Experimental Study on the Dynamic Failure Behaviors of Granite After Chemical Corrosion

• Published in: Rock mechanics and rock engineering 2023-11, Vol.56 (11), p.7923-7937
• Main Authors: Zhou, Xiao-Ping, Yu, Tian-Yu
• Format: Article
• Language: English
• Subjects: Bearing capacity; Chemical reactions; Civil Engineering; Corrosion; Corrosion mechanisms; Corrosion tests; Dynamic mechanical properties; Earth and Environmental Science; Earth Sciences; Energy; Failure mechanisms; Fractal geometry; Geophysics/Geodesy; Granite; Impact tests; Mechanical properties; Mica; Microcracks; Muscovite; Original Paper; Pressure; Silica; Silicon dioxide; Split Hopkinson pressure bars; Surface cracks
• ISSN: 0723-2632; 1434-453X
• DOI: 10.1007/s00603-023-03506-w

Understanding the dynamic failure mechanism of rocks subjected to chemical corrosion is very important. However, the previous works mainly focused on static damage rather than dynamic pulverization with chemical corrosion. In this study, Split Hopkinson Pressure Bar (SHPB) impact tests are performed to study the dynamic mechanical properties and energy evolution of granite after chemical corrosion. The XRD and SEM analyses are employed to reveal the chemical reaction processes and corrosion mechanisms. Moreover, the fractal dimension is applied to determine the failure pattern of granite. The experimental results show that the acidic environment causes muscovite, albite, and microcline to generate SiO 2 (quartz), and the newly generated SiO 2 has a weak pressure-bearing capacity. As corrosion progressed, micro-particles accumulate on the surface and cause stress concentrations, which implies a decrease in dynamic properties. Chemical corrosion causes internal microcracks to propagate, and more energy is absorbed when they coalesce under the dynamic impact. The chemical solution enters the inside of specimens through the surface cracks for further reaction, which causes the failure pattern to change from splitting failure to crushing failure. The findings can fill in the gap in the chemical corrosion mechanism of granite subjected to dynamic impact. Highlights Split Hopkinson Pressure Bar tests are performed to study the dynamic mechanical properties of granite after chemical corrosion. The XRD and SEM analyses are employed to reveal the chemical reaction processes and corrosion mechanisms. The acidic environment causes muscovite, albite, and microcline to generate SiO2, and the generated SiO2 has a weak load-bearing capacity. Chemical corrosion causes microcracks to propagate, and more energy is absorbed when they coalesce under the dynamic impact.