A new mechanistic model for prediction of instantaneous coal outbursts - Dedicated to the memory of Prof. Daniel D. Joseph

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Abstract

An instantaneous coal outburst is a sudden and violent simultaneous ejection of large amounts of coal and gas (methane, carbon dioxide) from the working coalface during underground mining. The occurrence of such an outburst usually leads to a gas explosion and pollution of the mine. Despite extensive research efforts in the past 150. years, the physical mechanisms causing coal outbursts are still poorly understood. Here we present a new model combining fracture mechanics, gas dynamics and rock mechanics to elucidate the physical mechanisms leading to instantaneous outbursts. This model suggests a domino effect that leads to a catastrophic failure of the coal and an instantaneous outburst. The model identifies a critical condition for the onset of instantaneous outbursts, and it successfully predicts all of the observed phenomena preceding outbursts, most of which are explained for the first time. The model also predicts a fracture aperture size effect which is confirmed by the existing observation-based fracture classification scheme used to assess outburst proneness.

Original languageEnglish (US)
Pages (from-to)72-79
Number of pages8
JournalInternational Journal of Coal Geology
Volume87
Issue number2
DOIs
StatePublished - Aug 1 2011

Fingerprint

outburst
Coal
coal
Data storage equipment
prediction
Rock mechanics
Gas dynamics
Gases
Fracture mechanics
Explosions
Carbon dioxide
Methane
Pollution
gas
fracture aperture
fracture mechanics
size effect
rock mechanics
explosion
carbon dioxide

Keywords

  • Catastrophic failure
  • Choked flow
  • Coal outburst
  • Fractured zone
  • Unbounded pressure gradient

ASJC Scopus subject areas

  • Economic Geology
  • Geology
  • Stratigraphy
  • Fuel Technology

Cite this

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title = "A new mechanistic model for prediction of instantaneous coal outbursts - Dedicated to the memory of Prof. Daniel D. Joseph",
abstract = "An instantaneous coal outburst is a sudden and violent simultaneous ejection of large amounts of coal and gas (methane, carbon dioxide) from the working coalface during underground mining. The occurrence of such an outburst usually leads to a gas explosion and pollution of the mine. Despite extensive research efforts in the past 150. years, the physical mechanisms causing coal outbursts are still poorly understood. Here we present a new model combining fracture mechanics, gas dynamics and rock mechanics to elucidate the physical mechanisms leading to instantaneous outbursts. This model suggests a domino effect that leads to a catastrophic failure of the coal and an instantaneous outburst. The model identifies a critical condition for the onset of instantaneous outbursts, and it successfully predicts all of the observed phenomena preceding outbursts, most of which are explained for the first time. The model also predicts a fracture aperture size effect which is confirmed by the existing observation-based fracture classification scheme used to assess outburst proneness.",
keywords = "Catastrophic failure, Choked flow, Coal outburst, Fractured zone, Unbounded pressure gradient",
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AU - Chen, Kangping

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N2 - An instantaneous coal outburst is a sudden and violent simultaneous ejection of large amounts of coal and gas (methane, carbon dioxide) from the working coalface during underground mining. The occurrence of such an outburst usually leads to a gas explosion and pollution of the mine. Despite extensive research efforts in the past 150. years, the physical mechanisms causing coal outbursts are still poorly understood. Here we present a new model combining fracture mechanics, gas dynamics and rock mechanics to elucidate the physical mechanisms leading to instantaneous outbursts. This model suggests a domino effect that leads to a catastrophic failure of the coal and an instantaneous outburst. The model identifies a critical condition for the onset of instantaneous outbursts, and it successfully predicts all of the observed phenomena preceding outbursts, most of which are explained for the first time. The model also predicts a fracture aperture size effect which is confirmed by the existing observation-based fracture classification scheme used to assess outburst proneness.

AB - An instantaneous coal outburst is a sudden and violent simultaneous ejection of large amounts of coal and gas (methane, carbon dioxide) from the working coalface during underground mining. The occurrence of such an outburst usually leads to a gas explosion and pollution of the mine. Despite extensive research efforts in the past 150. years, the physical mechanisms causing coal outbursts are still poorly understood. Here we present a new model combining fracture mechanics, gas dynamics and rock mechanics to elucidate the physical mechanisms leading to instantaneous outbursts. This model suggests a domino effect that leads to a catastrophic failure of the coal and an instantaneous outburst. The model identifies a critical condition for the onset of instantaneous outbursts, and it successfully predicts all of the observed phenomena preceding outbursts, most of which are explained for the first time. The model also predicts a fracture aperture size effect which is confirmed by the existing observation-based fracture classification scheme used to assess outburst proneness.

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