ABSTRACT
In this research the authors have carried out uniaxial and biaxial compression tests of artificial cube specimens with hole and argillite to study the process of deformation prior to failure using the multiparametric equipment designed for synchronous recording of physical fields of stresses, macrostrains, Microseismic Emission (MSE) and microstrains by speckle method. The complex data of evolution of microseismic emission signals, temperature field and microdeformation field under uniaxial and biaxial loading prior to the destruction of prismatic samples from artificial geomaterial allowed to establish the time-space relationship between the features of signal changes depending on loading level.
The evolution of deformation process, development of microdamages and the formation of main rupture fracture lead to significant transformation of spectral composition of microseismic emission signals, microdeformation field, and the temperature field. In the region of future main discontinuity the temperature increases, localization of maximum microdeformations occurs and velocities of microdeformations components increase. Generation of powerful low-frequency harmonics at loads approaching the peak, can serve as a precursor of a rupture on the surface and, consequently, destruction of the geomaterial.
