THE REAL IN TIME CT MONITORING OF THE MESODAMAGE EVOLUTION LAW OF SANDSTONE UNDER TRIAXIAL COMPRESSION

The real in time computerized tomography (CT) testing of the meso-damage propagation law of the whole sandstone failure process under triaxial compression has been completed using the newest specified triaxial loading equipment corresponding to the OT machine. Through the CT scanning, the clear CT images which include from the microcracks compressed stage to growth stage, bifurcation stage, development stage, crack fracture stage, the rock sample failure until to unloading stage in the different stress states were obtained. The CT values, CT images and the other data have been analyzed. Based on the results of the CT testing of meso-damage evolution law of rock, the stress threshold value of maso-damage of rock is given, and the stress-strain complete process curve of rock is divided into some sections. The initial rock damage propagation law is given in this paper.