Abstract
The first part of this paper describes laboratory creep experiments on small scale jointed specimens. The tests, carried out on a synthetic rock gypsum material, showed that clean, unfilled joints augment the axial creep displacements of rock specimens loaded in uniaxial compression. These increased creep deformations are due to both normal and shear creep displacements across the joint. Joint creep appears to depend both upon the applied joint shear stress to shear strength ratio and upon the absolute stress level across the joint. In the second part of the paper, a simple, theoretical asperity creep mechanism is proposed to explain, at least in part, the observed joint creep behaviour. For the covering abstract of the symposium see TRIS 452576. (TRRL)
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