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    Global vs local strain measurements in triaxial tests – Implications

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    ARMA-2019-1717.pdf
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    Type
    Conference Paper
    Authors
    Perbawa, Andika cc
    Gramajo, E.
    Finkbeiner, Thomas cc
    Santamarina, Carlos cc
    KAUST Department
    Ali I. Al-Naimi Petroleum Engineering Research Center (ANPERC)
    Earth Science and Engineering Program
    Energy Resources and Petroleum Engineering
    Energy Resources and Petroleum Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2019
    Permanent link to this record
    http://hdl.handle.net/10754/662801
    
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    Abstract
    Accurate stress-strain measurements in triaxial compression tests are critical to derive correct values of stiffness, Poisson’s ratio, and the Biot α-parameter. Yet, inherent biases can produce unrepresentative rock properties. This study investigates the impact of different measurements using strain gauges and LVDTs. A detailed analysis reveals the impact of surface compliance at the interfaces between the specimen and end caps. Tested materials include: standard aluminum, Eagle Ford shale, Berea sandstone, and Jubaila carbonate. Results reveal: 1) Contact deformation adds non-linear behavior to the stress-strain response. 2) Seating effects lower the stiffness computed from cap-to-cap deformation measurements. 3) Strain gauges do not show hysteresis evident in cap-to-cap LVDT systems. 4) Bending due to uneven surfaces and misalignment affect cap-to-cap deformation measurements. 5) Confining pressures improve the contact at the interface and reduce partial slippage. 6) Mounting strain gauges on sleeves is ill-advised. 7) The dynamic modulus is higher than the static modulus. 8) The static and dynamic moduli are sensitive to the imposed axial deviatoric stresses. 9) The estimation of the Biot α-parameter is affected by seating effects. We conclude that specimen–bonded strain gauges are preferred to minimize and possibly avoid any of the above effects for pre-peak strain measurements.
    Sponsors
    Support provided by The KAUST Endowment at King Abdullah University of Science and Technology for this research. Gabrielle E. Abelskamp edited the manuscript.
    Publisher
    American Rock Mechanics Association (ARMA)
    Conference/Event name
    53rd U.S. Rock Mechanics/Geomechanics Symposium
    Additional Links
    https://www.onepetro.org/conference-paper/ARMA-2019-1717
    Collections
    Conference Papers; Energy Resources and Petroleum Engineering Program; Ali I. Al-Naimi Petroleum Engineering Research Center (ANPERC); Physical Science and Engineering (PSE) Division; Earth Science and Engineering Program

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