Effect of Specimen Size on Confined Compression Testing of Rock Cores

Abstract

An experimental study was conducted to determine the influence of specimen size on the mechanical response of rock. Specimens of Charcoal Black granite (Cold Spring, Minnesota) and Indiana Limestone (Bedford, Indiana) ranging in size from 2-in. dia. to 36-in. dia. (32-in. dia. for the granite) were tested in triaxial compression. Test data included axial and circumferential strain at up to 30 locations on the largest specimens, and axial and radial stresses. Data for loading, unloading and reloading conditions were collected. The loading data were fit to models describing bulk modulus and shear modulus, from which other moduli were determined. The reduction in strength over the size range and confining pressures employed ranged from 20 to 50 percent.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1972
Accession Number
AD0751548

Entities

People

  • Peter J. Huck

Organizations

  • IIT Research Institute

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Constitutive Equations
  • Crystal Structure
  • Instrumentation
  • Measurement
  • Mechanical Properties
  • Mechanics
  • Modulus Of Elasticity
  • Petrology
  • Plastic Explosives
  • Radial Stress
  • Shear Modulus
  • Shear Stresses
  • Standards
  • Stress Strain Relations
  • Stress Waves
  • Stresses
  • Tectosilicates

Readers

  • Geotechnical Engineering.
  • Materials Science (Mechanical Engineering).
  • ballistics.