Rock Bolts

The RIX Group offers rock bolt installation. A rock bolt is a long anchor bolt, for stabilizing rock excavations, which may be used in tunnels or rock cuts. It transfers loads from the unstable exterior to the confined (and much stronger) interior of the rock mass.

Rock bolts were first used in mining starting in the 1890s. Rock bolts were applied to civil tunnelling support in the US and in Australia, starting in the late 1940s. Rock bolts were used and further developed in 1947 by Australian engineers who began experimenting with 4m-long expanding anchor rock bolts while working on the Snowy Mountains Scheme.

Rock bolts are almost always installed in a pattern and the design depends on the rock quality designation and the type of excavation. Rock bolt types include:

  • Mechanical bolts
  • Epoxy bolts
  • Cement grouted bolts
  • Fiberglass bolts

Centre: Roof bolting and dry spray at the Scenic Railway in the Blue Mountains.

Left and Right: Drilling rock bolts with an excavator-mounted drill rig at the Narrabri Coal Operations (Whitehaven Coal).