In this study the stress-strain response of two different moderately weathered granites (with different clay contents) is investigated. To carry out this investigation a standard press has been servo-controlled, in such a way that loading-unloading cycles can be executed and at the same time postfailure behavior can also be studied. A series of unconfined and confined compressive tests have been performed on rock samples. Results are plotted and analyzed. They have been interpreted to obtain the most significant parameters including elastic, strength and post failure parameters, among which, special attention has been given to the drop modulus and the residual strength criterion. The main conclusions regard the developed capability to investigate consistent post-failure properties of rocks by means of servo-controlled press set-ups, which should be, however, improved in the future. Results have been analysed in the light of rock weathering and clay content.

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