Presentation Title: “Seismic shaft design for the Central Interceptor project” presented by Dr Andy Dodds
Abstract: The Central Interceptor (CI) project includes large (up to 12m) diameter and deep (up to 80m below ground surface) circular shafts extending through Auckland geology that includes basalt, Tauranga Group (TG) alluvium soil and East Coast Bays Formation (ECBF) residual soil and soft rock. Seismic shaft design is discussed following the deformation-based pseudo-static approach as applied to Auckland seismicity and ground conditions. Included is commentary on some soil-structure interaction challenges associated with the presence of basalt and an internal cross-wall.
Bio: Dr Andy Dodds (NZCE – PhD, CPEng, PE/GE California) is an Associate Principal in Arup’s Auckland Office serving as Geotechnical Leader for Arup New Zealand and Arup’s Ground Engineering Skills Network Leader for the Australasia Region. With over 28 years of experience in geotechnical, earthquake and civil engineering gained both in New Zealand and around the world, Andy applies this experience in leading and managing projects and teams.
Presentation Title: “Seismic design aspects of the City Rail Link tunnels” presented by Wataru Okada
Abstract: The City Rail Link (CRL) Project is a 3.45km twin-tunnel underground rail link allows the Auckland rail network to at least double rail capacity. The C3 Contract comprises two new underground stations, two redeveloped stations, twin bored running tunnels and two mined junction caverns. The seismic design of the tunnel structures is presented, including geological features along the tunnel alignment, challenges associated with ground conditions, key design considerations and criteria.
Bio: Wataru Okada is a Technical Principal in WSP Auckland Office. He has 25 years’ experience in design and construction of large civil infrastructure and underground works in New Zealand, Australia, Japan and Singapore. Wataru has worked on the City Rail Link C3 Contract as the Tunnel Discipline Lead and CPS Lead over the last 5 years. Wataru completed his undergraduate degree and Masters degree project in earthquake engineering at the University of Canterbury. Earlier in his career, Wataru worked as a site engineer on the Tokyo Metro Oedo Line and Singapore MRT North East Line. Since 2000, Wataru has been working on a wide range of infrastructure projects in NZ and abroad in the consulting environment. His recent project involvement includes the Waterview Connection, City Rail Link C2, C3 and C6 Contracts and iRex Ferry Terminal Upgrade.
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