TY - JOUR
TI - Correlation between micro-structure and acoustic emission characteristics of granite by split tests
AU - Geng Qian-Cheng
AU - You Shuang
AU - Wang Huan
AU - Ji Hong-Guang
AU - Zhang Xiu-Feng
AU - Chen Yang
JN - Thermal Science
PY - 2023
VL - 27
IS - 1
SP - 663
EP - 670
PT - Article
AB - The mesoscopic structure of rocks determines their strength and deformation  characteristics. The grain and pore size distribution of granite samples  buried depth of 1600 m to 1900 m in a goldmine of Shandong Province are  measured by polarizing microscope and low-field nuclear magnetic resonance.  The splitting test is carried out and the acoustic emission signal is  obtained in real time by using an electro-hydraulic servo press and PCI-2  acoustic emission collector. The relationship between meso-mechanics and  acoustic emission characteristics of split granite is analyzed. The  experimental result shows that there is no clear correlation between  meso-grain size and pore size distribution. Rocks with larger mineral grains  easily form inter-embedded structures between grains and grains, the bearing  effect of grains is enhanced, and the tensile strength of rocks is improved.  The level of stress concentration in the rock is closely related to the pore  size of the rock, and the acoustic emission ringing count before the main  rupture in the large aperture (0.1~10 mm) of the rock is more active than  that of the small aperture rock (0.01~1 mm), and a large number of high  frequency acoustic signals are induced by the penetration between the pores  in the unstable failure stage and post-peak failure stage, the stress  concentration is higher, and the energy release frequency is increased,  however the energy released strength by a fracture is weak.