Geotechnical Challenges in the Cross-Harbour Pipeline, Wellington, New Zealand
Publication: Lifelines 2022
ABSTRACT
The existing water supply to Wellington (New Zealand’s Capital City) relies on water transmission pipelines that cross the active Wellington Faultline in several locations. These pipelines are expected to break or sustain significant damage in a major Wellington Fault rupture event. The construction of a Cross-Harbour Pipeline (CHP) will significantly improve both the disaster and operational resilience of Wellington’s water supply by providing an alternative pipeline route that does not cross the Wellington Fault. The design approach and route selection process is discussed in the companion paper “The Design Approach to the Cross-Harbour Pipeline, Wellington, New Zealand.” Several geo-challenges may affect the construction and performance of the over 12 km long marine segment of the new pipeline. This, and its alternatives, straddle over soft marine fine-grained sediments, liquefiable coarse-grained soils, the shallow aquiclude layer that caps the aquifer that is the main source of water for Wellington, and some active faults. These challenges and their combinations under various loading conditions are taken into consideration and assessment to inform the selection of a resilient route and the design of it.
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Lifelines 2022
Pages: 706 - 715
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Published online: Nov 16, 2022
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