Scaling Problems of Wave Propagation in Rocks

Abstract

Propagation of large-amplitude plane waves was studied in rock specimens from 1/2 to 12 inches thick using in-material piezoresistive stress gages. Sioux quartzite, charcoal black granite, and Coconino sandstone were examined. Good records were obtained in the granite experiments, allowing separation of the precursor from the main wave to be observed at five successive locations in a single experiment. It is concluded that time-dependent effects on wave propagation in quartzite and granite are not significant over these distances. Seven experiments in granite, with dry and water-filled open cracks, displayed the effect of the crack in erasing the precursor. The results show that the presence of a crack volume of a percent or so greatly changes the structure of the precursor. Only a few records were obtained in the sandstone experiments, and these are only partially understood.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1971
Accession Number
AD0737622

Entities

People

  • Carl F. Petersen
  • Donald R. Grine
  • William J. Murri

Organizations

  • SRI International

Tags

Communities of Interest

  • Air Platforms
  • Counter IED

DTIC Thesaurus Topics

  • Elements
  • Explosions
  • Explosive Trains
  • Explosives
  • Generators
  • Grain Size
  • High Explosives
  • Materials
  • Measurement
  • Plane Waves
  • Shock Waves
  • Stress Waves
  • Stresses
  • Tectosilicates
  • Wave Propagation
  • Waveforms
  • Waves

Readers

  • Combustion Dynamics and Shock Wave Physics.
  • Geotechnical Engineering.
  • Materials Science (Mechanical Engineering).