CHARACTERISTICS OF DEFORMATION OF ROCK-LIKE MATERIALS UNDER TRIAXIAL COMPRESSION

IN THIS PAPER THE AUTHORS DESCRIBE TRIAXIAL COMPRESSION TESTS PERFORMED ON CUBIC SPECIMENS OF CEMENT MORTAR SIMULATING ROCK-LIKE MATERIALS, USING ONE VERTICAL AND TWO HORIZONTAL PAIRS OF JACKS. THE CHARACTERISTICS OF DEFORMATION UNDER VARIOUS CONDITIONS OF TRIAXIAL COMPRESSION SHOW THAT: (1) THE STRESS-STRAIN RELATIONSHIPS ESPECIALLY AFTER FAILURE REPRESENTED BY THE SUDDEN CHANGE OF STRESS- STRAIN RATIO ARE AFFECTED BY THE VALUE OF HYDROSTATIC AND DEVIATORIC STRESS COMPONENTS AND THE STRESS PATH, (2) THE CHANGE OF VOLUME AFTER FAILURE IS NOT NEGLIGIBLE; (3) THE MECHANICAL STATE OF THESE MATERIALS CHANGES FROM BRITTLE TO DUCTILE WITH INCREASING CONFINING STRESS. IT IS ALSO SHOWN THAT THESE MATERIALS BECOME ANISOTROPIC AT FAILURE ZONES WHEN SUBJECTED TO THE STATE OF DEVIATORIC STRESS. /AUTHOR/ IN THIS PAPTER THE AUTHORS DESCRIBE TRIAXIAL