Document Type

Conference Paper

Publication Date


Publication Details

Ross Seedsman, Preinstalled Cable Bolts in Longwall Installation Roads, 15th Coal Operators' Conference, University of Wollongong, The Australasian Institute of Mining and Metallurgy and Mine Managers Association of Australia, 2015, 117-127.


Long tendon support is typically installed in the first pass of an installation roadway meaning that it is pre-installed as the full roadway width is developed. The recognition of additional compressive failure in a rock mass as the roadway is widened results in a set of challenges for the design of the pre-installed long tendons support. Cable bolts cannot prevent the onset or progression of failure and hence must be able to survive the associated deformations. After failure there are stress reductions in the immediate roof that may cause the cables to debond. In certain geological conditions pre-installed, pre-tensioned, fully grouted cables may be too stiff and could fail due to their inability to accommodate deformations of the excavation. A case study is presented and analysed using some readily available analytical tools that capture what are considered as the key aspect of the behaviour model.