A New Detonating Cord for Reducing Unwanted Damage in Controlled Blasting

摘要

The present state of technology in Controlled Blasting uses standard explosives' products to create a crack between holes along a desired line of break. The resulting pre-split, post-shear or cut line is often of variable quality with unwanted damage at right angles to the desired cut line. A new concept in Detonating Cord manufacturing has provided a radically different performing explosive. This new Cord has reduced the velocity of Detonation by more than a third. It changes the Detonation Pressure profile of Detonating Cord to a lower and longer sustained pressure pulse. In addition, it develops more gas than conventional cords. At the same time it maintains all of the handling and reliability advantages ofconventional Detonating Cord. Through detailed in-hole pressure measurements of damage to polished slabs, we have been able to document the difference in performance. Actual pressure curves and crack statistics will be used to prove the performance of the cord. It is shown that the Low Velocity Cord does reduce damage perpendicular to the cut line while maintaining the quality of that cut line.