Abstract
A study has been made into the nature of the rate-dependent behaviour of rock joints. An experimental investigation using a dynamic direct shear machine showed the frictional resistance of rock joints to be dependent on the rate of shear displacement and that the magnitude of this effect was quite variable, depending mainly on the rock type and normal stress level. In general, for harder rocks, the frictional resistance was found to decrease with increasing shear displacement rates greater than a variable critical velocity. Conversely, for softer rocks, the resistance was observed to increase with increasing shear velocity, up to a critical shear displacement rate, and thereafter remain essentially constant.
Published Version
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