Seismic Determination of Geological Discontinuities Ahead of Rapid Excavation

Abstract

The need for the on-site knowledge of large geological discontinuities ahead of rapid excavation is very desirable for avoiding hazardous or difficult formations ahead of excavation surfaces and for expediting the rate of excavation. The objective of this program is to study the feasibility of using ultrasonic acoustic signals and seismic impulses to rapidly predict the presence of large geological discontinuities or other potential sources of danger, such as old mine workings filled with water or gas, lying within a reasonable working range (a few feet to a few tens-of-feet) ahead of excavation surfaces. The principal geologic medium of interest is 'hard' or crystalline rock.

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Document Details

Document Type
Technical Report
Publication Date
Nov 30, 1971
Accession Number
AD0736692

Entities

People

  • Charles F. Johnson
  • R. R. Gupta

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Propagation
  • Ceramic Materials
  • Impedance
  • Materials Processing
  • Measurement
  • Piezoelectric Crystals
  • Piezoelectric Materials
  • Piezoelectric Transducers
  • Radiation
  • Rapid Excavation
  • Resonant Frequency
  • Scattering
  • Sound Waves
  • Standing Waves
  • Surface Roughness
  • Vibration
  • Wave Propagation

Fields of Study

  • Geology

Readers

  • Acoustical Oceanography.
  • Environmental Remediation and Restoration.
  • Geotechnical Engineering.