Abstract
Application of the principle of the conservation of energy in the context of rock mechanics leads to examination of the thermic phenomena which accompany the basic mechanical transformations in a rock mass or on its discontinuities. This paper describes original laboratory experimental work on artificial discontinuities, carried out by measuring heating of the joint during triaxial tests on pre-cut artificial joints.Digital calculation of heating was carried out supposing the distribution of stresses on the joint to be uniform. Comparision of these calculated results with the experimental results reveals considerable concentration of stresses in the joint. These results are also compared to those obtained from previous direct shear tests.This study leads to the questioning of the validity of the measurements obtained in the standard manner in friction tests on pre-cut joints using a triaxial machine.
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