Study of lined and unlined cavities in biaxially loaded rock

Isaac M Daniel, R. E. Rowlands

Research output: Contribution to conferencePaperpeer-review

Abstract

An experimental study is discussed of the state of strain, deformation and fracture around lined and unlined cylindrical cavities in rock under biaxial compressive static loading. The specimens were limestone plates 36 in. high, 24 in. wide and 3 in. thick with a 4 in. diameter hole unlined or lined with hydrostone and aluminum liners. The ratio of horizontal to vertical applied stress was one-third. Experimental techniques used were strain gages, differential transformers and photoelastic coatings. Strain distributions were plotted along the horizontal axis of symmetry for various levels of applied stress. The agreement with theory was good at low stress levels but appreciable deviations occurred at higher levels and near the hole. The experimental strain concentration factor was nearly the same, slightly higher and appreciably higher than the theoretical value for the hydrostone-lined, unlined and aluminum-lined specimens, respectively. Failure modes were splitting along a vertical plane for the unlined and hydrostone-lined specimens, compressive (shear) failure for one unlined specimen and splitting with radial cracking for the aluminum-lined specimen. In the latter, a maximum tensile stress of more than three times the uniaxial tensile strength existed at the interface with the liner at the time of fracture.

Original languageEnglish (US)
Pages877-902
Number of pages26
StatePublished - 1970
Event12th U.S. Symposium on Rock Mechanics, USRMS 1970 - Rolla, United States
Duration: Nov 16 1970Nov 18 1970

Conference

Conference12th U.S. Symposium on Rock Mechanics, USRMS 1970
Country/TerritoryUnited States
CityRolla
Period11/16/7011/18/70

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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