Determination of In-Situ Stresses Around Underground Excavations by Means of Hydraulic Fracturing

Abstract

Laboratory tests have been conducted to determine the mechanical properties of Coeur d'Alene quartzite and to establish whether this highly inhomogeneous, precracked variable rock is suitable for hydraulic fracturing as a method of in-situ stress measurement. It was found that basically the Coeur d'Alene quartzite is amenable to hydraulic fracturing testing. The rock has no consistent anisotropy, but is inhomogeneous with physical property variations depending on fabric changes and existence of fractures and mica inclusions. Hydrofracture direction is always perpendicular to the smallest horizontal stress notwithstanding rock condition. Field stress measurements in the Coeur d'Alene mines using the hydraulic fracturing technique are recommended.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1974
Accession Number
AD0780220

Entities

People

  • Bezalel C. Haimson

Organizations

  • University of Wisconsin–Madison

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Anisotropy
  • Axial Loads
  • Compressive Strength
  • Elastic Properties
  • Engineering
  • Laboratory Tests
  • Measurement
  • Mechanical Properties
  • Mechanics
  • Modulus Of Elasticity
  • Physical Properties
  • Pore Pressure
  • Rock Mechanics
  • Strain Gages
  • Stress Strain Relations
  • Stresses
  • Tensile Strength

Readers

  • Explosive Engineering.
  • Materials Science (Mechanical Engineering).
  • Oceanography.