WTS2 Northern Access Road Tunnel

Ongoing pit expansion works for Rio Tinto required a new haul road to cross the existing Northern Access Road. The Western Turner Syncline Phase 2 (WTS2) Northern Access Road Tunnel project includes a 100 m long concrete arch with haul road overpass, a 600 m long bypass road and significant earth embankments for the overpass ramps. Geotechnical works included desktop studies and a ground-breaking investigation, interpretive ground models including cross sections relevant to the tunnel alignment, haul road and fill embankment. Our engagement also included the identification of geohazards and risk mitigation strategies, foundation assessments of tunnel and a finite element analysis of the tunnel / soil interaction, slope stability analysis, ground improvement and earthwork recommendations and borrow materials assessments.