Lecture _13-Drilling & Blasting Rock

Lecture - Blasting Rock Blast design Powder factor Vibration Trench rock Presplitting Production Mowbrays N Adams Adams plant Figure 12.3 Face

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Blasting Rock CJS 1 ± Blast design ± Powder factor Mowbray’s NAdam s ± Vibration ± Trench rock ± Presplitting ± Production N. Adams plant. Face Bench height Burden distance Figure 12.3 Spacing Blasthole depth Stemming Subdrilling Figure 12.3
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Blasting Rock CJS 2 ± Rock breakage results from gas pressure in the blasthole. ± Radial cracking ± Individual wedge Individual wedges ± Flexural rupture ± Stiffness ratio bench height burden distance Burden distance is the most critical dimension in blast design It is the distance to the free face of the excavation. blast design. Burden distance is the most critical dimension in blast design. It is the distance to the free face of the excavation. ANFO is an explosive used extensively on construction projects. Texas City, 16 April 1947
Background image of page 2
Blasting Rock CJS 3 The blast should be designed with a Stiffness designed with a Stiffness Ratio of 3 or greater . Note SR relationships listed in TABLE 13.4 .
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/07/2012 for the course CM 335 taught by Professor Staff during the Fall '08 term at BYU.

Page1 / 9

Lecture - Blasting Rock Blast design Powder factor Vibration Trench rock Presplitting Production Mowbrays N Adams Adams plant Figure 12.3 Face

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online