Correlation between micro-structure and acoustic emission characteristics of granite by split tests

The mesoscopic structure of rocks determines their strength and deformation characteristics. grain pore size distribution granite samples buried depth 1600 m to 1900 in a goldmine Shandong Province are measured by polarizing microscope low-field nuclear magnetic resonance. splitting test is carried out the acoustic emission signal obtained real time using an electro-hydraulic servo press PCI-2 collector. relationship between meso-mechanics characteristics split analyzed. experimental result shows that there no clear correlation meso-grain distribution. Rocks with larger mineral grains easily form inter-embedded structures grains, bearing effect enhanced, tensile improved. level stress concentration rock closely related rock, ringing count before main rupture large aperture (0.1~10 mm) more active than small (0.01~1 mm), number high frequency signals induced penetration pores unstable failure stage post-peak stage, higher, energy release increased, however released fracture weak.