The drill and blast method in tunnelling involves drilling a series of holes in a precise pattern, then filling them with explosives to break and remove rock. The design of the drill and blast pattern is crucial, as it determines the effectiveness and safety of the operation. It factors in rock type, tunnel size, and desired fragmentation. Proper sequencing and timing of blasts are essential to minimise vibration, control overbreak, and maintain the tunnel's structural integrity. Follow us at tu

12 reactions | Coal Mine Collapse In Jharkhand: At least three people are feared dead and several others trapped after an illegal coal mine collapsed near Jharkhand’s Dhanbad. What caused the collapse? #CoalMine #Jharkhand #CoalMineCollapse #CoalMineCollapsed | Indian Express | Facebook