Numerical investigation of coal and gas outbursts in underground collieries

Xu, Tao; Tang, Chun’an; Yang, Tianhong; Zhu, Wancheng; Liu, Jishan

doi:10.1016/j.ijrmms.2006.01.001

Cited by 181 publications

(63 citation statements)

References 15 publications

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“…who ran a series of experiments to test the probability of outburst occurrence depending on the equilibrium pressure of gas. The role of methane pressure as an indicator of the potential outburst occurrence is corroborated by numerical modelling data (Xu et al, 2006). Three methane and rock outbursts were registered in recent years in the Upper Silesia Coal Basin (Wierzbicki, Młynarczuk, 2006, Młynarczuk, Wierzbicki, 2009).…”

Section: Introductionmentioning

confidence: 69%

The Effect of Temperature on the Sorption Properties of Coal From Upper Silesian Coal Basin, Poland / Wpływ Zmian Temperatury Na Własności Sorpcyjne Na Podstawie Badań Wybranych Węgli Z Górnośląskiego Zagłębia Węglowego

Wierzbicki

2013

Archives of Mining Sciences

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This paper presents the results of studies on gas sorption performed by means of the gravimetric method. The tests were performed on two coal samples of different metamorphism degrees, came from two regions of Upper Silesian Coal Basin, Poland. The changes in sorption capacity of coals were measured in the pressure range from 0.1 MPa to 17 MPa and in temperatures ranging from 291K to 333K. Coal of a lower coalification degree was a better methane sorbent. Changes in sorption capacity of tested coals were linearly dependent on the temperature. The increase in temperature of 10K reduces the Langmuir sorption of about 0.7-0.8 [cm ). These results showed that the rise of rock temperature, caused by geothermal gradient, can induce a significant increase of equilibrium pressure of methane in coal seam. An increase of coal seam temperature may cause an increase of gas and coal outburst risk in a coal mine.

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Section: Introductionmentioning

confidence: 69%

The Effect of Temperature on the Sorption Properties of Coal From Upper Silesian Coal Basin, Poland / Wpływ Zmian Temperatury Na Własności Sorpcyjne Na Podstawie Badań Wybranych Węgli Z Górnośląskiego Zagłębia Węglowego

Wierzbicki

2013

Archives of Mining Sciences

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“…Coal is a highly heterogeneous material [43]. Its heterogeneity affects rib pillar strength [44] and also makes the coal outburst threshold more difficult to be quantified [45].…”

Section: Stress Distributions During Next Panel Retreatingmentioning

confidence: 99%

A New Gob-Side Entry Layout Method for Two-Entry Longwall Systems

et al. 2018

Energies

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Abstract:The gob-side entry layout is popular at two-entry longwall mine sites in China for the benefit of improving the coal recovery rate. Currently, two methods have been widely used to develop gob-side entries, including gob-side entry retaining and gob-side entry driving. Gob-side entry retaining maximizes the recovery rate by pillarless mining but increases the difficulty in gob-side entry support. Also, this method has limited applications in hard roof conditions. The gob-side entry driving mine site uses the rib pillar to separate the gob entry and the gob area of the previous panel, which leads to additional coal losses. The waste is more intolerable in large-cutting-height panels and longwall top coal caving panels as the Chinese government limits the minimum recovery rate of longwall panels using these mining methods. In this paper, a new gob-side entry layout method, termed gob-side pre-backfill driving, is established to overcome the shortcomings of the existing methods. The new method eliminates rib pillar losses and enhances gob-side entry stability. The feasibility of gob-side pre-backfill driving is studied by numerical modelling and a field trial at Changcun Mine in China. The results indicate that gob-side pre-backfill driving is an alternative for gob-side entry development. This method is practical and also has the potential to bring significant economic benefits to the mining industry.

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“…More details about the model can refer to the publications (Li et al 2014;Xu et al 2006Xu et al , 2012Xu et al , 2013Xu et al , 2014). …”

Section: Description Of the Modelmentioning

confidence: 99%

Mining induced strata movement and roof behavior in underground coal mine

Yang

Chen

et al. 2015

Geomech. Geophys. Geo-energ. Geo-resour.

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The fracturing and caving process of key strata in overburden strata and the distribution law of abutment stress over key strata and immediate roof are investigated and the effect of the rupture of key strata on abutment stress in coal rib and the subsidence of earth's surface are also analyzed. The simulated results show that the abutment stress over key strata and immediate roof are not uniformly distributed. The rupture of key strata has a great impact on the abutment stress in coal rib, i.e., the abutment stress is much high before the rupture of key strata and reaches to the maximum on fracturing and then decreases sharply after fracturing and the peak abutment stress moves away from working face into coal seam. In addition, the rupture of key strata has also impact on the subsidence of the earth's surface. The subsidence ratio is basically stable before fracturing and increases remarkably after fracturing and gradually becomes stable as mining.

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Numerical investigation of coal and gas outbursts in underground collieries

Cited by 181 publications

References 15 publications

The Effect of Temperature on the Sorption Properties of Coal From Upper Silesian Coal Basin, Poland / Wpływ Zmian Temperatury Na Własności Sorpcyjne Na Podstawie Badań Wybranych Węgli Z Górnośląskiego Zagłębia Węglowego

The Effect of Temperature on the Sorption Properties of Coal From Upper Silesian Coal Basin, Poland / Wpływ Zmian Temperatury Na Własności Sorpcyjne Na Podstawie Badań Wybranych Węgli Z Górnośląskiego Zagłębia Węglowego

A New Gob-Side Entry Layout Method for Two-Entry Longwall Systems

Mining induced strata movement and roof behavior in underground coal mine

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