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    Relative efficacy of CPT- versus Vs-based simplified liquefaction evaluation procedures (2017)

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    Conference Contributions - Published
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    http://hdl.handle.net/10092/17290
    
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    • Engineering: Conference Contributions [2338]
    Authors
    Bradley, Brendon cc
    Green RA
    Upadhyaya S
    Wood CM
    Maurer BW
    Cox BR
    Wotherspoon LM
    Cubrinovski M
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    Abstract

    The focus of the study presented herein is an assessment of the relative efficacy of recent Cone Penetration Test (CPT) and small strain shear wave velocity (Vs) based variants of the simplified procedure. Towards this end Receiver Operating Characteristic (ROC) analyses were performed on the CPT- and Vs-based procedures using the field case history databases from which the respective procedures were developed. The ROC analyses show that Factors of Safety (FS) against liquefaction computed using the most recent Vs-based simplified procedure is better able to separate the “liquefaction” from the “no liquefaction” case histories in the Vs liquefaction database than the CPT-based procedure is able to separate the “liquefaction” from the “no liquefaction” case histories in the CPT liquefaction database. However, this finding somewhat contradicts the assessed predictive capabilities of the CPT- and Vs-based procedures as quantified using select, high quality liquefaction case histories from the 20102011 Canterbury, New Zealand, Earthquake Sequence (CES), wherein the CPT-based procedure was found to yield more accurate predictions. The dichotomy of these findings may result from the fact that different liquefaction field case history databases were used in the respective ROC analyses for Vs and CPT, while the same case histories were used to evaluate both the CPT- and Vs-based procedures.

    Keywords
    liquefaction; simplified procedure; earthquake
    ANZSRC Fields of Research
    40 - Engineering::4005 - Civil engineering::400506 - Earthquake engineering

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    • Assessment of CPT-based methods for liquefaction evaluation in a liquefaction potential index (LPI) framework 

      Maurer, B.W.; Green, R.A.; Cubrinovski, M.; Bradley, Brendon (University of Canterbury. Civil and Natural Resources Engineering, 2015)
      In practice, several competing liquefaction evaluation procedures (LEPs) are used to compute factors of safety against soil liquefaction, often for use within a liquefaction potential index (LPI) framework to assess ...
    • Relative accuracy of CPT-based liquefaction evaluation procedures: Lessons learned for the 2010-2011 Canterbury earthquake sequence 

      Green, R.A.; Maurer, B.W.; Cubrinovski, M.; Bradley, Brendon (University of Canterbury. Civil and Natural Resources Engineering, 2015)
      Data from the 2010-2011 Canterbury earthquake sequence (CES) provides an unprecedented opportunity to assess and advance the current state of practice for evaluating liquefaction triggering. Towards this end, select case ...
    • Select liquefaction case histories from the 2010-2011 Canterbury earthquake sequence 

      Green, R.A.; Cubrinovski, M.; Cox, B.; Wood, C.; Wotherspoon, L.; Bradley, Brendon; Maurer, B. (University of Canterbury. Civil and Natural Resources Engineering, 2014)
      The 2010–2011 Canterbury earthquake sequence began with the 4 September 2010, Mw7.1 Darfield earthquake and includes up to ten events that induced liquefaction. Most notably, widespread liquefaction was induced by the ...
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