Studies in Rock Fracture

Abstract

In July, 1970, a major effort was directed toward the measurement of the in situ state of strain (stress) at an outcrop of Mesa Verde sandstone (Cretaceous), Site No. 1, on the N 45 degrees W plunging nose of the Rangely Anticline, western Colorado. With exception of a few of the photoelastic determinations, all measurements were made within a circle with a radius of about 2 m and within the same joint-bounded block. In addition, a specimen of the sandstone was studied in the laboratory by materials testing, optical, and X-ray diffraction techniques. Results for the strain-relief measurements are expressed as stresses by using a value of 50,000 bars 800,000 psi for Young's Modulus. Compressive stresses are counted positive.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Nov 15, 1970
Accession Number
AD0717278

Entities

People

  • John Handin

Organizations

  • Texas A&M University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Diffraction
  • Geological Surveys
  • Materials
  • Materials Testing
  • Measurement
  • Mechanics
  • Modulus Of Elasticity
  • Orientation (Direction)
  • Residual Stress
  • Rock Mechanics
  • Strain Rate
  • Stress Strain Relations
  • Surface Energy
  • Tectosilicates
  • Three Dimensional
  • X Rays
  • X-Ray Diffraction

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Seismology

Technology Areas

  • Autonomy