Question

The nearest building is 1200 ft from site and Ds= 55. Change the type of rock to diorite.

a. Determine burden distance and spacing of the blast holes.

b. What is the largest total weight of explosives that can be simultaneously detonated based on the vibration/safety distance criteria.

12.8 A project in shale will have an average bench height of 21 ft. ANFO specifie gravity 0,90, will be the explosive used on the project. Dynamite, specifie gravity 1.3, will be the primer explosive used. The es in 10-in.-long 1-in.-diameter sticks. The contractor's equipment can easily drill 34-in. -diameter holes. It is assumed that single rows of no more than 10 holes will be detonated The holes will be lined. The thickness of the lining material is in. To ease the fieldwork all design dimensions should be in integer numbers (f). Calculate an appropriate burden distance for the blast design.

Answer 1

he burden dt tom ee trom table -for shale 3 tab SCr- 2.6 Q.6 -. Jhe approprtate barden d tatance tor

he Yoctf.cdtortte. 오, 9