Jonathan D. Bray
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View article: Insights from liquefaction ejecta case histories for the 2010–2011 Canterbury earthquakes
Insights from liquefaction ejecta case histories for the 2010–2011 Canterbury earthquakes Open
A database of detailed liquefaction ejecta case histories for the 2010–2011 Canterbury earthquakes is interrogated. More than 50 mm of ejecta-induced settlement occurred at thick, clean sand sites shaken by PGA6.1 = 0.35–0.70 g (wherein PG…
View article: Developing software to assess the seismic risk of natural gas infrastructure: OpenSRA
Developing software to assess the seismic risk of natural gas infrastructure: OpenSRA Open
As part of a multi-year study, the Pacific Earthquake Engineering Research (PEER) center in conjunction with Lawrence Berkeley National Laboratory (LBNL), the NHERI SimCenter at Berkeley, Slate Geotechnical Consultants (Slate), and several…
View article: Cyclic and monotonic simple shear testing of native Christchurch silty soil
Cyclic and monotonic simple shear testing of native Christchurch silty soil Open
The first cyclic simple shear tests on high-quality retrieved specimens of Christchurch silty and sandy soil were performed to evaluate their liquefaction potential. The test specimens originate from stratified silty soil deposits in south…
View article: Effective Stress Analysis of Liquefaction Sites and Evaluation of Sediment Ejecta Potential
Effective Stress Analysis of Liquefaction Sites and Evaluation of Sediment Ejecta Potential Open
Sediment ejecta mechanism contributes significantly to the severity of liquefaction-induced ground failure (e.g., excessive land subsidence). Estimating the amount of ejected sediment is a key step to assess the severity of ground failure;…
View article: Test method for minimum and maximum densities of small quantities of soil
Test method for minimum and maximum densities of small quantities of soil Open
The minimum and maximum void ratios are required to establish the relative density of sandy soil. Undisturbed simple shear test specimens are often too small to provide enough material to employ the Japanese Standard JIS A 1224:2009 Test M…
View article: Geotechnical characterization and liquefaction evaluation of gravelly reclamations and hydraulic fills (Port of Wellington, New Zealand)
Geotechnical characterization and liquefaction evaluation of gravelly reclamations and hydraulic fills (Port of Wellington, New Zealand) Open
In the 2016 Mw 7.8 Kaikōura earthquake, widespread liquefaction occurred in the reclamations at CentrePort, Wellington (New Zealand), while less intense shaking during two earthquakes in 2013 produced only some liquefaction manifestation o…
View article: LIQUEFACTION ASSESSMENT OF RECLAIMED LAND AT CENTREPORT, WELLINGTON
LIQUEFACTION ASSESSMENT OF RECLAIMED LAND AT CENTREPORT, WELLINGTON Open
Observations of liquefaction-induced damage at the port of Wellington (CentrePort) provide an opportunity to evaluate the applicability of state-of-the-practice liquefaction evaluation methodologies on reclaimed land. This study focuses on…
View article: Recent Advances in Geotechnical Post-earthquake Reconnaissance
Recent Advances in Geotechnical Post-earthquake Reconnaissance Open
Field observations are particularly important in geotechnical engineering, because it is difficult to replicate in the laboratory the response of soil deposits built by nature over thousands of years. Detailed mapping of damaged and undama…
View article: Liquefaction resistance of Christchurch sandy soil deposits obtained from cyclic direct simple shear tests and CPT-based methods.
Liquefaction resistance of Christchurch sandy soil deposits obtained from cyclic direct simple shear tests and CPT-based methods. Open
Results from cyclic undrained direct simple shear tests on reconstituted specimens of two sands from Christchurch are compared against the liquefaction resistance inferred from CPT-based empirical liquefaction triggering methods. Limitatio…
View article: Runout evaluation of Oso landslide with the material point method
Runout evaluation of Oso landslide with the material point method Open
Long runout landslides can cause significant damage and represent one of the most important problems in geotechnical engineering. Understanding the mechanics of the landslide runout process is important for risk assessment and is challengi…
View article: Distinct element simulations of earthquake fault rupture through materials of varying density
Distinct element simulations of earthquake fault rupture through materials of varying density Open
Surface manifestations of earthquake fault rupture are strongly affected by the dilatant response of the soil deposit overlying the bedrock fault displacement. The granular material's in-situ void ratio and effective confining stress affec…
View article: Liquefaction effects and associated damages observed at the Wellington CentrePort from the 2016 Kaikoura earthquake
Liquefaction effects and associated damages observed at the Wellington CentrePort from the 2016 Kaikoura earthquake Open
Widespread liquefaction occurred in the end-dumped gravelly fills and hydraulically-placed dredged sandy fill at the CentrePort of Wellington as a result of the 14 November 2016 Mw7.8 Kaikoura earthquake. This liquefaction resulted in subs…
View article: U.S.—New Zealand— Japan International Workshop, Liquefaction-Induced Ground Movement Effects, University of California, Berkeley, California, 2-4 November 2016
U.S.—New Zealand— Japan International Workshop, Liquefaction-Induced Ground Movement Effects, University of California, Berkeley, California, 2-4 November 2016 Open
There is much to learn from the recent New Zealand and Japan earthquakes. These earthquakes produced differing levels of liquefaction-induced ground movements that damaged buildings, bridges, and buried utilities. Along with the often spec…
View article: Towards developing an engineering procedure for evaluating building performance on softened ground (NEES-2006-0224)
Towards developing an engineering procedure for evaluating building performance on softened ground (NEES-2006-0224) Open
Title: Towards developing an engineering procedure for evaluating building performance on softened ground (NEES-2006-0224) Year Of Curation: 2009 Description: Soil-foundation-structure-interaction (SFSI) plays a significant role in soil re…
View article: The Undrained Cyclic Response of Monterey Sand in Direct Simple Shear
The Undrained Cyclic Response of Monterey Sand in Direct Simple Shear Open
In 2010 and 2011 a series of earthquakes hit the central region of Canterbury,
\nNew Zealand, triggering widespread and damaging liquefaction in the area of
\nChristchurch. Liquefaction occurred in natural clean sand deposits, but also in
…