Feasibility of Use of Simple Models to Test Explosive Cratering of Roads on Slopes in Rock.
Abstract
Cratering charges were detonated in unstemmed shafts drilled in test beds fabricated of bricks, in order to explore whether such beds might offer a simple approximate way to model the cratering behavior of jointed rock. In two beds where bricks were close-packed but not cemented, rubble mounds rather than apparent craters were formed. The beds appeared to be so permeable that the pressure of the explosion gases was rapidly dissipated and much of the gases' energy was effectively wasted. In cemented beds on level ground, smaller apparent craters resulted than were predicted from published cratering curves for dry rock. In a cemented bed on a hillside, much more damage and material movement occurred than for a comparable bed on level ground. The small apparent craters produced may have been caused in part by the vertical joints in the beds, which may have induced vertical trajectories of ejecta particles. Excavated true craters in cemented beds were square-shaped with flat floors, conforming to previously published descriptions of true craters in horizontally bedded, vertically jointed rock.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1979
- Accession Number
- ADA079600
Entities
People
- Colin C. Mcaneny