Know the topic " Blasting of tunnel " with basic approach considering its consequences Definations of Blasting in tunnel Blasting in tunnel : Discharging operation of a explosive to loosen rock Blasting Powder=Salt petre + Sulphur + Charcoal Safety Fuse : Use to convey a flame to explosive .It contin black powder. Electric Squib : To ignite blasting powder Prima Cord : Very high explosive detonating fuse whose core is contained in the water proof with considerable tensile strength. Used to detonate dynamite @ velocity of 6000m/sec Coyoto Tunnel : Tunnel of several metre diameter into which a large quantity of explosive placed for detonating purposes Stemming : Process of adding inert material such as mud or rock dust in bore hole Primer :It is mainly used to initiate explosion. Types of Explosive used in blasting in tunnel 1) Powder Explosive 2) Liquid air Explosive 3) Disruptive Explosive Grade and strength in form of cartridges of 2.5cm to 20cm in diameter and 2
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