David was appointed by Amberg Engineering as Chief Site Supervisor for extensive grouting works and completion of the excavation of the 15.2km headrace tunnel excavated by TBM and a 3.7km drill and blast tunnel linking the two dams.
David joined the Amberg team in Sri Lanka on the troubled Uma Oya project as their Chief Site Supervisor. The TBM in the 15km headrace tunnel was stopped in May 2016 to carry out grouting works. The initial post grouting works was completed in December 2016.
GFWAust has established a relationship with Mainmark Civil & Mining P/L to provide a complete chemical and cementatious grouting solution.
Mainmark Civil & Mining P/L is part of the Mainmark Corporation - leaders in advanced ground engineering technologies. Mainmark offers a unique, innovative service rectifying problems with foundation ground in residential, industrial, commercial and civil engineering situations. Mainmark specialises in resin injection technology, and is the licensed provider of the Uretek® technology in Australia, New Zealand, Japan, and Thailand.
After living through two major earthquakes in Nepal of more than 7 magnitude, David Lees returned to Australia on 30th May 2015.
David has been working on the Melamchi Water Supply Project since July 2014 as a Senior Tunnelling Engineer. On April 25th a devastating earthquake hit the country, a second one occurred on May 12th and in between and after there have been many after shocks. The area in which the project lies Sindhupalchowk is the worst hit area and the community has suffered tremendously. Since the earthquake on 25th April David has been assisting the emergency response teams, coordinating road clearance with the local army major.
The new development at No 3 Mineapolis Crescent required an excavation for basement parking. GFWAust were appointed to create a retaining wall by permeation grouting around the site for a distance of 40m to enable excavation to bedrock at a depth of 3m below surface.
The ground conditions consisted of Botany Sands with minor layers of peat and Coffee Rock. The sand was stabilised with interlocking 500mm diameter columns of grouted sand.
