Dynamicstressinadjacentcoalseamsinduced

bydeep-holeblastinginrock

GONG Min; WANG Hua; WEN Bin

doi:10.11883/1001-1455(2012)02-0196-07

Volume 32 Issue 2

May 2014

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GONG Min, WANG Hua, WEN Bin. Dynamicstressinadjacentcoalseamsinducedbydeep-holeblastinginrock[J]. Explosion And Shock Waves, 2012, 32(2): 196-202. doi: 10.11883/1001-1455(2012)02-0196-07

Citation:

GONG Min, WANG Hua, WEN Bin. Dynamicstressinadjacentcoalseamsinduced bydeep-holeblastinginrock[J]. Explosion And Shock Waves, 2012, 32(2): 196-202. doi: 10.11883/1001-1455(2012)02-0196-07

GONG Min, WANG Hua, WEN Bin. Dynamicstressinadjacentcoalseamsinducedbydeep-holeblastinginrock[J]. Explosion And Shock Waves, 2012, 32(2): 196-202. doi: 10.11883/1001-1455(2012)02-0196-07

Citation:

GONG Min, WANG Hua, WEN Bin. Dynamicstressinadjacentcoalseamsinduced bydeep-holeblastinginrock[J]. Explosion And Shock Waves, 2012, 32(2): 196-202. doi: 10.11883/1001-1455(2012)02-0196-07

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Dynamicstressinadjacentcoalseamsinduced bydeep-holeblastinginrock

doi: 10.11883/1001-1455(2012)02-0196-07

1.
CivilandEnvironmentalEngineeringInstitute,UniversityofScienceandTechnologyBeijing,

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Corresponding author: GONG Min
Publish Date: 2012-03-25

Abstract

Abstract

Toovercomethedifficultyinusingthedeep-holepre-splittingblastingtechnologyinthesoft coalseamspronetoresultingintheboreholecollapse,anewmethodwasappliedtoincreasingthegas drainagerate,inwhichtherocknearbythecoalseamwasexplodedatthebottomofthelaneway.The theoriesforthetechniquewereexploredbynumericalsimulation.Layoutsofblastholesanddrain holeswerecomparedthesinglecoalseam andthecoal-rock media.Fivenumericalcomputational modelswereconstructedbyDYNA3D,includingasinglecoalmodelandfourcoal-rockmodelswith thedifferentdistancebetweentheblastholeandthedrainhole.Thecorrespondingeffectivestress wascomputedalongthelinkinglineoftheblastholeandthedrainhole.Thecomputationalresults showthattheattenuationoftheeffectivestressfromtheblastholetothedrainholeismoreinthe coal-rockmediathaninthesinglecoal,whereastheeffectivestressdifferencebetweenthetwomedia decreasesinthecoalseamsadjacenttothedrainholes.Thedistributionoftheeffectivestressalong theaxisofthedrainholeissignificanttothedraineffect.Themeaneffectivestressalongtheaxisof thedrainholeincoal-rock media,whenthedistancebetweentheblastholeandthedrainholeis 2.0m,isappropriatelythesameasthatinthesinglecoalseam,whenthedistancebetweentheblast holeandthedrainholeis3.0m.Anditcanbeusedasthelayoutparametertokeepthesameblast effectinthecoal-rockmediaasinthesinglecoalseam.
- mechanicsofexplosion,
- dynamicstress,
- computationalmodel,
- coalseam,
- rock,
- blasting