Solution

Due to the remote location of the slope it presented many challenges. All materials needed to complete the project had to be transported by helicopter, and the site could only be reached on foot via the 500 year old “Jumandi Trail”. Difficult access to the slope face meant that all equipment and the installation crews had to be connected to abseil points. Reprofiling the slope was completed gradually, in sections. To stabilize the slope, 220 Platipus B4 Cast SG Iron anchors were installed to a depth of 8m (26’), on a 2m (6.5’) off-set grid pattern, using a core drill rig with mounted compressor. Each anchor was proof loaded to 50kN (11,200 lbs). In addition, 20 Plati-Drains were installed to a depth of 5m (16.5’) at the top of the slope and 7m (23’) at the bottom of the slope to reduce pore water pressure and increase stability. Once the B4 anchor systems and Plati-Drains were installed, 820m2 (980 yd2) of HPTRM was placed along the entire slope face and secured in position using load plates and load nuts to complete the installed B4 anchor systems. An additional 200 Platipus S2 ARGS assemblies were also installed to hold the HPTRM tight to the slope surface to provide erosion control measures and encourage re-vegetation.