Study on Strain Rate Effect and Size Effect of Dynamic Response Characteristics of Granite

Journal: Architecture Engineering and Science DOI: 10.32629/aes.v2i1.268

Zhihang Hu, Yuying Ning, Jiuyang Zhang, Jianyu Zhao

School of Mining Engineering, University of Science and Technology Liaoning, Anshan 114051, Liaoning, China Engineering and Technology Research Center of High-efficiency Mining-processing and Utilization of Metal Mineral Resources of Liaoning Province, Anshan 114051, Liaoning, China

Abstract

Under impact load, the dynamic mechanical properties of rock are complex and changeable. The Split Hopkinson Pressure Bar (SHPB) system was used to change the impact load to carry out different strain rate loading tests on granite with different aspect ratios, and to analyze the influence of strain rate and aspect ratio on the dynamic energy consumption of granite crushing. The results show that at an impact velocity of 14 m/s, the granite with an aspect ratio of 1.4 appears to be strip-shaped fragments after being broken; the granite with an aspect ratio of 1.0 uniform square fragments after being broken; the granite with an aspect ratio of 0.6 appears to be a large number of flat fragments after being broken. When the load strain rate of the granite with an aspect ratio of 0.6 increases from 50 s^-1 to 150 s^-1, the energy-time density index increases significantly; when the load strain rate exceeds 150 s^-1, the energy-time density index decreases. When the strain rate of granite with an aspect ratio of 1.0 exceeds 80 s^-1, the energy-time density increases significantly. When the strain rate of the granite with an aspect ratio of 1.4 exceeds 60 s^-1, the rate of increase of the energy-time density of the rock increases significantly.

Keywords

strain rate, fragmentation, SHPB, energy-time density

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