Abstract
This note describes a rotary shear machine similar to those designed by Bishop, Green, Garga, Andersen & Brown (1971) and Bromhead (1979), but suitable for testing rock surfaces, especially the shear strength of rock surfaces separated by an infilling of weaker material. The machine was constructed in 1986 and has recently been used to complete a series of trial tests on clean, flat rock surfaces and similar surfaces separated by clean rock gouge. It was specifically designed to accurately measure shear parameters up to peak failure and to follow these parameters beyond failure to their residual or basic angle of friction. This permits an accurate study of the mechanisms governing shear resistance in rock joints which are subjeced to large displacements.
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