Accession Number : AD0780707

Title :   An Investigation of a Concept of Limiting the Effects of Cratering Detonations,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION LIVERMORE CALIF EXPLOSIVE EXCAVATION RESEARCH LAB

Personal Author(s) : Redpath,Bruce B.

Report Date : MAR 1974

Pagination or Media Count : 68

Abstract : Experiments were conducted to investigate a concept of limiting some adverse effects of using explosives to break rock. Specifically, it was hypothesized that a planar zone of explosively fractured rock might attenuate the stress wave generated by an explosive charge, and thereby serve to protect a structural plane, such as a presplit surface, from damage. The zone of explosively fractured rock has been designated a buffer zone. The overall concept would be to place buffer zones between structural rock surfaces and the main excavation charges. Peak particle velocities generated by 200-lb, deeply buried cratering charges were measured both with and without the presence of intervening buffer zones. The results were not conclusive as to the effectiveness of buffer zones, and improved experimental procedures may be required in further investigations. (Modified author abstract)

Descriptors :   *Detonations, *Cratering, Explosion effects, Explosive charges, Rock, Underground explosions, Test methods

Subject Categories : Explosions

Distribution Statement : APPROVED FOR PUBLIC RELEASE