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Seismic Performance of CentrePort Wellington
The Port of Wellington experienced liquefaction of reclaimed land in the 14 November 2016 Mw7.8 Kaikoura earthquake. The liquefaction caused global settlement of the sandy gravel and sandy fill deposits and lateral movement of the fills towards the sea. The reclamations at the port are comprised of different soil types (gravels and sands), different ages (40 to 100 years), and different methods of construction (end-tipped and hydraulic fills). Cone penetration tests were advanced successfully in gravelly fills using robust equipment. When combined with conventional soil exploratory borings, these data characterized well the liquefaction hazard at the port. The 30% to 60% of sand and silt in the well-graded gravelly fill largely determined its liquefaction resistance and seismic performance, suggesting the soil matrix is dominated by these finer particles. State-of-the-practice CPT-based liquefaction triggering and post-liquefaction reconsolidation settlement assessments identified loose zones of fill that likely liquefied, which produced widespread ejecta and caused damaging vertical and lateral ground movements. CPT-based procedures estimated well the vertical settlement of the gravel fills and the sand fills. Recommendations are made on how to best address the site investigation challenges at the gravelly soil areas of the port.
Seismic Performance of CentrePort Wellington
The Port of Wellington experienced liquefaction of reclaimed land in the 14 November 2016 Mw7.8 Kaikoura earthquake. The liquefaction caused global settlement of the sandy gravel and sandy fill deposits and lateral movement of the fills towards the sea. The reclamations at the port are comprised of different soil types (gravels and sands), different ages (40 to 100 years), and different methods of construction (end-tipped and hydraulic fills). Cone penetration tests were advanced successfully in gravelly fills using robust equipment. When combined with conventional soil exploratory borings, these data characterized well the liquefaction hazard at the port. The 30% to 60% of sand and silt in the well-graded gravelly fill largely determined its liquefaction resistance and seismic performance, suggesting the soil matrix is dominated by these finer particles. State-of-the-practice CPT-based liquefaction triggering and post-liquefaction reconsolidation settlement assessments identified loose zones of fill that likely liquefied, which produced widespread ejecta and caused damaging vertical and lateral ground movements. CPT-based procedures estimated well the vertical settlement of the gravel fills and the sand fills. Recommendations are made on how to best address the site investigation challenges at the gravelly soil areas of the port.
Seismic Performance of CentrePort Wellington
Bray, Jonathan D. (author) / Cubrinovski, Misko (author) / Dhakal, Ribu (author) / Torre, Christopher de la (author)
Eighth International Conference on Case Histories in Geotechnical Engineering ; 2019 ; Philadelphia, Pennsylvania
Geo-Congress 2019 ; 76-89
2019-03-21
Conference paper
Electronic Resource
English
Seismic Performance of CentrePort Wellington
| TIBKAT | 2019
Seismic Performance of CentrePort Wellington
| British Library Conference Proceedings | 2019
British Library Online Contents | 2017