True triaxial tests in two porous sandstones: Experimental failure characteristics and theoretical prediction

X. Ma, J. W. Rudnicki, B. C. Haimson

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations

Abstract

True triaxial tests have been carried out in two quartz-rich, high porosity, sandstones, Coconino (n = 17.5%) and Bentheim (n = 24%) by maintaining constant but different σ2 and σ3 and raising σ1 until failure occurred (at σ1,peak). For each constant σ3 level, σ2 was varied from test to test between σ2 - σ3 and σ2 = σ1, σ1,peak for a given σ3 increased with σ2, reached a maximum (up to 15% higher than when σ2 = σ3), and then declined so that when σ1 approached σ1, σ1,peak was about equal to its base value when σ2 = σ3. A separate series of tests was carried out using a novel loading path by maintaining constant Lode angle θ (= 0°). This series of tests characterized the dependence of the octahedral shear stress at failure τoct,f on the octahedral normal stress at failure σoct,f when θ = 0°. The latter tests were used to obtain the necessary parameters employed in a three-invariant failure theory proposed by Rudnicki (2013). The theory was then applied to predicting the variation of σ1,peak with σ2 for a given σ3. The prediction reasonably replicated the typical ascending-then-descending σ1,peak vs. σ2 trend observed experimentally in both sandstones, confirming (with some limitations) the applicability of the Rudnicki's (2013) theory.

Original languageEnglish (US)
Title of host publication48th US Rock Mechanics / Geomechanics Symposium 2014
EditorsRay Sterling, Emmanuel Detournay, Will Pettitt, Joseph F. Labuz, Lee Petersen
PublisherAmerican Rock Mechanics Association (ARMA)
Pages208-213
Number of pages6
ISBN (Electronic)9781634395236
StatePublished - 2014
Event48th US Rock Mechanics / Geomechanics Symposium 2014: Rock Mechanics Across Length and Time Scales - Minneapolis, United States
Duration: Jun 1 2014Jun 4 2014

Publication series

Name48th US Rock Mechanics / Geomechanics Symposium 2014
Volume1

Conference

Conference48th US Rock Mechanics / Geomechanics Symposium 2014: Rock Mechanics Across Length and Time Scales
Country/TerritoryUnited States
CityMinneapolis
Period6/1/146/4/14

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

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