Site Investigation Projects

• Wigram Magdala Link Christchurch (January 2009)

  MSDS were engaged to conduct a detailed subsurface investigation for the Wigram Magdala Link to obtain engineering parameters for foundation design. Investigation methods included CPTu Soundings and Boreholes (using Cable Percussive methods) to depths of between 20 and 30mbgl – including the installation of a piezometer in one of the two boreholes. In-situ testing in the boreholes comprised of SPT testing and Thin Wall Tube sampling.

  The CPTu soundings were conducted prior to the Boreholes enabling the Thin Wall Tube sampling to target horizons of interest and verify the materials identified by the CPTu interpretive analysis. The works were completed within budget and on schedule (11 days).

  Client referees and contact details:

  Richard Young

  BECA Infrastructure Ltd (+ 64 3 366 3521)
  

  
  

• Wairakei Diversion Christchurch (April 09 - current)

  Subsequent to the successful completion of the Western Interceptor investigation, MSDS were engaged to complete a detailed subsurface investigation along the proposed route of the Wairakei Diversion. The purpose of the investigation was to determine the in-situ engineering parameters for construction. The scope of works initially comprised of 12 CPTu soundings to 10mbgl, however due to reaching refusal on shallow gravels, the works were modified to include Cable Percussive drilling with SPT testing, bulk samples, in-situ permeability testing and subsequent piezometer installation.

  Given the sensitive nature of the area (Fendalton), MSDS felt that Cable Percussive methods were not suitable and offered Direct Push (3 1/2” Dual Tube) as an alternative. To date the alternative has proven to be 50% faster, 40% cheaper, and provided more accurate in-situ testing and sampling. As each site has been completed in less than a day, the disturbance to neighbouring residents is very limited and the sites easily kept compact and clean.

  Client referees and contact details:

  Callum McCurach

  URS NZ Ltd (+64 3 943 0402)
  

"A selection of past projects"