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Abstract
A research project in progress at the UK mining research and development establishment is an attempt to quantify the in-situ strength of strata and to determine its influence on roadheader performance. Results of in-situ and laboratory test measurements on strata samples cut were used to produce a performance index. An expanding wedge tester was designed for in-situ strength testing. The design is based on expanding a wedge within a drilled hole and applying a force to the wedge to produce failure. It is concluded that (1) uniaxial compressive strength is not by itself a reliable indicator of machine performance, (2) a combination of laboratory properites slightly improves the prediction based on uniaxial compressive strength, and (3) the expanding wedge tester gave an accurate indication of cutting performance. (TRRL)
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