions and section size of the gas compartment, on the shock wave propagation rule are further discussed. The basic procedure for predicting the peak pressure of the blast wave is provided by considering the initial conditions and the gas compartment, and the corresponding injury effect of the explosion wave on the living beings is assessed. The investigation demonstrates that the peak pressure by the coupled effect between the initial conditions is significantly influenced, especially at the upper and lower gas explosion limits. The peak pressure increases gradually as the width or height increases, and both basically meet the linear relation. The proposed method can forecast the peak pressure of the explosion shock wave in the gas compartment accurately. According to the peak pressure longitudinal and transversal distributions of the blast wave, the peak pressure is far greater than the killing pressure threshold in the underground and closed space; consequently, it is not safe for the living beings in the gas compartment.

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Explosion mechanism analysis during tunnel construction in the Zengwen Reservoir

Cited by 6 publications

References 17 publications

Experimental and Numerical Study of Natural Gas Leakage and Explosion Characteristics

Experimental and Numerical Study of Natural Gas Leakage and Explosion Characteristics

Analysis of Fire Accident Factors on Construction Sites Using Web Crawling and Deep Learning Approach

The Study on the Shock Wave Propagation Rule of a Gas Explosion in a Gas Compartment

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