ABSTRACT:

Studies of brittle rock samples failure were carried out in Laboratory of Geodynamics of Far-Eastern University, Vladivostok, Russia. It was assisted by servocontrol loading machine MTS-816, acoustic emission complex and multi-channel complex. Regularities of formation and development of dissipative mesodefects structures in rock samples under uniaxial compression were determined as a result of complex deformation and acoustic experiments at final stage of loading. Study of acoustic emission in rock samples under at final stage of loading were carried out with the release of the source forming stage and its preparation. Anomalous deformations of high stressed rock samples were associated with failure source forming stages defined by the acoustic method. System of reliable precursors of failure involving long-term, medium-term and short-term precursors was established. This system of precursors reflects the stages of formation and development of dissipative mesodefects structures in high stressed rock samples.

1 INTRODUCTION

Research of the mechanism for brittle rock samples failure prepares is important part of prediction and prevent geodynamic phenomenon in rock mass. Phenomenon of reversible linear deformations was discovered during previous research (Makarov et al. 2012). And two-stage model of rock spacemen failure source forming was state during acoustic investigation of high stressed rock samples (Kuksenko et al. 1996). Research of this phenomenon has been continued during experiments with rock samples under uniaxial load in Laboratory of Geodynamics, Far Eastern Federal University (Vladivostok City, Russia). It was found during research, that reversible linear deformations at local measuring areas should be divide up two different types. Relation between reversible linear deformations at local measuring areas and source of failure was determine by means 3-D model of source of failure, made at basis of acoustic emission data. This kind of anomalous deformations of high stressed rock sample was explained by the model of "soft-inclusion" (Guzev et al. 2007). Also, rock samples failure source forming stages was state at basis of the amplitude-frequency signal analysis. Identification of the relationship between reversible linear deformations at local areas and forming of failure source allow to state the complex system of rock samples failure precursors.

This content is only available via PDF.
You can access this article if you purchase or spend a download.