Elastic Stress Wave Propagation in Underground Hardrock Mining.
Ligon JB; Whipple RL
For Reference Only At Bureau Libraries :218 pages
Blast-induced stress waves propagating along the surface of a drift of an underground hard-rock mine were recorded and analyzed. Resistance strain gauges, accelerometers, and a velocity pickup were used to make the measurements. Although a full face blast was recorded, the stress waves were initiated by single borehole blasts for the majority of the project. A special instrument trailer was designed, constructed, and utilized during the project. A reliable strain wave transducer was developed to measure the stress waves propagating on the drift surface. A correlation study between strain and acceleration signals for p-waves was made that agreed well with theory. The use of stemming was found to reduce strain and acceleration magnitudes as predicted.
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