Interface behaviours from large diameter ring shear tests

摘要

A series of constant load (CNL) and constant stiffness (CNS) interface tests have been performed using sand in a large 1m diameter ring shear apparatus. CNS tests were performed using silica and carbonate sands to explore effects that volume changes have on the stresses developed on rough and smooth interfaces. Volume changes are shown to be partly caused by grain crushing, which also affects the interface friction angle. Volume changes due to grain crushing can be correlated with work done on the interface. Cyclic tests were performed and show that volume changes are dependent on the cyclic displacement amplitude. These results indicate that friction fatigue is more likely to be observed in dense fine grained sands.