STUDY OF GEOMATERIALS STRUCTURE FOR SUBSTANTIATION OF THE EARTHQUAKESPHYSICS

Experiments with granite, marble, rock salts and epoxy samples were ca rried out under poliaxial loading. Microscopic and acoustic emission m ethods were used to control cracking in the samples. The results show that during supercritical deformation the cleaveges (block) appear and are distributed according to size in hierachial order of the primary typical sizes L(i); in the L(i) sequence the relation in neighbouring L(i + 1) to L(i) almost reaches the constant value of K = 3. The K val ue is not affected by the type of loading, boundary conditions, shape and size of samples. The experiments with marble and iodide of ammonia deformation were conducted in the solid-phase device and hydraulic hi gh-pressure unit with supplementary uniaxial compression. The results show that in the course of phase transition there occur a sudden chang e in the elastic waves velocities and decline in the deformational cha racteristics of the materials. The using of neutron diffraction method shows that the modifications in the physical parameters caused by a d eformation are associated with the structural changes in the samples. The obtained results have important implications for understanding of the physics of earthquake preparation.