7 results for Cubrinovski, M., Conference poster

  • Strong ground motions observed in the 22 February 2011 Christchurch earthquake

    Bradley, B.A.; Cubrinovski, M. (2011)

    Conference poster
    University of Canterbury Library

    Poster listed as B-055

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  • The Undrained Cyclic Response of Monterey Sand in Direct Simple Shear

    Cappellaro, C.; Cubrinovski, M.; Bray, J.D.; Stringer, M.E.; Riemer, M.F.; Chiaro, G. (2016)

    Conference poster
    University of Canterbury Library

    In 2010 and 2011 a series of earthquakes hit the central region of Canterbury, New Zealand, triggering widespread and damaging liquefaction in the area of Christchurch. Liquefaction occurred in natural clean sand deposits, but also in silty (fines-containing) sand deposits of fluvial origin. Comprehensive research efforts have been subsequently undertaken to identify key factors that influenced liquefaction triggering and severity of its manifestation. This research aims at evaluating the effects of fines content, fabric and layered structure on the cyclic undrained response of silty soils from Christchurch using Direct Simple Shear (DSS) tests. This poster outlines preliminary calibration and verification DSS tests performed on a clean sand to ensure reliability of testing procedures before these are applied to Christchurch soils.

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  • What new liquefaction can teach us about old earthquakes: Evaluating the efficacy of paleoliquefaction analytics using modern analogs

    Maurer, B.W.; Green, R.A.; Bradley, B.A.; Cubrinovski, M. (2014)

    Conference poster
    University of Canterbury Library

    Paleoliquefaction back-analyses can be very accurate if earthquake source location & mechanism are known. Accurate analysis is more difficult if source location is unknown, but index Ef enables more intelligent estimate of causative earthquake’s location and magnitude. Framework using site-specific geotechnical analysis shown to be effective and proposed for use in paleoliquefaction studies worldwide.

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  • Evaluation of Liquefaction Potential Index (LPI) for Assessing Liquefaction Hazard: A Case Study in Christchurch, New Zealand

    Maurer, B.; Green, R.; Cubrinovski, M.; Bradley, B.A. (2013)

    Conference poster
    University of Canterbury Library

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  • Evaluation of Liquefaction Potential of Pumiceous Deposits Through Field Testing

    Orense, R.P.; Wotherspoon, L.M.; Pender, M.J.; van Ballegooy, S.; Cubrinovski, M. (2016)

    Conference poster
    University of Canterbury Library

    Pumice materials are frequently encountered in many engineering projects in New Zealand. Because of their lightweight, highly crushable and compressible nature, they are problematic from an engineering and construction viewpoint. However, there is very little information on the liquefaction characteristics of pumice deposits and most empirical procedures available for evaluating the liquefaction potential of sands are derived from hard-grained (quartz) sands.

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  • Sensitivity of predicted liquefaction-induced lateral displacements from the 2010 Darfield and 2011 Christchurch earthquakes

    Robinson, K.; Cubrinovski, M.; Bradley, B.A. (2013)

    Conference poster
    University of Canterbury Library

    Liquefaction-induced lateral spreading in Christchurch and surrounding suburbs during the recent Canterbury Earthquake Sequence (2010-2011) caused significant damage to structures and lifelines located in close proximity to streams and rivers. Simplified methods used in current engineering practice for predicting lateral ground displacements exhibit a high degree of epistemic uncertainty, but provide ‘order of magnitude’ estimates to appraise the hazard. We wish to compare model predictions to field measurements in order to assess the model’s capabilities and limitations with respect to Christchurch conditions. The analysis presented focuses on the widely-used empirical model of Youd et al. (2002), developed based on multi-linear regression (MLR) of case history data from lateral spreading occurrence in Japan and the US. Two issues arising from the application of this model to Christchurch were considered: • Small data set of Standard Penetration Test (SPT) and soil gradation indices (fines content FC, and mean grain size, D50) required for input. We attempt to use widely available CPT data with site specific correlations to FC and D50. • Uncertainty associated with the model input parameters and their influence on predicted displacements. This has been investigated for a specific location through a sensitivity analysis.

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  • Shallow shear wave velocity characterization of the urban Christchurch, New Zealand region

    McGann, C.R.; Bradley, B.A.; Cubrinovski, M. (2014)

    Conference poster
    University of Canterbury Library

    This poster provides a summary of the development of a 3D shallow (z 15,000 logs as of 01/01/2014). In particular, the 3D model provides shear wave velocities for the surficial Springston Formation, Christchurch Formation, and Riccarton gravel layers which generally comprise the upper 40m in the Christchurch urban area. Point-estimates are provided on a 200m-by- 200m grid from which interpolation to other locations can be performed. This model has applications for future site characterization and numerical modeling efforts via maps of timeaveraged Vs over specific depths (e.g. Vs30, Vs10) and via the identification of typical Vs profiles for different regions and soil behaviour types within Christchurch. In addition, the Vs model can be used to constrain the near-surface velocities for the 3D seismic velocity model of the Canterbury basin (Lee et al. 2014) currently being developed for the purpose of broadband ground motion simulation.

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