The Effect of Fluids and Cyclic Loading on the Elastic Constants of Rocks

Abstract

Simultaneous measurements of acoustic velocity and linear strain have been made on samples of Salem limestone and Berea sandstone. Cyclic loading conditions of 0-1-0-5-0-8-0 Kb were made on these samples. The results show that thin cracks have a large effect on acoustically measured properties and little effect on linear strain. Both rock samples are quite porous and exhibit the crushing mode of failure; at 1.5 Kb for the limestone, 5 Kb for the sandstone. This crushing greatly decreases the static modulus but changes the acoustic modulus only slightly. A peculiar knee develops in the velocity curve near the pressure of the crush-up and appears to be an indicator of it. The results suggest that volume measurements of elastic constants are to be preferred to acoustic measurements for evaluating excavation of rock.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1971
Accession Number
AD0729680

Entities

People

  • Phillip N. La Mori

Organizations

  • Battelle Memorial Institute

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms

DTIC Thesaurus Topics

  • Acoustic Propagation
  • Acoustic Velocity
  • Acoustic Waves
  • Bulk Modulus
  • Compressive Properties
  • Contracts
  • Delay Lines
  • High Pressure
  • Materials
  • Measurement
  • Mechanics
  • Porosity
  • Secondary Waves
  • Strain Gages
  • Transducers
  • Travel Time
  • Waves

Readers

  • Geotechnical Engineering.
  • Mechanical Engineering/Mechanics of Materials.