Cataract Tunnel

Client: Sydney Catchment Authority
Design: Drilling and Grouting for Void Filling
Area: 500m3
Completion: August 2013

In July and August 2013, RIX conducted an extensive ground improvement program at various Zones of Cataract Tunnel in order to improve and investigate the stability of affected zones of Tunnel by longwall mining. The main activities include:

  • Surface and underground drilling;
  • Consolidation grouting;
  • Convergence monitoring;
  • Borescoping survey.

The main challenges in performing these works were:

  • Working inside the tunnel in presence of water;
  • Restricted environmental regulations;
  • Limited time frame available to complete the project;
  • Adverse ground conditions in a major fault zone