4ThermochemicalparametersofexplosiveThe volume of gas products under the standard state by theSpecificexplosionperkilogramexplosive(unit:L/kg)。Thelargespecificvolumevolume ofastingmeansthelargeworkingcapacityofexplosive.The released heat by the explosion per kilogram explosive (unitExplosionheatJ/kg orkJ/kg).The solidexplosive changes intogas products intheexplosioninstant,andtheproductsdon'texpand until theend of explosionTherefore,theexplosion canbeconsideredtoa constantvolumeprocess.ExplosionThemaximumtemperature of explosionproducts reachbecauseof thetemperatureexplosionenergyThefluid staticpressure valuewhentheexplosionproductsreachExplosiontheirthermal balance inthe initial volume afterthe explosionpressureExplosionpressureisalsodefinedastheinstantpressure onthewall of boreholeattheexplosion endtime ofexplosive,soitisalsocalledasboreholepressure.172016/11/9
2016/11/9 17 4 Thermochemical parameters of explosive Explosion pressure Explosion temperature Explosion heat Specific volume of blasting The volume of gas products under the standard state by the explosion per kilogram explosive(unit: L/kg)。 The large specific volume means the large working capacity of explosive. The released heat by the explosion per kilogram explosive (unit: J/kg or kJ/kg ). The solid explosive changes into gas products in the explosion instant, and the products don’t expand until the end of explosion. Therefore, the explosion can be considered to a constant volume process. The maximum temperature of explosion products reach because of the explosion energy The fluid static pressure value when the explosion products reach their thermal balance in the initial volume after the explosion. Explosion pressure is also defined as the instant pressure on the wall of borehole at the explosion end time of explosive, so it is also called as borehole pressure
5 Explosive SensitivitysensitivityTheexplosionabilityof explosiveto external powersensitivity to initiationsensitivityto flamesensitivitytoshockwavesensitivity tofrictionsensitivityelectrostaticsensitivitysensitivity toimpactsensitivity to heatOther sensitivityThe explosive sensitivities varies to the different external power forms.Therefore,it is not reasonable to measure its sensitivityto certain initiationpowerwithoneto anotherinitiationpower.182016/11/9
2016/11/9 18 5 Explosive Sensitivity sensitivity The explosion ability of explosive to external power sensiti vity The explosive sensitivities varies to the different external power forms. Therefore, it is not reasonable to measure its sensitivity to certain initiation power with one to another initiation power. Other sensitivity sensitivity to initiation sensitivity to shock wave electrostatic sensitivity sensitivity to flame sensitivity to friction sensitivity to impact sensitivity to heat
Sensitivity toHeat and MechanicalSensitivitymeans the explosive ability to heatSensitivit-y to heatsensitivity to heatis usually expressedbytheignitionpoint.the heat mainly includes two ways:the uniform heatingand thepilot offlame.MechanicalSensitivity(1) sensitivitythe explosive ability to impactto impact(2)sensitivitythe explosive ability to frictionto friction192016/11/9第一章炸药爆炸基本理论
2016/11/9 第一章 炸药爆炸基本理论 19 Sensitivity to Heat and Mechanical Sensitivity Sensitivity to heat means the explosive ability to heat sensitivity to heat is usually expressed by the ignition point. the heat mainly includes two ways： the uniform heating and the pilot of flame. Mechanical Sensitivity （1）sensitivity to impact （2）sensitivity to friction the explosive ability to impact the explosive ability to friction
Explosive sensitivity toinitiationsensitivityto initiationexplosive sensitivity to initiation means the detonation abilityof high explosivetotheexplosionof otherexplosive(primaryexplosive,primerandsoon)The explosivewithcapsensitivity means that can be initiatedeliablybyNo.8blastingcapinonetimeThe explosive with cap insensitivity means that cannot be initiatedreliablybyNo.8blastingcapinonetime.202016/11/9
2016/11/9 20 Explosive sensitivity to initiation sensitivity to initiation explosive sensitivity to initiation means the detonation ability of high explosive to the explosion of other explosive (primary explosive, primer and so on). The explosive with cap sensitivity means that can be initiated reliablyby No. 8 blasting cap in one time. The explosive with cap insensitivity means that cannot be initiated reliablyby No. 8 blasting cap in one time
Sympathetic Detonation of ExplosiveSympathetic detonationmeansthephenomenonsympatheticthat the explosion ofexplosive(donor cartridge)detonationinduces the explosion ofadjacentexplosive (receptorcharge) .Transmissiondistancemeansthemaximumdistancetransmissionbetween the two charges that the donor cartridge candistanceinitiatethe receptorcharge100%.Theflash-overcapabilityofexplosiveis expressedbythetransmissiondistance,andthe unitis cm.Objectiveofstudying Sympathetic Detonation(1) Fordetermining the safetydistanceamong theproductionrooms,and supplyingbasicdataforworkshopdesign,(2)Forimprovingthepropertiesofindustrial explosive,andthereliabilityof initiationortransmission in engineering blasting212016/11/9
2016/11/9 21 Sympathetic Detonation of Explosive sympathetic detonation Sympathetic detonation means the phenomenon that the explosion of explosive (donor cartridge ) induces the explosion of adjacent explosive (receptor charge) . Transmission distance means the maximum distance between the two charges that the donor cartridge can initiate the receptor charge 100%. transmission distance The flash-over capability of explosive is expressed by the transmission distance, and the unit is cm. (1) For determining the safety distance among the production rooms, and supplying basic data for workshop design; (2) For improving the properties of industrial explosive, and the reliability of initiation or transmission in engineering blasting. Objective of studying Sympathetic Detonation