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Conference Day One : Thursday, 29th June 2017

08:30 AM - 09:00 AM Coffee & Registration

09:00 AM - 09:10 AM Opening Remarks from Conference Chairperson



09:10 AM - 09:50 AM Utilising a Jet Grouted Groundwater Cutoff System as an Alternative to a Diaphragm Wall

  • Providing the project overview, challenges and decision making process as to why this particular solution was pursued from a financial perspective
  • Highlighting the technical details pertaining to ground conditions, jet grout soil mixtures, piling sizes, testing, outcomes
  • Looking at efficient piling solutions for high-rise structures between range of 60 to 90 storeys
Joint presentation by Meriton Group and Keller Group

09:50 AM - 10:30 AM A Case History of a Piled Mat Foundation

Stephen Buttling, Principal, National Geotechnical Consulting
This case history concerns three residential tower blocks, each of 70 storeys so over 200 m high, sited side by side on a mat foundation about 30 x 90 m and linked structurally at two levels. The mat was supported by 399 bored piles, following reasonable site investigation and testing, including an instrumented static load test and six dynamic load tests. 15 of the piles were then instrumented with vibrating wire strain gauges before forming the mat foundation, and these and the settlement of the mat were monitored during construction of the towers, with the settlement monitoring continuing for another 7 years after topping out. The settlement of the structure, and the way in which the loads were distributed and how this varied with time, will be shown. Recently numerical modelling has been carried out, and this has achieved excellent correlation with the measured data.

Key points to discuss:
  • Piled mat foundation (not piled raft)
  • Site investigation
  • Design of single piles and pile groups
  • Static load and dynamic pile testing
  • Instrumentation and monitoring
  • Foundation performance
  • Numerical modelling

Stephen Buttling

Principal
National Geotechnical Consulting

10:30 AM - 11:00 AM Speed Networking

11:00 AM - 11:30 AM Morning Tea and Networking Break



11:30 AM - 12:10 PM Hamilton Expressway

David Sullivan, Principal Geotechnical Engineer, Coffey
The Waikato Expressway project will improve safety and reliability and reduce travel times and congestion on SH1 by delivering a four-lane highway from the Bombay Hills to south of Cambridge. The expressway is being built in seven sections. With an estimated project cost of $100million, the project is expected to be completed in December, 2019.

David Sullivan

Principal Geotechnical Engineer
Coffey

12:10 PM - 12:50 PM Case Study: Kawarau Bridge Development in Queenstown

Ioannis K. Antonopoulos, Principal Geotechnical Engineer, Coffey Geotechnics
The $20-$100 million two-lane bridge on State Highway 6 at Kawarau Falls near Queenstown is scheduled to open in the second half of 2017. Designed to withstand a once in every 2500-year earthquake, the new bridge will be less vulnerable to extended closures caused by major natural events that would effectively close the southern highway access into the Queenstown area. The area has extreme seismic risk and major lateral loads. Large 2.1m diameter monopoles have been proposed to withstand any future seismic and lateral stresses. Further, the bedrock in the Kawarau River is highly anisotropic, creating even more demanding design requirements.
  • Implementation of large diameter monopoles
  • Overcoming anisotropic bedrock conditions
  • Designing for major seismic loads and lateral stress

Ioannis K. Antonopoulos

Principal Geotechnical Engineer
Coffey Geotechnics

12:50 PM - 1:50 PM Lunch



1:50 PM - 2:30 PM Design of Pile Foundations and Ground Improvement on Sites prone to Liquefaction and Lateral Spreading

Dr Alexei Murashev, Technical Principal - Geotechnical Engineering & Risk, Opus International Consultants
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.

Dr Alexei Murashev

Technical Principal - Geotechnical Engineering & Risk
Opus International Consultants
  • Reflections on Modern Geotechnical Investigation: use of the Seismic Dilatometer for design
  • Obtaining reliable design values to ensure program deadlines are met
  • Selecting the correct design of ground improvement
  • Modeling piles and pile groups
  • Cutting cost & generating efficiency: Looking at pile behavior infinite element program to identify different behaviors
  • Changing the mindset: Reconciling different perceptions and accepting results

  • Dr Alexei Murashev

    Technical Principal - Geotechnical Engineering & Risk
    Opus International Consultants

    Pathmanathan Brabhaharan

    National Technical Director
    Opus International Consultants

    3:30 PM - 4:00 PM Afternoon Tea



    4:00 PM - 4:40 PM Optimising the Deep Foundations for Various Bridges at the Hamilton Expressway by Using Advanced Pile Testing Methods and Quality Assurance Tools

    Ronald Damen, Senior Geotechnical Engineer, Fletcher Construction
    • Short overview of high strain dynamic testing;
    • Using dynamic testing to achieve a more economic design;
    • The application of remote testing: advantages and challenges;

    Ronald Damen

    Senior Geotechnical Engineer
    Fletcher Construction

    4:40 PM - 5:20 PM Champagne Round Table Discussion: Evaluating Latest Trends and Innovations in Pile Design

    Ronald Damen, Senior Geotechnical Engineer, Fletcher Construction
    It’s worthy to look at the current trends in today’s Deep Foundations market in order to assess innovation in pile design. This champagne roundtable session will allow participants to discuss latest innovations and methods currently being implemented.
    • Understanding of the deformational aspect of pile design
    • The use of vibrators in the field of deep foundations and its impacts and evolution
    • The interaction between technology and design plays a determinant role in the evolution of deep foundations and piling

    Ronald Damen

    Senior Geotechnical Engineer
    Fletcher Construction

    5:20 PM - 5:30 PM Closing Remarks from Conference Chairperson



    5:30 PM - 11:59 PM Networking Drinks