STUDY ON THE DEFORMATION FAILURE AND ENERGY PROPERTIES OF MARBLE SPECIMEN UNDER TRIAXIAL COMPRESSION

In the paper, experiments were carried out to investigate marble specimens under conventional triaxial compression by the RMT-150B servo-controlling testing machine. Based on the experimental results, the deformation failure and energy properties of marble specimens under conventional triaxial compression were studied. The results show that marble will manifest the property of strain inteneration when the material in the rock does not turn uniform under the lower confining pressure. However, marble will show the property of plastic flowage when the material deformation becomes uniform under higher confining pressure. There is a a positive linear relation between the peak strain of rock material and the confining pressure. The sensitivity of residual strength on the confining pressure is higher than that of peak strength. The failure strain energy of rock increases linearly as the confining pressure increases. The total fracture energy of rock specimens also increases linearly as confining pressure increases.