Blastingmechanismofair-deckedchargeinconcretemedium

WU Liang; LU Wen-bo; ZHONG Dong-wang; ZHU Hong-bing

doi:10.11883/1001-1455(2010)01-0058-07

Volume 30 Issue 1

May 2014

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WU Liang, LU Wen-bo, ZHONG Dong-wang, ZHU Hong-bing. Blastingmechanismofair-deckedchargeinconcretemedium[J]. Explosion And Shock Waves, 2010, 30(1): 58-64. doi: 10.11883/1001-1455(2010)01-0058-07

Citation:

WU Liang, LU Wen-bo, ZHONG Dong-wang, ZHU Hong-bing. Blastingmechanismofair-deckedchargeinconcretemedium[J]. Explosion And Shock Waves, 2010, 30(1): 58-64. doi: 10.11883/1001-1455(2010)01-0058-07

WU Liang, LU Wen-bo, ZHONG Dong-wang, ZHU Hong-bing. Blastingmechanismofair-deckedchargeinconcretemedium[J]. Explosion And Shock Waves, 2010, 30(1): 58-64. doi: 10.11883/1001-1455(2010)01-0058-07

Citation:

WU Liang, LU Wen-bo, ZHONG Dong-wang, ZHU Hong-bing. Blastingmechanismofair-deckedchargeinconcretemedium[J]. Explosion And Shock Waves, 2010, 30(1): 58-64. doi: 10.11883/1001-1455(2010)01-0058-07

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Blastingmechanismofair-deckedchargeinconcretemedium

doi: 10.11883/1001-1455(2010)01-0058-07

1.
CollegeofScience,WuhanUniversityofScienceandTechnology,
2.
Wuhan430081,Hubei,China;
3.
StateKeyLaboratoryof WaterResourceand HydropowerEngineeringScience,

Funds:

NationalNaturalScienceFoundationofChina(50774056,50779050)

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Corresponding author: WU Liang
Publish Date: 2010-01-25

Abstract

Abstract

Basedonthenon-linearfinite-elementprocedureofLS-DYNA,theJohnson-Holmquist- Cook(JHC)modelwasadoptedtoinvestigatethedamageevolutionoftheconcreteneartheblasthole inthecasesofdifferentchargingstructuresanddifferentair-deckedratios.Thecalculationresultsfor threechargingstructuresshowthatthereisagradualchangefromcompression-shearfailuretotensile failurewiththeincreaseofair-deckedratioandthatdifferentair-deckedchargingstructurescanbeappliedtodifferentblastingpurposes. Forbenchblasting,thehighestutilizationratioofexplosionenergybelongstothetopair- deckedchargingstructure.Whentheair-deckedratioreaches40%,thefailuremodeoftheconcreteelementchangesfromcompression- shearfailuretotensilefailureinthemiddleoftheblasthole. Itisindicatedthatacertainreasonableair-deckedratioexistsanditcanbeused toimprovetheutilizationratioofblastingenergy.Forpresplittingblastingandsmoothblasting,the bestblastingeffectbelongstothemiddleair-deckedchargingstructure.Detonatingmannerscanaffect benchblastingmorestronglythanpresplittingblastingandsmoothblasting.
- mechanicsofexplosion,
- failuremechanism,
- Johnson-Holmquist-Cookmodel,
- air-decked charge,
- blastloading,
- concretedamage

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