CEE 200 Seminar: Dr. Sjoerd van Ballegooy

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Sjoerd van Ballegooy, Ph.D.

Senior Geotechnical Engineer and Technical Director at Tonkin + Taylor Ltd, New Zealand
“Ground failure in the 2010 – 2011 Canterbury Earthquake Sequence and its Effects on Structures”
Abstract
The 2010 – 2011 Canterbury Earthquake Sequence (CES) affected the Canterbury region of New Zealand resulting in widespread ground surface deformation, mainly due to liquefaction ejecta, liquefaction related ground volumetric densification, topographic relevelling and lateral spreading, causing extensive land, infrastructure and building damage. The liquefaction affected 51,000 residential properties and damaged approximately 15,000 residential houses beyond economic repair. The total economic losses from the CES were in the order of $40B, with one third of the economic losses being directly attributable to liquefaction. The CES brought into stark relief the disconnection between building practice and natural hazard susceptibility. Despite the knowledge that most of the residential land in eastern Canterbury was susceptible to liquefaction, brittle, heavy, unreinforced slab-on-grade residential house construction predominated, particularly over the past 20 years. The first half of the presentation will examine the lessons learnt from the liquefaction damage and presents a case for a consideration in how we build our homes to be affordable, resilient and more readily repairable, by better matching building typology to the natural hazards that have the potential to occur. The second half of the presentation will overview the results and findings from a large ground improvement trial programme, undertaken as part of the earthquake recovery.
Bio
Dr. Sjoerd van Ballegooy is a senior geotechnical engineer and technical director at Tonkin + Taylor Ltd, a specialist geotechnical consultancy company in New Zealand. His expertise include numerical modelling including ground water, soil structure interaction, steady state and dynamic seismic modelling. Since September 2010, Sjoerd has been involved in leading the geotechnical response to the damage caused by the 2010 – 2011 Canterbury earthquake sequence and received the Queen’s Service Order, Honorary Companion for his services to geotechnical science.
Date/Time/Location:
Kinsey Pavilion 1200B
Apr 19, 2016
4:00 pm - 5:00 pm

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