Dr Alexei Murashev
Technical Principal - Geotechnical Engineering & Risk
Opus International Consultants
1:50 PM Design of Pile Foundations and Ground Improvement on Sites prone to Liquefaction and Lateral Spreading
The processes of soil liquefaction, lateral spreading and soil-pile foundation-structure interaction during earthquakes are extremely complex. As a result, designing pile foundations to resist earthquake loads, soil liquefaction and lateral spreading effects presents considerable challenges. Recently published New Zealand Transport Agency’s Design Guidelines for Bridges on Sites prone to Liquefaction and Lateral Spreading give detailed recommendations for seismic design of pile foundations. The Guidelines’ design procedures are based on observations of pile foundation performance in recent strong earthquakes, including the 2010 – 2011 Canterbury earthquake sequence, international trends in research into design of pile foundations for liquefaction in US, Japan, Italy and China as well as New Zealand experience with reinstating existing and designing new pile foundations on a large number of bridge and building projects.
- The Guidelines have been used to design pile foundations for six bridges for the Christchurch Northern Arterial Project, ten bridges for the Waikato Expressway Project, Ferrymead and Bridge Street bridges in Christchurch as well as foundations of the wharf structures in Lyttelton Port and the Grey Base Hospital.
- In many cases the use of the Guidelines’ design procedures enabled the designers to achieve substantial cost savings due to avoidance or reduction of the extent of ground improvement work.