Numerical study on effects of air leakages from abandoned galleries on hill-side coal fires

Song, Zeyang; Zhu, Huangqiu; Tan, Bo; Wang, Haiyan; Qin, Xizhong

doi:10.1016/j.firesaf.2014.08.011

Cited by 80 publications

(11 citation statements)

References 43 publications

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“…mining operations expose formerly covered coal volumes to outside air. Coal fires are a complicated phenomenon, which is defined by a complex of interplay of geophysical, thermal, hydraulic, chemical, and mechanical processes (Ide et al, 2010;Song et al, 2014b;Wessling, 2007;Wessling et al, 2008;Wolf and Bruining, 2007;Wuttke et al, 2010;Xia et al, 2014). Furthermore, coal fires are a catastrophe occurring all around the world (Kuenzer and Stracher, 2012;Sinha and Singh, 2008;Stracher, 2004;Stracher and Taylor, 2004).…”

mentioning

confidence: 99%

Analysis of coal fire dynamics in the Wuda syncline impacted by fire-fighting activities based on in-situ observations and Landsat-8 remote sensing data

Song

Kuenzer

Zhu

et al. 2015

International Journal of Coal Geology

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mentioning

confidence: 99%

Analysis of coal fire dynamics in the Wuda syncline impacted by fire-fighting activities based on in-situ observations and Landsat-8 remote sensing data

Song

Kuenzer

Zhu

et al. 2015

International Journal of Coal Geology

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“…e relationship between the permeability, density, and confining pressure can be expressed as k � 1.32 × 10 −7 + 1.10 × 10 −5 · e ((−(C/54.06))−(ρ/536.14)) , (8) where k decreased gradually with an increase in confining pressure and density when 0 ≤ C ≤ 4 MPa and 200 ≤ ρ ≤ 850 kg/m 3 . Combined with the field situation and experience, the FC permeability with a density of 250 kg/m 3 also reached 6.1 × 10 −6 m/s, which was sufficient to suppress the oxidation of residual coal by preventing air from entering the mined area.…”

Section: Permeability Experiments Of Foam Cementmentioning

confidence: 99%

“…us, many cross headings were left in the gob during mining process. Building an airtight wall is thought to be a most effective way to control air leakage [7,8], that is caused by the cross headings that remain in the gob.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study and Application of a Novel Foamed Concrete to Yield Airtight Walls in Coal Mines

Wen

Fan

Zhang

et al. 2018

Advances in Materials Science and Engineering

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Airtight walls are vital to prevent spontaneous combustion of residual coal as caused by air leakage. A new type of foamed concrete (FC) was developed to control air leakage. FC specimens of four densities (250, 450, 650, and 850 kg/m 3 ) were prepared for use in a series of physical and mechanical tests. A thickener was used to control the FC shrinkage and collapse. e permeability of the FC decreased approximately exponentially with an increasing density. On the contrary, the compressive strength (σ) and elastic modulus (E) increased in exponential and linear relationship separately with the increase in density, under uniaxial compression conditions. Under triaxial compression, the compressive strength of the FC increased with an increase in confining pressure and appeared slight plastic. e impact experiment showed that the dynamic compressive strength of the FC appeared to be strain-rate dependent, and it increased with an increase in the strain rate and pressure under a confining pressure. Without a confining pressure, the variation in compressive strength exhibited a slow decrease. Applied FC resulted in a 5 MPa 28-day compressive strength of the airtight wall with no remaining fissures and with air leakage suppression to the gob.

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“…However, there are complicated areas, such as the gob, where it is impossible to access and know the real conditions in detail [17], as some of the coal parameters are difficult to define when modeling software is used, such as the chemical reaction of coal [18,19] or the effect of moisture [20], while safety issues related to the gob area are multiple, from ventilation to geomechanics, among others [21]. Airflow leakages from the drifts to the gob are especially important in the initiation of fires in this area [22].…”

Section: Introductionmentioning

confidence: 99%

Determination and Fire Analysis of Gob Characteristics Using CFD

et al. 2020

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A laboratory-scale analysis using coal from an underground mine was carried out, emulating a mixture from the gob area in an actual mine, consisting of waste, coal, and free space for the flow of air. Experimental tests and computational fluid dynamics modelling were done to define and verify the behavior of the collapsed region in a time-dependent analysis. In addition, the characteristics of coal were defined, regarding the self-combustion, combustion rate, and pollutants generated in each stage of the fire. The results achieved are useful for determining the behavior of the collapsed area in full-scale conditions and to provide valuable information to study different scenarios of a potential fire in a real sublevel coal mine regarding how the heat is spread in the gob and how pollutants are generated.

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Numerical study on effects of air leakages from abandoned galleries on hill-side coal fires

Cited by 80 publications

References 43 publications

Analysis of coal fire dynamics in the Wuda syncline impacted by fire-fighting activities based on in-situ observations and Landsat-8 remote sensing data

Analysis of coal fire dynamics in the Wuda syncline impacted by fire-fighting activities based on in-situ observations and Landsat-8 remote sensing data

Experimental Study and Application of a Novel Foamed Concrete to Yield Airtight Walls in Coal Mines

Determination and Fire Analysis of Gob Characteristics Using CFD

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