108 Flinders St, Melbourne
Site area 1400m2
Bulk excavation for basement 18,500m3
Bored retention piles 90 no.
Temporary ground anchors and rock nails 400 no.
Shotcrete wall 2200m2
Hybrid retention scheme with conventional retention piles & anchors; rock nails and shotcrete at lower levels
Challenges included tight site, deep basement, difficult access from busy city street and excavation in hard rock