Engineering College

2. 6 A project in slate will have an average bench height of 27 ft. An emulsion with a relative bulk strength of 119, specific gravity 0. 90, will be the explosive used on the project. Dynamite sticks 10 in. Long having a specific gravity of 1. 3 and a diameter exactly equal to the D. Of the emulsion will be used as a detonator. The contractor's equipment can easily drill 4-in. -diameter holes. It is assumed that single rows of no more than 10 holes will be detonated instantaneously. The excavation site has structures within 1,600 TL The local regulatory agency specifies a scaled distance factor of no, less than 55. Develop a blast design for the project. Round design, dimensions to the nearest foot. 12. 7 the blasting in problem 12. 6 must be conducted so as to limit overbreakage. Develop a presplitting blast plan

Answers

Answer 1

The spacing is given as 22.5

How to solve for the spacing

Burden distance = [2 x 0.9 / 2.65 + 1.5] x 4

= Burden distance is given as 9 ft

The stiffness ratio is 27 / 9

= 3

T depth = 6 ft

J depth = 3 ft

Spacing  S = 27 + 2 x9 / 3

= 15 ft

Actual spacing =

15 ± 1.15

= 13.85 , 16.25

c olumn length = 27 + 3 - 6

= 24

explosive per blast hole

= 24 x 4.9

= 117 . 6

(2 x 1/4)² / 28

= 0.180

27 x 0.18 + 3 x 0.18

= 5.4

Spacing = 10 x 2.25

= 22.5

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